void cpsr_write(CPUARMState *env, uint32_t val, uint32_t mask, CPSRWriteType write_type) { uint32_t changed_daif; if (mask & CPSR_NZCV) { env->ZF = (~val) & CPSR_Z; env->NF = val; env->CF = (val >> 29) & 1; env->VF = (val << 3) & 0x80000000; } if (mask & CPSR_Q) env->QF = ((val & CPSR_Q) != 0); if (mask & CPSR_T) env->thumb = ((val & CPSR_T) != 0); if (mask & CPSR_IT_0_1) { env->condexec_bits &= ~3; env->condexec_bits |= (val >> 25) & 3; } if (mask & CPSR_IT_2_7) { env->condexec_bits &= 3; env->condexec_bits |= (val >> 8) & 0xfc; } if (mask & CPSR_GE) { env->GE = (val >> 16) & 0xf; } /* In a V7 implementation that includes the security extensions but does * not include Virtualization Extensions the SCR.FW and SCR.AW bits control * whether non-secure software is allowed to change the CPSR_F and CPSR_A * bits respectively. * * In a V8 implementation, it is permitted for privileged software to * change the CPSR A/F bits regardless of the SCR.AW/FW bits. */ if (write_type != CPSRWriteRaw && !arm_feature(env, ARM_FEATURE_V8) && arm_feature(env, ARM_FEATURE_EL3) && !arm_feature(env, ARM_FEATURE_EL2) && !arm_is_secure(env)) { changed_daif = (env->daif ^ val) & mask; if (changed_daif & CPSR_A) { /* Check to see if we are allowed to change the masking of async * abort exceptions from a non-secure state. */ if (!(env->cp15.scr_el3 & SCR_AW)) { qemu_log_mask(LOG_GUEST_ERROR, "Ignoring attempt to switch CPSR_A flag from " "non-secure world with SCR.AW bit clear\n"); mask &= ~CPSR_A; } } if (changed_daif & CPSR_F) { /* Check to see if we are allowed to change the masking of FIQ * exceptions from a non-secure state. */ if (!(env->cp15.scr_el3 & SCR_FW)) { qemu_log_mask(LOG_GUEST_ERROR, "Ignoring attempt to switch CPSR_F flag from " "non-secure world with SCR.FW bit clear\n"); mask &= ~CPSR_F; } /* Check whether non-maskable FIQ (NMFI) support is enabled. * If this bit is set software is not allowed to mask * FIQs, but is allowed to set CPSR_F to 0. */ if ((A32_BANKED_CURRENT_REG_GET(env, sctlr) & SCTLR_NMFI) && (val & CPSR_F)) { qemu_log_mask(LOG_GUEST_ERROR, "Ignoring attempt to enable CPSR_F flag " "(non-maskable FIQ [NMFI] support enabled)\n"); mask &= ~CPSR_F; } } } env->daif &= ~(CPSR_AIF & mask); env->daif |= val & CPSR_AIF & mask; if (write_type != CPSRWriteRaw && (env->uncached_cpsr & CPSR_M) != CPSR_USER && ((env->uncached_cpsr ^ val) & mask & CPSR_M)) { if (bad_mode_switch(env, val & CPSR_M)) { /* Attempt to switch to an invalid mode: this is UNPREDICTABLE. * We choose to ignore the attempt and leave the CPSR M field * untouched. */ mask &= ~CPSR_M; } else { switch_mode(env, val & CPSR_M); } } mask &= ~CACHED_CPSR_BITS; env->uncached_cpsr = (env->uncached_cpsr & ~mask) | (val & mask); }