From: Bastian Koppelmann Date: Thu, 2 Feb 2023 12:04:29 +0000 (+0100) Subject: target/tricore: Fix OPC2_32_RRRR_DEXTR X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a4d5d153c4c53076cea70c1609f3d7427322586b;p=qemu.git target/tricore: Fix OPC2_32_RRRR_DEXTR if cpu_gpr_d[r3] == 0 then we were shifting the lower register to the right by 32 which is undefined behaviour. In this case the TriCore would do nothing an just return the higher register cpu_reg_d[r1]. We fixed that by detecting whether cpu_gpr_d[r3] was zero and cleared the lower register. Reviewed-by: Richard Henderson Signed-off-by: Bastian Koppelmann Message-Id: <20230202120432.1268-8-kbastian@mail.uni-paderborn.de> Signed-off-by: Bastian Koppelmann --- diff --git a/target/tricore/translate.c b/target/tricore/translate.c index 3b4ec530b1..8bf78b46d0 100644 --- a/target/tricore/translate.c +++ b/target/tricore/translate.c @@ -8245,10 +8245,19 @@ static void decode_rrrr_extract_insert(DisasContext *ctx) if (r1 == r2) { tcg_gen_rotl_tl(cpu_gpr_d[r4], cpu_gpr_d[r1], tmp_pos); } else { + TCGv msw = tcg_temp_new(); + TCGv zero = tcg_constant_tl(0); tcg_gen_shl_tl(tmp_width, cpu_gpr_d[r1], tmp_pos); - tcg_gen_subfi_tl(tmp_pos, 32, tmp_pos); - tcg_gen_shr_tl(tmp_pos, cpu_gpr_d[r2], tmp_pos); - tcg_gen_or_tl(cpu_gpr_d[r4], tmp_width, tmp_pos); + tcg_gen_subfi_tl(msw, 32, tmp_pos); + tcg_gen_shr_tl(msw, cpu_gpr_d[r2], msw); + /* + * if pos == 0, then we do cpu_gpr_d[r2] << 32, which is undefined + * behaviour. So check that case here and set the low bits to zero + * which effectivly returns cpu_gpr_d[r1] + */ + tcg_gen_movcond_tl(TCG_COND_EQ, msw, tmp_pos, zero, zero, msw); + tcg_gen_or_tl(cpu_gpr_d[r4], tmp_width, msw); + tcg_temp_free(msw); } break; case OPC2_32_RRRR_EXTR: