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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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2
linux-user/alpha/target_prctl.h
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@ -1 +1 @@
/* No special prctl support required. */
#include "../generic/target_prctl_unalign.h"

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

31
target/alpha/translate.c
View File

@ -45,7 +45,9 @@ typedef struct DisasContext DisasContext;
struct DisasContext {
DisasContextBase base;
#ifndef CONFIG_USER_ONLY
#ifdef CONFIG_USER_ONLY
MemOp unalign;
#else
uint64_t palbr;
#endif
uint32_t tbflags;
@ -68,6 +70,12 @@ struct DisasContext {
TCGv sink;
};
#ifdef CONFIG_USER_ONLY
#define UNALIGN(C) (C)->unalign
#else
#define UNALIGN(C) 0
#endif
/* Target-specific return values from translate_one, indicating the
state of the TB. Note that DISAS_NEXT indicates that we are not
exiting the TB. */
@ -270,7 +278,7 @@ static inline DisasJumpType gen_invalid(DisasContext *ctx)
static void gen_ldf(DisasContext *ctx, TCGv dest, TCGv addr)
{
TCGv_i32 tmp32 = tcg_temp_new_i32();
tcg_gen_qemu_ld_i32(tmp32, addr, ctx->mem_idx, MO_LEUL);
tcg_gen_qemu_ld_i32(tmp32, addr, ctx->mem_idx, MO_LEUL | UNALIGN(ctx));
gen_helper_memory_to_f(dest, tmp32);
tcg_temp_free_i32(tmp32);
}
@ -278,7 +286,7 @@ static void gen_ldf(DisasContext *ctx, TCGv dest, TCGv addr)
static void gen_ldg(DisasContext *ctx, TCGv dest, TCGv addr)
{
TCGv tmp = tcg_temp_new();
tcg_gen_qemu_ld_i64(tmp, addr, ctx->mem_idx, MO_LEQ);
tcg_gen_qemu_ld_i64(tmp, addr, ctx->mem_idx, MO_LEQ | UNALIGN(ctx));
gen_helper_memory_to_g(dest, tmp);
tcg_temp_free(tmp);
}
@ -286,14 +294,14 @@ static void gen_ldg(DisasContext *ctx, TCGv dest, TCGv addr)
static void gen_lds(DisasContext *ctx, TCGv dest, TCGv addr)
{
TCGv_i32 tmp32 = tcg_temp_new_i32();
tcg_gen_qemu_ld_i32(tmp32, addr, ctx->mem_idx, MO_LEUL);
tcg_gen_qemu_ld_i32(tmp32, addr, ctx->mem_idx, MO_LEUL | UNALIGN(ctx));
gen_helper_memory_to_s(dest, tmp32);
tcg_temp_free_i32(tmp32);
}
static void gen_ldt(DisasContext *ctx, TCGv dest, TCGv addr)
{
tcg_gen_qemu_ld_i64(dest, addr, ctx->mem_idx, MO_LEQ);
tcg_gen_qemu_ld_i64(dest, addr, ctx->mem_idx, MO_LEQ | UNALIGN(ctx));
}
static void gen_load_fp(DisasContext *ctx, int ra, int rb, int32_t disp16,
@ -324,6 +332,8 @@ static void gen_load_int(DisasContext *ctx, int ra, int rb, int32_t disp16,
tcg_gen_addi_i64(addr, load_gpr(ctx, rb), disp16);
if (clear) {
tcg_gen_andi_i64(addr, addr, ~0x7);
} else if (!locked) {
op |= UNALIGN(ctx);
}
dest = ctx->ir[ra];
@ -340,7 +350,7 @@ static void gen_stf(DisasContext *ctx, TCGv src, TCGv addr)
{
TCGv_i32 tmp32 = tcg_temp_new_i32();
gen_helper_f_to_memory(tmp32, addr);
tcg_gen_qemu_st_i32(tmp32, addr, ctx->mem_idx, MO_LEUL);
tcg_gen_qemu_st_i32(tmp32, addr, ctx->mem_idx, MO_LEUL | UNALIGN(ctx));
tcg_temp_free_i32(tmp32);
}
@ -348,7 +358,7 @@ static void gen_stg(DisasContext *ctx, TCGv src, TCGv addr)
{
TCGv tmp = tcg_temp_new();
gen_helper_g_to_memory(tmp, src);
tcg_gen_qemu_st_i64(tmp, addr, ctx->mem_idx, MO_LEQ);
tcg_gen_qemu_st_i64(tmp, addr, ctx->mem_idx, MO_LEQ | UNALIGN(ctx));
tcg_temp_free(tmp);
}
@ -356,13 +366,13 @@ static void gen_sts(DisasContext *ctx, TCGv src, TCGv addr)
{
TCGv_i32 tmp32 = tcg_temp_new_i32();
gen_helper_s_to_memory(tmp32, src);
tcg_gen_qemu_st_i32(tmp32, addr, ctx->mem_idx, MO_LEUL);
tcg_gen_qemu_st_i32(tmp32, addr, ctx->mem_idx, MO_LEUL | UNALIGN(ctx));
tcg_temp_free_i32(tmp32);
}
static void gen_stt(DisasContext *ctx, TCGv src, TCGv addr)
{
tcg_gen_qemu_st_i64(src, addr, ctx->mem_idx, MO_LEQ);
tcg_gen_qemu_st_i64(src, addr, ctx->mem_idx, MO_LEQ | UNALIGN(ctx));
}
static void gen_store_fp(DisasContext *ctx, int ra, int rb, int32_t disp16,
@ -383,6 +393,8 @@ static void gen_store_int(DisasContext *ctx, int ra, int rb, int32_t disp16,
tcg_gen_addi_i64(addr, load_gpr(ctx, rb), disp16);
if (clear) {
tcg_gen_andi_i64(addr, addr, ~0x7);
} else {
op |= UNALIGN(ctx);
}
src = load_gpr(ctx, ra);
@ -2942,6 +2954,7 @@ static void alpha_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cpu)
#ifdef CONFIG_USER_ONLY
ctx->ir = cpu_std_ir;
ctx->unalign = (ctx->tbflags & TB_FLAG_UNALIGN ? MO_UNALN : MO_ALIGN);
#else
ctx->palbr = env->palbr;
ctx->ir = (ctx->tbflags & ENV_FLAG_PAL_MODE ? cpu_pal_ir : cpu_std_ir);