/* Target-dependent code for NetBSD/i386.
- Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002,
- 2003, 2004
- Free Software Foundation, Inc.
+ Copyright (C) 1988-2016 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 "arch-utils.h"
+#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
#include "regset.h"
#include "osabi.h"
-
-#include "gdb_assert.h"
-#include "gdb_string.h"
+#include "symtab.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
#include "i386-tdep.h"
#include "i387-tdep.h"
15 * 4 /* %gs */
};
-static void
-i386nbsd_aout_supply_regset (const struct regset *regset,
- struct regcache *regcache, int regnum,
- const void *regs, size_t len)
+/* From <machine/signal.h>. */
+int i386nbsd_sc_reg_offset[] =
{
- const struct gdbarch_tdep *tdep = regset->descr;
+ 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 */
+};
- gdb_assert (len >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE);
+/* From <machine/mcontext.h>. */
+int i386nbsd_mc_reg_offset[] =
+{
+ 11 * 4, /* %eax */
+ 10 * 4, /* %ecx */
+ 9 * 4, /* %edx */
+ 8 * 4, /* %ebx */
+ 7 * 4, /* %esp */
+ 6 * 4, /* %ebp */
+ 5 * 4, /* %esi */
+ 4 * 4, /* %edi */
+ 14 * 4, /* %eip */
+ 16 * 4, /* %eflags */
+ 15 * 4, /* %cs */
+ 18 * 4, /* %ss */
+ 3 * 4, /* %ds */
+ 2 * 4, /* %es */
+ 1 * 4, /* %fs */
+ 0 * 4 /* %gs */
+};
- i386_supply_gregset (regset, regcache, regnum, regs, tdep->sizeof_gregset);
- i387_supply_fsave (regcache, regnum, (char *) regs + tdep->sizeof_gregset);
-}
+static void i386nbsd_sigtramp_cache_init (const struct tramp_frame *,
+ struct frame_info *,
+ struct trad_frame_cache *,
+ CORE_ADDR);
-static const struct regset *
-i386nbsd_aout_regset_from_core_section (struct gdbarch *gdbarch,
- const char *sect_name,
- size_t sect_size)
+static const struct tramp_frame i386nbsd_sigtramp_sc16 =
{
- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ SIGTRAMP_FRAME,
+ 1,
+ {
+ { 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x10, -1 },
+ /* leal 0x10(%esp), %eax */
+ { 0x50, -1 }, /* pushl %eax */
+ { 0x50, -1 }, /* pushl %eax */
+ { 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x127, %eax # __sigreturn14 */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x1, %eax # exit */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ i386nbsd_sigtramp_cache_init
+};
- /* NetBSD a.out core dumps don't use seperate register sets for the
- general-purpose and floating-point registers. */
+static const struct tramp_frame i386nbsd_sigtramp_sc2 =
+{
+ SIGTRAMP_FRAME,
+ 1,
+ {
+ { 0x8d, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x0c, -1 },
+ /* leal 0x0c(%esp), %eax */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x27, -1 }, {0x01, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x127, %eax # __sigreturn14 */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x1, %eax */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ i386nbsd_sigtramp_cache_init
+};
- if (strcmp (sect_name, ".reg") == 0
- && sect_size >= tdep->sizeof_gregset + I387_SIZEOF_FSAVE)
- {
- if (tdep->gregset == NULL)
- {
- tdep->gregset = XMALLOC (struct regset);
- tdep->gregset->descr = tdep;
- tdep->gregset->supply_regset = i386nbsd_aout_supply_regset;
- }
- return tdep->gregset;
- }
+static const struct tramp_frame i386nbsd_sigtramp_si2 =
+{
+ SIGTRAMP_FRAME,
+ 1,
+ {
+ { 0x8b, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x08, -1 },
+ /* movl 8(%esp),%eax */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* movl $0x134, %eax # setcontext */
+ { 0xcd, -1 }, { 0x80, -1 },
+ /* int $0x80 */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* movl $0x1, %eax */
+ { 0xcd, -1 }, { 0x80, -1 },
+ /* int $0x80 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ i386nbsd_sigtramp_cache_init
+};
- return NULL;
-}
+static const struct tramp_frame i386nbsd_sigtramp_si31 =
+{
+ SIGTRAMP_FRAME,
+ 1,
+ {
+ { 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
+ { 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* leal 0x8c(%esp), %eax */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* movl $0x134, %eax # setcontext */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x1, %eax */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ i386nbsd_sigtramp_cache_init
+};
-/* 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:
-
- leal 0x10(%esp), %eax
- pushl %eax
- pushl %eax
- movl $0x127, %eax # __sigreturn14
- int $0x80
-
- 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
-
-#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[] =
+static const struct tramp_frame i386nbsd_sigtramp_si4 =
{
- RETCODE_INSN1, 0x44, 0x24, 0x10,
- RETCODE_INSN2,
- RETCODE_INSN3,
- RETCODE_INSN4, 0x27, 0x01, 0x00, 0x00,
- RETCODE_INSN5, 0x80,
+ SIGTRAMP_FRAME,
+ 1,
+ {
+ { 0x8d, -1 }, { 0x84, -1 }, { 0x24, -1 },
+ { 0x8c, -1 }, { 0x00, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* leal 0x8c(%esp), %eax */
+ { 0x89, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ /* movl %eax, 0x4(%esp) */
+ { 0xb8, -1 }, { 0x34, -1 }, { 0x01, -1 }, { 0x00, -1 }, { 0x00, -1 },
+ /* movl $0x134, %eax # setcontext */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { 0xc7, -1 }, { 0x44, -1 }, { 0x24, -1 }, { 0x04, -1 },
+ { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 }, { 0xff, -1 },
+ /* movl $0xffffffff,0x4(%esp) */
+ { 0xb8, -1 }, { 0x01, -1 }, {0x00, -1 }, {0x00, -1 }, {0x00, -1 },
+ /* movl $0x1, %eax */
+ { 0xcd, -1 }, { 0x80, -1},
+ /* int $0x80 */
+ { TRAMP_SENTINEL_INSN, -1 }
+ },
+ i386nbsd_sigtramp_cache_init
};
-static LONGEST
-i386nbsd_sigtramp_offset (CORE_ADDR pc)
+static void
+i386nbsd_sigtramp_cache_init (const struct tramp_frame *self,
+ struct frame_info *this_frame,
+ struct trad_frame_cache *this_cache,
+ CORE_ADDR func)
{
- unsigned char ret[sizeof(sigtramp_retcode)], insn;
- LONGEST off;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+ CORE_ADDR sp = get_frame_register_unsigned (this_frame, I386_ESP_REGNUM);
+ CORE_ADDR base;
+ int *reg_offset;
+ int num_regs;
int i;
- if (read_memory_nobpt (pc, &insn, 1) != 0)
- return -1;
-
- switch (insn)
+ if (self == &i386nbsd_sigtramp_sc16 || self == &i386nbsd_sigtramp_sc2)
{
- case RETCODE_INSN1:
- off = 0;
- break;
-
- 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 (read_memory_nobpt (pc + 1, &insn, 1) != 0)
- return -1;
-
- if (insn == RETCODE_INSN3)
- off = RETCODE_INSN2_OFF;
- else
- off = RETCODE_INSN3_OFF;
- break;
-
- case RETCODE_INSN4:
- off = RETCODE_INSN4_OFF;
- break;
-
- case RETCODE_INSN5:
- off = RETCODE_INSN5_OFF;
- break;
-
- default:
- return -1;
- }
-
- pc -= off;
+ reg_offset = i386nbsd_sc_reg_offset;
+ num_regs = ARRAY_SIZE (i386nbsd_sc_reg_offset);
- if (read_memory_nobpt (pc, (char *) ret, sizeof (ret)) != 0)
- return -1;
+ /* Read in the sigcontext address. */
+ base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
+ }
+ else
+ {
+ reg_offset = i386nbsd_mc_reg_offset;
+ num_regs = ARRAY_SIZE (i386nbsd_mc_reg_offset);
- if (memcmp (ret, sigtramp_retcode, sizeof (ret)) == 0)
- return off;
+ /* Read in the ucontext address. */
+ base = read_memory_unsigned_integer (sp + 8, 4, byte_order);
+ /* offsetof(ucontext_t, uc_mcontext) == 36 */
+ base += 36;
+ }
- return -1;
-}
+ for (i = 0; i < num_regs; i++)
+ if (reg_offset[i] != -1)
+ trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
-static int
-i386nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
-{
- return (nbsd_pc_in_sigtramp (pc, name)
- || i386nbsd_sigtramp_offset (pc) >= 0);
+ /* Construct the frame ID using the function start. */
+ trad_frame_set_id (this_cache, frame_id_build (sp, func));
}
-
-/* From <machine/signal.h>. */
-int i386nbsd_sc_reg_offset[] =
-{
- 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 */
-};
+\f
static void
i386nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
tdep->gregset_num_regs = ARRAY_SIZE (i386nbsd_r_reg_offset);
tdep->sizeof_gregset = 16 * 4;
- /* NetBSD has different signal trampoline conventions. */
- set_gdbarch_pc_in_sigtramp (gdbarch, i386nbsd_pc_in_sigtramp);
- /* FIXME: kettenis/20020906: We should probably provide
- NetBSD-specific versions of these functions if we want to
- recognize signal trampolines that live on the stack. */
- set_gdbarch_sigtramp_start (gdbarch, NULL);
- set_gdbarch_sigtramp_end (gdbarch, NULL);
-
/* NetBSD uses -freg-struct-return by default. */
tdep->struct_return = reg_struct_return;
- /* NetBSD has a `struct sigcontext' that's different from the
- origional 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 uses tramp_frame sniffers for signal trampolines. */
+ tdep->sigcontext_addr= 0;
+ tdep->sigtramp_start = 0;
+ tdep->sigtramp_end = 0;
+ tdep->sigtramp_p = 0;
+ tdep->sc_reg_offset = 0;
+ tdep->sc_num_regs = 0;
+
+ tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc16);
+ tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_sc2);
+ tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si2);
+ tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si31);
+ tramp_frame_prepend_unwinder (gdbarch, &i386nbsd_sigtramp_si4);
}
/* NetBSD ELF. */
i386_elf_init_abi (info, gdbarch);
/* NetBSD ELF uses SVR4-style shared libraries. */
- set_gdbarch_in_solib_call_trampoline
- (gdbarch, generic_in_solib_call_trampoline);
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_ilp32_fetch_link_map_offsets);
tdep->struct_return = pcc_struct_return;
}
+/* Provide a prototype to silence -Wmissing-prototypes. */
+extern initialize_file_ftype _initialize_i386nbsd_tdep;
+
void
_initialize_i386nbsd_tdep (void)
{
- 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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