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binutils-gdb/gdb/d10v-tdep.c
Martin Hunt 3b1af95c73 Tue Oct 22 10:25:29 1996 Martin M. Hunt <hunt@pizza.cygnus.com> 
* d10v-tdep.c, config/d10v/tm-d10v.h: Changes to allow stack
 	backtraces and inferior function calls.
1996-10-22 17:27:37 +00:00

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/* Target-dependent code for MItsubishi D10V, for GDB.
Copyright (C) 1996 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Contributed by Martin Hunt, hunt@cygnus.com */
#include "defs.h"
#include "frame.h"
#include "obstack.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "gdbcmd.h"
#include "gdbcore.h"
#include "gdb_string.h"
#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));
/* Discard from the stack the innermost frame,
restoring all saved registers. */
void
d10v_pop_frame ()
{
struct frame_info *frame = get_current_frame ();
CORE_ADDR fp;
int regnum;
struct frame_saved_regs fsr;
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);
/* now update the current registers with the old values */
for (regnum = A0_REGNUM; regnum < A0_REGNUM+2 ; regnum++)
{
if (fsr.regs[regnum])
{
read_memory (fsr.regs[regnum], raw_buffer, 8);
write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 8);
}
}
for (regnum = 0; regnum < SP_REGNUM; regnum++)
{
if (fsr.regs[regnum])
{
write_register (regnum, read_memory_unsigned_integer (fsr.regs[regnum], 2));
}
}
if (fsr.regs[PSW_REGNUM])
{
write_register (PSW_REGNUM, read_memory_unsigned_integer (fsr.regs[PSW_REGNUM], 2));
}
write_register (PC_REGNUM, read_register(13));
write_register (SP_REGNUM, fp + frame->size);
target_store_registers (-1);
flush_cached_frames ();
}
static int
check_prologue (op)
unsigned short op;
{
/* st rn, @-sp */
if ((op & 0x7E1F) == 0x6C1F)
return 1;
/* st2w rn, @-sp */
if ((op & 0x7E3F) == 0x6E1F)
return 1;
/* subi sp, n */
if ((op & 0x7FE1) == 0x01E1)
return 1;
/* mv r11, sp */
if (op == 0x417E)
return 1;
/* nop */
if (op == 0x5E00)
return 1;
/* st rn, @sp */
if ((op & 0x7E1F) == 0x681E)
return 1;
/* st2w rn, @sp */
if ((op & 0x7E3F) == 0x3A1E)
return 1;
return 0;
}
CORE_ADDR
d10v_skip_prologue (pc)
CORE_ADDR pc;
{
unsigned long op;
unsigned short op1, op2;
if (target_read_memory (pc, (char *)&op, 4))
return pc; /* Can't access it -- assume no prologue. */
while (1)
{
op = (unsigned long)read_memory_integer (pc, 4);
if ((op & 0xC0000000) == 0xC0000000)
{
/* long instruction */
if ( ((op & 0x3FFF0000) != 0x01FF0000) && /* add3 sp,sp,n */
((op & 0x3F0F0000) != 0x340F0000) && /* st rn, @(offset,sp) */
((op & 0x3F1F0000) != 0x350F0000)) /* st2w rn, @(offset,sp) */
break;
}
else
{
/* short instructions */
op1 = (op & 0x3FFF8000) >> 15;
op2 = op & 0x7FFF;
if (!check_prologue(op1) || !check_prologue(op2))
break;
}
pc += 4;
}
return pc;
}
/* Given a GDB frame, determine the address of the calling function's frame.
This will be used to create a new GDB frame struct, and then
INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
*/
CORE_ADDR
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);
}
static int next_addr;
static int
prologue_find_regs (op, fsr, addr)
unsigned short op;
struct frame_saved_regs *fsr;
CORE_ADDR addr;
{
int n;
/* st rn, @-sp */
if ((op & 0x7E1F) == 0x6C1F)
{
n = (op & 0x1E0) >> 5;
next_addr -= 2;
fsr->regs[n] = next_addr;
return 1;
}
/* st2w rn, @-sp */
else if ((op & 0x7E3F) == 0x6E1F)
{
n = (op & 0x1E0) >> 5;
next_addr -= 4;
fsr->regs[n] = next_addr;
fsr->regs[n+1] = next_addr+2;
return 1;
}
/* subi sp, n */
if ((op & 0x7FE1) == 0x01E1)
{
n = (op & 0x1E) >> 1;
if (n == 0)
n = 16;
next_addr -= n;
return 1;
}
/* mv r11, sp */
if (op == 0x417E)
return 1;
/* nop */
if (op == 0x5E00)
return 1;
/* st rn, @sp */
if ((op & 0x7E1F) == 0x681E)
{
n = (op & 0x1E0) >> 5;
fsr->regs[n] = next_addr;
return 1;
}
/* st2w rn, @sp */
if ((op & 0x7E3F) == 0x3A1E)
{
n = (op & 0x1E0) >> 5;
fsr->regs[n] = next_addr;
fsr->regs[n+1] = next_addr+2;
return 1;
}
return 0;
}
/* Put here the code to store, into a struct frame_saved_regs, the
addresses of the saved registers of frame described by FRAME_INFO.
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
d10v_frame_find_saved_regs (fi, fsr)
struct frame_info *fi;
struct frame_saved_regs *fsr;
{
CORE_ADDR fp, pc;
unsigned long op;
unsigned short op1, op2;
int i;
fp = fi->frame;
memset (fsr, 0, sizeof (*fsr));
next_addr = 0;
pc = get_pc_function_start (fi->pc);
while (1)
{
op = (unsigned long)read_memory_integer (pc, 4);
if ((op & 0xC0000000) == 0xC0000000)
{
/* long instruction */
if ((op & 0x3FFF0000) == 0x01FF0000)
{
/* add3 sp,sp,n */
short n = op & 0xFFFF;
next_addr += n;
}
else if ((op & 0x3F0F0000) == 0x340F0000)
{
/* st rn, @(offset,sp) */
short offset = op & 0xFFFF;
short n = (op >> 20) & 0xF;
fsr->regs[n] = next_addr + offset;
}
else if ((op & 0x3F1F0000) == 0x350F0000)
{
/* st2w rn, @(offset,sp) */
short offset = op & 0xFFFF;
short n = (op >> 20) & 0xF;
fsr->regs[n] = next_addr + offset;
fsr->regs[n+1] = next_addr + offset + 2;
}
else
break;
}
else
{
/* short instructions */
op1 = (op & 0x3FFF8000) >> 15;
op2 = op & 0x7FFF;
if (!prologue_find_regs(op1,fsr,pc) || !prologue_find_regs(op2,fsr,pc))
break;
}
pc += 4;
}
fi->size = -next_addr;
for (i=0; i<NUM_REGS-1; i++)
if (fsr->regs[i])
{
fsr->regs[i] = fp - (next_addr - fsr->regs[i]);
}
if (fsr->regs[13])
fi->return_pc = (read_memory_unsigned_integer(fsr->regs[13],2)-1) << 2;
else
fi->return_pc = (read_register(13) - 1) << 2;
/* th SP is not normally (ever?) saved, but check anyway */
if (!fsr->regs[SP_REGNUM])
{
/* 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
d10v_init_extra_frame_info (fromleaf, fi)
int fromleaf;
struct frame_info *fi;
{
struct frame_saved_regs dummy;
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
show_regs (args, from_tty)
char *args;
int from_tty;
{
long long num1, num2;
printf_filtered ("PC=%04x (0x%x) PSW=%04x RPT_S=%04x RPT_E=%04x RPT_C=%04x\n",
read_register (PC_REGNUM), read_register (PC_REGNUM) << 2,
read_register (PSW_REGNUM),
read_register (24),
read_register (25),
read_register (23));
printf_filtered ("R0-R7 %04x %04x %04x %04x %04x %04x %04x %04x\n",
read_register (0),
read_register (1),
read_register (2),
read_register (3),
read_register (4),
read_register (5),
read_register (6),
read_register (7));
printf_filtered ("R8-R15 %04x %04x %04x %04x %04x %04x %04x %04x\n",
read_register (8),
read_register (9),
read_register (10),
read_register (11),
read_register (12),
read_register (13),
read_register (14),
read_register (15));
read_register_gen (A0_REGNUM, (char *)&num1);
read_register_gen (A0_REGNUM+1, (char *)&num2);
printf_filtered ("A0-A1 %010llx %010llx\n",num1, num2);
}
void
_initialize_d10v_tdep ()
{
tm_print_insn = print_insn_d10v;
add_com ("regs", class_vars, show_regs, "Print all registers");
}
CORE_ADDR
d10v_read_register_pid (regno, pid)
int regno, pid;
{
int save_pid;
CORE_ADDR retval;
if (pid == inferior_pid)
return (read_register(regno)) << 2;
save_pid = inferior_pid;
inferior_pid = pid;
retval = read_register (regno);
inferior_pid = save_pid;
return (retval << 2);
}
void
d10v_write_register_pid (regno, val, pid)
int regno;
LONGEST val;
int pid;
{
int save_pid;
val >>= 2;
if (pid == inferior_pid)
{
write_register (regno, val);
return;
}
save_pid = inferior_pid;
inferior_pid = 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));
}
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