From 194cbc492bcc8f3f1868ec97a35146bc99c3c71c Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Wed, 12 Oct 2016 18:54:34 +0100 Subject: target-arm: Add trace events for the generic timers Add some useful trace events for the ARM generic timers (notably the various register writes and the resulting IRQ line state). Signed-off-by: Peter Maydell Reviewed-by: Edgar E. Iglesias Message-id: 1476294876-12340-3-git-send-email-peter.maydell@linaro.org --- target-arm/helper.c | 20 ++++++++++++++++---- target-arm/trace-events | 10 ++++++++++ 2 files changed, 26 insertions(+), 4 deletions(-) create mode 100644 target-arm/trace-events (limited to 'target-arm') diff --git a/target-arm/helper.c b/target-arm/helper.c index a65f4f2f1f..cb83ee2008 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -1,4 +1,5 @@ #include "qemu/osdep.h" +#include "trace.h" #include "cpu.h" #include "internals.h" #include "exec/gdbstub.h" @@ -1560,10 +1561,13 @@ static void gt_recalc_timer(ARMCPU *cpu, int timeridx) /* Note that this must be unsigned 64 bit arithmetic: */ int istatus = count - offset >= gt->cval; uint64_t nexttick; + int irqstate; gt->ctl = deposit32(gt->ctl, 2, 1, istatus); - qemu_set_irq(cpu->gt_timer_outputs[timeridx], - (istatus && !(gt->ctl & 2))); + + irqstate = (istatus && !(gt->ctl & 2)); + qemu_set_irq(cpu->gt_timer_outputs[timeridx], irqstate); + if (istatus) { /* Next transition is when count rolls back over to zero */ nexttick = UINT64_MAX; @@ -1580,11 +1584,13 @@ static void gt_recalc_timer(ARMCPU *cpu, int timeridx) nexttick = INT64_MAX / GTIMER_SCALE; } timer_mod(cpu->gt_timer[timeridx], nexttick); + trace_arm_gt_recalc(timeridx, irqstate, nexttick); } else { /* Timer disabled: ISTATUS and timer output always clear */ gt->ctl &= ~4; qemu_set_irq(cpu->gt_timer_outputs[timeridx], 0); timer_del(cpu->gt_timer[timeridx]); + trace_arm_gt_recalc_disabled(timeridx); } } @@ -1610,6 +1616,7 @@ static void gt_cval_write(CPUARMState *env, const ARMCPRegInfo *ri, int timeridx, uint64_t value) { + trace_arm_gt_cval_write(timeridx, value); env->cp15.c14_timer[timeridx].cval = value; gt_recalc_timer(arm_env_get_cpu(env), timeridx); } @@ -1629,6 +1636,7 @@ static void gt_tval_write(CPUARMState *env, const ARMCPRegInfo *ri, { uint64_t offset = timeridx == GTIMER_VIRT ? env->cp15.cntvoff_el2 : 0; + trace_arm_gt_tval_write(timeridx, value); env->cp15.c14_timer[timeridx].cval = gt_get_countervalue(env) - offset + sextract64(value, 0, 32); gt_recalc_timer(arm_env_get_cpu(env), timeridx); @@ -1641,6 +1649,7 @@ static void gt_ctl_write(CPUARMState *env, const ARMCPRegInfo *ri, ARMCPU *cpu = arm_env_get_cpu(env); uint32_t oldval = env->cp15.c14_timer[timeridx].ctl; + trace_arm_gt_ctl_write(timeridx, value); env->cp15.c14_timer[timeridx].ctl = deposit64(oldval, 0, 2, value); if ((oldval ^ value) & 1) { /* Enable toggled */ @@ -1649,8 +1658,10 @@ static void gt_ctl_write(CPUARMState *env, const ARMCPRegInfo *ri, /* IMASK toggled: don't need to recalculate, * just set the interrupt line based on ISTATUS */ - qemu_set_irq(cpu->gt_timer_outputs[timeridx], - (oldval & 4) && !(value & 2)); + int irqstate = (oldval & 4) && !(value & 2); + + trace_arm_gt_imask_toggle(timeridx, irqstate); + qemu_set_irq(cpu->gt_timer_outputs[timeridx], irqstate); } } @@ -1715,6 +1726,7 @@ static void gt_cntvoff_write(CPUARMState *env, const ARMCPRegInfo *ri, { ARMCPU *cpu = arm_env_get_cpu(env); + trace_arm_gt_cntvoff_write(value); raw_write(env, ri, value); gt_recalc_timer(cpu, GTIMER_VIRT); } diff --git a/target-arm/trace-events b/target-arm/trace-events new file mode 100644 index 0000000000..9f726bdae3 --- /dev/null +++ b/target-arm/trace-events @@ -0,0 +1,10 @@ +# See docs/tracing.txt for syntax documentation. + +# target-arm/helper.c +arm_gt_recalc(int timer, int irqstate, uint64_t nexttick) "gt recalc: timer %d irqstate %d next tick %" PRIx64 +arm_gt_recalc_disabled(int timer) "gt recalc: timer %d irqstate 0 timer disabled" +arm_gt_cval_write(int timer, uint64_t value) "gt_cval_write: timer %d value %" PRIx64 +arm_gt_tval_write(int timer, uint64_t value) "gt_tval_write: timer %d value %" PRIx64 +arm_gt_ctl_write(int timer, uint64_t value) "gt_ctl_write: timer %d value %" PRIx64 +arm_gt_imask_toggle(int timer, int irqstate) "gt_ctl_write: timer %d IMASK toggle, new irqstate %d" +arm_gt_cntvoff_write(uint64_t value) "gt_cntvoff_write: value %" PRIx64 -- cgit v1.2.3