H.J. Lu <hongjiu.lu@intel.com>

* amd64-tdep.c (amd64_analyze_prologue): Additionally check for
`movl %esp, %ebp' for the X32 ABI.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index f344547..979909a 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2012-05-07  Mark Kettenis  <kettenis@gnu.org>
+           H.J. Lu  <hongjiu.lu@intel.com>
+
+       * amd64-tdep.c (amd64_analyze_prologue): Additionally check for
+       `movl %esp, %ebp' for the X32 ABI.
+
 2012-05-07  Tom Tromey  <tromey@redhat.com>
 
        * dwarf2read.c (dwarf_tag_name): Return const char *.  Use

diff --git a/gdb/amd64-tdep.c b/gdb/amd64-tdep.c
index 685fa48..b433e1f 100644 (file)
--- a/gdb/amd64-tdep.c
+++ b/gdb/amd64-tdep.c
@@ -1867,8 +1867,14 @@ amd64_analyze_stack_align (CORE_ADDR pc, CORE_ADDR current_pc,
       pushq %rbp        0x55
       movq %rsp, %rbp   0x48 0x89 0xe5 (or 0x48 0x8b 0xec)
 
-   Any function that doesn't start with this sequence will be assumed
-   to have no prologue and thus no valid frame pointer in %rbp.  */
+   or (for the X32 ABI):
+
+      pushq %rbp        0x55
+      movl %esp, %ebp   0x89 0xe5 (or 0x8b 0xec)
+
+   Any function that doesn't start with one of these sequences will be
+   assumed to have no prologue and thus no valid frame pointer in
+   %rbp.  */
 
 static CORE_ADDR
 amd64_analyze_prologue (struct gdbarch *gdbarch,
@@ -1879,6 +1885,10 @@ amd64_analyze_prologue (struct gdbarch *gdbarch,
   /* There are two variations of movq %rsp, %rbp.  */
   static const gdb_byte mov_rsp_rbp_1[3] = { 0x48, 0x89, 0xe5 };
   static const gdb_byte mov_rsp_rbp_2[3] = { 0x48, 0x8b, 0xec };
+  /* Ditto for movl %esp, %ebp.  */
+  static const gdb_byte mov_esp_ebp_1[2] = { 0x89, 0xe5 };
+  static const gdb_byte mov_esp_ebp_2[2] = { 0x8b, 0xec };
+
   gdb_byte buf[3];
   gdb_byte op;
 
@@ -1900,15 +1910,30 @@ amd64_analyze_prologue (struct gdbarch *gdbarch,
       if (current_pc <= pc + 1)
         return current_pc;
 
-      /* Check for `movq %rsp, %rbp'.  */
       read_memory (pc + 1, buf, 3);
-      if (memcmp (buf, mov_rsp_rbp_1, 3) != 0
-         && memcmp (buf, mov_rsp_rbp_2, 3) != 0)
-       return pc + 1;
 
-      /* OK, we actually have a frame.  */
-      cache->frameless_p = 0;
-      return pc + 4;
+      /* Check for `movq %rsp, %rbp'.  */
+      if (memcmp (buf, mov_rsp_rbp_1, 3) == 0
+         || memcmp (buf, mov_rsp_rbp_2, 3) == 0)
+       {
+         /* OK, we actually have a frame.  */
+         cache->frameless_p = 0;
+         return pc + 4;
+       }
+
+      /* For X32, also check for `movq %esp, %ebp'.  */
+      if (gdbarch_ptr_bit (gdbarch) == 32)
+       {
+         if (memcmp (buf, mov_esp_ebp_1, 2) == 0
+             || memcmp (buf, mov_esp_ebp_2, 2) == 0)
+           {
+             /* OK, we actually have a frame.  */
+             cache->frameless_p = 0;
+             return pc + 3;
+           }
+       }
+
+      return pc + 1;
     }
 
   return pc;