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linux-user: introduce target_sigsp() and target_save_altstack()

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Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180411192347.30228-1-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2018-04-11 21:23:47 +02:00
parent e8fa729574
commit 465e237bf7
19 changed files with 108 additions and 203 deletions
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32
linux-user/signal.c
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@ -249,6 +249,38 @@ void set_sigmask(const sigset_t *set)
}
#endif
/* sigaltstack management */
int on_sig_stack(unsigned long sp)
{
return (sp - target_sigaltstack_used.ss_sp
< target_sigaltstack_used.ss_size);
}
int sas_ss_flags(unsigned long sp)
{
return (target_sigaltstack_used.ss_size == 0 ? SS_DISABLE
: on_sig_stack(sp) ? SS_ONSTACK : 0);
}
abi_ulong target_sigsp(abi_ulong sp, struct target_sigaction *ka)
{
/*
* This is the X/Open sanctioned signal stack switching.
*/
if ((ka->sa_flags & TARGET_SA_ONSTACK) && !sas_ss_flags(sp)) {
return target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
}
return sp;
}
void target_save_altstack(target_stack_t *uss, CPUArchState *env)
{
__put_user(target_sigaltstack_used.ss_sp, &uss->ss_sp);
__put_user(sas_ss_flags(get_sp_from_cpustate(env)), &uss->ss_flags);
__put_user(target_sigaltstack_used.ss_size, &uss->ss_size);
}
/* siginfo conversion */
static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,