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target/alpha: Implement prctl_unalign_sigbus

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Leave TARGET_ALIGNED_ONLY set, but use the new CPUState
flag to set MO_UNALN for the instructions that the kernel
handles in the unaligned trap.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20211227150127.2659293-5-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2021-12-27 07:01:25 -08:00 • committed by Laurent Vivier
parent 6e8dcacd08
commit fed1424617
3 changed files with 28 additions and 10 deletions
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5
target/alpha/cpu.h
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@ -383,6 +383,8 @@ enum {
#define ENV_FLAG_TB_MASK \
(ENV_FLAG_PAL_MODE | ENV_FLAG_PS_USER | ENV_FLAG_FEN)
#define TB_FLAG_UNALIGN (1u << 1)
static inline int cpu_mmu_index(CPUAlphaState *env, bool ifetch)
{
int ret = env->flags & ENV_FLAG_PS_USER ? MMU_USER_IDX : MMU_KERNEL_IDX;
@ -470,6 +472,9 @@ static inline void cpu_get_tb_cpu_state(CPUAlphaState *env, target_ulong *pc,
*pc = env->pc;
*cs_base = 0;
*pflags = env->flags & ENV_FLAG_TB_MASK;
#ifdef CONFIG_USER_ONLY
*pflags |= TB_FLAG_UNALIGN * !env_cpu(env)->prctl_unalign_sigbus;
#endif
}
#ifdef CONFIG_USER_ONLY