70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
#ifndef GEN_ICOUNT_H
|
|
#define GEN_ICOUNT_H
|
|
|
|
#include "qemu/timer.h"
|
|
|
|
/* Helpers for instruction counting code generation. */
|
|
|
|
static inline void gen_io_start(TCGContext *tcg_ctx)
|
|
{
|
|
TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 1);
|
|
tcg_gen_st_i32(tcg_ctx, tmp, tcg_ctx->cpu_env,
|
|
offsetof(ArchCPU, parent_obj.can_do_io) -
|
|
offsetof(ArchCPU, env));
|
|
tcg_temp_free_i32(tcg_ctx, tmp);
|
|
}
|
|
|
|
/*
|
|
* cpu->can_do_io is cleared automatically at the beginning of
|
|
* each translation block. The cost is minimal and only paid
|
|
* for -icount, plus it would be very easy to forget doing it
|
|
* in the translator. Therefore, backends only need to call
|
|
* gen_io_start.
|
|
*/
|
|
static inline void gen_io_end(TCGContext *tcg_ctx)
|
|
{
|
|
TCGv_i32 tmp = tcg_const_i32(tcg_ctx, 0);
|
|
tcg_gen_st_i32(tcg_ctx, tmp, tcg_ctx->cpu_env,
|
|
offsetof(ArchCPU, parent_obj.can_do_io) -
|
|
offsetof(ArchCPU, env));
|
|
tcg_temp_free_i32(tcg_ctx, tmp);
|
|
}
|
|
|
|
static inline void gen_tb_start(TCGContext *tcg_ctx, TranslationBlock *tb)
|
|
{
|
|
TCGv_i32 count;
|
|
|
|
tcg_ctx->exitreq_label = gen_new_label(tcg_ctx);
|
|
|
|
// first TB ever does not need to check exit request
|
|
if (tcg_ctx->uc->first_tb) {
|
|
// next TB is not the first anymore
|
|
tcg_ctx->uc->first_tb = false;
|
|
return;
|
|
}
|
|
|
|
count = tcg_temp_new_i32(tcg_ctx);
|
|
|
|
tcg_gen_ld_i32(tcg_ctx, count, tcg_ctx->cpu_env,
|
|
offsetof(ArchCPU, neg.icount_decr.u32) -
|
|
offsetof(ArchCPU, env));
|
|
|
|
tcg_gen_brcondi_i32(tcg_ctx, TCG_COND_LT, count, 0, tcg_ctx->exitreq_label);
|
|
|
|
tcg_temp_free_i32(tcg_ctx, count);
|
|
}
|
|
|
|
static inline void gen_tb_end(TCGContext *tcg_ctx, TranslationBlock *tb, int num_insns)
|
|
{
|
|
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);
|
|
}
|
|
|
|
gen_set_label(tcg_ctx, tcg_ctx->exitreq_label);
|
|
tcg_gen_exit_tb(tcg_ctx, tb, TB_EXIT_REQUESTED);
|
|
}
|
|
|
|
#endif
|