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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <sys/mman.h>
#include "utils.h"
extern char __start___ex_table[];
extern char __stop___ex_table[];
#if defined(__powerpc64__)
#define UCONTEXT_NIA(UC) (UC)->uc_mcontext.gp_regs[PT_NIP]
#elif defined(__powerpc__)
#define UCONTEXT_NIA(UC) (UC)->uc_mcontext.uc_regs->gregs[PT_NIP]
#else
#error implement UCONTEXT_NIA
#endif
static void segv_handler(int signr, siginfo_t *info, void *ptr)
{
ucontext_t *uc = (ucontext_t *)ptr;
unsigned long addr = (unsigned long)info->si_addr;
unsigned long *ip = &UCONTEXT_NIA(uc);
unsigned long *ex_p = (unsigned long *)__start___ex_table;
while (ex_p < (unsigned long *)__stop___ex_table) {
unsigned long insn, fixup;
insn = *ex_p++;
fixup = *ex_p++;
if (insn == *ip) {
*ip = fixup;
return;
}
}
printf("No exception table match for NIA %lx ADDR %lx\n", *ip, addr);
abort();
}
static void setup_segv_handler(void)
{
struct sigaction action;
memset(&action, 0, sizeof(action));
action.sa_sigaction = segv_handler;
action.sa_flags = SA_SIGINFO;
sigaction(SIGSEGV, &action, NULL);
}
unsigned long COPY_LOOP(void *to, const void *from, unsigned long size);
unsigned long test_copy_tofrom_user_reference(void *to, const void *from, unsigned long size);
static int total_passed;
static int total_failed;
static void do_one_test(char *dstp, char *srcp, unsigned long len)
{
unsigned long got, expected;
got = COPY_LOOP(dstp, srcp, len);
expected = test_copy_tofrom_user_reference(dstp, srcp, len);
if (got != expected) {
total_failed++;
printf("FAIL from=%p to=%p len=%ld returned %ld, expected %ld\n",
srcp, dstp, len, got, expected);
//abort();
} else
total_passed++;
}
//#define MAX_LEN 512
#define MAX_LEN 16
int test_copy_exception(void)
{
int page_size;
static char *p, *q;
unsigned long src, dst, len;
page_size = getpagesize();
p = mmap(NULL, page_size * 2, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
if (p == MAP_FAILED) {
perror("mmap");
exit(1);
}
memset(p, 0, page_size);
setup_segv_handler();
if (mprotect(p + page_size, page_size, PROT_NONE)) {
perror("mprotect");
exit(1);
}
q = p + page_size - MAX_LEN;
for (src = 0; src < MAX_LEN; src++) {
for (dst = 0; dst < MAX_LEN; dst++) {
for (len = 0; len < MAX_LEN+1; len++) {
// printf("from=%p to=%p len=%ld\n", q+dst, q+src, len);
do_one_test(q+dst, q+src, len);
}
}
}
printf("Totals:\n");
printf(" Pass: %d\n", total_passed);
printf(" Fail: %d\n", total_failed);
return 0;
}
int main(void)
{
return test_harness(test_copy_exception, str(COPY_LOOP));
}
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