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target/riscv: Convert RVXI fence insns to decodetree

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Acked-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: Peer Adelt <peer.adelt@hni.uni-paderborn.de>
This commit is contained in:
Bastian Koppelmann 2019-02-13 07:53:46 -08:00
parent b73a987b09
commit 0c865e856a
3 changed files with 21 additions and 12 deletions
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2
target/riscv/insn32.decode
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@ -82,3 +82,5 @@ srl 0000000 ..... ..... 101 ..... 0110011 @r
sra 0100000 ..... ..... 101 ..... 0110011 @r
or 0000000 ..... ..... 110 ..... 0110011 @r
and 0000000 ..... ..... 111 ..... 0110011 @r
fence ---- pred:4 succ:4 ----- 000 ----- 0001111
fence_i ---- ---- ---- ----- 001 ----- 0001111

19
target/riscv/insn_trans/trans_rvi.inc.c
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@ -318,3 +318,22 @@ static bool trans_sraw(DisasContext *ctx, arg_sraw *a)
return true;
}
#endif
static bool trans_fence(DisasContext *ctx, arg_fence *a)
{
/* FENCE is a full memory barrier. */
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC);
return true;
}
static bool trans_fence_i(DisasContext *ctx, arg_fence_i *a)
{
/*
* FENCE_I is a no-op in QEMU,
* however we need to end the translation block
*/
tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn);
tcg_gen_exit_tb(NULL, 0);
ctx->base.is_jmp = DISAS_NORETURN;
return true;
}

12
target/riscv/translate.c
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@ -1950,18 +1950,6 @@ static void decode_RV32_64G(DisasContext *ctx)
gen_fp_arith(ctx, MASK_OP_FP_ARITH(ctx->opcode), rd, rs1, rs2,
GET_RM(ctx->opcode));
break;
case OPC_RISC_FENCE:
if (ctx->opcode & 0x1000) {
/* FENCE_I is a no-op in QEMU,
* however we need to end the translation block */
tcg_gen_movi_tl(cpu_pc, ctx->pc_succ_insn);
tcg_gen_exit_tb(NULL, 0);
ctx->base.is_jmp = DISAS_NORETURN;
} else {
/* FENCE is a full memory barrier. */
tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC);
}
break;
case OPC_RISC_SYSTEM:
gen_system(ctx, MASK_OP_SYSTEM(ctx->opcode), rd, rs1,
(ctx->opcode & 0xFFF00000) >> 20);