This adds a test of the switch_endian() syscall we added in the previous commit.
We test it by calling the endian switch syscall, and then executing some code in the other endian to check everything went as expected. That code checks registers we expect to be maintained are, and then writes to stdout. If the endian switch failed to happen that code sequence will be illegal and cause the test to abort. We then switch back to the original endian, do the same checks and finally write a success message and exit(0). Signed-off-by: Michael Ellerman <m...@ellerman.id.au> --- v3: Have the test switch back to the original endian. tools/testing/selftests/powerpc/Makefile | 2 +- .../selftests/powerpc/switch_endian/Makefile | 23 +++++ .../selftests/powerpc/switch_endian/check.S | 101 +++++++++++++++++++++ .../selftests/powerpc/switch_endian/common.h | 6 ++ .../powerpc/switch_endian/switch_endian_test.S | 92 +++++++++++++++++++ 5 files changed, 223 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/powerpc/switch_endian/Makefile create mode 100644 tools/testing/selftests/powerpc/switch_endian/check.S create mode 100644 tools/testing/selftests/powerpc/switch_endian/common.h create mode 100644 tools/testing/selftests/powerpc/switch_endian/switch_endian_test.S diff --git a/tools/testing/selftests/powerpc/Makefile b/tools/testing/selftests/powerpc/Makefile index 1d5e7ad2c460..85c24a2210b5 100644 --- a/tools/testing/selftests/powerpc/Makefile +++ b/tools/testing/selftests/powerpc/Makefile @@ -13,7 +13,7 @@ CFLAGS := -Wall -O2 -flto -Wall -Werror -DGIT_VERSION='"$(GIT_VERSION)"' -I$(CUR export CC CFLAGS -TARGETS = pmu copyloops mm tm primitives stringloops +TARGETS = pmu copyloops mm tm primitives stringloops switch_endian endif diff --git a/tools/testing/selftests/powerpc/switch_endian/Makefile b/tools/testing/selftests/powerpc/switch_endian/Makefile new file mode 100644 index 000000000000..c7fefbf880b5 --- /dev/null +++ b/tools/testing/selftests/powerpc/switch_endian/Makefile @@ -0,0 +1,23 @@ +PROGS := switch_endian_test + +ASFLAGS += -O2 -Wall -g -nostdlib -m64 + +all: $(PROGS) + +switch_endian_test: check-reversed.S + +check-reversed.o: check.o + 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 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 000000000000..671d20ab9cf9 --- /dev/null +++ b/tools/testing/selftests/powerpc/switch_endian/check.S @@ -0,0 +1,101 @@ +#include "common.h" + +/* + * Checks that registers contain what we expect, ie. they were not clobbered by + * the syscall. If that all works we then print a message. + * + * r14: address of message to print (size is hardcoded at 25 bytes) + * r15: pattern to check registers against. + * + * At the end r3 == 0 if everything's OK. + */ + nop # guaranteed to be illegal in reverse-endian + cmpd r15,r3 + bne 1f + addi r3,r15,4 + cmpd r3,r4 + bne 1f + lis r3,0x00FF + ori r3,r3,0xF000 + mfcr r4 + and r4,r4,r3 + cmpw r3,r4 + addi r3,r15,34 + bne 1f + addi r3,r15,32 + mflr r4 + cmpd r3,r4 + bne 1f + addi r3,r15,5 + cmpd r3,r5 + bne 1f + addi r3,r15,6 + cmpd r3,r6 + bne 1f + addi r3,r15,7 + cmpd r3,r7 + bne 1f + addi r3,r15,8 + cmpd r3,r8 + bne 1f + addi r3,r15,13 + cmpd r3,r13 + bne 1f + addi r3,r15,16 + cmpd r3,r16 + bne 1f + addi r3,r15,17 + cmpd r3,r17 + bne 1f + addi r3,r15,18 + cmpd r3,r18 + bne 1f + addi r3,r15,19 + cmpd r3,r19 + bne 1f + addi r3,r15,20 + cmpd r3,r20 + bne 1f + addi r3,r15,21 + cmpd r3,r21 + bne 1f + addi r3,r15,22 + cmpd r3,r22 + bne 1f + addi r3,r15,23 + cmpd r3,r23 + bne 1f + addi r3,r15,24 + cmpd r3,r24 + bne 1f + addi r3,r15,25 + cmpd r3,r25 + bne 1f + addi r3,r15,26 + cmpd r3,r26 + bne 1f + addi r3,r15,27 + cmpd r3,r27 + bne 1f + addi r3,r15,28 + cmpd r3,r28 + bne 1f + addi r3,r15,29 + cmpd r3,r29 + bne 1f + addi r3,r15,30 + cmpd r3,r30 + bne 1f + addi r3,r15,31 + cmpd r3,r31 + bne 1f + li r0,4 + li r3,1 /* stdout */ + mr r4,r14 + li r5,25 /* strlen(message) */ + sc + b 2f +1: 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 000000000000..69e399698c64 --- /dev/null +++ b/tools/testing/selftests/powerpc/switch_endian/common.h @@ -0,0 +1,6 @@ +#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 000000000000..f26475a9f811 --- /dev/null +++ b/tools/testing/selftests/powerpc/switch_endian/switch_endian_test.S @@ -0,0 +1,92 @@ +#include "common.h" + + .data + .balign 8 +message1: + .ascii "Hello wrong-endian world\n\0" + +message2: + .ascii "Hello right-endian world\n\0" + +message3: + .ascii "success: switch_endian_test\n\0" + + .section ".toc" + .balign 8 +pattern: + .llong 0x5555AAAA5555AAAA + + .text +FUNC_START(_start) + /* Load some addresses to start with */ + ld r14, message1@got(%r2) + 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 + + /* Skip r14 & r15 we're using them */ + + 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 */ + + ld r14, message2@got(%r2) + mr r3, r15 + addi r4, r15, 4 + addi r5, r15, 5 + +#include "check.S" + + li r0, __NR_write + li r3, 1 /* stdout */ + ld r4, message3@got(%r2) + li r5, 28 /* strlen(message3) */ + sc + li r0, __NR_exit + li r3, 0 + sc + b . -- 2.1.0 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
