unicorn/qemu/include/exec/gen-icount.h
Richard Henderson 1547048a22
tcg: Reorg TCGOp chaining
Instead of using -1 as end of chain, use 0, and link through the 0
entry as a fully circular double-linked list.

Backports commit dcb8e75870e2de199db853697f8839cb603beefe from qemu
2018-02-25 21:44:50 -05:00

87 lines
2.6 KiB
C

#ifndef GEN_ICOUNT_H
#define GEN_ICOUNT_H
#include "qemu/timer.h"
/* Helpers for instruction counting code generation. */
//static int icount_start_insn_idx
//static TCGLabel *icount_label;
//static TCGLabel *exitreq_label;
static inline void gen_tb_start(TCGContext *tcg_ctx)
{
//TCGv_i32 count, flag, imm;
TCGv_i32 flag;
tcg_ctx->exitreq_label = gen_new_label(tcg_ctx);
flag = tcg_temp_new_i32(tcg_ctx);
tcg_gen_ld_i32(tcg_ctx, flag, tcg_ctx->cpu_env,
offsetof(CPUState, tcg_exit_req) - ENV_OFFSET);
tcg_gen_brcondi_i32(tcg_ctx, TCG_COND_NE, flag, 0, tcg_ctx->exitreq_label);
tcg_temp_free_i32(tcg_ctx, flag);
#if 0
if (!(s->tb->cflags & CF_USE_ICOUNT)) {
return;
}
icount_label = gen_new_label(tcg_ctx);
count = tcg_temp_local_new_i32(tcg_ctx);
tcg_gen_ld_i32(tcg_ctx, count, cpu_env,
-ENV_OFFSET + offsetof(CPUState, icount_decr.u32));
imm = tcg_temp_new_i32(tcg_ctx);
/* We emit a movi with a dummy immediate argument. Keep the insn index
* of the movi so that we later (when we know the actual insn count)
* can update the immediate argument with the actual insn count. */
icount_start_insn_idx = tcg_op_buf_count(tcg_ctx);
tcg_gen_movi_i32(tcg_ctx, imm, 0xdeadbeef);
tcg_gen_sub_i32(tcg_ctx, count, count, imm);
tcg_temp_free_i32(tcg_ctx, imm);
tcg_gen_brcondi_i32(tcg_ctx, TCG_COND_LT, count, 0, icount_label);
tcg_gen_st16_i32(tcg_ctx, count, cpu_env,
-ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
tcg_temp_free_i32(tcg_ctx, count);
#endif
}
static inline void gen_tb_end(TCGContext *tcg_ctx, TranslationBlock *tb, int num_insns)
{
gen_set_label(tcg_ctx, tcg_ctx->exitreq_label);
tcg_gen_exit_tb(tcg_ctx, (uintptr_t)tb + TB_EXIT_REQUESTED);
#if 0
if (use_icount) {
/* Update the num_insn immediate parameter now that we know
* the actual insn count. */
tcg_set_insn_param(tcg_ctx, icount_start_insn_idx, 1, num_insns);
gen_set_label(icount_label);
tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED);
}
#endif
/* Terminate the linked list. */
tcg_ctx->gen_op_buf[tcg_ctx->gen_op_buf[0].prev].next = 0;
}
#if 0
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
#endif