/* Target-dependent code for i386 BSD's.
- Copyright 2001 Free Software Foundation, Inc.
+ Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of GDB.
Boston, MA 02111-1307, USA. */
#include "defs.h"
+#include "arch-utils.h"
#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
+#include "osabi.h"
-/* Support for signal handlers. */
+#include "gdb_string.h"
-/* Range in which to find the signaltramp routine, traditionally found
- on the use stack, just below the user area. Initialized to values
- that work for NetBSD and FreeBSD. */
+#include "i386-tdep.h"
-CORE_ADDR i386bsd_sigtramp_start = 0xbfbfdf20;
-CORE_ADDR i386bsd_sigtramp_end = 0xbfbfdff0;
+/* Support for signal handlers. */
/* Return whether PC is in a BSD sigtramp routine. */
-int
-i386bsd_in_sigtramp (CORE_ADDR pc, char *name)
+static int
+i386bsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
{
- return (pc >= i386bsd_sigtramp_start && pc < i386bsd_sigtramp_end);
-}
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
-/* Offset in the sigcontext structure of the program counter.
- Initialized to the value from 4.4 BSD Lite. */
-int i386bsd_sigcontext_pc_offset = 20;
+ return (pc >= tdep->sigtramp_start && pc < tdep->sigtramp_end);
+}
-/* Assuming FRAME is for a BSD sigtramp routine, return the address of
- the associated sigcontext structure. */
+/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
+ routine, return the address of the associated sigcontext structure. */
static CORE_ADDR
-i386bsd_sigcontext_addr (struct frame_info *frame)
+i386bsd_sigcontext_addr (struct frame_info *next_frame)
{
- if (frame->next)
- /* If this isn't the top frame, the next frame must be for the
- signal handler itself. A pointer to the sigcontext structure
- is passed as the third argument to the signal handler. */
- return read_memory_unsigned_integer (frame->next->frame + 16, 4);
-
- /* This is the top frame. We'll have to find the address of the
- sigcontext structure by looking at the stack pointer. */
- return read_memory_unsigned_integer (read_register (SP_REGNUM) + 8, 4);
+ char buf[4];
+ CORE_ADDR sp;
+
+ frame_unwind_register (next_frame, SP_REGNUM, buf);
+ sp = extract_unsigned_integer (buf, 4);
+
+ return read_memory_unsigned_integer (sp + 8, 4);
}
-/* Assuming FRAME is for a BSD sigtramp routine, return the saved
- program counter. */
+/* Return the start address of the sigtramp routine. */
-static CORE_ADDR
-i386bsd_sigtramp_saved_pc (struct frame_info *frame)
+CORE_ADDR
+i386bsd_sigtramp_start (CORE_ADDR pc)
{
- CORE_ADDR addr;
- addr = i386bsd_sigcontext_addr (frame);
- return read_memory_unsigned_integer (addr + i386bsd_sigcontext_pc_offset, 4);
+ return gdbarch_tdep (current_gdbarch)->sigtramp_start;
}
-/* Return the saved program counter for FRAME. */
+/* Return the end address of the sigtramp routine. */
CORE_ADDR
-i386bsd_frame_saved_pc (struct frame_info *frame)
+i386bsd_sigtramp_end (CORE_ADDR pc)
+{
+ return gdbarch_tdep (current_gdbarch)->sigtramp_end;
+}
+\f
+
+/* Support for shared libraries. */
+
+/* Return non-zero if we are in a shared library trampoline code stub. */
+
+int
+i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
+{
+ return (name && !strcmp (name, "_DYNAMIC"));
+}
+
+/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
+
+/* From <machine/signal.h>. */
+int i386bsd_sc_reg_offset[I386_NUM_GREGS] =
+{
+ -1, /* %eax */
+ -1, /* %ecx */
+ -1, /* %edx */
+ -1, /* %ebx */
+ 8 + 0 * 4, /* %esp */
+ 8 + 1 * 4, /* %ebp */
+ -1, /* %esi */
+ -1, /* %edi */
+ 8 + 3 * 4, /* %eip */
+ 8 + 4 * 4, /* %eflags */
+ -1, /* %cs */
+ -1, /* %ss */
+ -1, /* %ds */
+ -1, /* %es */
+ -1, /* %fs */
+ -1 /* %gs */
+};
+
+void
+i386bsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ set_gdbarch_pc_in_sigtramp (gdbarch, i386bsd_pc_in_sigtramp);
+
+ /* Allow the recognition of sigtramps as a function named <sigtramp>. */
+ set_gdbarch_sigtramp_start (gdbarch, i386bsd_sigtramp_start);
+ set_gdbarch_sigtramp_end (gdbarch, i386bsd_sigtramp_end);
+
+ /* Assume SunOS-style shared libraries. */
+ set_gdbarch_in_solib_call_trampoline (gdbarch,
+ i386bsd_aout_in_solib_call_trampoline);
+
+ tdep->jb_pc_offset = 0;
+
+ tdep->sigtramp_start = 0xfdbfdfc0;
+ tdep->sigtramp_end = 0xfdbfe000;
+ tdep->sigcontext_addr = i386bsd_sigcontext_addr;
+ tdep->sc_reg_offset = i386bsd_sc_reg_offset;
+ tdep->sc_num_regs = I386_NUM_GREGS;
+}
+
+/* FreeBSD 3.0-RELEASE or later. */
+
+CORE_ADDR i386fbsd_sigtramp_start = 0xbfbfdf20;
+CORE_ADDR i386fbsd_sigtramp_end = 0xbfbfdff0;
+
+/* From <machine/signal.h>. */
+int i386fbsd_sc_reg_offset[I386_NUM_GREGS] =
+{
+ 8 + 14 * 4, /* %eax */
+ 8 + 13 * 4, /* %ecx */
+ 8 + 12 * 4, /* %edx */
+ 8 + 11 * 4, /* %ebx */
+ 8 + 0 * 4, /* %esp */
+ 8 + 1 * 4, /* %ebp */
+ 8 + 10 * 4, /* %esi */
+ 8 + 9 * 4, /* %edi */
+ 8 + 3 * 4, /* %eip */
+ 8 + 4 * 4, /* %eflags */
+ 8 + 7 * 4, /* %cs */
+ 8 + 8 * 4, /* %ss */
+ 8 + 6 * 4, /* %ds */
+ 8 + 5 * 4, /* %es */
+ 8 + 15 * 4, /* %fs */
+ 8 + 16 * 4 /* %gs */
+};
+
+static void
+i386fbsdaout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* Obviously FreeBSD is BSD-based. */
+ i386bsd_init_abi (info, gdbarch);
+
+ /* FreeBSD uses -freg-struct-return by default. */
+ tdep->struct_return = reg_struct_return;
+
+ /* FreeBSD uses a different memory layout. */
+ tdep->sigtramp_start = i386fbsd_sigtramp_start;
+ tdep->sigtramp_end = i386fbsd_sigtramp_end;
+
+ /* FreeBSD has a more complete `struct sigcontext'. */
+ tdep->sc_reg_offset = i386fbsd_sc_reg_offset;
+ tdep->sc_num_regs = I386_NUM_GREGS;
+}
+
+static void
+i386fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ /* It's almost identical to FreeBSD a.out. */
+ i386fbsdaout_init_abi (info, gdbarch);
+
+ /* Except that it uses ELF. */
+ i386_elf_init_abi (info, gdbarch);
+
+ /* FreeBSD ELF uses SVR4-style shared libraries. */
+ set_gdbarch_in_solib_call_trampoline (gdbarch,
+ generic_in_solib_call_trampoline);
+}
+
+/* FreeBSD 4.0-RELEASE or later. */
+
+/* From <machine/signal.h>. */
+int i386fbsd4_sc_reg_offset[I386_NUM_GREGS] =
+{
+ 20 + 11 * 4, /* %eax */
+ 20 + 10 * 4, /* %ecx */
+ 20 + 9 * 4, /* %edx */
+ 20 + 8 * 4, /* %ebx */
+ 20 + 17 * 4, /* %esp */
+ 20 + 6 * 4, /* %ebp */
+ 20 + 5 * 4, /* %esi */
+ 20 + 4 * 4, /* %edi */
+ 20 + 14 * 4, /* %eip */
+ 20 + 16 * 4, /* %eflags */
+ 20 + 15 * 4, /* %cs */
+ 20 + 18 * 4, /* %ss */
+ 20 + 3 * 4, /* %ds */
+ 20 + 2 * 4, /* %es */
+ 20 + 1 * 4, /* %fs */
+ 20 + 0 * 4 /* %gs */
+};
+
+static void
+i386fbsd4_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* Inherit stuff from older releases. We assume that FreeBSD
+ 4.0-RELEASE always uses ELF. */
+ i386fbsd_init_abi (info, gdbarch);
+
+ /* FreeBSD 4.0 introduced a new `struct sigcontext'. */
+ tdep->sc_reg_offset = i386fbsd4_sc_reg_offset;
+ tdep->sc_num_regs = I386_NUM_GREGS;
+}
+
+\f
+static enum gdb_osabi
+i386bsd_aout_osabi_sniffer (bfd *abfd)
+{
+ if (strcmp (bfd_get_target (abfd), "a.out-i386-netbsd") == 0)
+ return GDB_OSABI_NETBSD_AOUT;
+
+ if (strcmp (bfd_get_target (abfd), "a.out-i386-freebsd") == 0)
+ return GDB_OSABI_FREEBSD_AOUT;
+
+ return GDB_OSABI_UNKNOWN;
+}
+
+\f
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_i386bsd_tdep (void);
+
+void
+_initialize_i386bsd_tdep (void)
{
- if (frame->signal_handler_caller)
- return i386bsd_sigtramp_saved_pc (frame);
+ gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
+ i386bsd_aout_osabi_sniffer);
- return read_memory_unsigned_integer (frame->frame + 4, 4);
+ gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT,
+ i386fbsdaout_init_abi);
+ gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF,
+ i386fbsd4_init_abi);
}
projects / deliverable / binutils-gdb.git / blobdiff