qemu/include/exec/gen-icount.h
Richard Henderson c45cb8bb89 tcg: Put opcodes in a linked list
The previous setup required ops and args to be completely sequential,
and was error prone when it came to both iteration and optimization.

Reviewed-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
Signed-off-by: Richard Henderson <rth@twiddle.net>
2015-02-12 21:21:38 -08:00

80 lines
2.1 KiB
C

#ifndef GEN_ICOUNT_H
#define GEN_ICOUNT_H 1
#include "qemu/timer.h"
/* Helpers for instruction counting code generation. */
static TCGArg *icount_arg;
static int icount_label;
static int exitreq_label;
static inline void gen_tb_start(TranslationBlock *tb)
{
TCGv_i32 count, flag, imm;
int i;
exitreq_label = gen_new_label();
flag = tcg_temp_new_i32();
tcg_gen_ld_i32(flag, cpu_env,
offsetof(CPUState, tcg_exit_req) - ENV_OFFSET);
tcg_gen_brcondi_i32(TCG_COND_NE, flag, 0, exitreq_label);
tcg_temp_free_i32(flag);
if (!(tb->cflags & CF_USE_ICOUNT)) {
return;
}
icount_label = gen_new_label();
count = tcg_temp_local_new_i32();
tcg_gen_ld_i32(count, cpu_env,
-ENV_OFFSET + offsetof(CPUState, icount_decr.u32));
imm = tcg_temp_new_i32();
tcg_gen_movi_i32(imm, 0xdeadbeef);
/* This is a horrid hack to allow fixing up the value later. */
i = tcg_ctx.gen_last_op_idx;
i = tcg_ctx.gen_op_buf[i].args;
icount_arg = &tcg_ctx.gen_opparam_buf[i + 1];
tcg_gen_sub_i32(count, count, imm);
tcg_temp_free_i32(imm);
tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
tcg_gen_st16_i32(count, cpu_env,
-ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
tcg_temp_free_i32(count);
}
static void gen_tb_end(TranslationBlock *tb, int num_insns)
{
gen_set_label(exitreq_label);
tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED);
if (tb->cflags & CF_USE_ICOUNT) {
*icount_arg = num_insns;
gen_set_label(icount_label);
tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED);
}
/* Terminate the linked list. */
tcg_ctx.gen_op_buf[tcg_ctx.gen_last_op_idx].next = -1;
}
static inline void gen_io_start(void)
{
TCGv_i32 tmp = tcg_const_i32(1);
tcg_gen_st_i32(tmp, cpu_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
tcg_temp_free_i32(tmp);
}
static inline void gen_io_end(void)
{
TCGv_i32 tmp = tcg_const_i32(0);
tcg_gen_st_i32(tmp, cpu_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
tcg_temp_free_i32(tmp);
}
#endif