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hw/slavio_intctl.c: fix gcc warning about array bounds overrun 

The Ubuntu 10.10 gcc for ARM complains that we might be overrunning
the cpu_irqs[][] array: silence this by correcting the bounds on the
loop. (In fact we would not have overrun the array because bit
MAX_PILS in pil_pending and irl_out will always be 0.)

Also add a comment about why the loop's lower bound is OK.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Peter Maydell 2011-01-31 10:42:26 +00:00 committed by Blue Swirl
parent 60f356e86d
commit c84a88d8cb
1 changed files with 6 additions and 1 deletions
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7
hw/slavio_intctl.c
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@ -289,7 +289,12 @@ static void slavio_check_interrupts(SLAVIO_INTCTLState *s, int set_irqs)
pil_pending |= (s->slaves[i].intreg_pending & CPU_SOFTIRQ_MASK) >> 16;
if (set_irqs) {
for (j = MAX_PILS; j > 0; j--) {
/* Since there is not really an interrupt 0 (and pil_pending
* and irl_out bit zero are thus always zero) there is no need
* to do anything with cpu_irqs[i][0] and it is OK not to do
* the j=0 iteration of this loop.
*/
for (j = MAX_PILS-1; j > 0; j--) {
if (pil_pending & (1 << j)) {
if (!(s->slaves[i].irl_out & (1 << j))) {
qemu_irq_raise(s->cpu_irqs[i][j]);