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target/sh4: 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.

The Linux kernel does not handle all memory operations: no
floating-point and no MAC.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20211227150127.2659293-7-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2021-12-27 07:01:27 -08:00 • committed by Laurent Vivier
parent 217d1a5ef8
commit 4da06fb306
3 changed files with 39 additions and 17 deletions
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4
target/sh4/cpu.h
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@ -83,6 +83,7 @@
#define DELAY_SLOT_RTE (1 << 2)
#define TB_FLAG_PENDING_MOVCA (1 << 3)
#define TB_FLAG_UNALIGN (1 << 4)
#define GUSA_SHIFT 4
#ifdef CONFIG_USER_ONLY
@ -373,6 +374,9 @@ static inline void cpu_get_tb_cpu_state(CPUSH4State *env, target_ulong *pc,
| (env->sr & ((1u << SR_MD) | (1u << SR_RB))) /* Bits 29-30 */
| (env->sr & (1u << SR_FD)) /* Bit 15 */
| (env->movcal_backup ? TB_FLAG_PENDING_MOVCA : 0); /* Bit 3 */
#ifdef CONFIG_USER_ONLY
*flags |= TB_FLAG_UNALIGN * !env_cpu(env)->prctl_unalign_sigbus;
#endif
}
#endif /* SH4_CPU_H */