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File _service:gitpkg:0021-target-arm-Implement-AArch64-DAIF-system-register.patch of Package qemu-usermode
From 025eb1a315af6fcfc6bf1df511d652377c26951c Mon Sep 17 00:00:00 2001 From: Peter Maydell <peter.maydell@linaro.org> Date: Sat, 15 Feb 2014 16:07:14 +0000 Subject: [PATCH] target-arm: Implement AArch64 DAIF system register Implement the DAIF system register which is a view of the DAIF bits in PSTATE. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com> --- target-arm/helper.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/target-arm/helper.c b/target-arm/helper.c index 3a73100..b381813 100644 --- a/target-arm/helper.c +++ b/target-arm/helper.c @@ -1589,6 +1589,25 @@ static void aa64_fpsr_write(CPUARMState *env, const ARMCPRegInfo *ri, vfp_set_fpsr(env, value); } +static CPAccessResult aa64_daif_access(CPUARMState *env, const ARMCPRegInfo *ri) +{ + if (arm_current_pl(env) == 0 && !(env->cp15.c1_sys & SCTLR_UMA)) { + return CP_ACCESS_TRAP; + } + return CP_ACCESS_OK; +} + +static uint64_t aa64_daif_read(CPUARMState *env, const ARMCPRegInfo *ri) +{ + return env->daif; +} + +static void aa64_daif_write(CPUARMState *env, const ARMCPRegInfo *ri, + uint64_t value) +{ + env->daif = value & PSTATE_DAIF; +} + static CPAccessResult aa64_cacheop_access(CPUARMState *env, const ARMCPRegInfo *ri) { @@ -1632,6 +1651,11 @@ static const ARMCPRegInfo v8_cp_reginfo[] = { { .name = "NZCV", .state = ARM_CP_STATE_AA64, .opc0 = 3, .opc1 = 3, .opc2 = 0, .crn = 4, .crm = 2, .access = PL0_RW, .type = ARM_CP_NZCV }, + { .name = "DAIF", .state = ARM_CP_STATE_AA64, + .opc0 = 3, .opc1 = 3, .opc2 = 1, .crn = 4, .crm = 2, + .type = ARM_CP_NO_MIGRATE, + .access = PL0_RW, .accessfn = aa64_daif_access, + .readfn = aa64_daif_read, .writefn = aa64_daif_write }, { .name = "FPCR", .state = ARM_CP_STATE_AA64, .opc0 = 3, .opc1 = 3, .opc2 = 0, .crn = 4, .crm = 4, .access = PL0_RW, .readfn = aa64_fpcr_read, .writefn = aa64_fpcr_write }, -- 1.9.3
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