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target/sh4: Avoid shift into sign bit in update_itlb_use() 

In update_itlb_use() the variables or_mask and and_mask are uint8_t,
which means that in expressions like "and_mask << 24" the usual C
arithmetic conversions will result in the shift being done as a
signed int type, and so we will shift into the sign bit. For QEMU
this isn't undefined behaviour because we use -fwrapv; but we can
avoid it anyway by using uint32_t types for or_mask and and_mask.

Resolves: Coverity CID 1547628
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Message-id: 20240723172431.1757296-1-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2024-07-23 18:24:31 +01:00
parent bde8adb808
commit 525650cd71
1 changed files with 1 additions and 1 deletions
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2
target/sh4/helper.c
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@ -187,7 +187,7 @@ void superh_cpu_do_interrupt(CPUState *cs)
static void update_itlb_use(CPUSH4State * env, int itlbnb)
{
uint8_t or_mask = 0, and_mask = (uint8_t) - 1;
uint32_t or_mask = 0, and_mask = 0xff;
switch (itlbnb) {
case 0: