diff options
Diffstat (limited to 'arch/um/os-Linux/signal.c')
| -rw-r--r-- | arch/um/os-Linux/signal.c | 55 |
1 files changed, 51 insertions, 4 deletions
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c index 8c9d162e6c51..1d501acb22ee 100644 --- a/arch/um/os-Linux/signal.c +++ b/arch/um/os-Linux/signal.c @@ -18,6 +18,7 @@ #include <sysdep/mcontext.h> #include <um_malloc.h> #include <sys/ucontext.h> +#include <timetravel.h> void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = { [SIGTRAP] = relay_signal, @@ -63,16 +64,29 @@ static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc) #define SIGALRM_MASK (1 << SIGALRM_BIT) int signals_enabled; +#ifdef UML_CONFIG_UML_TIME_TRAVEL_SUPPORT +static int signals_blocked; +#else +#define signals_blocked false +#endif static unsigned int signals_pending; static unsigned int signals_active = 0; void sig_handler(int sig, struct siginfo *si, mcontext_t *mc) { - int enabled; + int enabled = signals_enabled; - enabled = signals_enabled; - if (!enabled && (sig == SIGIO)) { - signals_pending |= SIGIO_MASK; + if ((signals_blocked || !enabled) && (sig == SIGIO)) { + /* + * In TT_MODE_EXTERNAL, need to still call time-travel + * handlers unless signals are also blocked for the + * external time message processing. This will mark + * signals_pending by itself (only if necessary.) + */ + if (!signals_blocked && time_travel_mode == TT_MODE_EXTERNAL) + sigio_run_timetravel_handlers(); + else + signals_pending |= SIGIO_MASK; return; } @@ -363,6 +377,39 @@ int set_signals_trace(int enable) return ret; } +#ifdef UML_CONFIG_UML_TIME_TRAVEL_SUPPORT +void mark_sigio_pending(void) +{ + signals_pending |= SIGIO_MASK; +} + +void block_signals_hard(void) +{ + if (signals_blocked) + return; + signals_blocked = 1; + barrier(); +} + +void unblock_signals_hard(void) +{ + if (!signals_blocked) + return; + /* Must be set to 0 before we check the pending bits etc. */ + signals_blocked = 0; + barrier(); + + if (signals_pending && signals_enabled) { + /* this is a bit inefficient, but that's not really important */ + block_signals(); + unblock_signals(); + } else if (signals_pending & SIGIO_MASK) { + /* we need to run time-travel handlers even if not enabled */ + sigio_run_timetravel_handlers(); + } +} +#endif + int os_is_signal_stack(void) { stack_t ss; |