ffi.c (FFI_INIT_TRAMPOLINE): Remove hard-coded assembly instructions.

2011-08-25  Andrew Haley  <aph@redhat.com>

        * src/arm/ffi.c (FFI_INIT_TRAMPOLINE): Remove hard-coded assembly
        instructions.
        * src/arm/sysv.S (ffi_arm_trampoline): Put them here instead.

From-SVN: r178060

libffi/ChangeLog

+2011-08-25  Andrew Haley  <aph@redhat.com>
+
+	* src/arm/ffi.c (FFI_INIT_TRAMPOLINE): Remove hard-coded assembly
+	instructions.
+	* src/arm/sysv.S (ffi_arm_trampoline): Put them here instead.
+
 2011-07-11  Andrew Haley  <aph@redhat.com>
 
         * src/arm/ffi.c (FFI_INIT_TRAMPOLINE): Clear icache.

libffi/src/arm/ffi.c

@@ -337,14 +337,14 @@ ffi_prep_incoming_args_SYSV(char *stack, void **rvalue,
 
 /* How to make a trampoline.  */
 
+extern unsigned int ffi_arm_trampoline[3];
+
 #define FFI_INIT_TRAMPOLINE(TRAMP,FUN,CTX)				\
 ({ unsigned char *__tramp = (unsigned char*)(TRAMP);			\
    unsigned int  __fun = (unsigned int)(FUN);				\
    unsigned int  __ctx = (unsigned int)(CTX);				\
    unsigned char *insns = (unsigned char *)(CTX);                       \
-   *(unsigned int*) &__tramp[0] = 0xe92d000f; /* stmfd sp!, {r0-r3} */	\
-   *(unsigned int*) &__tramp[4] = 0xe59f0000; /* ldr r0, [pc] */	\
-   *(unsigned int*) &__tramp[8] = 0xe59ff000; /* ldr pc, [pc] */	\
+   memcpy (__tramp, ffi_arm_trampoline, sizeof ffi_arm_trampoline);     \
    *(unsigned int*) &__tramp[12] = __ctx;				\
    *(unsigned int*) &__tramp[16] = __fun;				\
    __clear_cache((&__tramp[0]), (&__tramp[19])); /* Clear data mapping.  */ \

libffi/src/arm/sysv.S

@@ -461,6 +461,11 @@ ARM_FUNC_START ffi_closure_VFP
 	UNWIND .fnend
         .size    CNAME(ffi_closure_VFP),.ffi_closure_VFP_end-CNAME(ffi_closure_VFP)
 
+ENTRY(ffi_arm_trampoline)
+	stmfd sp!, {r0-r3}
+	ldr r0, [pc]
+	ldr pc, [pc]
+
 #if defined __ELF__ && defined __linux__
 	.section	.note.GNU-stack,"",%progbits
 #endif