/* Target-machine dependent code for WDC-65816, for GDB.
|
/* Target-machine dependent code for WDC-65816, for GDB.
|
Copyright (C) 1995 Free Software Foundation, Inc.
|
Copyright (C) 1995 Free Software Foundation, Inc.
|
|
|
This file is part of GDB.
|
This file is part of GDB.
|
|
|
This program is free software; you can redistribute it and/or modify
|
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
|
it under the terms of the GNU General Public License as published by
|
the Free Software Foundation; either version 2 of the License, or
|
the Free Software Foundation; either version 2 of the License, or
|
(at your option) any later version.
|
(at your option) any later version.
|
|
|
This program is distributed in the hope that it will be useful,
|
This program is distributed in the hope that it will be useful,
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
GNU General Public License for more details.
|
GNU General Public License for more details.
|
|
|
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
along with this program; if not, write to the Free Software
|
along with this program; if not, write to the Free Software
|
Foundation, Inc., 59 Temple Place - Suite 330,
|
Foundation, Inc., 59 Temple Place - Suite 330,
|
Boston, MA 02111-1307, USA. */
|
Boston, MA 02111-1307, USA. */
|
|
|
/*
|
/*
|
Contributed by Steve Chamberlain
|
Contributed by Steve Chamberlain
|
sac@cygnus.com
|
sac@cygnus.com
|
*/
|
*/
|
|
|
#include "defs.h"
|
#include "defs.h"
|
#include "frame.h"
|
#include "frame.h"
|
#include "obstack.h"
|
#include "obstack.h"
|
#include "symtab.h"
|
#include "symtab.h"
|
#include "gdbcmd.h"
|
#include "gdbcmd.h"
|
#include "gdbtypes.h"
|
#include "gdbtypes.h"
|
#include "dis-asm.h"
|
#include "dis-asm.h"
|
#include "gdbcore.h"
|
#include "gdbcore.h"
|
|
|
/* Return the saved PC from this frame. */
|
/* Return the saved PC from this frame. */
|
|
|
|
|
CORE_ADDR
|
CORE_ADDR
|
w65_frame_saved_pc (frame)
|
w65_frame_saved_pc (frame)
|
struct frame_info *frame;
|
struct frame_info *frame;
|
{
|
{
|
return (read_memory_integer (frame->frame + 2, 4) & 0xffffff);
|
return (read_memory_integer (frame->frame + 2, 4) & 0xffffff);
|
}
|
}
|
|
|
CORE_ADDR
|
CORE_ADDR
|
w65_addr_bits_remove (addr)
|
w65_addr_bits_remove (addr)
|
CORE_ADDR addr;
|
CORE_ADDR addr;
|
{
|
{
|
return ((addr) & 0xffffff);
|
return ((addr) & 0xffffff);
|
}
|
}
|
|
|
read_memory_pointer (x)
|
read_memory_pointer (x)
|
CORE_ADDR x;
|
CORE_ADDR x;
|
{
|
{
|
return read_memory_integer (ADDR_BITS_REMOVE (x), 4);
|
return read_memory_integer (ADDR_BITS_REMOVE (x), 4);
|
}
|
}
|
|
|
init_frame_pc ()
|
init_frame_pc ()
|
{
|
{
|
abort ();
|
abort ();
|
}
|
}
|
|
|
void
|
void
|
w65_push_dummy_frame ()
|
w65_push_dummy_frame ()
|
{
|
{
|
abort ();
|
abort ();
|
}
|
}
|
|
|
/* Put here the code to store, into a struct frame_saved_regs,
|
/* Put here the code to store, into a struct frame_saved_regs,
|
the addresses of the saved registers of frame described by FRAME_INFO.
|
the addresses of the saved registers of frame described by FRAME_INFO.
|
This includes special registers such as pc and fp saved in special
|
This includes special registers such as pc and fp saved in special
|
ways in the stack frame. sp is even more special:
|
ways in the stack frame. sp is even more special:
|
the address we return for it IS the sp for the next frame.
|
the address we return for it IS the sp for the next frame.
|
|
|
We cache the result of doing this in the frame_cache_obstack, since
|
We cache the result of doing this in the frame_cache_obstack, since
|
it is fairly expensive. */
|
it is fairly expensive. */
|
|
|
void
|
void
|
frame_find_saved_regs (fip, fsrp)
|
frame_find_saved_regs (fip, fsrp)
|
struct frame_info *fip;
|
struct frame_info *fip;
|
struct frame_saved_regs *fsrp;
|
struct frame_saved_regs *fsrp;
|
{
|
{
|
int locals;
|
int locals;
|
CORE_ADDR pc;
|
CORE_ADDR pc;
|
CORE_ADDR adr;
|
CORE_ADDR adr;
|
int i;
|
int i;
|
|
|
memset (fsrp, 0, sizeof *fsrp);
|
memset (fsrp, 0, sizeof *fsrp);
|
}
|
}
|
|
|
int
|
int
|
saved_pc_after_call ()
|
saved_pc_after_call ()
|
{
|
{
|
int sp = read_register (SP_REGNUM);
|
int sp = read_register (SP_REGNUM);
|
int val = read_memory_integer (sp + 1, 4);
|
int val = read_memory_integer (sp + 1, 4);
|
return ADDR_BITS_REMOVE (val);
|
return ADDR_BITS_REMOVE (val);
|
}
|
}
|
|
|
|
|
extract_return_value (type, regbuf, valbuf)
|
extract_return_value (type, regbuf, valbuf)
|
struct type *type;
|
struct type *type;
|
char *regbuf;
|
char *regbuf;
|
char *valbuf;
|
char *valbuf;
|
{
|
{
|
int b;
|
int b;
|
int len = TYPE_LENGTH (type);
|
int len = TYPE_LENGTH (type);
|
|
|
for (b = 0; b < len; b += 2)
|
for (b = 0; b < len; b += 2)
|
{
|
{
|
int todo = len - b;
|
int todo = len - b;
|
if (todo > 2)
|
if (todo > 2)
|
todo = 2;
|
todo = 2;
|
memcpy (valbuf + b, regbuf + b, todo);
|
memcpy (valbuf + b, regbuf + b, todo);
|
}
|
}
|
}
|
}
|
|
|
void
|
void
|
write_return_value (type, valbuf)
|
write_return_value (type, valbuf)
|
struct type *type;
|
struct type *type;
|
char *valbuf;
|
char *valbuf;
|
{
|
{
|
int reg;
|
int reg;
|
int len;
|
int len;
|
for (len = 0; len < TYPE_LENGTH (type); len += 2)
|
for (len = 0; len < TYPE_LENGTH (type); len += 2)
|
{
|
{
|
write_register_bytes (REGISTER_BYTE (len / 2 + 2), valbuf + len, 2);
|
write_register_bytes (REGISTER_BYTE (len / 2 + 2), valbuf + len, 2);
|
}
|
}
|
}
|
}
|
|
|
void
|
void
|
store_struct_return (addr, sp)
|
store_struct_return (addr, sp)
|
CORE_ADDR addr;
|
CORE_ADDR addr;
|
CORE_ADDR sp;
|
CORE_ADDR sp;
|
{
|
{
|
write_register (2, addr);
|
write_register (2, addr);
|
}
|
}
|
|
|
void
|
void
|
w65_pop_frame ()
|
w65_pop_frame ()
|
{
|
{
|
}
|
}
|
|
|
init_extra_frame_info ()
|
init_extra_frame_info ()
|
{
|
{
|
}
|
}
|
|
|
pop_frame ()
|
pop_frame ()
|
{
|
{
|
}
|
}
|
|
|
w65_frame_chain (thisframe)
|
w65_frame_chain (thisframe)
|
struct frame_info *thisframe;
|
struct frame_info *thisframe;
|
{
|
{
|
return 0xffff & read_memory_integer ((thisframe)->frame, 2);
|
return 0xffff & read_memory_integer ((thisframe)->frame, 2);
|
}
|
}
|
|
|
static int
|
static int
|
gb (x)
|
gb (x)
|
{
|
{
|
return read_memory_integer (x, 1) & 0xff;
|
return read_memory_integer (x, 1) & 0xff;
|
}
|
}
|
|
|
extern CORE_ADDR
|
extern CORE_ADDR
|
w65_skip_prologue (pc)
|
w65_skip_prologue (pc)
|
CORE_ADDR pc;
|
CORE_ADDR pc;
|
{
|
{
|
CORE_ADDR too_far = pc + 20;
|
CORE_ADDR too_far = pc + 20;
|
|
|
/* looking for bits of the prologue, we can expect to
|
/* looking for bits of the prologue, we can expect to
|
see this in a frameful function:
|
see this in a frameful function:
|
|
|
stack adjust:
|
stack adjust:
|
|
|
3B tsc
|
3B tsc
|
1A inc a
|
1A inc a
|
18 clc
|
18 clc
|
69E2FF adc #0xffe2
|
69E2FF adc #0xffe2
|
3A dec a
|
3A dec a
|
1B tcs
|
1B tcs
|
1A inc a
|
1A inc a
|
|
|
link:
|
link:
|
|
|
A500 lda <r15
|
A500 lda <r15
|
48 pha
|
48 pha
|
3B tsc
|
3B tsc
|
1a inc a
|
1a inc a
|
8500 sta <r15
|
8500 sta <r15
|
|
|
*/
|
*/
|
|
|
#define TSC 0x3b
|
#define TSC 0x3b
|
#define TCS 0x1b
|
#define TCS 0x1b
|
#define INCA 0x1a
|
#define INCA 0x1a
|
#define PHA 0x48
|
#define PHA 0x48
|
#define LDADIR 0xa5
|
#define LDADIR 0xa5
|
#define STADIR 0x85
|
#define STADIR 0x85
|
|
|
/* Skip a stack adjust - any area between a tsc and tcs */
|
/* Skip a stack adjust - any area between a tsc and tcs */
|
if (gb (pc) == TSC)
|
if (gb (pc) == TSC)
|
{
|
{
|
while (pc < too_far && gb (pc) != TCS)
|
while (pc < too_far && gb (pc) != TCS)
|
{
|
{
|
pc++;
|
pc++;
|
}
|
}
|
pc++;
|
pc++;
|
/* Skip a stupid inc a */
|
/* Skip a stupid inc a */
|
if (gb (pc) == INCA)
|
if (gb (pc) == INCA)
|
pc++;
|
pc++;
|
|
|
}
|
}
|
/* Stack adjust can also be done with n pha's */
|
/* Stack adjust can also be done with n pha's */
|
while (gb (pc) == PHA)
|
while (gb (pc) == PHA)
|
pc++;
|
pc++;
|
|
|
/* Skip a link - that's a ld/ph/tsc/inc/sta */
|
/* Skip a link - that's a ld/ph/tsc/inc/sta */
|
|
|
if (gb (pc) == LDADIR
|
if (gb (pc) == LDADIR
|
&& gb (pc + 5) == STADIR
|
&& gb (pc + 5) == STADIR
|
&& gb (pc + 1) == gb (pc + 6)
|
&& gb (pc + 1) == gb (pc + 6)
|
&& gb (pc + 2) == PHA
|
&& gb (pc + 2) == PHA
|
&& gb (pc + 3) == TSC
|
&& gb (pc + 3) == TSC
|
&& gb (pc + 4) == INCA)
|
&& gb (pc + 4) == INCA)
|
{
|
{
|
pc += 7;
|
pc += 7;
|
}
|
}
|
|
|
return pc;
|
return pc;
|
}
|
}
|
|
|
|
|
register_raw_size (n)
|
register_raw_size (n)
|
{
|
{
|
return sim_reg_size (n);
|
return sim_reg_size (n);
|
}
|
}
|
|
|
|
|
void
|
void
|
print_register_hook (regno)
|
print_register_hook (regno)
|
{
|
{
|
if (regno == P_REGNUM)
|
if (regno == P_REGNUM)
|
{
|
{
|
/* CCR register */
|
/* CCR register */
|
|
|
int C, Z, N, V, I, D, X, M;
|
int C, Z, N, V, I, D, X, M;
|
unsigned char b[1];
|
unsigned char b[1];
|
unsigned char l;
|
unsigned char l;
|
|
|
read_relative_register_raw_bytes (regno, b);
|
read_relative_register_raw_bytes (regno, b);
|
l = b[0];
|
l = b[0];
|
printf_unfiltered ("\t");
|
printf_unfiltered ("\t");
|
C = (l & 0x1) != 0;
|
C = (l & 0x1) != 0;
|
Z = (l & 0x2) != 0;
|
Z = (l & 0x2) != 0;
|
I = (l & 0x4) != 0;
|
I = (l & 0x4) != 0;
|
D = (l & 0x8) != 0;
|
D = (l & 0x8) != 0;
|
X = (l & 0x10) != 0;
|
X = (l & 0x10) != 0;
|
M = (l & 0x20) != 0;
|
M = (l & 0x20) != 0;
|
V = (l & 0x40) != 0;
|
V = (l & 0x40) != 0;
|
N = (l & 0x80) != 0;
|
N = (l & 0x80) != 0;
|
|
|
printf_unfiltered ("N-%d ", N);
|
printf_unfiltered ("N-%d ", N);
|
printf_unfiltered ("V-%d ", V);
|
printf_unfiltered ("V-%d ", V);
|
printf_unfiltered ("M-%d ", M);
|
printf_unfiltered ("M-%d ", M);
|
printf_unfiltered ("X-%d ", X);
|
printf_unfiltered ("X-%d ", X);
|
printf_unfiltered ("D-%d ", D);
|
printf_unfiltered ("D-%d ", D);
|
printf_unfiltered ("I-%d ", I);
|
printf_unfiltered ("I-%d ", I);
|
printf_unfiltered ("Z-%d ", Z);
|
printf_unfiltered ("Z-%d ", Z);
|
printf_unfiltered ("C-%d ", C);
|
printf_unfiltered ("C-%d ", C);
|
if ((C | Z) == 0)
|
if ((C | Z) == 0)
|
printf_unfiltered ("u> ");
|
printf_unfiltered ("u> ");
|
if ((C | Z) == 1)
|
if ((C | Z) == 1)
|
printf_unfiltered ("u<= ");
|
printf_unfiltered ("u<= ");
|
if ((C == 0))
|
if ((C == 0))
|
printf_unfiltered ("u>= ");
|
printf_unfiltered ("u>= ");
|
if (C == 1)
|
if (C == 1)
|
printf_unfiltered ("u< ");
|
printf_unfiltered ("u< ");
|
if (Z == 0)
|
if (Z == 0)
|
printf_unfiltered ("!= ");
|
printf_unfiltered ("!= ");
|
if (Z == 1)
|
if (Z == 1)
|
printf_unfiltered ("== ");
|
printf_unfiltered ("== ");
|
if ((N ^ V) == 0)
|
if ((N ^ V) == 0)
|
printf_unfiltered (">= ");
|
printf_unfiltered (">= ");
|
if ((N ^ V) == 1)
|
if ((N ^ V) == 1)
|
printf_unfiltered ("< ");
|
printf_unfiltered ("< ");
|
if ((Z | (N ^ V)) == 0)
|
if ((Z | (N ^ V)) == 0)
|
printf_unfiltered ("> ");
|
printf_unfiltered ("> ");
|
if ((Z | (N ^ V)) == 1)
|
if ((Z | (N ^ V)) == 1)
|
printf_unfiltered ("<= ");
|
printf_unfiltered ("<= ");
|
}
|
}
|
}
|
}
|
|
|
void
|
void
|
_initialize_w65_tdep ()
|
_initialize_w65_tdep ()
|
{
|
{
|
tm_print_insn = print_insn_w65;
|
tm_print_insn = print_insn_w65;
|
}
|
}
|
|
|
