Comments
Patch
@@ -26,12 +26,14 @@ static void openrisc_pic_cpu_handler(void *opaque, int irq, int level)
{
OpenRISCCPU *cpu = (OpenRISCCPU *)opaque;
int i;
- uint32_t irq_bit = 1 << irq;
+ uint32_t irq_bit;
if (irq > 31 || irq < 0) {
return;
}
+ irq_bit = 1U << irq;
+
if (level) {
cpu->env.picsr |= irq_bit;
} else {
@@ -39,11 +41,11 @@ static void openrisc_pic_cpu_handler(void *opaque, int irq, int level)
}
for (i = 0; i < 32; i++) {
- if ((cpu->env.picsr && (1 << i)) && (cpu->env.picmr && (1 << i))) {
+ if ((cpu->env.picsr & (1U << i)) && (cpu->env.picmr & (1U << i))) {
cpu_interrupt(&cpu->env, CPU_INTERRUPT_HARD);
} else {
cpu_reset_interrupt(&cpu->env, CPU_INTERRUPT_HARD);
- cpu->env.picsr &= ~(1 << i);
+ cpu->env.picsr &= ~(1U << i);
}
}
}
A correct mask should be `x & (1 << i)', rather than `x && (1 << i)'. Also, in C99 signed shift (1 << 31) is undefined behavior, since the result exceeds INT_MAX; use 1U instead. Signed-off-by: Xi Wang <xi.wang@gmail.com> --- hw/openrisc_pic.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)