diff options
Diffstat (limited to 'tools/testing/selftests/powerpc/switch_endian')
5 files changed, 226 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/switch_endian/.gitignore b/tools/testing/selftests/powerpc/switch_endian/.gitignore new file mode 100644 index 000000000..30e962cf8 --- /dev/null +++ b/tools/testing/selftests/powerpc/switch_endian/.gitignore @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only +switch_endian_test +check-reversed.S diff --git a/tools/testing/selftests/powerpc/switch_endian/Makefile b/tools/testing/selftests/powerpc/switch_endian/Makefile new file mode 100644 index 000000000..bdc081afe --- /dev/null +++ b/tools/testing/selftests/powerpc/switch_endian/Makefile @@ -0,0 +1,18 @@ +# SPDX-License-Identifier: GPL-2.0 +TEST_GEN_PROGS := switch_endian_test + +ASFLAGS += -O2 -Wall -g -nostdlib -m64 + +EXTRA_CLEAN = $(OUTPUT)/*.o $(OUTPUT)/check-reversed.S + +top_srcdir = ../../../../.. +include ../../lib.mk + +$(OUTPUT)/switch_endian_test: ASFLAGS += -I $(OUTPUT) +$(OUTPUT)/switch_endian_test: $(OUTPUT)/check-reversed.S + +$(OUTPUT)/check-reversed.o: $(OUTPUT)/check.o + $(CROSS_COMPILE)objcopy -j .text --reverse-bytes=4 -O binary $< $@ + +$(OUTPUT)/check-reversed.S: $(OUTPUT)/check-reversed.o + hexdump -v -e '/1 ".byte 0x%02X\n"' $< > $@ diff --git a/tools/testing/selftests/powerpc/switch_endian/check.S b/tools/testing/selftests/powerpc/switch_endian/check.S new file mode 100644 index 000000000..927a5c675 --- /dev/null +++ b/tools/testing/selftests/powerpc/switch_endian/check.S @@ -0,0 +1,101 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#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 diff --git a/tools/testing/selftests/powerpc/switch_endian/common.h b/tools/testing/selftests/powerpc/switch_endian/common.h new file mode 100644 index 000000000..1434cbc2a --- /dev/null +++ b/tools/testing/selftests/powerpc/switch_endian/common.h @@ -0,0 +1,7 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include <ppc-asm.h> +#include <asm/unistd.h> + +#ifndef __NR_switch_endian +#define __NR_switch_endian 363 +#endif diff --git a/tools/testing/selftests/powerpc/switch_endian/switch_endian_test.S b/tools/testing/selftests/powerpc/switch_endian/switch_endian_test.S new file mode 100644 index 000000000..7887f78cf --- /dev/null +++ b/tools/testing/selftests/powerpc/switch_endian/switch_endian_test.S @@ -0,0 +1,97 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include "common.h" + + .data + .balign 8 +success_message: + .ascii "success: switch_endian_test\n\0" + + .balign 8 +failure_message: + .ascii "failure: switch_endian_test\n\0" + + .section ".toc" + .balign 8 +pattern: + .8byte 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 + + tdi 0, 0, 0x48 // b +8 if the endian was switched + b .Lfail // exit if endian didn't switch + +#include "check-reversed.S" + + /* Flip back, r0 already has the switch syscall number */ + .long 0x02000044 /* sc */ + +#include "check.S" + + ld r4, success_message@got(%r2) + li r5, 28 // strlen(success_message) + li r14, 0 // exit status +.Lout: + li r0, __NR_write + li r3, 1 /* stdout */ + sc + li r0, __NR_exit + mr r3, r14 + sc + b . + +.Lfail: + ld r4, failure_message@got(%r2) + li r5, 28 // strlen(failure_message) + li r14, 1 + b .Lout |