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hw/openrisc: Avoid undefined shift in openrisc_pic_cpu_handler() 

In C99 signed shift (1 << 31) is undefined behavior, since the result
exceeds INT_MAX.  Use 1U instead and move the shift after the check.

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Acked-by: Jia Liu <proljc@gmail.com>
This commit is contained in:
Jia Liu 2013-08-21 09:31:36 +08:00
parent ed396e2b2d
commit 7717f248ee
1 changed files with 3 additions and 1 deletions
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4
hw/openrisc/pic_cpu.c
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@ -26,12 +26,14 @@ static void openrisc_pic_cpu_handler(void *opaque, int irq, int level)
{ {
OpenRISCCPU *cpu = (OpenRISCCPU *)opaque; OpenRISCCPU *cpu = (OpenRISCCPU *)opaque;
CPUState *cs = CPU(cpu); CPUState *cs = CPU(cpu);
uint32_t irq_bit = 1 << irq; uint32_t irq_bit;
if (irq > 31 || irq < 0) { if (irq > 31 || irq < 0) {
return; return;
} }
irq_bit = 1U << irq;
if (level) { if (level) {
cpu->env.picsr |= irq_bit; cpu->env.picsr |= irq_bit;
} else { } else {