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[PULL 05/21] hvf: arm: Raise an exception for sysreg by default

Peter Maydell posted 21 patches 3 months, 3 weeks ago
There is a newer version of this series
[PULL 05/21] hvf: arm: Raise an exception for sysreg by default
Posted by Peter Maydell 3 months, 3 weeks ago 
From: Akihiko Odaki <akihiko.odaki@daynix.com>

Any sysreg access results in an exception unless defined otherwise so
we should raise an exception by default.

Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/hvf/hvf.c | 174 +++++++++++++++++++++----------------------
 1 file changed, 85 insertions(+), 89 deletions(-)

diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index eb090e67a2f..1a749534fb0 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -1199,57 +1199,56 @@ static bool hvf_sysreg_read_cp(CPUState *cpu, uint32_t reg, uint64_t *val)
     return false;
 }
 
-static int hvf_sysreg_read(CPUState *cpu, uint32_t reg, uint32_t rt)
+static int hvf_sysreg_read(CPUState *cpu, uint32_t reg, uint64_t *val)
 {
     ARMCPU *arm_cpu = ARM_CPU(cpu);
     CPUARMState *env = &arm_cpu->env;
-    uint64_t val = 0;
 
     switch (reg) {
     case SYSREG_CNTPCT_EL0:
-        val = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) /
+        *val = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) /
               gt_cntfrq_period_ns(arm_cpu);
-        break;
+        return 0;
     case SYSREG_PMCR_EL0:
-        val = env->cp15.c9_pmcr;
-        break;
+        *val = env->cp15.c9_pmcr;
+        return 0;
     case SYSREG_PMCCNTR_EL0:
         pmu_op_start(env);
-        val = env->cp15.c15_ccnt;
+        *val = env->cp15.c15_ccnt;
         pmu_op_finish(env);
-        break;
+        return 0;
     case SYSREG_PMCNTENCLR_EL0:
-        val = env->cp15.c9_pmcnten;
-        break;
+        *val = env->cp15.c9_pmcnten;
+        return 0;
     case SYSREG_PMOVSCLR_EL0:
-        val = env->cp15.c9_pmovsr;
-        break;
+        *val = env->cp15.c9_pmovsr;
+        return 0;
     case SYSREG_PMSELR_EL0:
-        val = env->cp15.c9_pmselr;
-        break;
+        *val = env->cp15.c9_pmselr;
+        return 0;
     case SYSREG_PMINTENCLR_EL1:
-        val = env->cp15.c9_pminten;
-        break;
+        *val = env->cp15.c9_pminten;
+        return 0;
     case SYSREG_PMCCFILTR_EL0:
-        val = env->cp15.pmccfiltr_el0;
-        break;
+        *val = env->cp15.pmccfiltr_el0;
+        return 0;
     case SYSREG_PMCNTENSET_EL0:
-        val = env->cp15.c9_pmcnten;
-        break;
+        *val = env->cp15.c9_pmcnten;
+        return 0;
     case SYSREG_PMUSERENR_EL0:
-        val = env->cp15.c9_pmuserenr;
-        break;
+        *val = env->cp15.c9_pmuserenr;
+        return 0;
     case SYSREG_PMCEID0_EL0:
     case SYSREG_PMCEID1_EL0:
         /* We can't really count anything yet, declare all events invalid */
-        val = 0;
-        break;
+        *val = 0;
+        return 0;
     case SYSREG_OSLSR_EL1:
-        val = env->cp15.oslsr_el1;
-        break;
+        *val = env->cp15.oslsr_el1;
+        return 0;
     case SYSREG_OSDLR_EL1:
         /* Dummy register */
-        break;
+        return 0;
     case SYSREG_ICC_AP0R0_EL1:
     case SYSREG_ICC_AP0R1_EL1:
     case SYSREG_ICC_AP0R2_EL1:
@@ -1276,9 +1275,8 @@ static int hvf_sysreg_read(CPUState *cpu, uint32_t reg, uint32_t rt)
     case SYSREG_ICC_SRE_EL1:
     case SYSREG_ICC_CTLR_EL1:
         /* Call the TCG sysreg handler. This is only safe for GICv3 regs. */
-        if (!hvf_sysreg_read_cp(cpu, reg, &val)) {
-            hvf_raise_exception(cpu, EXCP_UDEF, syn_uncategorized());
-            return 1;
+        if (hvf_sysreg_read_cp(cpu, reg, &val)) {
+            return 0;
         }
         break;
     case SYSREG_DBGBVR0_EL1:
@@ -1297,8 +1295,8 @@ static int hvf_sysreg_read(CPUState *cpu, uint32_t reg, uint32_t rt)
     case SYSREG_DBGBVR13_EL1:
     case SYSREG_DBGBVR14_EL1:
     case SYSREG_DBGBVR15_EL1:
-        val = env->cp15.dbgbvr[SYSREG_CRM(reg)];
-        break;
+        *val = env->cp15.dbgbvr[SYSREG_CRM(reg)];
+        return 0;
     case SYSREG_DBGBCR0_EL1:
     case SYSREG_DBGBCR1_EL1:
     case SYSREG_DBGBCR2_EL1:
@@ -1315,8 +1313,8 @@ static int hvf_sysreg_read(CPUState *cpu, uint32_t reg, uint32_t rt)
     case SYSREG_DBGBCR13_EL1:
     case SYSREG_DBGBCR14_EL1:
     case SYSREG_DBGBCR15_EL1:
-        val = env->cp15.dbgbcr[SYSREG_CRM(reg)];
-        break;
+        *val = env->cp15.dbgbcr[SYSREG_CRM(reg)];
+        return 0;
     case SYSREG_DBGWVR0_EL1:
     case SYSREG_DBGWVR1_EL1:
     case SYSREG_DBGWVR2_EL1:
@@ -1333,8 +1331,8 @@ static int hvf_sysreg_read(CPUState *cpu, uint32_t reg, uint32_t rt)
     case SYSREG_DBGWVR13_EL1:
     case SYSREG_DBGWVR14_EL1:
     case SYSREG_DBGWVR15_EL1:
-        val = env->cp15.dbgwvr[SYSREG_CRM(reg)];
-        break;
+        *val = env->cp15.dbgwvr[SYSREG_CRM(reg)];
+        return 0;
     case SYSREG_DBGWCR0_EL1:
     case SYSREG_DBGWCR1_EL1:
     case SYSREG_DBGWCR2_EL1:
@@ -1351,35 +1349,25 @@ static int hvf_sysreg_read(CPUState *cpu, uint32_t reg, uint32_t rt)
     case SYSREG_DBGWCR13_EL1:
     case SYSREG_DBGWCR14_EL1:
     case SYSREG_DBGWCR15_EL1:
-        val = env->cp15.dbgwcr[SYSREG_CRM(reg)];
-        break;
+        *val = env->cp15.dbgwcr[SYSREG_CRM(reg)];
+        return 0;
     default:
         if (is_id_sysreg(reg)) {
             /* ID system registers read as RES0 */
-            val = 0;
-            break;
+            *val = 0;
+            return 0;
         }
-        cpu_synchronize_state(cpu);
-        trace_hvf_unhandled_sysreg_read(env->pc, reg,
-                                        SYSREG_OP0(reg),
-                                        SYSREG_OP1(reg),
-                                        SYSREG_CRN(reg),
-                                        SYSREG_CRM(reg),
-                                        SYSREG_OP2(reg));
-        hvf_raise_exception(cpu, EXCP_UDEF, syn_uncategorized());
-        return 1;
     }
 
-    trace_hvf_sysreg_read(reg,
-                          SYSREG_OP0(reg),
-                          SYSREG_OP1(reg),
-                          SYSREG_CRN(reg),
-                          SYSREG_CRM(reg),
-                          SYSREG_OP2(reg),
-                          val);
-    hvf_set_reg(cpu, rt, val);
-
-    return 0;
+    cpu_synchronize_state(cpu);
+    trace_hvf_unhandled_sysreg_read(env->pc, reg,
+                                    SYSREG_OP0(reg),
+                                    SYSREG_OP1(reg),
+                                    SYSREG_CRN(reg),
+                                    SYSREG_CRM(reg),
+                                    SYSREG_OP2(reg));
+    hvf_raise_exception(cpu, EXCP_UDEF, syn_uncategorized());
+    return 1;
 }
 
 static void pmu_update_irq(CPUARMState *env)
@@ -1503,7 +1491,7 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, uint64_t val)
         pmu_op_start(env);
         env->cp15.c15_ccnt = val;
         pmu_op_finish(env);
-        break;
+        return 0;
     case SYSREG_PMCR_EL0:
         pmu_op_start(env);
 
@@ -1523,45 +1511,45 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, uint64_t val)
         env->cp15.c9_pmcr |= (val & PMCR_WRITABLE_MASK);
 
         pmu_op_finish(env);
-        break;
+        return 0;
     case SYSREG_PMUSERENR_EL0:
         env->cp15.c9_pmuserenr = val & 0xf;
-        break;
+        return 0;
     case SYSREG_PMCNTENSET_EL0:
         env->cp15.c9_pmcnten |= (val & pmu_counter_mask(env));
-        break;
+        return 0;
     case SYSREG_PMCNTENCLR_EL0:
         env->cp15.c9_pmcnten &= ~(val & pmu_counter_mask(env));
-        break;
+        return 0;
     case SYSREG_PMINTENCLR_EL1:
         pmu_op_start(env);
         env->cp15.c9_pminten |= val;
         pmu_op_finish(env);
-        break;
+        return 0;
     case SYSREG_PMOVSCLR_EL0:
         pmu_op_start(env);
         env->cp15.c9_pmovsr &= ~val;
         pmu_op_finish(env);
-        break;
+        return 0;
     case SYSREG_PMSWINC_EL0:
         pmu_op_start(env);
         pmswinc_write(env, val);
         pmu_op_finish(env);
-        break;
+        return 0;
     case SYSREG_PMSELR_EL0:
         env->cp15.c9_pmselr = val & 0x1f;
-        break;
+        return 0;
     case SYSREG_PMCCFILTR_EL0:
         pmu_op_start(env);
         env->cp15.pmccfiltr_el0 = val & PMCCFILTR_EL0;
         pmu_op_finish(env);
-        break;
+        return 0;
     case SYSREG_OSLAR_EL1:
         env->cp15.oslsr_el1 = val & 1;
-        break;
+        return 0;
     case SYSREG_OSDLR_EL1:
         /* Dummy register */
-        break;
+        return 0;
     case SYSREG_ICC_AP0R0_EL1:
     case SYSREG_ICC_AP0R1_EL1:
     case SYSREG_ICC_AP0R2_EL1:
@@ -1591,10 +1579,10 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, uint64_t val)
         if (!hvf_sysreg_write_cp(cpu, reg, val)) {
             hvf_raise_exception(cpu, EXCP_UDEF, syn_uncategorized());
         }
-        break;
+        return 0;
     case SYSREG_MDSCR_EL1:
         env->cp15.mdscr_el1 = val;
-        break;
+        return 0;
     case SYSREG_DBGBVR0_EL1:
     case SYSREG_DBGBVR1_EL1:
     case SYSREG_DBGBVR2_EL1:
@@ -1612,7 +1600,7 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, uint64_t val)
     case SYSREG_DBGBVR14_EL1:
     case SYSREG_DBGBVR15_EL1:
         env->cp15.dbgbvr[SYSREG_CRM(reg)] = val;
-        break;
+        return 0;
     case SYSREG_DBGBCR0_EL1:
     case SYSREG_DBGBCR1_EL1:
     case SYSREG_DBGBCR2_EL1:
@@ -1630,7 +1618,7 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, uint64_t val)
     case SYSREG_DBGBCR14_EL1:
     case SYSREG_DBGBCR15_EL1:
         env->cp15.dbgbcr[SYSREG_CRM(reg)] = val;
-        break;
+        return 0;
     case SYSREG_DBGWVR0_EL1:
     case SYSREG_DBGWVR1_EL1:
     case SYSREG_DBGWVR2_EL1:
@@ -1648,7 +1636,7 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, uint64_t val)
     case SYSREG_DBGWVR14_EL1:
     case SYSREG_DBGWVR15_EL1:
         env->cp15.dbgwvr[SYSREG_CRM(reg)] = val;
-        break;
+        return 0;
     case SYSREG_DBGWCR0_EL1:
     case SYSREG_DBGWCR1_EL1:
     case SYSREG_DBGWCR2_EL1:
@@ -1666,20 +1654,18 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, uint64_t val)
     case SYSREG_DBGWCR14_EL1:
     case SYSREG_DBGWCR15_EL1:
         env->cp15.dbgwcr[SYSREG_CRM(reg)] = val;
-        break;
-    default:
-        cpu_synchronize_state(cpu);
-        trace_hvf_unhandled_sysreg_write(env->pc, reg,
-                                         SYSREG_OP0(reg),
-                                         SYSREG_OP1(reg),
-                                         SYSREG_CRN(reg),
-                                         SYSREG_CRM(reg),
-                                         SYSREG_OP2(reg));
-        hvf_raise_exception(cpu, EXCP_UDEF, syn_uncategorized());
-        return 1;
+        return 0;
     }
 
-    return 0;
+    cpu_synchronize_state(cpu);
+    trace_hvf_unhandled_sysreg_write(env->pc, reg,
+                                     SYSREG_OP0(reg),
+                                     SYSREG_OP1(reg),
+                                     SYSREG_CRN(reg),
+                                     SYSREG_CRM(reg),
+                                     SYSREG_OP2(reg));
+    hvf_raise_exception(cpu, EXCP_UDEF, syn_uncategorized());
+    return 1;
 }
 
 static int hvf_inject_interrupts(CPUState *cpu)
@@ -1944,7 +1930,17 @@ int hvf_vcpu_exec(CPUState *cpu)
         int sysreg_ret = 0;
 
         if (isread) {
-            sysreg_ret = hvf_sysreg_read(cpu, reg, rt);
+            sysreg_ret = hvf_sysreg_read(cpu, reg, &val);
+            if (!sysreg_ret) {
+                trace_hvf_sysreg_read(reg,
+                                      SYSREG_OP0(reg),
+                                      SYSREG_OP1(reg),
+                                      SYSREG_CRN(reg),
+                                      SYSREG_CRM(reg),
+                                      SYSREG_OP2(reg),
+                                      val);
+                hvf_set_reg(cpu, rt, val);
+            }
         } else {
             val = hvf_get_reg(cpu, rt);
             sysreg_ret = hvf_sysreg_write(cpu, reg, val);
-- 
2.34.1
Re: [PULL 05/21] hvf: arm: Raise an exception for sysreg by default
Posted by Richard Henderson 3 months, 3 weeks ago 
On 7/30/24 19:40, Peter Maydell wrote:
> From: Akihiko Odaki <akihiko.odaki@daynix.com>
> 
> Any sysreg access results in an exception unless defined otherwise so
> we should raise an exception by default.
> 
> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>   target/arm/hvf/hvf.c | 174 +++++++++++++++++++++----------------------
>   1 file changed, 85 insertions(+), 89 deletions(-)


This patch fails to compile:

https://gitlab.com/qemu-project/qemu/-/jobs/7489527235

../target/arm/hvf/hvf.c:1283:42: error: incompatible pointer types passing 'uint64_t **' 
(aka 'unsigned long long **') to parameter of type 'uint64_t *' (aka 'unsigned long long 
*'); remove & [-Werror,-Wincompatible-pointer-types]
         if (hvf_sysreg_read_cp(cpu, reg, &val)) {
                                          ^~~~
../target/arm/hvf/hvf.c:1175:71: note: passing argument to parameter 'val' here
static bool hvf_sysreg_read_cp(CPUState *cpu, uint32_t reg, uint64_t *val)
                                                                       ^
1 error generated.

This snuck in while our Cirrus build minutes were exhausted, but it suggests that the 
patch was never tested at all.


r~
Re: [PULL 05/21] hvf: arm: Raise an exception for sysreg by default
Posted by Akihiko Odaki 3 months, 3 weeks ago 
On 2024/08/02 16:51, Richard Henderson wrote:
> On 7/30/24 19:40, Peter Maydell wrote:
>> From: Akihiko Odaki <akihiko.odaki@daynix.com>
>>
>> Any sysreg access results in an exception unless defined otherwise so
>> we should raise an exception by default.
>>
>> Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
>> Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
>> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
>> ---
>>   target/arm/hvf/hvf.c | 174 +++++++++++++++++++++----------------------
>>   1 file changed, 85 insertions(+), 89 deletions(-)
> 
> 
> This patch fails to compile:
> 
> https://gitlab.com/qemu-project/qemu/-/jobs/7489527235
> 
> ../target/arm/hvf/hvf.c:1283:42: error: incompatible pointer types 
> passing 'uint64_t **' (aka 'unsigned long long **') to parameter of type 
> 'uint64_t *' (aka 'unsigned long long *'); remove & 
> [-Werror,-Wincompatible-pointer-types]
>          if (hvf_sysreg_read_cp(cpu, reg, &val)) {
>                                           ^~~~
> ../target/arm/hvf/hvf.c:1175:71: note: passing argument to parameter 
> 'val' here
> static bool hvf_sysreg_read_cp(CPUState *cpu, uint32_t reg, uint64_t *val)
>                                                                        ^
> 1 error generated.
> 
> This snuck in while our Cirrus build minutes were exhausted, but it 
> suggests that the patch was never tested at all.

I have just submitted a fix. I'm sorry for causing a mess.

This is a problem in my workflow. I wrote the code on Linux, tested and 
fixed it on macOS. However I forgot to synchronize the code between 
macOS and Linux before sending it on Linux.

Regards,
Akihiko Odaki

Patchew 2.1-devel-b67e4c2

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