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[209.51.188.17]) by mx.google.com with ESMTPS id s9si17621964qtj.335.2019.10.14.04.20.31 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 14 Oct 2019 04:20:31 -0700 (PDT) Received-SPF: pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; Authentication-Results: mx.google.com; dkim=fail header.i=@linaro.org header.s=google header.b=Dej9oXWW; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: from localhost ([::1]:47604 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iJyOs-0005tL-HO for patch@linaro.org; Mon, 14 Oct 2019 07:20:30 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45379) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iJy25-0006Uz-TZ for qemu-devel@nongnu.org; Mon, 14 Oct 2019 06:56:59 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iJy22-000516-Td for qemu-devel@nongnu.org; Mon, 14 Oct 2019 06:56:57 -0400 Received: from mail-wm1-x341.google.com ([2a00:1450:4864:20::341]:50409) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1iJy22-00050B-Mx for qemu-devel@nongnu.org; Mon, 14 Oct 2019 06:56:54 -0400 Received: by mail-wm1-x341.google.com with SMTP id 5so16783210wmg.0 for ; Mon, 14 Oct 2019 03:56:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=j/zM8w2UQVs1nwStRjcaLSLZ/8bKSPRTKMusEwFjutc=; b=Dej9oXWW14KR5gGGkav99r/Wmz4AauPLq9M20BH1yuz+s0xopUT9eT14R4P+WtVkJ4 jkhxwWLIavpqaO1CG3hrAp45KpqN4vrxWa+8ZZuQhGdXBBG0TSWvU/5AJMPpbKbtS1Ye +kK2o9A5hTq20e3V7isXfbN79POE95Y0hDl3s0T0uz6pwtPiP1klI6mFtTEW7QJ/Ix99 XYsZTIPJbRg6uP//fse7TU66GJFj6b5iGuEpswr/Iy0kge9pM0kXt6jobYhcmXPF+h1m Siau/ACWzmrBOwahnLMICFD6TtxJMDClVOAESaf804NmD0/IND8PMUpXv6LSZ/C2P+VH bUKQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=j/zM8w2UQVs1nwStRjcaLSLZ/8bKSPRTKMusEwFjutc=; b=nvMlr3Uc6mGF9jGSWXMscFUR1dxET57nyO2sjlL3sLjgUXPnyNJq6nq22xUJ+dEqXz dP3+yGYKqHcaTHdHlSkY1Ktw7cI5laDHsm/CdRN5rtS1UUT54rHxFIuT1QPUlzSK7QHg ClY6NFVf8UETLv7UUouo6bMQW7n+ZEjSrjplKmT4aiPErpr5dgSNwvhTEHk+0CkdI+9t Gi8vUcd/qCpC0qHBxklmoqnRZvvHIV5b/F8ZQfFgbopiSoaiZspYBD/FZXHfwsUHJHmQ a+Y3xc94nS2XQFe079Of6wPrKrzCLagU7d5qCYv56GJneJ4XgTPfnuqQ2bqxqRPCjlFP /hXg== X-Gm-Message-State: APjAAAXQUQIIiJ1mSvXgkfFRs2mR2LWl9XoCeEjbrOdyMqQtdrDcF+ZY BcuBYu325uXH+fTggJvYaXVMemHGhLk= X-Received: by 2002:a1c:9d4a:: with SMTP id g71mr15229671wme.26.1571050613553; Mon, 14 Oct 2019 03:56:53 -0700 (PDT) Received: from zen.linaroharston ([51.148.130.216]) by smtp.gmail.com with ESMTPSA id o9sm25681893wrh.46.2019.10.14.03.56.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Oct 2019 03:56:52 -0700 (PDT) Received: from zen.lan (localhost [127.0.0.1]) by zen.linaroharston (Postfix) with ESMTP id 5A1BE1FFD1; Mon, 14 Oct 2019 11:49:59 +0100 (BST) From: =?utf-8?q?Alex_Benn=C3=A9e?= To: qemu-devel@nongnu.org Subject: [PATCH v5 46/55] plugin: add qemu_plugin_insn_disas helper Date: Mon, 14 Oct 2019 11:49:39 +0100 Message-Id: <20191014104948.4291-47-alex.bennee@linaro.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191014104948.4291-1-alex.bennee@linaro.org> References: <20191014104948.4291-1-alex.bennee@linaro.org> MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::341 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: robert.foley@futurewei.com, Richard Henderson , peter.puhov@futurewei.com, aaron@os.amperecomputing.com, cota@braap.org, =?utf-8?q?Alex_Benn?= =?utf-8?b?w6ll?= Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: "Qemu-devel" Give the plugins access to the QEMU dissasembler so they don't have to re-invent the wheel. We generate a warning when there are spare bytes in the decode buffer. This is usually due to the front end loading in more bytes than decoded. Signed-off-by: Alex Bennée Reviewed-by: Richard Henderson --- v5 - fix plugin_printf to use vprintf with va - use __thread storage for string - only decode single instruction for bfd case - don't assert, warn_report when we have spare bytes in insn buffer --- disas.c | 110 +++++++++++++++++++++++++++++++++++ include/disas/disas.h | 2 + include/qemu/qemu-plugin.h | 9 +++ plugins/api.c | 7 +++ plugins/qemu-plugins.symbols | 1 + 5 files changed, 129 insertions(+) -- 2.20.1 diff --git a/disas.c b/disas.c index 3e2bfa572b..02f68e92ab 100644 --- a/disas.c +++ b/disas.c @@ -418,6 +418,7 @@ static bool cap_disas_monitor(disassemble_info *info, uint64_t pc, int count) # define cap_disas_target(i, p, s) false # define cap_disas_host(i, p, s) false # define cap_disas_monitor(i, p, c) false +# define cap_disas_plugin(i, p, c) false #endif /* CONFIG_CAPSTONE */ /* Disassemble this for me please... (debugging). */ @@ -475,6 +476,115 @@ void target_disas(FILE *out, CPUState *cpu, target_ulong code, } } +static __thread GString plugin_disas_output; + +static int plugin_printf(FILE *stream, const char *fmt, ...) +{ + va_list va; + GString *s = &plugin_disas_output; + int initial_len = s->len; + + va_start(va, fmt); + g_string_append_vprintf(s, fmt, va); + va_end(va); + + return s->len - initial_len; +} + +static void plugin_print_address(bfd_vma addr, struct disassemble_info *info) +{ + /* does nothing */ +} + + +#ifdef CONFIG_CAPSTONE +/* Disassemble a single instruction directly into plugin output */ +static +bool cap_disas_plugin(disassemble_info *info, uint64_t pc, size_t size) +{ + uint8_t cap_buf[1024]; + csh handle; + cs_insn *insn; + size_t csize = 0; + int count; + GString *s = &plugin_disas_output; + + if (cap_disas_start(info, &handle) != CS_ERR_OK) { + return false; + } + insn = cap_insn; + + size_t tsize = MIN(sizeof(cap_buf) - csize, size); + const uint8_t *cbuf = cap_buf; + target_read_memory(pc, cap_buf, tsize, info); + + count = cs_disasm(handle, cbuf, size, 0, 1, &insn); + + if (count) { + g_string_printf(s, "%s %s", insn->mnemonic, insn->op_str); + } else { + g_string_printf(s, "cs_disasm failed"); + } + + cs_close(&handle); + return true; +} +#endif + +/* + * We should only be dissembling one instruction at a time here. If + * there is left over it usually indicates the front end has read more + * bytes than it needed. + */ +char * plugin_disas(CPUState *cpu, uint64_t addr, size_t size) +{ + CPUClass *cc = CPU_GET_CLASS(cpu); + int count; + CPUDebug s; + GString *ds = g_string_set_size(&plugin_disas_output, 0); + + g_assert(ds == &plugin_disas_output); + + INIT_DISASSEMBLE_INFO(s.info, NULL, plugin_printf); + + s.cpu = cpu; + s.info.read_memory_func = target_read_memory; + s.info.buffer_vma = addr; + s.info.buffer_length = size; + s.info.print_address_func = plugin_print_address; + s.info.cap_arch = -1; + s.info.cap_mode = 0; + s.info.cap_insn_unit = 4; + s.info.cap_insn_split = 4; + +#ifdef TARGET_WORDS_BIGENDIAN + s.info.endian = BFD_ENDIAN_BIG; +#else + s.info.endian = BFD_ENDIAN_LITTLE; +#endif + + if (cc->disas_set_info) { + cc->disas_set_info(cpu, &s.info); + } + + if (s.info.cap_arch >= 0 && cap_disas_plugin(&s.info, addr, size)) { + return g_strdup(ds->str); + } + + if (s.info.print_insn == NULL) { + s.info.print_insn = print_insn_od_target; + } + + count = s.info.print_insn(addr, &s.info); + + /* The decoder probably read more than it needed it's not critical */ + if (count < size) { + warn_report("%s: %zu bytes left over\n", __func__, size - count); + } + + return g_strdup(ds->str); +} + /* Disassemble this for me please... (debugging). */ void disas(FILE *out, void *code, unsigned long size) { diff --git a/include/disas/disas.h b/include/disas/disas.h index ba47e9197c..8481d4a8b3 100644 --- a/include/disas/disas.h +++ b/include/disas/disas.h @@ -14,6 +14,8 @@ void target_disas(FILE *out, CPUState *cpu, target_ulong code, void monitor_disas(Monitor *mon, CPUState *cpu, target_ulong pc, int nb_insn, int is_physical); +char * plugin_disas(CPUState *cpu, uint64_t addr, size_t size); + /* Look up symbol for debugging purpose. Returns "" if unknown. */ const char *lookup_symbol(target_ulong orig_addr); #endif diff --git a/include/qemu/qemu-plugin.h b/include/qemu/qemu-plugin.h index d9c1ca3b4c..8b403dd615 100644 --- a/include/qemu/qemu-plugin.h +++ b/include/qemu/qemu-plugin.h @@ -324,6 +324,15 @@ qemu_plugin_register_vcpu_syscall_ret_cb(qemu_plugin_id_t id, qemu_plugin_vcpu_syscall_ret_cb_t cb); +/** + * qemu_plugin_insn_disas() - return disassembly string for instruction + * @insn: instruction reference + * + * Returns an allocated string containing the disassembly + */ + +char * qemu_plugin_insn_disas(const struct qemu_plugin_insn *insn); + /** * qemu_plugin_vcpu_for_each() - iterate over the existing vCPU * @id: plugin ID diff --git a/plugins/api.c b/plugins/api.c index fbacd78df6..a9fa229369 100644 --- a/plugins/api.c +++ b/plugins/api.c @@ -40,6 +40,7 @@ #include "sysemu/sysemu.h" #include "tcg/tcg.h" #include "exec/exec-all.h" +#include "disas/disas.h" #include "plugin.h" #ifndef CONFIG_USER_ONLY #include "hw/boards.h" @@ -211,6 +212,12 @@ void *qemu_plugin_insn_haddr(const struct qemu_plugin_insn *insn) return insn->haddr; } +char *qemu_plugin_insn_disas(const struct qemu_plugin_insn *insn) +{ + CPUState *cpu = current_cpu; + return plugin_disas(cpu, insn->vaddr, insn->data->len); +} + /* * The memory queries allow the plugin to query information about a * memory access. diff --git a/plugins/qemu-plugins.symbols b/plugins/qemu-plugins.symbols index 40c0d1abd2..267ec381b4 100644 --- a/plugins/qemu-plugins.symbols +++ b/plugins/qemu-plugins.symbols @@ -25,6 +25,7 @@ qemu_plugin_insn_size; qemu_plugin_insn_vaddr; qemu_plugin_insn_haddr; + qemu_plugin_insn_disas; qemu_plugin_mem_size_shift; qemu_plugin_mem_is_sign_extended; qemu_plugin_mem_is_big_endian;