X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Famd64obsd-tdep.c;h=ed57cb8c4758b34153f6266535cdeba534454ec5;hb=4ee62156d969867d3d3ffedf656a74643f77279e;hp=34a48ca8eaa03fc793f2ebba34831b92964201a7;hpb=197e01b6dcd118b70ed3621b62b2ff3fa929d50f;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/amd64obsd-tdep.c b/gdb/amd64obsd-tdep.c
index 34a48ca8ea..ed57cb8c47 100644
--- a/gdb/amd64obsd-tdep.c
+++ b/gdb/amd64obsd-tdep.c
@@ -1,12 +1,13 @@
 /* Target-dependent code for OpenBSD/amd64.
 
-   Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009
+   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
+   the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
@@ -15,12 +16,11 @@
    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., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "defs.h"
 #include "frame.h"
+#include "frame-unwind.h"
 #include "gdbcore.h"
 #include "symtab.h"
 #include "objfiles.h"
@@ -28,6 +28,7 @@
 #include "regcache.h"
 #include "regset.h"
 #include "target.h"
+#include "trad-frame.h"
 
 #include "gdb_assert.h"
 #include "gdb_string.h"
@@ -79,13 +80,13 @@ amd64obsd_regset_from_core_section (struct gdbarch *gdbarch,
 /* Default page size.  */
 static const int amd64obsd_page_size = 4096;
 
-/* Return whether the frame preceding NEXT_FRAME corresponds to an
-   OpenBSD sigtramp routine.  */
+/* Return whether THIS_FRAME corresponds to an OpenBSD sigtramp
+   routine.  */
 
 static int
-amd64obsd_sigtramp_p (struct frame_info *next_frame)
+amd64obsd_sigtramp_p (struct frame_info *this_frame)
 {
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR pc = get_frame_pc (this_frame);
   CORE_ADDR start_pc = (pc & ~(amd64obsd_page_size - 1));
   const gdb_byte sigreturn[] =
   {
@@ -110,7 +111,7 @@ amd64obsd_sigtramp_p (struct frame_info *next_frame)
 
   /* If we can't read the instructions at START_PC, return zero.  */
   buf = alloca ((sizeof sigreturn) + 1);
-  if (!safe_frame_unwind_memory (next_frame, start_pc + 6, buf, buflen))
+  if (!safe_frame_unwind_memory (this_frame, start_pc + 6, buf, buflen))
     return 0;
 
   /* Check for sigreturn(2).  Depending on how the assembler encoded
@@ -123,13 +124,13 @@ amd64obsd_sigtramp_p (struct frame_info *next_frame)
   return 1;
 }
 
-/* Assuming NEXT_FRAME is for a frame following a BSD sigtramp
-   routine, return the address of the associated sigcontext structure.  */
+/* Assuming THIS_FRAME is for a BSD sigtramp routine, return the
+   address of the associated sigcontext structure.  */
 
 static CORE_ADDR
-amd64obsd_sigcontext_addr (struct frame_info *next_frame)
+amd64obsd_sigcontext_addr (struct frame_info *this_frame)
 {
-  CORE_ADDR pc = frame_pc_unwind (next_frame);
+  CORE_ADDR pc = get_frame_pc (this_frame);
   ULONGEST offset = (pc & (amd64obsd_page_size - 1));
 
   /* The %rsp register points at `struct sigcontext' upon entry of a
@@ -145,9 +146,9 @@ amd64obsd_sigcontext_addr (struct frame_info *next_frame)
      instruction clobbers %rsp, but its value is saved in `%rdi'.  */
 
   if (offset > 5)
-    return frame_unwind_register_unsigned (next_frame, AMD64_RDI_REGNUM);
+    return get_frame_register_unsigned (this_frame, AMD64_RDI_REGNUM);
   else
-    return frame_unwind_register_unsigned (next_frame, AMD64_RSP_REGNUM);
+    return get_frame_register_unsigned (this_frame, AMD64_RSP_REGNUM);
 }
 
 /* OpenBSD 3.5 or later.  */
@@ -250,6 +251,8 @@ static void
 amd64obsd_supply_uthread (struct regcache *regcache,
 			  int regnum, CORE_ADDR addr)
 {
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   CORE_ADDR sp_addr = addr + AMD64OBSD_UTHREAD_RSP_OFFSET;
   CORE_ADDR sp = 0;
   gdb_byte buf[8];
@@ -262,12 +265,12 @@ amd64obsd_supply_uthread (struct regcache *regcache,
       int offset;
 
       /* Fetch stack pointer from thread structure.  */
-      sp = read_memory_unsigned_integer (sp_addr, 8);
+      sp = read_memory_unsigned_integer (sp_addr, 8, byte_order);
 
       /* Adjust the stack pointer such that it looks as if we just
          returned from _thread_machdep_switch.  */
       offset = amd64obsd_uthread_reg_offset[AMD64_RIP_REGNUM] + 8;
-      store_unsigned_integer (buf, 8, sp + offset);
+      store_unsigned_integer (buf, 8, byte_order, sp + offset);
       regcache_raw_supply (regcache, AMD64_RSP_REGNUM, buf);
     }
 
@@ -279,7 +282,7 @@ amd64obsd_supply_uthread (struct regcache *regcache,
 	  /* Fetch stack pointer from thread structure (if we didn't
              do so already).  */
 	  if (sp == 0)
-	    sp = read_memory_unsigned_integer (sp_addr, 8);
+	    sp = read_memory_unsigned_integer (sp_addr, 8, byte_order);
 
 	  /* Read the saved register from the stack frame.  */
 	  read_memory (sp + amd64obsd_uthread_reg_offset[i], buf, 8);
@@ -292,6 +295,8 @@ static void
 amd64obsd_collect_uthread (const struct regcache *regcache,
 			   int regnum, CORE_ADDR addr)
 {
+  struct gdbarch *gdbarch = get_regcache_arch (regcache);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   CORE_ADDR sp_addr = addr + AMD64OBSD_UTHREAD_RSP_OFFSET;
   CORE_ADDR sp = 0;
   gdb_byte buf[8];
@@ -307,10 +312,10 @@ amd64obsd_collect_uthread (const struct regcache *regcache,
          stored into the thread structure.  */
       offset = amd64obsd_uthread_reg_offset[AMD64_RIP_REGNUM] + 8;
       regcache_raw_collect (regcache, AMD64_RSP_REGNUM, buf);
-      sp = extract_unsigned_integer (buf, 8) - offset;
+      sp = extract_unsigned_integer (buf, 8, byte_order) - offset;
 
       /* Store the stack pointer.  */
-      write_memory_unsigned_integer (sp_addr, 8, sp);
+      write_memory_unsigned_integer (sp_addr, 8, byte_order, sp);
 
       /* The stack pointer was (potentially) modified.  Make sure we
          build a proper stack frame.  */
@@ -325,7 +330,7 @@ amd64obsd_collect_uthread (const struct regcache *regcache,
 	  /* Fetch stack pointer from thread structure (if we didn't
              calculate it already).  */
 	  if (sp == 0)
-	    sp = read_memory_unsigned_integer (sp_addr, 8);
+	    sp = read_memory_unsigned_integer (sp_addr, 8, byte_order);
 
 	  /* Write the register into the stack frame.  */
 	  regcache_raw_collect (regcache, i, buf);
@@ -333,6 +338,111 @@ amd64obsd_collect_uthread (const struct regcache *regcache,
 	}
     }
 }
+/* Kernel debugging support.  */
+
+/* From <machine/frame.h>.  Easy since `struct trapframe' matches
+   `struct sigcontext'.  */
+#define amd64obsd_tf_reg_offset amd64obsd_sc_reg_offset
+
+static struct trad_frame_cache *
+amd64obsd_trapframe_cache (struct frame_info *this_frame, void **this_cache)
+{
+  struct gdbarch *gdbarch = get_frame_arch (this_frame);
+  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
+  struct trad_frame_cache *cache;
+  CORE_ADDR func, sp, addr;
+  ULONGEST cs;
+  char *name;
+  int i;
+
+  if (*this_cache)
+    return *this_cache;
+
+  cache = trad_frame_cache_zalloc (this_frame);
+  *this_cache = cache;
+
+  func = get_frame_func (this_frame);
+  sp = get_frame_register_unsigned (this_frame, AMD64_RSP_REGNUM);
+
+  find_pc_partial_function (func, &name, NULL, NULL);
+  if (name && strncmp (name, "Xintr", 5) == 0)
+    addr = sp + 8;		/* It's an interrupt frame.  */
+  else
+    addr = sp;
+
+  for (i = 0; i < ARRAY_SIZE (amd64obsd_tf_reg_offset); i++)
+    if (amd64obsd_tf_reg_offset[i] != -1)
+      trad_frame_set_reg_addr (cache, i, addr + amd64obsd_tf_reg_offset[i]);
+
+  /* Read %cs from trap frame.  */
+  addr += amd64obsd_tf_reg_offset[AMD64_CS_REGNUM];
+  cs = read_memory_unsigned_integer (addr, 8, byte_order);
+  if ((cs & I386_SEL_RPL) == I386_SEL_UPL)
+    {
+      /* Trap from user space; terminate backtrace.  */
+      trad_frame_set_id (cache, outer_frame_id);
+    }
+  else
+    {
+      /* Construct the frame ID using the function start.  */
+      trad_frame_set_id (cache, frame_id_build (sp + 16, func));
+    }
+
+  return cache;
+}
+
+static void
+amd64obsd_trapframe_this_id (struct frame_info *this_frame,
+			     void **this_cache, struct frame_id *this_id)
+{
+  struct trad_frame_cache *cache =
+    amd64obsd_trapframe_cache (this_frame, this_cache);
+  
+  trad_frame_get_id (cache, this_id);
+}
+
+static struct value *
+amd64obsd_trapframe_prev_register (struct frame_info *this_frame,
+				   void **this_cache, int regnum)
+{
+  struct trad_frame_cache *cache =
+    amd64obsd_trapframe_cache (this_frame, this_cache);
+
+  return trad_frame_get_register (cache, this_frame, regnum);
+}
+
+static int
+amd64obsd_trapframe_sniffer (const struct frame_unwind *self,
+			     struct frame_info *this_frame,
+			     void **this_prologue_cache)
+{
+  ULONGEST cs;
+  char *name;
+
+  /* Check Current Privilege Level and bail out if we're not executing
+     in kernel space.  */
+  cs = get_frame_register_unsigned (this_frame, AMD64_CS_REGNUM);
+  if ((cs & I386_SEL_RPL) == I386_SEL_UPL)
+    return 0;
+
+  find_pc_partial_function (get_frame_pc (this_frame), &name, NULL, NULL);
+  return (name && ((strcmp (name, "calltrap") == 0)
+		   || (strcmp (name, "osyscall1") == 0)
+		   || (strcmp (name, "Xsyscall") == 0)
+		   || (strncmp (name, "Xintr", 5) == 0)));
+}
+
+static const struct frame_unwind amd64obsd_trapframe_unwind = {
+  /* FIXME: kettenis/20051219: This really is more like an interrupt
+     frame, but SIGTRAMP_FRAME would print <signal handler called>,
+     which really is not what we want here.  */
+  NORMAL_FRAME,
+  amd64obsd_trapframe_this_id,
+  amd64obsd_trapframe_prev_register,
+  NULL,
+  amd64obsd_trapframe_sniffer
+};
+
 
 static void
 amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
@@ -363,6 +473,9 @@ amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   /* OpenBSD uses SVR4-style shared libraries.  */
   set_solib_svr4_fetch_link_map_offsets
     (gdbarch, svr4_lp64_fetch_link_map_offsets);
+
+  /* Unwind kernel trap frames correctly.  */
+  frame_unwind_prepend_unwinder (gdbarch, &amd64obsd_trapframe_unwind);
 }