X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Finterrupt.c;h=f63dbf972387477bc156a4e00f8832c2d502d0a6;hb=e9c546b14771ebe96447c3920a75e9e580f9075f;hp=00c920e8ee1fa53b9d99836a34aa1fdc51ceed7f;hpb=0f234877047c56ca945fe54e9e77a9cc2c8141cb;p=sbcl.git diff --git a/src/runtime/interrupt.c b/src/runtime/interrupt.c index 00c920e..f63dbf9 100644 --- a/src/runtime/interrupt.c +++ b/src/runtime/interrupt.c @@ -63,25 +63,33 @@ #include "alloc.h" #include "dynbind.h" #include "interr.h" +#include "pseudo-atomic.h" #include "genesis/fdefn.h" #include "genesis/simple-fun.h" #include "genesis/cons.h" - - static void run_deferred_handler(struct interrupt_data *data, void *v_context); #ifndef LISP_FEATURE_WIN32 static void store_signal_data_for_later (struct interrupt_data *data, void *handler, int signal, siginfo_t *info, os_context_t *context); -boolean interrupt_maybe_gc_int(int signal, siginfo_t *info, void *v_context); + +static void +fill_current_sigmask(sigset_t *sigset) +{ + /* Get the current sigmask, by blocking the empty set. */ + sigset_t empty; + sigemptyset(&empty); + thread_sigmask(SIG_BLOCK, &empty, sigset); +} void sigaddset_deferrable(sigset_t *s) { sigaddset(s, SIGHUP); sigaddset(s, SIGINT); + sigaddset(s, SIGTERM); sigaddset(s, SIGQUIT); sigaddset(s, SIGPIPE); sigaddset(s, SIGALRM); @@ -89,41 +97,69 @@ sigaddset_deferrable(sigset_t *s) sigaddset(s, SIGTSTP); sigaddset(s, SIGCHLD); sigaddset(s, SIGIO); +#ifndef LISP_FEATURE_HPUX sigaddset(s, SIGXCPU); sigaddset(s, SIGXFSZ); +#endif sigaddset(s, SIGVTALRM); sigaddset(s, SIGPROF); sigaddset(s, SIGWINCH); -#if !((defined(LISP_FEATURE_DARWIN) || defined(LISP_FEATURE_FREEBSD)) && defined(LISP_FEATURE_SB_THREAD)) - sigaddset(s, SIGUSR1); - sigaddset(s, SIGUSR2); -#endif - #ifdef LISP_FEATURE_SB_THREAD sigaddset(s, SIG_INTERRUPT_THREAD); #endif } void -sigaddset_blockable(sigset_t *s) +sigaddset_blockable(sigset_t *sigset) { - sigaddset_deferrable(s); + sigaddset_deferrable(sigset); #ifdef LISP_FEATURE_SB_THREAD -#ifdef SIG_RESUME_FROM_GC - sigaddset(s, SIG_RESUME_FROM_GC); -#endif - sigaddset(s, SIG_STOP_FOR_GC); + sigaddset(sigset,SIG_STOP_FOR_GC); #endif } /* initialized in interrupt_init */ -static sigset_t deferrable_sigset; -static sigset_t blockable_sigset; +sigset_t deferrable_sigset; +sigset_t blockable_sigset; +#endif + +void +check_deferrables_unblocked_in_sigset_or_lose(sigset_t *sigset) +{ +#if !defined(LISP_FEATURE_WIN32) + int i; + for(i = 1; i < NSIG; i++) { + if (sigismember(&deferrable_sigset, i) && sigismember(sigset, i)) + lose("deferrable signal %d blocked\n",i); + } #endif +} void -check_blockables_blocked_or_lose() +check_deferrables_blocked_in_sigset_or_lose(sigset_t *sigset) +{ +#if !defined(LISP_FEATURE_WIN32) + int i; + for(i = 1; i < NSIG; i++) { + if (sigismember(&deferrable_sigset, i) && !sigismember(sigset, i)) + lose("deferrable signal %d not blocked\n",i); + } +#endif +} + +void +check_deferrables_blocked_or_lose(void) +{ +#if !defined(LISP_FEATURE_WIN32) + sigset_t current; + fill_current_sigmask(¤t); + check_deferrables_blocked_in_sigset_or_lose(¤t); +#endif +} + +void +check_blockables_blocked_or_lose(void) { #if !defined(LISP_FEATURE_WIN32) /* Get the current sigmask, by blocking the empty set. */ @@ -138,20 +174,100 @@ check_blockables_blocked_or_lose() #endif } +void +unblock_gc_signals(void) +{ +#ifdef LISP_FEATURE_SB_THREAD + sigset_t new; + sigemptyset(&new); +#if defined(SIG_RESUME_FROM_GC) + sigaddset(&new,SIG_RESUME_FROM_GC); +#endif + sigaddset(&new,SIG_STOP_FOR_GC); + thread_sigmask(SIG_UNBLOCK,&new,0); +#endif +} + inline static void check_interrupts_enabled_or_lose(os_context_t *context) { struct thread *thread=arch_os_get_current_thread(); if (SymbolValue(INTERRUPTS_ENABLED,thread) == NIL) lose("interrupts not enabled\n"); - if ( -#if !defined(LISP_FEATURE_X86) && !defined(LISP_FEATURE_X86_64) - (!foreign_function_call_active) && -#endif - arch_pseudo_atomic_atomic(context)) + if (arch_pseudo_atomic_atomic(context)) lose ("in pseudo atomic section\n"); } +/* Are we leaving WITH-GCING and already running with interrupts + * enabled, without the protection of *GC-INHIBIT* T and there is gc + * (or stop for gc) pending, but we haven't trapped yet? */ +int +in_leaving_without_gcing_race_p(struct thread *thread) +{ + return ((SymbolValue(IN_WITHOUT_GCING,thread) != NIL) && + (SymbolValue(INTERRUPTS_ENABLED,thread) != NIL) && + (SymbolValue(GC_INHIBIT,thread) == NIL) && + ((SymbolValue(GC_PENDING,thread) != NIL) +#if defined(LISP_FEATURE_SB_THREAD) + || (SymbolValue(STOP_FOR_GC_PENDING,thread) != NIL) +#endif + )); +} + +/* Check our baroque invariants. */ +void +check_interrupt_context_or_lose(os_context_t *context) +{ + struct thread *thread = arch_os_get_current_thread(); + struct interrupt_data *data = thread->interrupt_data; + int interrupt_deferred_p = (data->pending_handler != 0); + int interrupt_pending = (SymbolValue(INTERRUPT_PENDING,thread) != NIL); + /* On PPC pseudo_atomic_interrupted is cleared when coming out of + * handle_allocation_trap. */ +#if defined(LISP_FEATURE_GENCGC) && !defined(LISP_FEATURE_PPC) +#if 0 + int interrupts_enabled = (SymbolValue(INTERRUPTS_ENABLED,thread) != NIL); +#endif + int gc_inhibit = (SymbolValue(GC_INHIBIT,thread) != NIL); + int gc_pending = (SymbolValue(GC_PENDING,thread) == T); + int pseudo_atomic_interrupted = get_pseudo_atomic_interrupted(thread); + int in_race_p = in_leaving_without_gcing_race_p(thread); + /* In the time window between leaving the *INTERRUPTS-ENABLED* NIL + * section and trapping, a SIG_STOP_FOR_GC would see the next + * check fail, for this reason sig_stop_for_gc handler does not + * call this function. Plus, there may be interrupt lossage when a + * pseudo atomic is interrupted by a deferrable signal and gc is + * triggered, too. */ +#if 0 + if (interrupt_deferred_p) + if (!(!interrupts_enabled || pseudo_atomic_interrupted || in_race_p)) + lose("Stray deferred interrupt."); +#endif +#if 0 + if (gc_pending) + if (!(pseudo_atomic_interrupted || gc_inhibit || in_race_p)) + lose("GC_PENDING, but why?."); +#if defined(LISP_FEATURE_SB_THREAD) + { + int stop_for_gc_pending = + (SymbolValue(STOP_FOR_GC_PENDING,thread) != NIL); + if (stop_for_gc_pending) + if (!(pseudo_atomic_interrupted || gc_inhibit || in_race_p)) + lose("STOP_FOR_GC_PENDING, but why?."); + } +#endif +#endif +#endif + if (interrupt_pending && !interrupt_deferred_p) + lose("INTERRUPT_PENDING but not pending handler."); + if (interrupt_deferred_p) + check_deferrables_blocked_in_sigset_or_lose + (os_context_sigmask_addr(context)); + else + check_deferrables_unblocked_in_sigset_or_lose + (os_context_sigmask_addr(context)); +} + /* When we catch an internal error, should we pass it back to Lisp to * be handled in a high-level way? (Early in cold init, the answer is * 'no', because Lisp is still too brain-dead to handle anything. @@ -164,33 +280,27 @@ static void (*interrupt_low_level_handlers[NSIG]) (int, siginfo_t*, void*); #endif union interrupt_handler interrupt_handlers[NSIG]; -/* At the toplevel repl we routinely call this function. The signal - * mask ought to be clear anyway most of the time, but may be non-zero - * if we were interrupted e.g. while waiting for a queue. */ - void -reset_signal_mask(void) +block_blockable_signals(void) { #ifndef LISP_FEATURE_WIN32 - sigset_t new; - sigemptyset(&new); - thread_sigmask(SIG_SETMASK,&new,0); + thread_sigmask(SIG_BLOCK, &blockable_sigset, 0); #endif } void -block_blockable_signals(void) +block_deferrable_signals(void) { #ifndef LISP_FEATURE_WIN32 - thread_sigmask(SIG_BLOCK, &blockable_sigset, 0); + thread_sigmask(SIG_BLOCK, &deferrable_sigset, 0); #endif } void -block_deferrable_signals(void) +unblock_deferrable_signals(void) { #ifndef LISP_FEATURE_WIN32 - thread_sigmask(SIG_BLOCK, &deferrable_sigset, 0); + thread_sigmask(SIG_UNBLOCK, &deferrable_sigset, 0); #endif } @@ -268,12 +378,19 @@ fake_foreign_function_call(os_context_t *context) dynamic_space_free_pointer = (lispobj *)(unsigned long) (*os_context_register_addr(context, reg_ALLOC)); - /* fprintf(stderr,"dynamic_space_free_pointer: %p\n", dynamic_space_free_pointer); */ -#if defined(LISP_FEATURE_ALPHA) +/* fprintf(stderr,"dynamic_space_free_pointer: %p\n", */ +/* dynamic_space_free_pointer); */ +#if defined(LISP_FEATURE_ALPHA) || defined(LISP_FEATURE_MIPS) if ((long)dynamic_space_free_pointer & 1) { lose("dead in fake_foreign_function_call, context = %x\n", context); } #endif +/* why doesnt PPC and SPARC do something like this: */ +#if defined(LISP_FEATURE_HPPA) + if ((long)dynamic_space_free_pointer & 4) { + lose("dead in fake_foreign_function_call, context = %x, d_s_f_p = %x\n", context, dynamic_space_free_pointer); + } +#endif #endif #ifdef reg_BSP current_binding_stack_pointer = @@ -297,8 +414,9 @@ fake_foreign_function_call(os_context_t *context) thread->interrupt_contexts[context_index] = context; - /* no longer in Lisp now */ +#ifdef FOREIGN_FUNCTION_CALL_FLAG foreign_function_call_active = 1; +#endif } /* blocks all blockable signals. If you are calling from a signal handler, @@ -311,8 +429,9 @@ undo_fake_foreign_function_call(os_context_t *context) /* Block all blockable signals. */ block_blockable_signals(); - /* going back into Lisp */ +#ifdef FOREIGN_FUNCTION_CALL_FLAG foreign_function_call_active = 0; +#endif /* Undo dynamic binding of FREE_INTERRUPT_CONTEXT_INDEX */ unbind(thread); @@ -324,7 +443,8 @@ undo_fake_foreign_function_call(os_context_t *context) | (*os_context_register_addr(context, reg_ALLOC) & LOWTAG_MASK); /* - ((unsigned long)(*os_context_register_addr(context, reg_ALLOC)) & ~LOWTAG_MASK) + ((unsigned long)(*os_context_register_addr(context, reg_ALLOC)) + & ~LOWTAG_MASK) | ((unsigned long) dynamic_space_free_pointer & LOWTAG_MASK); */ #endif @@ -333,8 +453,7 @@ undo_fake_foreign_function_call(os_context_t *context) /* a handler for the signal caused by execution of a trap opcode * signalling an internal error */ void -interrupt_internal_error(int signal, siginfo_t *info, os_context_t *context, - boolean continuable) +interrupt_internal_error(os_context_t *context, boolean continuable) { lispobj context_sap; @@ -355,6 +474,16 @@ interrupt_internal_error(int signal, siginfo_t *info, os_context_t *context, thread_sigmask(SIG_SETMASK, os_context_sigmask_addr(context), 0); #endif +#if defined(LISP_FEATURE_LINUX) && defined(LISP_FEATURE_MIPS) + /* Workaround for blocked SIGTRAP. */ + { + sigset_t newset; + sigemptyset(&newset); + sigaddset(&newset, SIGTRAP); + thread_sigmask(SIG_UNBLOCK, &newset, 0); + } +#endif + SHOW("in interrupt_internal_error"); #ifdef QSHOW /* Display some rudimentary debugging information about the @@ -362,7 +491,7 @@ interrupt_internal_error(int signal, siginfo_t *info, os_context_t *context, * confused, we have a chance to determine what's going on. */ describe_internal_error(context); #endif - funcall2(SymbolFunction(INTERNAL_ERROR), context_sap, + funcall2(StaticSymbolFunction(INTERNAL_ERROR), context_sap, continuable ? T : NIL); undo_fake_foreign_function_call(context); /* blocks signals again */ @@ -373,14 +502,30 @@ interrupt_internal_error(int signal, siginfo_t *info, os_context_t *context, void interrupt_handle_pending(os_context_t *context) { + /* There are three ways we can get here. First, if an interrupt + * occurs within pseudo-atomic, it will be deferred, and we'll + * trap to here at the end of the pseudo-atomic block. Second, if + * the GC (in alloc()) decides that a GC is required, it will set + * *GC-PENDING* and pseudo-atomic-interrupted if not *GC-INHIBIT*, + * and alloc() is always called from within pseudo-atomic, and + * thus we end up here again. Third, when calling GC-ON or at the + * end of a WITHOUT-GCING, MAYBE-HANDLE-PENDING-GC will trap to + * here if there is a pending GC. Fourth, ahem, at the end of + * WITHOUT-INTERRUPTS (bar complications with nesting). */ + + /* Win32 only needs to handle the GC cases (for now?) */ + struct thread *thread; - struct interrupt_data *data; + + if (arch_pseudo_atomic_atomic(context)) { + lose("Handling pending interrupt in pseduo atomic."); + } + + thread = arch_os_get_current_thread(); FSHOW_SIGNAL((stderr, "/entering interrupt_handle_pending\n")); check_blockables_blocked_or_lose(); - thread=arch_os_get_current_thread(); - data=thread->interrupt_data; /* If pseudo_atomic_interrupted is set then the interrupt is going * to be handled now, ergo it's safe to clear it. */ @@ -389,36 +534,34 @@ interrupt_handle_pending(os_context_t *context) if (SymbolValue(GC_INHIBIT,thread)==NIL) { #ifdef LISP_FEATURE_SB_THREAD if (SymbolValue(STOP_FOR_GC_PENDING,thread) != NIL) { - /* another thread has already initiated a gc, this attempt - * might as well be cancelled */ - SetSymbolValue(GC_PENDING,NIL,thread); - SetSymbolValue(STOP_FOR_GC_PENDING,NIL,thread); + /* STOP_FOR_GC_PENDING and GC_PENDING are cleared by + * the signal handler if it actually stops us. */ sig_stop_for_gc_handler(SIG_STOP_FOR_GC,NULL,context); } else #endif - if (SymbolValue(GC_PENDING,thread) != NIL) { + /* Test for T and not for != NIL since the value :IN-PROGRESS + * is used in SUB-GC as part of the mechanism to supress + * recursive gcs.*/ + if (SymbolValue(GC_PENDING,thread) == T) { /* GC_PENDING is cleared in SUB-GC, or if another thread * is doing a gc already we will get a SIG_STOP_FOR_GC and * that will clear it. */ - interrupt_maybe_gc_int(0,NULL,context); + maybe_gc(context); } check_blockables_blocked_or_lose(); } +#ifndef LISP_FEATURE_WIN32 /* we may be here only to do the gc stuff, if interrupts are * enabled run the pending handler */ - if (!((SymbolValue(INTERRUPTS_ENABLED,thread) == NIL) || - ( -#if !defined(LISP_FEATURE_X86) && !defined(LISP_FEATURE_X86_64) - (!foreign_function_call_active) && -#endif - arch_pseudo_atomic_atomic(context)))) { + if (SymbolValue(INTERRUPTS_ENABLED,thread) != NIL) { + struct interrupt_data *data = thread->interrupt_data; /* There may be no pending handler, because it was only a gc * that had to be executed or because pseudo atomic triggered * twice for a single interrupt. For the interested reader, * that may happen if an interrupt hits after the interrupted - * flag is cleared but before pseduo-atomic is set and a + * flag is cleared but before pseudo-atomic is set and a * pseudo atomic is interrupted in that interrupt. */ if (data->pending_handler) { @@ -426,9 +569,8 @@ interrupt_handle_pending(os_context_t *context) * to WITHOUT-INTERRUPTS, then INTERRUPT_PENDING is already * NIL, because maybe_defer_handler sets * PSEUDO_ATOMIC_INTERRUPTED only if interrupts are enabled.*/ - SetSymbolValue(INTERRUPT_PENDING, NIL,thread); + SetSymbolValue(INTERRUPT_PENDING, NIL, thread); -#ifndef LISP_FEATURE_WIN32 /* restore the saved signal mask from the original signal (the * one that interrupted us during the critical section) into the * os_context for the signal we're currently in the handler for. @@ -436,13 +578,12 @@ interrupt_handle_pending(os_context_t *context) * blocked signals are unblocked */ sigcopyset(os_context_sigmask_addr(context), &data->pending_mask); - sigemptyset(&data->pending_mask); -#endif /* This will break on sparc linux: the deferred handler really wants * to be called with a void_context */ run_deferred_handler(data,(void *)context); } } +#endif } /* @@ -461,17 +602,15 @@ interrupt_handle_pending(os_context_t *context) */ void -interrupt_handle_now(int signal, siginfo_t *info, void *void_context) +interrupt_handle_now(int signal, siginfo_t *info, os_context_t *context) { - os_context_t *context = (os_context_t*)void_context; -#if !defined(LISP_FEATURE_X86) && !defined(LISP_FEATURE_X86_64) +#ifdef FOREIGN_FUNCTION_CALL_FLAG boolean were_in_lisp; #endif union interrupt_handler handler; check_blockables_blocked_or_lose(); - #ifndef LISP_FEATURE_WIN32 if (sigismember(&deferrable_sigset,signal)) check_interrupts_enabled_or_lose(context); @@ -484,14 +623,13 @@ interrupt_handle_now(int signal, siginfo_t *info, void *void_context) os_restore_fp_control(context); #endif - handler = interrupt_handlers[signal]; if (ARE_SAME_HANDLER(handler.c, SIG_IGN)) { return; } -#if !defined(LISP_FEATURE_X86) && !defined(LISP_FEATURE_X86_64) +#ifdef FOREIGN_FUNCTION_CALL_FLAG were_in_lisp = !foreign_function_call_active; if (were_in_lisp) #endif @@ -556,11 +694,10 @@ interrupt_handle_now(int signal, siginfo_t *info, void *void_context) /* Allow signals again. */ thread_sigmask(SIG_SETMASK, os_context_sigmask_addr(context), 0); #endif - - (*handler.c)(signal, info, void_context); + (*handler.c)(signal, info, context); } -#if !defined(LISP_FEATURE_X86) && !defined(LISP_FEATURE_X86_64) +#ifdef FOREIGN_FUNCTION_CALL_FLAG if (were_in_lisp) #endif { @@ -578,7 +715,8 @@ interrupt_handle_now(int signal, siginfo_t *info, void *void_context) * already; we're just doing the Lisp-level processing now that we * put off then */ static void -run_deferred_handler(struct interrupt_data *data, void *v_context) { +run_deferred_handler(struct interrupt_data *data, void *v_context) +{ /* The pending_handler may enable interrupts and then another * interrupt may hit, overwrite interrupt_data, so reset the * pending handler before calling it. Trust the handler to finish @@ -600,45 +738,40 @@ maybe_defer_handler(void *handler, struct interrupt_data *data, if (SymbolValue(INTERRUPT_PENDING,thread) != NIL) lose("interrupt already pending\n"); + check_interrupt_context_or_lose(context); /* If interrupts are disabled then INTERRUPT_PENDING is set and * not PSEDUO_ATOMIC_INTERRUPTED. This is important for a pseudo * atomic section inside a WITHOUT-INTERRUPTS. + * + * Also, if in_leaving_without_gcing_race_p then + * interrupt_handle_pending is going to be called soon, so + * stashing the signal away is safe. */ - if (SymbolValue(INTERRUPTS_ENABLED,thread) == NIL) { + if ((SymbolValue(INTERRUPTS_ENABLED,thread) == NIL) || + in_leaving_without_gcing_race_p(thread)) { store_signal_data_for_later(data,handler,signal,info,context); SetSymbolValue(INTERRUPT_PENDING, T,thread); FSHOW_SIGNAL((stderr, - "/maybe_defer_handler(%x,%d),thread=%lu: deferred\n", - (unsigned int)handler,signal, - (unsigned long)thread->os_thread)); + "/maybe_defer_handler(%x,%d): deferred\n", + (unsigned int)handler,signal)); + check_interrupt_context_or_lose(context); return 1; } - /* a slightly confusing test. arch_pseudo_atomic_atomic() doesn't + /* a slightly confusing test. arch_pseudo_atomic_atomic() doesn't * actually use its argument for anything on x86, so this branch * may succeed even when context is null (gencgc alloc()) */ - if ( -#if !defined(LISP_FEATURE_X86) && !defined(LISP_FEATURE_X86_64) - /* FIXME: this foreign_function_call_active test is dubious at - * best. If a foreign call is made in a pseudo atomic section - * (?) or more likely a pseudo atomic section is in a foreign - * call then an interrupt is executed immediately. Maybe it - * has to do with C code not maintaining pseudo atomic - * properly. MG - 2005-08-10 */ - (!foreign_function_call_active) && -#endif - arch_pseudo_atomic_atomic(context)) { + if (arch_pseudo_atomic_atomic(context)) { store_signal_data_for_later(data,handler,signal,info,context); arch_set_pseudo_atomic_interrupted(context); FSHOW_SIGNAL((stderr, - "/maybe_defer_handler(%x,%d),thread=%lu: deferred(PA)\n", - (unsigned int)handler,signal, - (unsigned long)thread->os_thread)); + "/maybe_defer_handler(%x,%d): deferred(PA)\n", + (unsigned int)handler,signal)); + check_interrupt_context_or_lose(context); return 1; } FSHOW_SIGNAL((stderr, - "/maybe_defer_handler(%x,%d),thread=%lu: not deferred\n", - (unsigned int)handler,signal, - (unsigned long)thread->os_thread)); + "/maybe_defer_handler(%x,%d): not deferred\n", + (unsigned int)handler,signal)); return 0; } @@ -657,7 +790,8 @@ store_signal_data_for_later (struct interrupt_data *data, void *handler, if(info) memcpy(&(data->pending_info), info, sizeof(siginfo_t)); - FSHOW_SIGNAL((stderr, "/store_signal_data_for_later: signal: %d\n", signal)); + FSHOW_SIGNAL((stderr, "/store_signal_data_for_later: signal: %d\n", + signal)); if(context) { /* the signal mask in the context (from before we were @@ -674,66 +808,42 @@ static void maybe_now_maybe_later(int signal, siginfo_t *info, void *void_context) { os_context_t *context = arch_os_get_context(&void_context); - - struct thread *thread; - struct interrupt_data *data; - - thread=arch_os_get_current_thread(); - data=thread->interrupt_data; + struct thread *thread = arch_os_get_current_thread(); + struct interrupt_data *data = thread->interrupt_data; #if defined(LISP_FEATURE_LINUX) || defined(RESTORE_FP_CONTROL_FROM_CONTEXT) os_restore_fp_control(context); #endif - if(maybe_defer_handler(interrupt_handle_now,data,signal,info,context)) - return; - interrupt_handle_now(signal, info, context); -#ifdef LISP_FEATURE_DARWIN - /* Work around G5 bug */ - DARWIN_FIX_CONTEXT(context); -#endif + if(!maybe_defer_handler(interrupt_handle_now,data,signal,info,context)) + interrupt_handle_now(signal, info, context); } static void -low_level_interrupt_handle_now(int signal, siginfo_t *info, void *void_context) +low_level_interrupt_handle_now(int signal, siginfo_t *info, + os_context_t *context) { - os_context_t *context = (os_context_t*)void_context; - -#if defined(LISP_FEATURE_LINUX) || defined(RESTORE_FP_CONTROL_FROM_CONTEXT) - os_restore_fp_control(context); -#endif - + /* No FP control fixage needed, caller has done that. */ check_blockables_blocked_or_lose(); check_interrupts_enabled_or_lose(context); - interrupt_low_level_handlers[signal](signal, info, void_context); -#ifdef LISP_FEATURE_DARWIN - /* Work around G5 bug */ - DARWIN_FIX_CONTEXT(context); -#endif + (*interrupt_low_level_handlers[signal])(signal, info, context); + /* No Darwin context fixage needed, caller does that. */ } static void low_level_maybe_now_maybe_later(int signal, siginfo_t *info, void *void_context) { os_context_t *context = arch_os_get_context(&void_context); - struct thread *thread; - struct interrupt_data *data; - - thread=arch_os_get_current_thread(); - data=thread->interrupt_data; + struct thread *thread = arch_os_get_current_thread(); + struct interrupt_data *data = thread->interrupt_data; #if defined(LISP_FEATURE_LINUX) || defined(RESTORE_FP_CONTROL_FROM_CONTEXT) os_restore_fp_control(context); #endif - if(maybe_defer_handler(low_level_interrupt_handle_now,data, - signal,info,context)) - return; - low_level_interrupt_handle_now(signal, info, context); -#ifdef LISP_FEATURE_DARWIN - /* Work around G5 bug */ - DARWIN_FIX_CONTEXT(context); -#endif + if(!maybe_defer_handler(low_level_interrupt_handle_now,data, + signal,info,context)) + low_level_interrupt_handle_now(signal, info, context); } #endif @@ -747,84 +857,70 @@ sig_stop_for_gc_handler(int signal, siginfo_t *info, void *void_context) struct thread *thread=arch_os_get_current_thread(); sigset_t ss; - if ((arch_pseudo_atomic_atomic(context) || - SymbolValue(GC_INHIBIT,thread) != NIL)) { + /* Test for GC_INHIBIT _first_, else we'd trap on every single + * pseudo atomic until gc is finally allowed. */ + if (SymbolValue(GC_INHIBIT,thread) != NIL) { SetSymbolValue(STOP_FOR_GC_PENDING,T,thread); - if (SymbolValue(GC_INHIBIT,thread) == NIL) - arch_set_pseudo_atomic_interrupted(context); - FSHOW_SIGNAL((stderr,"thread=%lu sig_stop_for_gc deferred\n", - thread->os_thread)); - } else { - /* need the context stored so it can have registers scavenged */ - fake_foreign_function_call(context); + FSHOW_SIGNAL((stderr, "sig_stop_for_gc deferred (*GC-INHIBIT*)\n")); + return; + } else if (arch_pseudo_atomic_atomic(context)) { + SetSymbolValue(STOP_FOR_GC_PENDING,T,thread); + arch_set_pseudo_atomic_interrupted(context); + FSHOW_SIGNAL((stderr,"sig_stop_for_gc deferred (PA)\n")); + return; + } - sigfillset(&ss); /* Block everything. */ - thread_sigmask(SIG_BLOCK,&ss,0); + /* Not PA and GC not inhibited -- we can stop now. */ - if(thread->state!=STATE_RUNNING) { - lose("sig_stop_for_gc_handler: wrong thread state: %ld\n", - fixnum_value(thread->state)); - } - thread->state=STATE_SUSPENDED; - FSHOW_SIGNAL((stderr,"thread=%lu suspended\n",thread->os_thread)); + /* need the context stored so it can have registers scavenged */ + fake_foreign_function_call(context); -#if defined(SIG_RESUME_FROM_GC) - sigemptyset(&ss); sigaddset(&ss,SIG_RESUME_FROM_GC); -#else - sigemptyset(&ss); sigaddset(&ss,SIG_STOP_FOR_GC); -#endif + /* Block everything. */ + sigfillset(&ss); + thread_sigmask(SIG_BLOCK,&ss,0); - /* It is possible to get SIGCONT (and probably other - * non-blockable signals) here. */ -#ifdef SIG_RESUME_FROM_GC - { - int sigret; - do { sigwait(&ss, &sigret); } - while (sigret != SIG_RESUME_FROM_GC); - } -#else - while (sigwaitinfo(&ss,0) != SIG_STOP_FOR_GC); -#endif + /* Not pending anymore. */ + SetSymbolValue(GC_PENDING,NIL,thread); + SetSymbolValue(STOP_FOR_GC_PENDING,NIL,thread); - FSHOW_SIGNAL((stderr,"thread=%lu resumed\n",thread->os_thread)); - if(thread->state!=STATE_RUNNING) { - lose("sig_stop_for_gc_handler: wrong thread state on wakeup: %ld\n", - fixnum_value(thread->state)); - } + if(thread_state(thread)!=STATE_RUNNING) { + lose("sig_stop_for_gc_handler: wrong thread state: %ld\n", + fixnum_value(thread->state)); + } + + set_thread_state(thread,STATE_SUSPENDED); + FSHOW_SIGNAL((stderr,"suspended\n")); + + wait_for_thread_state_change(thread, STATE_SUSPENDED); + FSHOW_SIGNAL((stderr,"resumed\n")); - undo_fake_foreign_function_call(context); + if(thread_state(thread)!=STATE_RUNNING) { + lose("sig_stop_for_gc_handler: wrong thread state on wakeup: %ld\n", + fixnum_value(thread_state(thread))); } + + undo_fake_foreign_function_call(context); } + #endif void interrupt_handle_now_handler(int signal, siginfo_t *info, void *void_context) { os_context_t *context = arch_os_get_context(&void_context); - interrupt_handle_now(signal, info, context); -#ifdef LISP_FEATURE_DARWIN - DARWIN_FIX_CONTEXT(context); +#if defined(LISP_FEATURE_LINUX) || defined(RESTORE_FP_CONTROL_FROM_CONTEXT) + os_restore_fp_control(context); +#ifndef LISP_FEATURE_WIN32 + if ((signal == SIGILL) || (signal == SIGBUS) +#ifndef LISP_FEATURE_LINUX + || (signal == SIGEMT) +#endif + ) + corruption_warning_and_maybe_lose("Signal %d recieved", signal); #endif -} - -/* - * stuff to detect and handle hitting the GC trigger - */ - -#ifndef LISP_FEATURE_GENCGC -/* since GENCGC has its own way to record trigger */ -static boolean -gc_trigger_hit(int signal, siginfo_t *info, os_context_t *context) -{ - if (current_auto_gc_trigger == NULL) - return 0; - else{ - void *badaddr=arch_get_bad_addr(signal,info,context); - return (badaddr >= (void *)current_auto_gc_trigger && - badaddr <((void *)current_dynamic_space + dynamic_space_size)); - } -} #endif + interrupt_handle_now(signal, info, context); +} /* manipulate the signal context and stack such that when the handler * returns, it will call function instead of whatever it was doing @@ -908,8 +1004,10 @@ arrange_return_to_lisp_function(os_context_t *context, lispobj function) *(register_save_area + 7) = *os_context_register_addr(context,reg_EAX); *(register_save_area + 8) = *context_eflags_addr(context); - *os_context_pc_addr(context) = call_into_lisp_tramp; - *os_context_register_addr(context,reg_ECX) = register_save_area; + *os_context_pc_addr(context) = + (os_context_register_t) call_into_lisp_tramp; + *os_context_register_addr(context,reg_ECX) = + (os_context_register_t) register_save_area; #else /* return address for call_into_lisp: */ @@ -1006,6 +1104,8 @@ arrange_return_to_lisp_function(os_context_t *context, lispobj function) *os_context_register_addr(context,reg_CODE) = (os_context_register_t)(fun + FUN_POINTER_LOWTAG); #endif + FSHOW((stderr, "/arranged return to Lisp function (0x%lx)\n", + (long)function)); } #ifdef LISP_FEATURE_SB_THREAD @@ -1017,9 +1117,13 @@ interrupt_thread_handler(int num, siginfo_t *info, void *v_context) { os_context_t *context = (os_context_t*)arch_os_get_context(&v_context); + FSHOW_SIGNAL((stderr,"/interrupt_thread_handler\n")); + check_blockables_blocked_or_lose(); + /* let the handler enable interrupts again when it sees fit */ sigaddset_deferrable(os_context_sigmask_addr(context)); - arrange_return_to_lisp_function(context, SymbolFunction(RUN_INTERRUPTION)); + arrange_return_to_lisp_function(context, + StaticSymbolFunction(RUN_INTERRUPTION)); } #endif @@ -1031,8 +1135,9 @@ interrupt_thread_handler(int num, siginfo_t *info, void *v_context) * functions and variables. */ void -undefined_alien_function() { - funcall0(SymbolFunction(UNDEFINED_ALIEN_FUNCTION_ERROR)); +undefined_alien_function(void) +{ + funcall0(StaticSymbolFunction(UNDEFINED_ALIEN_FUNCTION_ERROR)); } boolean @@ -1048,11 +1153,12 @@ handle_guard_page_triggered(os_context_t *context,os_vm_address_t addr) * protection so the error handler has some headroom, protect the * previous page so that we can catch returns from the guard page * and restore it. */ + corruption_warning_and_maybe_lose("Control stack exhausted"); protect_control_stack_guard_page(0); protect_control_stack_return_guard_page(1); arrange_return_to_lisp_function - (context, SymbolFunction(CONTROL_STACK_EXHAUSTED_ERROR)); + (context, StaticSymbolFunction(CONTROL_STACK_EXHAUSTED_ERROR)); return 1; } else if(addr >= CONTROL_STACK_RETURN_GUARD_PAGE(th) && @@ -1068,105 +1174,11 @@ handle_guard_page_triggered(os_context_t *context,os_vm_address_t addr) else if (addr >= undefined_alien_address && addr < undefined_alien_address + os_vm_page_size) { arrange_return_to_lisp_function - (context, SymbolFunction(UNDEFINED_ALIEN_VARIABLE_ERROR)); + (context, StaticSymbolFunction(UNDEFINED_ALIEN_VARIABLE_ERROR)); return 1; } else return 0; } - -#ifndef LISP_FEATURE_GENCGC -/* This function gets called from the SIGSEGV (for e.g. Linux, NetBSD, & - * OpenBSD) or SIGBUS (for e.g. FreeBSD) handler. Here we check - * whether the signal was due to treading on the mprotect()ed zone - - * and if so, arrange for a GC to happen. */ -extern unsigned long bytes_consed_between_gcs; /* gc-common.c */ - -boolean -interrupt_maybe_gc(int signal, siginfo_t *info, void *void_context) -{ - os_context_t *context=(os_context_t *) void_context; - - if(!foreign_function_call_active && gc_trigger_hit(signal, info, context)){ - struct thread *thread=arch_os_get_current_thread(); - clear_auto_gc_trigger(); - /* Don't flood the system with interrupts if the need to gc is - * already noted. This can happen for example when SUB-GC - * allocates or after a gc triggered in a WITHOUT-GCING. */ - if (SymbolValue(GC_PENDING,thread) == NIL) { - if (SymbolValue(GC_INHIBIT,thread) == NIL) { - if (arch_pseudo_atomic_atomic(context)) { - /* set things up so that GC happens when we finish - * the PA section */ - SetSymbolValue(GC_PENDING,T,thread); - arch_set_pseudo_atomic_interrupted(context); - } else { - interrupt_maybe_gc_int(signal,info,void_context); - } - } else { - SetSymbolValue(GC_PENDING,T,thread); - } - } - return 1; - } - return 0; -} - -#endif - -/* this is also used by gencgc, in alloc() */ -boolean -interrupt_maybe_gc_int(int signal, siginfo_t *info, void *void_context) -{ - os_context_t *context=(os_context_t *) void_context; -#ifndef LISP_FEATURE_WIN32 - struct thread *thread=arch_os_get_current_thread(); -#endif - - fake_foreign_function_call(context); - - /* SUB-GC may return without GCing if *GC-INHIBIT* is set, in - * which case we will be running with no gc trigger barrier - * thing for a while. But it shouldn't be long until the end - * of WITHOUT-GCING. - * - * FIXME: It would be good to protect the end of dynamic space - * and signal a storage condition from there. - */ - - /* Restore the signal mask from the interrupted context before - * calling into Lisp if interrupts are enabled. Why not always? - * - * Suppose there is a WITHOUT-INTERRUPTS block far, far out. If an - * interrupt hits while in SUB-GC, it is deferred and the - * os_context_sigmask of that interrupt is set to block further - * deferrable interrupts (until the first one is - * handled). Unfortunately, that context refers to this place and - * when we return from here the signals will not be blocked. - * - * A kludgy alternative is to propagate the sigmask change to the - * outer context. - */ -#ifndef LISP_FEATURE_WIN32 - if(SymbolValue(INTERRUPTS_ENABLED,thread)!=NIL) - thread_sigmask(SIG_SETMASK, os_context_sigmask_addr(context), 0); -#ifdef LISP_FEATURE_SB_THREAD - else { - sigset_t new; - sigemptyset(&new); -#if defined(SIG_RESUME_FROM_GC) - sigaddset(&new,SIG_RESUME_FROM_GC); -#endif - sigaddset(&new,SIG_STOP_FOR_GC); - thread_sigmask(SIG_UNBLOCK,&new,0); - } -#endif -#endif - funcall0(SymbolFunction(SUB_GC)); - - undo_fake_foreign_function_call(context); - return 1; -} - /* * noise to install handlers @@ -1214,7 +1226,7 @@ sigaction_nodefer_test_handler(int signal, siginfo_t *info, void *void_context) } static void -see_if_sigaction_nodefer_works() +see_if_sigaction_nodefer_works(void) { struct sigaction sa, old_sa; @@ -1262,9 +1274,7 @@ low_level_unblock_me_trampoline(int signal, siginfo_t *info, void *void_context) void undoably_install_low_level_interrupt_handler (int signal, - void handler(int, - siginfo_t*, - void*)) + interrupt_handler_t handler) { struct sigaction sa; @@ -1293,9 +1303,6 @@ undoably_install_low_level_interrupt_handler (int signal, | (sigaction_nodefer_works ? SA_NODEFER : 0); #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK if((signal==SIG_MEMORY_FAULT) -#ifdef SIG_MEMORY_FAULT2 - || (signal==SIG_MEMORY_FAULT2) -#endif #ifdef SIG_INTERRUPT_THREAD || (signal==SIG_INTERRUPT_THREAD) #endif @@ -1358,8 +1365,16 @@ install_handler(int signal, void handler(int, siginfo_t*, void*)) #endif } +/* This must not go through lisp as it's allowed anytime, even when on + * the altstack. */ +void +sigabrt_handler(int signal, siginfo_t *info, void *void_context) +{ + lose("SIGABRT received.\n"); +} + void -interrupt_init() +interrupt_init(void) { #ifndef LISP_FEATURE_WIN32 int i; @@ -1380,7 +1395,7 @@ interrupt_init() * 3-argument form is expected.) */ (void (*)(int, siginfo_t*, void*))SIG_DFL; } - + undoably_install_low_level_interrupt_handler(SIGABRT, sigabrt_handler); SHOW("returning from interrupt_init()"); #endif } @@ -1397,11 +1412,70 @@ void lisp_memory_fault_error(os_context_t *context, os_vm_address_t addr) { /* FIXME: This is lossy: if we get another memory fault (eg. from - * another thread) before lisp has read this, we the information. + * another thread) before lisp has read this, we lose the information. * However, since this is mostly informative, we'll live with that for * now -- some address is better then no address in this case. */ current_memory_fault_address = addr; - arrange_return_to_lisp_function(context, SymbolFunction(MEMORY_FAULT_ERROR)); + /* To allow debugging memory faults in signal handlers and such. */ + corruption_warning_and_maybe_lose("Memory fault"); + arrange_return_to_lisp_function(context, + StaticSymbolFunction(MEMORY_FAULT_ERROR)); } #endif + +static void +unhandled_trap_error(os_context_t *context) +{ + lispobj context_sap; + fake_foreign_function_call(context); + context_sap = alloc_sap(context); +#ifndef LISP_FEATURE_WIN32 + thread_sigmask(SIG_SETMASK, os_context_sigmask_addr(context), 0); +#endif + funcall1(StaticSymbolFunction(UNHANDLED_TRAP_ERROR), context_sap); + lose("UNHANDLED-TRAP-ERROR fell through"); +} + +/* Common logic for trapping instructions. How we actually handle each + * case is highly architecture dependent, but the overall shape is + * this. */ +void +handle_trap(os_context_t *context, int trap) +{ + switch(trap) { + case trap_PendingInterrupt: + FSHOW((stderr, "/\n")); + arch_skip_instruction(context); + interrupt_handle_pending(context); + break; + case trap_Error: + case trap_Cerror: + FSHOW((stderr, "/\n", trap)); + interrupt_internal_error(context, trap==trap_Cerror); + break; + case trap_Breakpoint: + arch_handle_breakpoint(context); + break; + case trap_FunEndBreakpoint: + arch_handle_fun_end_breakpoint(context); + break; +#ifdef trap_AfterBreakpoint + case trap_AfterBreakpoint: + arch_handle_after_breakpoint(context); + break; +#endif +#ifdef trap_SingleStepAround + case trap_SingleStepAround: + case trap_SingleStepBefore: + arch_handle_single_step_trap(context, trap); + break; +#endif + case trap_Halt: + fake_foreign_function_call(context); + lose("%%PRIMITIVE HALT called; the party is over.\n"); + default: + unhandled_trap_error(context); + } +} +