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target-alpha: Avoid leaking the alarm timer over reset 

Move the timer from CPUAlphaState to AlphaCPU to avoid the pointer being
zero'ed once we implement reset. Would cause a segfault in
sys_helper.c:helper_set_alarm().

This also simplifies timer initialization in Typhoon.

Signed-off-by: Andreas Färber <afaerber@suse.de>
Acked-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Andreas Färber 2012-10-31 02:41:11 +01:00
parent ad6011775a
commit c92458538f
4 changed files with 8 additions and 5 deletions
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3
hw/alpha_typhoon.c
View File

@ -724,8 +724,7 @@ PCIBus *typhoon_init(ram_addr_t ram_size, ISABus **isa_bus,
AlphaCPU *cpu = cpus[i];
s->cchip.cpu[i] = cpu;
if (cpu != NULL) {
CPUAlphaState *env = &cpu->env;
env->alarm_timer = qemu_new_timer_ns(rtc_clock,
cpu->alarm_timer = qemu_new_timer_ns(rtc_clock,
typhoon_alarm_timer,
(void *)((uintptr_t)s + i));
}

3
target-alpha/cpu-qom.h
View File

@ -58,6 +58,9 @@ typedef struct AlphaCPU {
/*< public >*/
CPUAlphaState env;
/* This alarm doesn't exist in real hardware; we wish it did. */
struct QEMUTimer *alarm_timer;
} AlphaCPU;
static inline AlphaCPU *alpha_env_get_cpu(CPUAlphaState *env)

1
target-alpha/cpu.h
View File

@ -277,7 +277,6 @@ struct CPUAlphaState {
#endif
/* This alarm doesn't exist in real hardware; we wish it did. */
struct QEMUTimer *alarm_timer;
uint64_t alarm_expire;
/* Those resources are used only in QEMU core */

6
target-alpha/sys_helper.c
View File

@ -77,11 +77,13 @@ uint64_t helper_get_time(void)
void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
{
AlphaCPU *cpu = alpha_env_get_cpu(env);
if (expire) {
env->alarm_expire = expire;
qemu_mod_timer(env->alarm_timer, expire);
qemu_mod_timer(cpu->alarm_timer, expire);
} else {
qemu_del_timer(env->alarm_timer);
qemu_del_timer(cpu->alarm_timer);
}
}
#endif /* CONFIG_USER_ONLY */