From patchwork Fri Jul 14 08:25:40 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Llu=C3=ADs_Vilanova?= X-Patchwork-Id: 788187 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3x85QF4GN6z9s75 for ; Fri, 14 Jul 2017 18:27:01 +1000 (AEST) Received: from localhost ([::1]:36146 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dVvwB-0005xv-MS for incoming@patchwork.ozlabs.org; Fri, 14 Jul 2017 04:26:59 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43474) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dVvv8-0005WL-LZ for qemu-devel@nongnu.org; Fri, 14 Jul 2017 04:25:56 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dVvv5-00040f-Dz for qemu-devel@nongnu.org; Fri, 14 Jul 2017 04:25:54 -0400 Received: from roura.ac.upc.edu ([147.83.33.10]:41870 helo=roura.ac.upc.es) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dVvv4-0003yc-To for qemu-devel@nongnu.org; Fri, 14 Jul 2017 04:25:51 -0400 Received: from correu-1.ac.upc.es (correu-1.ac.upc.es [147.83.30.91]) by roura.ac.upc.es (8.13.8/8.13.8) with ESMTP id v6E8PkG1007806; Fri, 14 Jul 2017 10:25:46 +0200 Received: from localhost (unknown [31.210.188.120]) by correu-1.ac.upc.es (Postfix) with ESMTPSA id 54949841; Fri, 14 Jul 2017 10:25:41 +0200 (CEST) From: =?utf-8?b?TGx1w61z?= Vilanova To: qemu-devel@nongnu.org Date: Fri, 14 Jul 2017 11:25:40 +0300 Message-Id: <150002073981.22386.9870422422367410100.stgit@frigg.lan> X-Mailer: git-send-email 2.13.2 In-Reply-To: <150002001195.22386.4679134058536830996.stgit@frigg.lan> References: <150002001195.22386.4679134058536830996.stgit@frigg.lan> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-MIME-Autoconverted: from 8bit to quoted-printable by roura.ac.upc.es id v6E8PkG1007806 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x [fuzzy] X-Received-From: 147.83.33.10 Subject: [Qemu-devel] [PATCH v13 03/26] target: [tcg] Add generic translation framework X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paolo Bonzini , Peter Crosthwaite , "Emilio G. Cota" , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Richard Henderson Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Lluís Vilanova --- accel/tcg/Makefile.objs | 1 accel/tcg/translator.c | 141 +++++++++++++++++++++++++++++++++++++++++++++ include/exec/translator.h | 94 ++++++++++++++++++++++++++++++ 3 files changed, 236 insertions(+) create mode 100644 accel/tcg/translator.c diff --git a/accel/tcg/Makefile.objs b/accel/tcg/Makefile.objs index 70cd474c01..22642e6f75 100644 --- a/accel/tcg/Makefile.objs +++ b/accel/tcg/Makefile.objs @@ -1,3 +1,4 @@ obj-$(CONFIG_SOFTMMU) += tcg-all.o obj-$(CONFIG_SOFTMMU) += cputlb.o obj-y += cpu-exec.o cpu-exec-common.o translate-all.o +obj-y += translator.o diff --git a/accel/tcg/translator.c b/accel/tcg/translator.c new file mode 100644 index 0000000000..630edfd353 --- /dev/null +++ b/accel/tcg/translator.c @@ -0,0 +1,141 @@ +/* + * Generic intermediate code generation. + * + * Copyright (C) 2016-2017 Lluís Vilanova + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + */ + +#include "qemu/osdep.h" +#include "qemu-common.h" +#include "qemu/error-report.h" +#include "cpu.h" +#include "tcg/tcg.h" +#include "tcg/tcg-op.h" +#include "exec/exec-all.h" +#include "exec/gen-icount.h" +#include "exec/log.h" +#include "exec/translator.h" + + +static inline void translate_block_tcg_check(const DisasContextBase *db) +{ + if (tcg_check_temp_count()) { + error_report("warning: TCG temporary leaks before "TARGET_FMT_lx, + db->pc_next); + } +} + +void translator_loop(const TranslatorOps *ops, DisasContextBase *db, + CPUState *cpu, TranslationBlock *tb) +{ + int max_insns; + + /* Initialize DisasContext */ + db->tb = tb; + db->pc_first = tb->pc; + db->pc_next = db->pc_first; + db->is_jmp = DISAS_NEXT; + db->num_insns = 0; + db->singlestep_enabled = cpu->singlestep_enabled; + ops->init_disas_context(db, cpu); + /* should never be set by this hook */ + assert(db->is_jmp == DISAS_NEXT); + + /* Reset the temp count so that we can identify leaks */ + tcg_clear_temp_count(); + + /* Instruction counting */ + max_insns = db->tb->cflags & CF_COUNT_MASK; + if (max_insns == 0) { + max_insns = CF_COUNT_MASK; + } + if (max_insns > TCG_MAX_INSNS) { + max_insns = TCG_MAX_INSNS; + } + if (db->singlestep_enabled || singlestep) { + max_insns = 1; + } + + /* Start translating */ + gen_tb_start(db->tb); + ops->tb_start(db, cpu, &max_insns); + /* should never be set by this hook */ + assert(db->is_jmp == DISAS_NEXT); + + while (true) { + db->num_insns++; + ops->insn_start(db, cpu); + + /* Early exit before breakpoint checks */ + if (unlikely(db->is_jmp != DISAS_NEXT)) { + break; + } + + /* Pass breakpoint hits to target for further processing */ + if (unlikely(!QTAILQ_EMPTY(&cpu->breakpoints))) { + CPUBreakpoint *bp; + QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) { + if (bp->pc == db->pc_next) { + if (ops->breakpoint_check(db, cpu, bp)) { + break; + } + } + } + + if (db->is_jmp == DISAS_NORETURN) { + break; + } + } + + /* Accept I/O on last instruction */ + if (db->num_insns == max_insns && (db->tb->cflags & CF_LAST_IO)) { + gen_io_start(); + } + + /* Disassemble one instruction */ + db->pc_next = ops->translate_insn(db, cpu); + + /**************************************************/ + /* Conditions to stop translation */ + /**************************************************/ + + /* Target-specific conditions set by disassembly */ + if (db->is_jmp != DISAS_NEXT) { + break; + } + + /* Too many instructions */ + if (tcg_op_buf_full() || db->num_insns >= max_insns) { + db->is_jmp = DISAS_TOO_MANY; + break; + } + + translate_block_tcg_check(db); + } + + if ((db->tb->cflags & CF_LAST_IO)) { + gen_io_end(); + } + + ops->tb_stop(db, cpu); + + gen_tb_end(db->tb, db->num_insns); + + translate_block_tcg_check(db); + +#ifdef DEBUG_DISAS + if (qemu_loglevel_mask(CPU_LOG_TB_IN_ASM) + && qemu_log_in_addr_range(db->pc_first)) { + qemu_log_lock(); + qemu_log("----------------\n"); + ops->disas_log(db, cpu); + qemu_log("\n"); + qemu_log_unlock(); + } +#endif + + db->tb->size = db->pc_next - db->pc_first; + db->tb->icount = db->num_insns; +} diff --git a/include/exec/translator.h b/include/exec/translator.h index b51b8f8a4e..3806e01d8b 100644 --- a/include/exec/translator.h +++ b/include/exec/translator.h @@ -10,6 +10,19 @@ #ifndef EXEC__TRANSLATOR_H #define EXEC__TRANSLATOR_H +/* + * Include this header from a target-specific file, and add a + * + * DisasContextBase base; + * + * member in your target-specific DisasContext. + */ + + +#include "exec/exec-all.h" +#include "tcg/tcg.h" + + /** * DisasJumpType: * @DISAS_NEXT: Next instruction in program order. @@ -37,4 +50,85 @@ typedef enum DisasJumpType { DISAS_TARGET_11, } DisasJumpType; +/** + * DisasContextBase: + * @tb: Translation block for this disassembly. + * @pc_first: Address of first guest instruction in this TB. + * @pc_next: Address of next guest instruction in this TB (current during + * disassembly). + * @is_jmp: What instruction to disassemble next. + * @num_insns: Number of translated instructions (including current). + * @singlestep_enabled: "Hardware" single stepping enabled. + * + * Architecture-agnostic disassembly context. + */ +typedef struct DisasContextBase { + TranslationBlock *tb; + target_ulong pc_first; + target_ulong pc_next; + DisasJumpType is_jmp; + unsigned int num_insns; + bool singlestep_enabled; +} DisasContextBase; + +/** + * TranslatorOps: + * @init_disas_context: Initialize a DisasContext struct (DisasContextBase has + * already been initialized). + * @tb_start: Start translating a new TB. Can override the maximum number of + * instructions to translate, as calculated by the generic code in + * translator_loop(). + * @insn_start: Start translating a new instruction. + * @breakpoint_check: Check if a breakpoint did hit, in which case no more + * breakpoints are checked. When called, the breakpoint has + * already been checked to match the PC, but targets can + * decide the breakpoint missed the address (e.g., due to + * conditions encoded in their flags). + * @translate_insn: Disassemble one instruction and return the PC for the next + * one. Can set db->is_jmp to DISAS_TARGET or above to stop + * translation. + * @tb_stop: Stop translating a TB. + * @disas_log: Print instruction disassembly to log. + * + * Target-specific operations for the generic translator loop. + * + * The following hooks can set DisasContextBase::is_jmp to stop the translation + * loop: + * + * - insn_start(), translate_insn() + * -> is_jmp != DISAS_NEXT + * + * - insn_start(), breakpoint_check(), translate_insn() + * -> is_jmp == DISAS_NORETURN + */ +typedef struct TranslatorOps { + void (*init_disas_context)(DisasContextBase *db, CPUState *cpu); + void (*tb_start)(DisasContextBase *db, CPUState *cpu, int *max_insns); + void (*insn_start)(DisasContextBase *db, CPUState *cpu); + bool (*breakpoint_check)(DisasContextBase *db, CPUState *cpu, + const CPUBreakpoint *bp); + target_ulong (*translate_insn)(DisasContextBase *db, CPUState *cpu); + void (*tb_stop)(DisasContextBase *db, CPUState *cpu); + void (*disas_log)(const DisasContextBase *db, CPUState *cpu); +} TranslatorOps; + +/** + * translator_loop: + * @ops: Target-specific operations. + * @db: Disassembly context. + * @cpu: Target vCPU. + * @tb: Translation block. + * + * Generic translator loop. + * + * Translation will stop in the following cases (in order): + * - When set by #TranslatorOps::insn_start. + * - When set by #TranslatorOps::translate_insn. + * - When the TCG operation buffer is full. + * - When single-stepping is enabled (system-wide or on the current vCPU). + * - When too many instructions have been translated. + */ +void translator_loop(const TranslatorOps *ops, DisasContextBase *db, + CPUState *cpu, TranslationBlock *tb); + #endif /* EXEC__TRANSLATOR_H */