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.
270 lines
7.6 KiB
C
270 lines
7.6 KiB
C
/* Target-dependent code for Motorola 68000 BSD's.
|
||
|
||
Copyright (C) 2004-2015 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 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 "arch-utils.h"
|
||
#include "frame.h"
|
||
#include "osabi.h"
|
||
#include "regcache.h"
|
||
#include "regset.h"
|
||
#include "trad-frame.h"
|
||
#include "tramp-frame.h"
|
||
#include "gdbtypes.h"
|
||
|
||
#include "m68k-tdep.h"
|
||
#include "solib-svr4.h"
|
||
|
||
/* Core file support. */
|
||
|
||
/* Sizeof `struct reg' in <machine/reg.h>. */
|
||
#define M68KBSD_SIZEOF_GREGS (18 * 4)
|
||
|
||
/* Sizeof `struct fpreg' in <machine/reg.h. */
|
||
#define M68KBSD_SIZEOF_FPREGS (((8 * 3) + 3) * 4)
|
||
|
||
int
|
||
m68kbsd_fpreg_offset (struct gdbarch *gdbarch, int regnum)
|
||
{
|
||
int fp_len = TYPE_LENGTH (gdbarch_register_type (gdbarch, regnum));
|
||
|
||
if (regnum >= M68K_FPC_REGNUM)
|
||
return 8 * fp_len + (regnum - M68K_FPC_REGNUM) * 4;
|
||
|
||
return (regnum - M68K_FP0_REGNUM) * fp_len;
|
||
}
|
||
|
||
/* 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
|
||
m68kbsd_supply_fpregset (const struct regset *regset,
|
||
struct regcache *regcache,
|
||
int regnum, const void *fpregs, size_t len)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
const gdb_byte *regs = fpregs;
|
||
int i;
|
||
|
||
gdb_assert (len >= M68KBSD_SIZEOF_FPREGS);
|
||
|
||
for (i = M68K_FP0_REGNUM; i <= M68K_PC_REGNUM; i++)
|
||
{
|
||
if (regnum == i || regnum == -1)
|
||
regcache_raw_supply (regcache, i,
|
||
regs + m68kbsd_fpreg_offset (gdbarch, i));
|
||
}
|
||
}
|
||
|
||
/* 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
|
||
m68kbsd_supply_gregset (const struct regset *regset,
|
||
struct regcache *regcache,
|
||
int regnum, const void *gregs, size_t len)
|
||
{
|
||
const gdb_byte *regs = gregs;
|
||
int i;
|
||
|
||
gdb_assert (len >= M68KBSD_SIZEOF_GREGS);
|
||
|
||
for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++)
|
||
{
|
||
if (regnum == i || regnum == -1)
|
||
regcache_raw_supply (regcache, i, regs + i * 4);
|
||
}
|
||
|
||
if (len >= M68KBSD_SIZEOF_GREGS + M68KBSD_SIZEOF_FPREGS)
|
||
{
|
||
regs += M68KBSD_SIZEOF_GREGS;
|
||
len -= M68KBSD_SIZEOF_GREGS;
|
||
m68kbsd_supply_fpregset (regset, regcache, regnum, regs, len);
|
||
}
|
||
}
|
||
|
||
/* Motorola 68000 register sets. */
|
||
|
||
static const struct regset m68kbsd_gregset =
|
||
{
|
||
NULL,
|
||
m68kbsd_supply_gregset,
|
||
NULL,
|
||
REGSET_VARIABLE_SIZE
|
||
};
|
||
|
||
static const struct regset m68kbsd_fpregset =
|
||
{
|
||
NULL,
|
||
m68kbsd_supply_fpregset
|
||
};
|
||
|
||
/* Iterate over core file register note sections. */
|
||
|
||
static void
|
||
m68kbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
|
||
iterate_over_regset_sections_cb *cb,
|
||
void *cb_data,
|
||
const struct regcache *regcache)
|
||
{
|
||
cb (".reg", M68KBSD_SIZEOF_GREGS, &m68kbsd_gregset, NULL, cb_data);
|
||
cb (".reg2", M68KBSD_SIZEOF_FPREGS, &m68kbsd_fpregset, NULL, cb_data);
|
||
}
|
||
|
||
|
||
/* Signal trampolines. */
|
||
|
||
static void
|
||
m68kobsd_sigtramp_cache_init (const struct tramp_frame *self,
|
||
struct frame_info *this_frame,
|
||
struct trad_frame_cache *this_cache,
|
||
CORE_ADDR func)
|
||
{
|
||
CORE_ADDR addr, base, pc;
|
||
int regnum;
|
||
|
||
base = get_frame_register_unsigned (this_frame, M68K_SP_REGNUM);
|
||
|
||
/* The 'addql #4,%sp' instruction at offset 8 adjusts the stack
|
||
pointer. Adjust the frame base accordingly. */
|
||
pc = get_frame_register_unsigned (this_frame, M68K_PC_REGNUM);
|
||
if ((pc - func) > 8)
|
||
base -= 4;
|
||
|
||
/* Get frame pointer, stack pointer, program counter and processor
|
||
state from `struct sigcontext'. */
|
||
addr = get_frame_memory_unsigned (this_frame, base + 8, 4);
|
||
trad_frame_set_reg_addr (this_cache, M68K_FP_REGNUM, addr + 8);
|
||
trad_frame_set_reg_addr (this_cache, M68K_SP_REGNUM, addr + 12);
|
||
trad_frame_set_reg_addr (this_cache, M68K_PC_REGNUM, addr + 20);
|
||
trad_frame_set_reg_addr (this_cache, M68K_PS_REGNUM, addr + 24);
|
||
|
||
/* The sc_ap member of `struct sigcontext' points to additional
|
||
hardware state. Here we find the missing registers. */
|
||
addr = get_frame_memory_unsigned (this_frame, addr + 16, 4) + 4;
|
||
for (regnum = M68K_D0_REGNUM; regnum < M68K_FP_REGNUM; regnum++, addr += 4)
|
||
trad_frame_set_reg_addr (this_cache, regnum, addr);
|
||
|
||
/* Construct the frame ID using the function start. */
|
||
trad_frame_set_id (this_cache, frame_id_build (base, func));
|
||
}
|
||
|
||
static const struct tramp_frame m68kobsd_sigtramp = {
|
||
SIGTRAMP_FRAME,
|
||
2,
|
||
{
|
||
{ 0x206f, -1 }, { 0x000c, -1}, /* moveal %sp@(12),%a0 */
|
||
{ 0x4e90, -1 }, /* jsr %a0@ */
|
||
{ 0x588f, -1 }, /* addql #4,%sp */
|
||
{ 0x4e41, -1 }, /* trap #1 */
|
||
{ 0x2f40, -1 }, { 0x0004, -1 }, /* moveal %d0,%sp@(4) */
|
||
{ 0x7001, -1 }, /* moveq #SYS_exit,%d0 */
|
||
{ 0x4e40, -1 }, /* trap #0 */
|
||
{ TRAMP_SENTINEL_INSN, -1 }
|
||
},
|
||
m68kobsd_sigtramp_cache_init
|
||
};
|
||
|
||
|
||
static void
|
||
m68kbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
tdep->jb_pc = 5;
|
||
tdep->jb_elt_size = 4;
|
||
|
||
set_gdbarch_decr_pc_after_break (gdbarch, 2);
|
||
|
||
set_gdbarch_iterate_over_regset_sections
|
||
(gdbarch, m68kbsd_iterate_over_regset_sections);
|
||
}
|
||
|
||
/* OpenBSD and NetBSD a.out. */
|
||
|
||
static void
|
||
m68kbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
m68kbsd_init_abi (info, gdbarch);
|
||
|
||
tdep->struct_return = reg_struct_return;
|
||
|
||
tramp_frame_prepend_unwinder (gdbarch, &m68kobsd_sigtramp);
|
||
}
|
||
|
||
/* NetBSD ELF. */
|
||
|
||
static void
|
||
m68kbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
||
{
|
||
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
||
|
||
m68kbsd_init_abi (info, gdbarch);
|
||
|
||
/* NetBSD ELF uses the SVR4 ABI. */
|
||
m68k_svr4_init_abi (info, gdbarch);
|
||
tdep->struct_return = pcc_struct_return;
|
||
|
||
/* NetBSD ELF uses SVR4-style shared libraries. */
|
||
set_solib_svr4_fetch_link_map_offsets
|
||
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
|
||
}
|
||
|
||
|
||
static enum gdb_osabi
|
||
m68kbsd_aout_osabi_sniffer (bfd *abfd)
|
||
{
|
||
if (strcmp (bfd_get_target (abfd), "a.out-m68k-netbsd") == 0
|
||
|| strcmp (bfd_get_target (abfd), "a.out-m68k4k-netbsd") == 0)
|
||
return GDB_OSABI_NETBSD_AOUT;
|
||
|
||
return GDB_OSABI_UNKNOWN;
|
||
}
|
||
|
||
static enum gdb_osabi
|
||
m68kbsd_core_osabi_sniffer (bfd *abfd)
|
||
{
|
||
if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
|
||
return GDB_OSABI_NETBSD_AOUT;
|
||
|
||
return GDB_OSABI_UNKNOWN;
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
void _initialize_m68kbsd_tdep (void);
|
||
|
||
void
|
||
_initialize_m68kbsd_tdep (void)
|
||
{
|
||
gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_aout_flavour,
|
||
m68kbsd_aout_osabi_sniffer);
|
||
|
||
/* BFD doesn't set a flavour for NetBSD style a.out core files. */
|
||
gdbarch_register_osabi_sniffer (bfd_arch_m68k, bfd_target_unknown_flavour,
|
||
m68kbsd_core_osabi_sniffer);
|
||
|
||
gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_AOUT,
|
||
m68kbsd_aout_init_abi);
|
||
gdbarch_register_osabi (bfd_arch_m68k, 0, GDB_OSABI_NETBSD_ELF,
|
||
m68kbsd_elf_init_abi);
|
||
}
|