Tue Nov 5 10:21:02 1996 Michael Snyder <msnyder@cleaver.cygnus.com>
* m32r-tdep.c: Improved frame_chain and fn prologue analysis. * config/tm-m32r.h: Add framesize and register to extra_frame_info.
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start-sanitize-m32r
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Tue Nov 5 10:21:02 1996 Michael Snyder <msnyder@cleaver.cygnus.com>
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* m32r-tdep.c: Improved frame_chain and fn prologue analysis.
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* config/tm-m32r.h: Add framesize and register to extra_frame_info.
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end-sanitize-m32r
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Tue Nov 5 10:08:07 1996 Stu Grossman (grossman@critters.cygnus.com)
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* mswin/gdbwin.h: Remove bogus definition of CORE_ADDR.
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@ -92,13 +92,18 @@ struct type;
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struct value;
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#endif
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/* #define EXTRA_FRAME_INFO struct frame_saved_regs fsr; */
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/* Define other aspects of the stack frame.
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we keep a copy of the worked out return pc lying around, since it
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is a useful bit of info */
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We keep the offsets of all saved registers, 'cause we need 'em a lot!
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We also keep the current size of the stack frame, and whether
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the frame pointer is valid (for frameless functions, and when we're
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still in the prologue of a function with a frame) */
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/* mvs_check EXTRA_FRAME_INFO */
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#define EXTRA_FRAME_INFO struct frame_saved_regs fsr;
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#define EXTRA_FRAME_INFO \
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struct frame_saved_regs fsr; \
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int framesize; \
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int using_frame_pointer;
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extern void m32r_init_extra_frame_info PARAMS ((struct frame_info *fi));
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/* mvs_check INIT_EXTRA_FRAME_INFO */
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@ -93,9 +93,6 @@ m32r_scan_prologue (fi, fsr)
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/* this code essentially duplicates skip_prologue,
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but we need the start address below. */
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if (fsr)
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memset (fsr->regs, '\000', sizeof fsr->regs);
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if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end))
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{
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sal = find_pc_line (prologue_start, 0);
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@ -109,7 +106,7 @@ m32r_scan_prologue (fi, fsr)
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prologue_end = sal.end; /* (probably means no prologue) */
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}
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else
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prologue_end = prologue_start + 48; /* We're in the boondocks: allow for */
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prologue_end = prologue_start + 40; /* We're in the boondocks: allow for */
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/* 16 pushes, an add, and "mv fp,sp" */
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prologue_end = min (prologue_end, fi->pc);
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@ -149,15 +146,20 @@ m32r_scan_prologue (fi, fsr)
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insn &= 0x00ffffff; /* positive */
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framesize += insn;
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}
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else if (insn == 0x1d8f) /* mv fp, sp */
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break; /* end of stack adjustments */
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else if (insn == 0x1d8f) { /* mv fp, sp */
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fi->using_frame_pointer = 1; /* fp is now valid */
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break; /* end of stack adjustments */
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}
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else
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break; /* anything else isn't prologue */
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}
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return framesize;
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}
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/* This function actually figures out the frame address for a given pc and
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sp. This is tricky on the v850 because we only use an explicit frame
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pointer when using alloca(). The only reliable way to get this info is to
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sp. This is tricky on the m32r because we sometimes don't use an explicit
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frame pointer, and the previous stack pointer isn't necessarily recorded
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on the stack. The only reliable way to get this info is to
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examine the prologue.
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*/
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@ -166,23 +168,31 @@ m32r_init_extra_frame_info (fi)
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struct frame_info *fi;
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{
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int reg;
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int framesize;
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if (fi->next)
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fi->pc = FRAME_SAVED_PC (fi->next);
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framesize = m32r_scan_prologue (fi, &fi->fsr);
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memset (fi->fsr.regs, '\000', sizeof fi->fsr.regs);
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fi->using_frame_pointer = 0;
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fi->framesize = m32r_scan_prologue (fi, &fi->fsr);
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#if 0
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if (PC_IN_CALL_DUMMY (fi->pc, NULL, NULL))
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fi->frame = dummy_frame_stack->sp;
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else
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#endif
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if (!fi->next)
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fi->frame = read_register (SP_REGNUM);
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if (fi->using_frame_pointer)
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fi->frame = read_register (FP_REGNUM);
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else
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fi->frame = read_register (SP_REGNUM);
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else /* fi->next means this is not the innermost frame */
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if (fi->using_frame_pointer) /* we have an FP */
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if (fi->next->fsr.regs[FP_REGNUM] != 0) /* caller saved our FP */
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fi->frame = read_memory_integer (fi->next->fsr.regs[FP_REGNUM], 4);
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for (reg = 0; reg < NUM_REGS; reg++)
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if (fi->fsr.regs[reg] != 0)
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fi->fsr.regs[reg] = fi->frame + framesize - fi->fsr.regs[reg];
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fi->fsr.regs[reg] = fi->frame + fi->framesize - fi->fsr.regs[reg];
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}
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/* Find the caller of this frame. We do this by seeing if RP_REGNUM is saved
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@ -222,27 +232,19 @@ m32r_find_callers_reg (fi, regnum)
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/* Given a GDB frame, determine the address of the calling function's frame.
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This will be used to create a new GDB frame struct, and then
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INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
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For m32r, simply get the saved FP off the stack.
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For m32r, we save the frame size when we initialize the frame_info.
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*/
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CORE_ADDR
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m32r_frame_chain (fi)
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struct frame_info *fi;
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{
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CORE_ADDR saved_fp = fi->fsr.regs[FP_REGNUM];
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CORE_ADDR fn_start, fn_end;
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CORE_ADDR fn_start;
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if (saved_fp != 0)
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return read_memory_integer (saved_fp, 4);
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else {
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if (find_pc_partial_function (fi->pc, 0, &fn_start, &fn_end))
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if (fn_start == entry_point_address ())
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return 0; /* in _start fn, don't chain further */
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else
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return read_register (FP_REGNUM);
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else /* in the woods, what to do? */
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return 0; /* for now, play it safe and give up... */
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}
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if (find_pc_partial_function (fi->pc, 0, &fn_start, 0))
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if (fn_start == entry_point_address ())
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return 0; /* in _start fn, don't chain further */
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return fi->frame + fi->framesize;
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}
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/* All we do here is record SP and FP on the call dummy stack */
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