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> |
| 29 | #include <getopt.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <string.h> |
| 32 | #include <stdarg.h> |
| 33 | #include <ctype.h> |
Masami Hiramatsu | 074fc0e | 2009-10-16 20:08:01 -0400 | [diff] [blame] | 34 | |
Masami Hiramatsu | 89c69c0 | 2009-10-16 20:08:10 -0400 | [diff] [blame] | 35 | #include "event.h" |
| 36 | #include "debug.h" |
Masami Hiramatsu | 074fc0e | 2009-10-16 20:08:01 -0400 | [diff] [blame] | 37 | #include "util.h" |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 38 | #include "probe-finder.h" |
| 39 | |
| 40 | |
| 41 | /* Dwarf_Die Linkage to parent Die */ |
| 42 | struct die_link { |
| 43 | struct die_link *parent; /* Parent die */ |
| 44 | Dwarf_Die die; /* Current die */ |
| 45 | }; |
| 46 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 47 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 48 | /* |
| 49 | * Generic dwarf analysis helpers |
| 50 | */ |
| 51 | |
| 52 | #define X86_32_MAX_REGS 8 |
| 53 | const char *x86_32_regs_table[X86_32_MAX_REGS] = { |
| 54 | "%ax", |
| 55 | "%cx", |
| 56 | "%dx", |
| 57 | "%bx", |
| 58 | "$stack", /* Stack address instead of %sp */ |
| 59 | "%bp", |
| 60 | "%si", |
| 61 | "%di", |
| 62 | }; |
| 63 | |
| 64 | #define X86_64_MAX_REGS 16 |
| 65 | const char *x86_64_regs_table[X86_64_MAX_REGS] = { |
| 66 | "%ax", |
| 67 | "%dx", |
| 68 | "%cx", |
| 69 | "%bx", |
| 70 | "%si", |
| 71 | "%di", |
| 72 | "%bp", |
| 73 | "%sp", |
| 74 | "%r8", |
| 75 | "%r9", |
| 76 | "%r10", |
| 77 | "%r11", |
| 78 | "%r12", |
| 79 | "%r13", |
| 80 | "%r14", |
| 81 | "%r15", |
| 82 | }; |
| 83 | |
| 84 | /* TODO: switching by dwarf address size */ |
| 85 | #ifdef __x86_64__ |
| 86 | #define ARCH_MAX_REGS X86_64_MAX_REGS |
| 87 | #define arch_regs_table x86_64_regs_table |
| 88 | #else |
| 89 | #define ARCH_MAX_REGS X86_32_MAX_REGS |
| 90 | #define arch_regs_table x86_32_regs_table |
| 91 | #endif |
| 92 | |
| 93 | /* Return architecture dependent register string (for kprobe-tracer) */ |
| 94 | static const char *get_arch_regstr(unsigned int n) |
| 95 | { |
| 96 | return (n <= ARCH_MAX_REGS) ? arch_regs_table[n] : NULL; |
| 97 | } |
| 98 | |
| 99 | /* |
| 100 | * Compare the tail of two strings. |
| 101 | * Return 0 if whole of either string is same as another's tail part. |
| 102 | */ |
| 103 | static int strtailcmp(const char *s1, const char *s2) |
| 104 | { |
| 105 | int i1 = strlen(s1); |
| 106 | int i2 = strlen(s2); |
Juha Leppanen | d56728b | 2009-12-07 12:00:40 -0500 | [diff] [blame] | 107 | while (--i1 >= 0 && --i2 >= 0) { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 108 | if (s1[i1] != s2[i2]) |
| 109 | return s1[i1] - s2[i2]; |
| 110 | } |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | /* Find the fileno of the target file. */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 115 | static int cu_find_fileno(Dwarf_Die *cu_die, const char *fname) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 116 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 117 | Dwarf_Files *files; |
| 118 | size_t nfiles, i; |
| 119 | const char *src; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 120 | int ret; |
| 121 | |
| 122 | if (!fname) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 123 | return -EINVAL; |
| 124 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 125 | ret = dwarf_getsrcfiles(cu_die, &files, &nfiles); |
| 126 | if (ret == 0) { |
| 127 | for (i = 0; i < nfiles; i++) { |
| 128 | src = dwarf_filesrc(files, i, NULL, NULL); |
| 129 | if (strtailcmp(src, fname) == 0) { |
| 130 | ret = (int)i; /*???: +1 or not?*/ |
| 131 | break; |
| 132 | } |
| 133 | } |
| 134 | if (ret) |
| 135 | pr_debug("found fno: %d\n", ret); |
| 136 | } |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 137 | return ret; |
| 138 | } |
| 139 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 140 | struct __addr_die_search_param { |
| 141 | Dwarf_Addr addr; |
| 142 | Dwarf_Die *die_mem; |
| 143 | }; |
| 144 | |
| 145 | static int __die_search_func_cb(Dwarf_Die *fn_die, void *data) |
| 146 | { |
| 147 | struct __addr_die_search_param *ad = data; |
| 148 | |
| 149 | if (dwarf_tag(fn_die) == DW_TAG_subprogram && |
| 150 | dwarf_haspc(fn_die, ad->addr)) { |
| 151 | memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); |
| 152 | return DWARF_CB_ABORT; |
| 153 | } |
| 154 | return DWARF_CB_OK; |
| 155 | } |
| 156 | |
| 157 | /* Search a real subprogram including this line, */ |
| 158 | static Dwarf_Die *die_get_real_subprogram(Dwarf_Die *cu_die, Dwarf_Addr addr, |
| 159 | Dwarf_Die *die_mem) |
| 160 | { |
| 161 | struct __addr_die_search_param ad; |
| 162 | ad.addr = addr; |
| 163 | ad.die_mem = die_mem; |
| 164 | /* dwarf_getscopes can't find subprogram. */ |
| 165 | if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0)) |
| 166 | return NULL; |
| 167 | else |
| 168 | return die_mem; |
| 169 | } |
| 170 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 171 | /* Compare diename and tname */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 172 | static bool die_compare_name(Dwarf_Die *dw_die, const char *tname) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 173 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 174 | const char *name; |
| 175 | name = dwarf_diename(dw_die); |
| 176 | DIE_IF(name == NULL); |
| 177 | return strcmp(tname, name); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 178 | } |
| 179 | |
| 180 | /* Check the address is in the subprogram(function). */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 181 | static bool die_within_subprogram(Dwarf_Die *sp_die, Dwarf_Addr addr, |
| 182 | size_t *offs) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 183 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 184 | Dwarf_Addr epc; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 185 | int ret; |
| 186 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 187 | ret = dwarf_haspc(sp_die, addr); |
| 188 | if (ret <= 0) |
| 189 | return false; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 190 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 191 | if (offs) { |
| 192 | ret = dwarf_entrypc(sp_die, &epc); |
| 193 | DIE_IF(ret == -1); |
| 194 | *offs = addr - epc; |
| 195 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 196 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 197 | return true; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | /* Get entry pc(or low pc, 1st entry of ranges) of the die */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 201 | static Dwarf_Addr die_get_entrypc(Dwarf_Die *dw_die) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 202 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 203 | Dwarf_Addr epc; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 204 | int ret; |
| 205 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 206 | ret = dwarf_entrypc(dw_die, &epc); |
| 207 | DIE_IF(ret == -1); |
| 208 | return epc; |
| 209 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 210 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 211 | /* Check if the abstract origin's address or not */ |
| 212 | static bool die_compare_abstract_origin(Dwarf_Die *in_die, void *origin_addr) |
| 213 | { |
| 214 | Dwarf_Attribute attr; |
| 215 | Dwarf_Die origin; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 216 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 217 | if (!dwarf_attr(in_die, DW_AT_abstract_origin, &attr)) |
| 218 | return false; |
| 219 | if (!dwarf_formref_die(&attr, &origin)) |
| 220 | return false; |
| 221 | |
| 222 | return origin.addr == origin_addr; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | /* |
| 226 | * Search a Die from Die tree. |
| 227 | * Note: cur_link->die should be deallocated in this function. |
| 228 | */ |
| 229 | static int __search_die_tree(struct die_link *cur_link, |
| 230 | int (*die_cb)(struct die_link *, void *), |
| 231 | void *data) |
| 232 | { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 233 | struct die_link new_link; |
| 234 | int ret; |
| 235 | |
| 236 | if (!die_cb) |
| 237 | return 0; |
| 238 | |
| 239 | /* Check current die */ |
| 240 | while (!(ret = die_cb(cur_link, data))) { |
| 241 | /* Check child die */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 242 | ret = dwarf_child(&cur_link->die, &new_link.die); |
| 243 | if (ret == 0) { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 244 | new_link.parent = cur_link; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 245 | ret = __search_die_tree(&new_link, die_cb, data); |
| 246 | if (ret) |
| 247 | break; |
| 248 | } |
| 249 | |
| 250 | /* Move to next sibling */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 251 | ret = dwarf_siblingof(&cur_link->die, &cur_link->die); |
| 252 | if (ret != 0) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 253 | return 0; |
| 254 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 255 | return ret; |
| 256 | } |
| 257 | |
| 258 | /* Search a die in its children's die tree */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 259 | static int search_die_from_children(Dwarf_Die *parent_die, |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 260 | int (*die_cb)(struct die_link *, void *), |
| 261 | void *data) |
| 262 | { |
| 263 | struct die_link new_link; |
| 264 | int ret; |
| 265 | |
| 266 | new_link.parent = NULL; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 267 | ret = dwarf_child(parent_die, &new_link.die); |
| 268 | if (ret == 0) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 269 | return __search_die_tree(&new_link, die_cb, data); |
| 270 | else |
| 271 | return 0; |
| 272 | } |
| 273 | |
Masami Hiramatsu | b0ef073 | 2009-10-27 16:43:19 -0400 | [diff] [blame] | 274 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 275 | /* |
| 276 | * Probe finder related functions |
| 277 | */ |
| 278 | |
| 279 | /* Show a location */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 280 | static void show_location(Dwarf_Op *op, struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 281 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 282 | unsigned int regn; |
| 283 | Dwarf_Word offs = 0; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 284 | int deref = 0, ret; |
| 285 | const char *regs; |
| 286 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 287 | /* TODO: support CFA */ |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 288 | /* If this is based on frame buffer, set the offset */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 289 | if (op->atom == DW_OP_fbreg) { |
| 290 | if (pf->fb_ops == NULL) |
| 291 | die("The attribute of frame base is not supported.\n"); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 292 | deref = 1; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 293 | offs = op->number; |
| 294 | op = &pf->fb_ops[0]; |
| 295 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 296 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 297 | if (op->atom >= DW_OP_breg0 && op->atom <= DW_OP_breg31) { |
| 298 | regn = op->atom - DW_OP_breg0; |
| 299 | offs += op->number; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 300 | deref = 1; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 301 | } else if (op->atom >= DW_OP_reg0 && op->atom <= DW_OP_reg31) { |
| 302 | regn = op->atom - DW_OP_reg0; |
| 303 | } else if (op->atom == DW_OP_bregx) { |
| 304 | regn = op->number; |
| 305 | offs += op->number2; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 306 | deref = 1; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 307 | } else if (op->atom == DW_OP_regx) { |
| 308 | regn = op->number; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 309 | } else |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 310 | die("DW_OP %d is not supported.", op->atom); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 311 | |
| 312 | regs = get_arch_regstr(regn); |
| 313 | if (!regs) |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 314 | die("%u exceeds max register number.", regn); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 315 | |
| 316 | if (deref) |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 317 | ret = snprintf(pf->buf, pf->len, " %s=+%ju(%s)", |
| 318 | pf->var, (uintmax_t)offs, regs); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 319 | else |
| 320 | ret = snprintf(pf->buf, pf->len, " %s=%s", pf->var, regs); |
Masami Hiramatsu | 9769833 | 2009-10-16 20:08:18 -0400 | [diff] [blame] | 321 | DIE_IF(ret < 0); |
| 322 | DIE_IF(ret >= pf->len); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | /* Show a variables in kprobe event format */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 326 | static void show_variable(Dwarf_Die *vr_die, struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 327 | { |
| 328 | Dwarf_Attribute attr; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 329 | Dwarf_Op *expr; |
| 330 | size_t nexpr; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 331 | int ret; |
| 332 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 333 | if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 334 | goto error; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 335 | /* TODO: handle more than 1 exprs */ |
| 336 | ret = dwarf_getlocation_addr(&attr, (pf->addr - pf->cu_base), |
| 337 | &expr, &nexpr, 1); |
| 338 | if (ret <= 0 || nexpr == 0) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 339 | goto error; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 340 | |
| 341 | show_location(expr, pf); |
| 342 | /* *expr will be cached in libdw. Don't free it. */ |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 343 | return ; |
| 344 | error: |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 345 | /* TODO: Support const_value */ |
Masami Hiramatsu | 074fc0e | 2009-10-16 20:08:01 -0400 | [diff] [blame] | 346 | die("Failed to find the location of %s at this address.\n" |
Masami Hiramatsu | bbaa46f | 2010-01-05 17:47:03 -0500 | [diff] [blame] | 347 | " Perhaps, it has been optimized out.", pf->var); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 348 | } |
| 349 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 350 | static int variable_search_cb(struct die_link *dlink, void *data) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 351 | { |
| 352 | struct probe_finder *pf = (struct probe_finder *)data; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 353 | int tag; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 354 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 355 | tag = dwarf_tag(&dlink->die); |
| 356 | DIE_IF(tag < 0); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 357 | if ((tag == DW_TAG_formal_parameter || |
| 358 | tag == DW_TAG_variable) && |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 359 | (die_compare_name(&dlink->die, pf->var) == 0)) { |
| 360 | show_variable(&dlink->die, pf); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 361 | return 1; |
| 362 | } |
| 363 | /* TODO: Support struct members and arrays */ |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | /* Find a variable in a subprogram die */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 368 | static void find_variable(Dwarf_Die *sp_die, struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 369 | { |
| 370 | int ret; |
| 371 | |
| 372 | if (!is_c_varname(pf->var)) { |
| 373 | /* Output raw parameters */ |
| 374 | ret = snprintf(pf->buf, pf->len, " %s", pf->var); |
Masami Hiramatsu | 9769833 | 2009-10-16 20:08:18 -0400 | [diff] [blame] | 375 | DIE_IF(ret < 0); |
| 376 | DIE_IF(ret >= pf->len); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 377 | return ; |
| 378 | } |
| 379 | |
Arnaldo Carvalho de Melo | b7cb10e | 2009-10-21 17:34:06 -0200 | [diff] [blame] | 380 | pr_debug("Searching '%s' variable in context.\n", pf->var); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 381 | /* Search child die for local variables and parameters. */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 382 | ret = search_die_from_children(sp_die, variable_search_cb, pf); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 383 | if (!ret) |
Masami Hiramatsu | bbaa46f | 2010-01-05 17:47:03 -0500 | [diff] [blame] | 384 | die("Failed to find '%s' in this function.", pf->var); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 385 | } |
| 386 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 387 | /* Show a probe point to output buffer */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 388 | static void show_probe_point(Dwarf_Die *sp_die, size_t offs, |
Masami Hiramatsu | 81cb8aa | 2010-02-25 08:35:34 -0500 | [diff] [blame] | 389 | struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 390 | { |
| 391 | struct probe_point *pp = pf->pp; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 392 | const char *name; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 393 | char tmp[MAX_PROBE_BUFFER]; |
| 394 | int ret, i, len; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 395 | Dwarf_Attribute fb_attr; |
| 396 | size_t nops; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 397 | |
| 398 | /* Output name of probe point */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 399 | name = dwarf_diename(sp_die); |
| 400 | if (name) { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 401 | ret = snprintf(tmp, MAX_PROBE_BUFFER, "%s+%u", name, |
| 402 | (unsigned int)offs); |
Masami Hiramatsu | 253977b | 2009-10-27 16:43:10 -0400 | [diff] [blame] | 403 | /* Copy the function name if possible */ |
| 404 | if (!pp->function) { |
| 405 | pp->function = strdup(name); |
| 406 | pp->offset = offs; |
| 407 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 408 | } else { |
| 409 | /* This function has no name. */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 410 | ret = snprintf(tmp, MAX_PROBE_BUFFER, "0x%jx", |
| 411 | (uintmax_t)pf->addr); |
Masami Hiramatsu | 253977b | 2009-10-27 16:43:10 -0400 | [diff] [blame] | 412 | if (!pp->function) { |
| 413 | /* TODO: Use _stext */ |
| 414 | pp->function = strdup(""); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 415 | pp->offset = (size_t)pf->addr; |
Masami Hiramatsu | 253977b | 2009-10-27 16:43:10 -0400 | [diff] [blame] | 416 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 417 | } |
Masami Hiramatsu | 9769833 | 2009-10-16 20:08:18 -0400 | [diff] [blame] | 418 | DIE_IF(ret < 0); |
| 419 | DIE_IF(ret >= MAX_PROBE_BUFFER); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 420 | len = ret; |
Masami Hiramatsu | b0ef073 | 2009-10-27 16:43:19 -0400 | [diff] [blame] | 421 | pr_debug("Probe point found: %s\n", tmp); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 422 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 423 | /* Get the frame base attribute/ops */ |
| 424 | dwarf_attr(sp_die, DW_AT_frame_base, &fb_attr); |
| 425 | ret = dwarf_getlocation_addr(&fb_attr, (pf->addr - pf->cu_base), |
| 426 | &pf->fb_ops, &nops, 1); |
| 427 | if (ret <= 0 || nops == 0) |
| 428 | pf->fb_ops = NULL; |
| 429 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 430 | /* Find each argument */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 431 | /* TODO: use dwarf_cfi_addrframe */ |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 432 | for (i = 0; i < pp->nr_args; i++) { |
| 433 | pf->var = pp->args[i]; |
| 434 | pf->buf = &tmp[len]; |
| 435 | pf->len = MAX_PROBE_BUFFER - len; |
| 436 | find_variable(sp_die, pf); |
| 437 | len += strlen(pf->buf); |
| 438 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 439 | |
| 440 | /* *pf->fb_ops will be cached in libdw. Don't free it. */ |
| 441 | pf->fb_ops = NULL; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 442 | |
| 443 | pp->probes[pp->found] = strdup(tmp); |
| 444 | pp->found++; |
| 445 | } |
| 446 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 447 | /* Find probe point from its line number */ |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 448 | static void find_probe_point_by_line(struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 449 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 450 | Dwarf_Lines *lines; |
| 451 | Dwarf_Line *line; |
| 452 | size_t nlines, i; |
| 453 | Dwarf_Addr addr, epc; |
| 454 | int lineno; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 455 | int ret; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 456 | Dwarf_Die *sp_die, die_mem; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 457 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 458 | ret = dwarf_getsrclines(&pf->cu_die, &lines, &nlines); |
| 459 | DIE_IF(ret != 0); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 460 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 461 | for (i = 0; i < nlines; i++) { |
| 462 | line = dwarf_onesrcline(lines, i); |
| 463 | dwarf_lineno(line, &lineno); |
Masami Hiramatsu | b0ef073 | 2009-10-27 16:43:19 -0400 | [diff] [blame] | 464 | if (lineno != pf->lno) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 465 | continue; |
| 466 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 467 | /* TODO: Get fileno from line, but how? */ |
| 468 | if (strtailcmp(dwarf_linesrc(line, NULL, NULL), pf->fname) != 0) |
| 469 | continue; |
Masami Hiramatsu | b0ef073 | 2009-10-27 16:43:19 -0400 | [diff] [blame] | 470 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 471 | ret = dwarf_lineaddr(line, &addr); |
| 472 | DIE_IF(ret != 0); |
| 473 | pr_debug("Probe line found: line[%d]:%d addr:0x%jx\n", |
| 474 | (int)i, lineno, (uintmax_t)addr); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 475 | pf->addr = addr; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 476 | |
| 477 | sp_die = die_get_real_subprogram(&pf->cu_die, addr, &die_mem); |
| 478 | if (!sp_die) |
Masami Hiramatsu | bbaa46f | 2010-01-05 17:47:03 -0500 | [diff] [blame] | 479 | die("Probe point is not found in subprograms."); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 480 | dwarf_entrypc(sp_die, &epc); |
| 481 | show_probe_point(sp_die, (size_t)(addr - epc), pf); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 482 | /* Continuing, because target line might be inlined. */ |
| 483 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 484 | } |
| 485 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 486 | |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 487 | /* Search function from function name */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 488 | static int probe_point_search_cb(struct die_link *dlink, void *data) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 489 | { |
| 490 | struct probe_finder *pf = (struct probe_finder *)data; |
| 491 | struct probe_point *pp = pf->pp; |
| 492 | struct die_link *lk; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 493 | size_t offs; |
| 494 | int tag; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 495 | int ret; |
| 496 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 497 | tag = dwarf_tag(&dlink->die); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 498 | if (tag == DW_TAG_subprogram) { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 499 | if (die_compare_name(&dlink->die, pp->function) == 0) { |
Masami Hiramatsu | b0ef073 | 2009-10-27 16:43:19 -0400 | [diff] [blame] | 500 | if (pp->line) { /* Function relative line */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 501 | pf->fname = dwarf_decl_file(&dlink->die); |
| 502 | dwarf_decl_line(&dlink->die, &pf->lno); |
| 503 | pf->lno += pp->line; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 504 | find_probe_point_by_line(pf); |
Masami Hiramatsu | b0ef073 | 2009-10-27 16:43:19 -0400 | [diff] [blame] | 505 | return 1; |
| 506 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 507 | if (dwarf_func_inline(&dlink->die)) { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 508 | /* Inlined function, save it. */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 509 | pf->origin = dlink->die.addr; |
Masami Hiramatsu | 8030c5f | 2009-10-27 16:42:53 -0400 | [diff] [blame] | 510 | return 0; /* Continue to search */ |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 511 | } |
| 512 | /* Get probe address */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 513 | pf->addr = die_get_entrypc(&dlink->die); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 514 | pf->addr += pp->offset; |
| 515 | /* TODO: Check the address in this function */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 516 | show_probe_point(&dlink->die, pp->offset, pf); |
Masami Hiramatsu | 8030c5f | 2009-10-27 16:42:53 -0400 | [diff] [blame] | 517 | return 1; /* Exit; no same symbol in this CU. */ |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 518 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 519 | } else if (tag == DW_TAG_inlined_subroutine && pf->origin) { |
| 520 | if (die_compare_abstract_origin(&dlink->die, pf->origin)) { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 521 | /* Get probe address */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 522 | pf->addr = die_get_entrypc(&dlink->die); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 523 | pf->addr += pp->offset; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 524 | pr_debug("found inline addr: 0x%jx\n", |
| 525 | (uintmax_t)pf->addr); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 526 | /* Inlined function. Get a real subprogram */ |
| 527 | for (lk = dlink->parent; lk != NULL; lk = lk->parent) { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 528 | tag = dwarf_tag(&lk->die); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 529 | if (tag == DW_TAG_subprogram && |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 530 | !dwarf_func_inline(&lk->die)) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 531 | goto found; |
| 532 | } |
Masami Hiramatsu | bbaa46f | 2010-01-05 17:47:03 -0500 | [diff] [blame] | 533 | die("Failed to find real subprogram."); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 534 | found: |
| 535 | /* Get offset from subprogram */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 536 | ret = die_within_subprogram(&lk->die, pf->addr, &offs); |
Masami Hiramatsu | 9769833 | 2009-10-16 20:08:18 -0400 | [diff] [blame] | 537 | DIE_IF(!ret); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 538 | show_probe_point(&lk->die, offs, pf); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 539 | /* Continue to search */ |
| 540 | } |
| 541 | } |
| 542 | return 0; |
| 543 | } |
| 544 | |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 545 | static void find_probe_point_by_func(struct probe_finder *pf) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 546 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 547 | search_die_from_children(&pf->cu_die, probe_point_search_cb, pf); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 548 | } |
| 549 | |
| 550 | /* Find a probe point */ |
Masami Hiramatsu | 81cb8aa | 2010-02-25 08:35:34 -0500 | [diff] [blame] | 551 | int find_probe_point(int fd, struct probe_point *pp) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 552 | { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 553 | struct probe_finder pf = {.pp = pp}; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 554 | int ret; |
| 555 | Dwarf_Off off, noff; |
| 556 | size_t cuhl; |
| 557 | Dwarf_Die *diep; |
| 558 | Dwarf *dbg; |
| 559 | int fno = 0; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 560 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 561 | dbg = dwarf_begin(fd, DWARF_C_READ); |
| 562 | if (!dbg) |
Masami Hiramatsu | a225a1d | 2009-11-03 19:12:30 -0500 | [diff] [blame] | 563 | return -ENOENT; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 564 | |
| 565 | pp->found = 0; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 566 | off = 0; |
| 567 | /* Loop on CUs (Compilation Unit) */ |
| 568 | while (!dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL)) { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 569 | /* Get the DIE(Debugging Information Entry) of this CU */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 570 | diep = dwarf_offdie(dbg, off + cuhl, &pf.cu_die); |
| 571 | if (!diep) |
| 572 | continue; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 573 | |
| 574 | /* Check if target file is included. */ |
| 575 | if (pp->file) |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 576 | fno = cu_find_fileno(&pf.cu_die, pp->file); |
| 577 | else |
| 578 | fno = 0; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 579 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 580 | if (!pp->file || fno) { |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 581 | /* Save CU base address (for frame_base) */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 582 | ret = dwarf_lowpc(&pf.cu_die, &pf.cu_base); |
| 583 | if (ret != 0) |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 584 | pf.cu_base = 0; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 585 | if (pp->function) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 586 | find_probe_point_by_func(&pf); |
Masami Hiramatsu | b0ef073 | 2009-10-27 16:43:19 -0400 | [diff] [blame] | 587 | else { |
| 588 | pf.lno = pp->line; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 589 | find_probe_point_by_line(&pf); |
Masami Hiramatsu | b0ef073 | 2009-10-27 16:43:19 -0400 | [diff] [blame] | 590 | } |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 591 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 592 | off = noff; |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 593 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 594 | dwarf_end(dbg); |
Masami Hiramatsu | 4ea42b1 | 2009-10-08 17:17:38 -0400 | [diff] [blame] | 595 | |
| 596 | return pp->found; |
| 597 | } |
| 598 | |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 599 | |
| 600 | static void line_range_add_line(struct line_range *lr, unsigned int line) |
| 601 | { |
| 602 | struct line_node *ln; |
| 603 | struct list_head *p; |
| 604 | |
| 605 | /* Reverse search, because new line will be the last one */ |
| 606 | list_for_each_entry_reverse(ln, &lr->line_list, list) { |
| 607 | if (ln->line < line) { |
| 608 | p = &ln->list; |
| 609 | goto found; |
| 610 | } else if (ln->line == line) /* Already exist */ |
| 611 | return ; |
| 612 | } |
| 613 | /* List is empty, or the smallest entry */ |
| 614 | p = &lr->line_list; |
| 615 | found: |
| 616 | pr_debug("Debug: add a line %u\n", line); |
| 617 | ln = zalloc(sizeof(struct line_node)); |
| 618 | DIE_IF(ln == NULL); |
| 619 | ln->line = line; |
| 620 | INIT_LIST_HEAD(&ln->list); |
| 621 | list_add(&ln->list, p); |
| 622 | } |
| 623 | |
| 624 | /* Find line range from its line number */ |
| 625 | static void find_line_range_by_line(struct line_finder *lf) |
| 626 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 627 | Dwarf_Lines *lines; |
| 628 | Dwarf_Line *line; |
| 629 | size_t nlines, i; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 630 | Dwarf_Addr addr; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 631 | int lineno; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 632 | int ret; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 633 | const char *src; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 634 | |
Masami Hiramatsu | 3cb8bc6 | 2010-02-25 08:35:27 -0500 | [diff] [blame] | 635 | INIT_LIST_HEAD(&lf->lr->line_list); |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 636 | ret = dwarf_getsrclines(&lf->cu_die, &lines, &nlines); |
| 637 | DIE_IF(ret != 0); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 638 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 639 | for (i = 0; i < nlines; i++) { |
| 640 | line = dwarf_onesrcline(lines, i); |
| 641 | dwarf_lineno(line, &lineno); |
| 642 | if (lf->lno_s > lineno || lf->lno_e < lineno) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 643 | continue; |
| 644 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 645 | /* TODO: Get fileno from line, but how? */ |
| 646 | src = dwarf_linesrc(line, NULL, NULL); |
| 647 | if (strtailcmp(src, lf->fname) != 0) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 648 | continue; |
| 649 | |
| 650 | /* Filter line in the function address range */ |
| 651 | if (lf->addr_s && lf->addr_e) { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 652 | ret = dwarf_lineaddr(line, &addr); |
| 653 | DIE_IF(ret != 0); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 654 | if (lf->addr_s > addr || lf->addr_e <= addr) |
| 655 | continue; |
| 656 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 657 | /* Copy real path */ |
| 658 | if (!lf->lr->path) |
| 659 | lf->lr->path = strdup(src); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 660 | line_range_add_line(lf->lr, (unsigned int)lineno); |
| 661 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 662 | /* Update status */ |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 663 | if (!list_empty(&lf->lr->line_list)) |
| 664 | lf->found = 1; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 665 | else { |
| 666 | free(lf->lr->path); |
| 667 | lf->lr->path = NULL; |
| 668 | } |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 669 | } |
| 670 | |
| 671 | /* Search function from function name */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 672 | static int line_range_search_cb(struct die_link *dlink, void *data) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 673 | { |
| 674 | struct line_finder *lf = (struct line_finder *)data; |
| 675 | struct line_range *lr = lf->lr; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 676 | int tag; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 677 | int ret; |
| 678 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 679 | tag = dwarf_tag(&dlink->die); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 680 | if (tag == DW_TAG_subprogram && |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 681 | die_compare_name(&dlink->die, lr->function) == 0) { |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 682 | /* Get the address range of this function */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 683 | ret = dwarf_highpc(&dlink->die, &lf->addr_e); |
| 684 | if (ret == 0) |
| 685 | ret = dwarf_lowpc(&dlink->die, &lf->addr_s); |
| 686 | if (ret != 0) { |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 687 | lf->addr_s = 0; |
| 688 | lf->addr_e = 0; |
| 689 | } |
| 690 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 691 | lf->fname = dwarf_decl_file(&dlink->die); |
| 692 | dwarf_decl_line(&dlink->die, &lr->offset); |
| 693 | pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 694 | lf->lno_s = lr->offset + lr->start; |
| 695 | if (!lr->end) |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 696 | lf->lno_e = INT_MAX; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 697 | else |
| 698 | lf->lno_e = lr->offset + lr->end; |
| 699 | lr->start = lf->lno_s; |
| 700 | lr->end = lf->lno_e; |
| 701 | find_line_range_by_line(lf); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 702 | return 1; |
| 703 | } |
| 704 | return 0; |
| 705 | } |
| 706 | |
| 707 | static void find_line_range_by_func(struct line_finder *lf) |
| 708 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 709 | search_die_from_children(&lf->cu_die, line_range_search_cb, lf); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 710 | } |
| 711 | |
| 712 | int find_line_range(int fd, struct line_range *lr) |
| 713 | { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 714 | struct line_finder lf = {.lr = lr, .found = 0}; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 715 | int ret; |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 716 | Dwarf_Off off = 0, noff; |
| 717 | size_t cuhl; |
| 718 | Dwarf_Die *diep; |
| 719 | Dwarf *dbg; |
| 720 | int fno; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 721 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 722 | dbg = dwarf_begin(fd, DWARF_C_READ); |
| 723 | if (!dbg) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 724 | return -ENOENT; |
| 725 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 726 | /* Loop on CUs (Compilation Unit) */ |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 727 | while (!lf.found) { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 728 | ret = dwarf_nextcu(dbg, off, &noff, &cuhl, NULL, NULL, NULL); |
| 729 | if (ret != 0) |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 730 | break; |
| 731 | |
| 732 | /* Get the DIE(Debugging Information Entry) of this CU */ |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 733 | diep = dwarf_offdie(dbg, off + cuhl, &lf.cu_die); |
| 734 | if (!diep) |
| 735 | continue; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 736 | |
| 737 | /* Check if target file is included. */ |
| 738 | if (lr->file) |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 739 | fno = cu_find_fileno(&lf.cu_die, lr->file); |
| 740 | else |
| 741 | fno = 0; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 742 | |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 743 | if (!lr->file || fno) { |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 744 | if (lr->function) |
| 745 | find_line_range_by_func(&lf); |
| 746 | else { |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 747 | lf.fname = lr->file; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 748 | lf.lno_s = lr->start; |
| 749 | if (!lr->end) |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 750 | lf.lno_e = INT_MAX; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 751 | else |
| 752 | lf.lno_e = lr->end; |
| 753 | find_line_range_by_line(&lf); |
| 754 | } |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 755 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 756 | off = noff; |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 757 | } |
Masami Hiramatsu | 804b360 | 2010-02-25 08:35:42 -0500 | [diff] [blame^] | 758 | pr_debug("path: %lx\n", (unsigned long)lr->path); |
| 759 | dwarf_end(dbg); |
Masami Hiramatsu | 631c9de | 2010-01-06 09:45:34 -0500 | [diff] [blame] | 760 | return lf.found; |
| 761 | } |
| 762 | |