42a268c241
This is improved type checking for the translators -- it's no longer possible to accidentally swap arguments to the branch functions. Note that the code generating backends still manipulate labels as int. With notable exceptions, the scope of the change is just a few lines for each target, so it's not worth building extra machinery to do this change in per-target increments. Cc: Peter Maydell <peter.maydell@linaro.org> Cc: Edgar E. Iglesias <edgar.iglesias@gmail.com> Cc: Michael Walle <michael@walle.cc> Cc: Leon Alrae <leon.alrae@imgtec.com> Cc: Anthony Green <green@moxielogic.com> Cc: Jia Liu <proljc@gmail.com> Cc: Alexander Graf <agraf@suse.de> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: Blue Swirl <blauwirbel@gmail.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Reviewed-by: Bastian Koppelmann <kbastian@mail.uni-paderborn.de> Signed-off-by: Richard Henderson <rth@twiddle.net>
80 lines
2.1 KiB
C
80 lines
2.1 KiB
C
#ifndef GEN_ICOUNT_H
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#define GEN_ICOUNT_H 1
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#include "qemu/timer.h"
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/* Helpers for instruction counting code generation. */
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static TCGArg *icount_arg;
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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(TranslationBlock *tb)
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{
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TCGv_i32 count, flag, imm;
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int i;
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exitreq_label = gen_new_label();
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flag = tcg_temp_new_i32();
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tcg_gen_ld_i32(flag, cpu_env,
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offsetof(CPUState, tcg_exit_req) - ENV_OFFSET);
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tcg_gen_brcondi_i32(TCG_COND_NE, flag, 0, exitreq_label);
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tcg_temp_free_i32(flag);
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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();
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count = tcg_temp_local_new_i32();
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tcg_gen_ld_i32(count, cpu_env,
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-ENV_OFFSET + offsetof(CPUState, icount_decr.u32));
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imm = tcg_temp_new_i32();
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tcg_gen_movi_i32(imm, 0xdeadbeef);
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/* This is a horrid hack to allow fixing up the value later. */
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i = tcg_ctx.gen_last_op_idx;
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i = tcg_ctx.gen_op_buf[i].args;
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icount_arg = &tcg_ctx.gen_opparam_buf[i + 1];
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tcg_gen_sub_i32(count, count, imm);
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tcg_temp_free_i32(imm);
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tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label);
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tcg_gen_st16_i32(count, cpu_env,
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-ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low));
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tcg_temp_free_i32(count);
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}
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static void gen_tb_end(TranslationBlock *tb, int num_insns)
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{
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gen_set_label(exitreq_label);
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tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED);
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if (tb->cflags & CF_USE_ICOUNT) {
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*icount_arg = num_insns;
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gen_set_label(icount_label);
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tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED);
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}
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/* Terminate the linked list. */
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tcg_ctx.gen_op_buf[tcg_ctx.gen_last_op_idx].next = -1;
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}
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static inline void gen_io_start(void)
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{
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TCGv_i32 tmp = tcg_const_i32(1);
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tcg_gen_st_i32(tmp, cpu_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
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tcg_temp_free_i32(tmp);
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}
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static inline void gen_io_end(void)
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{
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TCGv_i32 tmp = tcg_const_i32(0);
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tcg_gen_st_i32(tmp, cpu_env, -ENV_OFFSET + offsetof(CPUState, can_do_io));
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tcg_temp_free_i32(tmp);
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}
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#endif
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