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Tue Oct 22 10:25:29 1996 Martin M. Hunt <hunt@pizza.cygnus.com>

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* d10v-tdep.c, config/d10v/tm-d10v.h: Changes to allow stack
 	backtraces and inferior function calls.
This commit is contained in:
Martin Hunt
1996-10-22 17:27:37 +00:00
parent 87dd0a9336
commit 3b1af95c73
1 changed files with 140 additions and 5 deletions
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145
gdb/d10v-tdep.c
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@ -26,6 +26,8 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#include "value.h"
#include "inferior.h"
#include "dis-asm.h"
#include "symfile.h"
#include "objfiles.h"
void d10v_frame_find_saved_regs PARAMS ((struct frame_info *fi, struct frame_saved_regs *fsr));
@ -42,7 +44,6 @@ d10v_pop_frame ()
char raw_buffer[8];
fp = FRAME_FP (frame);
/* fill out fsr with the address of where each */
/* register was stored in the frame */
get_frame_saved_regs (frame, &fsr);
@ -153,7 +154,16 @@ d10v_frame_chain (frame)
struct frame_info *frame;
{
struct frame_saved_regs fsr;
if (inside_entry_file (frame->pc))
return 0;
d10v_frame_find_saved_regs (frame, &fsr);
if (!fsr.regs[FP_REGNUM])
{
return (CORE_ADDR)fsr.regs[SP_REGNUM];
}
return read_memory_unsigned_integer(fsr.regs[FP_REGNUM],2);
}
@ -198,7 +208,7 @@ prologue_find_regs (op, fsr, addr)
/* mv r11, sp */
if (op == 0x417E)
return 1;
return 1;
/* nop */
if (op == 0x5E00)
@ -288,7 +298,7 @@ d10v_frame_find_saved_regs (fi, fsr)
fi->size = -next_addr;
for (i=0; i<NUM_REGS; i++)
for (i=0; i<NUM_REGS-1; i++)
if (fsr->regs[i])
{
fsr->regs[i] = fp - (next_addr - fsr->regs[i]);
@ -299,8 +309,16 @@ d10v_frame_find_saved_regs (fi, fsr)
else
fi->return_pc = (read_register(13) - 1) << 2;
/* th SP is not normally (ever?) saved, but check anyway */
if (!fsr->regs[SP_REGNUM])
fsr->regs[SP_REGNUM] = read_register(FP_REGNUM) + fi->size;
{
/* if the FP was saved, that means the current FP is valid, */
/* otherwise, it isn't being used, so we use the SP instead */
if (fsr->regs[FP_REGNUM])
fsr->regs[SP_REGNUM] = read_register(FP_REGNUM) + fi->size;
else
fsr->regs[SP_REGNUM] = read_register(SP_REGNUM) + fi->size;
}
}
void
@ -310,10 +328,15 @@ d10v_init_extra_frame_info (fromleaf, fi)
{
struct frame_saved_regs dummy;
if (fi->next && (fi->pc == 0))
if (fi->next && (fi->pc == 0))
fi->pc = fi->next->return_pc;
d10v_frame_find_saved_regs (fi, &dummy);
if (!dummy.regs[FP_REGNUM])
{
fi->frame = dummy.regs[SP_REGNUM] - fi->size;
d10v_frame_find_saved_regs (fi, &dummy);
}
}
static void
@ -396,3 +419,115 @@ d10v_write_register_pid (regno, val, pid)
write_register (regno, val);
inferior_pid = save_pid;
}
void
d10v_fix_call_dummy (dummyname, start_sp, fun, nargs, args, type, gcc_p)
char *dummyname;
CORE_ADDR start_sp;
CORE_ADDR fun;
int nargs;
value_ptr *args;
struct type *type;
int gcc_p;
{
int regnum, i;
CORE_ADDR sp;
char buffer[MAX_REGISTER_RAW_SIZE];
sp = start_sp;
for (regnum = 0; regnum < NUM_REGS-1; regnum++)
{
store_address (buffer, REGISTER_RAW_SIZE(regnum), read_register(regnum));
write_memory (sp, buffer, REGISTER_RAW_SIZE(regnum));
sp -= REGISTER_RAW_SIZE(regnum);
}
write_register (SP_REGNUM, (LONGEST)sp);
/* now we need to load PC with the return address */
write_register (PC_REGNUM, (LONGEST)d10v_call_dummy_address()>>2);
write_register (LR_REGNUM, (LONGEST)d10v_call_dummy_address()>>2);
target_store_registers (-1);
flush_cached_frames ();
}
CORE_ADDR
d10v_push_arguments (nargs, args, sp, struct_return, struct_addr)
int nargs;
value_ptr *args;
CORE_ADDR sp;
int struct_return;
CORE_ADDR struct_addr;
{
int i, len, regnum=2;
char *contents;
for (i = 0; i < nargs; i++)
{
value_ptr arg = args[i];
struct type *arg_type = check_typedef (VALUE_TYPE (arg));
switch (TYPE_CODE (arg_type))
{
case TYPE_CODE_INT:
case TYPE_CODE_BOOL:
case TYPE_CODE_CHAR:
case TYPE_CODE_RANGE:
case TYPE_CODE_ENUM:
break;
default:
break;
}
len = TYPE_LENGTH (arg_type);
contents = VALUE_CONTENTS(arg);
switch (len)
{
case 1:
write_register (regnum++, (LONGEST)(*contents));
break;
case 2:
write_register (regnum++, (LONGEST)(*(short *)contents));
break;
case 4:
{
LONGEST val = *(long *)contents;
write_register (regnum++, val >> 16 );
write_register (regnum++, val & 0xFFFF );
}
break;
default:
}
}
}
CORE_ADDR
d10v_call_dummy_address ()
{
CORE_ADDR entry, retval;
struct minimal_symbol *sym;
entry = entry_point_address ();
if (entry != 0)
{
return entry;
}
sym = lookup_minimal_symbol ("_start", NULL, symfile_objfile);
if (!sym || MSYMBOL_TYPE (sym) != mst_text)
retval = 0;
else
retval = SYMBOL_VALUE_ADDRESS (sym);
return retval;
}
/* Given a return value in `regbuf' with a type `valtype',
extract and copy its value into `valbuf'. */
void
d10v_extract_return_value (valtype, regbuf, valbuf)
struct type *valtype;
char regbuf[REGISTER_BYTES];
char *valbuf;
{
memcpy (valbuf, regbuf + REGISTER_BYTE (2), TYPE_LENGTH (valtype));
}