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exec: Factor out core logic of check_watchpoint() 

We want to perform the same checks in probe_write() to trigger a cpu
exit before doing any modifications. We'll have to pass a PC.

Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20190823100741.9621-9-david@redhat.com>
[rth: Use vaddr for len, like other watchpoint functions;
Move user-only stub to static inline.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
David Hildenbrand 2019-08-23 12:07:40 +02:00 committed by Richard Henderson
parent 74841f044e
commit 0026348b48
2 changed files with 25 additions and 8 deletions
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26
exec.c
View File

@ -2789,11 +2789,10 @@ static const MemoryRegionOps notdirty_mem_ops = {
};
/* Generate a debug exception if a watchpoint has been hit. */
static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags)
void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
MemTxAttrs attrs, int flags, uintptr_t ra)
{
CPUState *cpu = current_cpu;
CPUClass *cc = CPU_GET_CLASS(cpu);
target_ulong vaddr;
CPUWatchpoint *wp;
assert(tcg_enabled());
@ -2804,17 +2803,17 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags)
cpu_interrupt(cpu, CPU_INTERRUPT_DEBUG);
return;
}
vaddr = (cpu->mem_io_vaddr & TARGET_PAGE_MASK) + offset;
vaddr = cc->adjust_watchpoint_address(cpu, vaddr, len);
addr = cc->adjust_watchpoint_address(cpu, addr, len);
QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
if (cpu_watchpoint_address_matches(wp, vaddr, len)
if (cpu_watchpoint_address_matches(wp, addr, len)
&& (wp->flags & flags)) {
if (flags == BP_MEM_READ) {
wp->flags |= BP_WATCHPOINT_HIT_READ;
} else {
wp->flags |= BP_WATCHPOINT_HIT_WRITE;
}
wp->hitaddr = vaddr;
wp->hitaddr = MAX(addr, wp->vaddr);
wp->hitattrs = attrs;
if (!cpu->watchpoint_hit) {
if (wp->flags & BP_CPU &&
@ -2829,11 +2828,14 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags)
if (wp->flags & BP_STOP_BEFORE_ACCESS) {
cpu->exception_index = EXCP_DEBUG;
mmap_unlock();
cpu_loop_exit(cpu);
cpu_loop_exit_restore(cpu, ra);
} else {
/* Force execution of one insn next time. */
cpu->cflags_next_tb = 1 | curr_cflags();
mmap_unlock();
if (ra) {
cpu_restore_state(cpu, ra, true);
}
cpu_loop_exit_noexc(cpu);
}
}
@ -2843,6 +2845,14 @@ static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags)
}
}
static void check_watchpoint(int offset, int len, MemTxAttrs attrs, int flags)
{
CPUState *cpu = current_cpu;
vaddr addr = (cpu->mem_io_vaddr & TARGET_PAGE_MASK) + offset;
cpu_check_watchpoint(cpu, addr, len, attrs, flags, 0);
}
/* Watchpoint access routines. Watchpoints are inserted using TLB tricks,
so these check for a hit then pass through to the normal out-of-line
phys routines. */

7
include/hw/core/cpu.h
View File

@ -1091,6 +1091,11 @@ static inline void cpu_watchpoint_remove_by_ref(CPUState *cpu,
static inline void cpu_watchpoint_remove_all(CPUState *cpu, int mask)
{
}
static inline void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
MemTxAttrs atr, int fl, uintptr_t ra)
{
}
#else
int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len,
int flags, CPUWatchpoint **watchpoint);
@ -1098,6 +1103,8 @@ int cpu_watchpoint_remove(CPUState *cpu, vaddr addr,
vaddr len, int flags);
void cpu_watchpoint_remove_by_ref(CPUState *cpu, CPUWatchpoint *watchpoint);
void cpu_watchpoint_remove_all(CPUState *cpu, int mask);
void cpu_check_watchpoint(CPUState *cpu, vaddr addr, vaddr len,
MemTxAttrs attrs, int flags, uintptr_t ra);
#endif
/**