mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
f962539ad2
When reading a core file register section which is larger than expected, emit a warning. Assume that a register section usually has exactly the size specified by the regset section iterator. In some special cases this assumption is wrong, or at least does not match the regset supply function's logic. Thus also add a way to suppress the warning in those cases, using a new flag REGSET_VARIABLE_SIZE. gdb/ChangeLog: * regset.h (struct regset): Add flags field. (REGSET_VARIABLE_SIZE): New value for a regset's flags field. * corelow.c (get_core_register_section): Add warning if the size exceeds the requested size and the regset does not have the REGSET_VARIABLE_SIZE flag set. * alphanbsd-tdep.c (alphanbsd_gregset): Add REGSET_VARIABLE_SIZE flag. * armbsd-tdep.c (armbsd_gregset): Likewise. * hppa-hpux-tdep.c (hppa_hpux_regset): Likewise. * hppaobsd-tdep.c (hppaobsd_gregset): Likewise. * m68kbsd-tdep.c (m68kbsd_gregset): Likewise. * mipsnbsd-tdep.c (mipsnbsd_gregset): Likewise.
386 lines
11 KiB
C
386 lines
11 KiB
C
/* Target-dependent code for NetBSD/mips.
|
||
|
||
Copyright (C) 2002-2015 Free Software Foundation, Inc.
|
||
|
||
Contributed by Wasabi Systems, 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 3 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, see <http://www.gnu.org/licenses/>. */
|
||
|
||
#include "defs.h"
|
||
#include "gdbcore.h"
|
||
#include "regcache.h"
|
||
#include "regset.h"
|
||
#include "target.h"
|
||
#include "value.h"
|
||
#include "osabi.h"
|
||
|
||
#include "nbsd-tdep.h"
|
||
#include "mipsnbsd-tdep.h"
|
||
#include "mips-tdep.h"
|
||
|
||
#include "solib-svr4.h"
|
||
|
||
/* Shorthand for some register numbers used below. */
|
||
#define MIPS_PC_REGNUM MIPS_EMBED_PC_REGNUM
|
||
#define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM
|
||
#define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
|
||
|
||
/* Core file support. */
|
||
|
||
/* Number of registers in `struct reg' from <machine/reg.h>. */
|
||
#define MIPSNBSD_NUM_GREGS 38
|
||
|
||
/* Number of registers in `struct fpreg' from <machine/reg.h>. */
|
||
#define MIPSNBSD_NUM_FPREGS 33
|
||
|
||
/* Supply register REGNUM from the buffer specified by FPREGS and LEN
|
||
in the floating-point register set REGSET to register cache
|
||
REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
|
||
|
||
static void
|
||
mipsnbsd_supply_fpregset (const struct regset *regset,
|
||
struct regcache *regcache,
|
||
int regnum, const void *fpregs, size_t len)
|
||
{
|
||
size_t regsize = mips_isa_regsize (get_regcache_arch (regcache));
|
||
const char *regs = fpregs;
|
||
int i;
|
||
|
||
gdb_assert (len >= MIPSNBSD_NUM_FPREGS * regsize);
|
||
|
||
for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
|
||
{
|
||
if (regnum == i || regnum == -1)
|
||
regcache_raw_supply (regcache, i,
|
||
regs + (i - MIPS_FP0_REGNUM) * regsize);
|
||
}
|
||
}
|
||
|
||
/* Supply register REGNUM from the buffer specified by GREGS and LEN
|
||
in the general-purpose register set REGSET to register cache
|
||
REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
|
||
|
||
static void
|
||
mipsnbsd_supply_gregset (const struct regset *regset,
|
||
struct regcache *regcache, int regnum,
|
||
const void *gregs, size_t len)
|
||
{
|
||
size_t regsize = mips_isa_regsize (get_regcache_arch (regcache));
|
||
const char *regs = gregs;
|
||
int i;
|
||
|
||
gdb_assert (len >= MIPSNBSD_NUM_GREGS * regsize);
|
||
|
||
for (i = 0; i <= MIPS_PC_REGNUM; i++)
|
||
{
|
||
if (regnum == i || regnum == -1)
|
||
regcache_raw_supply (regcache, i, regs + i * regsize);
|
||
}
|
||
|
||
if (len >= (MIPSNBSD_NUM_GREGS + MIPSNBSD_NUM_FPREGS) * regsize)
|
||
{
|
||
regs += MIPSNBSD_NUM_GREGS * regsize;
|
||
len -= MIPSNBSD_NUM_GREGS * regsize;
|
||
mipsnbsd_supply_fpregset (regset, regcache, regnum, regs, len);
|
||
}
|
||
}
|
||
|
||
/* NetBSD/mips register sets. */
|
||
|
||
static const struct regset mipsnbsd_gregset =
|
||
{
|
||
NULL,
|
||
mipsnbsd_supply_gregset,
|
||
NULL,
|
||
REGSET_VARIABLE_SIZE
|
||
};
|
||
|
||
static const struct regset mipsnbsd_fpregset =
|
||
{
|
||
NULL,
|
||
mipsnbsd_supply_fpregset
|
||
};
|
||
|
||
/* Iterate over core file register note sections. */
|
||
|
||
static void
|
||
mipsnbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
|
||
iterate_over_regset_sections_cb *cb,
|
||
void *cb_data,
|
||
const struct regcache *regcache)
|
||
{
|
||
size_t regsize = mips_isa_regsize (gdbarch);
|
||
|
||
cb (".reg", MIPSNBSD_NUM_GREGS * regsize, &mipsnbsd_gregset,
|
||
NULL, cb_data);
|
||
cb (".reg2", MIPSNBSD_NUM_FPREGS * regsize, &mipsnbsd_fpregset,
|
||
NULL, cb_data);
|
||
}
|
||
|
||
|
||
/* Conveniently, GDB uses the same register numbering as the
|
||
ptrace register structure used by NetBSD/mips. */
|
||
|
||
void
|
||
mipsnbsd_supply_reg (struct regcache *regcache, const char *regs, int regno)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
int i;
|
||
|
||
for (i = 0; i <= gdbarch_pc_regnum (gdbarch); i++)
|
||
{
|
||
if (regno == i || regno == -1)
|
||
{
|
||
if (gdbarch_cannot_fetch_register (gdbarch, i))
|
||
regcache_raw_supply (regcache, i, NULL);
|
||
else
|
||
regcache_raw_supply (regcache, i,
|
||
regs + (i * mips_isa_regsize (gdbarch)));
|
||
}
|
||
}
|
||
}
|
||
|
||
void
|
||
mipsnbsd_fill_reg (const struct regcache *regcache, char *regs, int regno)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
int i;
|
||
|
||
for (i = 0; i <= gdbarch_pc_regnum (gdbarch); i++)
|
||
if ((regno == i || regno == -1)
|
||
&& ! gdbarch_cannot_store_register (gdbarch, i))
|
||
regcache_raw_collect (regcache, i,
|
||
regs + (i * mips_isa_regsize (gdbarch)));
|
||
}
|
||
|
||
void
|
||
mipsnbsd_supply_fpreg (struct regcache *regcache,
|
||
const char *fpregs, int regno)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
int i;
|
||
|
||
for (i = gdbarch_fp0_regnum (gdbarch);
|
||
i <= mips_regnum (gdbarch)->fp_implementation_revision;
|
||
i++)
|
||
{
|
||
if (regno == i || regno == -1)
|
||
{
|
||
if (gdbarch_cannot_fetch_register (gdbarch, i))
|
||
regcache_raw_supply (regcache, i, NULL);
|
||
else
|
||
regcache_raw_supply (regcache, i,
|
||
fpregs
|
||
+ ((i - gdbarch_fp0_regnum (gdbarch))
|
||
* mips_isa_regsize (gdbarch)));
|
||
}
|
||
}
|
||
}
|
||
|
||
void
|
||
mipsnbsd_fill_fpreg (const struct regcache *regcache, char *fpregs, int regno)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
int i;
|
||
|
||
for (i = gdbarch_fp0_regnum (gdbarch);
|
||
i <= mips_regnum (gdbarch)->fp_control_status;
|
||
i++)
|
||
if ((regno == i || regno == -1)
|
||
&& ! gdbarch_cannot_store_register (gdbarch, i))
|
||
regcache_raw_collect (regcache, i,
|
||
fpregs + ((i - gdbarch_fp0_regnum (gdbarch))
|
||
* mips_isa_regsize (gdbarch)));
|
||
}
|
||
|
||
#if 0
|
||
|
||
/* Under NetBSD/mips, signal handler invocations can be identified by the
|
||
designated code sequence that is used to return from a signal handler.
|
||
In particular, the return address of a signal handler points to the
|
||
following code sequence:
|
||
|
||
addu a0, sp, 16
|
||
li v0, 295 # __sigreturn14
|
||
syscall
|
||
|
||
Each instruction has a unique encoding, so we simply attempt to match
|
||
the instruction the PC is pointing to with any of the above instructions.
|
||
If there is a hit, we know the offset to the start of the designated
|
||
sequence and can then check whether we really are executing in the
|
||
signal trampoline. If not, -1 is returned, otherwise the offset from the
|
||
start of the return sequence is returned. */
|
||
|
||
#define RETCODE_NWORDS 3
|
||
#define RETCODE_SIZE (RETCODE_NWORDS * 4)
|
||
|
||
static const unsigned char sigtramp_retcode_mipsel[RETCODE_SIZE] =
|
||
{
|
||
0x10, 0x00, 0xa4, 0x27, /* addu a0, sp, 16 */
|
||
0x27, 0x01, 0x02, 0x24, /* li v0, 295 */
|
||
0x0c, 0x00, 0x00, 0x00, /* syscall */
|
||
};
|
||
|
||
static const unsigned char sigtramp_retcode_mipseb[RETCODE_SIZE] =
|
||
{
|
||
0x27, 0xa4, 0x00, 0x10, /* addu a0, sp, 16 */
|
||
0x24, 0x02, 0x01, 0x27, /* li v0, 295 */
|
||
0x00, 0x00, 0x00, 0x0c, /* syscall */
|
||
};
|
||
|
||
#endif
|
||
|
||
/* Figure out where the longjmp will land. We expect that we have
|
||
just entered longjmp and haven't yet setup the stack frame, so the
|
||
args are still in the argument regs. MIPS_A0_REGNUM points at the
|
||
jmp_buf structure from which we extract the PC that we will land
|
||
at. The PC is copied into *pc. This routine returns true on
|
||
success. */
|
||
|
||
#define NBSD_MIPS_JB_PC (2 * 4)
|
||
#define NBSD_MIPS_JB_ELEMENT_SIZE(gdbarch) mips_isa_regsize (gdbarch)
|
||
#define NBSD_MIPS_JB_OFFSET(gdbarch) (NBSD_MIPS_JB_PC * \
|
||
NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch))
|
||
|
||
static int
|
||
mipsnbsd_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
|
||
{
|
||
struct gdbarch *gdbarch = get_frame_arch (frame);
|
||
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
|
||
CORE_ADDR jb_addr;
|
||
gdb_byte *buf;
|
||
|
||
buf = alloca (NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch));
|
||
|
||
jb_addr = get_frame_register_unsigned (frame, MIPS_A0_REGNUM);
|
||
|
||
if (target_read_memory (jb_addr + NBSD_MIPS_JB_OFFSET (gdbarch), buf,
|
||
NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch)))
|
||
return 0;
|
||
|
||
*pc = extract_unsigned_integer (buf, NBSD_MIPS_JB_ELEMENT_SIZE (gdbarch),
|
||
byte_order);
|
||
return 1;
|
||
}
|
||
|
||
static int
|
||
mipsnbsd_cannot_fetch_register (struct gdbarch *gdbarch, int regno)
|
||
{
|
||
return (regno == MIPS_ZERO_REGNUM
|
||
|| regno == mips_regnum (gdbarch)->fp_implementation_revision);
|
||
}
|
||
|
||
static int
|
||
mipsnbsd_cannot_store_register (struct gdbarch *gdbarch, int regno)
|
||
{
|
||
return (regno == MIPS_ZERO_REGNUM
|
||
|| regno == mips_regnum (gdbarch)->fp_implementation_revision);
|
||
}
|
||
|
||
/* Shared library support. */
|
||
|
||
/* NetBSD/mips uses a slightly different `struct link_map' than the
|
||
other NetBSD platforms. */
|
||
|
||
static struct link_map_offsets *
|
||
mipsnbsd_ilp32_fetch_link_map_offsets (void)
|
||
{
|
||
static struct link_map_offsets lmo;
|
||
static struct link_map_offsets *lmp = NULL;
|
||
|
||
if (lmp == NULL)
|
||
{
|
||
lmp = &lmo;
|
||
|
||
lmo.r_version_offset = 0;
|
||
lmo.r_version_size = 4;
|
||
lmo.r_map_offset = 4;
|
||
lmo.r_brk_offset = 8;
|
||
lmo.r_ldsomap_offset = -1;
|
||
|
||
/* Everything we need is in the first 24 bytes. */
|
||
lmo.link_map_size = 24;
|
||
lmo.l_addr_offset = 4;
|
||
lmo.l_name_offset = 8;
|
||
lmo.l_ld_offset = 12;
|
||
lmo.l_next_offset = 16;
|
||
lmo.l_prev_offset = 20;
|
||
}
|
||
|
||
return lmp;
|
||
}
|
||
|
||
static struct link_map_offsets *
|
||
mipsnbsd_lp64_fetch_link_map_offsets (void)
|
||
{
|
||
static struct link_map_offsets lmo;
|
||
static struct link_map_offsets *lmp = NULL;
|
||
|
||
if (lmp == NULL)
|
||
{
|
||
lmp = &lmo;
|
||
|
||
lmo.r_version_offset = 0;
|
||
lmo.r_version_size = 4;
|
||
lmo.r_map_offset = 8;
|
||
lmo.r_brk_offset = 16;
|
||
lmo.r_ldsomap_offset = -1;
|
||
|
||
/* Everything we need is in the first 40 bytes. */
|
||
lmo.link_map_size = 48;
|
||
lmo.l_addr_offset = 0;
|
||
lmo.l_name_offset = 16;
|
||
lmo.l_ld_offset = 24;
|
||
lmo.l_next_offset = 32;
|
||
lmo.l_prev_offset = 40;
|
||
}
|
||
|
||
return lmp;
|
||
}
|
||
|
||
|
||
static void
|
||
mipsnbsd_init_abi (struct gdbarch_info info,
|
||
struct gdbarch *gdbarch)
|
||
{
|
||
set_gdbarch_iterate_over_regset_sections
|
||
(gdbarch, mipsnbsd_iterate_over_regset_sections);
|
||
|
||
set_gdbarch_get_longjmp_target (gdbarch, mipsnbsd_get_longjmp_target);
|
||
|
||
set_gdbarch_cannot_fetch_register (gdbarch, mipsnbsd_cannot_fetch_register);
|
||
set_gdbarch_cannot_store_register (gdbarch, mipsnbsd_cannot_store_register);
|
||
|
||
set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
|
||
|
||
/* NetBSD/mips has SVR4-style shared libraries. */
|
||
set_solib_svr4_fetch_link_map_offsets
|
||
(gdbarch, (gdbarch_ptr_bit (gdbarch) == 32 ?
|
||
mipsnbsd_ilp32_fetch_link_map_offsets :
|
||
mipsnbsd_lp64_fetch_link_map_offsets));
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
extern initialize_file_ftype _initialize_mipsnbsd_tdep;
|
||
|
||
void
|
||
_initialize_mipsnbsd_tdep (void)
|
||
{
|
||
gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_NETBSD_ELF,
|
||
mipsnbsd_init_abi);
|
||
}
|