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target/arm: Replace CPSR_ERET_MASK with aarch32_cpsr_valid_mask 

CPSR_ERET_MASK was a useless renaming of CPSR_RESERVED.
The function also takes into account bits that the cpu
does not support.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20200208125816.14954-8-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2020-02-08 12:58:03 +00:00 committed by Peter Maydell
parent f062d1447f
commit 437864216d
2 changed files with 4 additions and 3 deletions
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2
target/arm/cpu.h
View File

@ -1209,8 +1209,6 @@ void pmu_init(ARMCPU *cpu);
#define CPSR_USER (CPSR_NZCV | CPSR_Q | CPSR_GE)
/* Execution state bits. MRS read as zero, MSR writes ignored. */
#define CPSR_EXEC (CPSR_T | CPSR_IT | CPSR_J | CPSR_IL)
/* Mask of bits which may be set by exception return copying them from SPSR */
#define CPSR_ERET_MASK (~CPSR_RESERVED)
/* Bit definitions for M profile XPSR. Most are the same as CPSR. */
#define XPSR_EXCP 0x1ffU

5
target/arm/op_helper.c
View File

@ -400,11 +400,14 @@ void HELPER(cpsr_write)(CPUARMState *env, uint32_t val, uint32_t mask)
/* Write the CPSR for a 32-bit exception return */
void HELPER(cpsr_write_eret)(CPUARMState *env, uint32_t val)
{
uint32_t mask;
qemu_mutex_lock_iothread();
arm_call_pre_el_change_hook(env_archcpu(env));
qemu_mutex_unlock_iothread();
cpsr_write(env, val, CPSR_ERET_MASK, CPSRWriteExceptionReturn);
mask = aarch32_cpsr_valid_mask(env->features, &env_archcpu(env)->isar);
cpsr_write(env, val, mask, CPSRWriteExceptionReturn);
/* Generated code has already stored the new PC value, but
* without masking out its low bits, because which bits need