mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
7ccb1e4401
host. * sh-tdep.c (frame_find_saved_regs): Use NUM_REGS rather than hard wired (and wrong) constant. * values.c (unpack_long): Add case to unpack when target object is sizeof(int). * config/sh/tm-sh.h (REGISTER_NAMES): Know about the news ones the simulator defines.
256 lines
5.8 KiB
C
256 lines
5.8 KiB
C
/* Target-machine dependent code for Hitachi Super-H, for GDB.
|
|
Copyright (C) 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
/*
|
|
Contributed by Steve Chamberlain
|
|
sac@cygnus.com
|
|
*/
|
|
|
|
#include "defs.h"
|
|
#include "frame.h"
|
|
#include "obstack.h"
|
|
#include "symtab.h"
|
|
#include "gdbtypes.h"
|
|
#include "gdbcmd.h"
|
|
#include "value.h"
|
|
#include "dis-asm.h"
|
|
#include "../opcodes/sh-opc.h"
|
|
|
|
|
|
|
|
|
|
/* Prologue looks like
|
|
[mov.l <regs>,@-r15]...
|
|
[sts.l pr,@-r15]
|
|
[mov.l r14,@-r15]
|
|
[mov r15,r14]
|
|
*/
|
|
|
|
#define IS_STS(x) ((x) == 0x4f22)
|
|
#define IS_PUSH(x) (((x) & 0xff0f) == 0x2f06)
|
|
#define GET_PUSHED_REG(x) (((x) >> 4) & 0xf)
|
|
#define IS_MOV_SP_FP(x) ((x) == 0x6ef3)
|
|
#define IS_ADD_SP(x) (((x) & 0xff00) == 0x7f00)
|
|
|
|
|
|
/* Skip any prologue before the guts of a function */
|
|
|
|
CORE_ADDR
|
|
sh_skip_prologue (start_pc)
|
|
CORE_ADDR start_pc;
|
|
|
|
{
|
|
int w;
|
|
|
|
w = read_memory_integer (start_pc, 2);
|
|
while (IS_STS (w)
|
|
|| IS_PUSH (w)
|
|
|| IS_MOV_SP_FP (w))
|
|
{
|
|
start_pc += 2;
|
|
w = read_memory_integer (start_pc, 2);
|
|
}
|
|
|
|
return start_pc;
|
|
}
|
|
|
|
/* Disassemble an instruction */
|
|
|
|
int
|
|
print_insn (memaddr, stream)
|
|
CORE_ADDR memaddr;
|
|
FILE *stream;
|
|
{
|
|
disassemble_info info;
|
|
GDB_INIT_DISASSEMBLE_INFO (info, stream);
|
|
return print_insn_sh (memaddr, &info);
|
|
}
|
|
|
|
/* 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.
|
|
|
|
For us, the frame address is its stack pointer value, so we look up
|
|
the function prologue to determine the caller's sp value, and return it. */
|
|
|
|
FRAME_ADDR
|
|
sh_frame_chain (thisframe)
|
|
FRAME thisframe;
|
|
{
|
|
if (!inside_entry_file (thisframe->pc))
|
|
return (read_memory_integer (FRAME_FP (thisframe), 4));
|
|
else
|
|
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
|
|
frame_find_saved_regs (fi, fsr)
|
|
struct frame_info *fi;
|
|
struct frame_saved_regs *fsr;
|
|
{
|
|
int where[NUM_REGS];
|
|
int rn;
|
|
int have_fp = 0;
|
|
int depth;
|
|
int pc;
|
|
int opc;
|
|
int insn;
|
|
|
|
opc = pc = get_pc_function_start (fi->pc);
|
|
|
|
insn = read_memory_integer (pc, 2);
|
|
|
|
for (rn = 0; rn < NUM_REGS; rn++)
|
|
where[rn] = -1;
|
|
|
|
depth = 0;
|
|
|
|
/* Loop around examining the prologue insns, but give up
|
|
after 15 of them, since we're getting silly then */
|
|
while (pc < opc + 15 * 2)
|
|
{
|
|
/* See where the registers will be saved to */
|
|
if (IS_PUSH (insn))
|
|
{
|
|
pc += 2;
|
|
rn = GET_PUSHED_REG (insn);
|
|
where[rn] = depth;
|
|
insn = read_memory_integer (pc, 2);
|
|
depth += 4;
|
|
}
|
|
else if (IS_STS (insn))
|
|
{
|
|
pc += 2;
|
|
where[PR_REGNUM] = depth;
|
|
insn = read_memory_integer (pc, 2);
|
|
depth += 4;
|
|
}
|
|
else if (IS_ADD_SP (insn))
|
|
{
|
|
pc += 2;
|
|
depth += -((char) (insn & 0xff));
|
|
insn = read_memory_integer (pc, 2);
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
|
|
/* Now we know how deep things are, we can work out their addresses */
|
|
|
|
for (rn = 0; rn < NUM_REGS; rn++)
|
|
{
|
|
if (where[rn] >= 0)
|
|
{
|
|
if (rn == FP_REGNUM)
|
|
have_fp = 1;
|
|
|
|
fsr->regs[rn] = fi->frame - where[rn] + depth - 4;
|
|
}
|
|
else
|
|
{
|
|
fsr->regs[rn] = 0;
|
|
}
|
|
}
|
|
|
|
if (have_fp)
|
|
{
|
|
fsr->regs[SP_REGNUM] = read_memory_integer (fsr->regs[FP_REGNUM], 4);
|
|
}
|
|
else
|
|
{
|
|
fsr->regs[SP_REGNUM] = fi->frame - 4;
|
|
}
|
|
|
|
|
|
/* Work out the return pc - either from the saved pr or the pr
|
|
value */
|
|
|
|
if (fsr->regs[PR_REGNUM])
|
|
{
|
|
fi->return_pc = read_memory_integer (fsr->regs[PR_REGNUM], 4) + 4;
|
|
}
|
|
else
|
|
{
|
|
fi->return_pc = read_register (PR_REGNUM) + 4;
|
|
}
|
|
}
|
|
|
|
/* initialize the extra info saved in a FRAME */
|
|
|
|
void
|
|
init_extra_frame_info (fromleaf, fi)
|
|
int fromleaf;
|
|
struct frame_info *fi;
|
|
{
|
|
struct frame_saved_regs dummy;
|
|
frame_find_saved_regs (fi, &dummy);
|
|
}
|
|
|
|
|
|
/* Discard from the stack the innermost frame,
|
|
restoring all saved registers. */
|
|
|
|
void
|
|
pop_frame ()
|
|
{
|
|
register FRAME frame = get_current_frame ();
|
|
register CORE_ADDR fp;
|
|
register int regnum;
|
|
struct frame_saved_regs fsr;
|
|
struct frame_info *fi;
|
|
|
|
fi = get_frame_info (frame);
|
|
fp = fi->frame;
|
|
get_frame_saved_regs (fi, &fsr);
|
|
|
|
/* Copy regs from where they were saved in the frame */
|
|
for (regnum = 0; regnum < NUM_REGS; regnum++)
|
|
{
|
|
if (fsr.regs[regnum])
|
|
{
|
|
write_register (regnum, read_memory_integer (fsr.regs[regnum], 4));
|
|
}
|
|
}
|
|
|
|
write_register (PC_REGNUM, fi->return_pc);
|
|
write_register (SP_REGNUM, fp + 4);
|
|
flush_cached_frames ();
|
|
set_current_frame (create_new_frame (read_register (FP_REGNUM),
|
|
read_pc ()));
|
|
}
|
|
|
|
|
|
_initialize_sh_tdep ()
|
|
{
|
|
extern int sim_memory_size;
|
|
/* FIXME, there should be a way to make a CORE_ADDR variable settable. */
|
|
add_show_from_set
|
|
(add_set_cmd ("memory_size", class_support, var_uinteger,
|
|
(char *) &sim_memory_size,
|
|
"Set simulated memory size of simulator target.", &setlist),
|
|
&showlist);
|
|
}
|