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-rw-r--r--accel/tcg/Makefile.objs1
-rw-r--r--accel/tcg/translator.c138
-rw-r--r--include/exec/translator.h104
3 files changed, 243 insertions, 0 deletions
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..afa3af478a
--- /dev/null
+++ b/accel/tcg/translator.c
@@ -0,0 +1,138 @@
+/*
+ * Generic intermediate code generation.
+ *
+ * Copyright (C) 2016-2017 Lluís Vilanova <vilanova@ac.upc.edu>
+ *
+ * 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"
+
+/* Pairs with tcg_clear_temp_count.
+ To be called by #TranslatorOps.{translate_insn,tb_stop} if
+ (1) the target is sufficiently clean to support reporting,
+ (2) as and when all temporaries are known to be consumed.
+ For most targets, (2) is at the end of translate_insn. */
+void translator_loop_temp_check(DisasContextBase *db)
+{
+ if (tcg_check_temp_count()) {
+ qemu_log("warning: TCG temporary leaks before "
+ TARGET_FMT_lx "\n", 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;
+
+ /* 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;
+ }
+
+ max_insns = ops->init_disas_context(db, cpu, max_insns);
+ tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
+
+ /* Reset the temp count so that we can identify leaks */
+ tcg_clear_temp_count();
+
+ /* Start translating. */
+ gen_tb_start(db->tb);
+ ops->tb_start(db, cpu);
+ tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
+
+ while (true) {
+ db->num_insns++;
+ ops->insn_start(db, cpu);
+ tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
+
+ /* 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;
+ }
+ }
+ }
+ /* The breakpoint_check hook may use DISAS_TOO_MANY to indicate
+ that only one more instruction is to be executed. Otherwise
+ it should use DISAS_NORETURN when generating an exception,
+ but may use a DISAS_TARGET_* value for Something Else. */
+ if (db->is_jmp > DISAS_TOO_MANY) {
+ break;
+ }
+ }
+
+ /* Disassemble one instruction. The translate_insn hook should
+ update db->pc_next and db->is_jmp to indicate what should be
+ done next -- either exiting this loop or locate the start of
+ the next instruction. */
+ if (db->num_insns == max_insns && (db->tb->cflags & CF_LAST_IO)) {
+ /* Accept I/O on the last instruction. */
+ gen_io_start();
+ ops->translate_insn(db, cpu);
+ gen_io_end();
+ } else {
+ ops->translate_insn(db, cpu);
+ }
+
+ /* Stop translation if translate_insn so indicated. */
+ if (db->is_jmp != DISAS_NEXT) {
+ break;
+ }
+
+ /* Stop translation if the output buffer is full,
+ or we have executed all of the allowed instructions. */
+ if (tcg_op_buf_full() || db->num_insns >= max_insns) {
+ db->is_jmp = DISAS_TOO_MANY;
+ break;
+ }
+ }
+
+ /* Emit code to exit the TB, as indicated by db->is_jmp. */
+ ops->tb_stop(db, cpu);
+ gen_tb_end(db->tb, db->num_insns);
+
+ /* The disas_log hook may use these values rather than recompute. */
+ db->tb->size = db->pc_next - db->pc_first;
+ db->tb->icount = db->num_insns;
+
+#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
+}
diff --git a/include/exec/translator.h b/include/exec/translator.h
index b51b8f8a4e..e2dc2a04ae 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 +50,95 @@ 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 the target-specific portions of DisasContext struct.
+ * The generic DisasContextBase has already been initialized.
+ * Return max_insns, modified as necessary by db->tb->flags.
+ *
+ * @tb_start:
+ * Emit any code required before the start of the main loop,
+ * after the generic gen_tb_start().
+ *
+ * @insn_start:
+ * Emit the tcg_gen_insn_start opcode.
+ *
+ * @breakpoint_check:
+ * When called, the breakpoint has already been checked to match the PC,
+ * but the target may decide the breakpoint missed the address
+ * (e.g., due to conditions encoded in their flags). Return true to
+ * indicate that the breakpoint did hit, in which case no more breakpoints
+ * are checked. If the breakpoint did hit, emit any code required to
+ * signal the exception, and set db->is_jmp as necessary to terminate
+ * the main loop.
+ *
+ * @translate_insn:
+ * Disassemble one instruction and set db->pc_next for the start
+ * of the following instruction. Set db->is_jmp as necessary to
+ * terminate the main loop.
+ *
+ * @tb_stop:
+ * Emit any opcodes required to exit the TB, based on db->is_jmp.
+ *
+ * @disas_log:
+ * Print instruction disassembly to log.
+ */
+typedef struct TranslatorOps {
+ int (*init_disas_context)(DisasContextBase *db, CPUState *cpu,
+ int max_insns);
+ void (*tb_start)(DisasContextBase *db, CPUState *cpu);
+ void (*insn_start)(DisasContextBase *db, CPUState *cpu);
+ bool (*breakpoint_check)(DisasContextBase *db, CPUState *cpu,
+ const CPUBreakpoint *bp);
+ void (*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 is_jmp set by #TranslatorOps::breakpoint_check.
+ * - set to DISAS_TOO_MANY exits after translating one more insn
+ * - set to any other value than DISAS_NEXT exits immediately.
+ * - When is_jmp set by #TranslatorOps::translate_insn.
+ * - set to any value other than DISAS_NEXT exits immediately.
+ * - 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);
+
+void translator_loop_temp_check(DisasContextBase *db);
+
#endif /* EXEC__TRANSLATOR_H */
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-04 13:43:45 +0000