qemu/tests/tcg/s390x/branch-relative-long.c
Ilya Leoshkevich 0c5c4d5b3c tests/tcg/s390x: Use a different PCRel32 notation in branch-relative-long.c
Binutils >=2.37 and Clang do not accept (. - 0x100000000) PCRel32
constants. While this looks like a bug that needs fixing, use a
different notation (-0x100000000) as a workaround.

Reported-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <20220502164830.1622191-1-iii@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
2022-05-04 08:47:19 +02:00

69 lines
1.6 KiB
C

#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <sys/mman.h>
#define DEFINE_ASM(_name, _code) \
extern const char _name[]; \
extern const char _name ## _end[]; \
asm(" .globl " #_name "\n" \
#_name ":\n" \
" " _code "\n" \
" .globl " #_name "_end\n" \
#_name "_end:\n");
DEFINE_ASM(br_r14, "br %r14");
DEFINE_ASM(brasl_r0, "brasl %r0,-0x100000000");
DEFINE_ASM(brcl_0xf, "brcl 0xf,-0x100000000");
struct test {
const char *code;
const char *code_end;
};
static const struct test tests[] = {
{
.code = brasl_r0,
.code_end = brasl_r0_end,
},
{
.code = brcl_0xf,
.code_end = brcl_0xf_end,
},
};
int main(void)
{
unsigned char *buf;
size_t length = 0;
size_t i;
for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
size_t test_length = 0x100000000 + (tests[i].code_end - tests[i].code);
if (test_length > length) {
length = test_length;
}
}
buf = mmap(NULL, length, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
if (buf == MAP_FAILED) {
perror("SKIP: mmap() failed");
return 0;
}
memcpy(buf, br_r14, br_r14_end - br_r14);
for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
void (*code)(void) = (void *)(buf + 0x100000000);
memcpy(code, tests[i].code, tests[i].code_end - tests[i].code);
code();
memset(code, 0, tests[i].code_end - tests[i].code);
}
munmap(buf, length);
return 0;
}