Add support for FreeBSD/i386 ELF.

* i386bsd-nat.c: New file.
* config/i386/tm-fbsd.h (HAVE_I387_REGS): Define.
Include "i386/tm-i386.h" instead of "i386/tm-i386b.h".
(NUM_REGS): Remove redefinition.
(USE_STRUCT_CONVENTION): Define.
(i386_float_info): Remove prototype.
(FLOAT_INFO): Remove define.
(JB_ELEMENT_SIZE): Define to 4.
(JB_PC): Define to 0.
(GET_LONGJMP_TARGET): Define.
(SIGTRAMP_START, SIGTRAMP_END): Define.
(SIGCONTEXT_PC_OFFSET): Define.
(IN_SOLIB_CALL_TRAMPOLINE): Only define if !SVR4_SHARED_LIBS
* config/i386/nm-fbsd.h (PTRACE_ARG3_TYPE): Define to caddr_t.
(FETCH_INFERIOR_REGISTERS): Define.
(ATTACH_DETACH): Define.
(kernel_u_size): Remove PARAMS.
(register_u_addr): Use CORE_ADDR in prototype where appropriate.
Remove PARAMS.
(SVR4_SHARED_LIBS) [FREEBSD_ELF || __ELF__ && !FREEBSD_AOUT]:
Define.
[SVR4_SHARED_LIBS]: Include "elf/common.h".
Only define aliases for struct members from <link.h> if
!SVR4_SHARED_LIBS.
* config/i386/xm-fbsd.h: New file.
* config/i386/fbsd.mt (TDEPFILES): Remove solib.o.
* config/i386/fbsd.mh (NATDEPFILES): Remove i386b-nat.o.  Add
core-regset.o i387-nat.o i386bsd-nat.o.

1 files changed, 238 insertions, 0 deletions

diff --git a/gdb/i386bsd-nat.c b/gdb/i386bsd-nat.c
new file mode 100644
index 00000000000..c4def7e568f
--- /dev/null
+++ b/gdb/i386bsd-nat.c
@@ -0,0 +1,238 @@
+/* Native-dependent code for modern i386 BSD's.
+   Copyright (C) 2000 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 "inferior.h"
+
+#include <sys/types.h>
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+#include <machine/frame.h>
+
+#ifdef HAVE_SYS_PROCFS_H
+#include <sys/procfs.h>
+#endif
+
+#ifndef HAVE_GREGSET_T
+typedef struct reg gregset_t;
+#endif
+
+#ifndef HAVE_FPREGSET_T
+typedef struct fpreg fpregset_t;
+#endif
+
+/* In older BSD versions we cannot get at some of the segment
+   registers.  FreeBSD for example didn't support the %fs and %gs
+   registers until the 3.0 release.  We have autoconf checks for their
+   presence, and deal gracefully with their absence.  */
+
+/* Registers we shouldn't try to fetch.  */
+#if !defined (CANNOT_FETCH_REGISTER)
+#define CANNOT_FETCH_REGISTER(regno) cannot_fetch_register (regno)
+#endif
+
+/* Registers we shouldn't try to store.  */
+#if !defined (CANNOT_STORE_REGISTER)
+#define CANNOT_STORE_REGISTER(regno) CANNOT_FETCH_REGISTER (regno)
+#endif
+
+/* Offset to the gregset_t location where REG is stored.  */
+#define REG_OFFSET(reg) offsetof (gregset_t, reg)
+
+/* At reg_offset[REGNO] you'll find the offset to the gregset_t
+   location where the GDB register REGNO is stored.  Unsupported
+   registers are marked with `-1'.  */
+static int reg_offset[] =
+{
+  REG_OFFSET (r_eax),
+  REG_OFFSET (r_ecx),
+  REG_OFFSET (r_edx),
+  REG_OFFSET (r_edx),
+  REG_OFFSET (r_esp),
+  REG_OFFSET (r_ebp),
+  REG_OFFSET (r_esi),
+  REG_OFFSET (r_edi),
+  REG_OFFSET (r_eip),
+  REG_OFFSET (r_eflags),
+  REG_OFFSET (r_cs),
+  REG_OFFSET (r_ss),
+  REG_OFFSET (r_ds),
+  REG_OFFSET (r_es),
+#ifdef HAVE_R_FS
+  REG_OFFSET (r_fs),
+#else
+  -1,
+#endif
+#ifdef HAVE_R_GS
+  REG_OFFSET (r_gs)
+#else
+  -1
+#endif
+};
+
+#define REG_ADDR(regset, regno) ((char *) (regset) + reg_offset[regno])
+
+/* Return nonzero if we shouldn't try to fetch register REGNO.  */
+
+static int
+cannot_fetch_register (int regno)
+{
+  return (reg_offset[regno] == -1);
+}
+
+
+/* Transfering the registers between GDB, inferiors and core files.  */
+
+/* Fill GDB's register array with the genereal-purpose register values
+   in *GREGSETP.  */
+
+void
+supply_gregset (gregset_t *gregsetp)
+{
+  char buf[MAX_REGISTER_RAW_SIZE];
+  int i;
+
+  for (i = 0; i < NUM_GREGS; i++)
+    {
+      if (CANNOT_FETCH_REGISTER (i))
+	{
+	  memset (buf, 0, REGISTER_RAW_SIZE (i));
+	  supply_register (i, buf);
+	}
+      else
+	supply_register (i, REG_ADDR (gregsetp, i));
+    }
+}
+
+/* Fill register REGNO (if it is a general-purpose register) in
+   *GREGSETPS with the value in GDB's register array.  If REGNO is -1,
+   do this for all registers.  */
+
+void
+fill_gregset (gregset_t *gregsetp, int regno)
+{
+  int i;
+
+  for (i = 0; i < NUM_GREGS; i++)
+    if ((regno == -1 || regno == i) && ! CANNOT_STORE_REGISTER (i))
+      memcpy (REG_ADDR (gregsetp, i), &registers[REGISTER_BYTE (regno)],
+	      REGISTER_RAW_SIZE (i));
+}
+
+#include "i387-nat.h"
+
+/* Fill GDB's register array with the floating-point register values
+   in *FPREGSETP.  */
+
+void
+supply_fpregset (fpregset_t *fpregsetp)
+{
+  i387_supply_fsave ((char *) fpregsetp);
+}
+
+/* Fill register REGNO (if it is a floating-point register) in
+   *FPREGSETP with the value in GDB's register array.  If REGNO is -1,
+   do this for all registers.  */
+
+void
+fill_fpregset (fpregset_t *fpregsetp, int regno)
+{
+  i387_fill_fsave ((char *) fpregsetp, regno);
+}
+
+/* Fetch register REGNO from the inferior.  If REGNO is -1, do this
+   for all registers (including the floating point registers).  */
+
+void
+fetch_inferior_registers (int regno)
+{
+  gregset_t gregs;
+
+  if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
+    perror_with_name ("Couldn't get registers");
+
+  supply_gregset (&gregs);
+
+  if (regno == -1 || regno >= FP0_REGNUM)
+    {
+      fpregset_t fpregs;
+
+      if (ptrace (PT_GETFPREGS, inferior_pid,
+		  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
+	perror_with_name ("Couldn't get floating point status");
+
+      supply_fpregset (&fpregs);
+    }
+}  
+
+/* Store register REGNO back into the inferior.  If REGNO is -1, do
+   this for all registers (including the floating point registers).  */
+
+void
+store_inferior_registers (int regno)
+{
+  gregset_t gregs;
+
+  if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
+    perror_with_name ("Couldn't get registers");
+
+  fill_gregset (&gregs, regno);
+
+  if (ptrace (PT_SETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
+    perror_with_name ("Couldn't write registers");
+
+  if (regno == -1 || regno >= FP0_REGNUM)
+    {
+      fpregset_t fpregs;
+
+      if (ptrace (PT_GETFPREGS, inferior_pid,
+		  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
+	perror_with_name ("Couldn't get floating point status");
+
+      fill_fpregset (&fpregs, regno);
+  
+      if (ptrace (PT_SETFPREGS, inferior_pid,
+		  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
+	perror_with_name ("Couldn't write floating point status");
+    }
+}
+
+
+/* Support for the user struct.  */
+
+/* Return the address register REGNO.  BLOCKEND is the value of
+   u.u_ar0, which should point to the registers.  */
+
+CORE_ADDR
+register_u_addr (CORE_ADDR blockend, int regno)
+{
+  return (CORE_ADDR) REG_ADDR (blockend, regno);
+}
+
+#include <sys/param.h>
+#include <sys/user.h>
+
+/* Return the size of the user struct.  */
+
+int
+kernel_u_size (void)
+{
+  return (sizeof (struct user));
+}