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target-arm: Implement checking of fired watchpoint 

ARM stops before access to a location covered by watchpoint. Also, QEMU
watchpoint fire is not necessarily an architectural watchpoint match.
Unfortunately, that is hardly possible to ignore a fired watchpoint in
debug exception handler. So move watchpoint check from debug exception
handler to the dedicated watchpoint checking callback.

Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1454256948-10485-3-git-send-email-serge.fdrv@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Sergey Fedorov 2016-02-11 11:17:32 +00:00 committed by Peter Maydell
parent 568496c0c0
commit 3826121d92
3 changed files with 25 additions and 14 deletions
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1
target-arm/cpu.c
View File

@ -1483,6 +1483,7 @@ static void arm_cpu_class_init(ObjectClass *oc, void *data)
cc->gdb_arch_name = arm_gdb_arch_name;
cc->gdb_stop_before_watchpoint = true;
cc->debug_excp_handler = arm_debug_excp_handler;
cc->debug_check_watchpoint = arm_debug_check_watchpoint;
cc->disas_set_info = arm_disas_set_info;

3
target-arm/internals.h
View File

@ -409,6 +409,9 @@ void hw_breakpoint_update(ARMCPU *cpu, int n);
*/
void hw_breakpoint_update_all(ARMCPU *cpu);
/* Callback function for checking if a watchpoint should trigger. */
bool arm_debug_check_watchpoint(CPUState *cs, CPUWatchpoint *wp);
/* Callback function for when a watchpoint or breakpoint triggers. */
void arm_debug_excp_handler(CPUState *cs);

17
target-arm/op_helper.c
View File

@ -976,6 +976,16 @@ void HELPER(check_breakpoints)(CPUARMState *env)
}
}
bool arm_debug_check_watchpoint(CPUState *cs, CPUWatchpoint *wp)
{
/* Called by core code when a CPU watchpoint fires; need to check if this
* is also an architectural watchpoint match.
*/
ARMCPU *cpu = ARM_CPU(cs);
return check_watchpoints(cpu);
}
void arm_debug_excp_handler(CPUState *cs)
{
/* Called by core code when a watchpoint or breakpoint fires;
@ -987,11 +997,11 @@ void arm_debug_excp_handler(CPUState *cs)
if (wp_hit) {
if (wp_hit->flags & BP_CPU) {
cs->watchpoint_hit = NULL;
if (check_watchpoints(cpu)) {
bool wnr = (wp_hit->flags & BP_WATCHPOINT_HIT_WRITE) != 0;
bool same_el = arm_debug_target_el(env) == arm_current_el(env);
cs->watchpoint_hit = NULL;
if (extended_addresses_enabled(env)) {
env->exception.fsr = (1 << 9) | 0x22;
} else {
@ -1001,9 +1011,6 @@ void arm_debug_excp_handler(CPUState *cs)
raise_exception(env, EXCP_DATA_ABORT,
syn_watchpoint(same_el, 0, wnr),
arm_debug_target_el(env));
} else {
cpu_resume_from_signal(cs, NULL);
}
}
} else {
uint64_t pc = is_a64(env) ? env->pc : env->regs[15];