mirror of
https://github.com/ioacademy-jikim/debugging
synced 2025-06-08 08:26:14 +00:00
107 lines
3.0 KiB
C
107 lines
3.0 KiB
C
/* x86 variant of the amd64-solaris/context_sse.c test. */
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#include <assert.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/ucontext.h>
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static siginfo_t si;
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static ucontext_t uc;
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/* x0 is always zero, but is visible to Valgrind as uninitialised. */
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static upad128_t x0;
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static upad128_t d0 = {0};
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static void sighandler(int sig, siginfo_t *sip, ucontext_t *ucp)
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{
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si = *sip;
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uc = *ucp;
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ucp->uc_mcontext.fpregs.fp_reg_set.fpchip_state.xmm[0] = d0;
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ucp->uc_mcontext.fpregs.fp_reg_set.fpchip_state.xmm[1] = x0;
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}
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int main(void)
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{
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struct sigaction sa;
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pid_t pid;
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upad128_t out[8];
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upad128_t y0;
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struct fpchip_state *fs = &uc.uc_mcontext.fpregs.fp_reg_set.fpchip_state;
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/* Uninitialised, but we know px[0] is 0x0. */
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upad128_t *px = malloc(sizeof(*px));
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x0 = px[0];
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/* Uninitialised, but we know py[0] is 0x0. */
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upad128_t *py = malloc(sizeof(*py));
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y0 = py[0];
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sa.sa_handler = sighandler;
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sa.sa_flags = SA_SIGINFO;
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if (sigfillset(&sa.sa_mask)) {
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perror("sigfillset");
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return 1;
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}
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if (sigaction(SIGUSR1, &sa, NULL)) {
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perror("sigaction");
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return 1;
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}
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pid = getpid();
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__asm__ __volatile__(
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/* Set values in the SSE registers. */
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"movups %[y0], %%xmm0\n"
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"movups %[d0], %%xmm1\n"
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"movups %[d0], %%xmm2\n"
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"movups %[y0], %%xmm3\n"
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"movups %[y0], %%xmm4\n"
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"movups %[d0], %%xmm5\n"
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"movups %[d0], %%xmm6\n"
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"movups %[y0], %%xmm7\n"
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/* Prepare syscall parameters. */
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"pushl %[sig]\n"
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"pushl %[pid]\n"
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"pushl $0xdeadbeef\n"
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"movl %[scall], %%eax\n"
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/* Trigger the signal handler. */
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"int $0x91\n"
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"addl $12, %%esp\n"
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"movups %%xmm0, 0x00 + %[out]\n"
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"movups %%xmm1, 0x10 + %[out]\n"
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"movups %%xmm2, 0x20 + %[out]\n"
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"movups %%xmm3, 0x30 + %[out]\n"
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"movups %%xmm4, 0x40 + %[out]\n"
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"movups %%xmm5, 0x50 + %[out]\n"
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"movups %%xmm6, 0x60 + %[out]\n"
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"movups %%xmm7, 0x70 + %[out]\n"
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: [out] "=m" (out[0])
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: [scall] "i" (SYS_kill), [pid] "a" (pid), [sig] "i" (SIGUSR1),
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[y0] "m" (y0), [d0] "m" (d0)
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: "edx", "cc", "memory");
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printf("Values in the signal handler:\n");
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printf(" xmm1=%Lf, xmm2=%Lf, xmm5=%Lf, xmm6=%Lf\n",
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fs->xmm[1]._q, fs->xmm[2]._q, fs->xmm[5]._q, fs->xmm[6]._q);
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/* Check that fs->xmm[0], fs->xmm[3], fs->xmm[4] and fs->xmm[7] contain
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uninitialised values (origin is py[0]). */
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if (fs->xmm[0]._q || fs->xmm[3]._q || fs->xmm[4]._q || fs->xmm[7]._q)
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assert(0);
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printf("Values after the return from the signal handler:\n");
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printf(" xmm0=%Lf, xmm2=%Lf, xmm5=%Lf, xmm6=%Lf\n",
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out[0]._q, out[2]._q, out[5]._q, out[6]._q);
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/* Check that out[1], out[3], out[4] and out[7] contain uninitialised
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values (origin is px[0]). */
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if (out[1]._q || out[3]._q || out[4]._q || out[7]._q)
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assert(0);
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return 0;
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}
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