diff options
Diffstat (limited to 'gdb/mt-tdep.c')
| -rw-r--r-- | gdb/mt-tdep.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/gdb/mt-tdep.c b/gdb/mt-tdep.c index eb7ab11296f..f67ddfa719f 100644 --- a/gdb/mt-tdep.c +++ b/gdb/mt-tdep.c @@ -456,7 +456,7 @@ mt_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc) instruction in the instruction set. The BP for ms1 is defined as 0x68000000 (BREAK). - The BP for ms2 is defined as 0x69000000 (illegal) */ + The BP for ms2 is defined as 0x69000000 (illegal). */ static const gdb_byte * mt_breakpoint_from_pc (struct gdbarch *gdbarch, CORE_ADDR *bp_addr, @@ -483,7 +483,7 @@ mt_select_coprocessor (struct gdbarch *gdbarch, unsigned index, base; gdb_byte copro[4]; - /* Get the copro pseudo regnum. */ + /* Get the copro pseudo regnum. */ regcache_raw_read (regcache, MT_COPRO_REGNUM, copro); base = ((extract_signed_integer (&copro[0], 2, byte_order) * MT_COPRO_PSEUDOREG_DIM_2) @@ -877,7 +877,7 @@ mt_push_dummy_call (struct gdbarch *gdbarch, struct value *function, struct mt_unwind_cache { - /* The previous frame's inner most stack address. + /* The previous frame's inner most stack address. Used as this frame ID's stack_addr. */ CORE_ADDR prev_sp; CORE_ADDR frame_base; @@ -915,7 +915,7 @@ mt_frame_unwind_cache (struct frame_info *this_frame, info->frameless_p = 1; info->saved_regs = trad_frame_alloc_saved_regs (this_frame); - /* Grab the frame-relative values of SP and FP, needed below. + /* Grab the frame-relative values of SP and FP, needed below. The frame_saved_register function will find them on the stack or in the registers as appropriate. */ sp = get_frame_register_unsigned (this_frame, MT_SP_REGNUM); @@ -933,17 +933,17 @@ mt_frame_unwind_cache (struct frame_info *this_frame, for (next_addr = start_addr; next_addr < end_addr; next_addr += 4) { instr = get_frame_memory_unsigned (this_frame, next_addr, 4); - if (delayed_store) /* previous instr was a push */ + if (delayed_store) /* Previous instr was a push. */ { upper_half = delayed_store >> 16; regnum = upper_half & 0xf; offset = delayed_store & 0xffff; switch (upper_half & 0xfff0) { - case 0x43c0: /* push using frame pointer */ + case 0x43c0: /* push using frame pointer. */ info->saved_regs[regnum].addr = offset; break; - case 0x43d0: /* push using stack pointer */ + case 0x43d0: /* push using stack pointer. */ info->saved_regs[regnum].addr = offset; break; default: /* lint */ @@ -957,7 +957,8 @@ mt_frame_unwind_cache (struct frame_info *this_frame, case 0x12000000: /* NO-OP */ continue; case 0x12ddc000: /* copy sp into fp */ - info->frameless_p = 0; /* Record that the frame pointer is in use. */ + info->frameless_p = 0; /* Record that the frame + pointer is in use. */ continue; default: upper_half = instr >> 16; @@ -990,9 +991,9 @@ mt_frame_unwind_cache (struct frame_info *this_frame, keep scanning until we reach it (or we reach end_addr). */ if (prologue_end_addr && (prologue_end_addr > (next_addr + 4))) - continue; /* Keep scanning, recording saved_regs etc. */ + continue; /* Keep scanning, recording saved_regs etc. */ else - break; /* Quit scanning: breakpoint can be set here. */ + break; /* Quit scanning: breakpoint can be set here. */ } } @@ -1185,7 +1186,7 @@ mt_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) set_gdbarch_unwind_pc (gdbarch, mt_unwind_pc); set_gdbarch_unwind_sp (gdbarch, mt_unwind_sp); - /* Methods for saving / extracting a dummy frame's ID. + /* Methods for saving / extracting a dummy frame's ID. The ID's stack address must match the SP value returned by PUSH_DUMMY_CALL, and saved by generic_save_dummy_frame_tos. */ set_gdbarch_dummy_id (gdbarch, mt_dummy_id); |