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tcg: Add generic translation framework
Reviewed-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu> Message-Id: <150002073981.22386.9870422422367410100.stgit@frigg.lan> [rth: Moved max_insns adjustment from tb_start to init_disas_context. Removed pc_next return from translate_insn. Removed tcg_check_temp_count from generic loop. Moved gen_io_end to exactly match gen_io_start. Use qemu_log instead of error_report for temporary leaks. Moved TB size/icount assignments before disas_log.] Signed-off-by: Richard Henderson <rth@twiddle.net>
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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 |
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/* | ||
* 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. | ||
*/ | ||
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#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" | ||
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/* 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); | ||
} | ||
} | ||
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void translator_loop(const TranslatorOps *ops, DisasContextBase *db, | ||
CPUState *cpu, TranslationBlock *tb) | ||
{ | ||
int max_insns; | ||
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/* 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; | ||
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/* 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; | ||
} | ||
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max_insns = ops->init_disas_context(db, cpu, max_insns); | ||
tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */ | ||
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/* Reset the temp count so that we can identify leaks */ | ||
tcg_clear_temp_count(); | ||
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/* Start translating. */ | ||
gen_tb_start(db->tb); | ||
ops->tb_start(db, cpu); | ||
tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */ | ||
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while (true) { | ||
db->num_insns++; | ||
ops->insn_start(db, cpu); | ||
tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */ | ||
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/* 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; | ||
} | ||
} | ||
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/* 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); | ||
} | ||
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/* Stop translation if translate_insn so indicated. */ | ||
if (db->is_jmp != DISAS_NEXT) { | ||
break; | ||
} | ||
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/* 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; | ||
} | ||
} | ||
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/* 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); | ||
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/* 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; | ||
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#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 | ||
} |
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