diff options
Diffstat (limited to 'gdb/alpha-tdep.c')
| -rw-r--r-- | gdb/alpha-tdep.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/gdb/alpha-tdep.c b/gdb/alpha-tdep.c index 4bec6bcbfe9..81c932c57b9 100644 --- a/gdb/alpha-tdep.c +++ b/gdb/alpha-tdep.c @@ -78,6 +78,8 @@ static gdbarch_fix_call_dummy_ftype alpha_fix_call_dummy; static gdbarch_init_frame_pc_first_ftype alpha_init_frame_pc_first; static gdbarch_init_extra_frame_info_ftype alpha_init_extra_frame_info; +static gdbarch_get_longjmp_target_ftype alpha_get_longjmp_target; + struct frame_extra_info { alpha_extra_func_info_t proc_desc; @@ -1617,6 +1619,28 @@ alpha_extract_struct_value_address (char *regbuf) REGISTER_RAW_SIZE (ALPHA_V0_REGNUM))); } +/* Figure out where the longjmp will land. + We expect the first arg to be a pointer to the jmp_buf structure from + which we extract the PC (JB_PC) that we will land at. The PC is copied + into the "pc". This routine returns true on success. */ + +static int +alpha_get_longjmp_target (CORE_ADDR *pc) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); + CORE_ADDR jb_addr; + char raw_buffer[ALPHA_MAX_REGISTER_RAW_SIZE]; + + jb_addr = read_register (ALPHA_A0_REGNUM); + + if (target_read_memory (jb_addr + (tdep->jb_pc * tdep->jb_elt_size), + raw_buffer, tdep->jb_elt_size)) + return 0; + + *pc = extract_address (raw_buffer, tdep->jb_elt_size); + return 1; +} + /* alpha_software_single_step() is called just before we want to resume the inferior, if we want to single-step it but there is no hardware or kernel single-step support (NetBSD on Alpha, for example). We find @@ -1975,6 +1999,8 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) tdep->dynamic_sigtramp_offset = NULL; tdep->skip_sigtramp_frame = NULL; + tdep->jb_pc = -1; /* longjmp support not enabled by default */ + /* Type sizes */ set_gdbarch_short_bit (gdbarch, 16); set_gdbarch_int_bit (gdbarch, 32); @@ -2113,6 +2139,12 @@ alpha_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) } } + /* Now that we have tuned the configuration, set a few final things + based on what the OS ABI has told us. */ + + if (tdep->jb_pc >= 0) + set_gdbarch_get_longjmp_target (gdbarch, alpha_get_longjmp_target); + return gdbarch; } @@ -2134,6 +2166,13 @@ alpha_dump_tdep (struct gdbarch *current_gdbarch, struct ui_file *file) fprintf_unfiltered (file, "alpha_dump_tdep: vm_min_address = 0x%lx\n", (long) tdep->vm_min_address); + + fprintf_unfiltered (file, + "alpha_dump_tdep: jb_pc = %d\n", + tdep->jb_pc); + fprintf_unfiltered (file, + "alpha_dump_tdep: jb_elt_size = %ld\n", + (long) tdep->jb_elt_size); } void |