CORE_ADDR
microblaze_frame_saved_pc (struct frame_info * fi)
{
if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM);
else
return microblaze_find_callers_reg (fi, PR_REGNUM);
/* return microblaze_find_callers_reg (fi, PC_REGNUM); */
}
int
generic_file_frame_chain_valid (CORE_ADDR fp, struct frame_info *fi)
{
if (PC_IN_CALL_DUMMY (FRAME_SAVED_PC (fi), fp, fp))
return 1; /* don't prune CALL_DUMMY frames */
else /* fall back to default algorithm (see frame.h) */
return (fp != 0
&& (INNER_THAN (fi->frame, fp) || fi->frame == fp)
&& !inside_entry_file (FRAME_SAVED_PC (fi)));
}
void
generic_pop_current_frame (void (*popper) (struct frame_info * frame))
{
struct frame_info *frame = get_current_frame ();
if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
generic_pop_dummy_frame ();
else
(*popper) (frame);
}
void
microblaze_pop_frame (struct frame_info *fi)
{
int rn;
CORE_ADDR func_addr, func_end, addr;
enum microblaze_instr op;
int insn, rd, ra, rb, imm;
int status;
char *name;
int offset = 0; /* offset that the return instruction specifies */
/* Find the start and end of this function. */
/* siva/9/19/05: pop frame was not computing this offset. copied code from
microblaze_fix_call_dummy to find the return insn & the offset */
status = find_pc_partial_function (fi->pc, &name, &func_addr, &func_end);
for (addr = func_addr; addr < func_end; addr += INST_WORD_SIZE) {
/* Start decoding the function looking for rtsd */
insn = get_insn (addr);
op = microblaze_decode_insn (insn, &rd, &ra, &rb, &imm);
/* Check for return. */
if (IS_RETURN(op)) {
offset = imm;
break;
}
}
if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
generic_pop_dummy_frame ();
else
{
/* Write out the PC we saved. */
write_register (PC_REGNUM, FRAME_SAVED_PC (fi) + offset);
/* Restore any saved registers. */
for (rn = 0; rn < NUM_REGS; rn++)
{
if (fi->saved_regs[rn] != 0)
{
ULONGEST value;
value = read_memory_unsigned_integer (fi->saved_regs[rn],
REGISTER_SIZE);
write_register (rn, value);
}
}
/* Actually cut back the stack. */
write_register (SP_REGNUM, FRAME_FP (fi));
}
/* Finally, throw away any cached frame information. */
flush_cached_frames ();
}
CORE_ADDR
microblaze_find_callers_reg (struct frame_info *fi, int regnum)
{
LONGEST ret;
for (; fi != NULL; fi = fi->next)
{
if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
return generic_read_register_dummy (fi->pc, fi->frame, regnum);
else if (fi->saved_regs[regnum] != 0)
return microblaze_read_memory_integer (fi->saved_regs[regnum]);
}
return read_register (regnum);
}
int
inside_entry_file (CORE_ADDR addr)
{
if (addr == 0)
return 1;
if (symfile_objfile == 0)
return 0;
if (CALL_DUMMY_LOCATION == AT_ENTRY_POINT)
{
/* Do not stop backtracing if the pc is in the call dummy
at the entry point. */
/* FIXME: Won't always work with zeros for the last two arguments */
if (PC_IN_CALL_DUMMY (addr, 0, 0))
return 0;
}
return (addr >= symfile_objfile->ei.entry_file_lowpc &&
addr < symfile_objfile->ei.entry_file_highpc);
}
void
microblaze_init_extra_frame_info (struct frame_info *fi)
{
if (fi->next)
fi->pc = FRAME_SAVED_PC (fi->next);
frame_saved_regs_zalloc (fi);
fi->extra_info = (struct frame_extra_info *)
frame_obstack_alloc (sizeof (struct frame_extra_info));
fi->extra_info->status = 0;
fi->extra_info->framesize = 0;
if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame))
{
/* We need to setup fi->frame here because run_stack_dummy gets it wrong
by assuming it's always FP. */
fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM);
}
else
microblaze_analyze_prologue (fi, 0);
}
void
generic_get_saved_register (char *raw_buffer, int *optimized, CORE_ADDR *addrp,
struct frame_info *frame, int regnum,
enum lval_type *lval)
{
if (!target_has_registers)
error ("No registers.");
/* Normal systems don't optimize out things with register numbers. */
if (optimized != NULL)
*optimized = 0;
if (addrp) /* default assumption: not found in memory */
*addrp = 0;
/* Note: since the current frame's registers could only have been
saved by frames INTERIOR TO the current frame, we skip examining
the current frame itself: otherwise, we would be getting the
previous frame's registers which were saved by the current frame. */
while (frame && ((frame = frame->next) != NULL))
{
if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame))
{
if (lval) /* found it in a CALL_DUMMY frame */
*lval = not_lval;
if (raw_buffer)
memcpy (raw_buffer,
generic_find_dummy_frame (frame->pc, frame->frame) +
REGISTER_BYTE (regnum),
REGISTER_RAW_SIZE (regnum));
return;
}
FRAME_INIT_SAVED_REGS (frame);
if (frame->saved_regs != NULL
&& frame->saved_regs[regnum] != 0)
{
if (lval) /* found it saved on the stack */
*lval = lval_memory;
if (regnum == SP_REGNUM)
{
if (raw_buffer) /* SP register treated specially */
store_address (raw_buffer, REGISTER_RAW_SIZE (regnum),
frame->saved_regs[regnum]);
}
else
{
if (addrp) /* any other register */
*addrp = frame->saved_regs[regnum];
if (raw_buffer)
read_memory (frame->saved_regs[regnum], raw_buffer,
REGISTER_RAW_SIZE (regnum));
}
return;
}
}
/* If we get thru the loop to this point, it means the register was
not saved in any frame. Return the actual live-register value. */
if (lval) /* found it in a live register */
*lval = lval_register;
if (addrp)
*addrp = REGISTER_BYTE (regnum);
if (raw_buffer)
read_register_gen (regnum, raw_buffer);
}
