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tests/tcg: better detect truncated reads 

If we've truncated a wider read we can detect the condition earlier by
looking at the number of zeros we've read. So we don't trip up on
cases where we have written zeros to the start of the buffer we also
ensure we only start each offset read from the right address.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2019-06-03 16:14:24 +01:00
parent 8c79b28851
commit fcf112317c
1 changed files with 31 additions and 5 deletions
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36
tests/tcg/multiarch/system/memory.c
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@ -208,6 +208,7 @@ static bool read_test_data_u32(int offset)
for (i = 0; i < max; i++) {
uint8_t b1, b2, b3, b4;
int zeros = 0;
word = *ptr++;
b1 = word >> 24 & 0xff;
@ -215,6 +216,16 @@ static bool read_test_data_u32(int offset)
b3 = word >> 8 & 0xff;
b4 = word & 0xff;
zeros += (b1 == 0 ? 1 : 0);
zeros += (b2 == 0 ? 1 : 0);
zeros += (b3 == 0 ? 1 : 0);
zeros += (b4 == 0 ? 1 : 0);
if (zeros > 1) {
ml_printf("Error @ %p, more zeros than expected: %d, %d, %d, %d",
ptr - 1, b1, b2, b3, b4);
return false;
}
if ((b1 < b2 && b1 != 0) ||
(b2 < b3 && b2 != 0) ||
(b3 < b4 && b3 != 0)) {
@ -238,6 +249,7 @@ static bool read_test_data_u64(int offset)
for (i = 0; i < max; i++) {
uint8_t b1, b2, b3, b4, b5, b6, b7, b8;
int zeros = 0;
word = *ptr++;
b1 = ((uint64_t) (word >> 56)) & 0xff;
@ -249,6 +261,20 @@ static bool read_test_data_u64(int offset)
b7 = (word >> 8) & 0xff;
b8 = (word >> 0) & 0xff;
zeros += (b1 == 0 ? 1 : 0);
zeros += (b2 == 0 ? 1 : 0);
zeros += (b3 == 0 ? 1 : 0);
zeros += (b4 == 0 ? 1 : 0);
zeros += (b5 == 0 ? 1 : 0);
zeros += (b6 == 0 ? 1 : 0);
zeros += (b7 == 0 ? 1 : 0);
zeros += (b8 == 0 ? 1 : 0);
if (zeros > 1) {
ml_printf("Error @ %p, more zeros than expected: %d, %d, %d, %d, %d, %d, %d, %d",
ptr - 1, b1, b2, b3, b4, b5, b6, b7, b8);
return false;
}
if ((b1 < b2 && b1 != 0) ||
(b2 < b3 && b2 != 0) ||
(b3 < b4 && b3 != 0) ||
@ -272,7 +298,7 @@ read_ufn read_ufns[] = { read_test_data_u16,
read_test_data_u32,
read_test_data_u64 };
bool do_unsigned_reads(void)
bool do_unsigned_reads(int start_off)
{
int i;
bool ok = true;
@ -280,11 +306,11 @@ bool do_unsigned_reads(void)
for (i = 0; i < ARRAY_SIZE(read_ufns) && ok; i++) {
#if CHECK_UNALIGNED
int off;
for (off = 0; off < 8 && ok; off++) {
for (off = start_off; off < 8 && ok; off++) {
ok = read_ufns[i](off);
}
#else
ok = read_ufns[i](0);
ok = read_ufns[i](start_off);
#endif
}
@ -298,11 +324,11 @@ static bool do_unsigned_test(init_ufn fn)
int i;
for (i = 0; i < 8 && ok; i++) {
fn(i);
ok = do_unsigned_reads();
ok = do_unsigned_reads(i);
}
#else
fn(0);
return do_unsigned_reads();
return do_unsigned_reads(0);
#endif
}