ab12c95d3f
Right now translator stops right *after* the end of a page, which breaks reporting of fault locations when the last instruction of a multi-insn translation block crosses a page boundary. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220817150506.592862-3-iii@linux.ibm.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
140 lines
3.4 KiB
C++
140 lines
3.4 KiB
C++
/*
|
|
* Common code for arch-specific MMU_INST_FETCH fault testing.
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
|
|
#include <assert.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/ucontext.h>
|
|
|
|
/* Forward declarations. */
|
|
|
|
static void *arch_mcontext_pc(const mcontext_t *ctx);
|
|
static int arch_mcontext_arg(const mcontext_t *ctx);
|
|
static void arch_flush(void *p, int len);
|
|
|
|
/* Testing infrastructure. */
|
|
|
|
struct noexec_test {
|
|
const char *name;
|
|
const char *test_code;
|
|
int test_len;
|
|
int page_ofs;
|
|
int entry_ofs;
|
|
int expected_si_ofs;
|
|
int expected_pc_ofs;
|
|
int expected_arg;
|
|
};
|
|
|
|
static void *page_base;
|
|
static int page_size;
|
|
static const struct noexec_test *current_noexec_test;
|
|
|
|
static void handle_err(const char *syscall)
|
|
{
|
|
printf("[ FAILED ] %s: %s\n", syscall, strerror(errno));
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
static void handle_segv(int sig, siginfo_t *info, void *ucontext)
|
|
{
|
|
const struct noexec_test *test = current_noexec_test;
|
|
const mcontext_t *mc = &((ucontext_t *)ucontext)->uc_mcontext;
|
|
void *expected_si;
|
|
void *expected_pc;
|
|
void *pc;
|
|
int arg;
|
|
|
|
if (test == NULL) {
|
|
printf("[ FAILED ] unexpected SEGV\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
current_noexec_test = NULL;
|
|
|
|
expected_si = page_base + test->expected_si_ofs;
|
|
if (info->si_addr != expected_si) {
|
|
printf("[ FAILED ] wrong si_addr (%p != %p)\n",
|
|
info->si_addr, expected_si);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
pc = arch_mcontext_pc(mc);
|
|
expected_pc = page_base + test->expected_pc_ofs;
|
|
if (pc != expected_pc) {
|
|
printf("[ FAILED ] wrong pc (%p != %p)\n", pc, expected_pc);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
arg = arch_mcontext_arg(mc);
|
|
if (arg != test->expected_arg) {
|
|
printf("[ FAILED ] wrong arg (%d != %d)\n", arg, test->expected_arg);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
if (mprotect(page_base, page_size,
|
|
PROT_READ | PROT_WRITE | PROT_EXEC) < 0) {
|
|
handle_err("mprotect");
|
|
}
|
|
}
|
|
|
|
static void test_noexec_1(const struct noexec_test *test)
|
|
{
|
|
void *start = page_base + test->page_ofs;
|
|
void (*fn)(int arg) = page_base + test->entry_ofs;
|
|
|
|
memcpy(start, test->test_code, test->test_len);
|
|
arch_flush(start, test->test_len);
|
|
|
|
/* Trigger TB creation in order to test invalidation. */
|
|
fn(0);
|
|
|
|
if (mprotect(page_base, page_size, PROT_NONE) < 0) {
|
|
handle_err("mprotect");
|
|
}
|
|
|
|
/* Trigger SEGV and check that handle_segv() ran. */
|
|
current_noexec_test = test;
|
|
fn(0);
|
|
assert(current_noexec_test == NULL);
|
|
}
|
|
|
|
static int test_noexec(struct noexec_test *tests, size_t n_tests)
|
|
{
|
|
struct sigaction act;
|
|
size_t i;
|
|
|
|
memset(&act, 0, sizeof(act));
|
|
act.sa_sigaction = handle_segv;
|
|
act.sa_flags = SA_SIGINFO;
|
|
if (sigaction(SIGSEGV, &act, NULL) < 0) {
|
|
handle_err("sigaction");
|
|
}
|
|
|
|
page_size = getpagesize();
|
|
page_base = mmap(NULL, 2 * page_size,
|
|
PROT_READ | PROT_WRITE | PROT_EXEC,
|
|
MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
|
|
if (page_base == MAP_FAILED) {
|
|
handle_err("mmap");
|
|
}
|
|
page_base += page_size;
|
|
|
|
for (i = 0; i < n_tests; i++) {
|
|
struct noexec_test *test = &tests[i];
|
|
|
|
printf("[ RUN ] %s\n", test->name);
|
|
test_noexec_1(test);
|
|
printf("[ OK ]\n");
|
|
}
|
|
|
|
printf("[ PASSED ]\n");
|
|
return EXIT_SUCCESS;
|
|
}
|