/* Target-dependent code for i386 BSD's.
- Copyright 2001 Free Software Foundation, Inc.
+
+ Copyright 2001, 2002, 2003, 2004 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"
+
+#include "gdb_string.h"
+
+#include "i386-tdep.h"
/* Support for signal handlers. */
-/* 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. */
+/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
+ routine, return the address of the associated sigcontext structure. */
-CORE_ADDR i386bsd_sigtramp_start = 0xbfbfdf20;
-CORE_ADDR i386bsd_sigtramp_end = 0xbfbfdff0;
+static CORE_ADDR
+i386bsd_sigcontext_addr (struct frame_info *next_frame)
+{
+ char buf[4];
+ CORE_ADDR sp;
-/* Return whether PC is in a BSD sigtramp routine. */
+ frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
+ sp = extract_unsigned_integer (buf, 4);
+
+ return read_memory_unsigned_integer (sp + 8, 4);
+}
+\f
+
+/* Support for shared libraries. */
+
+/* Return non-zero if we are in a shared library trampoline code stub. */
int
-i386bsd_in_sigtramp (CORE_ADDR pc, char *name)
+i386bsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
{
- return (pc >= i386bsd_sigtramp_start && pc < i386bsd_sigtramp_end);
+ return (name && !strcmp (name, "_DYNAMIC"));
}
-/* Offset in the sigcontext structure of the program counter.
- Initialized to the value from 4.4 BSD Lite. */
-int i386bsd_sigcontext_pc_offset = 20;
+/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
-/* Assuming FRAME is for a BSD sigtramp routine, return the address of
- the associated sigcontext structure. */
-
-static CORE_ADDR
-i386bsd_sigcontext_addr (struct frame_info *frame)
+/* From <machine/signal.h>. */
+int i386bsd_sc_reg_offset[] =
{
- 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);
+ -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);
+
+ /* 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 = ARRAY_SIZE (i386bsd_sc_reg_offset);
}
-/* Assuming FRAME is for a BSD sigtramp routine, return the saved
- program counter. */
+\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;
-static CORE_ADDR
-i386bsd_sigtramp_saved_pc (struct frame_info *frame)
+ return GDB_OSABI_UNKNOWN;
+}
+
+static enum gdb_osabi
+i386bsd_core_osabi_sniffer (bfd *abfd)
{
- CORE_ADDR addr;
- addr = i386bsd_sigcontext_addr (frame);
- return read_memory_unsigned_integer (addr + i386bsd_sigcontext_pc_offset, 4);
+ if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
+ return GDB_OSABI_NETBSD_AOUT;
+
+ return GDB_OSABI_UNKNOWN;
}
-/* Return the saved program counter for FRAME. */
+\f
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_i386bsd_tdep (void);
-CORE_ADDR
-i386bsd_frame_saved_pc (struct frame_info *frame)
+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);
+ /* BFD doesn't set a flavour for NetBSD style a.out core files. */
+ gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_unknown_flavour,
+ i386bsd_core_osabi_sniffer);
}