diff options
Diffstat (limited to 'gdb/i386-tdep.c')
| -rw-r--r-- | gdb/i386-tdep.c | 30 |
1 files changed, 28 insertions, 2 deletions
diff --git a/gdb/i386-tdep.c b/gdb/i386-tdep.c index 250d1c2..9739015 100644 --- a/gdb/i386-tdep.c +++ b/gdb/i386-tdep.c @@ -666,8 +666,8 @@ i386_frame_init_saved_regs (struct frame_info *fip) /* Return PC of first real instruction. */ -int -i386_skip_prologue (int pc) +CORE_ADDR +i386_skip_prologue (CORE_ADDR pc) { unsigned char op; int i; @@ -749,6 +749,24 @@ i386_skip_prologue (int pc) return (codestream_tell ()); } +/* Use the program counter to determine the contents and size of a + breakpoint instruction. Return a pointer to a string of bytes that + encode a breakpoint instruction, store the length of the string in + *LEN and optionally adjust *PC to point to the correct memory + location for inserting the breakpoint. + + On the i386 we have a single breakpoint that fits in a single byte + and can be inserted anywhere. */ + +static const unsigned char * +i386_breakpoint_from_pc (CORE_ADDR *pc, int *len) +{ + static unsigned char break_insn[] = { 0xcc }; /* int 3 */ + + *len = sizeof (break_insn); + return break_insn; +} + void i386_push_dummy_frame (void) { @@ -1402,6 +1420,14 @@ i386_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) set_gdbarch_use_struct_convention (gdbarch, i386_use_struct_convention); set_gdbarch_frame_init_saved_regs (gdbarch, i386_frame_init_saved_regs); + set_gdbarch_skip_prologue (gdbarch, i386_skip_prologue); + + /* Stack grows downward. */ + set_gdbarch_inner_than (gdbarch, core_addr_lessthan); + + set_gdbarch_breakpoint_from_pc (gdbarch, i386_breakpoint_from_pc); + set_gdbarch_decr_pc_after_break (gdbarch, 1); + set_gdbarch_function_start_offset (gdbarch, 0); /* The following redefines make backtracing through sigtramp work. They manufacture a fake sigtramp frame and obtain the saved pc in |