From 7f8e742495d482de373f6414b11e0f5a81c6199a Mon Sep 17 00:00:00 2001 From: Grace Sainsbury Date: Fri, 21 Jun 2002 14:56:18 +0000 Subject: Replaced frame_find_saved_regs with frame_init_saved_regs. Converted call dummy macros to multi-arch. --- gdb/m68k-tdep.c | 97 +++++++++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 73 insertions(+), 24 deletions(-) (limited to 'gdb/m68k-tdep.c') diff --git a/gdb/m68k-tdep.c b/gdb/m68k-tdep.c index 05a3e50..2ddb1eb 100644 --- a/gdb/m68k-tdep.c +++ b/gdb/m68k-tdep.c @@ -41,6 +41,8 @@ #define P_FMOVM 0xf237 #define P_TRAP 0x4e40 +void m68k_frame_init_saved_regs (struct frame_info *frame_info); + /* The only reason this is here is the tm-altos.h reference below. It was moved back here from tm-m68k.h. FIXME? */ @@ -166,6 +168,19 @@ news_frame_num_args (struct frame_info *fi) return val; } +/* Insert the specified number of args and function address + into a call sequence of the above form stored at DUMMYNAME. + We use the BFD routines to store a big-endian value of known size. */ + +void +m68k_fix_call_dummy(char *dummy, CORE_ADDR pc, CORE_ADDR fun, int nargs, + struct value **args, struct type *type, int gcc_p) +{ + bfd_putb32 (fun, (unsigned char *) dummy + CALL_DUMMY_START_OFFSET + 2); + bfd_putb32 (nargs*4, (unsigned char *) dummy + CALL_DUMMY_START_OFFSET + 8); +} + + /* Push an empty stack frame, to record the current PC, etc. */ void @@ -204,30 +219,29 @@ m68k_pop_frame (void) register struct frame_info *frame = get_current_frame (); register CORE_ADDR fp; register int regnum; - struct frame_saved_regs fsr; char raw_buffer[12]; fp = FRAME_FP (frame); - get_frame_saved_regs (frame, &fsr); + m68k_frame_init_saved_regs (frame); for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) { - if (fsr.regs[regnum]) + if (frame->saved_regs[regnum]) { - read_memory (fsr.regs[regnum], raw_buffer, 12); + read_memory (frame->saved_regs[regnum], raw_buffer, 12); write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); } } for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) { - if (fsr.regs[regnum]) + if (frame->saved_regs[regnum]) { - write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); + write_register (regnum, read_memory_integer (frame->saved_regs[regnum], 4)); } } - if (fsr.regs[PS_REGNUM]) + if (frame->saved_regs[PS_REGNUM]) { write_register (PS_REGNUM, - read_memory_integer (fsr.regs[PS_REGNUM], 4)); + read_memory_integer (frame->saved_regs[PS_REGNUM], 4)); } write_register (FP_REGNUM, read_memory_integer (fp, 4)); write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); @@ -304,9 +318,14 @@ m68k_skip_prologue (CORE_ADDR ip) return (ip); } +/* Store the addresses of the saved registers of the frame described by + FRAME_INFO in its saved_regs field. + This includes special registers such as pc and fp saved in special + ways in the stack frame. sp is even more special: + the address we return for it IS the sp for the next frame. */ + void -m68k_find_saved_regs (struct frame_info *frame_info, - struct frame_saved_regs *saved_regs) +m68k_frame_init_saved_regs (struct frame_info *frame_info) { register int regnum; register int regmask; @@ -315,10 +334,17 @@ m68k_find_saved_regs (struct frame_info *frame_info, /* First possible address for a pc in a call dummy for this frame. */ CORE_ADDR possible_call_dummy_start = - (frame_info)->frame - CALL_DUMMY_LENGTH - FP_REGNUM * 4 - 4 - 8 * 12; + (frame_info)->frame - 28 - FP_REGNUM * 4 - 4 - 8 * 12; int nextinsn; - memset (saved_regs, 0, sizeof (*saved_regs)); + + if (frame_info->saved_regs) + return; + + frame_saved_regs_zalloc (frame_info); + + memset (frame_info->saved_regs, 0, SIZEOF_FRAME_SAVED_REGS); + if ((frame_info)->pc >= possible_call_dummy_start && (frame_info)->pc <= (frame_info)->frame) { @@ -378,7 +404,7 @@ m68k_find_saved_regs (struct frame_info *frame_info, /* Regmask's low bit is for register fp7, the first pushed */ for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) if (regmask & 1) - saved_regs->regs[regnum] = (next_addr -= 12); + frame_info->saved_regs[regnum] = (next_addr -= 12); pc += 4; } /* fmovemx to (fp + displacement) */ @@ -391,7 +417,7 @@ m68k_find_saved_regs (struct frame_info *frame_info, for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) if (regmask & 1) { - saved_regs->regs[regnum] = addr; + frame_info->saved_regs[regnum] = addr; addr += 12; } pc += 6; @@ -403,7 +429,7 @@ m68k_find_saved_regs (struct frame_info *frame_info, for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) if (regmask & 1) { - saved_regs->regs[regnum] = next_addr; + frame_info->saved_regs[regnum] = next_addr; next_addr += 4; } pc += 4; @@ -418,7 +444,7 @@ m68k_find_saved_regs (struct frame_info *frame_info, for (regnum = 0; regnum < 16; regnum++, regmask >>= 1) if (regmask & 1) { - saved_regs->regs[regnum] = addr; + frame_info->saved_regs[regnum] = addr; addr += 4; } pc += 6; @@ -429,14 +455,14 @@ m68k_find_saved_regs (struct frame_info *frame_info, /* Regmask's low bit is for register 15, the first pushed */ for (regnum = 16; --regnum >= 0; regmask >>= 1) if (regmask & 1) - saved_regs->regs[regnum] = (next_addr -= 4); + frame_info->saved_regs[regnum] = (next_addr -= 4); pc += 4; } /* movl r,-(sp) */ else if (0x2f00 == (0xfff0 & nextinsn)) { regnum = 0xf & nextinsn; - saved_regs->regs[regnum] = (next_addr -= 4); + frame_info->saved_regs[regnum] = (next_addr -= 4); pc += 2; } /* fmovemx to index of sp */ @@ -446,7 +472,7 @@ m68k_find_saved_regs (struct frame_info *frame_info, for (regnum = FP0_REGNUM + 8; --regnum >= FP0_REGNUM; regmask >>= 1) if (regmask & 1) { - saved_regs->regs[regnum] = next_addr; + frame_info->saved_regs[regnum] = next_addr; next_addr += 12; } pc += 10; @@ -454,20 +480,21 @@ m68k_find_saved_regs (struct frame_info *frame_info, /* clrw -(sp); movw ccr,-(sp) */ else if (0x4267 == nextinsn && 0x42e7 == regmask) { - saved_regs->regs[PS_REGNUM] = (next_addr -= 4); + frame_info->saved_regs[PS_REGNUM] = (next_addr -= 4); pc += 4; } else break; } lose:; - saved_regs->regs[SP_REGNUM] = (frame_info)->frame + 8; - saved_regs->regs[FP_REGNUM] = (frame_info)->frame; - saved_regs->regs[PC_REGNUM] = (frame_info)->frame + 4; + frame_info->saved_regs[SP_REGNUM] = (frame_info)->frame + 8; + frame_info->saved_regs[FP_REGNUM] = (frame_info)->frame; + frame_info->saved_regs[PC_REGNUM] = (frame_info)->frame + 4; #ifdef SIG_SP_FP_OFFSET /* Adjust saved SP_REGNUM for fake _sigtramp frames. */ if (frame_info->signal_handler_caller && frame_info->next) - saved_regs->regs[SP_REGNUM] = frame_info->next->frame + SIG_SP_FP_OFFSET; + frame_info->saved_regs[SP_REGNUM] = + frame_info->next->frame + SIG_SP_FP_OFFSET; #endif } @@ -684,6 +711,9 @@ m68k_saved_pc_after_call (struct frame_info *frame) static struct gdbarch * m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) { + static LONGEST call_dummy_words[7] = {0xf227e0ff, 0x48e7fffc, 0x426742e7, + 0x4eb93232, 0x3232dffc, 0x69696969, + (0x4e404e71 | (BPT_VECTOR << 16))}; struct gdbarch_tdep *tdep = NULL; struct gdbarch *gdbarch; @@ -698,6 +728,25 @@ m68k_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) gdbarch = gdbarch_alloc (&info, 0); + set_gdbarch_frame_init_saved_regs (gdbarch, m68k_frame_init_saved_regs); + + set_gdbarch_use_generic_dummy_frames (gdbarch, 0); + set_gdbarch_call_dummy_location (gdbarch, ON_STACK); + set_gdbarch_call_dummy_breakpoint_offset_p (gdbarch, 1); + set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 24); + set_gdbarch_pc_in_call_dummy (gdbarch, pc_in_call_dummy_on_stack); + set_gdbarch_call_dummy_p (gdbarch, 1); + set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); + set_gdbarch_call_dummy_length (gdbarch, 28); + set_gdbarch_call_dummy_start_offset (gdbarch, 12); + + set_gdbarch_call_dummy_words (gdbarch, call_dummy_words); + set_gdbarch_sizeof_call_dummy_words (gdbarch, sizeof (call_dummy_words)); + set_gdbarch_call_dummy_stack_adjust_p (gdbarch, 0); + set_gdbarch_fix_call_dummy (gdbarch, m68k_fix_call_dummy); + set_gdbarch_push_dummy_frame (gdbarch, m68k_push_dummy_frame); + set_gdbarch_pop_frame (gdbarch, m68k_pop_frame); + return gdbarch; } -- cgit v1.1