proc-service, extern "C"

[deliverable/binutils-gdb.git] / gdb / amd64fbsd-tdep.c

diff --git a/gdb/amd64fbsd-tdep.c b/gdb/amd64fbsd-tdep.c
index 1aae6ab5531910c1bbde704b5df5bbe910ecf6b7..e11b0f371ecab9b3ea32262b3c07a14aafd8ab4c 100644 (file)
--- a/gdb/amd64fbsd-tdep.c
+++ b/gdb/amd64fbsd-tdep.c
@@ -1,7 +1,6 @@
 /* Target-dependent code for FreeBSD/amd64.
 
-   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011
-   Free Software Foundation, Inc.
+   Copyright (C) 2003-2015 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -25,27 +24,56 @@
 #include "regcache.h"
 #include "osabi.h"
 
-#include "gdb_assert.h"
-#include "gdb_string.h"
-
 #include "amd64-tdep.h"
 #include "bsd-uthread.h"
+#include "fbsd-tdep.h"
 #include "solib-svr4.h"
 
 /* Support for signal handlers.  */
 
+/* Return whether THIS_FRAME corresponds to a FreeBSD sigtramp
+   routine.  */
+
+static const gdb_byte amd64fbsd_sigtramp_code[] =
+{
+  0x48, 0x8d, 0x7c, 0x24, 0x10, /* lea     SIGF_UC(%rsp),%rdi */
+  0x6a, 0x00,                  /* pushq   $0 */
+  0x48, 0xc7, 0xc0, 0xa1, 0x01, 0x00, 0x00,
+                               /* movq    $SYS_sigreturn,%rax */
+  0x0f, 0x05                    /* syscall */
+};
+
+static int
+amd64fbsd_sigtramp_p (struct frame_info *this_frame)
+{
+  CORE_ADDR pc = get_frame_pc (this_frame);
+  gdb_byte buf[sizeof amd64fbsd_sigtramp_code];
+
+  if (!safe_frame_unwind_memory (this_frame, pc, buf, sizeof buf))
+    return 0;
+  if (memcmp (buf, amd64fbsd_sigtramp_code, sizeof amd64fbsd_sigtramp_code) !=
+      0)
+    return 0;
+
+  return 1;
+}
+
 /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
    address of the associated sigcontext structure.  */
 
 static CORE_ADDR
 amd64fbsd_sigcontext_addr (struct frame_info *this_frame)
 {
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   CORE_ADDR sp;
+  gdb_byte buf[8];
 
   /* The `struct sigcontext' (which really is an `ucontext_t' on
      FreeBSD/amd64) lives at a fixed offset in the signal frame.  See
      <machine/sigframe.h>.  */
-  sp = frame_unwind_register_unsigned (this_frame, AMD64_RSP_REGNUM);
+  get_frame_register (this_frame, AMD64_RSP_REGNUM, buf);
+  sp = extract_unsigned_integer (buf, 8, byte_order);
   return sp + 16;
 }
 \f
@@ -87,8 +115,8 @@ static int amd64fbsd_r_reg_offset[] =
 };
 
 /* Location of the signal trampoline.  */
-CORE_ADDR amd64fbsd_sigtramp_start_addr = 0x7fffffffffc0ULL;
-CORE_ADDR amd64fbsd_sigtramp_end_addr = 0x7fffffffffe0ULL;
+CORE_ADDR amd64fbsd_sigtramp_start_addr;
+CORE_ADDR amd64fbsd_sigtramp_end_addr;
 
 /* From <machine/signal.h>.  */
 int amd64fbsd_sc_reg_offset[] =
@@ -186,6 +214,9 @@ amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 
+  /* Generic FreeBSD support. */
+  fbsd_init_abi (info, gdbarch);
+
   /* Obviously FreeBSD is BSD-based.  */
   i386bsd_init_abi (info, gdbarch);
 
@@ -195,6 +226,7 @@ amd64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 
   amd64_init_abi (info, gdbarch);
 
+  tdep->sigtramp_p = amd64fbsd_sigtramp_p;
   tdep->sigtramp_start = amd64fbsd_sigtramp_start_addr;
   tdep->sigtramp_end = amd64fbsd_sigtramp_end_addr;
   tdep->sigcontext_addr = amd64fbsd_sigcontext_addr;