re PR target/3724 ([ARM]Illegal instruction when profiling optimized code on arm-linux)

PR target/3724
* arm/linux-elf.h (PROFILE_HOOK): Define.

From-SVN: r67950

gcc/ChangeLog

 2003-06-14  Richard Earnshaw  <rearnsha@arm.com>
 
+	PR target/3724
+	* arm/linux-elf.h (PROFILE_HOOK): Define.
+
+2003-06-14  Richard Earnshaw  <rearnsha@arm.com>
+
 	PR target/11183
 	* arm.h (CANNOT_CHANGE_MODE_CLASS): Define.
 

gcc/config/arm/linux-elf.h

@@ -120,5 +120,10 @@
   fprintf (STREAM, "\tbl\tmcount%s\n", NEED_PLT_RELOC ? "(PLT)" : "");	\
 }
 
+/* The linux profiler clobbers the link register.  Make sure the
+   prologue knows to save it.  */
+#define PROFILE_HOOK(X)						\
+  emit_insn (gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (SImode, LR_REGNUM)))
+
 #undef  CC1_SPEC
 #define CC1_SPEC "%{profile:-p}"