qemu

FORK: QEMU emulator
git clone https://git.neptards.moe/neptards/qemu.git
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trap.c (2376B)

      1 /*
      2  * Copyright 2021 IBM Corp.
      3  *
      4  * This work is licensed under the terms of the GNU GPL, version 2 or (at
      5  * your option) any later version. See the COPYING file in the top-level
      6  * directory.
      7  */
      8 
      9 #include <stdarg.h>
     10 #include <stdint.h>
     11 #include <stdio.h>
     12 #include <stdlib.h>
     13 #include <unistd.h>
     14 #include <errno.h>
     15 #include <string.h>
     16 #include <signal.h>
     17 
     18 static void error1(const char *filename, int line, const char *fmt, ...)
     19 {
     20     va_list ap;
     21     va_start(ap, fmt);
     22     fprintf(stderr, "%s:%d: ", filename, line);
     23     vfprintf(stderr, fmt, ap);
     24     fprintf(stderr, "\n");
     25     va_end(ap);
     26     exit(1);
     27 }
     28 
     29 static int __chk_error(const char *filename, int line, int ret)
     30 {
     31     if (ret < 0) {
     32         error1(filename, line, "%m (ret=%d, errno=%d/%s)",
     33                ret, errno, strerror(errno));
     34     }
     35     return ret;
     36 }
     37 
     38 #define error(fmt, ...) error1(__FILE__, __LINE__, fmt, ## __VA_ARGS__)
     39 
     40 #define chk_error(ret) __chk_error(__FILE__, __LINE__, (ret))
     41 
     42 int sigfpe_count;
     43 int sigill_count;
     44 
     45 static void sig_handler(int sig, siginfo_t *si, void *puc)
     46 {
     47     if (sig == SIGFPE) {
     48         if (si->si_code != 0) {
     49             error("unexpected si_code: 0x%x != 0", si->si_code);
     50         }
     51         ++sigfpe_count;
     52         return;
     53     }
     54 
     55     if (sig == SIGILL) {
     56         ++sigill_count;
     57         return;
     58     }
     59 
     60     error("unexpected signal 0x%x\n", sig);
     61 }
     62 
     63 int main(int argc, char **argv)
     64 {
     65     sigfpe_count = sigill_count = 0;
     66 
     67     struct sigaction act;
     68 
     69     /* Set up SIG handler */
     70     act.sa_sigaction = sig_handler;
     71     sigemptyset(&act.sa_mask);
     72     act.sa_flags = SA_SIGINFO;
     73     chk_error(sigaction(SIGFPE, &act, NULL));
     74     chk_error(sigaction(SIGILL, &act, NULL));
     75 
     76     uint64_t z = 0x0ull;
     77     uint64_t lz = 0xffffffffffffffffull;
     78     asm volatile (
     79         "lg %%r13,%[lz]\n"
     80         "cgitne %%r13,0\n" /* SIGFPE */
     81         "lg %%r13,%[z]\n"
     82         "cgitne %%r13,0\n" /* no trap */
     83         "nopr\n"
     84         "lg %%r13,%[lz]\n"
     85         "citne %%r13,0\n" /* SIGFPE */
     86         "lg %%r13,%[z]\n"
     87         "citne %%r13,0\n" /* no trap */
     88         "nopr\n"
     89         :
     90         : [z] "m" (z), [lz] "m" (lz)
     91         : "memory", "r13");
     92 
     93     if (sigfpe_count != 2) {
     94         error("unexpected SIGFPE count: %d != 2", sigfpe_count);
     95     }
     96     if (sigill_count != 0) {
     97         error("unexpected SIGILL count: %d != 0", sigill_count);
     98     }
     99 
    100     printf("PASS\n");
    101     return 0;
    102 }