/* Target-dependent code for i386 BSD's.
- Copyright 2001, 2002 Free Software Foundation, Inc.
+ Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
This file is part of GDB.
#include "frame.h"
#include "gdbcore.h"
#include "regcache.h"
+#include "osabi.h"
+
+#include "gdb_string.h"
#include "i386-tdep.h"
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);
-}
-
-/* Assuming FRAME is for a BSD sigtramp routine, return the saved
- program counter.
+ char buf[4];
+ CORE_ADDR sp;
- Note: This function is used for Solaris 2 too, so don't make it
- static. */
-
-CORE_ADDR
-i386bsd_sigtramp_saved_pc (struct frame_info *frame)
-{
- int sc_pc_offset = gdbarch_tdep (current_gdbarch)->sc_pc_offset;
- CORE_ADDR addr;
+ frame_unwind_register (next_frame, I386_ESP_REGNUM, buf);
+ sp = extract_unsigned_integer (buf, 4);
- addr = i386bsd_sigcontext_addr (frame);
- return read_memory_unsigned_integer (addr + sc_pc_offset, 4);
+ return read_memory_unsigned_integer (sp + 8, 4);
}
/* Return the start address of the sigtramp routine. */
/* Traditional BSD (4.3 BSD, still used for BSDI and 386BSD). */
/* From <machine/signal.h>. */
-int i386bsd_sc_pc_offset = 20;
+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 */
+};
-static void
+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_saved_pc = i386bsd_sigtramp_saved_pc;
tdep->sigtramp_start = 0xfdbfdfc0;
tdep->sigtramp_end = 0xfdbfe000;
- tdep->sc_pc_offset = i386bsd_sc_pc_offset;
-}
-
-/* NetBSD 1.0 or later. */
-
-/* From <machine/signal.h>. */
-int i386nbsd_sc_pc_offset = 44;
-
-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 uses -freg-struct-return by default. */
- tdep->struct_return = reg_struct_return;
-
- /* NetBSD uses a different memory layout. */
- tdep->sigtramp_start = 0xbfbfdf20;
- tdep->sigtramp_end = 0xbfbfdff0;
-
- /* NetBSD has a `struct sigcontext' that's different from the
- origional 4.3 BSD. */
- tdep->sc_pc_offset = i386nbsd_sc_pc_offset;
-}
-
-/* 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_gdbarch_in_solib_call_trampoline (gdbarch,
- generic_in_solib_call_trampoline);
-
- /* NetBSD ELF uses -fpcc-struct-return by default. */
- tdep->struct_return = pcc_struct_return;
-
- /* We support the SSE registers on NetBSD ELF. */
- tdep->num_xmm_regs = I386_NUM_XREGS - 1;
- set_gdbarch_num_regs (gdbarch, I386_NUM_GREGS + I386_NUM_FREGS
- + I386_NUM_XREGS);
+ 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)
{
/* 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
/* FreeBSD 4.0-RELEASE or later. */
/* From <machine/signal.h>. */
-int i386fbsd4_sc_pc_offset = 76;
+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)
i386fbsd_init_abi (info, gdbarch);
/* FreeBSD 4.0 introduced a new `struct sigcontext'. */
- tdep->sc_pc_offset = i386fbsd4_sc_pc_offset;
+ tdep->sc_reg_offset = i386fbsd4_sc_reg_offset;
+ tdep->sc_num_regs = I386_NUM_GREGS;
}
\f
gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_aout_flavour,
i386bsd_aout_osabi_sniffer);
- gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_AOUT,
- i386nbsd_init_abi);
- gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_NETBSD_ELF,
- i386nbsdelf_init_abi);
- gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_AOUT,
+ gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_AOUT,
i386fbsdaout_init_abi);
- gdbarch_register_osabi (bfd_arch_i386, GDB_OSABI_FREEBSD_ELF,
+ gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_FREEBSD_ELF,
i386fbsd4_init_abi);
}