diff options
Diffstat (limited to 'linux-user/signal.c')
| -rw-r--r-- | linux-user/signal.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c index a3022c2f04..01de433e3a 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -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, |