<sys/sysctl.h>.
(store_inferior_registers): Wrap long line.
(i386bsd_dr_get_status): Fix typo in comment.
(_initialize_i386bsd_nat): New function. * i386bsd-tdep.c: New
file. * config/i386/tm-fbsd.h (IN_SIGTRAMP): New define.
(i386bsd_in_sigtramp): New prototype.
(SIGTRAMP_START, SIGTRAMP_END): Redefine in terms...
(i386bsd_sigtramp_start, i386bsd_sigtramp_end): ...these new
(external) variables.
(SIGCONTEXT_PC_OFFSET): Removed.
(FRAME_SAVED_PC): New define.
(i386bsd_frame_saved_pc): New function. * config/i386/fbsd.mt
(TDEPFILES): Add i386bsd-tdep.o.
+2001-07-13 Mark Kettenis <kettenis@gnu.org>
+
+ * i386bsd-nat.c: Include <signal.h>, <stddef.h> and
+ <sys/sysctl.h>.
+ (store_inferior_registers): Wrap long line.
+ (i386bsd_dr_get_status): Fix typo in comment.
+ (_initialize_i386bsd_nat): New function. * i386bsd-tdep.c: New
+ file. * config/i386/tm-fbsd.h (IN_SIGTRAMP): New define.
+ (i386bsd_in_sigtramp): New prototype.
+ (SIGTRAMP_START, SIGTRAMP_END): Redefine in terms...
+ (i386bsd_sigtramp_start, i386bsd_sigtramp_end): ...these new
+ (external) variables.
+ (SIGCONTEXT_PC_OFFSET): Removed.
+ (FRAME_SAVED_PC): New define.
+ (i386bsd_frame_saved_pc): New function. * config/i386/fbsd.mt
+ (TDEPFILES): Add i386bsd-tdep.o.
+
2001-07-12 Daniel Jacobowitz <drow@mvista.com>
* mips-linux-tdep.c (_initialize_mips_linux_tdep): Use ISO C
# Target: Intel 386 running FreeBSD
-TDEPFILES= i386-tdep.o i387-tdep.o
+TDEPFILES= i386-tdep.o i387-tdep.o i386bsd-tdep.o
TM_FILE= tm-fbsd.h
/* Target-dependent definitions for FreeBSD/i386.
- Copyright 1997, 1999, 2000 Free Software Foundation, Inc.
+ Copyright 1997, 1999, 2000, 2001 Free Software Foundation, Inc.
This file is part of GDB.
/* Figure out where the longjmp will land. Store the address that
longjmp will jump to in *ADDR, and return non-zero if successful. */
-extern int get_longjmp_target (CORE_ADDR *addr);
#define GET_LONGJMP_TARGET(addr) get_longjmp_target (addr)
+extern int get_longjmp_target (CORE_ADDR *addr);
\f
/* Support for signal handlers. */
-/* The sigtramp is above the user stack and immediately below
- the user area. Using constants here allows for cross debugging.
- These are tested for FreeBSD 3.4. */
+#define IN_SIGTRAMP(pc, name) i386bsd_in_sigtramp (pc, name)
+extern int i386bsd_in_sigtramp (CORE_ADDR pc, char *name);
+
+/* These defines allow the recognition of sigtramps as a function name
+ <sigtramp>.
+
+ FIXME: kettenis/2001-07-13: These should be added to the target
+ vector and turned into functions when we go "multi-arch". */
+
+#define SIGTRAMP_START(pc) i386bsd_sigtramp_start
+#define SIGTRAMP_END(pc) i386bsd_sigtramp_end
+extern CORE_ADDR i386bsd_sigtramp_start;
+extern CORE_ADDR i386bsd_sigtramp_end;
-#define SIGTRAMP_START(pc) 0xbfbfdf20
-#define SIGTRAMP_END(pc) 0xbfbfdff0
+/* Override FRAME_SAVED_PC to enable the recognition of signal handlers. */
-/* Offset to saved PC in sigcontext, from <sys/signal.h>. */
-#define SIGCONTEXT_PC_OFFSET 20
+#undef FRAME_SAVED_PC
+#define FRAME_SAVED_PC(frame) i386bsd_frame_saved_pc (frame)
+extern CORE_ADDR i386bsd_frame_saved_pc (struct frame_info *frame);
\f
/* Shared library support. */
#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>
fill_gregset (&gregs, regno);
- if (ptrace (PT_SETREGS, PIDGET (inferior_ptid), (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)
/* 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 vectore. For now, just return zero if the
+ 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)
{
return (sizeof (struct user));
}
+\f
+/* See i386bsd-tdep.c. */
+extern int i386bsd_sigcontext_pc_offset;
+
+#include <sys/sysctl.h>
+
+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);
+
+ /* FreeBSD provides a kern.ps_strings sysctl that we can use to
+ locate the sigtramp. That way we can still recognize a sigtramp
+ if it's location is changed in a new kernel. Of course this is
+ still based on the assumption that the sigtramp is placed
+ directly under the location where the program arguments and
+ environment can be found. */
+#ifdef KERN_PS_STRINGS
+ {
+ int mib[2];
+ int ps_strings;
+ size_t len;
+
+ mib[0] = CTL_KERN;
+ mib[1] = KERN_PS_STRINGS;
+ len = sizeof (ps_strings);
+ if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0)
+ {
+ i386bsd_sigtramp_start = ps_strings - 128;
+ i386bsd_sigtramp_end = ps_strings;
+ }
+ }
+#endif
+}
--- /dev/null
+/* Target-dependent code for i386 BSD's.
+ Copyright 2001 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 "gdbcore.h"
+#include "regcache.h"
+
+/* Support for signal handlers. */
+
+/* Range in which to find the signaltramp routine, traditionally found
+ on the use stack, just below the user area. Initialized to values
+ that work for NetBSD and FreeBSD. */
+
+CORE_ADDR i386bsd_sigtramp_start = 0xbfbfdf20;
+CORE_ADDR i386bsd_sigtramp_end = 0xbfbfdff0;
+
+/* Return whether PC is in a BSD sigtramp routine. */
+
+int
+i386bsd_in_sigtramp (CORE_ADDR pc, char *name)
+{
+ return (pc >= i386bsd_sigtramp_start && pc < i386bsd_sigtramp_end);
+}
+
+/* Offset in the sigcontext structure of the program counter.
+ Initialized to the value from 4.4 BSD Lite. */
+int i386bsd_sigcontext_pc_offset = 20;
+
+/* Assuming FRAME is for a BSD sigtramp routine, return the address of
+ the associated sigcontext structure. */
+
+static CORE_ADDR
+i386bsd_sigcontext_addr (struct frame_info *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. */
+
+static CORE_ADDR
+i386bsd_sigtramp_saved_pc (struct frame_info *frame)
+{
+ CORE_ADDR addr;
+ addr = i386bsd_sigcontext_addr (frame);
+ return read_memory_unsigned_integer (addr + i386bsd_sigcontext_pc_offset, 4);
+}
+
+/* Return the saved program counter for FRAME. */
+
+CORE_ADDR
+i386bsd_frame_saved_pc (struct frame_info *frame)
+{
+ if (frame->signal_handler_caller)
+ return i386bsd_sigtramp_saved_pc (frame);
+
+ return read_memory_unsigned_integer (frame->frame + 4, 4);
+}
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