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/* Tests that Valgrind correctly handles syscalls returning
either 1 (in %rax) or 2 values (in %rdx:%rax). */
#include <stdio.h>
#include <sys/syscall.h>
#include <sys/types.h>
#define GARBAGE 0x0caffedeadbeef
static void syscall_rval(int sysno, uint64_t *rval_hi, uint64_t *rval_lo)
{
__asm__ (
"movq %[INPUT1],%%rdx\n"
"movq %[SYSCALL_NUMBER],%%rax\n"
"syscall\n"
"movq %[RVAL_HI],%%rcx\n"
"movq %%rdx,(%%rcx)\n"
"movq %[RVAL_LO],%%rcx\n"
"movq %%rax,(%%rcx)\n"
: [RVAL_HI] "=m" (rval_hi), [RVAL_LO] "=m" (rval_lo) /* output */
: [INPUT1] "i" (GARBAGE), [SYSCALL_NUMBER] "g" (sysno) /* input */
: "rax", "rcx", "rdx", "cc", "memory"); /* clobbers */
}
static int syscall_rval1(void) {
uint64_t valHi, valLo;
/* Syscall lwp_self returns just tid in rax. */
valHi = valLo = GARBAGE;
syscall_rval(SYS_lwp_self, &valHi, &valLo);
if ((valHi != GARBAGE) || (valLo != 1)) {
fprintf(stderr, "rval1 FAILED [%#lx:%#lx]\n", valHi, valLo);
return 1;
}
return 0;
}
static int syscall_rval2(void) {
uint64_t valHi, valLo;
/* Syscall getpid returns pid in rax and ppid in rdx. */
valHi = valLo = GARBAGE;
syscall_rval(SYS_getpid, &valHi, &valLo);
if ((valHi == GARBAGE) || (valLo == GARBAGE)) {
fprintf(stderr, "rval2 FAILED [%#lx:%#lx]\n", valHi, valLo);
return 1;
}
return 0;
}
int main(void) {
int ret = 0;
ret |= syscall_rval1();
ret |= syscall_rval2();
if (ret != 0)
fprintf(stderr, "FAIL\n");
return ret;
}
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