Signed-off-by: Cyril Bur <cyril...@gmail.com> --- tools/testing/selftests/powerpc/syscalls/Makefile | 3 +- .../testing/selftests/powerpc/syscalls/spr_fork.c | 78 ++++++++++++++++++++++ 2 files changed, 80 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/powerpc/syscalls/spr_fork.c
diff --git a/tools/testing/selftests/powerpc/syscalls/Makefile b/tools/testing/selftests/powerpc/syscalls/Makefile index 291ba45..55969f3 100644 --- a/tools/testing/selftests/powerpc/syscalls/Makefile +++ b/tools/testing/selftests/powerpc/syscalls/Makefile @@ -1,4 +1,4 @@ -TEST_PROGS := ipc_unmuxed spr_exec +TEST_PROGS := ipc_unmuxed spr_exec spr_fork CFLAGS += -I../../../../../usr/include @@ -6,6 +6,7 @@ all: $(TEST_PROGS) $(TEST_PROGS): ../harness.c spr_exec: ../utils.c +spr_fork: ../utils.c include ../../lib.mk diff --git a/tools/testing/selftests/powerpc/syscalls/spr_fork.c b/tools/testing/selftests/powerpc/syscalls/spr_fork.c new file mode 100644 index 0000000..1a351a6 --- /dev/null +++ b/tools/testing/selftests/powerpc/syscalls/spr_fork.c @@ -0,0 +1,78 @@ +/* + * Copyright 2016, Cyril Bur, IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * This test checks that the TAR register (an SPR) is correctly preserved + * across a fork() + */ +#include <asm/cputable.h> +#include <stdlib.h> +#include <stdio.h> +#include <sys/auxv.h> +#include <sys/wait.h> +#include <unistd.h> + +#include "utils.h" + +static int fork_spr(void) +{ + int child_ret; + unsigned long tar; + pid_t pid; + int i; + + + /* Do it a few times as there is a chance that one might luckily pass */ + i = 0; + while (i < 10) { + /* What are the odds... */ + tar = 0x123456; + asm __volatile__( + "mtspr 815, %[tar]" + : + : [tar] "r" (tar) + ); + + pid = fork(); + FAIL_IF(pid == -1); + asm __volatile__( + "mfspr %[tar], 815" + : [tar] "=r" (tar) + ); + + FAIL_IF(tar != 0x123456); + + if (pid == 0) + exit(0); + + FAIL_IF(waitpid(pid, &child_ret, 0) == -1); + + /* Child haddn't exited ? */ + FAIL_IF(!WIFEXITED(child_ret)); + + /* Child detected a bad tar */ + FAIL_IF(WEXITSTATUS(child_ret)); + + /* Reset it */ + tar = 0; + asm __volatile__( + "mtspr 815, %[tar]" + : + : [tar] "r" (tar) + ); + + i++; + } + + return 0; +} + +int main(int argc, char *argv[]) +{ + SKIP_IF(!have_hwcap2(PPC_FEATURE2_TAR)); + return test_harness(fork_spr, "spr_fork"); +} -- 2.7.4 _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev