unicorn/qemu/include/exec/gen-icount.h

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#ifndef GEN_ICOUNT_H
#define GEN_ICOUNT_H
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#include "qemu/timer.h"
/* Helpers for instruction counting code generation. */
//static TCGOp *icount_start_insn;
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static inline void gen_tb_start(TCGContext *tcg_ctx, TranslationBlock *tb)
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{
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//TCGv_i32 count, imm;
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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
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tcg_ctx->exitreq_label = gen_new_label();
if (tb_cflags(tb) & CF_USE_ICOUNT) {
count = tcg_temp_local_new_i32(tcg_ctx);
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} else {
count = tcg_temp_new_i32(tcg_ctx);
}
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tcg_gen_ld_i32(tcg_ctx, count, tcg_ctx->cpu_env,
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-ENV_OFFSET + offsetof(CPUState, icount_decr.u32));
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if (tb_cflags(tb) & CF_USE_ICOUNT) {
imm = tcg_temp_new_i32(tcg_ctx);
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/* 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. */
tcg_gen_movi_i32(tcg_ctx, imm, 0xdeadbeef);
icount_start_insn = tcg_last_op(tcg_ctx);
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tcg_gen_sub_i32(tcg_ctx, count, count, imm);
tcg_temp_free_i32(tcg_ctx, imm);
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}
tcg_gen_brcondi_i32(tcg_ctx, TCG_COND_LT, count, 0, tcg_ctx->exitreq_label);
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if (tb_cflags(tb) & CF_USE_ICOUNT) {
tcg_gen_st16_i32(tcg_ctx, count, tcg_ctx, cpu_env,
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-ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
}
tcg_temp_free_i32(tcg_ctx, count);
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#endif
}
static inline void gen_tb_end(TCGContext *tcg_ctx, TranslationBlock *tb, int num_insns)
{
#if 0
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if (tb_cflags(tb) & CF_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, 1, num_insns);
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}
#endif
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gen_set_label(tcg_ctx, tcg_ctx->exitreq_label);
tcg_gen_exit_tb(tcg_ctx, tb, TB_EXIT_REQUESTED);
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}
#if 0
static inline void gen_io_start(TCGContext *tcg_ctx)
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{
TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 1);
tcg_gen_st_i32(tcg_ctx, tmp, tcg_ctx->tcg_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
tcg_temp_free_i32(tcg_ctx, tmp);
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}
static inline void gen_io_end(TCGContext *tcg_ctx)
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{
TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 0);
tcg_gen_st_i32(tcg_ctx, tmp, tcg_ctx->tcg_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
tcg_temp_free_i32(tcg_ctx, tmp);
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}
#endif
#endif