199b2450f6
Change all references to stdout/stderr to gdb_stdout/gdb_stderr. Replace all calls to stdio output functions with calls to corresponding _unfiltered functions (`fprintf_unfiltered') Replaced calls to fopen for output to gdb_fopen. Added sufficient goo to utils.c and defs.h to make the above work. The net effect is that stdio output functions are only directly used in utils.c. Elsewhere, the _unfiltered and _filtered functions and GDB_FILE type are used. In the near future, GDB_FILE will stop being equivalant to FILE. The semantics of some commands has changed in a very subtle way: called in the right context, they may cause new occurences of prompt_for_continue() behavior. The testsuite doesn't notice anything like this, though. Please respect this change by not reintroducing stdio output dependencies in the main body of gdb code. All output from commands should go to a GDB_FILE. Target-specific code can still use stdio directly to communicate with targets.
267 lines
6 KiB
C
267 lines
6 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;
|
||
GDB_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 ()));
|
||
}
|
||
|
||
/* This doesn't quite fit either in the simulator or in gdb proper.
|
||
Perhaps the simulator could return 1 to mean it loaded it and 0 to
|
||
mean "you deal with it, caller". */
|
||
|
||
int
|
||
sim_load (abfd, prog)
|
||
bfd *abfd;
|
||
char *prog;
|
||
{
|
||
return sim_load_standard (abfd);
|
||
}
|
||
|
||
void
|
||
_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);
|
||
}
|