The register numbers used in x86-64's .eh_frame entries neither matched the
ABI nor the gcc implementation. Additionally, a significant amount of
registers were missing in both 32- and 64-bit modes (even now there are, but
only those for which there don't appear to be register numbers assigned in
the respective ABI).

Built and tested on i686-pc-linux-gnu (including a cross version targeting
x86_64-unknown-linux-gnu).

Jan

gas/
2004-11-25 Jan Beulich  <jbeulich@novell.com>

	* config/tc-i386.c (tc_x86_regname_to_dw2regnum): Correct 64-bit mode
	names to match ABI. Add more registers for 32-bit and 64-bit modes.
	Make name array static and const. Adjust lookup to account for NULL
	entries (standing for unused register numbers).

--- /home/jbeulich/src/binutils/mainline/2004-11-25.14.46/gas/config/tc-i386.c	2004-11-23 09:35:34.000000000 +0100
+++ 2004-11-25.14.46/gas/config/tc-i386.c	2004-11-25 15:16:34.709475200 +0100
@@ -6628,21 +6628,36 @@ tc_x86_regname_to_dw2regnum (const char 
 {
   unsigned int regnum;
   unsigned int regnames_count;
-  char *regnames_32[] =
+  static const char *const regnames_32[] =
     {
       "eax", "ecx", "edx", "ebx",
       "esp", "ebp", "esi", "edi",
-      "eip"
+      "eip", "eflags", NULL,
+      "st0", "st1", "st2", "st3",
+      "st4", "st5", "st6", "st7",
+      NULL, NULL,
+      "xmm0", "xmm1", "xmm2", "xmm3",
+      "xmm4", "xmm5", "xmm6", "xmm7",
+      "mm0", "mm1", "mm2", "mm3",
+      "mm4", "mm5", "mm6", "mm7"
     };
-  char *regnames_64[] =
+  static const char *const regnames_64[] =
     {
-      "rax", "rbx", "rcx", "rdx",
-      "rdi", "rsi", "rbp", "rsp",
-      "r8", "r9", "r10", "r11",
+      "rax", "rdx", "rcx", "rbx",
+      "rsi", "rdi", "rbp", "rsp",
+      "r8",  "r9",  "r10", "r11",
       "r12", "r13", "r14", "r15",
-      "rip"
+      "rip",
+      "xmm0",  "xmm1",  "xmm2",  "xmm3",
+      "xmm4",  "xmm5",  "xmm6",  "xmm7",
+      "xmm8",  "xmm9",  "xmm10", "xmm11",
+      "xmm12", "xmm13", "xmm14", "xmm15",
+      "st0", "st1", "st2", "st3",
+      "st4", "st5", "st6", "st7",
+      "mm0", "mm1", "mm2", "mm3",
+      "mm4", "mm5", "mm6", "mm7"
     };
-  char **regnames;
+  const char *const *regnames;
 
   if (flag_code == CODE_64BIT)
     {
@@ -6656,7 +6671,8 @@ tc_x86_regname_to_dw2regnum (const char 
     }
 
   for (regnum = 0; regnum < regnames_count; regnum++)
-    if (strcmp (regname, regnames[regnum]) == 0)
+    if (regnames[regnum] != NULL
+	&& strcmp (regname, regnames[regnum]) == 0)
       return regnum;
 
   return -1;