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 which writes to stdout and then does exit(0). If the endian switch failed to happen that code sequence will be illegal and cause the test to abort. Signed-off-by: Michael Ellerman <m...@ellerman.id.au> --- tools/testing/selftests/powerpc/Makefile | 2 +- tools/testing/selftests/powerpc/syscalls/Makefile | 15 ++++++++ .../selftests/powerpc/syscalls/endian-test.S | 43 ++++++++++++++++++++++ 3 files changed, 59 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/powerpc/syscalls/Makefile create mode 100644 tools/testing/selftests/powerpc/syscalls/endian-test.S diff --git a/tools/testing/selftests/powerpc/Makefile b/tools/testing/selftests/powerpc/Makefile index 1d5e7ad2c460..5da93b7d1330 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 syscalls endif diff --git a/tools/testing/selftests/powerpc/syscalls/Makefile b/tools/testing/selftests/powerpc/syscalls/Makefile new file mode 100644 index 000000000000..b74201fa4f15 --- /dev/null +++ b/tools/testing/selftests/powerpc/syscalls/Makefile @@ -0,0 +1,15 @@ +PROGS := endian-test + +endian-test: ASFLAGS += -O2 -Wall -g -nostdlib -m64 + +all: $(PROGS) + +run_tests: all + @-for PROG in $(PROGS); do \ + ./$$PROG; \ + done; + +clean: + rm -f $(PROGS) + +.PHONY: all run_tests clean diff --git a/tools/testing/selftests/powerpc/syscalls/endian-test.S b/tools/testing/selftests/powerpc/syscalls/endian-test.S new file mode 100644 index 000000000000..ba596eb9925f --- /dev/null +++ b/tools/testing/selftests/powerpc/syscalls/endian-test.S @@ -0,0 +1,43 @@ +#include <ppc-asm.h> +#include <asm/unistd.h> + + .data + .balign 8 +message: + .ascii "success: endian-test\n" + + .text +FUNC_START(_start) + ld r14, message@got(%r2) + + /* Call the syscall to flip endian */ + li r0, 363 + sc + + /* + * The longs below encode the following code snippet, in the other + * endian. We preloaded the address of message into r14 in case it + * moves. + * + * li r0, __NR_write + * li r3, 1 # stdout + * mr r4, r14 # Get &message + * li r5, 21 # strlen(message) + * sc + * li r0, __NR_exit + * li r3, 0 # exit(0) + * sc + * b . + * + * In both cases, if the endian has not been flipped the processor will + * see an illegal instruction and the process will exit abnormally. + */ + .long 0x04000038 + .long 0x01006038 + .long 0x7873c47d + .long 0x1500a038 + .long 0x02000044 + .long 0x01000038 + .long 0x00006038 + .long 0x02000044 + .long 0x00000048 -- 2.1.0 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
