-/* Target-dependent code for NetBSD/i386, for GDB.
- Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002
- Free Software Foundation, Inc.
+/* Target-dependent code for NetBSD/i386.
+
+ Copyright (C) 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002, 2003,
+ 2004, 2007 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
+ 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,
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. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
-#include "gdbtypes.h"
+#include "arch-utils.h"
+#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
+#include "regset.h"
+#include "osabi.h"
+#include "symtab.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+#include "i386-tdep.h"
#include "i387-tdep.h"
+#include "nbsd-tdep.h"
+#include "solib-svr4.h"
-/* Map a GDB register number to an offset in the reg structure. */
-static int regmap[] =
+/* From <machine/reg.h>. */
+static int i386nbsd_r_reg_offset[] =
{
- ( 0 * 4), /* %eax */
- ( 1 * 4), /* %ecx */
- ( 2 * 4), /* %edx */
- ( 3 * 4), /* %ebx */
- ( 4 * 4), /* %esp */
- ( 5 * 4), /* %epb */
- ( 6 * 4), /* %esi */
- ( 7 * 4), /* %edi */
- ( 8 * 4), /* %eip */
- ( 9 * 4), /* %eflags */
- (10 * 4), /* %cs */
- (11 * 4), /* %ss */
- (12 * 4), /* %ds */
- (13 * 4), /* %es */
- (14 * 4), /* %fs */
- (15 * 4), /* %gs */
+ 0 * 4, /* %eax */
+ 1 * 4, /* %ecx */
+ 2 * 4, /* %edx */
+ 3 * 4, /* %ebx */
+ 4 * 4, /* %esp */
+ 5 * 4, /* %ebp */
+ 6 * 4, /* %esi */
+ 7 * 4, /* %edi */
+ 8 * 4, /* %eip */
+ 9 * 4, /* %eflags */
+ 10 * 4, /* %cs */
+ 11 * 4, /* %ss */
+ 12 * 4, /* %ds */
+ 13 * 4, /* %es */
+ 14 * 4, /* %fs */
+ 15 * 4 /* %gs */
};
-#define SIZEOF_STRUCT_REG (16 * 4)
-
static void
-i386nbsd_supply_reg (char *regs, int regno)
+i386nbsd_aout_supply_regset (const struct regset *regset,
+ struct regcache *regcache, int regnum,
+ const void *regs, size_t len)
{
- int i;
+ const struct gdbarch_tdep *tdep = gdbarch_tdep (regset->arch);
- for (i = 0; i <= 15; i++)
- if (regno == i || regno == -1)
- supply_register (i, regs + regmap[i]);
+ gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE);
+
+ i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset);
+ i387_supply_fsave (regcache, regnum, (char *) regs + tdep->sizeof_gregset);
}
-static void
-fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
- CORE_ADDR ignore)
+static const struct regset *
+i386nbsd_aout_regset_from_core_section (struct gdbarch *gdbarch,
+ const char *sect_name,
+ size_t sect_size)
{
- char *regs, *fsave;
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
- /* We get everything from one section. */
- if (which != 0)
- return;
+ /* NetBSD a.out core dumps don't use seperate register sets for the
+ general-purpose and floating-point registers. */
- if (core_reg_size < (SIZEOF_STRUCT_REG + 108))
+ if (strcmp (sect_name, ".reg") == 0
+ && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE)
{
- warning ("Wrong size register set in core file.");
- return;
+ if (tdep->gregset == NULL)
+ tdep->gregset =
+ regset_alloc (gdbarch, i386nbsd_aout_supply_regset, NULL);
+ return tdep->gregset;
}
- regs = core_reg_sect;
- fsave = core_reg_sect + SIZEOF_STRUCT_REG;
+ return NULL;
+}
+
+/* Under NetBSD/i386, 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:
- /* Integer registers. */
- i386nbsd_supply_reg (regs, -1);
+ leal 0x10(%esp), %eax
+ pushl %eax
+ pushl %eax
+ movl $0x127, %eax # __sigreturn14
+ int $0x80
- /* Floating point registers. */
- i387_supply_fsave (fsave);
-}
+ 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_INSN1 0x8d
+#define RETCODE_INSN2 0x50
+#define RETCODE_INSN3 0x50
+#define RETCODE_INSN4 0xb8
+#define RETCODE_INSN5 0xcd
-static void
-fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size,
- int which, CORE_ADDR ignore)
+#define RETCODE_INSN2_OFF 4
+#define RETCODE_INSN3_OFF 5
+#define RETCODE_INSN4_OFF 6
+#define RETCODE_INSN5_OFF 11
+
+static const unsigned char sigtramp_retcode[] =
+{
+ RETCODE_INSN1, 0x44, 0x24, 0x10,
+ RETCODE_INSN2,
+ RETCODE_INSN3,
+ RETCODE_INSN4, 0x27, 0x01, 0x00, 0x00,
+ RETCODE_INSN5, 0x80,
+};
+
+static LONGEST
+i386nbsd_sigtramp_offset (struct frame_info *next_frame)
{
- switch (which)
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ unsigned char ret[sizeof(sigtramp_retcode)], insn;
+ LONGEST off;
+ int i;
+
+ if (!safe_frame_unwind_memory (next_frame, pc, &insn, 1))
+ return -1;
+
+ switch (insn)
{
- case 0: /* Integer registers. */
- if (core_reg_size != SIZEOF_STRUCT_REG)
- warning ("Wrong size register set in core file.");
- else
- i386nbsd_supply_reg (core_reg_sect, -1);
+ case RETCODE_INSN1:
+ off = 0;
break;
- case 2: /* Floating point registers. */
- if (core_reg_size != 108)
- warning ("Wrong size FP register set in core file.");
+ case RETCODE_INSN2:
+ /* INSN2 and INSN3 are the same. Read at the location of PC+1
+ to determine if we're actually looking at INSN2 or INSN3. */
+ if (!safe_frame_unwind_memory (next_frame, pc + 1, &insn, 1))
+ return -1;
+
+ if (insn == RETCODE_INSN3)
+ off = RETCODE_INSN2_OFF;
else
- i387_supply_fsave (core_reg_sect);
+ off = RETCODE_INSN3_OFF;
break;
- case 3: /* "Extended" floating point registers. This is gdb-speak
- for SSE/SSE2. */
- if (core_reg_size != 512)
- warning ("Wrong size XMM register set in core file.");
- else
- i387_supply_fxsave (core_reg_sect);
+ case RETCODE_INSN4:
+ off = RETCODE_INSN4_OFF;
break;
- default:
- /* Don't know what kind of register request this is; just ignore it. */
+ case RETCODE_INSN5:
+ off = RETCODE_INSN5_OFF;
break;
+
+ default:
+ return -1;
}
+
+ pc -= off;
+
+ if (!safe_frame_unwind_memory (next_frame, pc, ret, sizeof (ret)))
+ return -1;
+
+ if (memcmp (ret, sigtramp_retcode, sizeof (ret)) == 0)
+ return off;
+
+ return -1;
}
-static struct core_fns i386nbsd_core_fns =
+/* Return whether the frame preceding NEXT_FRAME corresponds to a
+ NetBSD sigtramp routine. */
+
+static int
+i386nbsd_sigtramp_p (struct frame_info *next_frame)
{
- bfd_target_unknown_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- fetch_core_registers, /* core_read_registers */
- NULL /* next */
-};
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+ char *name;
+
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ return (nbsd_pc_in_sigtramp (pc, name)
+ || i386nbsd_sigtramp_offset (next_frame) >= 0);
+}
-static struct core_fns i386nbsd_elfcore_fns =
+/* From <machine/signal.h>. */
+int i386nbsd_sc_reg_offset[] =
{
- bfd_target_elf_flavour, /* core_flavour */
- default_check_format, /* check_format */
- default_core_sniffer, /* core_sniffer */
- fetch_elfcore_registers, /* core_read_registers */
- NULL /* next */
+ 10 * 4, /* %eax */
+ 9 * 4, /* %ecx */
+ 8 * 4, /* %edx */
+ 7 * 4, /* %ebx */
+ 14 * 4, /* %esp */
+ 6 * 4, /* %ebp */
+ 5 * 4, /* %esi */
+ 4 * 4, /* %edi */
+ 11 * 4, /* %eip */
+ 13 * 4, /* %eflags */
+ 12 * 4, /* %cs */
+ 15 * 4, /* %ss */
+ 3 * 4, /* %ds */
+ 2 * 4, /* %es */
+ 1 * 4, /* %fs */
+ 0 * 4 /* %gs */
};
+static void
+i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* Obviously NetBSD is BSD-based. */
+ i386bsd_init_abi (info, gdbarch);
+
+ /* NetBSD has a different `struct reg'. */
+ tdep->gregset_reg_offset = i386nbsd_r_reg_offset;
+ tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
+ tdep->sizeof_gregset = 16 * 4;
+
+ /* NetBSD has different signal trampoline conventions. */
+ tdep->sigtramp_start = 0;
+ tdep->sigtramp_end = 0;
+ tdep->sigtramp_p = i386nbsd_sigtramp_p;
+
+ /* NetBSD uses -freg-struct-return by default. */
+ tdep->struct_return = reg_struct_return;
+
+ /* NetBSD has a `struct sigcontext' that's different from the
+ original 4.3 BSD. */
+ tdep->sc_reg_offset = i386nbsd_sc_reg_offset;
+ tdep->sc_num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
+}
+
+/* NetBSD a.out. */
+
+static void
+i386nbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ i386nbsd_init_abi (info, gdbarch);
+
+ /* NetBSD a.out has a single register set. */
+ set_gdbarch_regset_from_core_section
+ (gdbarch, i386nbsd_aout_regset_from_core_section);
+}
+
+/* NetBSD ELF. */
+
+static void
+i386nbsdelf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* It's still NetBSD. */
+ i386nbsd_init_abi (info, gdbarch);
+
+ /* But ELF-based. */
+ i386_elf_init_abi (info, gdbarch);
+
+ /* NetBSD ELF uses SVR4-style shared libraries. */
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_ilp32_fetch_link_map_offsets);
+
+ /* NetBSD ELF uses -fpcc-struct-return by default. */
+ tdep->struct_return = pcc_struct_return;
+}
+
void
_initialize_i386nbsd_tdep (void)
{
- add_core_fns (&i386nbsd_core_fns);
- add_core_fns (&i386nbsd_elfcore_fns);
+ gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_AOUT,
+ i386nbsdaout_init_abi);
+ gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_NETBSD_ELF,
+ i386nbsdelf_init_abi);
}
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