1 /* Test if SSE valus are correctly propagated into and out of a signal handler
2 and also check that the same applies for uninitialised values and their
3 origins. */
4
5 #include <assert.h>
6 #include <signal.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <unistd.h>
10 #include <sys/syscall.h>
11 #include <sys/ucontext.h>
12
13 static siginfo_t si;
14 static ucontext_t uc;
15 /* x0 is always zero, but is visible to Valgrind as uninitialised. */
16 static upad128_t x0;
17 static upad128_t d0 = {0};
18
sighandler(int sig,siginfo_t * sip,ucontext_t * ucp)19 static void sighandler(int sig, siginfo_t *sip, ucontext_t *ucp)
20 {
21 si = *sip;
22 uc = *ucp;
23
24 ucp->uc_mcontext.fpregs.fp_reg_set.fpchip_state.xmm[0] = d0;
25 ucp->uc_mcontext.fpregs.fp_reg_set.fpchip_state.xmm[1] = x0;
26 }
27
main(void)28 int main(void)
29 {
30 struct sigaction sa;
31 pid_t pid;
32 upad128_t out[8];
33 upad128_t y0;
34 struct fpchip_state *fs = &uc.uc_mcontext.fpregs.fp_reg_set.fpchip_state;
35
36 /* Uninitialised, but we know px[0] is 0x0. */
37 upad128_t *px = malloc(sizeof(*px));
38 x0 = px[0];
39
40 /* Uninitialised, but we know py[0] is 0x0. */
41 upad128_t *py = malloc(sizeof(*py));
42 y0 = py[0];
43
44 sa.sa_handler = sighandler;
45 sa.sa_flags = SA_SIGINFO;
46 if (sigfillset(&sa.sa_mask)) {
47 perror("sigfillset");
48 return 1;
49 }
50 if (sigaction(SIGUSR1, &sa, NULL)) {
51 perror("sigaction");
52 return 1;
53 }
54
55 pid = getpid();
56
57 __asm__ __volatile__(
58 /* Set values in the SSE registers. */
59 "movups %[y0], %%xmm0\n"
60 "movups %[d0], %%xmm1\n"
61 "movups %[d0], %%xmm2\n"
62 "movups %[y0], %%xmm3\n"
63 "movups %[y0], %%xmm4\n"
64 "movups %[d0], %%xmm5\n"
65 "movups %[d0], %%xmm6\n"
66 "movups %[y0], %%xmm7\n"
67
68 /* Trigger the signal handler. */
69 "syscall\n"
70 "movups %%xmm0, 0x00 + %[out]\n"
71 "movups %%xmm1, 0x10 + %[out]\n"
72 "movups %%xmm2, 0x20 + %[out]\n"
73 "movups %%xmm3, 0x30 + %[out]\n"
74 "movups %%xmm4, 0x40 + %[out]\n"
75 "movups %%xmm5, 0x50 + %[out]\n"
76 "movups %%xmm6, 0x60 + %[out]\n"
77 "movups %%xmm7, 0x70 + %[out]\n"
78 : [out] "=m" (out[0])
79 : "a" (SYS_kill), "D" (pid), "S" (SIGUSR1), [y0] "m" (y0), [d0] "m" (d0)
80 : "rdx", "cc", "memory");
81
82 printf("Values in the signal handler:\n");
83 printf(" xmm1=%Lf, xmm2=%Lf, xmm5=%Lf, xmm6=%Lf\n",
84 fs->xmm[1]._q, fs->xmm[2]._q, fs->xmm[5]._q, fs->xmm[6]._q);
85 /* Check that fs->xmm[0], fs->xmm[3], fs->xmm[4] and fs->xmm[7] contain
86 uninitialised values (origin is py[0]). */
87 if (fs->xmm[0]._q || fs->xmm[3]._q || fs->xmm[4]._q || fs->xmm[7]._q)
88 assert(0);
89
90 printf("Values after the return from the signal handler:\n");
91 printf(" xmm0=%Lf, xmm2=%Lf, xmm5=%Lf, xmm6=%Lf\n",
92 out[0]._q, out[2]._q, out[5]._q, out[6]._q);
93 /* Check that out[1], out[3], out[4] and out[7] contain uninitialised
94 values (origin is px[0]). */
95 if (out[1]._q || out[3]._q || out[4]._q || out[7]._q)
96 assert(0);
97
98 return 0;
99 }
100
101