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hw/core: Add TCGCPUOps.record_sigbus

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Add a new user-only interface for updating cpu state before
raising a signal.  This will take the place of do_unaligned_access
for user-only and should result in less boilerplate for each guest.

Reviewed-by: Warner Losh <imp@bsdimp.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-10-04 10:05:20 -07:00
parent eeca7dc566
commit 644a9fece4
1 changed files with 23 additions and 0 deletions
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23
include/hw/core/tcg-cpu-ops.h
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@ -135,6 +135,29 @@ struct TCGCPUOps {
void (*record_sigsegv)(CPUState *cpu, vaddr addr,
MMUAccessType access_type,
bool maperr, uintptr_t ra);
/**
* record_sigbus:
* @cpu: cpu context
* @addr: misaligned guest address
* @access_type: access was read/write/execute
* @ra: host pc for unwinding
*
* We are about to raise SIGBUS with si_code BUS_ADRALN,
* and si_addr set for @addr. Record anything further needed
* for the signal ucontext_t.
*
* If the emulated kernel does not provide the signal handler with
* anything besides the user context registers, and the siginfo_t,
* then this hook need do nothing and may be omitted.
* Otherwise, record the data and return; the caller will raise
* the signal, unwind the cpu state, and return to the main loop.
*
* If it is simpler to re-use the sysemu do_unaligned_access code,
* @ra is provided so that a "normal" cpu exception can be raised.
* In this case, the signal must be raised by the architecture cpu_loop.
*/
void (*record_sigbus)(CPUState *cpu, vaddr addr,
MMUAccessType access_type, uintptr_t ra);
#endif /* CONFIG_SOFTMMU */
#endif /* NEED_CPU_H */