Initial creation of sourceware repositorygdb-4_18-branchpoint

1 files changed, 163 insertions, 0 deletions

diff --git a/gdb/i386mach-nat.c b/gdb/i386mach-nat.c
new file mode 100644
index 0000000..f843d7f
--- /dev/null
+++ b/gdb/i386mach-nat.c
@@ -0,0 +1,163 @@
+/* Native dependent code for Mach 386's for GDB, the GNU debugger.
+   Copyright (C) 1986, 1987, 1989, 1991, 1992 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 "frame.h"
+#include "inferior.h"
+#include "gdbcore.h"
+
+#include <sys/param.h>
+#include <sys/dir.h>
+#include <sys/user.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+
+#include <sys/ptrace.h>
+#include <machine/reg.h>
+
+#include <sys/file.h>
+#include "gdb_stat.h"
+#include <sys/core.h>
+
+static void fetch_core_registers PARAMS ((char *, unsigned, int, CORE_ADDR));
+
+void
+fetch_inferior_registers (regno)
+     int regno;		/* Original value discarded */
+{
+  struct regs inferior_registers;
+  struct fp_state inferior_fp_registers;
+  extern char registers[];
+
+  registers_fetched ();
+
+  ptrace (PTRACE_GETREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_registers);
+  ptrace (PTRACE_GETFPREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_fp_registers);
+
+  memcpy (registers, &inferior_registers, sizeof inferior_registers);
+
+  memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
+	 inferior_fp_registers.f_st,
+	 sizeof inferior_fp_registers.f_st);
+  memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
+	 &inferior_fp_registers.f_ctrl,
+	 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
+}
+
+/* Store our register values back into the inferior.
+   If REGNO is -1, do this for all registers.
+   Otherwise, REGNO specifies which register (so we can save time).  */
+
+void
+store_inferior_registers (regno)
+     int regno;
+{
+  struct regs inferior_registers;
+  struct fp_state inferior_fp_registers;
+  extern char registers[];
+
+  memcpy (&inferior_registers, registers, 20 * 4);
+
+  memcpy (inferior_fp_registers.f_st,&registers[REGISTER_BYTE (FP0_REGNUM)],
+	 sizeof inferior_fp_registers.f_st);
+  memcpy (&inferior_fp_registers.f_ctrl,
+	 &registers[REGISTER_BYTE (FPC_REGNUM)],
+	 sizeof inferior_fp_registers - sizeof inferior_fp_registers.f_st);
+  
+#ifdef PTRACE_FP_BUG
+  if (regno == FP_REGNUM || regno == -1)
+    /* Storing the frame pointer requires a gross hack, in which an
+       instruction that moves eax into ebp gets single-stepped.  */
+    {
+      int stack = inferior_registers.r_reg[SP_REGNUM];
+      int stuff = ptrace (PTRACE_PEEKDATA, inferior_pid,
+			  (PTRACE_ARG3_TYPE) stack);
+      int reg = inferior_registers.r_reg[EAX];
+      inferior_registers.r_reg[EAX] =
+	inferior_registers.r_reg[FP_REGNUM];
+      ptrace (PTRACE_SETREGS, inferior_pid,
+	      (PTRACE_ARG3_TYPE) &inferior_registers);
+      ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0xc589);
+      ptrace (PTRACE_SINGLESTEP, inferior_pid, (PTRACE_ARG3_TYPE) stack, 0);
+      wait (0);
+      ptrace (PTRACE_POKEDATA, inferior_pid, (PTRACE_ARG3_TYPE) stack, stuff);
+      inferior_registers.r_reg[EAX] = reg;
+    }
+#endif
+  ptrace (PTRACE_SETREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_registers);
+  ptrace (PTRACE_SETFPREGS, inferior_pid,
+	  (PTRACE_ARG3_TYPE) &inferior_fp_registers);
+}
+
+
+
+/* Work with core files, for GDB. */
+
+static void
+fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr)
+     char *core_reg_sect;
+     unsigned core_reg_size;
+     int which;
+     CORE_ADDR reg_addr;	/* Unused in this version */
+{
+  int val;
+  extern char registers[];
+
+  switch (which) {
+  case 0:
+  case 1:
+    memcpy (registers, core_reg_sect, core_reg_size);
+    break;
+
+  case 2:
+#ifdef FP0_REGNUM
+    memcpy (&registers[REGISTER_BYTE (FP0_REGNUM)],
+	   core_reg_sect,
+	   core_reg_size);		/* FIXME, probably bogus */
+#endif
+#ifdef FPC_REGNUM
+    memcpy (&registers[REGISTER_BYTE (FPC_REGNUM)],
+	   &corestr.c_fpu.f_fpstatus.f_ctrl,
+	   sizeof corestr.c_fpu.f_fpstatus -
+	   sizeof corestr.c_fpu.f_fpstatus.f_st);
+#endif
+    break;
+  }
+}
+
+
+/* Register that we are able to handle i386mach core file formats.
+   FIXME: is this really bfd_target_unknown_flavour? */
+
+static struct core_fns i386mach_core_fns =
+{
+  bfd_target_unknown_flavour,
+  fetch_core_registers,
+  NULL
+};
+
+void
+_initialize_core_i386mach ()
+{
+  add_core_fns (&i386mach_core_fns);
+}