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A bit optimization for tlb_set_page()

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This patch avoids handling write watchpoints on read-only memory access.
It also breaks the searching loop for watchpoint once the setup for
handling watchpoint later is done.

Signed-off-by: Jun Koi <junkoi2004@gmail.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Jun Koi 2010-05-06 14:36:59 +09:00 committed by Aurelien Jarno
parent 6fbab86925
commit bf298f83c3
1 changed files with 6 additions and 4 deletions
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10
exec.c
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@ -2209,10 +2209,12 @@ void tlb_set_page(CPUState *env, target_ulong vaddr,
watchpoint trap routines. */
QTAILQ_FOREACH(wp, &env->watchpoints, entry) {
if (vaddr == (wp->vaddr & TARGET_PAGE_MASK)) {
iotlb = io_mem_watch + paddr;
/* TODO: The memory case can be optimized by not trapping
reads of pages with a write breakpoint. */
address |= TLB_MMIO;
/* Avoid trapping reads of pages with a write breakpoint. */
if ((prot & PAGE_WRITE) || (wp->flags & BP_MEM_READ)) {
iotlb = io_mem_watch + paddr;
address |= TLB_MMIO;
break;
}
}
}