From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41150) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dQC9Y-0006xk-9h for qemu-devel@nongnu.org; Wed, 28 Jun 2017 08:33:08 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dQC9U-0000ZG-A5 for qemu-devel@nongnu.org; Wed, 28 Jun 2017 08:33:04 -0400 Received: from roura.ac.upc.es ([147.83.33.10]:53633) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dQC9T-0000Yw-PV for qemu-devel@nongnu.org; Wed, 28 Jun 2017 08:33:00 -0400 From: =?utf-8?b?TGx1w61z?= Vilanova Date: Wed, 28 Jun 2017 15:32:48 +0300 Message-Id: <149865316837.17063.1608754834009945976.stgit@frigg.lan> In-Reply-To: <149865219962.17063.10630533069463266646.stgit@frigg.lan> References: <149865219962.17063.10630533069463266646.stgit@frigg.lan> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Subject: [Qemu-devel] [PATCH v11 04/29] target: [tcg] Add generic translation framework List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: "Emilio G. Cota" , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Richard Henderson , Peter Crosthwaite , Paolo Bonzini Signed-off-by: Llu=C3=ADs Vilanova --- accel/tcg/Makefile.objs | 1=20 accel/tcg/translator.c | 153 +++++++++++++++++++++++++++++++++++++++= ++++++ include/exec/gen-icount.h | 2 - include/exec/translator.h | 104 +++++++++++++++++++++++++++++++ 4 files changed, 259 insertions(+), 1 deletion(-) create mode 100644 accel/tcg/translator.c diff --git a/accel/tcg/Makefile.objs b/accel/tcg/Makefile.objs index f173cd5397..3a5da5357c 100644 --- a/accel/tcg/Makefile.objs +++ b/accel/tcg/Makefile.objs @@ -1,3 +1,4 @@ obj-$(CONFIG_SOFTMMU) +=3D tcg-all.o obj-$(CONFIG_SOFTMMU) +=3D cputlb.o obj-y +=3D cpu-exec.o cpu-exec-common.o translate-all.o translate-common= .o +obj-y +=3D translator.o diff --git a/accel/tcg/translator.c b/accel/tcg/translator.c new file mode 100644 index 0000000000..b941ebdc62 --- /dev/null +++ b/accel/tcg/translator.c @@ -0,0 +1,153 @@ +/* + * Generic intermediate code generation. + * + * Copyright (C) 2016-2017 Llu=C3=ADs Vilanova + * + * This work is licensed under the terms of the GNU GPL, version 2 or la= ter. + * 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 translate_block(const TranslatorOps *ops, DisasContextBase *db, + CPUState *cpu, TranslationBlock *tb) +{ + int max_insns; + + /* Initialize DisasContext */ + db->tb =3D tb; + db->pc_first =3D tb->pc; + db->pc_next =3D db->pc_first; + db->is_jmp =3D DISAS_NEXT; + db->num_insns =3D 0; + db->singlestep_enabled =3D cpu->singlestep_enabled; + ops->init_disas_context(db, cpu); + + /* Initialize globals */ + ops->init_globals(db, cpu); + tcg_clear_temp_count(); + + /* Instruction counting */ + max_insns =3D db->tb->cflags & CF_COUNT_MASK; + if (max_insns =3D=3D 0) { + max_insns =3D CF_COUNT_MASK; + } + if (max_insns > TCG_MAX_INSNS) { + max_insns =3D TCG_MAX_INSNS; + } + if (db->singlestep_enabled || singlestep) { + max_insns =3D 1; + } + + /* Start translating */ + gen_tb_start(db->tb); + ops->tb_start(db, cpu); + + while (true) { + db->num_insns++; + ops->insn_start(db, cpu); + + /* Early exit before breakpoint checks */ + if (unlikely(db->is_jmp !=3D 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 =3D=3D db->pc_next) { + BreakpointCheckType bp_check =3D + ops->breakpoint_check(db, cpu, bp); + switch (bp_check) { + case BC_MISS: + /* Target ignored this breakpoint, go to next */ + break; + case BC_HIT_INSN: + /* Hit, keep translating */ + /* + * TODO: if we're never going to have more than = one + * BP in a single address, we can simply u= se a + * bool here. + */ + goto done_breakpoints; + case BC_HIT_TB: + /* Hit, end TB */ + goto done_generating; + default: + g_assert_not_reached(); + } + } + } + } + done_breakpoints: + + /* Accept I/O on last instruction */ + if (db->num_insns =3D=3D max_insns && (db->tb->cflags & CF_LAST_= IO)) { + gen_io_start(); + } + + /* Disassemble one instruction */ + db->pc_next =3D ops->translate_insn(db, cpu); + + /**************************************************/ + /* Conditions to stop translation */ + /**************************************************/ + + /* Target-specific conditions set by disassembly */ + if (db->is_jmp !=3D DISAS_NEXT) { + break; + } + + /* Too many instructions */ + if (tcg_op_buf_full() || db->num_insns >=3D max_insns) { + db->is_jmp =3D DISAS_TOO_MANY; + break; + } + + translate_block_tcg_check(db); + } + + ops->tb_stop(db, cpu); + + if (db->tb->cflags & CF_LAST_IO) { + gen_io_end(); + } + +done_generating: + 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 =3D db->pc_next - db->pc_first; + db->tb->icount =3D db->num_insns; +} diff --git a/include/exec/gen-icount.h b/include/exec/gen-icount.h index 3fb17d435a..d66ca09f60 100644 --- a/include/exec/gen-icount.h +++ b/include/exec/gen-icount.h @@ -44,7 +44,7 @@ static inline void gen_tb_start(TranslationBlock *tb) tcg_temp_free_i32(count); } =20 -static void gen_tb_end(TranslationBlock *tb, int num_insns) +static inline void gen_tb_end(TranslationBlock *tb, int num_insns) { if (tb->cflags & CF_USE_ICOUNT) { /* Update the num_insn immediate parameter now that we know diff --git a/include/exec/translator.h b/include/exec/translator.h index 1ffab03a53..c6fe64f988 100644 --- a/include/exec/translator.h +++ b/include/exec/translator.h @@ -10,6 +10,38 @@ #ifndef EXEC__TRANSLATOR_H #define EXEC__TRANSLATOR_H =20 +/* + * 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" + + +/** + * BreakpointCheckType: + * @BC_MISS: No hit + * @BC_HIT_INSN: Hit, but continue translating TB + * @BC_HIT_TB: Hit, stop translating TB + * + * How to react to a breakpoint. A hit means no more breakpoints will be= checked + * for the current instruction. + * + * Not all breakpoints associated to an address are necessarily raised b= y + * targets (e.g., due to conditions encoded in their flags), so tey can = decide + * that a breakpoint missed the address (@BP_MISS). + */ +typedef enum BreakpointCheckType { + BC_MISS, + BC_HIT_INSN, + BC_HIT_TB, +} BreakpointCheckType; + /** * DisasJumpType: * @DISAS_NEXT: Next instruction in program order. @@ -33,6 +65,78 @@ typedef enum DisasJumpType { DISAS_TARGET_9, DISAS_TARGET_10, DISAS_TARGET_11, + DISAS_TARGET_12, + DISAS_TARGET_13, + DISAS_TARGET_14, } DisasJumpType; =20 +/** + * 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 durin= g + * 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 (DisasContextBa= se has + * already been initialized). + * @init_globals: Initialize global variables. + * @tb_start: Start translating a new TB. + * @insn_start: Start translating a new instruction. + * @breakpoint_check: Check if a breakpoint did hit. When called, the br= eakpoint + * has already been checked to match the PC. + * @disas_insn: Disassemble one instruction an return the PC for the nex= t + * one. Can set db->is_jmp to DJ_TARGET or above to stop + * translation. + * @tb_stop: Stop translating a TB. + * @disas_flags: Get flags argument for log_target_disas(). + * + * Target-specific operations for the generic translator loop. + */ +typedef struct TranslatorOps { + void (*init_disas_context)(DisasContextBase *db, CPUState *cpu); + void (*init_globals)(DisasContextBase *db, CPUState *cpu); + void (*tb_start)(DisasContextBase *db, CPUState *cpu); + void (*insn_start)(DisasContextBase *db, CPUState *cpu); + BreakpointCheckType (*breakpoint_check)(DisasContextBase *db, CPUSta= te *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; + +/** + * translate_block: + * @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 translate_block(const TranslatorOps *ops, DisasContextBase *db, + CPUState *cpu, TranslationBlock *tb); + #endif /* EXEC__TRANSLATOR_H */