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target/arm: don't bother with id_aa64pfr0_read for USER_ONLY

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For system emulation we need to check the state of the GIC before we
report the value. However this isn't relevant to exporting of the
value to linux-user and indeed breaks the exported value as set by
modify_arm_cp_regs.

Backports commit 976b99b6ec2e15cd7c36d72fdb9b60c37c5494f8 from qemu
This commit is contained in:
Alex Bennée 2020-04-30 06:24:01 -04:00 committed by Lioncash
parent cf08d74c26
commit 46e1dab19e
1 changed files with 15 additions and 5 deletions
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20
qemu/target/arm/helper.c
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@ -6395,6 +6395,7 @@ static uint64_t id_pfr1_read(CPUARMState *env, const ARMCPRegInfo *ri)
return pfr1;
}
#ifndef CONFIG_USER_ONLY
static uint64_t id_aa64pfr0_read(CPUARMState *env, const ARMCPRegInfo *ri)
{
ARMCPU *cpu = env_archcpu(env);
@ -6405,6 +6406,7 @@ static uint64_t id_aa64pfr0_read(CPUARMState *env, const ARMCPRegInfo *ri)
}
return pfr0;
}
#endif
/* Shared logic between LORID and the rest of the LOR* registers.
* Secure state has already been delt with.
@ -6983,16 +6985,24 @@ void register_cp_regs_for_features(ARMCPU *cpu)
* define new registers here.
*/
ARMCPRegInfo v8_idregs[] = {
/* ID_AA64PFR0_EL1 is not a plain ARM_CP_CONST because we don't
* know the right value for the GIC field until after we
* define these regs.
/*
* ID_AA64PFR0_EL1 is not a plain ARM_CP_CONST in system
* emulation because we don't know the right value for the
* GIC field until after we define these regs.
*/
{ .name = "ID_AA64PFR0_EL1", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 0, .crn = 0, .crm = 4, .opc2 = 0,
.access = PL1_R, .type = ARM_CP_NO_RAW,
#ifdef CONFIG_USER_ONLY
.type = ARM_CP_CONST,
.resetvalue = cpu->isar.id_aa64pfr0
#else
.type = ARM_CP_NO_RAW,
.accessfn = access_aa64_tid3,
.readfn = id_aa64pfr0_read,
.writefn = arm_cp_write_ignore },
.writefn = arm_cp_write_ignore
#endif
},
{ .name = "ID_AA64PFR1_EL1", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 0, .crn = 0, .crm = 4, .opc2 = 1,
.access = PL1_R, .type = ARM_CP_CONST,