diff options
Diffstat (limited to 'tools/testing/selftests/powerpc/security/rfi_flush.c')
| -rw-r--r-- | tools/testing/selftests/powerpc/security/rfi_flush.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/security/rfi_flush.c b/tools/testing/selftests/powerpc/security/rfi_flush.c index 0a7d0afb26b8..93a65bd1f231 100644 --- a/tools/testing/selftests/powerpc/security/rfi_flush.c +++ b/tools/testing/selftests/powerpc/security/rfi_flush.c @@ -10,6 +10,7 @@ #include <stdint.h> #include <malloc.h> #include <unistd.h> +#include <signal.h> #include <stdlib.h> #include <string.h> #include <stdio.h> @@ -41,6 +42,40 @@ static void syscall_loop(char *p, unsigned long iterations, } } +static void sigill_handler(int signr, siginfo_t *info, void *unused) +{ + static int warned = 0; + ucontext_t *ctx = (ucontext_t *)unused; + unsigned long *pc = &UCONTEXT_NIA(ctx); + + /* mtspr 3,RS to check for move to DSCR below */ + if ((*((unsigned int *)*pc) & 0xfc1fffff) == 0x7c0303a6) { + if (!warned++) + printf("WARNING: Skipping over dscr setup. Consider running 'ppc64_cpu --dscr=1' manually.\n"); + *pc += 4; + } else { + printf("SIGILL at %p\n", pc); + abort(); + } +} + +static void set_dscr(unsigned long val) +{ + static int init = 0; + struct sigaction sa; + + if (!init) { + memset(&sa, 0, sizeof(sa)); + sa.sa_sigaction = sigill_handler; + sa.sa_flags = SA_SIGINFO; + if (sigaction(SIGILL, &sa, NULL)) + perror("sigill_handler"); + init = 1; + } + + asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR)); +} + int rfi_flush_test(void) { char *p; @@ -54,6 +89,9 @@ int rfi_flush_test(void) SKIP_IF(geteuid() != 0); + // The PMU event we use only works on Power7 or later + SKIP_IF(!have_hwcap(PPC_FEATURE_ARCH_2_06)); + if (read_debugfs_file("powerpc/rfi_flush", &rfi_flush_org)) { perror("Unable to read powerpc/rfi_flush debugfs file"); SKIP_IF(1); |