--- /dev/null
+CC := $(CROSS_COMPILE)gcc
+PROGS := switch_endian_test
+
+ASFLAGS += -O2 -Wall -g -nostdlib -m64
+
+all: $(PROGS)
+
+switch_endian_test: check-reversed.S
+
+check-reversed.o: check.o
+ $(CROSS_COMPILE)objcopy -j .text --reverse-bytes=4 -O binary $< $@
+
+check-reversed.S: check-reversed.o
+ hexdump -v -e '/1 ".byte 0x%02X\n"' $< > $@
+
+run_tests: all
+ @-for PROG in $(PROGS); do \
+ ./$$PROG; \
+ done;
+
+clean:
+ rm -f $(PROGS) *.o check-reversed.S
+
+.PHONY: all run_tests clean
--- /dev/null
+#include "common.h"
+
+/*
+ * Checks that registers contain what we expect, ie. they were not clobbered by
+ * the syscall.
+ *
+ * r15: pattern to check registers against.
+ *
+ * At the end r3 == 0 if everything's OK.
+ */
+ nop # guaranteed to be illegal in reverse-endian
+ mr r9,r15
+ cmpd r9,r3 # check r3
+ bne 1f
+ addi r9,r15,4 # check r4
+ cmpd r9,r4
+ bne 1f
+ lis r9,0x00FF # check CR
+ ori r9,r9,0xF000
+ mfcr r10
+ and r10,r10,r9
+ cmpw r9,r10
+ addi r9,r15,34
+ bne 1f
+ addi r9,r15,32 # check LR
+ mflr r10
+ cmpd r9,r10
+ bne 1f
+ addi r9,r15,5 # check r5
+ cmpd r9,r5
+ bne 1f
+ addi r9,r15,6 # check r6
+ cmpd r9,r6
+ bne 1f
+ addi r9,r15,7 # check r7
+ cmpd r9,r7
+ bne 1f
+ addi r9,r15,8 # check r8
+ cmpd r9,r8
+ bne 1f
+ addi r9,r15,13 # check r13
+ cmpd r9,r13
+ bne 1f
+ addi r9,r15,14 # check r14
+ cmpd r9,r14
+ bne 1f
+ addi r9,r15,16 # check r16
+ cmpd r9,r16
+ bne 1f
+ addi r9,r15,17 # check r17
+ cmpd r9,r17
+ bne 1f
+ addi r9,r15,18 # check r18
+ cmpd r9,r18
+ bne 1f
+ addi r9,r15,19 # check r19
+ cmpd r9,r19
+ bne 1f
+ addi r9,r15,20 # check r20
+ cmpd r9,r20
+ bne 1f
+ addi r9,r15,21 # check r21
+ cmpd r9,r21
+ bne 1f
+ addi r9,r15,22 # check r22
+ cmpd r9,r22
+ bne 1f
+ addi r9,r15,23 # check r23
+ cmpd r9,r23
+ bne 1f
+ addi r9,r15,24 # check r24
+ cmpd r9,r24
+ bne 1f
+ addi r9,r15,25 # check r25
+ cmpd r9,r25
+ bne 1f
+ addi r9,r15,26 # check r26
+ cmpd r9,r26
+ bne 1f
+ addi r9,r15,27 # check r27
+ cmpd r9,r27
+ bne 1f
+ addi r9,r15,28 # check r28
+ cmpd r9,r28
+ bne 1f
+ addi r9,r15,29 # check r29
+ cmpd r9,r29
+ bne 1f
+ addi r9,r15,30 # check r30
+ cmpd r9,r30
+ bne 1f
+ addi r9,r15,31 # check r31
+ cmpd r9,r31
+ bne 1f
+ b 2f
+1: mr r3, r9
+ li r0, __NR_exit
+ sc
+2: li r0, __NR_switch_endian
+ nop
--- /dev/null
+#include "common.h"
+
+ .data
+ .balign 8
+message:
+ .ascii "success: switch_endian_test\n\0"
+
+ .section ".toc"
+ .balign 8
+pattern:
+ .llong 0x5555AAAA5555AAAA
+
+ .text
+FUNC_START(_start)
+ /* Load the pattern */
+ ld r15, pattern@TOC(%r2)
+
+ /* Setup CR, only CR2-CR4 are maintained */
+ lis r3, 0x00FF
+ ori r3, r3, 0xF000
+ mtcr r3
+
+ /* Load the pattern slightly modified into the registers */
+ mr r3, r15
+ addi r4, r15, 4
+
+ addi r5, r15, 32
+ mtlr r5
+
+ addi r5, r15, 5
+ addi r6, r15, 6
+ addi r7, r15, 7
+ addi r8, r15, 8
+
+ /* r9 - r12 are clobbered */
+
+ addi r13, r15, 13
+ addi r14, r15, 14
+
+ /* Skip r15 we're using it */
+
+ addi r16, r15, 16
+ addi r17, r15, 17
+ addi r18, r15, 18
+ addi r19, r15, 19
+ addi r20, r15, 20
+ addi r21, r15, 21
+ addi r22, r15, 22
+ addi r23, r15, 23
+ addi r24, r15, 24
+ addi r25, r15, 25
+ addi r26, r15, 26
+ addi r27, r15, 27
+ addi r28, r15, 28
+ addi r29, r15, 29
+ addi r30, r15, 30
+ addi r31, r15, 31
+
+ /*
+ * Call the syscall to switch endian.
+ * It clobbers r9-r12, XER, CTR and CR0-1,5-7.
+ */
+ li r0, __NR_switch_endian
+ sc
+
+#include "check-reversed.S"
+
+ /* Flip back, r0 already has the switch syscall number */
+ .long 0x02000044 /* sc */
+
+#include "check.S"
+
+ li r0, __NR_write
+ li r3, 1 /* stdout */
+ ld r4, message@got(%r2)
+ li r5, 28 /* strlen(message3) */
+ sc
+ li r0, __NR_exit
+ li r3, 0
+ sc
+ b .