*** empty log message ***

[deliverable/binutils-gdb.git] / gdb / i386bsd-nat.c

diff --git a/gdb/i386bsd-nat.c b/gdb/i386bsd-nat.c
index f1182ea4e800b85bac2781e3b9c09a4eb83675dd..9827afcaebd5e0516b5559e6b6bb3118fb563041 100644 (file)
--- a/gdb/i386bsd-nat.c
+++ b/gdb/i386bsd-nat.c
@@ -1,5 +1,5 @@
 /* Native-dependent code for modern i386 BSD's.
-   Copyright (C) 2000 Free Software Foundation, Inc.
+   Copyright 2000, 2001 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -20,7 +20,11 @@
 
 #include "defs.h"
 #include "inferior.h"
+#include "regcache.h"
 
+#include "gdb_assert.h"
+#include <signal.h>
+#include <stddef.h>
 #include <sys/types.h>
 #include <sys/ptrace.h>
 #include <machine/reg.h>
@@ -103,7 +107,7 @@ cannot_fetch_register (int regno)
 
 /* Transfering the registers between GDB, inferiors and core files.  */
 
-/* Fill GDB's register array with the genereal-purpose register values
+/* Fill GDB's register array with the general-purpose register values
    in *GREGSETP.  */
 
 void
@@ -164,7 +168,8 @@ fetch_inferior_registers (int regno)
 {
   gregset_t gregs;
 
-  if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
+  if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
+              (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
     perror_with_name ("Couldn't get registers");
 
   supply_gregset (&gregs);
@@ -173,7 +178,7 @@ fetch_inferior_registers (int regno)
     {
       fpregset_t fpregs;
 
-      if (ptrace (PT_GETFPREGS, inferior_pid,
+      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
                  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
        perror_with_name ("Couldn't get floating point status");
 
@@ -189,31 +194,110 @@ store_inferior_registers (int regno)
 {
   gregset_t gregs;
 
-  if (ptrace (PT_GETREGS, inferior_pid, (PTRACE_ARG3_TYPE) &gregs, 0) == -1)
+  if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
+              (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)
+  if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
+             (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,
+      if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
                  (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,
+      if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
                  (PTRACE_ARG3_TYPE) &fpregs, 0) == -1)
        perror_with_name ("Couldn't write floating point status");
     }
 }
 \f
 
+/* Support for debug registers.  */
+
+#ifdef HAVE_PT_GETDBREGS
+
+/* Not all versions of FreeBSD/i386 that support the debug registers
+   have this macro.  */
+#ifndef DBREG_DRX
+#define DBREG_DRX(d, x) ((&d->dr0)[x])
+#endif
+
+static void
+i386bsd_dr_set (int regnum, unsigned int value)
+{
+  struct dbreg dbregs;
+
+  if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
+              (PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
+    perror_with_name ("Couldn't get debug registers");
+
+  /* For some mysterious reason, some of the reserved bits in the
+     debug control register get set.  Mask these off, otherwise the
+     ptrace call below will fail.  */
+  dbregs.dr7 &= ~(0x0000fc00);
+
+  DBREG_DRX ((&dbregs), regnum) = value;
+
+  if (ptrace (PT_SETDBREGS, PIDGET (inferior_ptid),
+              (PTRACE_ARG3_TYPE) &dbregs, 0) == -1)
+    perror_with_name ("Couldn't write debug registers");
+}
+
+void
+i386bsd_dr_set_control (unsigned long control)
+{
+  i386bsd_dr_set (7, control);
+}
+
+void
+i386bsd_dr_set_addr (int regnum, CORE_ADDR addr)
+{
+  gdb_assert (regnum >= 0 && regnum <= 4);
+
+  i386bsd_dr_set (regnum, addr);
+}
+
+void
+i386bsd_dr_reset_addr (int regnum)
+{
+  gdb_assert (regnum >= 0 && regnum <= 4);
+
+  i386bsd_dr_set (regnum, 0);
+}
+
+unsigned long
+i386bsd_dr_get_status (void)
+{
+  struct dbreg dbregs;
+
+  /* FIXME: kettenis/2001-03-31: Calling perror_with_name if the
+     ptrace call fails breaks debugging remote targets.  The correct
+     way to fix this is to add the hardware breakpoint and watchpoint
+     stuff to the target vector.  For now, just return zero if the
+     ptrace call fails.  */
+  if (ptrace (PT_GETDBREGS, PIDGET (inferior_ptid),
+             (PTRACE_ARG3_TYPE) & dbregs, 0) == -1)
+#if 0
+    perror_with_name ("Couldn't read debug registers");
+#else
+    return 0;
+#endif
+
+  return dbregs.dr6;
+}
+
+#endif /* PT_GETDBREGS */
+\f
+
 /* Support for the user struct.  */
 
 /* Return the address register REGNO.  BLOCKEND is the value of
@@ -235,3 +319,20 @@ kernel_u_size (void)
 {
   return (sizeof (struct user));
 }
+\f
+/* See i386bsd-tdep.c.  */
+extern int i386bsd_sigcontext_pc_offset;
+
+void
+_initialize_i386bsd_nat (void)
+{
+  /* To support the recognition of signal handlers, i386bsd-tdep.c
+     hardcodes some constants.  Inclusion of this file means that we
+     are compiling a native debugger, which means that we can use the
+     system header files and sysctl(3) to get at the relevant
+     information.  */
+
+  /* Override the default value for the offset of the program counter
+     in the sigcontext structure.  */
+  i386bsd_sigcontext_pc_offset = offsetof (struct sigcontext, sc_pc);
+}