diff options
Diffstat (limited to 'gdb/arm-tdep.c')
| -rw-r--r-- | gdb/arm-tdep.c | 67 |
1 files changed, 45 insertions, 22 deletions
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c index 4ce7183..b4d2211 100644 --- a/gdb/arm-tdep.c +++ b/gdb/arm-tdep.c @@ -2358,38 +2358,24 @@ arm_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc) return 1; } -/* Return non-zero if the PC is inside a thumb call thunk. */ - -int -arm_in_call_stub (CORE_ADDR pc, char *name) -{ - CORE_ADDR start_addr; - - /* Find the starting address of the function containing the PC. If - the caller didn't give us a name, look it up at the same time. */ - if (0 == find_pc_partial_function (pc, name ? NULL : &name, - &start_addr, NULL)) - return 0; - - return strncmp (name, "_call_via_r", 11) == 0; -} - -/* If PC is in a Thumb call or return stub, return the address of the - target PC, which is in a register. The thunk functions are called - _called_via_xx, where x is the register name. The possible names - are r0-r9, sl, fp, ip, sp, and lr. */ +/* Recognize GCC and GNU ld's trampolines. If we are in a trampoline, + return the target PC. Otherwise return 0. */ CORE_ADDR arm_skip_stub (struct frame_info *frame, CORE_ADDR pc) { char *name; + int namelen; CORE_ADDR start_addr; /* Find the starting address and name of the function containing the PC. */ if (find_pc_partial_function (pc, &name, &start_addr, NULL) == 0) return 0; - /* Call thunks always start with "_call_via_". */ + /* If PC is in a Thumb call or return stub, return the address of the + target PC, which is in a register. The thunk functions are called + _call_via_xx, where x is the register name. The possible names + are r0-r9, sl, fp, ip, sp, and lr. */ if (strncmp (name, "_call_via_", 10) == 0) { /* Use the name suffix to determine which register contains the @@ -2399,12 +2385,49 @@ arm_skip_stub (struct frame_info *frame, CORE_ADDR pc) "r8", "r9", "sl", "fp", "ip", "sp", "lr" }; int regno; + int offset = strlen (name) - 2; for (regno = 0; regno <= 14; regno++) - if (strcmp (&name[10], table[regno]) == 0) + if (strcmp (&name[offset], table[regno]) == 0) return get_frame_register_unsigned (frame, regno); } + /* GNU ld generates __foo_from_arm or __foo_from_thumb for + non-interworking calls to foo. We could decode the stubs + to find the target but it's easier to use the symbol table. */ + namelen = strlen (name); + if (name[0] == '_' && name[1] == '_' + && ((namelen > 2 + strlen ("_from_thumb") + && strncmp (name + namelen - strlen ("_from_thumb"), "_from_thumb", + strlen ("_from_thumb")) == 0) + || (namelen > 2 + strlen ("_from_arm") + && strncmp (name + namelen - strlen ("_from_arm"), "_from_arm", + strlen ("_from_arm")) == 0))) + { + char *target_name; + int target_len = namelen - 2; + struct minimal_symbol *minsym; + struct objfile *objfile; + struct obj_section *sec; + + if (name[namelen - 1] == 'b') + target_len -= strlen ("_from_thumb"); + else + target_len -= strlen ("_from_arm"); + + target_name = alloca (target_len + 1); + memcpy (target_name, name + 2, target_len); + target_name[target_len] = '\0'; + + sec = find_pc_section (pc); + objfile = (sec == NULL) ? NULL : sec->objfile; + minsym = lookup_minimal_symbol (target_name, NULL, objfile); + if (minsym != NULL) + return SYMBOL_VALUE_ADDRESS (minsym); + else + return 0; + } + return 0; /* not a stub */ } |