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Respect length of watchpoints (Jan Kiszka)

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This adds length support for watchpoints. To keep things simple, only
aligned watchpoints are accepted.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5740 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-11-18 20:14:20 +00:00
parent db8886d3fd
commit b4051334d8
1 changed files with 20 additions and 10 deletions
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30
exec.c
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@ -1301,14 +1301,21 @@ static void breakpoint_invalidate(CPUState *env, target_ulong pc)
int cpu_watchpoint_insert(CPUState *env, target_ulong addr, target_ulong len,
int flags, CPUWatchpoint **watchpoint)
{
target_ulong len_mask = ~(len - 1);
CPUWatchpoint *wp;
/* sanity checks: allow power-of-2 lengths, deny unaligned watchpoints */
if ((len != 1 && len != 2 && len != 4 && len != 8) || (addr & ~len_mask)) {
fprintf(stderr, "qemu: tried to set invalid watchpoint at "
TARGET_FMT_lx ", len=" TARGET_FMT_lu "\n", addr, len);
return -EINVAL;
}
wp = qemu_malloc(sizeof(*wp));
if (!wp)
return -ENOBUFS;
wp->vaddr = addr;
wp->len_mask = 0;
wp->len_mask = len_mask;
wp->flags = flags;
wp->next = env->watchpoints;
@ -1332,10 +1339,12 @@ int cpu_watchpoint_insert(CPUState *env, target_ulong addr, target_ulong len,
int cpu_watchpoint_remove(CPUState *env, target_ulong addr, target_ulong len,
int flags)
{
target_ulong len_mask = ~(len - 1);
CPUWatchpoint *wp;
for (wp = env->watchpoints; wp != NULL; wp = wp->next) {
if (addr == wp->vaddr && flags == wp->flags) {
if (addr == wp->vaddr && len_mask == wp->len_mask
&& flags == wp->flags) {
cpu_watchpoint_remove_by_ref(env, wp);
return 0;
}
@ -2494,7 +2503,7 @@ static CPUWriteMemoryFunc *notdirty_mem_write[3] = {
};
/* Generate a debug exception if a watchpoint has been hit. */
static void check_watchpoint(int offset, int flags)
static void check_watchpoint(int offset, int len_mask, int flags)
{
CPUState *env = cpu_single_env;
target_ulong vaddr;
@ -2502,7 +2511,8 @@ static void check_watchpoint(int offset, int flags)
vaddr = (env->mem_io_vaddr & TARGET_PAGE_MASK) + offset;
for (wp = env->watchpoints; wp != NULL; wp = wp->next) {
if (vaddr == wp->vaddr && (wp->flags & flags)) {
if ((vaddr == (wp->vaddr & len_mask) ||
(vaddr & wp->len_mask) == wp->vaddr) && (wp->flags & flags)) {
env->watchpoint_hit = wp;
cpu_interrupt(env, CPU_INTERRUPT_DEBUG);
break;
@ -2515,40 +2525,40 @@ static void check_watchpoint(int offset, int flags)
phys routines. */
static uint32_t watch_mem_readb(void *opaque, target_phys_addr_t addr)
{
check_watchpoint(addr & ~TARGET_PAGE_MASK, BP_MEM_READ);
check_watchpoint(addr & ~TARGET_PAGE_MASK, ~0x0, BP_MEM_READ);
return ldub_phys(addr);
}
static uint32_t watch_mem_readw(void *opaque, target_phys_addr_t addr)
{
check_watchpoint(addr & ~TARGET_PAGE_MASK, BP_MEM_READ);
check_watchpoint(addr & ~TARGET_PAGE_MASK, ~0x1, BP_MEM_READ);
return lduw_phys(addr);
}
static uint32_t watch_mem_readl(void *opaque, target_phys_addr_t addr)
{
check_watchpoint(addr & ~TARGET_PAGE_MASK, BP_MEM_READ);
check_watchpoint(addr & ~TARGET_PAGE_MASK, ~0x3, BP_MEM_READ);
return ldl_phys(addr);
}
static void watch_mem_writeb(void *opaque, target_phys_addr_t addr,
uint32_t val)
{
check_watchpoint(addr & ~TARGET_PAGE_MASK, BP_MEM_WRITE);
check_watchpoint(addr & ~TARGET_PAGE_MASK, ~0x0, BP_MEM_WRITE);
stb_phys(addr, val);
}
static void watch_mem_writew(void *opaque, target_phys_addr_t addr,
uint32_t val)
{
check_watchpoint(addr & ~TARGET_PAGE_MASK, BP_MEM_WRITE);
check_watchpoint(addr & ~TARGET_PAGE_MASK, ~0x1, BP_MEM_WRITE);
stw_phys(addr, val);
}
static void watch_mem_writel(void *opaque, target_phys_addr_t addr,
uint32_t val)
{
check_watchpoint(addr & ~TARGET_PAGE_MASK, BP_MEM_WRITE);
check_watchpoint(addr & ~TARGET_PAGE_MASK, ~0x3, BP_MEM_WRITE);
stl_phys(addr, val);
}