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tcg: Add EXCP_ATOMIC

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When we cannot emulate an atomic operation within a parallel
context, this exception allows us to stop the world and try
again in a serial context.

Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-06-29 22:12:55 -07:00
parent 1edaeee095
commit fdbc2b5722
9 changed files with 88 additions and 0 deletions
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1
include/exec/cpu-all.h
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@ -31,6 +31,7 @@
#define EXCP_DEBUG 0x10002 /* cpu stopped after a breakpoint or singlestep */
#define EXCP_HALTED 0x10003 /* cpu is halted (waiting for external event) */
#define EXCP_YIELD 0x10004 /* cpu wants to yield timeslice to another */
#define EXCP_ATOMIC 0x10005 /* stop-the-world and emulate atomic */
/* some important defines:
*

1
include/exec/exec-all.h
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@ -59,6 +59,7 @@ TranslationBlock *tb_gen_code(CPUState *cpu,
void QEMU_NORETURN cpu_loop_exit(CPUState *cpu);
void QEMU_NORETURN cpu_loop_exit_restore(CPUState *cpu, uintptr_t pc);
void QEMU_NORETURN cpu_loop_exit_atomic(CPUState *cpu, uintptr_t pc);
#if !defined(CONFIG_USER_ONLY)
void cpu_reloading_memory_map(void);

1
include/qemu-common.h
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@ -80,6 +80,7 @@ void tcg_exec_init(unsigned long tb_size);
bool tcg_enabled(void);
void cpu_exec_init_all(void);
void cpu_exec_step_atomic(CPUState *cpu);
/**
* set_preferred_target_page_bits: