Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 1 | /* |
| 2 | * probe-finder.c : C expression to kprobe event converter |
| 3 | * |
| 4 | * Written by Masami Hiramatsu <mhiramat@redhat.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | #include <sys/utsname.h> |
| 23 | #include <sys/types.h> |
| 24 | #include <sys/stat.h> |
| 25 | #include <fcntl.h> |
| 26 | #include <errno.h> |
| 27 | #include <stdio.h> |
| 28 | #include <unistd.h> |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 29 | #include <stdlib.h> |
| 30 | #include <string.h> |
| 31 | #include <stdarg.h> |
Ian Munsie | cd932c5 | 2010-04-20 16:58:32 +1000 | [diff] [blame] | 32 | #include <dwarf-regs.h> |
Masami Hiramatsu | 074fc0e | 2009-10-16 20:08:01 -0400 | [diff] [blame] | 33 | |
Masami Hiramatsu | 124bb83 | 2011-02-04 21:52:11 +0900 | [diff] [blame] | 34 | #include <linux/bitops.h> |
Masami Hiramatsu | 89c69c0 | 2009-10-16 20:08:10 -0400 | [diff] [blame] | 35 | #include "event.h" |
Masami Hiramatsu | a15ad2f | 2014-02-06 05:32:27 +0000 | [diff] [blame] | 36 | #include "dso.h" |
Masami Hiramatsu | 89c69c0 | 2009-10-16 20:08:10 -0400 | [diff] [blame] | 37 | #include "debug.h" |
Masami Hiramatsu | 5a62257 | 2014-02-06 05:32:09 +0000 | [diff] [blame] | 38 | #include "intlist.h" |
Masami Hiramatsu | 074fc0e | 2009-10-16 20:08:01 -0400 | [diff] [blame] | 39 | #include "util.h" |
Chase Douglas | 9ed7e1b | 2010-06-14 15:26:30 -0400 | [diff] [blame] | 40 | #include "symbol.h" |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 41 | #include "probe-finder.h" |
| 42 | |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 43 | /* Kprobe tracer basic type is up to u64 */ |
| 44 | #define MAX_BASIC_TYPE_BITS 64 |
| 45 | |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 46 | /* Dwarf FL wrappers */ |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 47 | static char *debuginfo_path; /* Currently dummy */ |
| 48 | |
| 49 | static const Dwfl_Callbacks offline_callbacks = { |
| 50 | .find_debuginfo = dwfl_standard_find_debuginfo, |
| 51 | .debuginfo_path = &debuginfo_path, |
| 52 | |
| 53 | .section_address = dwfl_offline_section_address, |
| 54 | |
| 55 | /* We use this table for core files too. */ |
| 56 | .find_elf = dwfl_build_id_find_elf, |
| 57 | }; |
| 58 | |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 59 | /* Get a Dwarf from offline image */ |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 60 | static int debuginfo__init_offline_dwarf(struct debuginfo *dbg, |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 61 | const char *path) |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 62 | { |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 63 | int fd; |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 64 | |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 65 | fd = open(path, O_RDONLY); |
| 66 | if (fd < 0) |
| 67 | return fd; |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 68 | |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 69 | dbg->dwfl = dwfl_begin(&offline_callbacks); |
| 70 | if (!dbg->dwfl) |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 71 | goto error; |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 72 | |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 73 | dbg->mod = dwfl_report_offline(dbg->dwfl, "", "", fd); |
| 74 | if (!dbg->mod) |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 75 | goto error; |
| 76 | |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 77 | dbg->dbg = dwfl_module_getdwarf(dbg->mod, &dbg->bias); |
| 78 | if (!dbg->dbg) |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 79 | goto error; |
| 80 | |
| 81 | return 0; |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 82 | error: |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 83 | if (dbg->dwfl) |
| 84 | dwfl_end(dbg->dwfl); |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 85 | else |
| 86 | close(fd); |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 87 | memset(dbg, 0, sizeof(*dbg)); |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 88 | |
| 89 | return -ENOENT; |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 90 | } |
| 91 | |
Masami Hiramatsu | a15ad2f | 2014-02-06 05:32:27 +0000 | [diff] [blame] | 92 | static struct debuginfo *__debuginfo__new(const char *path) |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 93 | { |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 94 | struct debuginfo *dbg = zalloc(sizeof(*dbg)); |
| 95 | if (!dbg) |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 96 | return NULL; |
| 97 | |
Arnaldo Carvalho de Melo | 0466252 | 2013-12-26 17:41:15 -0300 | [diff] [blame] | 98 | if (debuginfo__init_offline_dwarf(dbg, path) < 0) |
| 99 | zfree(&dbg); |
Masami Hiramatsu | a15ad2f | 2014-02-06 05:32:27 +0000 | [diff] [blame] | 100 | if (dbg) |
| 101 | pr_debug("Open Debuginfo file: %s\n", path); |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 102 | return dbg; |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 103 | } |
| 104 | |
Masami Hiramatsu | a15ad2f | 2014-02-06 05:32:27 +0000 | [diff] [blame] | 105 | enum dso_binary_type distro_dwarf_types[] = { |
| 106 | DSO_BINARY_TYPE__FEDORA_DEBUGINFO, |
| 107 | DSO_BINARY_TYPE__UBUNTU_DEBUGINFO, |
| 108 | DSO_BINARY_TYPE__OPENEMBEDDED_DEBUGINFO, |
| 109 | DSO_BINARY_TYPE__BUILDID_DEBUGINFO, |
| 110 | DSO_BINARY_TYPE__NOT_FOUND, |
| 111 | }; |
| 112 | |
| 113 | struct debuginfo *debuginfo__new(const char *path) |
| 114 | { |
| 115 | enum dso_binary_type *type; |
| 116 | char buf[PATH_MAX], nil = '\0'; |
| 117 | struct dso *dso; |
| 118 | struct debuginfo *dinfo = NULL; |
| 119 | |
| 120 | /* Try to open distro debuginfo files */ |
| 121 | dso = dso__new(path); |
| 122 | if (!dso) |
| 123 | goto out; |
| 124 | |
| 125 | for (type = distro_dwarf_types; |
| 126 | !dinfo && *type != DSO_BINARY_TYPE__NOT_FOUND; |
| 127 | type++) { |
| 128 | if (dso__read_binary_type_filename(dso, *type, &nil, |
| 129 | buf, PATH_MAX) < 0) |
| 130 | continue; |
| 131 | dinfo = __debuginfo__new(buf); |
| 132 | } |
| 133 | dso__delete(dso); |
| 134 | |
| 135 | out: |
| 136 | /* if failed to open all distro debuginfo, open given binary */ |
| 137 | return dinfo ? : __debuginfo__new(path); |
| 138 | } |
| 139 | |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 140 | void debuginfo__delete(struct debuginfo *dbg) |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 141 | { |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 142 | if (dbg) { |
| 143 | if (dbg->dwfl) |
| 144 | dwfl_end(dbg->dwfl); |
| 145 | free(dbg); |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 146 | } |
| 147 | } |
| 148 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 149 | /* |
| 150 | * Probe finder related functions |
| 151 | */ |
| 152 | |
Srikar Dronamraju | 0e60836 | 2010-07-29 19:43:51 +0530 | [diff] [blame] | 153 | static struct probe_trace_arg_ref *alloc_trace_arg_ref(long offs) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 154 | { |
Srikar Dronamraju | 0e60836 | 2010-07-29 19:43:51 +0530 | [diff] [blame] | 155 | struct probe_trace_arg_ref *ref; |
| 156 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 157 | if (ref != NULL) |
| 158 | ref->offset = offs; |
| 159 | return ref; |
| 160 | } |
| 161 | |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 162 | /* |
| 163 | * Convert a location into trace_arg. |
| 164 | * If tvar == NULL, this just checks variable can be converted. |
Masami Hiramatsu | 3d918a1 | 2013-10-11 16:10:26 +0900 | [diff] [blame] | 165 | * If fentry == true and vr_die is a parameter, do huristic search |
| 166 | * for the location fuzzed by function entry mcount. |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 167 | */ |
| 168 | static int convert_variable_location(Dwarf_Die *vr_die, Dwarf_Addr addr, |
Masami Hiramatsu | 3d918a1 | 2013-10-11 16:10:26 +0900 | [diff] [blame] | 169 | Dwarf_Op *fb_ops, Dwarf_Die *sp_die, |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 170 | struct probe_trace_arg *tvar) |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 171 | { |
| 172 | Dwarf_Attribute attr; |
Masami Hiramatsu | 3d918a1 | 2013-10-11 16:10:26 +0900 | [diff] [blame] | 173 | Dwarf_Addr tmp = 0; |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 174 | Dwarf_Op *op; |
| 175 | size_t nops; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 176 | unsigned int regn; |
| 177 | Dwarf_Word offs = 0; |
Masami Hiramatsu | 4235b04 | 2010-03-16 18:06:12 -0400 | [diff] [blame] | 178 | bool ref = false; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 179 | const char *regs; |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 180 | int ret; |
| 181 | |
Masami Hiramatsu | 632941c | 2010-10-21 19:13:16 +0900 | [diff] [blame] | 182 | if (dwarf_attr(vr_die, DW_AT_external, &attr) != NULL) |
| 183 | goto static_var; |
| 184 | |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 185 | /* TODO: handle more than 1 exprs */ |
Masami Hiramatsu | 3d918a1 | 2013-10-11 16:10:26 +0900 | [diff] [blame] | 186 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL) |
| 187 | return -EINVAL; /* Broken DIE ? */ |
| 188 | if (dwarf_getlocation_addr(&attr, addr, &op, &nops, 1) <= 0) { |
| 189 | ret = dwarf_entrypc(sp_die, &tmp); |
| 190 | if (ret || addr != tmp || |
| 191 | dwarf_tag(vr_die) != DW_TAG_formal_parameter || |
| 192 | dwarf_highpc(sp_die, &tmp)) |
| 193 | return -ENOENT; |
| 194 | /* |
| 195 | * This is fuzzed by fentry mcount. We try to find the |
| 196 | * parameter location at the earliest address. |
| 197 | */ |
| 198 | for (addr += 1; addr <= tmp; addr++) { |
| 199 | if (dwarf_getlocation_addr(&attr, addr, &op, |
| 200 | &nops, 1) > 0) |
| 201 | goto found; |
| 202 | } |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 203 | return -ENOENT; |
| 204 | } |
Masami Hiramatsu | 3d918a1 | 2013-10-11 16:10:26 +0900 | [diff] [blame] | 205 | found: |
| 206 | if (nops == 0) |
| 207 | /* TODO: Support const_value */ |
| 208 | return -ENOENT; |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 209 | |
| 210 | if (op->atom == DW_OP_addr) { |
Masami Hiramatsu | 632941c | 2010-10-21 19:13:16 +0900 | [diff] [blame] | 211 | static_var: |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 212 | if (!tvar) |
| 213 | return 0; |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 214 | /* Static variables on memory (not stack), make @varname */ |
| 215 | ret = strlen(dwarf_diename(vr_die)); |
| 216 | tvar->value = zalloc(ret + 2); |
| 217 | if (tvar->value == NULL) |
| 218 | return -ENOMEM; |
| 219 | snprintf(tvar->value, ret + 2, "@%s", dwarf_diename(vr_die)); |
| 220 | tvar->ref = alloc_trace_arg_ref((long)offs); |
| 221 | if (tvar->ref == NULL) |
| 222 | return -ENOMEM; |
| 223 | return 0; |
| 224 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 225 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 226 | /* If this is based on frame buffer, set the offset */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 227 | if (op->atom == DW_OP_fbreg) { |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 228 | if (fb_ops == NULL) |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 229 | return -ENOTSUP; |
Masami Hiramatsu | 4235b04 | 2010-03-16 18:06:12 -0400 | [diff] [blame] | 230 | ref = true; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 231 | offs = op->number; |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 232 | op = &fb_ops[0]; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 233 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 234 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 235 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
| 236 | regn = op->atom - DW_OP_breg0; |
| 237 | offs += op->number; |
Masami Hiramatsu | 4235b04 | 2010-03-16 18:06:12 -0400 | [diff] [blame] | 238 | ref = true; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 239 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
| 240 | regn = op->atom - DW_OP_reg0; |
| 241 | } else if (op->atom == DW_OP_bregx) { |
| 242 | regn = op->number; |
| 243 | offs += op->number2; |
Masami Hiramatsu | 4235b04 | 2010-03-16 18:06:12 -0400 | [diff] [blame] | 244 | ref = true; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 245 | } else if (op->atom == DW_OP_regx) { |
| 246 | regn = op->number; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 247 | } else { |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 248 | pr_debug("DW_OP %x is not supported.\n", op->atom); |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 249 | return -ENOTSUP; |
| 250 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 251 | |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 252 | if (!tvar) |
| 253 | return 0; |
| 254 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 255 | regs = get_arch_regstr(regn); |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 256 | if (!regs) { |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 257 | /* This should be a bug in DWARF or this tool */ |
Masami Hiramatsu | 0e43e5d | 2010-12-17 22:12:11 +0900 | [diff] [blame] | 258 | pr_warning("Mapping for the register number %u " |
| 259 | "missing on this architecture.\n", regn); |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 260 | return -ERANGE; |
| 261 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 262 | |
Masami Hiramatsu | 02b95da | 2010-04-12 13:17:56 -0400 | [diff] [blame] | 263 | tvar->value = strdup(regs); |
| 264 | if (tvar->value == NULL) |
| 265 | return -ENOMEM; |
| 266 | |
Masami Hiramatsu | 4235b04 | 2010-03-16 18:06:12 -0400 | [diff] [blame] | 267 | if (ref) { |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 268 | tvar->ref = alloc_trace_arg_ref((long)offs); |
Masami Hiramatsu | e334016f1 | 2010-04-12 13:17:49 -0400 | [diff] [blame] | 269 | if (tvar->ref == NULL) |
| 270 | return -ENOMEM; |
Masami Hiramatsu | 4235b04 | 2010-03-16 18:06:12 -0400 | [diff] [blame] | 271 | } |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 272 | return 0; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 273 | } |
| 274 | |
Masami Hiramatsu | 124bb83 | 2011-02-04 21:52:11 +0900 | [diff] [blame] | 275 | #define BYTES_TO_BITS(nb) ((nb) * BITS_PER_LONG / sizeof(long)) |
| 276 | |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 277 | static int convert_variable_type(Dwarf_Die *vr_die, |
Srikar Dronamraju | 0e60836 | 2010-07-29 19:43:51 +0530 | [diff] [blame] | 278 | struct probe_trace_arg *tvar, |
Masami Hiramatsu | 73317b9 | 2010-05-19 15:57:35 -0400 | [diff] [blame] | 279 | const char *cast) |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 280 | { |
Srikar Dronamraju | 0e60836 | 2010-07-29 19:43:51 +0530 | [diff] [blame] | 281 | struct probe_trace_arg_ref **ref_ptr = &tvar->ref; |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 282 | Dwarf_Die type; |
| 283 | char buf[16]; |
Masami Hiramatsu | 5f03cba | 2014-08-14 02:22:34 +0000 | [diff] [blame] | 284 | char sbuf[STRERR_BUFSIZE]; |
Masami Hiramatsu | bcfc082 | 2011-06-27 16:27:21 +0900 | [diff] [blame] | 285 | int bsize, boffs, total; |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 286 | int ret; |
| 287 | |
Masami Hiramatsu | 73317b9 | 2010-05-19 15:57:35 -0400 | [diff] [blame] | 288 | /* TODO: check all types */ |
| 289 | if (cast && strcmp(cast, "string") != 0) { |
| 290 | /* Non string type is OK */ |
| 291 | tvar->type = strdup(cast); |
| 292 | return (tvar->type == NULL) ? -ENOMEM : 0; |
| 293 | } |
| 294 | |
Masami Hiramatsu | bcfc082 | 2011-06-27 16:27:21 +0900 | [diff] [blame] | 295 | bsize = dwarf_bitsize(vr_die); |
| 296 | if (bsize > 0) { |
Masami Hiramatsu | 124bb83 | 2011-02-04 21:52:11 +0900 | [diff] [blame] | 297 | /* This is a bitfield */ |
Masami Hiramatsu | bcfc082 | 2011-06-27 16:27:21 +0900 | [diff] [blame] | 298 | boffs = dwarf_bitoffset(vr_die); |
| 299 | total = dwarf_bytesize(vr_die); |
| 300 | if (boffs < 0 || total < 0) |
| 301 | return -ENOENT; |
| 302 | ret = snprintf(buf, 16, "b%d@%d/%zd", bsize, boffs, |
| 303 | BYTES_TO_BITS(total)); |
Masami Hiramatsu | 124bb83 | 2011-02-04 21:52:11 +0900 | [diff] [blame] | 304 | goto formatted; |
| 305 | } |
| 306 | |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 307 | if (die_get_real_type(vr_die, &type) == NULL) { |
| 308 | pr_warning("Failed to get a type information of %s.\n", |
| 309 | dwarf_diename(vr_die)); |
| 310 | return -ENOENT; |
| 311 | } |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 312 | |
Masami Hiramatsu | b2a3c12 | 2010-05-19 15:57:42 -0400 | [diff] [blame] | 313 | pr_debug("%s type is %s.\n", |
| 314 | dwarf_diename(vr_die), dwarf_diename(&type)); |
| 315 | |
Masami Hiramatsu | 73317b9 | 2010-05-19 15:57:35 -0400 | [diff] [blame] | 316 | if (cast && strcmp(cast, "string") == 0) { /* String type */ |
| 317 | ret = dwarf_tag(&type); |
| 318 | if (ret != DW_TAG_pointer_type && |
| 319 | ret != DW_TAG_array_type) { |
| 320 | pr_warning("Failed to cast into string: " |
Masami Hiramatsu | 0e43e5d | 2010-12-17 22:12:11 +0900 | [diff] [blame] | 321 | "%s(%s) is not a pointer nor array.\n", |
Masami Hiramatsu | 73317b9 | 2010-05-19 15:57:35 -0400 | [diff] [blame] | 322 | dwarf_diename(vr_die), dwarf_diename(&type)); |
| 323 | return -EINVAL; |
| 324 | } |
Hyeoncheol Lee | 7ce28b5 | 2012-09-11 16:57:28 +0900 | [diff] [blame] | 325 | if (die_get_real_type(&type, &type) == NULL) { |
| 326 | pr_warning("Failed to get a type" |
| 327 | " information.\n"); |
| 328 | return -ENOENT; |
| 329 | } |
Masami Hiramatsu | 73317b9 | 2010-05-19 15:57:35 -0400 | [diff] [blame] | 330 | if (ret == DW_TAG_pointer_type) { |
Masami Hiramatsu | 73317b9 | 2010-05-19 15:57:35 -0400 | [diff] [blame] | 331 | while (*ref_ptr) |
| 332 | ref_ptr = &(*ref_ptr)->next; |
| 333 | /* Add new reference with offset +0 */ |
Srikar Dronamraju | 0e60836 | 2010-07-29 19:43:51 +0530 | [diff] [blame] | 334 | *ref_ptr = zalloc(sizeof(struct probe_trace_arg_ref)); |
Masami Hiramatsu | 73317b9 | 2010-05-19 15:57:35 -0400 | [diff] [blame] | 335 | if (*ref_ptr == NULL) { |
| 336 | pr_warning("Out of memory error\n"); |
| 337 | return -ENOMEM; |
| 338 | } |
| 339 | } |
Masami Hiramatsu | 8217563 | 2010-07-09 18:29:17 +0900 | [diff] [blame] | 340 | if (!die_compare_name(&type, "char") && |
| 341 | !die_compare_name(&type, "unsigned char")) { |
Masami Hiramatsu | 73317b9 | 2010-05-19 15:57:35 -0400 | [diff] [blame] | 342 | pr_warning("Failed to cast into string: " |
Masami Hiramatsu | 0e43e5d | 2010-12-17 22:12:11 +0900 | [diff] [blame] | 343 | "%s is not (unsigned) char *.\n", |
Masami Hiramatsu | 73317b9 | 2010-05-19 15:57:35 -0400 | [diff] [blame] | 344 | dwarf_diename(vr_die)); |
| 345 | return -EINVAL; |
| 346 | } |
| 347 | tvar->type = strdup(cast); |
| 348 | return (tvar->type == NULL) ? -ENOMEM : 0; |
| 349 | } |
| 350 | |
Masami Hiramatsu | bcfc082 | 2011-06-27 16:27:21 +0900 | [diff] [blame] | 351 | ret = dwarf_bytesize(&type); |
| 352 | if (ret <= 0) |
Masami Hiramatsu | 124bb83 | 2011-02-04 21:52:11 +0900 | [diff] [blame] | 353 | /* No size ... try to use default type */ |
| 354 | return 0; |
Masami Hiramatsu | bcfc082 | 2011-06-27 16:27:21 +0900 | [diff] [blame] | 355 | ret = BYTES_TO_BITS(ret); |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 356 | |
Masami Hiramatsu | 124bb83 | 2011-02-04 21:52:11 +0900 | [diff] [blame] | 357 | /* Check the bitwidth */ |
| 358 | if (ret > MAX_BASIC_TYPE_BITS) { |
| 359 | pr_info("%s exceeds max-bitwidth. Cut down to %d bits.\n", |
| 360 | dwarf_diename(&type), MAX_BASIC_TYPE_BITS); |
| 361 | ret = MAX_BASIC_TYPE_BITS; |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 362 | } |
Masami Hiramatsu | 124bb83 | 2011-02-04 21:52:11 +0900 | [diff] [blame] | 363 | ret = snprintf(buf, 16, "%c%d", |
| 364 | die_is_signed_type(&type) ? 's' : 'u', ret); |
| 365 | |
| 366 | formatted: |
| 367 | if (ret < 0 || ret >= 16) { |
| 368 | if (ret >= 16) |
| 369 | ret = -E2BIG; |
| 370 | pr_warning("Failed to convert variable type: %s\n", |
Masami Hiramatsu | 5f03cba | 2014-08-14 02:22:34 +0000 | [diff] [blame] | 371 | strerror_r(-ret, sbuf, sizeof(sbuf))); |
Masami Hiramatsu | 124bb83 | 2011-02-04 21:52:11 +0900 | [diff] [blame] | 372 | return ret; |
| 373 | } |
| 374 | tvar->type = strdup(buf); |
| 375 | if (tvar->type == NULL) |
| 376 | return -ENOMEM; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 377 | return 0; |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 378 | } |
| 379 | |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 380 | static int convert_variable_fields(Dwarf_Die *vr_die, const char *varname, |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 381 | struct perf_probe_arg_field *field, |
Srikar Dronamraju | 0e60836 | 2010-07-29 19:43:51 +0530 | [diff] [blame] | 382 | struct probe_trace_arg_ref **ref_ptr, |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 383 | Dwarf_Die *die_mem) |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 384 | { |
Srikar Dronamraju | 0e60836 | 2010-07-29 19:43:51 +0530 | [diff] [blame] | 385 | struct probe_trace_arg_ref *ref = *ref_ptr; |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 386 | Dwarf_Die type; |
| 387 | Dwarf_Word offs; |
Masami Hiramatsu | b2a3c12 | 2010-05-19 15:57:42 -0400 | [diff] [blame] | 388 | int ret, tag; |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 389 | |
| 390 | pr_debug("converting %s in %s\n", field->name, varname); |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 391 | if (die_get_real_type(vr_die, &type) == NULL) { |
| 392 | pr_warning("Failed to get the type of %s.\n", varname); |
| 393 | return -ENOENT; |
| 394 | } |
Masami Hiramatsu | b2a3c12 | 2010-05-19 15:57:42 -0400 | [diff] [blame] | 395 | pr_debug2("Var real type: (%x)\n", (unsigned)dwarf_dieoffset(&type)); |
| 396 | tag = dwarf_tag(&type); |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 397 | |
Masami Hiramatsu | b2a3c12 | 2010-05-19 15:57:42 -0400 | [diff] [blame] | 398 | if (field->name[0] == '[' && |
| 399 | (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type)) { |
| 400 | if (field->next) |
| 401 | /* Save original type for next field */ |
| 402 | memcpy(die_mem, &type, sizeof(*die_mem)); |
| 403 | /* Get the type of this array */ |
| 404 | if (die_get_real_type(&type, &type) == NULL) { |
| 405 | pr_warning("Failed to get the type of %s.\n", varname); |
| 406 | return -ENOENT; |
| 407 | } |
| 408 | pr_debug2("Array real type: (%x)\n", |
| 409 | (unsigned)dwarf_dieoffset(&type)); |
| 410 | if (tag == DW_TAG_pointer_type) { |
Srikar Dronamraju | 0e60836 | 2010-07-29 19:43:51 +0530 | [diff] [blame] | 411 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
Masami Hiramatsu | b2a3c12 | 2010-05-19 15:57:42 -0400 | [diff] [blame] | 412 | if (ref == NULL) |
| 413 | return -ENOMEM; |
| 414 | if (*ref_ptr) |
| 415 | (*ref_ptr)->next = ref; |
| 416 | else |
| 417 | *ref_ptr = ref; |
| 418 | } |
Masami Hiramatsu | bcfc082 | 2011-06-27 16:27:21 +0900 | [diff] [blame] | 419 | ref->offset += dwarf_bytesize(&type) * field->index; |
Masami Hiramatsu | b2a3c12 | 2010-05-19 15:57:42 -0400 | [diff] [blame] | 420 | if (!field->next) |
| 421 | /* Save vr_die for converting types */ |
| 422 | memcpy(die_mem, vr_die, sizeof(*die_mem)); |
| 423 | goto next; |
| 424 | } else if (tag == DW_TAG_pointer_type) { |
| 425 | /* Check the pointer and dereference */ |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 426 | if (!field->ref) { |
| 427 | pr_err("Semantic error: %s must be referred by '->'\n", |
| 428 | field->name); |
| 429 | return -EINVAL; |
| 430 | } |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 431 | /* Get the type pointed by this pointer */ |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 432 | if (die_get_real_type(&type, &type) == NULL) { |
| 433 | pr_warning("Failed to get the type of %s.\n", varname); |
| 434 | return -ENOENT; |
| 435 | } |
Masami Hiramatsu | 12e5a7a | 2010-04-02 12:50:53 -0400 | [diff] [blame] | 436 | /* Verify it is a data structure */ |
Hyeoncheol Lee | 7b0295b | 2012-09-12 16:57:45 +0900 | [diff] [blame] | 437 | tag = dwarf_tag(&type); |
| 438 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { |
| 439 | pr_warning("%s is not a data structure nor an union.\n", |
| 440 | varname); |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 441 | return -EINVAL; |
| 442 | } |
Masami Hiramatsu | 12e5a7a | 2010-04-02 12:50:53 -0400 | [diff] [blame] | 443 | |
Srikar Dronamraju | 0e60836 | 2010-07-29 19:43:51 +0530 | [diff] [blame] | 444 | ref = zalloc(sizeof(struct probe_trace_arg_ref)); |
Masami Hiramatsu | e334016f1 | 2010-04-12 13:17:49 -0400 | [diff] [blame] | 445 | if (ref == NULL) |
| 446 | return -ENOMEM; |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 447 | if (*ref_ptr) |
| 448 | (*ref_ptr)->next = ref; |
| 449 | else |
| 450 | *ref_ptr = ref; |
| 451 | } else { |
Masami Hiramatsu | 12e5a7a | 2010-04-02 12:50:53 -0400 | [diff] [blame] | 452 | /* Verify it is a data structure */ |
Hyeoncheol Lee | 7b0295b | 2012-09-12 16:57:45 +0900 | [diff] [blame] | 453 | if (tag != DW_TAG_structure_type && tag != DW_TAG_union_type) { |
| 454 | pr_warning("%s is not a data structure nor an union.\n", |
| 455 | varname); |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 456 | return -EINVAL; |
| 457 | } |
Masami Hiramatsu | b2a3c12 | 2010-05-19 15:57:42 -0400 | [diff] [blame] | 458 | if (field->name[0] == '[') { |
Masami Hiramatsu | 0e43e5d | 2010-12-17 22:12:11 +0900 | [diff] [blame] | 459 | pr_err("Semantic error: %s is not a pointor" |
| 460 | " nor array.\n", varname); |
Masami Hiramatsu | b2a3c12 | 2010-05-19 15:57:42 -0400 | [diff] [blame] | 461 | return -EINVAL; |
| 462 | } |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 463 | if (field->ref) { |
| 464 | pr_err("Semantic error: %s must be referred by '.'\n", |
| 465 | field->name); |
| 466 | return -EINVAL; |
| 467 | } |
| 468 | if (!ref) { |
| 469 | pr_warning("Structure on a register is not " |
| 470 | "supported yet.\n"); |
| 471 | return -ENOTSUP; |
| 472 | } |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 473 | } |
| 474 | |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 475 | if (die_find_member(&type, field->name, die_mem) == NULL) { |
Arnaldo Carvalho de Melo | 9ef0438 | 2013-10-24 17:36:31 -0300 | [diff] [blame] | 476 | pr_warning("%s(type:%s) has no member %s.\n", varname, |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 477 | dwarf_diename(&type), field->name); |
| 478 | return -EINVAL; |
| 479 | } |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 480 | |
| 481 | /* Get the offset of the field */ |
Hyeoncheol Lee | 7b0295b | 2012-09-12 16:57:45 +0900 | [diff] [blame] | 482 | if (tag == DW_TAG_union_type) { |
| 483 | offs = 0; |
| 484 | } else { |
| 485 | ret = die_get_data_member_location(die_mem, &offs); |
| 486 | if (ret < 0) { |
| 487 | pr_warning("Failed to get the offset of %s.\n", |
| 488 | field->name); |
| 489 | return ret; |
| 490 | } |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 491 | } |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 492 | ref->offset += (long)offs; |
| 493 | |
Masami Hiramatsu | b2a3c12 | 2010-05-19 15:57:42 -0400 | [diff] [blame] | 494 | next: |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 495 | /* Converting next field */ |
| 496 | if (field->next) |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 497 | return convert_variable_fields(die_mem, field->name, |
Masami Hiramatsu | de1439d | 2010-04-14 17:44:00 -0300 | [diff] [blame] | 498 | field->next, &ref, die_mem); |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 499 | else |
| 500 | return 0; |
Masami Hiramatsu | 7df2f32 | 2010-03-16 18:06:26 -0400 | [diff] [blame] | 501 | } |
| 502 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 503 | /* Show a variables in kprobe event format */ |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 504 | static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 505 | { |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 506 | Dwarf_Die die_mem; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 507 | int ret; |
| 508 | |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 509 | pr_debug("Converting variable %s into trace event.\n", |
| 510 | dwarf_diename(vr_die)); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 511 | |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 512 | ret = convert_variable_location(vr_die, pf->addr, pf->fb_ops, |
Masami Hiramatsu | 3d918a1 | 2013-10-11 16:10:26 +0900 | [diff] [blame] | 513 | &pf->sp_die, pf->tvar); |
Masami Hiramatsu | 0c188a0 | 2014-05-29 19:52:32 +0900 | [diff] [blame] | 514 | if (ret == -ENOENT || ret == -EINVAL) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 515 | pr_err("Failed to find the location of %s at this address.\n" |
| 516 | " Perhaps, it has been optimized out.\n", pf->pvar->var); |
| 517 | else if (ret == -ENOTSUP) |
| 518 | pr_err("Sorry, we don't support this variable location yet.\n"); |
Masami Hiramatsu | 0c188a0 | 2014-05-29 19:52:32 +0900 | [diff] [blame] | 519 | else if (ret == 0 && pf->pvar->field) { |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 520 | ret = convert_variable_fields(vr_die, pf->pvar->var, |
| 521 | pf->pvar->field, &pf->tvar->ref, |
| 522 | &die_mem); |
Masami Hiramatsu | 4984912 | 2010-04-12 13:17:15 -0400 | [diff] [blame] | 523 | vr_die = &die_mem; |
| 524 | } |
Masami Hiramatsu | 73317b9 | 2010-05-19 15:57:35 -0400 | [diff] [blame] | 525 | if (ret == 0) |
| 526 | ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 527 | /* *expr will be cached in libdw. Don't free it. */ |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 528 | return ret; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 529 | } |
| 530 | |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 531 | /* Find a variable in a scope DIE */ |
| 532 | static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 533 | { |
Masami Hiramatsu | f182e3e | 2011-08-11 20:03:05 +0900 | [diff] [blame] | 534 | Dwarf_Die vr_die; |
Masami Hiramatsu | 11a1ca3 | 2010-04-12 13:17:22 -0400 | [diff] [blame] | 535 | char buf[32], *ptr; |
Masami Hiramatsu | f182e3e | 2011-08-11 20:03:05 +0900 | [diff] [blame] | 536 | int ret = 0; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 537 | |
Masami Hiramatsu | 367e94c | 2010-08-27 20:38:59 +0900 | [diff] [blame] | 538 | if (!is_c_varname(pf->pvar->var)) { |
| 539 | /* Copy raw parameters */ |
| 540 | pf->tvar->value = strdup(pf->pvar->var); |
| 541 | if (pf->tvar->value == NULL) |
| 542 | return -ENOMEM; |
| 543 | if (pf->pvar->type) { |
| 544 | pf->tvar->type = strdup(pf->pvar->type); |
| 545 | if (pf->tvar->type == NULL) |
| 546 | return -ENOMEM; |
| 547 | } |
| 548 | if (pf->pvar->name) { |
| 549 | pf->tvar->name = strdup(pf->pvar->name); |
| 550 | if (pf->tvar->name == NULL) |
| 551 | return -ENOMEM; |
| 552 | } else |
| 553 | pf->tvar->name = NULL; |
| 554 | return 0; |
| 555 | } |
| 556 | |
Masami Hiramatsu | 4848193 | 2010-04-12 13:16:53 -0400 | [diff] [blame] | 557 | if (pf->pvar->name) |
Masami Hiramatsu | 02b95da | 2010-04-12 13:17:56 -0400 | [diff] [blame] | 558 | pf->tvar->name = strdup(pf->pvar->name); |
Masami Hiramatsu | 4848193 | 2010-04-12 13:16:53 -0400 | [diff] [blame] | 559 | else { |
Masami Hiramatsu | 02b95da | 2010-04-12 13:17:56 -0400 | [diff] [blame] | 560 | ret = synthesize_perf_probe_arg(pf->pvar, buf, 32); |
| 561 | if (ret < 0) |
| 562 | return ret; |
Masami Hiramatsu | 11a1ca3 | 2010-04-12 13:17:22 -0400 | [diff] [blame] | 563 | ptr = strchr(buf, ':'); /* Change type separator to _ */ |
| 564 | if (ptr) |
| 565 | *ptr = '_'; |
Masami Hiramatsu | 02b95da | 2010-04-12 13:17:56 -0400 | [diff] [blame] | 566 | pf->tvar->name = strdup(buf); |
Masami Hiramatsu | 4848193 | 2010-04-12 13:16:53 -0400 | [diff] [blame] | 567 | } |
Masami Hiramatsu | 02b95da | 2010-04-12 13:17:56 -0400 | [diff] [blame] | 568 | if (pf->tvar->name == NULL) |
| 569 | return -ENOMEM; |
Masami Hiramatsu | 4848193 | 2010-04-12 13:16:53 -0400 | [diff] [blame] | 570 | |
Masami Hiramatsu | f182e3e | 2011-08-11 20:03:05 +0900 | [diff] [blame] | 571 | pr_debug("Searching '%s' variable in context.\n", pf->pvar->var); |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 572 | /* Search child die for local variables and parameters. */ |
Masami Hiramatsu | f182e3e | 2011-08-11 20:03:05 +0900 | [diff] [blame] | 573 | if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) { |
| 574 | /* Search again in global variables */ |
| 575 | if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die)) |
Masami Hiramatsu | 36d789a | 2014-06-06 07:13:45 +0000 | [diff] [blame] | 576 | pr_warning("Failed to find '%s' in this function.\n", |
| 577 | pf->pvar->var); |
Masami Hiramatsu | f182e3e | 2011-08-11 20:03:05 +0900 | [diff] [blame] | 578 | ret = -ENOENT; |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 579 | } |
Masami Hiramatsu | f66fedc | 2011-08-20 14:39:23 +0900 | [diff] [blame] | 580 | if (ret >= 0) |
Masami Hiramatsu | f182e3e | 2011-08-11 20:03:05 +0900 | [diff] [blame] | 581 | ret = convert_variable(&vr_die, pf); |
| 582 | |
Masami Hiramatsu | b7dcb85 | 2010-05-19 15:57:49 -0400 | [diff] [blame] | 583 | return ret; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 584 | } |
| 585 | |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 586 | /* Convert subprogram DIE to trace point */ |
Masami Hiramatsu | 576b523 | 2013-09-25 22:16:16 +0900 | [diff] [blame] | 587 | static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, |
| 588 | Dwarf_Addr paddr, bool retprobe, |
| 589 | struct probe_trace_point *tp) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 590 | { |
Prashanth Nageshappa | 26b7952 | 2012-02-24 13:11:39 +0530 | [diff] [blame] | 591 | Dwarf_Addr eaddr, highaddr; |
Masami Hiramatsu | 576b523 | 2013-09-25 22:16:16 +0900 | [diff] [blame] | 592 | GElf_Sym sym; |
| 593 | const char *symbol; |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 594 | |
Masami Hiramatsu | 576b523 | 2013-09-25 22:16:16 +0900 | [diff] [blame] | 595 | /* Verify the address is correct */ |
| 596 | if (dwarf_entrypc(sp_die, &eaddr) != 0) { |
| 597 | pr_warning("Failed to get entry address of %s\n", |
| 598 | dwarf_diename(sp_die)); |
| 599 | return -ENOENT; |
| 600 | } |
| 601 | if (dwarf_highpc(sp_die, &highaddr) != 0) { |
| 602 | pr_warning("Failed to get end address of %s\n", |
| 603 | dwarf_diename(sp_die)); |
| 604 | return -ENOENT; |
| 605 | } |
| 606 | if (paddr > highaddr) { |
| 607 | pr_warning("Offset specified is greater than size of %s\n", |
| 608 | dwarf_diename(sp_die)); |
| 609 | return -EINVAL; |
| 610 | } |
| 611 | |
Masami Hiramatsu | 664fee3 | 2014-09-17 08:41:01 +0000 | [diff] [blame] | 612 | symbol = dwarf_diename(sp_die); |
Masami Hiramatsu | 576b523 | 2013-09-25 22:16:16 +0900 | [diff] [blame] | 613 | if (!symbol) { |
Masami Hiramatsu | 664fee3 | 2014-09-17 08:41:01 +0000 | [diff] [blame] | 614 | /* Try to get the symbol name from symtab */ |
| 615 | symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); |
| 616 | if (!symbol) { |
| 617 | pr_warning("Failed to find symbol at 0x%lx\n", |
| 618 | (unsigned long)paddr); |
| 619 | return -ENOENT; |
| 620 | } |
| 621 | eaddr = sym.st_value; |
Masami Hiramatsu | 576b523 | 2013-09-25 22:16:16 +0900 | [diff] [blame] | 622 | } |
Masami Hiramatsu | 664fee3 | 2014-09-17 08:41:01 +0000 | [diff] [blame] | 623 | tp->offset = (unsigned long)(paddr - eaddr); |
Masami Hiramatsu | fb7345b | 2013-12-26 05:41:53 +0000 | [diff] [blame] | 624 | tp->address = (unsigned long)paddr; |
Masami Hiramatsu | 576b523 | 2013-09-25 22:16:16 +0900 | [diff] [blame] | 625 | tp->symbol = strdup(symbol); |
| 626 | if (!tp->symbol) |
| 627 | return -ENOMEM; |
Masami Hiramatsu | 4235b04 | 2010-03-16 18:06:12 -0400 | [diff] [blame] | 628 | |
Masami Hiramatsu | 04ddd04 | 2010-08-27 20:38:53 +0900 | [diff] [blame] | 629 | /* Return probe must be on the head of a subprogram */ |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 630 | if (retprobe) { |
| 631 | if (eaddr != paddr) { |
Masami Hiramatsu | 04ddd04 | 2010-08-27 20:38:53 +0900 | [diff] [blame] | 632 | pr_warning("Return probe must be on the head of" |
Masami Hiramatsu | 0e43e5d | 2010-12-17 22:12:11 +0900 | [diff] [blame] | 633 | " a real function.\n"); |
Masami Hiramatsu | 04ddd04 | 2010-08-27 20:38:53 +0900 | [diff] [blame] | 634 | return -EINVAL; |
| 635 | } |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 636 | tp->retprobe = true; |
Masami Hiramatsu | 04ddd04 | 2010-08-27 20:38:53 +0900 | [diff] [blame] | 637 | } |
| 638 | |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 639 | return 0; |
| 640 | } |
| 641 | |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 642 | /* Call probe_finder callback with scope DIE */ |
| 643 | static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 644 | { |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 645 | Dwarf_Attribute fb_attr; |
| 646 | size_t nops; |
| 647 | int ret; |
| 648 | |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 649 | if (!sc_die) { |
| 650 | pr_err("Caller must pass a scope DIE. Program error.\n"); |
| 651 | return -EINVAL; |
| 652 | } |
| 653 | |
| 654 | /* If not a real subprogram, find a real one */ |
Masami Hiramatsu | 0dbb1ca | 2012-04-23 12:24:36 +0900 | [diff] [blame] | 655 | if (!die_is_func_def(sc_die)) { |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 656 | if (!die_find_realfunc(&pf->cu_die, pf->addr, &pf->sp_die)) { |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 657 | pr_warning("Failed to find probe point in any " |
| 658 | "functions.\n"); |
| 659 | return -ENOENT; |
| 660 | } |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 661 | } else |
| 662 | memcpy(&pf->sp_die, sc_die, sizeof(Dwarf_Die)); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 663 | |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 664 | /* Get the frame base attribute/ops from subprogram */ |
| 665 | dwarf_attr(&pf->sp_die, DW_AT_frame_base, &fb_attr); |
Masami Hiramatsu | d0cb426 | 2010-03-15 13:02:35 -0400 | [diff] [blame] | 666 | ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1); |
Masami Hiramatsu | a34a985 | 2010-04-12 13:17:29 -0400 | [diff] [blame] | 667 | if (ret <= 0 || nops == 0) { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 668 | pf->fb_ops = NULL; |
Masami Hiramatsu | 7752f1b | 2010-05-10 13:12:07 -0400 | [diff] [blame] | 669 | #if _ELFUTILS_PREREQ(0, 142) |
Masami Hiramatsu | a34a985 | 2010-04-12 13:17:29 -0400 | [diff] [blame] | 670 | } else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa && |
| 671 | pf->cfi != NULL) { |
| 672 | Dwarf_Frame *frame; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 673 | if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 || |
| 674 | dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) { |
Masami Hiramatsu | 0e43e5d | 2010-12-17 22:12:11 +0900 | [diff] [blame] | 675 | pr_warning("Failed to get call frame on 0x%jx\n", |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 676 | (uintmax_t)pf->addr); |
| 677 | return -ENOENT; |
| 678 | } |
Masami Hiramatsu | 7752f1b | 2010-05-10 13:12:07 -0400 | [diff] [blame] | 679 | #endif |
Masami Hiramatsu | a34a985 | 2010-04-12 13:17:29 -0400 | [diff] [blame] | 680 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 681 | |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 682 | /* Call finder's callback handler */ |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 683 | ret = pf->callback(sc_die, pf); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 684 | |
| 685 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ |
| 686 | pf->fb_ops = NULL; |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 687 | |
| 688 | return ret; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 689 | } |
| 690 | |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 691 | struct find_scope_param { |
| 692 | const char *function; |
| 693 | const char *file; |
| 694 | int line; |
| 695 | int diff; |
| 696 | Dwarf_Die *die_mem; |
| 697 | bool found; |
| 698 | }; |
| 699 | |
| 700 | static int find_best_scope_cb(Dwarf_Die *fn_die, void *data) |
| 701 | { |
| 702 | struct find_scope_param *fsp = data; |
| 703 | const char *file; |
| 704 | int lno; |
| 705 | |
| 706 | /* Skip if declared file name does not match */ |
| 707 | if (fsp->file) { |
| 708 | file = dwarf_decl_file(fn_die); |
| 709 | if (!file || strcmp(fsp->file, file) != 0) |
| 710 | return 0; |
| 711 | } |
| 712 | /* If the function name is given, that's what user expects */ |
| 713 | if (fsp->function) { |
| 714 | if (die_compare_name(fn_die, fsp->function)) { |
| 715 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); |
| 716 | fsp->found = true; |
| 717 | return 1; |
| 718 | } |
| 719 | } else { |
| 720 | /* With the line number, find the nearest declared DIE */ |
| 721 | dwarf_decl_line(fn_die, &lno); |
| 722 | if (lno < fsp->line && fsp->diff > fsp->line - lno) { |
| 723 | /* Keep a candidate and continue */ |
| 724 | fsp->diff = fsp->line - lno; |
| 725 | memcpy(fsp->die_mem, fn_die, sizeof(Dwarf_Die)); |
| 726 | fsp->found = true; |
| 727 | } |
| 728 | } |
| 729 | return 0; |
| 730 | } |
| 731 | |
| 732 | /* Find an appropriate scope fits to given conditions */ |
| 733 | static Dwarf_Die *find_best_scope(struct probe_finder *pf, Dwarf_Die *die_mem) |
| 734 | { |
| 735 | struct find_scope_param fsp = { |
| 736 | .function = pf->pev->point.function, |
| 737 | .file = pf->fname, |
| 738 | .line = pf->lno, |
| 739 | .diff = INT_MAX, |
| 740 | .die_mem = die_mem, |
| 741 | .found = false, |
| 742 | }; |
| 743 | |
| 744 | cu_walk_functions_at(&pf->cu_die, pf->addr, find_best_scope_cb, &fsp); |
| 745 | |
| 746 | return fsp.found ? die_mem : NULL; |
| 747 | } |
| 748 | |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 749 | static int probe_point_line_walker(const char *fname, int lineno, |
| 750 | Dwarf_Addr addr, void *data) |
| 751 | { |
| 752 | struct probe_finder *pf = data; |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 753 | Dwarf_Die *sc_die, die_mem; |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 754 | int ret; |
| 755 | |
| 756 | if (lineno != pf->lno || strtailcmp(fname, pf->fname) != 0) |
| 757 | return 0; |
| 758 | |
| 759 | pf->addr = addr; |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 760 | sc_die = find_best_scope(pf, &die_mem); |
| 761 | if (!sc_die) { |
| 762 | pr_warning("Failed to find scope of probe point.\n"); |
| 763 | return -ENOENT; |
| 764 | } |
| 765 | |
| 766 | ret = call_probe_finder(sc_die, pf); |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 767 | |
| 768 | /* Continue if no error, because the line will be in inline function */ |
Arnaldo Carvalho de Melo | fbee632 | 2011-02-21 13:23:57 -0300 | [diff] [blame] | 769 | return ret < 0 ? ret : 0; |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 770 | } |
| 771 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 772 | /* Find probe point from its line number */ |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 773 | static int find_probe_point_by_line(struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 774 | { |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 775 | return die_walk_lines(&pf->cu_die, probe_point_line_walker, pf); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 776 | } |
| 777 | |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 778 | /* Find lines which match lazy pattern */ |
Masami Hiramatsu | 5a62257 | 2014-02-06 05:32:09 +0000 | [diff] [blame] | 779 | static int find_lazy_match_lines(struct intlist *list, |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 780 | const char *fname, const char *pat) |
| 781 | { |
Franck Bui-Huu | f50c216 | 2011-01-13 11:18:30 +0100 | [diff] [blame] | 782 | FILE *fp; |
| 783 | char *line = NULL; |
| 784 | size_t line_len; |
| 785 | ssize_t len; |
| 786 | int count = 0, linenum = 1; |
Masami Hiramatsu | 5f03cba | 2014-08-14 02:22:34 +0000 | [diff] [blame] | 787 | char sbuf[STRERR_BUFSIZE]; |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 788 | |
Franck Bui-Huu | f50c216 | 2011-01-13 11:18:30 +0100 | [diff] [blame] | 789 | fp = fopen(fname, "r"); |
| 790 | if (!fp) { |
Masami Hiramatsu | 5f03cba | 2014-08-14 02:22:34 +0000 | [diff] [blame] | 791 | pr_warning("Failed to open %s: %s\n", fname, |
| 792 | strerror_r(errno, sbuf, sizeof(sbuf))); |
Arnaldo Carvalho de Melo | b448c4b | 2010-05-18 23:04:28 -0300 | [diff] [blame] | 793 | return -errno; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 794 | } |
| 795 | |
Franck Bui-Huu | f50c216 | 2011-01-13 11:18:30 +0100 | [diff] [blame] | 796 | while ((len = getline(&line, &line_len, fp)) > 0) { |
| 797 | |
| 798 | if (line[len - 1] == '\n') |
| 799 | line[len - 1] = '\0'; |
| 800 | |
| 801 | if (strlazymatch(line, pat)) { |
Masami Hiramatsu | 5a62257 | 2014-02-06 05:32:09 +0000 | [diff] [blame] | 802 | intlist__add(list, linenum); |
Franck Bui-Huu | f50c216 | 2011-01-13 11:18:30 +0100 | [diff] [blame] | 803 | count++; |
| 804 | } |
| 805 | linenum++; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 806 | } |
Arnaldo Carvalho de Melo | b448c4b | 2010-05-18 23:04:28 -0300 | [diff] [blame] | 807 | |
Franck Bui-Huu | f50c216 | 2011-01-13 11:18:30 +0100 | [diff] [blame] | 808 | if (ferror(fp)) |
| 809 | count = -errno; |
| 810 | free(line); |
| 811 | fclose(fp); |
| 812 | |
| 813 | if (count == 0) |
| 814 | pr_debug("No matched lines found in %s.\n", fname); |
| 815 | return count; |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 816 | } |
| 817 | |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 818 | static int probe_point_lazy_walker(const char *fname, int lineno, |
| 819 | Dwarf_Addr addr, void *data) |
| 820 | { |
| 821 | struct probe_finder *pf = data; |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 822 | Dwarf_Die *sc_die, die_mem; |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 823 | int ret; |
| 824 | |
Masami Hiramatsu | 5a62257 | 2014-02-06 05:32:09 +0000 | [diff] [blame] | 825 | if (!intlist__has_entry(pf->lcache, lineno) || |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 826 | strtailcmp(fname, pf->fname) != 0) |
| 827 | return 0; |
| 828 | |
| 829 | pr_debug("Probe line found: line:%d addr:0x%llx\n", |
| 830 | lineno, (unsigned long long)addr); |
| 831 | pf->addr = addr; |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 832 | pf->lno = lineno; |
| 833 | sc_die = find_best_scope(pf, &die_mem); |
| 834 | if (!sc_die) { |
| 835 | pr_warning("Failed to find scope of probe point.\n"); |
| 836 | return -ENOENT; |
| 837 | } |
| 838 | |
| 839 | ret = call_probe_finder(sc_die, pf); |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 840 | |
| 841 | /* |
| 842 | * Continue if no error, because the lazy pattern will match |
| 843 | * to other lines |
| 844 | */ |
Ingo Molnar | 5e814dd5 | 2011-03-15 20:51:09 +0100 | [diff] [blame] | 845 | return ret < 0 ? ret : 0; |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 846 | } |
| 847 | |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 848 | /* Find probe points from lazy pattern */ |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 849 | static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf) |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 850 | { |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 851 | int ret = 0; |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 852 | |
Masami Hiramatsu | 5a62257 | 2014-02-06 05:32:09 +0000 | [diff] [blame] | 853 | if (intlist__empty(pf->lcache)) { |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 854 | /* Matching lazy line pattern */ |
Masami Hiramatsu | 5a62257 | 2014-02-06 05:32:09 +0000 | [diff] [blame] | 855 | ret = find_lazy_match_lines(pf->lcache, pf->fname, |
Masami Hiramatsu | 4235b04 | 2010-03-16 18:06:12 -0400 | [diff] [blame] | 856 | pf->pev->point.lazy_line); |
Franck Bui-Huu | f50c216 | 2011-01-13 11:18:30 +0100 | [diff] [blame] | 857 | if (ret <= 0) |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 858 | return ret; |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 859 | } |
| 860 | |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 861 | return die_walk_lines(sp_die, probe_point_lazy_walker, pf); |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 862 | } |
| 863 | |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 864 | static int probe_point_inline_cb(Dwarf_Die *in_die, void *data) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 865 | { |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 866 | struct probe_finder *pf = data; |
Masami Hiramatsu | 4235b04 | 2010-03-16 18:06:12 -0400 | [diff] [blame] | 867 | struct perf_probe_point *pp = &pf->pev->point; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 868 | Dwarf_Addr addr; |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 869 | int ret; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 870 | |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 871 | if (pp->lazy_line) |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 872 | ret = find_probe_point_lazy(in_die, pf); |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 873 | else { |
| 874 | /* Get probe address */ |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 875 | if (dwarf_entrypc(in_die, &addr) != 0) { |
Masami Hiramatsu | 0e43e5d | 2010-12-17 22:12:11 +0900 | [diff] [blame] | 876 | pr_warning("Failed to get entry address of %s.\n", |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 877 | dwarf_diename(in_die)); |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 878 | return -ENOENT; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 879 | } |
| 880 | pf->addr = addr; |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 881 | pf->addr += pp->offset; |
| 882 | pr_debug("found inline addr: 0x%jx\n", |
| 883 | (uintmax_t)pf->addr); |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 884 | |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 885 | ret = call_probe_finder(in_die, pf); |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 886 | } |
| 887 | |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 888 | return ret; |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 889 | } |
| 890 | |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 891 | /* Callback parameter with return value for libdw */ |
| 892 | struct dwarf_callback_param { |
| 893 | void *data; |
| 894 | int retval; |
| 895 | }; |
| 896 | |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 897 | /* Search function from function name */ |
| 898 | static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) |
| 899 | { |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 900 | struct dwarf_callback_param *param = data; |
| 901 | struct probe_finder *pf = param->data; |
Masami Hiramatsu | 4235b04 | 2010-03-16 18:06:12 -0400 | [diff] [blame] | 902 | struct perf_probe_point *pp = &pf->pev->point; |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 903 | |
| 904 | /* Check tag and diename */ |
Masami Hiramatsu | 0dbb1ca | 2012-04-23 12:24:36 +0900 | [diff] [blame] | 905 | if (!die_is_func_def(sp_die) || |
| 906 | !die_compare_name(sp_die, pp->function)) |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 907 | return DWARF_CB_OK; |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 908 | |
Masami Hiramatsu | 7d21635 | 2011-03-30 18:25:41 +0900 | [diff] [blame] | 909 | /* Check declared file */ |
| 910 | if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die))) |
| 911 | return DWARF_CB_OK; |
| 912 | |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 913 | pf->fname = dwarf_decl_file(sp_die); |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 914 | if (pp->line) { /* Function relative line */ |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 915 | dwarf_decl_line(sp_die, &pf->lno); |
| 916 | pf->lno += pp->line; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 917 | param->retval = find_probe_point_by_line(pf); |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 918 | } else if (!dwarf_func_inline(sp_die)) { |
| 919 | /* Real function */ |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 920 | if (pp->lazy_line) |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 921 | param->retval = find_probe_point_lazy(sp_die, pf); |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 922 | else { |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 923 | if (dwarf_entrypc(sp_die, &pf->addr) != 0) { |
Masami Hiramatsu | 0e43e5d | 2010-12-17 22:12:11 +0900 | [diff] [blame] | 924 | pr_warning("Failed to get entry address of " |
| 925 | "%s.\n", dwarf_diename(sp_die)); |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 926 | param->retval = -ENOENT; |
| 927 | return DWARF_CB_ABORT; |
| 928 | } |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 929 | pf->addr += pp->offset; |
| 930 | /* TODO: Check the address in this function */ |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 931 | param->retval = call_probe_finder(sp_die, pf); |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 932 | } |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 933 | } else |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 934 | /* Inlined function: search instances */ |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 935 | param->retval = die_walk_instances(sp_die, |
| 936 | probe_point_inline_cb, (void *)pf); |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 937 | |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 938 | return DWARF_CB_ABORT; /* Exit; no same symbol in this CU. */ |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 939 | } |
| 940 | |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 941 | static int find_probe_point_by_func(struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 942 | { |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 943 | struct dwarf_callback_param _param = {.data = (void *)pf, |
| 944 | .retval = 0}; |
| 945 | dwarf_getfuncs(&pf->cu_die, probe_point_search_cb, &_param, 0); |
| 946 | return _param.retval; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 947 | } |
| 948 | |
Lin Ming | cd25f8b | 2011-03-25 16:27:48 +0800 | [diff] [blame] | 949 | struct pubname_callback_param { |
| 950 | char *function; |
| 951 | char *file; |
| 952 | Dwarf_Die *cu_die; |
| 953 | Dwarf_Die *sp_die; |
| 954 | int found; |
| 955 | }; |
| 956 | |
| 957 | static int pubname_search_cb(Dwarf *dbg, Dwarf_Global *gl, void *data) |
| 958 | { |
| 959 | struct pubname_callback_param *param = data; |
| 960 | |
| 961 | if (dwarf_offdie(dbg, gl->die_offset, param->sp_die)) { |
| 962 | if (dwarf_tag(param->sp_die) != DW_TAG_subprogram) |
| 963 | return DWARF_CB_OK; |
| 964 | |
| 965 | if (die_compare_name(param->sp_die, param->function)) { |
| 966 | if (!dwarf_offdie(dbg, gl->cu_offset, param->cu_die)) |
| 967 | return DWARF_CB_OK; |
| 968 | |
| 969 | if (param->file && |
| 970 | strtailcmp(param->file, dwarf_decl_file(param->sp_die))) |
| 971 | return DWARF_CB_OK; |
| 972 | |
| 973 | param->found = 1; |
| 974 | return DWARF_CB_ABORT; |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | return DWARF_CB_OK; |
| 979 | } |
| 980 | |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 981 | /* Find probe points from debuginfo */ |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 982 | static int debuginfo__find_probes(struct debuginfo *dbg, |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 983 | struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 984 | { |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 985 | struct perf_probe_point *pp = &pf->pev->point; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 986 | Dwarf_Off off, noff; |
| 987 | size_t cuhl; |
| 988 | Dwarf_Die *diep; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 989 | int ret = 0; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 990 | |
Masami Hiramatsu | 7752f1b | 2010-05-10 13:12:07 -0400 | [diff] [blame] | 991 | #if _ELFUTILS_PREREQ(0, 142) |
Masami Hiramatsu | a34a985 | 2010-04-12 13:17:29 -0400 | [diff] [blame] | 992 | /* Get the call frame information from this dwarf */ |
Namhyung Kim | 03d8941 | 2014-04-07 16:05:48 +0900 | [diff] [blame] | 993 | pf->cfi = dwarf_getcfi_elf(dwarf_getelf(dbg->dbg)); |
Masami Hiramatsu | 7752f1b | 2010-05-10 13:12:07 -0400 | [diff] [blame] | 994 | #endif |
Masami Hiramatsu | a34a985 | 2010-04-12 13:17:29 -0400 | [diff] [blame] | 995 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 996 | off = 0; |
Masami Hiramatsu | 5a62257 | 2014-02-06 05:32:09 +0000 | [diff] [blame] | 997 | pf->lcache = intlist__new(NULL); |
| 998 | if (!pf->lcache) |
| 999 | return -ENOMEM; |
Lin Ming | cd25f8b | 2011-03-25 16:27:48 +0800 | [diff] [blame] | 1000 | |
| 1001 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
| 1002 | if (pp->function) { |
| 1003 | struct pubname_callback_param pubname_param = { |
| 1004 | .function = pp->function, |
| 1005 | .file = pp->file, |
| 1006 | .cu_die = &pf->cu_die, |
| 1007 | .sp_die = &pf->sp_die, |
Lin Ming | 2b348a7 | 2011-04-29 08:41:57 +0000 | [diff] [blame] | 1008 | .found = 0, |
Lin Ming | cd25f8b | 2011-03-25 16:27:48 +0800 | [diff] [blame] | 1009 | }; |
| 1010 | struct dwarf_callback_param probe_param = { |
| 1011 | .data = pf, |
| 1012 | }; |
| 1013 | |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1014 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 1015 | &pubname_param, 0); |
Lin Ming | cd25f8b | 2011-03-25 16:27:48 +0800 | [diff] [blame] | 1016 | if (pubname_param.found) { |
| 1017 | ret = probe_point_search_cb(&pf->sp_die, &probe_param); |
| 1018 | if (ret) |
| 1019 | goto found; |
| 1020 | } |
| 1021 | } |
| 1022 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1023 | /* Loop on CUs (Compilation Unit) */ |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1024 | while (!dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 1025 | /* Get the DIE(Debugging Information Entry) of this CU */ |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1026 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &pf->cu_die); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1027 | if (!diep) |
| 1028 | continue; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 1029 | |
| 1030 | /* Check if target file is included. */ |
| 1031 | if (pp->file) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1032 | pf->fname = cu_find_realpath(&pf->cu_die, pp->file); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1033 | else |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1034 | pf->fname = NULL; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 1035 | |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1036 | if (!pp->file || pf->fname) { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 1037 | if (pp->function) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1038 | ret = find_probe_point_by_func(pf); |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 1039 | else if (pp->lazy_line) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1040 | ret = find_probe_point_lazy(NULL, pf); |
Masami Hiramatsu | b0ef073 | 2009-10-27 16:43:19 -0400 | [diff] [blame] | 1041 | else { |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1042 | pf->lno = pp->line; |
| 1043 | ret = find_probe_point_by_line(pf); |
Masami Hiramatsu | b0ef073 | 2009-10-27 16:43:19 -0400 | [diff] [blame] | 1044 | } |
Arnaldo Carvalho de Melo | 8635bf6 | 2011-02-22 06:56:18 -0300 | [diff] [blame] | 1045 | if (ret < 0) |
Arnaldo Carvalho de Melo | fbee632 | 2011-02-21 13:23:57 -0300 | [diff] [blame] | 1046 | break; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 1047 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1048 | off = noff; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 1049 | } |
Lin Ming | cd25f8b | 2011-03-25 16:27:48 +0800 | [diff] [blame] | 1050 | |
| 1051 | found: |
Masami Hiramatsu | 5a62257 | 2014-02-06 05:32:09 +0000 | [diff] [blame] | 1052 | intlist__delete(pf->lcache); |
| 1053 | pf->lcache = NULL; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 1054 | |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1055 | return ret; |
| 1056 | } |
| 1057 | |
Masami Hiramatsu | 7969ec7 | 2013-10-11 16:10:23 +0900 | [diff] [blame] | 1058 | struct local_vars_finder { |
| 1059 | struct probe_finder *pf; |
| 1060 | struct perf_probe_arg *args; |
| 1061 | int max_args; |
| 1062 | int nargs; |
| 1063 | int ret; |
| 1064 | }; |
| 1065 | |
| 1066 | /* Collect available variables in this scope */ |
| 1067 | static int copy_variables_cb(Dwarf_Die *die_mem, void *data) |
| 1068 | { |
| 1069 | struct local_vars_finder *vf = data; |
Masami Hiramatsu | 3d918a1 | 2013-10-11 16:10:26 +0900 | [diff] [blame] | 1070 | struct probe_finder *pf = vf->pf; |
Masami Hiramatsu | 7969ec7 | 2013-10-11 16:10:23 +0900 | [diff] [blame] | 1071 | int tag; |
| 1072 | |
| 1073 | tag = dwarf_tag(die_mem); |
| 1074 | if (tag == DW_TAG_formal_parameter || |
| 1075 | tag == DW_TAG_variable) { |
| 1076 | if (convert_variable_location(die_mem, vf->pf->addr, |
Masami Hiramatsu | 3d918a1 | 2013-10-11 16:10:26 +0900 | [diff] [blame] | 1077 | vf->pf->fb_ops, &pf->sp_die, |
| 1078 | NULL) == 0) { |
Masami Hiramatsu | 7969ec7 | 2013-10-11 16:10:23 +0900 | [diff] [blame] | 1079 | vf->args[vf->nargs].var = (char *)dwarf_diename(die_mem); |
| 1080 | if (vf->args[vf->nargs].var == NULL) { |
| 1081 | vf->ret = -ENOMEM; |
| 1082 | return DIE_FIND_CB_END; |
| 1083 | } |
| 1084 | pr_debug(" %s", vf->args[vf->nargs].var); |
| 1085 | vf->nargs++; |
| 1086 | } |
| 1087 | } |
| 1088 | |
| 1089 | if (dwarf_haspc(die_mem, vf->pf->addr)) |
| 1090 | return DIE_FIND_CB_CONTINUE; |
| 1091 | else |
| 1092 | return DIE_FIND_CB_SIBLING; |
| 1093 | } |
| 1094 | |
| 1095 | static int expand_probe_args(Dwarf_Die *sc_die, struct probe_finder *pf, |
| 1096 | struct perf_probe_arg *args) |
| 1097 | { |
| 1098 | Dwarf_Die die_mem; |
| 1099 | int i; |
| 1100 | int n = 0; |
| 1101 | struct local_vars_finder vf = {.pf = pf, .args = args, |
| 1102 | .max_args = MAX_PROBE_ARGS, .ret = 0}; |
| 1103 | |
| 1104 | for (i = 0; i < pf->pev->nargs; i++) { |
| 1105 | /* var never be NULL */ |
| 1106 | if (strcmp(pf->pev->args[i].var, "$vars") == 0) { |
| 1107 | pr_debug("Expanding $vars into:"); |
| 1108 | vf.nargs = n; |
| 1109 | /* Special local variables */ |
| 1110 | die_find_child(sc_die, copy_variables_cb, (void *)&vf, |
| 1111 | &die_mem); |
| 1112 | pr_debug(" (%d)\n", vf.nargs - n); |
| 1113 | if (vf.ret < 0) |
| 1114 | return vf.ret; |
| 1115 | n = vf.nargs; |
| 1116 | } else { |
| 1117 | /* Copy normal argument */ |
| 1118 | args[n] = pf->pev->args[i]; |
| 1119 | n++; |
| 1120 | } |
| 1121 | } |
| 1122 | return n; |
| 1123 | } |
| 1124 | |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1125 | /* Add a found probe point into trace event list */ |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 1126 | static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1127 | { |
| 1128 | struct trace_event_finder *tf = |
| 1129 | container_of(pf, struct trace_event_finder, pf); |
| 1130 | struct probe_trace_event *tev; |
Masami Hiramatsu | 7969ec7 | 2013-10-11 16:10:23 +0900 | [diff] [blame] | 1131 | struct perf_probe_arg *args; |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1132 | int ret, i; |
| 1133 | |
| 1134 | /* Check number of tevs */ |
| 1135 | if (tf->ntevs == tf->max_tevs) { |
| 1136 | pr_warning("Too many( > %d) probe point found.\n", |
| 1137 | tf->max_tevs); |
| 1138 | return -ERANGE; |
| 1139 | } |
| 1140 | tev = &tf->tevs[tf->ntevs++]; |
| 1141 | |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 1142 | /* Trace point should be converted from subprogram DIE */ |
Masami Hiramatsu | 576b523 | 2013-09-25 22:16:16 +0900 | [diff] [blame] | 1143 | ret = convert_to_trace_point(&pf->sp_die, tf->mod, pf->addr, |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 1144 | pf->pev->point.retprobe, &tev->point); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1145 | if (ret < 0) |
| 1146 | return ret; |
| 1147 | |
| 1148 | pr_debug("Probe point found: %s+%lu\n", tev->point.symbol, |
| 1149 | tev->point.offset); |
| 1150 | |
Masami Hiramatsu | 7969ec7 | 2013-10-11 16:10:23 +0900 | [diff] [blame] | 1151 | /* Expand special probe argument if exist */ |
| 1152 | args = zalloc(sizeof(struct perf_probe_arg) * MAX_PROBE_ARGS); |
| 1153 | if (args == NULL) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1154 | return -ENOMEM; |
Masami Hiramatsu | 7969ec7 | 2013-10-11 16:10:23 +0900 | [diff] [blame] | 1155 | |
| 1156 | ret = expand_probe_args(sc_die, pf, args); |
| 1157 | if (ret < 0) |
| 1158 | goto end; |
| 1159 | |
| 1160 | tev->nargs = ret; |
| 1161 | tev->args = zalloc(sizeof(struct probe_trace_arg) * tev->nargs); |
| 1162 | if (tev->args == NULL) { |
| 1163 | ret = -ENOMEM; |
| 1164 | goto end; |
| 1165 | } |
| 1166 | |
| 1167 | /* Find each argument */ |
| 1168 | for (i = 0; i < tev->nargs; i++) { |
| 1169 | pf->pvar = &args[i]; |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1170 | pf->tvar = &tev->args[i]; |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 1171 | /* Variable should be found from scope DIE */ |
| 1172 | ret = find_variable(sc_die, pf); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1173 | if (ret != 0) |
Masami Hiramatsu | 7969ec7 | 2013-10-11 16:10:23 +0900 | [diff] [blame] | 1174 | break; |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1175 | } |
| 1176 | |
Masami Hiramatsu | 7969ec7 | 2013-10-11 16:10:23 +0900 | [diff] [blame] | 1177 | end: |
| 1178 | free(args); |
| 1179 | return ret; |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1180 | } |
| 1181 | |
| 1182 | /* Find probe_trace_events specified by perf_probe_event from debuginfo */ |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1183 | int debuginfo__find_trace_events(struct debuginfo *dbg, |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 1184 | struct perf_probe_event *pev, |
| 1185 | struct probe_trace_event **tevs, int max_tevs) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1186 | { |
| 1187 | struct trace_event_finder tf = { |
| 1188 | .pf = {.pev = pev, .callback = add_probe_trace_event}, |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1189 | .mod = dbg->mod, .max_tevs = max_tevs}; |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1190 | int ret; |
| 1191 | |
| 1192 | /* Allocate result tevs array */ |
| 1193 | *tevs = zalloc(sizeof(struct probe_trace_event) * max_tevs); |
| 1194 | if (*tevs == NULL) |
| 1195 | return -ENOMEM; |
| 1196 | |
| 1197 | tf.tevs = *tevs; |
| 1198 | tf.ntevs = 0; |
| 1199 | |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1200 | ret = debuginfo__find_probes(dbg, &tf.pf); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1201 | if (ret < 0) { |
Arnaldo Carvalho de Melo | 0466252 | 2013-12-26 17:41:15 -0300 | [diff] [blame] | 1202 | zfree(tevs); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1203 | return ret; |
| 1204 | } |
| 1205 | |
| 1206 | return (ret < 0) ? ret : tf.ntevs; |
| 1207 | } |
| 1208 | |
| 1209 | #define MAX_VAR_LEN 64 |
| 1210 | |
| 1211 | /* Collect available variables in this scope */ |
| 1212 | static int collect_variables_cb(Dwarf_Die *die_mem, void *data) |
| 1213 | { |
| 1214 | struct available_var_finder *af = data; |
| 1215 | struct variable_list *vl; |
| 1216 | char buf[MAX_VAR_LEN]; |
| 1217 | int tag, ret; |
| 1218 | |
| 1219 | vl = &af->vls[af->nvls - 1]; |
| 1220 | |
| 1221 | tag = dwarf_tag(die_mem); |
| 1222 | if (tag == DW_TAG_formal_parameter || |
| 1223 | tag == DW_TAG_variable) { |
| 1224 | ret = convert_variable_location(die_mem, af->pf.addr, |
Masami Hiramatsu | 3d918a1 | 2013-10-11 16:10:26 +0900 | [diff] [blame] | 1225 | af->pf.fb_ops, &af->pf.sp_die, |
| 1226 | NULL); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1227 | if (ret == 0) { |
| 1228 | ret = die_get_varname(die_mem, buf, MAX_VAR_LEN); |
Masami Hiramatsu | fb8c5a5 | 2010-10-21 19:13:35 +0900 | [diff] [blame] | 1229 | pr_debug2("Add new var: %s\n", buf); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1230 | if (ret > 0) |
| 1231 | strlist__add(vl->vars, buf); |
| 1232 | } |
| 1233 | } |
| 1234 | |
Masami Hiramatsu | fb8c5a5 | 2010-10-21 19:13:35 +0900 | [diff] [blame] | 1235 | if (af->child && dwarf_haspc(die_mem, af->pf.addr)) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1236 | return DIE_FIND_CB_CONTINUE; |
| 1237 | else |
| 1238 | return DIE_FIND_CB_SIBLING; |
| 1239 | } |
| 1240 | |
| 1241 | /* Add a found vars into available variables list */ |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 1242 | static int add_available_vars(Dwarf_Die *sc_die, struct probe_finder *pf) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1243 | { |
| 1244 | struct available_var_finder *af = |
| 1245 | container_of(pf, struct available_var_finder, pf); |
| 1246 | struct variable_list *vl; |
Masami Hiramatsu | f182e3e | 2011-08-11 20:03:05 +0900 | [diff] [blame] | 1247 | Dwarf_Die die_mem; |
| 1248 | int ret; |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1249 | |
| 1250 | /* Check number of tevs */ |
| 1251 | if (af->nvls == af->max_vls) { |
| 1252 | pr_warning("Too many( > %d) probe point found.\n", af->max_vls); |
| 1253 | return -ERANGE; |
| 1254 | } |
| 1255 | vl = &af->vls[af->nvls++]; |
| 1256 | |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 1257 | /* Trace point should be converted from subprogram DIE */ |
Masami Hiramatsu | 576b523 | 2013-09-25 22:16:16 +0900 | [diff] [blame] | 1258 | ret = convert_to_trace_point(&pf->sp_die, af->mod, pf->addr, |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 1259 | pf->pev->point.retprobe, &vl->point); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1260 | if (ret < 0) |
| 1261 | return ret; |
| 1262 | |
| 1263 | pr_debug("Probe point found: %s+%lu\n", vl->point.symbol, |
| 1264 | vl->point.offset); |
| 1265 | |
| 1266 | /* Find local variables */ |
| 1267 | vl->vars = strlist__new(true, NULL); |
| 1268 | if (vl->vars == NULL) |
| 1269 | return -ENOMEM; |
Masami Hiramatsu | fb8c5a5 | 2010-10-21 19:13:35 +0900 | [diff] [blame] | 1270 | af->child = true; |
Masami Hiramatsu | 221d061 | 2011-08-11 20:02:59 +0900 | [diff] [blame] | 1271 | die_find_child(sc_die, collect_variables_cb, (void *)af, &die_mem); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1272 | |
Masami Hiramatsu | fb8c5a5 | 2010-10-21 19:13:35 +0900 | [diff] [blame] | 1273 | /* Find external variables */ |
| 1274 | if (!af->externs) |
| 1275 | goto out; |
| 1276 | /* Don't need to search child DIE for externs. */ |
| 1277 | af->child = false; |
Masami Hiramatsu | f182e3e | 2011-08-11 20:03:05 +0900 | [diff] [blame] | 1278 | die_find_child(&pf->cu_die, collect_variables_cb, (void *)af, &die_mem); |
Masami Hiramatsu | fb8c5a5 | 2010-10-21 19:13:35 +0900 | [diff] [blame] | 1279 | |
| 1280 | out: |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1281 | if (strlist__empty(vl->vars)) { |
| 1282 | strlist__delete(vl->vars); |
| 1283 | vl->vars = NULL; |
| 1284 | } |
| 1285 | |
| 1286 | return ret; |
| 1287 | } |
| 1288 | |
Masami Hiramatsu | 69e96ea | 2014-06-06 07:13:59 +0000 | [diff] [blame] | 1289 | /* |
| 1290 | * Find available variables at given probe point |
| 1291 | * Return the number of found probe points. Return 0 if there is no |
| 1292 | * matched probe point. Return <0 if an error occurs. |
| 1293 | */ |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1294 | int debuginfo__find_available_vars_at(struct debuginfo *dbg, |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 1295 | struct perf_probe_event *pev, |
| 1296 | struct variable_list **vls, |
| 1297 | int max_vls, bool externs) |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1298 | { |
| 1299 | struct available_var_finder af = { |
| 1300 | .pf = {.pev = pev, .callback = add_available_vars}, |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1301 | .mod = dbg->mod, |
Masami Hiramatsu | fb8c5a5 | 2010-10-21 19:13:35 +0900 | [diff] [blame] | 1302 | .max_vls = max_vls, .externs = externs}; |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1303 | int ret; |
| 1304 | |
| 1305 | /* Allocate result vls array */ |
| 1306 | *vls = zalloc(sizeof(struct variable_list) * max_vls); |
| 1307 | if (*vls == NULL) |
| 1308 | return -ENOMEM; |
| 1309 | |
| 1310 | af.vls = *vls; |
| 1311 | af.nvls = 0; |
| 1312 | |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1313 | ret = debuginfo__find_probes(dbg, &af.pf); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1314 | if (ret < 0) { |
| 1315 | /* Free vlist for error */ |
| 1316 | while (af.nvls--) { |
Arnaldo Carvalho de Melo | 74cf249 | 2013-12-27 16:55:14 -0300 | [diff] [blame] | 1317 | zfree(&af.vls[af.nvls].point.symbol); |
Arnaldo Carvalho de Melo | f538565 | 2013-12-26 15:54:57 -0300 | [diff] [blame] | 1318 | strlist__delete(af.vls[af.nvls].vars); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1319 | } |
Arnaldo Carvalho de Melo | 0466252 | 2013-12-26 17:41:15 -0300 | [diff] [blame] | 1320 | zfree(vls); |
Masami Hiramatsu | cf6eb48 | 2010-10-21 19:13:23 +0900 | [diff] [blame] | 1321 | return ret; |
| 1322 | } |
| 1323 | |
| 1324 | return (ret < 0) ? ret : af.nvls; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 1325 | } |
| 1326 | |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1327 | /* Reverse search */ |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1328 | int debuginfo__find_probe_point(struct debuginfo *dbg, unsigned long addr, |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 1329 | struct perf_probe_point *ppt) |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1330 | { |
| 1331 | Dwarf_Die cudie, spdie, indie; |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1332 | Dwarf_Addr _addr = 0, baseaddr = 0; |
| 1333 | const char *fname = NULL, *func = NULL, *basefunc = NULL, *tmp; |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1334 | int baseline = 0, lineno = 0, ret = 0; |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1335 | |
Masami Hiramatsu | 469b9b8 | 2010-10-21 19:13:41 +0900 | [diff] [blame] | 1336 | /* Adjust address with bias */ |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1337 | addr += dbg->bias; |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 1338 | |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1339 | /* Find cu die */ |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1340 | if (!dwarf_addrdie(dbg->dbg, (Dwarf_Addr)addr - dbg->bias, &cudie)) { |
Masami Hiramatsu | 0e43e5d | 2010-12-17 22:12:11 +0900 | [diff] [blame] | 1341 | pr_warning("Failed to find debug information for address %lx\n", |
| 1342 | addr); |
Masami Hiramatsu | 75ec5a2 | 2010-04-02 12:50:59 -0400 | [diff] [blame] | 1343 | ret = -EINVAL; |
| 1344 | goto end; |
| 1345 | } |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1346 | |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1347 | /* Find a corresponding line (filename and lineno) */ |
| 1348 | cu_find_lineinfo(&cudie, addr, &fname, &lineno); |
| 1349 | /* Don't care whether it failed or not */ |
| 1350 | |
| 1351 | /* Find a corresponding function (name, baseline and baseaddr) */ |
Masami Hiramatsu | e0d153c | 2011-06-27 16:27:27 +0900 | [diff] [blame] | 1352 | if (die_find_realfunc(&cudie, (Dwarf_Addr)addr, &spdie)) { |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1353 | /* Get function entry information */ |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1354 | func = basefunc = dwarf_diename(&spdie); |
| 1355 | if (!func || |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1356 | dwarf_entrypc(&spdie, &baseaddr) != 0 || |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1357 | dwarf_decl_line(&spdie, &baseline) != 0) { |
| 1358 | lineno = 0; |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1359 | goto post; |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1360 | } |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1361 | |
Masami Hiramatsu | 1b286bd | 2013-10-11 12:23:17 +0000 | [diff] [blame] | 1362 | fname = dwarf_decl_file(&spdie); |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1363 | if (addr == (unsigned long)baseaddr) { |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1364 | /* Function entry - Relative line number is 0 */ |
| 1365 | lineno = baseline; |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1366 | goto post; |
| 1367 | } |
| 1368 | |
| 1369 | /* Track down the inline functions step by step */ |
| 1370 | while (die_find_top_inlinefunc(&spdie, (Dwarf_Addr)addr, |
| 1371 | &indie)) { |
| 1372 | /* There is an inline function */ |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1373 | if (dwarf_entrypc(&indie, &_addr) == 0 && |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1374 | _addr == addr) { |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1375 | /* |
| 1376 | * addr is at an inline function entry. |
| 1377 | * In this case, lineno should be the call-site |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1378 | * line number. (overwrite lineinfo) |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1379 | */ |
| 1380 | lineno = die_get_call_lineno(&indie); |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1381 | fname = die_get_call_file(&indie); |
| 1382 | break; |
| 1383 | } else { |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1384 | /* |
| 1385 | * addr is in an inline function body. |
| 1386 | * Since lineno points one of the lines |
| 1387 | * of the inline function, baseline should |
| 1388 | * be the entry line of the inline function. |
| 1389 | */ |
| 1390 | tmp = dwarf_diename(&indie); |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1391 | if (!tmp || |
| 1392 | dwarf_decl_line(&indie, &baseline) != 0) |
| 1393 | break; |
| 1394 | func = tmp; |
| 1395 | spdie = indie; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1396 | } |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1397 | } |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1398 | /* Verify the lineno and baseline are in a same file */ |
| 1399 | tmp = dwarf_decl_file(&spdie); |
| 1400 | if (!tmp || strcmp(tmp, fname) != 0) |
| 1401 | lineno = 0; |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1402 | } |
| 1403 | |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1404 | post: |
| 1405 | /* Make a relative line number or an offset */ |
| 1406 | if (lineno) |
| 1407 | ppt->line = lineno - baseline; |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1408 | else if (basefunc) { |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1409 | ppt->offset = addr - (unsigned long)baseaddr; |
Masami Hiramatsu | e08cfd4 | 2013-09-30 18:21:44 +0900 | [diff] [blame] | 1410 | func = basefunc; |
| 1411 | } |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1412 | |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1413 | /* Duplicate strings */ |
| 1414 | if (func) { |
| 1415 | ppt->function = strdup(func); |
Masami Hiramatsu | 02b95da | 2010-04-12 13:17:56 -0400 | [diff] [blame] | 1416 | if (ppt->function == NULL) { |
| 1417 | ret = -ENOMEM; |
| 1418 | goto end; |
| 1419 | } |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1420 | } |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1421 | if (fname) { |
| 1422 | ppt->file = strdup(fname); |
| 1423 | if (ppt->file == NULL) { |
Arnaldo Carvalho de Melo | 0466252 | 2013-12-26 17:41:15 -0300 | [diff] [blame] | 1424 | zfree(&ppt->function); |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1425 | ret = -ENOMEM; |
| 1426 | goto end; |
| 1427 | } |
| 1428 | } |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1429 | end: |
Masami Hiramatsu | 1d46ea2 | 2011-03-30 18:26:05 +0900 | [diff] [blame] | 1430 | if (ret == 0 && (fname || func)) |
| 1431 | ret = 1; /* Found a point */ |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1432 | return ret; |
| 1433 | } |
| 1434 | |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1435 | /* Add a line and store the src path */ |
| 1436 | static int line_range_add_line(const char *src, unsigned int lineno, |
| 1437 | struct line_range *lr) |
| 1438 | { |
Masami Hiramatsu | 7cf0b79 | 2010-07-09 18:28:59 +0900 | [diff] [blame] | 1439 | /* Copy source path */ |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1440 | if (!lr->path) { |
Masami Hiramatsu | 7cf0b79 | 2010-07-09 18:28:59 +0900 | [diff] [blame] | 1441 | lr->path = strdup(src); |
| 1442 | if (lr->path == NULL) |
| 1443 | return -ENOMEM; |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1444 | } |
Masami Hiramatsu | 5a62257 | 2014-02-06 05:32:09 +0000 | [diff] [blame] | 1445 | return intlist__add(lr->line_list, lineno); |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1446 | } |
| 1447 | |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 1448 | static int line_range_walk_cb(const char *fname, int lineno, |
Irina Tirdea | 1d037ca | 2012-09-11 01:15:03 +0300 | [diff] [blame] | 1449 | Dwarf_Addr addr __maybe_unused, |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 1450 | void *data) |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1451 | { |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 1452 | struct line_finder *lf = data; |
Namhyung Kim | 202c7c1 | 2014-04-01 13:47:57 +0900 | [diff] [blame] | 1453 | int err; |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1454 | |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 1455 | if ((strtailcmp(fname, lf->fname) != 0) || |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1456 | (lf->lno_s > lineno || lf->lno_e < lineno)) |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 1457 | return 0; |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1458 | |
Namhyung Kim | 202c7c1 | 2014-04-01 13:47:57 +0900 | [diff] [blame] | 1459 | err = line_range_add_line(fname, lineno, lf->lr); |
| 1460 | if (err < 0 && err != -EEXIST) |
| 1461 | return err; |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1462 | |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 1463 | return 0; |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1464 | } |
Masami Hiramatsu | fb1587d | 2010-03-16 18:06:19 -0400 | [diff] [blame] | 1465 | |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1466 | /* Find line range from its line number */ |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1467 | static int find_line_range_by_line(Dwarf_Die *sp_die, struct line_finder *lf) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1468 | { |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 1469 | int ret; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1470 | |
Masami Hiramatsu | 4cc9cec | 2011-01-13 21:45:58 +0900 | [diff] [blame] | 1471 | ret = die_walk_lines(sp_die ?: &lf->cu_die, line_range_walk_cb, lf); |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1472 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1473 | /* Update status */ |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1474 | if (ret >= 0) |
Masami Hiramatsu | 5a62257 | 2014-02-06 05:32:09 +0000 | [diff] [blame] | 1475 | if (!intlist__empty(lf->lr->line_list)) |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1476 | ret = lf->found = 1; |
| 1477 | else |
| 1478 | ret = 0; /* Lines are not found */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1479 | else { |
Arnaldo Carvalho de Melo | 0466252 | 2013-12-26 17:41:15 -0300 | [diff] [blame] | 1480 | zfree(&lf->lr->path); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1481 | } |
Masami Hiramatsu | f6c903f | 2010-04-14 18:40:07 -0400 | [diff] [blame] | 1482 | return ret; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1483 | } |
| 1484 | |
Masami Hiramatsu | 161a26b | 2010-02-25 08:35:57 -0500 | [diff] [blame] | 1485 | static int line_range_inline_cb(Dwarf_Die *in_die, void *data) |
| 1486 | { |
Masami Hiramatsu | 182c228 | 2014-04-02 14:48:31 +0900 | [diff] [blame] | 1487 | int ret = find_line_range_by_line(in_die, data); |
Masami Hiramatsu | 36c0c58 | 2011-08-11 20:02:47 +0900 | [diff] [blame] | 1488 | |
| 1489 | /* |
| 1490 | * We have to check all instances of inlined function, because |
| 1491 | * some execution paths can be optimized out depends on the |
Masami Hiramatsu | 182c228 | 2014-04-02 14:48:31 +0900 | [diff] [blame] | 1492 | * function argument of instances. However, if an error occurs, |
| 1493 | * it should be handled by the caller. |
Masami Hiramatsu | 36c0c58 | 2011-08-11 20:02:47 +0900 | [diff] [blame] | 1494 | */ |
Masami Hiramatsu | 182c228 | 2014-04-02 14:48:31 +0900 | [diff] [blame] | 1495 | return ret < 0 ? ret : 0; |
Masami Hiramatsu | 161a26b | 2010-02-25 08:35:57 -0500 | [diff] [blame] | 1496 | } |
| 1497 | |
Masami Hiramatsu | 0dbb1ca | 2012-04-23 12:24:36 +0900 | [diff] [blame] | 1498 | /* Search function definition from function name */ |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 1499 | static int line_range_search_cb(Dwarf_Die *sp_die, void *data) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1500 | { |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1501 | struct dwarf_callback_param *param = data; |
| 1502 | struct line_finder *lf = param->data; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1503 | struct line_range *lr = lf->lr; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1504 | |
Masami Hiramatsu | 7d21635 | 2011-03-30 18:25:41 +0900 | [diff] [blame] | 1505 | /* Check declared file */ |
| 1506 | if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die))) |
| 1507 | return DWARF_CB_OK; |
| 1508 | |
Masami Hiramatsu | 0dbb1ca | 2012-04-23 12:24:36 +0900 | [diff] [blame] | 1509 | if (die_is_func_def(sp_die) && |
Masami Hiramatsu | 8217563 | 2010-07-09 18:29:17 +0900 | [diff] [blame] | 1510 | die_compare_name(sp_die, lr->function)) { |
Masami Hiramatsu | e92b85e | 2010-02-25 08:35:50 -0500 | [diff] [blame] | 1511 | lf->fname = dwarf_decl_file(sp_die); |
| 1512 | dwarf_decl_line(sp_die, &lr->offset); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1513 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1514 | lf->lno_s = lr->offset + lr->start; |
Masami Hiramatsu | d3b63d7 | 2010-04-14 18:39:42 -0400 | [diff] [blame] | 1515 | if (lf->lno_s < 0) /* Overflow */ |
| 1516 | lf->lno_s = INT_MAX; |
| 1517 | lf->lno_e = lr->offset + lr->end; |
| 1518 | if (lf->lno_e < 0) /* Overflow */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1519 | lf->lno_e = INT_MAX; |
Masami Hiramatsu | d3b63d7 | 2010-04-14 18:39:42 -0400 | [diff] [blame] | 1520 | pr_debug("New line range: %d to %d\n", lf->lno_s, lf->lno_e); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1521 | lr->start = lf->lno_s; |
| 1522 | lr->end = lf->lno_e; |
Masami Hiramatsu | db0d2c6 | 2011-08-11 20:03:11 +0900 | [diff] [blame] | 1523 | if (dwarf_func_inline(sp_die)) |
| 1524 | param->retval = die_walk_instances(sp_die, |
| 1525 | line_range_inline_cb, lf); |
| 1526 | else |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1527 | param->retval = find_line_range_by_line(sp_die, lf); |
| 1528 | return DWARF_CB_ABORT; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1529 | } |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1530 | return DWARF_CB_OK; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1531 | } |
| 1532 | |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1533 | static int find_line_range_by_func(struct line_finder *lf) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1534 | { |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1535 | struct dwarf_callback_param param = {.data = (void *)lf, .retval = 0}; |
| 1536 | dwarf_getfuncs(&lf->cu_die, line_range_search_cb, ¶m, 0); |
| 1537 | return param.retval; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1538 | } |
| 1539 | |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1540 | int debuginfo__find_line_range(struct debuginfo *dbg, struct line_range *lr) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1541 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1542 | struct line_finder lf = {.lr = lr, .found = 0}; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1543 | int ret = 0; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1544 | Dwarf_Off off = 0, noff; |
| 1545 | size_t cuhl; |
| 1546 | Dwarf_Die *diep; |
Masami Hiramatsu | 6a330a3 | 2010-07-09 18:29:11 +0900 | [diff] [blame] | 1547 | const char *comp_dir; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1548 | |
Lin Ming | cd25f8b | 2011-03-25 16:27:48 +0800 | [diff] [blame] | 1549 | /* Fastpath: lookup by function name from .debug_pubnames section */ |
| 1550 | if (lr->function) { |
| 1551 | struct pubname_callback_param pubname_param = { |
| 1552 | .function = lr->function, .file = lr->file, |
| 1553 | .cu_die = &lf.cu_die, .sp_die = &lf.sp_die, .found = 0}; |
| 1554 | struct dwarf_callback_param line_range_param = { |
| 1555 | .data = (void *)&lf, .retval = 0}; |
| 1556 | |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1557 | dwarf_getpubnames(dbg->dbg, pubname_search_cb, |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 1558 | &pubname_param, 0); |
Lin Ming | cd25f8b | 2011-03-25 16:27:48 +0800 | [diff] [blame] | 1559 | if (pubname_param.found) { |
| 1560 | line_range_search_cb(&lf.sp_die, &line_range_param); |
| 1561 | if (lf.found) |
| 1562 | goto found; |
| 1563 | } |
| 1564 | } |
| 1565 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1566 | /* Loop on CUs (Compilation Unit) */ |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1567 | while (!lf.found && ret >= 0) { |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1568 | if (dwarf_nextcu(dbg->dbg, off, &noff, &cuhl, |
Masami Hiramatsu | ff74178 | 2011-06-27 16:27:39 +0900 | [diff] [blame] | 1569 | NULL, NULL, NULL) != 0) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1570 | break; |
| 1571 | |
| 1572 | /* Get the DIE(Debugging Information Entry) of this CU */ |
Arnaldo Carvalho de Melo | 316c713 | 2013-11-05 15:32:36 -0300 | [diff] [blame] | 1573 | diep = dwarf_offdie(dbg->dbg, off + cuhl, &lf.cu_die); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1574 | if (!diep) |
| 1575 | continue; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1576 | |
| 1577 | /* Check if target file is included. */ |
| 1578 | if (lr->file) |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 1579 | lf.fname = cu_find_realpath(&lf.cu_die, lr->file); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1580 | else |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 1581 | lf.fname = 0; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1582 | |
Masami Hiramatsu | 2a9c8c3 | 2010-02-25 08:36:12 -0500 | [diff] [blame] | 1583 | if (!lr->file || lf.fname) { |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1584 | if (lr->function) |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1585 | ret = find_line_range_by_func(&lf); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1586 | else { |
| 1587 | lf.lno_s = lr->start; |
Masami Hiramatsu | d3b63d7 | 2010-04-14 18:39:42 -0400 | [diff] [blame] | 1588 | lf.lno_e = lr->end; |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1589 | ret = find_line_range_by_line(NULL, &lf); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1590 | } |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1591 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame] | 1592 | off = noff; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1593 | } |
Masami Hiramatsu | 6a330a3 | 2010-07-09 18:29:11 +0900 | [diff] [blame] | 1594 | |
Lin Ming | cd25f8b | 2011-03-25 16:27:48 +0800 | [diff] [blame] | 1595 | found: |
Masami Hiramatsu | 6a330a3 | 2010-07-09 18:29:11 +0900 | [diff] [blame] | 1596 | /* Store comp_dir */ |
| 1597 | if (lf.found) { |
| 1598 | comp_dir = cu_get_comp_dir(&lf.cu_die); |
| 1599 | if (comp_dir) { |
| 1600 | lr->comp_dir = strdup(comp_dir); |
| 1601 | if (!lr->comp_dir) |
| 1602 | ret = -ENOMEM; |
| 1603 | } |
| 1604 | } |
| 1605 | |
Masami Hiramatsu | 7cf0b79 | 2010-07-09 18:28:59 +0900 | [diff] [blame] | 1606 | pr_debug("path: %s\n", lr->path); |
Masami Hiramatsu | b55a87a | 2010-04-12 13:17:35 -0400 | [diff] [blame] | 1607 | return (ret < 0) ? ret : lf.found; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 1608 | } |
| 1609 | |