The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2006 The Android Open Source Project |
| 3 | */ |
| 4 | |
| 5 | #include <dirent.h> |
| 6 | #include <sys/ptrace.h> |
| 7 | #include <stdint.h> |
| 8 | #include <thread_db.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <stdio.h> |
| 11 | |
| 12 | extern int ps_pglobal_lookup (void *, const char *obj, const char *name, void **sym_addr); |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 13 | extern pid_t ps_getpid(struct ps_prochandle *ph); |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 14 | |
| 15 | /* |
| 16 | * This is the list of "special" symbols we care about whose addresses are |
| 17 | * cached by gdbserver from the host at init time. |
| 18 | */ |
| 19 | enum { |
| 20 | SYM_TD_CREATE, |
| 21 | SYM_THREAD_LIST, |
| 22 | NUM_SYMS |
| 23 | }; |
| 24 | |
| 25 | static char const * gSymbols[] = { |
| 26 | [SYM_TD_CREATE] = "_thread_created_hook", |
| 27 | NULL |
| 28 | }; |
| 29 | |
| 30 | |
| 31 | char const ** |
| 32 | td_symbol_list(void) |
| 33 | { |
| 34 | return gSymbols; |
| 35 | } |
| 36 | |
| 37 | |
| 38 | td_err_e |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 39 | td_ta_new(struct ps_prochandle * proc_handle, td_thragent_t ** agent_out) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 40 | { |
| 41 | td_thragent_t * agent; |
| 42 | |
| 43 | agent = (td_thragent_t *)malloc(sizeof(td_thragent_t)); |
| 44 | if (!agent) { |
| 45 | return TD_MALLOC; |
| 46 | } |
| 47 | |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 48 | agent->pid = ps_getpid(proc_handle); |
| 49 | agent->ph = proc_handle; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 50 | *agent_out = agent; |
| 51 | |
| 52 | return TD_OK; |
| 53 | } |
| 54 | |
| 55 | |
| 56 | td_err_e |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 57 | td_ta_delete(td_thragent_t * ta) |
| 58 | { |
| 59 | free(ta); |
| 60 | // FIXME: anything else to do? |
| 61 | return TD_OK; |
| 62 | } |
| 63 | |
| 64 | |
| 65 | /* NOTE: not used by gdb 7.0 */ |
| 66 | |
| 67 | td_err_e |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 68 | td_ta_set_event(td_thragent_t const * agent, td_thr_events_t * events) |
| 69 | { |
| 70 | return TD_OK; |
| 71 | } |
| 72 | |
| 73 | |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 74 | /* NOTE: not used by gdb 7.0 */ |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 75 | static td_thrhandle_t gEventMsgHandle; |
| 76 | |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 77 | /* NOTE: not used by gdb 7.0 */ |
| 78 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 79 | static int |
| 80 | _event_getmsg_helper(td_thrhandle_t const * handle, void * bkpt_addr) |
| 81 | { |
| 82 | void * pc; |
| 83 | |
Bruce Beare | 8e551a6 | 2011-03-28 09:47:35 -0700 | [diff] [blame] | 84 | #ifdef __i386__ |
| 85 | /* Get the eip from offset 12*4 = 48 as defined in the struct |
| 86 | * user_regs_struct in user_32.h |
| 87 | */ |
| 88 | pc = (void *)ptrace(PTRACE_PEEKUSR, handle->tid, (void *)48 /* eip */, NULL); |
| 89 | /* FIXME - pc is a non-decremented breakpoint address, hence the |
| 90 | * addition of 1 on test. This seems to work for the thread hook |
| 91 | * function in libc.so but should be properly fixed. |
| 92 | */ |
| 93 | if (pc == ((int)bkpt_addr + 1)) { |
| 94 | /* The hook function takes the id of the new thread as it's first |
| 95 | * param, so grab it from ecx at offset 4 in struct user_regs_struct |
| 96 | * (using fastcall convention for x86) |
| 97 | */ |
| 98 | gEventMsgHandle.pid = ptrace(PTRACE_PEEKUSR, handle->tid, (void *)4 /* ecx */, NULL); |
| 99 | gEventMsgHandle.tid = gEventMsgHandle.pid; |
| 100 | return 0x42; |
| 101 | } |
Chris Dearman | 726800e | 2012-05-01 17:45:53 -0700 | [diff] [blame] | 102 | #elif defined(__arm__) |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 103 | pc = (void *)ptrace(PTRACE_PEEKUSR, handle->tid, (void *)60 /* r15/pc */, NULL); |
| 104 | |
| 105 | if (pc == bkpt_addr) { |
| 106 | // The hook function takes the id of the new thread as it's first param, |
| 107 | // so grab it from r0. |
| 108 | gEventMsgHandle.pid = ptrace(PTRACE_PEEKUSR, handle->tid, (void *)0 /* r0 */, NULL); |
| 109 | gEventMsgHandle.tid = gEventMsgHandle.pid; |
| 110 | return 0x42; |
| 111 | } |
Chris Dearman | 726800e | 2012-05-01 17:45:53 -0700 | [diff] [blame] | 112 | #elif defined(__mips__) |
| 113 | pc = (void *)ptrace(PTRACE_PEEKUSR, handle->tid, (void *)(64*4) /* pc */, NULL); |
| 114 | if (pc == bkpt_addr) { |
| 115 | // The hook function takes the id of the new thread as it's first param, |
| 116 | // so grab it from a0 |
| 117 | gEventMsgHandle.pid = ptrace(PTRACE_PEEKUSR, handle->tid, (void *)(4*4) /* a0 */, NULL); |
| 118 | gEventMsgHandle.tid = gEventMsgHandle.pid; |
| 119 | return 0x42; |
| 120 | } |
Bruce Beare | 8e551a6 | 2011-03-28 09:47:35 -0700 | [diff] [blame] | 121 | #endif |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 122 | return 0; |
| 123 | } |
| 124 | |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 125 | /* NOTE: not used by gdb 7.0 */ |
| 126 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 127 | td_err_e |
| 128 | td_ta_event_getmsg(td_thragent_t const * agent, td_event_msg_t * event) |
| 129 | { |
| 130 | td_err_e err; |
| 131 | void * bkpt_addr; |
| 132 | |
| 133 | err = ps_pglobal_lookup(NULL, NULL, gSymbols[SYM_TD_CREATE], &bkpt_addr); |
| 134 | if (err) { |
| 135 | return err; |
| 136 | } |
| 137 | |
| 138 | err = td_ta_thr_iter(agent, _event_getmsg_helper, bkpt_addr, 0, 0, NULL, 0); |
| 139 | if (err != 0x42) { |
| 140 | return TD_NOMSG; |
| 141 | } |
| 142 | |
| 143 | event->event = TD_CREATE; |
| 144 | event->th_p = &gEventMsgHandle; // Nasty hack, but it's the only way! |
| 145 | |
| 146 | return TD_OK; |
| 147 | } |
| 148 | |
| 149 | |
| 150 | td_err_e |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 151 | td_ta_map_lwp2thr(td_thragent_t const * agent, lwpid_t lwpid, |
| 152 | td_thrhandle_t *th) |
| 153 | { |
| 154 | th->pid = ps_getpid(agent->ph); |
| 155 | th->tid = lwpid; |
| 156 | return TD_OK; |
| 157 | } |
| 158 | |
| 159 | |
| 160 | td_err_e |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 161 | td_thr_get_info(td_thrhandle_t const * handle, td_thrinfo_t * info) |
| 162 | { |
| 163 | info->ti_tid = handle->tid; |
Elliott Hughes | 40eabe2 | 2013-02-14 18:59:37 -0800 | [diff] [blame] | 164 | info->ti_lid = handle->tid; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 165 | info->ti_state = TD_THR_SLEEP; /* XXX this needs to be read from /proc/<pid>/task/<tid>. |
| 166 | This is only used to see if the thread is a zombie or not */ |
| 167 | return TD_OK; |
| 168 | } |
| 169 | |
| 170 | |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 171 | /* NOTE: not used by gdb 7.0 */ |
| 172 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 173 | td_err_e |
| 174 | td_thr_event_enable(td_thrhandle_t const * handle, td_event_e event) |
| 175 | { |
| 176 | // I don't think we need to do anything here... |
| 177 | return TD_OK; |
| 178 | } |
| 179 | |
| 180 | |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 181 | /* NOTE: not used by gdb 7.0 */ |
| 182 | |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 183 | td_err_e |
| 184 | td_ta_event_addr(td_thragent_t const * agent, td_event_e event, td_notify_t * notify_out) |
| 185 | { |
| 186 | int32_t err; |
| 187 | |
Bruce Beare | 8e551a6 | 2011-03-28 09:47:35 -0700 | [diff] [blame] | 188 | /* |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 189 | * This is nasty, ps_pglobal_lookup is implemented in gdbserver and looks up |
| 190 | * the symbol from it's cache, which is populated at start time with the |
| 191 | * symbols returned from td_symbol_list via calls back to the host. |
| 192 | */ |
| 193 | |
| 194 | switch (event) { |
| 195 | case TD_CREATE: |
| 196 | err = ps_pglobal_lookup(NULL, NULL, gSymbols[SYM_TD_CREATE], ¬ify_out->u.bptaddr); |
| 197 | if (err) { |
| 198 | return TD_NOEVENT; |
| 199 | } |
| 200 | return TD_OK; |
| 201 | } |
| 202 | return TD_NOEVENT; |
| 203 | } |
| 204 | |
| 205 | |
| 206 | td_err_e |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 207 | td_ta_clear_event(const td_thragent_t * ta_arg, td_thr_events_t * event) |
| 208 | { |
| 209 | /* Given that gdb 7.0 doesn't use thread events, |
| 210 | there's nothing we need to do here. */ |
| 211 | return TD_OK; |
| 212 | } |
| 213 | |
| 214 | |
| 215 | td_err_e |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 216 | td_ta_thr_iter(td_thragent_t const * agent, td_thr_iter_f * func, void * cookie, |
| 217 | td_thr_state_e state, int32_t prio, sigset_t * sigmask, uint32_t user_flags) |
| 218 | { |
| 219 | td_err_e err = TD_OK; |
| 220 | char path[32]; |
| 221 | DIR * dir; |
| 222 | struct dirent * entry; |
| 223 | td_thrhandle_t handle; |
| 224 | |
| 225 | snprintf(path, sizeof(path), "/proc/%d/task/", agent->pid); |
| 226 | dir = opendir(path); |
| 227 | if (!dir) { |
| 228 | return TD_NOEVENT; |
| 229 | } |
| 230 | |
| 231 | handle.pid = agent->pid; |
| 232 | while ((entry = readdir(dir)) != NULL) { |
| 233 | if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) { |
| 234 | continue; |
| 235 | } |
| 236 | handle.tid = atoi(entry->d_name); |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 237 | if (func(&handle, cookie) != 0) { |
| 238 | err = TD_DBERR; |
The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 239 | break; |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | closedir(dir); |
| 244 | |
| 245 | return err; |
| 246 | } |
| 247 | |
David 'Digit' Turner | 3d4edfc | 2010-03-19 16:01:28 -0700 | [diff] [blame] | 248 | td_err_e |
| 249 | td_thr_tls_get_addr(const td_thrhandle_t * th, |
| 250 | psaddr_t map_address, size_t offset, psaddr_t * address) |
| 251 | { |
| 252 | return TD_NOAPLIC; // FIXME: TODO |
| 253 | } |