1/* Tests that Valgrind correctly handles syscalls returning
2   either 1 (in %rax) or 2 values (in %rdx:%rax). */
3
4#include <stdio.h>
5#include <sys/syscall.h>
6#include <sys/types.h>
7
8#define GARBAGE 0x0caffedeadbeef
9
10static void syscall_rval(int sysno, uint64_t *rval_hi, uint64_t *rval_lo)
11{
12   __asm__ (
13      "movq %[INPUT1],%%rdx\n"
14      "movq %[SYSCALL_NUMBER],%%rax\n"
15      "syscall\n"
16      "movq %[RVAL_HI],%%rcx\n"
17      "movq %%rdx,(%%rcx)\n"
18      "movq %[RVAL_LO],%%rcx\n"
19      "movq %%rax,(%%rcx)\n"
20      : [RVAL_HI] "=m" (rval_hi), [RVAL_LO] "=m" (rval_lo)	/* output */
21      : [INPUT1] "i" (GARBAGE), [SYSCALL_NUMBER] "g" (sysno)	/* input */
22      : "rax", "rcx", "rdx", "cc", "memory");			/* clobbers */
23}
24
25static int syscall_rval1(void) {
26   uint64_t valHi, valLo;
27
28   /* Syscall lwp_self returns just tid in rax. */
29   valHi = valLo = GARBAGE;
30   syscall_rval(SYS_lwp_self, &valHi, &valLo);
31   if ((valHi != GARBAGE) || (valLo != 1)) {
32      fprintf(stderr, "rval1 FAILED [%#lx:%#lx]\n", valHi, valLo);
33      return 1;
34   }
35
36   return 0;
37}
38
39static int syscall_rval2(void) {
40   uint64_t valHi, valLo;
41
42   /* Syscall getpid returns pid in rax and ppid in rdx. */
43   valHi = valLo = GARBAGE;
44   syscall_rval(SYS_getpid, &valHi, &valLo);
45   if ((valHi == GARBAGE) || (valLo == GARBAGE)) {
46      fprintf(stderr, "rval2 FAILED [%#lx:%#lx]\n", valHi, valLo);
47      return 1;
48   }
49
50   return 0;
51}
52
53int main(void) {
54   int ret = 0;
55
56   ret |= syscall_rval1();
57   ret |= syscall_rval2();
58
59   if (ret != 0)
60     fprintf(stderr, "FAIL\n");
61
62   return ret;
63}
64