LXR linux/tools/testing/selftests/powerpc/copyloops/exc

   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
  10extern char __start___ex_table[];
  11extern 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
  21static 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
  44static 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
  54unsigned long COPY_LOOP(void *to, const void *from, unsigned long size);
  55unsigned long test_copy_tofrom_user_reference(void *to, const void *from, unsigned long size);
  56
  57static int total_passed;
  58static int total_failed;
  59
  60static 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
  79int 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
 121int main(void)
 122{
 123        return test_harness(test_copy_exception, str(COPY_LOOP));
 124}
 125