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helpers.S
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helpers.S
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#include <ppc-asm.h>
#define r1 1
#define STACK_FRAME_SIZE 256
.globl prolog1_start
prolog1_start:
mflr r0
std r0,16(r1)
stdu r1,-STACK_FRAME_SIZE(r1)
/* Save non volatile state onto stack */
mfcr r0
std r0,8(r1)
std r13,32(r1)
std r14,40(r1)
std r15,48(r1)
std r16,56(r1)
std r17,64(r1)
std r18,72(r1)
std r19,80(r1)
std r20,88(r1)
std r21,96(r1)
std r22,104(r1)
std r23,112(r1)
std r24,120(r1)
std r25,128(r1)
std r26,136(r1)
std r27,144(r1)
std r28,152(r1)
std r29,160(r1)
std r30,168(r1)
std r31,176(r1)
/* Save our stack pointer into the save area */
std r1,248(r3)
.globl prolog1_end
prolog1_end:
.globl prolog2_start
prolog2_start:
/* Now prepare for the test case */
/* zero r0 */
li r0,0
/* zero CR */
mtcr r0
/* zero LR */
mtlr r0
/* zero CTR */
mtctr r0
/* zero carry, overflow, etc. */
mtxer r0
.globl prolog2_end
prolog2_end:
.globl epilog1_start
epilog1_start:
/* Add a nop in case the last instruction is a BC+8 */
nop
/* Free up r31 to use as a scratch register */
xor r0,r0,r31
.globl epilog1_end
epilog1_end:
.globl epilog2_start
epilog2_start:
mfcr r0
std r0, 256(r31)
mflr r0
std r0, 264(r31)
mfctr r0
std r0, 272(r31)
mfxer r0
std r0, 280(r31)
/* Restore our stack pointer from the save area */
ld r1,248(r31)
/* Restore non volatile state from stack */
ld r0,8(r1)
mtcr r0
ld r13,32(r1)
ld r14,40(r1)
ld r15,48(r1)
ld r16,56(r1)
ld r17,64(r1)
ld r18,72(r1)
ld r19,80(r1)
ld r20,88(r1)
ld r21,96(r1)
ld r22,104(r1)
ld r23,112(r1)
ld r24,120(r1)
ld r25,128(r1)
ld r26,136(r1)
ld r27,144(r1)
ld r28,152(r1)
ld r29,160(r1)
ld r30,168(r1)
ld r31,176(r1)
addi r1,r1,STACK_FRAME_SIZE
ld r0,16(r1)
mtlr r0
blr
.globl epilog2_end
epilog2_end: