c5a49c63fa
Convert all existing readers of tb->cflags to tb_cflags, so that we use atomic_read and therefore avoid undefined behaviour in C11. Note that the remaining setters/getters of the field are protected by tb_lock, and therefore do not need conversion. Luckily all readers access the field via 'tb->cflags' (so no foo.cflags, bar->cflags in the code base), which makes the conversion easily scriptable: FILES=$(git grep 'tb->cflags' target include/exec/gen-icount.h \ accel/tcg/translator.c | cut -f1 -d':' | sort | uniq) perl -pi -e 's/([^.>])tb->cflags/$1tb_cflags(tb)/g' $FILES perl -pi -e 's/([a-z->.]*)(->|\.)tb->cflags/tb_cflags($1$2tb)/g' $FILES Then manually fixed the few errors that checkpatch reported. Compile-tested for all targets. Suggested-by: Richard Henderson <rth@twiddle.net> Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
139 lines
4.4 KiB
C
139 lines
4.4 KiB
C
/*
|
|
* 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 = tb_cflags(db->tb) & 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 && (tb_cflags(db->tb) & 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
|
|
}
|