root/tools/testing/selftests/powerpc/copyloops/exc_validate.c

DEFINITIONS

1. segv_handler
2. setup_segv_handler
3. do_one_test
4. test_copy_exception
5. main

   1 #include <stdlib.h>
   2 #include <string.h>
   3 #include <stdio.h>
   4 #include <signal.h>
   5 #include <unistd.h>
   6 #include <sys/mman.h>
   7 
   8 #include "utils.h"
   9 
  10 extern char __start___ex_table[];
  11 extern char __stop___ex_table[];
  12 
  13 #if defined(__powerpc64__)
  14 #define UCONTEXT_NIA(UC)        (UC)->uc_mcontext.gp_regs[PT_NIP]
  15 #elif defined(__powerpc__)
  16 #define UCONTEXT_NIA(UC)        (UC)->uc_mcontext.uc_regs->gregs[PT_NIP]
  17 #else
  18 #error implement UCONTEXT_NIA
  19 #endif
  20 
  21 static void segv_handler(int signr, siginfo_t *info, void *ptr)
  22 {
  23         ucontext_t *uc = (ucontext_t *)ptr;
  24         unsigned long addr = (unsigned long)info->si_addr;
  25         unsigned long *ip = &UCONTEXT_NIA(uc);
  26         unsigned long *ex_p = (unsigned long *)__start___ex_table;
  27 
  28         while (ex_p < (unsigned long *)__stop___ex_table) {
  29                 unsigned long insn, fixup;
  30 
  31                 insn = *ex_p++;
  32                 fixup = *ex_p++;
  33 
  34                 if (insn == *ip) {
  35                         *ip = fixup;
  36                         return;
  37                 }
  38         }
  39 
  40         printf("No exception table match for NIA %lx ADDR %lx\n", *ip, addr);
  41         abort();
  42 }
  43 
  44 static void setup_segv_handler(void)
  45 {
  46         struct sigaction action;
  47 
  48         memset(&action, 0, sizeof(action));
  49         action.sa_sigaction = segv_handler;
  50         action.sa_flags = SA_SIGINFO;
  51         sigaction(SIGSEGV, &action, NULL);
  52 }
  53 
  54 unsigned long COPY_LOOP(void *to, const void *from, unsigned long size);
  55 unsigned long test_copy_tofrom_user_reference(void *to, const void *from, unsigned long size);
  56 
  57 static int total_passed;
  58 static int total_failed;
  59 
  60 static void do_one_test(char *dstp, char *srcp, unsigned long len)
  61 {
  62         unsigned long got, expected;
  63 
  64         got = COPY_LOOP(dstp, srcp, len);
  65         expected = test_copy_tofrom_user_reference(dstp, srcp, len);
  66 
  67         if (got != expected) {
  68                 total_failed++;
  69                 printf("FAIL from=%p to=%p len=%ld returned %ld, expected %ld\n",
  70                        srcp, dstp, len, got, expected);
  71                 //abort();
  72         } else
  73                 total_passed++;
  74 }
  75 
  76 //#define MAX_LEN 512
  77 #define MAX_LEN 16
  78 
  79 int test_copy_exception(void)
  80 {
  81         int page_size;
  82         static char *p, *q;
  83         unsigned long src, dst, len;
  84 
  85         page_size = getpagesize();
  86         p = mmap(NULL, page_size * 2, PROT_READ|PROT_WRITE,
  87                 MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
  88 
  89         if (p == MAP_FAILED) {
  90                 perror("mmap");
  91                 exit(1);
  92         }
  93 
  94         memset(p, 0, page_size);
  95 
  96         setup_segv_handler();
  97 
  98         if (mprotect(p + page_size, page_size, PROT_NONE)) {
  99                 perror("mprotect");
 100                 exit(1);
 101         }
 102 
 103         q = p + page_size - MAX_LEN;
 104 
 105         for (src = 0; src < MAX_LEN; src++) {
 106                 for (dst = 0; dst < MAX_LEN; dst++) {
 107                         for (len = 0; len < MAX_LEN+1; len++) {
 108                                 // printf("from=%p to=%p len=%ld\n", q+dst, q+src, len);
 109                                 do_one_test(q+dst, q+src, len);
 110                         }
 111                 }
 112         }
 113 
 114         printf("Totals:\n");
 115         printf("  Pass: %d\n", total_passed);
 116         printf("  Fail: %d\n", total_failed);
 117 
 118         return 0;
 119 }
 120 
 121 int main(void)
 122 {
 123         return test_harness(test_copy_exception, str(COPY_LOOP));
 124 }