GDB 6.1 (excluding .info files)

1 files changed, 277 insertions, 0 deletions

diff --git a/gnu/usr.bin/binutils/gdb/i386obsd-tdep.c b/gnu/usr.bin/binutils/gdb/i386obsd-tdep.c
new file mode 100644
index 00000000000..d8556ea460a
--- /dev/null
+++ b/gnu/usr.bin/binutils/gdb/i386obsd-tdep.c
@@ -0,0 +1,277 @@
+/* Target-dependent code for OpenBSD/i386.
+
+   Copyright 1988, 1989, 1991, 1992, 1994, 1996, 2000, 2001, 2002,
+   2003, 2004
+   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
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   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.  */
+
+#include "defs.h"
+#include "arch-utils.h"
+#include "gdbcore.h"
+#include "regcache.h"
+#include "regset.h"
+#include "osabi.h"
+#include "target.h"
+
+#include "gdb_assert.h"
+#include "gdb_string.h"
+
+#include "i386-tdep.h"
+#include "i387-tdep.h"
+#include "solib-svr4.h"
+
+/* Support for signal handlers.  */
+
+/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
+   in virtual memory.  The randomness makes it somewhat tricky to
+   detect it, but fortunately we can rely on the fact that the start
+   of the sigtramp routine is page-aligned.  By the way, the mapping
+   is read-only, so you cannot place a breakpoint in the signal
+   trampoline.  */
+
+/* Default page size.  */
+static const int i386obsd_page_size = 4096;
+
+/* Return whether PC is in an OpenBSD sigtramp routine.  */
+
+static int
+i386obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
+{
+  CORE_ADDR start_pc = (pc & ~(i386obsd_page_size - 1));
+  const char sigreturn[] =
+  {
+    0xb8,
+    0x67, 0x00, 0x00, 0x00,	/* movl $SYS_sigreturn, %eax */
+    0xcd, 0x80			/* int $0x80 */
+  };
+  char *buf;
+
+  /* Avoid reading memory from the target if possible.  If we're in a
+     named function, we're certainly not in a sigtramp routine
+     provided by the kernel.  Take synthetic function names into
+     account though.  */
+  if (name && name[0] != '<')
+    return 0;
+
+  /* If we can't read the instructions at START_PC, return zero.  */
+  buf = alloca (sizeof sigreturn);
+  if (target_read_memory (start_pc + 0x14, buf, sizeof sigreturn))
+    return 0;
+
+  /* Check for sigreturn(2).  */
+  if (memcmp (buf, sigreturn, sizeof sigreturn) == 0)
+    return 1;
+
+  /* Check for a traditional BSD sigtramp routine.  */
+  return i386bsd_pc_in_sigtramp (pc, name);
+}
+
+/* Return the start address of the sigtramp routine.  */
+
+static CORE_ADDR
+i386obsd_sigtramp_start (CORE_ADDR pc)
+{
+  CORE_ADDR start_pc = (pc & ~(i386obsd_page_size - 1));
+
+  if (i386bsd_pc_in_sigtramp (pc, NULL))
+    return i386bsd_sigtramp_start (pc);
+
+  return start_pc;
+}
+
+/* Return the end address of the sigtramp routine.  */
+
+static CORE_ADDR
+i386obsd_sigtramp_end (CORE_ADDR pc)
+{
+  CORE_ADDR start_pc = (pc & ~(i386obsd_page_size - 1));
+
+  if (i386bsd_pc_in_sigtramp (pc, NULL))
+    return i386bsd_sigtramp_end (pc);
+
+  return start_pc + 0x22;
+}
+
+/* Mapping between the general-purpose registers in `struct reg'
+   format and GDB's register cache layout.  */
+
+/* From <machine/reg.h>.  */
+static int i386obsd_r_reg_offset[] =
+{
+  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 */
+};
+
+static void
+i386obsd_aout_supply_regset (const struct regset *regset,
+			     struct regcache *regcache, int regnum,
+			     const void *regs, size_t len)
+{
+  const struct gdbarch_tdep *tdep = regset->descr;
+
+  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 const struct regset *
+i386obsd_aout_regset_from_core_section (struct gdbarch *gdbarch,
+					const char *sect_name,
+					size_t sect_size)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* OpenBSD a.out core dumps don't use seperate register sets for the
+     general-purpose and floating-point registers.  */
+
+  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 = i386obsd_aout_supply_regset;
+	}
+      return tdep->gregset;
+    }
+
+  return NULL;
+}
+
+
+/* Sigtramp routine location for OpenBSD 3.1 and earlier releases.  */
+CORE_ADDR i386obsd_sigtramp_start_addr = 0xbfbfdf20;
+CORE_ADDR i386obsd_sigtramp_end_addr = 0xbfbfdff0;
+
+/* From <machine/signal.h>.  */
+int i386obsd_sc_reg_offset[I386_NUM_GREGS] =
+{
+  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 
+i386obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* Obviously OpenBSD is BSD-based.  */
+  i386bsd_init_abi (info, gdbarch);
+
+  /* OpenBSD has a different `struct reg'.  */
+  tdep->gregset_reg_offset = i386obsd_r_reg_offset;
+  tdep->gregset_num_regs = ARRAY_SIZE (i386obsd_r_reg_offset);
+  tdep->sizeof_gregset = 16 * 4;
+
+  /* OpenBSD uses -freg-struct-return by default.  */
+  tdep->struct_return = reg_struct_return;
+
+  /* OpenBSD uses a different memory layout.  */
+  tdep->sigtramp_start = i386obsd_sigtramp_start_addr;
+  tdep->sigtramp_end = i386obsd_sigtramp_end_addr;
+  set_gdbarch_pc_in_sigtramp (gdbarch, i386obsd_pc_in_sigtramp);
+  set_gdbarch_sigtramp_start (gdbarch, i386obsd_sigtramp_start);
+  set_gdbarch_sigtramp_end (gdbarch, i386obsd_sigtramp_end);
+
+  /* OpenBSD has a `struct sigcontext' that's different from the
+     origional 4.3 BSD.  */
+  tdep->sc_reg_offset = i386obsd_sc_reg_offset;
+  tdep->sc_num_regs = ARRAY_SIZE (i386obsd_sc_reg_offset);
+}
+
+/* OpenBSD a.out.  */
+
+static void
+i386obsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  i386obsd_init_abi (info, gdbarch);
+
+  /* OpenBSD a.out has a single register set.  */
+  set_gdbarch_regset_from_core_section
+    (gdbarch, i386obsd_aout_regset_from_core_section);
+}
+
+/* OpenBSD ELF.  */
+
+static void
+i386obsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* It's still OpenBSD.  */
+  i386obsd_init_abi (info, gdbarch);
+
+  /* But ELF-based.  */
+  i386_elf_init_abi (info, gdbarch);
+
+  /* OpenBSD 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);
+}
+
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+void _initialize_i386obsd_tdep (void);
+
+void
+_initialize_i386obsd_tdep (void)
+{
+  /* FIXME: kettenis/20021020: Since OpenBSD/i386 binaries are
+     indistingushable from NetBSD/i386 a.out binaries, building a GDB
+     that should support both these targets will probably not work as
+     expected.  */
+#define GDB_OSABI_OPENBSD_AOUT GDB_OSABI_NETBSD_AOUT
+
+  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD_AOUT,
+			  i386obsd_aout_init_abi);
+  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_OPENBSD_ELF,
+			  i386obsd_elf_init_abi);
+}