diff options
Diffstat (limited to 'gdb/i386-linux-tdep.c')
| -rw-r--r-- | gdb/i386-linux-tdep.c | 61 |
1 files changed, 26 insertions, 35 deletions
diff --git a/gdb/i386-linux-tdep.c b/gdb/i386-linux-tdep.c index 2fe4d0481a9..30a8e6a4a04 100644 --- a/gdb/i386-linux-tdep.c +++ b/gdb/i386-linux-tdep.c @@ -239,50 +239,41 @@ i386_linux_pc_in_sigtramp (CORE_ADDR pc, char *name) || strcmp ("__restore_rt", name) == 0); } -/* Assuming FRAME is for a GNU/Linux sigtramp routine, return the - address of the associated sigcontext structure. */ +/* Assuming NEXT_FRAME is a frame following a GNU/Linux sigtramp + routine, return the address of the associated sigcontext structure. */ static CORE_ADDR -i386_linux_sigcontext_addr (struct frame_info *frame) +i386_linux_sigcontext_addr (struct frame_info *next_frame) { CORE_ADDR pc; + CORE_ADDR sp; + char buf[4]; - pc = i386_linux_sigtramp_start (get_frame_pc (frame)); + frame_unwind_register (next_frame, SP_REGNUM, buf); + sp = extract_address (buf, 4); + + pc = i386_linux_sigtramp_start (frame_pc_unwind (next_frame)); if (pc) { - CORE_ADDR sp; - - if (get_next_frame (frame)) - /* If this isn't the top frame, the next frame must be for the - signal handler itself. The sigcontext structure lives on - the stack, right after the signum argument. */ - return get_frame_base (get_next_frame (frame)) + 12; - - /* This is the top frame. We'll have to find the address of the - sigcontext structure by looking at the stack pointer. Keep - in mind that the first instruction of the sigtramp code is - "pop %eax". If the PC is at this instruction, adjust the - returned value accordingly. */ - sp = read_register (SP_REGNUM); - if (pc == get_frame_pc (frame)) + /* The sigcontext structure lives on the stack, right after + the signum argument. We determine the address of the + sigcontext structure by looking at the frame's stack + pointer. Keep in mind that the first instruction of the + sigtramp code is "pop %eax". If the PC is after this + instruction, adjust the returned value accordingly. */ + if (pc == frame_pc_unwind (next_frame)) return sp + 4; return sp; } - pc = i386_linux_rt_sigtramp_start (get_frame_pc (frame)); + pc = i386_linux_rt_sigtramp_start (frame_pc_unwind (next_frame)); if (pc) { - if (get_next_frame (frame)) - /* If this isn't the top frame, the next frame must be for the - signal handler itself. The sigcontext structure is part of - the user context. A pointer to the user context is passed - as the third argument to the signal handler. */ - return read_memory_integer (get_frame_base (get_next_frame (frame)) - + 16, 4) + 20; - - /* This is the top frame. Again, use the stack pointer to find - the address of the sigcontext structure. */ - return read_memory_integer (read_register (SP_REGNUM) + 8, 4) + 20; + /* The sigcontext structure is part of the user context. A + pointer to the user context is passed as the third argument + to the signal handler. */ + read_memory (sp + 8, 4, buf); + return extract_address (buf, 4) + 20; } error ("Couldn't recognize signal trampoline."); @@ -345,9 +336,9 @@ find_minsym_and_objfile (char *name, struct objfile **objfile_p) } static CORE_ADDR -skip_hurd_resolver (CORE_ADDR pc) +skip_gnu_resolver (CORE_ADDR pc) { - /* The HURD dynamic linker is part of the GNU C library, so many + /* The GNU dynamic linker is part of the GNU C library, so many GNU/Linux distributions use it. (All ELF versions, as far as I know.) An unresolved PLT entry points to "_dl_runtime_resolve", which calls "fixup" to patch the PLT, and then passes control to @@ -374,7 +365,7 @@ skip_hurd_resolver (CORE_ADDR pc) = lookup_minimal_symbol ("fixup", NULL, objfile); if (fixup && SYMBOL_VALUE_ADDRESS (fixup) == pc) - return (DEPRECATED_SAVED_PC_AFTER_CALL (get_current_frame ())); + return frame_pc_unwind (get_current_frame ()); } return 0; @@ -393,7 +384,7 @@ i386_linux_skip_solib_resolver (CORE_ADDR pc) CORE_ADDR result; /* Plug in functions for other kinds of resolvers here. */ - result = skip_hurd_resolver (pc); + result = skip_gnu_resolver (pc); if (result) return result; |