314 lines
8.9 KiB
C
314 lines
8.9 KiB
C
/* Target-dependent code for NetBSD/Alpha.
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Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
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Contributed by Wasabi Systems, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "gdbcore.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "value.h"
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#include "osabi.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "alpha-tdep.h"
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#include "alphabsd-tdep.h"
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#include "nbsd-tdep.h"
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#include "solib-svr4.h"
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/* Core file support. */
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/* Even though NetBSD/alpha used ELF since day one, it used the
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traditional a.out-style core dump format before NetBSD 1.6. */
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/* Sizeof `struct reg' in <machine/reg.h>. */
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#define ALPHANBSD_SIZEOF_GREGS (32 * 8)
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/* Sizeof `struct fpreg' in <machine/reg.h. */
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#define ALPHANBSD_SIZEOF_FPREGS ((32 * 8) + 8)
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/* Supply register REGNUM from the buffer specified by FPREGS and LEN
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in the floating-point register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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alphanbsd_supply_fpregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *fpregs, size_t len)
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{
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const gdb_byte *regs = fpregs;
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int i;
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gdb_assert (len >= ALPHANBSD_SIZEOF_FPREGS);
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for (i = ALPHA_FP0_REGNUM; i < ALPHA_FP0_REGNUM + 31; i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i, regs + (i - ALPHA_FP0_REGNUM) * 8);
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}
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if (regnum == ALPHA_FPCR_REGNUM || regnum == -1)
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regcache_raw_supply (regcache, ALPHA_FPCR_REGNUM, regs + 32 * 8);
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}
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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in the general-purpose register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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alphanbsd_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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const gdb_byte *regs = gregs;
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int i;
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gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);
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for (i = 0; i < ALPHA_ZERO_REGNUM; i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i, regs + i * 8);
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}
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if (regnum == ALPHA_PC_REGNUM || regnum == -1)
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regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
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}
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/* Supply register REGNUM from the buffer specified by GREGS and LEN
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in the general-purpose register set REGSET to register cache
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REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
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static void
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alphanbsd_aout_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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const gdb_byte *regs = gregs;
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int i;
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/* Table to map a GDB register number to a trapframe register index. */
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static const int regmap[] =
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{
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0, 1, 2, 3,
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4, 5, 6, 7,
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8, 9, 10, 11,
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12, 13, 14, 15,
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30, 31, 32, 16,
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17, 18, 19, 20,
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21, 22, 23, 24,
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25, 29, 26
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};
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gdb_assert (len >= ALPHANBSD_SIZEOF_GREGS);
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for (i = 0; i < ARRAY_SIZE(regmap); i++)
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{
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if (regnum == i || regnum == -1)
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regcache_raw_supply (regcache, i, regs + regmap[i] * 8);
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}
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if (regnum == ALPHA_PC_REGNUM || regnum == -1)
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regcache_raw_supply (regcache, ALPHA_PC_REGNUM, regs + 31 * 8);
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if (len >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
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{
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regs += ALPHANBSD_SIZEOF_GREGS;
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len -= ALPHANBSD_SIZEOF_GREGS;
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alphanbsd_supply_fpregset (regset, regcache, regnum, regs, len);
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}
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}
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/* NetBSD/alpha register sets. */
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static struct regset alphanbsd_gregset =
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{
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NULL,
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alphanbsd_supply_gregset
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};
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static struct regset alphanbsd_fpregset =
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{
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NULL,
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alphanbsd_supply_fpregset
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};
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static struct regset alphanbsd_aout_gregset =
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{
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NULL,
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alphanbsd_aout_supply_gregset
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};
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/* Return the appropriate register set for the core section identified
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by SECT_NAME and SECT_SIZE. */
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const struct regset *
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alphanbsd_regset_from_core_section (struct gdbarch *gdbarch,
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const char *sect_name, size_t sect_size)
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{
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if (strcmp (sect_name, ".reg") == 0 && sect_size >= ALPHANBSD_SIZEOF_GREGS)
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{
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if (sect_size >= ALPHANBSD_SIZEOF_GREGS + ALPHANBSD_SIZEOF_FPREGS)
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return &alphanbsd_aout_gregset;
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else
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return &alphanbsd_gregset;
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}
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if (strcmp (sect_name, ".reg2") == 0 && sect_size >= ALPHANBSD_SIZEOF_FPREGS)
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return &alphanbsd_fpregset;
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return NULL;
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}
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static void
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alphanbsd_sigtramp_cache_init (const struct tramp_frame *,
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struct frame_info *,
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struct trad_frame_cache *,
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CORE_ADDR);
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/* Under NetBSD/alpha signal handler invocations can be identified by the
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designated code sequence that is used to return from a signal handler.
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In particular, the return address of a signal handler points to the
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following code sequences. */
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static const struct tramp_frame alphanbsd_sigtramp_sc1 =
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{
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SIGTRAMP_FRAME,
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4,
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{
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{ 0xa61e0000, 0xffffffff }, /* ldq a0, 0(sp) */
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{ 0x23de0010, 0xffffffff }, /* lda sp, 16(sp) */
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{ 0x201f0127, 0xffffffff }, /* lda v0, 295 */
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{ 0x00000083, 0xffffffff }, /* call_pal callsys */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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alphanbsd_sigtramp_cache_init
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};
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/* The siginfo signal trampoline for NetBSD/alpha introduced in 2.0 */
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static const struct tramp_frame alphanbsd_sigtramp_si2 =
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{
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SIGTRAMP_FRAME,
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4,
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{
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{ 0x221e0080, -1 }, /* lda a0,128(sp) */
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{ 0x201f0134, -1 }, /* lda v0,308 */
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{ 0x00000083, -1 }, /* callsys */
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{ 0x47e00410, -1 }, /* mov v0,a0 */
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{ 0x201f0001, -1 }, /* lda v0,1 */
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{ 0x00000083, -1 }, /* callsys */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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alphanbsd_sigtramp_cache_init
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};
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/* The siginfo signal trampoline for NetBSD/alpha introduced in 4.0 */
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static const struct tramp_frame alphanbsd_sigtramp_si4 =
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{
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SIGTRAMP_FRAME,
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4,
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{
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{ 0x27ba0000, 0xffff0000 },
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{ 0x23bd0000, 0xffff0000 }, /* ldgp gp,0(ra) */
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{ 0x221e0080, -1 }, /* lda a0,128(sp) */
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{ 0x201f0134, -1 }, /* lda v0,308 */
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{ 0x00000083, -1 }, /* callsys */
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{ 0x221fffff, -1 }, /* lda a0,-1 */
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{ 0x201f0001, -1 }, /* lda v0,1 */
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{ 0x00000083, -1 }, /* callsys */
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{ TRAMP_SENTINEL_INSN, -1 }
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},
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alphanbsd_sigtramp_cache_init
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};
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static void
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alphanbsd_sigtramp_cache_init (const struct tramp_frame *self,
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struct frame_info *next_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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struct gdbarch *gdbarch = get_frame_arch (next_frame);
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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CORE_ADDR addr, sp;
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int i;
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sp = frame_unwind_register_unsigned (next_frame, SP_REGNUM);
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if (self == &alphanbsd_sigtramp_sc1) {
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addr = sp;
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} else {
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addr = sp + 128 + 56;
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}
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for (i = 0; i < 32; i++, addr += ALPHA_REGISTER_SIZE)
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{
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trad_frame_set_reg_addr (this_cache, i, addr);
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}
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trad_frame_set_reg_addr (this_cache, ALPHA_PC_REGNUM, addr);
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/* Construct the frame ID using the function start. */
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trad_frame_set_id (this_cache, frame_id_build (sp, func));
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}
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static void
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alphanbsd_init_abi (struct gdbarch_info info,
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struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Hook into the DWARF CFI frame unwinder. */
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alpha_dwarf2_init_abi (info, gdbarch);
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/* Hook into the MDEBUG frame unwinder. */
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alpha_mdebug_init_abi (info, gdbarch);
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/* NetBSD/alpha does not provide single step support via ptrace(2); we
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must use software single-stepping. */
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set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
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/* NetBSD/alpha has SVR4-style shared libraries. */
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_lp64_fetch_link_map_offsets);
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tdep->jb_pc = 2;
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tdep->jb_elt_size = 8;
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set_gdbarch_regset_from_core_section
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(gdbarch, alphanbsd_regset_from_core_section);
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tramp_frame_prepend_unwinder (gdbarch, &alphanbsd_sigtramp_sc1);
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tramp_frame_prepend_unwinder (gdbarch, &alphanbsd_sigtramp_si2);
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tramp_frame_prepend_unwinder (gdbarch, &alphanbsd_sigtramp_si4);
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}
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void
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_initialize_alphanbsd_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_NETBSD_ELF,
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alphanbsd_init_abi);
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gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OPENBSD_ELF,
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alphanbsd_init_abi);
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}
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