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author | Timothy Pearson <tpearson@raptorengineering.com> | 2019-05-11 15:12:49 -0500 |
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committer | Timothy Pearson <tpearson@raptorengineering.com> | 2019-05-11 15:12:49 -0500 |
commit | 9e80202352dd49bdd9e67b8b906d86f058431505 (patch) | |
tree | 5673c17aad6e3833da8c4ff21b5a11f666ec9fbe /src/include/exec/gen-icount.h | |
download | hqemu-master.zip hqemu-master.tar.gz |
Diffstat (limited to 'src/include/exec/gen-icount.h')
-rw-r--r-- | src/include/exec/gen-icount.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/include/exec/gen-icount.h b/src/include/exec/gen-icount.h new file mode 100644 index 0000000..05d89d3 --- /dev/null +++ b/src/include/exec/gen-icount.h @@ -0,0 +1,79 @@ +#ifndef GEN_ICOUNT_H +#define GEN_ICOUNT_H 1 + +#include "qemu/timer.h" + +/* Helpers for instruction counting code generation. */ + +static TCGArg *icount_arg; +static TCGLabel *icount_label; +static TCGLabel *exitreq_label; + +static inline void gen_tb_start(TranslationBlock *tb) +{ + TCGv_i32 count, flag, imm; + int i; + + exitreq_label = gen_new_label(); + flag = tcg_temp_new_i32(); + tcg_gen_ld_i32(flag, cpu_env, + offsetof(CPUState, tcg_exit_req) - ENV_OFFSET); + tcg_gen_brcondi_i32(TCG_COND_NE, flag, 0, exitreq_label); + tcg_temp_free_i32(flag); + + if (!(tb->cflags & CF_USE_ICOUNT)) { + return; + } + + icount_label = gen_new_label(); + count = tcg_temp_local_new_i32(); + tcg_gen_ld_i32(count, cpu_env, + -ENV_OFFSET + offsetof(CPUState, icount_decr.u32)); + + imm = tcg_temp_new_i32(); + tcg_gen_movi_i32(imm, 0xdeadbeef); + + /* This is a horrid hack to allow fixing up the value later. */ + i = tcg_ctx.gen_last_op_idx; + i = tcg_ctx.gen_op_buf[i].args; + icount_arg = &tcg_ctx.gen_opparam_buf[i + 1]; + + tcg_gen_sub_i32(count, count, imm); + tcg_temp_free_i32(imm); + + tcg_gen_brcondi_i32(TCG_COND_LT, count, 0, icount_label); + tcg_gen_st16_i32(count, cpu_env, + -ENV_OFFSET + offsetof(CPUState, icount_decr.u16.low)); + tcg_temp_free_i32(count); +} + +static void gen_tb_end(TranslationBlock *tb, int num_insns) +{ + gen_set_label(exitreq_label); + tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_REQUESTED); + + if (tb->cflags & CF_USE_ICOUNT) { + *icount_arg = num_insns; + gen_set_label(icount_label); + tcg_gen_exit_tb((uintptr_t)tb + TB_EXIT_ICOUNT_EXPIRED); + } + + /* Terminate the linked list. */ + tcg_ctx.gen_op_buf[tcg_ctx.gen_last_op_idx].next = -1; +} + +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 |