mirror of
https://github.com/darlinghq/darling-gdb.git
synced 2024-12-05 02:47:05 +00:00
230 lines
6.1 KiB
C
230 lines
6.1 KiB
C
/* 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);
|
||
}
|