From 9fa97e04ae5677cc383b674f8efbf17950b07622 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Alex=20Benn=C3=A9e?= Date: Thu, 27 Oct 2022 19:36:31 +0100 Subject: [PATCH] target/s390x: fake instruction loading when handling 'ex' MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The s390x EXecute instruction is a bit weird as we synthesis the executed instruction from what we have stored in memory. This missed the plugin instrumentation. Work around this with a special helper to inform the rest of the translator about the instruction so things stay consistent. Reviewed-by: David Hildenbrand Acked-by: Ilya Leoshkevich Reviewed-by: Richard Henderson Signed-off-by: Alex Bennée Cc: Richard Henderson Message-Id: <20221027183637.2772968-26-alex.bennee@linaro.org> --- include/exec/translator.h | 17 +++++++++++++++++ target/s390x/tcg/translate.c | 6 ++++++ 2 files changed, 23 insertions(+) diff --git a/include/exec/translator.h b/include/exec/translator.h index 3b77f5f4aa..af2ff95cd5 100644 --- a/include/exec/translator.h +++ b/include/exec/translator.h @@ -211,6 +211,23 @@ translator_ldq_swap(CPUArchState *env, DisasContextBase *db, return ret; } +/** + * translator_fake_ldb - fake instruction load + * @insn8: byte of instruction + * @pc: program counter of instruction + * + * This is a special case helper used where the instruction we are + * about to translate comes from somewhere else (e.g. being + * re-synthesised for s390x "ex"). It ensures we update other areas of + * the translator with details of the executed instruction. + */ + +static inline void translator_fake_ldb(uint8_t insn8, abi_ptr pc) +{ + plugin_insn_append(pc, &insn8, sizeof(insn8)); +} + + /* * Return whether addr is on the same page as where disassembly started. * Translators can use this to enforce the rule that only single-insn diff --git a/target/s390x/tcg/translate.c b/target/s390x/tcg/translate.c index f4122db434..03efccdf9f 100644 --- a/target/s390x/tcg/translate.c +++ b/target/s390x/tcg/translate.c @@ -6317,12 +6317,18 @@ static const DisasInsn *extract_insn(CPUS390XState *env, DisasContext *s) if (unlikely(s->ex_value)) { /* Drop the EX data now, so that it's clear on exception paths. */ TCGv_i64 zero = tcg_const_i64(0); + int i; tcg_gen_st_i64(zero, cpu_env, offsetof(CPUS390XState, ex_value)); tcg_temp_free_i64(zero); /* Extract the values saved by EXECUTE. */ insn = s->ex_value & 0xffffffffffff0000ull; ilen = s->ex_value & 0xf; + /* register insn bytes with translator so plugins work */ + for (i = 0; i < ilen; i++) { + uint8_t byte = extract64(insn, 56 - (i * 8), 8); + translator_fake_ldb(byte, pc + i); + } op = insn >> 56; } else { insn = ld_code2(env, s, pc);