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/* Motorola m68k native support for Linux
Copyright 1996, 1998, 2000, 2001 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. */
#include "defs.h"
#include "frame.h"
#include "inferior.h"
#include "language.h"
#include "gdbcore.h"
#include "regcache.h"
#ifdef USG
#include <sys/types.h>
#endif
#include <sys/param.h>
#include <sys/dir.h>
#include <signal.h>
#include <sys/user.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <sys/procfs.h>
#include <sys/file.h>
#include "gdb_stat.h"
#include "floatformat.h"
#include "target.h"
/* This table must line up with REGISTER_NAMES in tm-m68k.h */
static const int regmap[] =
{
PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
PT_SR, PT_PC,
/* PT_FP0, ..., PT_FP7 */
21, 24, 27, 30, 33, 36, 39, 42,
/* PT_FPCR, PT_FPSR, PT_FPIAR */
45, 46, 47
};
/* BLOCKEND is the value of u.u_ar0, and points to the place where GS
is stored. */
int
m68k_linux_register_u_addr (int blockend, int regnum)
{
return (blockend + 4 * regmap[regnum]);
}
/* Given a pointer to a general register set in /proc format
(elf_gregset_t *), unpack the register contents and supply
them as gdb's idea of the current register values. */
/* Note both m68k-tdep.c and m68klinux-nat.c contain definitions
for supply_gregset and supply_fpregset. The definitions
in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise,
the definitions in m68klinux-nat.c will be used. This is a
bit of a hack. The supply_* routines do not belong in
*_tdep.c files. But, there are several lynx ports that currently
depend on these definitions. */
#ifndef USE_PROC_FS
/* Prototypes for supply_gregset etc. */
#include "gregset.h"
void
supply_gregset (elf_gregset_t *gregsetp)
{
int regi;
for (regi = D0_REGNUM; regi <= SP_REGNUM; regi++)
supply_register (regi, (char *) (*gregsetp + regmap[regi]));
supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR));
supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC));
}
/* Given a pointer to a floating point register set in /proc format
(fpregset_t *), unpack the register contents and supply them as gdb's
idea of the current floating point register values. */
void
supply_fpregset (elf_fpregset_t *fpregsetp)
{
int regi;
for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]);
supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]);
supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]);
supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]);
}
#endif
/* Interpreting register set info found in core files. */
/* Provide registers to GDB from a core file.
(We can't use the generic version of this function in
core-regset.c, because we need to use elf_gregset_t instead of
gregset_t.)
CORE_REG_SECT points to an array of bytes, which are the contents
of a `note' from a core file which BFD thinks might contain
register contents. CORE_REG_SIZE is its size.
WHICH says which register set corelow suspects this is:
0 --- the general-purpose register set, in elf_gregset_t format
2 --- the floating-point register set, in elf_fpregset_t format
REG_ADDR isn't used on Linux. */
static void
fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
int which, CORE_ADDR reg_addr)
{
elf_gregset_t gregset;
elf_fpregset_t fpregset;
switch (which)
{
case 0:
if (core_reg_size != sizeof (gregset))
warning ("Wrong size gregset in core file.");
else
{
memcpy (&gregset, core_reg_sect, sizeof (gregset));
supply_gregset (&gregset);
}
break;
case 2:
if (core_reg_size != sizeof (fpregset))
warning ("Wrong size fpregset in core file.");
else
{
memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
supply_fpregset (&fpregset);
}
break;
default:
/* We've covered all the kinds of registers we know about here,
so this must be something we wouldn't know what to do with
anyway. Just ignore it. */
break;
}
}
int
kernel_u_size (void)
{
return (sizeof (struct user));
}
/* Return non-zero if PC points into the signal trampoline. */
int
in_sigtramp (CORE_ADDR pc)
{
CORE_ADDR sp;
char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT];
int insn;
sp = read_register (SP_REGNUM);
if (pc - 2 < sp)
return 0;
if (read_memory_nobpt (pc, buf, sizeof (buf)))
return 0;
insn = extract_unsigned_integer (buf, sizeof (buf));
if (insn == 0xdefc /* addaw #,sp */
|| insn == 0x7077 /* moveq #119,d0 */
|| insn == 0x4e40 /* trap #0 */
|| insn == 0x203c /* movel #,d0 */ )
return 1;
if (read_memory_nobpt (pc - 2, buf, sizeof (buf)))
return 0;
insn = extract_unsigned_integer (buf, sizeof (buf));
if (insn == 0xdefc /* addaw #,sp */
|| insn == 0x7077 /* moveq #119,d0 */
|| insn == 0x4e40 /* trap #0 */
|| insn == 0x203c /* movel #,d0 */ )
return 1;
return 0;
}
/* Register that we are able to handle Linux ELF core file formats. */
static struct core_fns linux_elf_core_fns =
{
bfd_target_elf_flavour, /* core_flavour */
default_check_format, /* check_format */
default_core_sniffer, /* core_sniffer */
fetch_core_registers, /* core_read_registers */
NULL /* next */
};
void
_initialize_m68k_linux_nat ()
{
add_core_fns (&linux_elf_core_fns);
}
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