mirror of
https://github.com/yuzu-emu/unicorn.git
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7fe5f620df
With no fixed array allocation, we can't overflow a buffer. This will be important as optimizations related to host vectors may expand the number of ops used. Use QTAILQ to link the ops together. Backports commit 15fa08f8451babc88d733bd411d4c94976f9d0f8 from qemu
83 lines
2.7 KiB
C
83 lines
2.7 KiB
C
#ifndef GEN_ICOUNT_H
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#define GEN_ICOUNT_H
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#include "qemu/timer.h"
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/* Helpers for instruction counting code generation. */
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//static TCGOp *icount_start_insn;
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//static TCGLabel *icount_label;
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//static TCGLabel *exitreq_label;
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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, flag, imm;
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TCGv_i32 flag;
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tcg_ctx->exitreq_label = gen_new_label(tcg_ctx);
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flag = tcg_temp_new_i32(tcg_ctx);
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tcg_gen_ld_i32(tcg_ctx, flag, tcg_ctx->cpu_env,
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offsetof(CPUState, tcg_exit_req) - ENV_OFFSET);
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tcg_gen_brcondi_i32(tcg_ctx, TCG_COND_NE, flag, 0, tcg_ctx->exitreq_label);
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tcg_temp_free_i32(tcg_ctx, flag);
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#if 0
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if (!(tb->cflags & CF_USE_ICOUNT))
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return;
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}
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icount_label = gen_new_label(tcg_ctx);
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count = tcg_temp_local_new_i32(tcg_ctx);
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tcg_gen_ld_i32(tcg_ctx, count, tcg_ctx->tcg_env,
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-ENV_OFFSET + offsetof(CPUState, icount_decr.u32));
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imm = tcg_temp_new_i32(tcg_ctx);
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/* We emit a movi with a dummy immediate argument. Keep the insn index
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* of the movi so that we later (when we know the actual insn count)
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* can update the immediate argument with the actual insn count. */
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icount_start_insn = tcg_last_op(tcg_ctx);
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tcg_gen_movi_i32(tcg_ctx, imm, 0xdeadbeef);
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tcg_gen_sub_i32(tcg_ctx, count, count, imm);
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tcg_temp_free_i32(tcg_ctx, imm);
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tcg_gen_brcondi_i32(tcg_ctx, TCG_COND_LT, count, 0, icount_label);
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tcg_gen_st16_i32(tcg_ctx, count, tcg_ctx->tcg_env,
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-ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
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tcg_temp_free_i32(tcg_ctx, count);
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#endif
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}
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static inline void gen_tb_end(TCGContext *tcg_ctx, TranslationBlock *tb, int num_insns)
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{
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gen_set_label(tcg_ctx, tcg_ctx->exitreq_label);
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tcg_gen_exit_tb(tcg_ctx, (uintptr_t)tb + TB_EXIT_REQUESTED);
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#if 0
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if (tb->cflags & CF_USE_ICOUNT) {
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/* Update the num_insn immediate parameter now that we know
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* the actual insn count. */
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tcg_set_insn_param(tcg_ctx->icount_start_insn, 1, num_insns);
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gen_set_label(tcg_ctx, icount_label);
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tcg_gen_exit_tb(tcg_ctx, (uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED);
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}
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#endif
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}
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#if 0
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static inline void gen_io_start(TCGContext *tcg_ctx)
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{
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TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 1);
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tcg_gen_st_i32(tcg_ctx, tmp, tcg_ctx->tcg_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
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tcg_temp_free_i32(tcg_ctx, tmp);
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}
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static inline void gen_io_end(TCGContext *tcg_ctx)
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{
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TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 0);
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tcg_gen_st_i32(tcg_ctx, tmp, tcg_ctx->tcg_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
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tcg_temp_free_i32(tcg_ctx, tmp);
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}
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#endif
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#endif
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