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target/sh4: Implement prctl_unalign_sigbus 

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>
pull/216/head
Richard Henderson 5 years ago
committed by Laurent Vivier
parent
217d1a5ef8
commit
4da06fb306
3 changed files with 39 additions and 17 deletions
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  1. 2
      linux-user/sh4/target_prctl.h
  2. 4
      target/sh4/cpu.h
  3. 50
      target/sh4/translate.c

2
linux-user/sh4/target_prctl.h
View File

@ -1 +1 @@
/* No special prctl support required. */
#include "../generic/target_prctl_unalign.h"

4
target/sh4/cpu.h
View File

@ -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 */

50
target/sh4/translate.c
View File

@ -50,8 +50,10 @@ typedef struct DisasContext {
#if defined(CONFIG_USER_ONLY)
#define IS_USER(ctx) 1
#define UNALIGN(C) (ctx->tbflags & TB_FLAG_UNALIGN ? MO_UNALN : MO_ALIGN)
#else
#define IS_USER(ctx) (!(ctx->tbflags & (1u << SR_MD)))
#define UNALIGN(C) 0
#endif
/* Target-specific values for ctx->base.is_jmp. */
@ -495,7 +497,8 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv addr = tcg_temp_new();
tcg_gen_addi_i32(addr, REG(B11_8), B3_0 * 4);
tcg_gen_qemu_st_i32(REG(B7_4), addr, ctx->memidx, MO_TEUL);
tcg_gen_qemu_st_i32(REG(B7_4), addr, ctx->memidx,
MO_TEUL | UNALIGN(ctx));
tcg_temp_free(addr);
}
return;
@ -503,7 +506,8 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv addr = tcg_temp_new();
tcg_gen_addi_i32(addr, REG(B7_4), B3_0 * 4);
tcg_gen_qemu_ld_i32(REG(B11_8), addr, ctx->memidx, MO_TESL);
tcg_gen_qemu_ld_i32(REG(B11_8), addr, ctx->memidx,
MO_TESL | UNALIGN(ctx));
tcg_temp_free(addr);
}
return;
@ -558,19 +562,23 @@ static void _decode_opc(DisasContext * ctx)
tcg_gen_qemu_st_i32(REG(B7_4), REG(B11_8), ctx->memidx, MO_UB);
return;
case 0x2001: /* mov.w Rm,@Rn */
tcg_gen_qemu_st_i32(REG(B7_4), REG(B11_8), ctx->memidx, MO_TEUW);
tcg_gen_qemu_st_i32(REG(B7_4), REG(B11_8), ctx->memidx,
MO_TEUW | UNALIGN(ctx));
return;
case 0x2002: /* mov.l Rm,@Rn */
tcg_gen_qemu_st_i32(REG(B7_4), REG(B11_8), ctx->memidx, MO_TEUL);
tcg_gen_qemu_st_i32(REG(B7_4), REG(B11_8), ctx->memidx,
MO_TEUL | UNALIGN(ctx));
return;
case 0x6000: /* mov.b @Rm,Rn */
tcg_gen_qemu_ld_i32(REG(B11_8), REG(B7_4), ctx->memidx, MO_SB);
return;
case 0x6001: /* mov.w @Rm,Rn */
tcg_gen_qemu_ld_i32(REG(B11_8), REG(B7_4), ctx->memidx, MO_TESW);
tcg_gen_qemu_ld_i32(REG(B11_8), REG(B7_4), ctx->memidx,
MO_TESW | UNALIGN(ctx));
return;
case 0x6002: /* mov.l @Rm,Rn */
tcg_gen_qemu_ld_i32(REG(B11_8), REG(B7_4), ctx->memidx, MO_TESL);
tcg_gen_qemu_ld_i32(REG(B11_8), REG(B7_4), ctx->memidx,
MO_TESL | UNALIGN(ctx));
return;
case 0x2004: /* mov.b Rm,@-Rn */
{
@ -586,7 +594,8 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv addr = tcg_temp_new();
tcg_gen_subi_i32(addr, REG(B11_8), 2);
tcg_gen_qemu_st_i32(REG(B7_4), addr, ctx->memidx, MO_TEUW);
tcg_gen_qemu_st_i32(REG(B7_4), addr, ctx->memidx,
MO_TEUW | UNALIGN(ctx));
tcg_gen_mov_i32(REG(B11_8), addr);
tcg_temp_free(addr);
}
@ -595,7 +604,8 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv addr = tcg_temp_new();
tcg_gen_subi_i32(addr, REG(B11_8), 4);
tcg_gen_qemu_st_i32(REG(B7_4), addr, ctx->memidx, MO_TEUL);
tcg_gen_qemu_st_i32(REG(B7_4), addr, ctx->memidx,
MO_TEUL | UNALIGN(ctx));
tcg_gen_mov_i32(REG(B11_8), addr);
tcg_temp_free(addr);
}
@ -606,12 +616,14 @@ static void _decode_opc(DisasContext * ctx)
tcg_gen_addi_i32(REG(B7_4), REG(B7_4), 1);
return;
case 0x6005: /* mov.w @Rm+,Rn */
tcg_gen_qemu_ld_i32(REG(B11_8), REG(B7_4), ctx->memidx, MO_TESW);
tcg_gen_qemu_ld_i32(REG(B11_8), REG(B7_4), ctx->memidx,
MO_TESW | UNALIGN(ctx));
if ( B11_8 != B7_4 )
tcg_gen_addi_i32(REG(B7_4), REG(B7_4), 2);
return;
case 0x6006: /* mov.l @Rm+,Rn */
tcg_gen_qemu_ld_i32(REG(B11_8), REG(B7_4), ctx->memidx, MO_TESL);
tcg_gen_qemu_ld_i32(REG(B11_8), REG(B7_4), ctx->memidx,
MO_TESL | UNALIGN(ctx));
if ( B11_8 != B7_4 )
tcg_gen_addi_i32(REG(B7_4), REG(B7_4), 4);
return;
@ -627,7 +639,8 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv addr = tcg_temp_new();
tcg_gen_add_i32(addr, REG(B11_8), REG(0));
tcg_gen_qemu_st_i32(REG(B7_4), addr, ctx->memidx, MO_TEUW);
tcg_gen_qemu_st_i32(REG(B7_4), addr, ctx->memidx,
MO_TEUW | UNALIGN(ctx));
tcg_temp_free(addr);
}
return;
@ -635,7 +648,8 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv addr = tcg_temp_new();
tcg_gen_add_i32(addr, REG(B11_8), REG(0));
tcg_gen_qemu_st_i32(REG(B7_4), addr, ctx->memidx, MO_TEUL);
tcg_gen_qemu_st_i32(REG(B7_4), addr, ctx->memidx,
MO_TEUL | UNALIGN(ctx));
tcg_temp_free(addr);
}
return;
@ -651,7 +665,8 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv addr = tcg_temp_new();
tcg_gen_add_i32(addr, REG(B7_4), REG(0));
tcg_gen_qemu_ld_i32(REG(B11_8), addr, ctx->memidx, MO_TESW);
tcg_gen_qemu_ld_i32(REG(B11_8), addr, ctx->memidx,
MO_TESW | UNALIGN(ctx));
tcg_temp_free(addr);
}
return;
@ -659,7 +674,8 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv addr = tcg_temp_new();
tcg_gen_add_i32(addr, REG(B7_4), REG(0));
tcg_gen_qemu_ld_i32(REG(B11_8), addr, ctx->memidx, MO_TESL);
tcg_gen_qemu_ld_i32(REG(B11_8), addr, ctx->memidx,
MO_TESL | UNALIGN(ctx));
tcg_temp_free(addr);
}
return;
@ -1253,7 +1269,8 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv addr = tcg_temp_new();
tcg_gen_addi_i32(addr, REG(B7_4), B3_0 * 2);
tcg_gen_qemu_st_i32(REG(0), addr, ctx->memidx, MO_TEUW);
tcg_gen_qemu_st_i32(REG(0), addr, ctx->memidx,
MO_TEUW | UNALIGN(ctx));
tcg_temp_free(addr);
}
return;
@ -1269,7 +1286,8 @@ static void _decode_opc(DisasContext * ctx)
{
TCGv addr = tcg_temp_new();
tcg_gen_addi_i32(addr, REG(B7_4), B3_0 * 2);
tcg_gen_qemu_ld_i32(REG(0), addr, ctx->memidx, MO_TESW);
tcg_gen_qemu_ld_i32(REG(0), addr, ctx->memidx,
MO_TESW | UNALIGN(ctx));
tcg_temp_free(addr);
}
return;

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