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powerpc/watchpoint: Add DAR outside test in perf-hwbreak.c selftest 

So far we used to ignore exception if DAR points outside of user
specified range. But now we are ignoring it only if actual load/store
range does not overlap with user specified range. Include selftests
for the same:

  # ./tools/testing/selftests/powerpc/ptrace/perf-hwbreak
  ...
  TESTED: No overlap
  TESTED: Partial overlap
  TESTED: Partial overlap
  TESTED: No overlap
  TESTED: Full overlap
  success: perf_hwbreak

Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191017093204.7511-7-ravi.bangoria@linux.ibm.com
This commit is contained in:
Ravi Bangoria 2019-10-17 15:02:03 +05:30 committed by Michael Ellerman
parent c2837acfbf
commit 949758a2f4
1 changed files with 118 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

119
tools/testing/selftests/powerpc/ptrace/perf-hwbreak.c
View File

@ -148,6 +148,121 @@ static int runtestsingle(int readwriteflag, int exclude_user, int arraytest)
return 0;
}
static int runtest_dar_outside(void)
{
void *target;
volatile __u16 temp16;
volatile __u64 temp64;
struct perf_event_attr attr;
int break_fd;
unsigned long long breaks;
int fail = 0;
size_t res;
target = malloc(8);
if (!target) {
perror("malloc failed");
exit(EXIT_FAILURE);
}
/* setup counters */
memset(&attr, 0, sizeof(attr));
attr.disabled = 1;
attr.type = PERF_TYPE_BREAKPOINT;
attr.exclude_kernel = 1;
attr.exclude_hv = 1;
attr.exclude_guest = 1;
attr.bp_type = HW_BREAKPOINT_RW;
/* watch middle half of target array */
attr.bp_addr = (__u64)(target + 2);
attr.bp_len = 4;
break_fd = sys_perf_event_open(&attr, 0, -1, -1, 0);
if (break_fd < 0) {
free(target);
perror("sys_perf_event_open");
exit(EXIT_FAILURE);
}
/* Shouldn't hit. */
ioctl(break_fd, PERF_EVENT_IOC_RESET);
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
temp16 = *((__u16 *)target);
*((__u16 *)target) = temp16;
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
if (breaks == 0) {
printf("TESTED: No overlap\n");
} else {
printf("FAILED: No overlap: %lld != 0\n", breaks);
fail = 1;
}
/* Hit */
ioctl(break_fd, PERF_EVENT_IOC_RESET);
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
temp16 = *((__u16 *)(target + 1));
*((__u16 *)(target + 1)) = temp16;
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
if (breaks == 2) {
printf("TESTED: Partial overlap\n");
} else {
printf("FAILED: Partial overlap: %lld != 2\n", breaks);
fail = 1;
}
/* Hit */
ioctl(break_fd, PERF_EVENT_IOC_RESET);
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
temp16 = *((__u16 *)(target + 5));
*((__u16 *)(target + 5)) = temp16;
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
if (breaks == 2) {
printf("TESTED: Partial overlap\n");
} else {
printf("FAILED: Partial overlap: %lld != 2\n", breaks);
fail = 1;
}
/* Shouldn't Hit */
ioctl(break_fd, PERF_EVENT_IOC_RESET);
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
temp16 = *((__u16 *)(target + 6));
*((__u16 *)(target + 6)) = temp16;
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
if (breaks == 0) {
printf("TESTED: No overlap\n");
} else {
printf("FAILED: No overlap: %lld != 0\n", breaks);
fail = 1;
}
/* Hit */
ioctl(break_fd, PERF_EVENT_IOC_RESET);
ioctl(break_fd, PERF_EVENT_IOC_ENABLE);
temp64 = *((__u64 *)target);
*((__u64 *)target) = temp64;
ioctl(break_fd, PERF_EVENT_IOC_DISABLE);
res = read(break_fd, &breaks, sizeof(unsigned long long));
assert(res == sizeof(unsigned long long));
if (breaks == 2) {
printf("TESTED: Full overlap\n");
} else {
printf("FAILED: Full overlap: %lld != 2\n", breaks);
fail = 1;
}
free(target);
close(break_fd);
return fail;
}
static int runtest(void)
{
int rwflag;
@ -172,7 +287,9 @@ static int runtest(void)
return ret;
}
}
return 0;
ret = runtest_dar_outside();
return ret;
}