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linux-user: Split out helpers for sigsuspend

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Two new functions: process_sigsuspend_mask and finish_sigsuspend_mask.
Move the size check and copy-from-user code.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20220315084308.433109-3-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Richard Henderson 2022-03-15 01:43:05 -07:00 • committed by Laurent Vivier
parent 7fb5ef350b
commit 0a99f09383
3 changed files with 66 additions and 23 deletions
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26
linux-user/signal-common.h
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@ -92,4 +92,30 @@ abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx,
*/
int block_signals(void); /* Returns non zero if signal pending */
/**
* process_sigsuspend_mask: read and apply syscall-local signal mask
*
* Read the guest signal mask from @sigset, length @sigsize.
* Convert that to a host signal mask and save it to sigpending_mask.
*
* Return value: negative target errno, or zero;
* store &sigpending_mask into *pset on success.
*/
int process_sigsuspend_mask(sigset_t **pset, target_ulong sigset,
target_ulong sigsize);
/**
* finish_sigsuspend_mask: finish a sigsuspend-like syscall
*
* Set in_sigsuspend if we need to use the modified sigset
* during process_pending_signals.
*/
static inline void finish_sigsuspend_mask(int ret)
{
if (ret != -QEMU_ERESTARTSYS) {
TaskState *ts = (TaskState *)thread_cpu->opaque;
ts->in_sigsuspend = 1;
}
}
#endif