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tests/tcg: target/s390x: Test MVC

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Let's add a test that especially verifies that no data will be touched
in case we cross page boundaries and one page access triggers a fault.

Before the fault-safe handling fixes, the test failes with:
      TEST    mvc on s390x
    data modified during a fault
    make[2]: *** [../Makefile.target:116: run-mvc] Error 1

Acked-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
David Hildenbrand 2019-09-19 11:21:48 +02:00
parent d9e13c3419
commit 5d69cbdfdd
2 changed files with 110 additions and 0 deletions
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1
tests/tcg/s390x/Makefile.target
View File

@ -7,3 +7,4 @@ TESTS+=exrl-trt
TESTS+=exrl-trtr
TESTS+=pack
TESTS+=mvo
TESTS+=mvc

109
tests/tcg/s390x/mvc.c Normal file
View File

@ -0,0 +1,109 @@
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#include <signal.h>
#include <setjmp.h>
jmp_buf jmp_env;
static void handle_sigsegv(int sig)
{
siglongjmp(jmp_env, 1);
}
#define ALLOC_SIZE (2 * 4096)
static inline void mvc_256(const char *dst, const char *src)
{
asm volatile (
" mvc 0(256,%[dst]),0(%[src])\n"
:
: [dst] "d" (dst),
[src] "d" (src)
: "memory");
}
int main(void)
{
char *src, *dst;
int i;
/* register the SIGSEGV handler */
if (signal(SIGSEGV, handle_sigsegv) == SIG_ERR) {
fprintf(stderr, "SIGSEGV not registered\n");
return 1;
}
/* prepare the buffers - two consecutive pages */
src = valloc(ALLOC_SIZE);
dst = valloc(ALLOC_SIZE);
memset(src, 0xff, ALLOC_SIZE);
memset(dst, 0x0, ALLOC_SIZE);
/* protect the second pages */
if (mprotect(src + 4096, 4096, PROT_NONE) ||
mprotect(dst + 4096, 4096, PROT_NONE)) {
fprintf(stderr, "mprotect failed\n");
return 1;
}
/* fault on second destination page */
if (sigsetjmp(jmp_env, 1) == 0) {
mvc_256(dst + 4096 - 128, src);
fprintf(stderr, "fault not triggered\n");
return 1;
}
/* fault on second source page */
if (sigsetjmp(jmp_env, 1) == 0) {
mvc_256(dst, src + 4096 - 128);
fprintf(stderr, "fault not triggered\n");
return 1;
}
/* fault on second source and second destination page */
if (sigsetjmp(jmp_env, 1) == 0) {
mvc_256(dst + 4096 - 128, src + 4096 - 128);
fprintf(stderr, "fault not triggered\n");
return 1;
}
/* restore permissions */
if (mprotect(src + 4096, 4096, PROT_READ | PROT_WRITE) ||
mprotect(dst + 4096, 4096, PROT_READ | PROT_WRITE)) {
fprintf(stderr, "mprotect failed\n");
return 1;
}
/* no data must be touched during the faults */
for (i = 0; i < ALLOC_SIZE; i++) {
if (src[i] != 0xff || dst[i]) {
fprintf(stderr, "data modified during a fault\n");
return 1;
}
}
/* test if MVC works now correctly accross page boundaries */
mvc_256(dst + 4096 - 128, src + 4096 - 128);
for (i = 0; i < ALLOC_SIZE; i++) {
if (src[i] != 0xff) {
fprintf(stderr, "src modified\n");
return 1;
}
if (i < 4096 - 128 || i >= 4096 + 128) {
if (dst[i]) {
fprintf(stderr, "wrong dst modified\n");
return 1;
}
} else {
if (dst[i] != 0xff) {
fprintf(stderr, "wrong data moved\n");
return 1;
}
}
}
return 0;
}