X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Finterrupt.c;h=5155c6a4fde116feab6efa5dbc489b6c82f48fbc;hb=e795ac27a9780a35a7d561bfe34d7df224958fbd;hp=467a2e4431cefab9fc412c8d5e12845f15fbdf6a;hpb=686043635c45a16b418d2cc96a7f704fdab182c2;p=sbcl.git diff --git a/src/runtime/interrupt.c b/src/runtime/interrupt.c index 467a2e4..5155c6a 100644 --- a/src/runtime/interrupt.c +++ b/src/runtime/interrupt.c @@ -31,6 +31,8 @@ #include "alloc.h" #include "dynbind.h" #include "interr.h" +#include "genesis/fdefn.h" +#include "genesis/simple-fun.h" void sigaddset_blockable(sigset_t *s) { @@ -60,7 +62,7 @@ void sigaddset_blockable(sigset_t *s) * becomes 'yes'.) */ boolean internal_errors_enabled = 0; -os_context_t *lisp_interrupt_contexts[MAX_INTERRUPTS]; +struct interrupt_data * global_interrupt_data; /* As far as I can tell, what's going on here is: * @@ -89,47 +91,21 @@ os_context_t *lisp_interrupt_contexts[MAX_INTERRUPTS]; * - WHN 20000728, dan 20010128 */ -void (*interrupt_low_level_handlers[NSIG]) (int, siginfo_t*, void*) = {0}; -union interrupt_handler interrupt_handlers[NSIG]; - -/* signal number, siginfo_t, and old mask information for pending signal - * - * pending_signal=0 when there is no pending signal. */ -static int pending_signal = 0; -static siginfo_t pending_info; -static sigset_t pending_mask; - -static boolean maybe_gc_pending = 0; +boolean maybe_gc_pending = 0; /* * utility routines used by various signal handlers */ -void -fake_foreign_function_call(os_context_t *context) +void +build_fake_control_stack_frames(struct thread *th,os_context_t *context) { - int context_index; -#ifndef __i386__ +#ifndef LISP_FEATURE_X86 + lispobj oldcont; -#endif - /* Get current Lisp state from context. */ -#ifdef reg_ALLOC - dynamic_space_free_pointer = - (lispobj *)(*os_context_register_addr(context, reg_ALLOC)); -#ifdef alpha - if ((long)dynamic_space_free_pointer & 1) { - lose("dead in fake_foreign_function_call, context = %x", context); - } -#endif -#endif -#ifdef reg_BSP - current_binding_stack_pointer = - (lispobj *)(*os_context_register_addr(context, reg_BSP)); -#endif + /* Build a fake stack frame or frames */ -#ifndef __i386__ - /* Build a fake stack frame. */ current_control_frame_pointer = (lispobj *)(*os_context_register_addr(context, reg_CSP)); if ((lispobj *)(*os_context_register_addr(context, reg_CFP)) @@ -154,9 +130,10 @@ fake_foreign_function_call(os_context_t *context) oldcont = (lispobj)(*os_context_register_addr(context, reg_OCFP)); } } - /* ### We can't tell whether we are still in the caller if it had - * to reg_ALLOCate the stack frame due to stack arguments. */ - /* ### Can anything strange happen during return? */ + /* We can't tell whether we are still in the caller if it had to + * allocate a stack frame due to stack arguments. */ + /* This observation provoked some past CMUCL maintainer to ask + * "Can anything strange happen during return?" */ else { /* normal case */ oldcont = (lispobj)(*os_context_register_addr(context, reg_CFP)); @@ -169,24 +146,44 @@ fake_foreign_function_call(os_context_t *context) current_control_frame_pointer[2] = (lispobj)(*os_context_register_addr(context, reg_CODE)); #endif +} + +void +fake_foreign_function_call(os_context_t *context) +{ + int context_index; + struct thread *thread=arch_os_get_current_thread(); + + /* Get current Lisp state from context. */ +#ifdef reg_ALLOC + dynamic_space_free_pointer = + (lispobj *)(*os_context_register_addr(context, reg_ALLOC)); +#ifdef alpha + if ((long)dynamic_space_free_pointer & 1) { + lose("dead in fake_foreign_function_call, context = %x", context); + } +#endif +#endif +#ifdef reg_BSP + current_binding_stack_pointer = + (lispobj *)(*os_context_register_addr(context, reg_BSP)); +#endif + + build_fake_control_stack_frames(thread,context); /* Do dynamic binding of the active interrupt context index * and save the context in the context array. */ - context_index = SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX)>>2; - /* FIXME: Ick! Why use abstract "make_fixnum" in some places if - * you're going to convert from fixnum by bare >>2 in other - * places? Use fixnum_value(..) here, and look for other places - * which do bare >> and << for fixnum_value and make_fixnum. */ - + context_index = + fixnum_value(SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,thread)); + if (context_index >= MAX_INTERRUPTS) { - lose("maximum interrupt nesting depth (%d) exceeded", - MAX_INTERRUPTS); + lose("maximum interrupt nesting depth (%d) exceeded", MAX_INTERRUPTS); } bind_variable(FREE_INTERRUPT_CONTEXT_INDEX, - make_fixnum(context_index + 1)); + make_fixnum(context_index + 1),thread); - lisp_interrupt_contexts[context_index] = context; + thread->interrupt_contexts[context_index] = context; /* no longer in Lisp now */ foreign_function_call_active = 1; @@ -195,6 +192,7 @@ fake_foreign_function_call(os_context_t *context) void undo_fake_foreign_function_call(os_context_t *context) { + struct thread *thread=arch_os_get_current_thread(); /* Block all blockable signals. */ sigset_t block; sigemptyset(&block); @@ -211,7 +209,7 @@ undo_fake_foreign_function_call(os_context_t *context) * perhaps yes, unbind_to_here() really would be clearer and less * fragile.. */ /* dan (2001.08.10) thinks the above supposition is probably correct */ - unbind(); + unbind(thread); #ifdef reg_ALLOC /* Put the dynamic space free pointer back into the context. */ @@ -270,21 +268,27 @@ interrupt_internal_error(int signal, siginfo_t *info, os_context_t *context, void interrupt_handle_pending(os_context_t *context) { + struct thread *thread; + struct interrupt_data *data; + #ifndef __i386__ boolean were_in_lisp = !foreign_function_call_active; #endif - - SetSymbolValue(INTERRUPT_PENDING, NIL); +#ifdef LISP_FEATURE_SB_THREAD + while(stop_the_world) kill(getpid(),SIGSTOP); +#endif + thread=arch_os_get_current_thread(); + data=thread->interrupt_data; + SetSymbolValue(INTERRUPT_PENDING, NIL,thread); if (maybe_gc_pending) { - maybe_gc_pending = 0; #ifndef __i386__ if (were_in_lisp) #endif { fake_foreign_function_call(context); } - funcall0(SymbolFunction(MAYBE_GC)); + funcall0(SymbolFunction(SUB_GC)); #ifndef __i386__ if (were_in_lisp) #endif @@ -321,12 +325,12 @@ interrupt_handle_pending(os_context_t *context) memcpy(os_context_sigmask_addr(context), &pending_mask, 4 /* sizeof(sigset_t) */ ); #endif - sigemptyset(&pending_mask); - if (pending_signal) { - int signal = pending_signal; + sigemptyset(&data->pending_mask); + if (data->pending_signal) { + int signal = data->pending_signal; siginfo_t info; - memcpy(&info, &pending_info, sizeof(siginfo_t)); - pending_signal = 0; + memcpy(&info, &data->pending_info, sizeof(siginfo_t)); + data->pending_signal = 0; interrupt_handle_now(signal, &info, context); } } @@ -335,35 +339,34 @@ interrupt_handle_pending(os_context_t *context) * the two main signal handlers: * interrupt_handle_now(..) * maybe_now_maybe_later(..) + * + * to which we have added interrupt_handle_now_handler(..). Why? + * Well, mostly because the SPARC/Linux platform doesn't quite do + * signals the way we want them done. The third argument in the + * handler isn't filled in by the kernel properly, so we fix it up + * ourselves in the arch_os_get_context(..) function; however, we only + * want to do this when we first hit the handler, and not when + * interrupt_handle_now(..) is being called from some other handler + * (when the fixup will already have been done). -- CSR, 2002-07-23 */ void interrupt_handle_now(int signal, siginfo_t *info, void *void_context) { os_context_t *context = (os_context_t*)void_context; + struct thread *thread=arch_os_get_current_thread(); #ifndef __i386__ boolean were_in_lisp; #endif union interrupt_handler handler; - /* FIXME: The CMU CL we forked off of had this Linux-only - * operation here. Newer CMU CLs (e.g. 18c) have hairier - * Linux/i386-only logic here. SBCL seems to be more reliable - * without anything here. However, if we start supporting code - * which sets the rounding mode, then we may want to do something - * special to force the rounding mode back to some standard value - * here, so that ISRs can have a standard environment. (OTOH, if - * rounding modes are under user control, then perhaps we should - * leave this up to the user.) - * - * In the absence of a test case to show that this is really a - * problem, we just suppress this code completely (just like the - * parallel code in maybe_now_maybe_later). - * #ifdef __linux__ - * SET_FPU_CONTROL_WORD(context->__fpregs_mem.cw); - * #endif */ - - handler = interrupt_handlers[signal]; +#ifdef LISP_FEATURE_LINUX + /* Under Linux on some architectures, we appear to have to restore + the FPU control word from the context, as after the signal is + delivered we appear to have a null FPU control word. */ + os_restore_fp_control(context); +#endif + handler = thread->interrupt_data->interrupt_handlers[signal]; if (ARE_SAME_HANDLER(handler.c, SIG_IGN)) { return; @@ -436,84 +439,130 @@ interrupt_handle_now(int signal, siginfo_t *info, void *void_context) } static void -maybe_now_maybe_later(int signal, siginfo_t *info, void *void_context) +store_signal_data_for_later (struct interrupt_data *data, int signal, + siginfo_t *info, os_context_t *context) { - os_context_t *context = (os_context_t*)void_context; + data->pending_signal = signal; + memcpy(&(data->pending_info), info, sizeof(siginfo_t)); + memcpy(&(data->pending_mask), + os_context_sigmask_addr(context), + sizeof(sigset_t)); + sigaddset_blockable(os_context_sigmask_addr(context)); +} - /* FIXME: See Debian cmucl 2.4.17, and mail from DTC on the CMU CL - * mailing list 23 Oct 1999, for changes in FPU handling at - * interrupt time which should be ported into SBCL. Also see the - * analogous logic at the head of interrupt_handle_now for - * more related FIXME stuff. - * - * For now, we just suppress this code completely. - * #ifdef __linux__ - * SET_FPU_CONTROL_WORD(context->__fpregs_mem.cw); - * #endif */ +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=arch_os_get_current_thread(); + struct interrupt_data *data=thread->interrupt_data; +#ifdef LISP_FEATURE_LINUX + os_restore_fp_control(context); +#endif /* see comments at top of code/signal.lisp for what's going on here * with INTERRUPTS_ENABLED/INTERRUPT_HANDLE_NOW */ - if (SymbolValue(INTERRUPTS_ENABLED) == NIL) { - - /* FIXME: This code is exactly the same as the code in the - * other leg of the if(..), and should be factored out into - * a shared function. */ - pending_signal = signal; - memcpy(&pending_info, info, sizeof(siginfo_t)); - memcpy(&pending_mask, - os_context_sigmask_addr(context), - sizeof(sigset_t)); - sigaddset_blockable(os_context_sigmask_addr(context)); - SetSymbolValue(INTERRUPT_PENDING, T); - + if (SymbolValue(INTERRUPTS_ENABLED,thread) == NIL) { + store_signal_data_for_later(data,signal,info,context); + SetSymbolValue(INTERRUPT_PENDING, T,thread); } else if ( #ifndef __i386__ (!foreign_function_call_active) && #endif arch_pseudo_atomic_atomic(context)) { - - /* FIXME: It would probably be good to replace these bare - * memcpy(..) calls with calls to cpy_siginfo_t and - * cpy_sigset_t, so that we only have to get the sizeof - * expressions right in one place, and after that static type - * checking takes over. */ - pending_signal = signal; - memcpy(&pending_info, info, sizeof(siginfo_t)); - memcpy(&pending_mask, - os_context_sigmask_addr(context), - sizeof(sigset_t)); - sigaddset_blockable(os_context_sigmask_addr(context)); - + store_signal_data_for_later(data,signal,info,context); arch_set_pseudo_atomic_interrupted(context); - } else { interrupt_handle_now(signal, info, context); } } + +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); +} + /* * stuff to detect and handle hitting the GC trigger */ -#ifndef INTERNAL_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{ - lispobj *badaddr=(lispobj *)arch_get_bad_addr(signal, - info, - context); - - return (badaddr >= current_auto_gc_trigger && - badaddr < current_dynamic_space + DYNAMIC_SPACE_SIZE); + 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 -#ifndef __i386__ +/* and similarly for the control stack guard page */ + +boolean handle_control_stack_guard_triggered(os_context_t *context,void *addr) +{ + struct thread *th=arch_os_get_current_thread(); + /* note the os_context hackery here. When the signal handler returns, + * it won't go back to what it was doing ... */ + if(addr>=(void *)CONTROL_STACK_GUARD_PAGE(th) && + addr<(void *)(CONTROL_STACK_GUARD_PAGE(th)+os_vm_page_size)) { + void *fun; + void *code; + /* fprintf(stderr, "hit end of control stack\n"); */ + /* we hit the end of the control stack. disable protection + * temporarily so the error handler has some headroom */ + protect_control_stack_guard_page(th->pid,0L); + + fun = (void *) + native_pointer((lispobj) SymbolFunction(CONTROL_STACK_EXHAUSTED_ERROR)); + code = &(((struct simple_fun *) fun)->code); + + /* Build a stack frame showing `interrupted' so that the + * user's backtrace makes (as much) sense (as usual) */ + build_fake_control_stack_frames(th,context); + /* signal handler will "return" to this error-causing function */ + *os_context_pc_addr(context) = code; +#ifdef LISP_FEATURE_X86 + *os_context_register_addr(context,reg_ECX) = 0; +#else + /* this much of the calling convention is common to all + non-x86 ports */ + *os_context_register_addr(context,reg_NARGS) = 0; + *os_context_register_addr(context,reg_LIP) = code; + *os_context_register_addr(context,reg_CFP) = + current_control_frame_pointer; +#endif +#ifdef ARCH_HAS_NPC_REGISTER + *os_context_npc_addr(context) = + 4 + *os_context_pc_addr(context); +#endif +#ifdef LISP_FEATURE_SPARC + /* Bletch. This is a feature of the SPARC calling convention, + which sadly I'm not going to go into in large detail here, + as I don't know it well enough. Suffice to say that if the + line + + (INST MOVE CODE-TN FUNCTION) + + in compiler/sparc/call.lisp is changed, then this bit can + probably go away. -- CSR, 2002-07-24 */ + *os_context_register_addr(context,reg_CODE) = + fun + FUN_POINTER_LOWTAG; +#endif + return 1; + } + else return 0; +} + +#ifndef LISP_FEATURE_X86 /* This function gets called from the SIGSEGV (for e.g. Linux or * OpenBSD) or SIGBUS (for e.g. FreeBSD) handler. Here we check * whether the signal was due to treading on the mprotect()ed zone - @@ -522,13 +571,18 @@ boolean interrupt_maybe_gc(int signal, siginfo_t *info, void *void_context) { os_context_t *context=(os_context_t *) void_context; + struct thread *th=arch_os_get_current_thread(); + struct interrupt_data *data= + th ? th->interrupt_data : global_interrupt_data; if (!foreign_function_call_active -#ifndef INTERNAL_GC_TRIGGER +#ifndef LISP_FEATURE_GENCGC + /* nb: GENCGC on non-x86? I really don't think so. This + * happens every time */ && gc_trigger_hit(signal, info, context) #endif ) { -#ifndef INTERNAL_GC_TRIGGER +#ifndef LISP_FEATURE_GENCGC clear_auto_gc_trigger(); #endif @@ -538,11 +592,11 @@ interrupt_maybe_gc(int signal, siginfo_t *info, void *void_context) * will detect pending_signal==0 and know to do a GC with the * signal context instead of calling a Lisp-level handler */ maybe_gc_pending = 1; - if (pending_signal == 0) { + if (data->pending_signal == 0) { /* FIXME: This copy-pending_mask-then-sigaddset_blockable * idiom occurs over and over. It should be factored out * into a function with a descriptive name. */ - memcpy(&pending_mask, + memcpy(&(data->pending_mask), os_context_sigmask_addr(context), sizeof(sigset_t)); sigaddset_blockable(os_context_sigmask_addr(context)); @@ -550,11 +604,19 @@ interrupt_maybe_gc(int signal, siginfo_t *info, void *void_context) arch_set_pseudo_atomic_interrupted(context); } else { + lispobj *old_free_space=current_dynamic_space; fake_foreign_function_call(context); - funcall0(SymbolFunction(MAYBE_GC)); + funcall0(SymbolFunction(SUB_GC)); undo_fake_foreign_function_call(context); - } - + if(current_dynamic_space==old_free_space) + /* MAYBE-GC (as the name suggest) might not. If it + * doesn't, it won't reset the GC trigger either, so we + * have to do it ourselves. Put it near the end of + * dynamic space so we're not running into it continually + */ + set_auto_gc_trigger(DYNAMIC_SPACE_SIZE + -(u32)os_vm_page_size); + } return 1; } else { return 0; @@ -566,46 +628,29 @@ interrupt_maybe_gc(int signal, siginfo_t *info, void *void_context) * noise to install handlers */ -/* - * what low-level signal handlers looked like before - * undoably_install_low_level_interrupt_handler() got involved - */ -struct low_level_signal_handler_state { - int was_modified; - void (*handler)(int, siginfo_t*, void*); -} old_low_level_signal_handler_states[NSIG]; +/* SBCL used to have code to restore signal handlers on exit, which + * has been removed from the threaded version until we decide: exit of + * _what_ ? */ + +/* SBCL comment: The "undoably" aspect is because we also arrange with + * atexit() for the handler to be restored to its old value. This is + * for tidiness: it shouldn't matter much ordinarily, but it does + * remove a window where e.g. memory fault signals (SIGSEGV or SIGBUS, + * which in ordinary operation of SBCL are sent to the generational + * garbage collector, then possibly onward to Lisp code) or SIGINT + * (which is ordinarily passed to Lisp code) could otherwise be + * handled bizarrely/brokenly because the Lisp code would try to deal + * with them using machinery (like stream output buffers) which has + * already been dismantled. */ + +/* I'm not sure (a) whether this is a real concern, (b) how it helps + anyway */ void uninstall_low_level_interrupt_handlers_atexit(void) { - int signal; - for (signal = 0; signal < NSIG; ++signal) { - struct low_level_signal_handler_state - *old_low_level_signal_handler_state = - old_low_level_signal_handler_states + signal; - if (old_low_level_signal_handler_state->was_modified) { - struct sigaction sa; - sa.sa_sigaction = old_low_level_signal_handler_state->handler; - sigemptyset(&sa.sa_mask); - sa.sa_flags = SA_SIGINFO | SA_RESTART; - sigaction(signal, &sa, NULL); - } - } } -/* Undoably install a special low-level handler for signal; or if - * handler is SIG_DFL, remove any special handling for signal. - * - * The "undoably" aspect is because we also arrange with atexit() for - * the handler to be restored to its old value. This is for tidiness: - * it shouldn't matter much ordinarily, but it does remove a window - * where e.g. memory fault signals (SIGSEGV or SIGBUS, which in - * ordinary operation of SBCL are sent to the generational garbage - * collector, then possibly onward to Lisp code) or SIGINT (which is - * ordinarily passed to Lisp code) could otherwise be handled - * bizarrely/brokenly because the Lisp code would try to deal with - * them using machinery (like stream output buffers) which has already - * been dismantled. */ void undoably_install_low_level_interrupt_handler (int signal, void handler(int, @@ -613,8 +658,9 @@ undoably_install_low_level_interrupt_handler (int signal, void*)) { struct sigaction sa; - struct low_level_signal_handler_state *old_low_level_signal_handler_state = - old_low_level_signal_handler_states + signal; + struct thread *th=arch_os_get_current_thread(); + struct interrupt_data *data= + th ? th->interrupt_data : global_interrupt_data; if (0 > signal || signal >= NSIG) { lose("bad signal number %d", signal); @@ -624,19 +670,12 @@ undoably_install_low_level_interrupt_handler (int signal, sigemptyset(&sa.sa_mask); sigaddset_blockable(&sa.sa_mask); sa.sa_flags = SA_SIGINFO | SA_RESTART; - - /* In the case of interrupt handlers which are modified more than - * once, we only save the original unmodified copy. */ - if (!old_low_level_signal_handler_state->was_modified) { - struct sigaction *old_handler = - (struct sigaction*) &old_low_level_signal_handler_state->handler; - old_low_level_signal_handler_state->was_modified = 1; - sigaction(signal, &sa, old_handler); - } else { +#ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK + if(signal==SIG_MEMORY_FAULT) sa.sa_flags|= SA_ONSTACK; +#endif + sigaction(signal, &sa, NULL); - } - - interrupt_low_level_handlers[signal] = + data->interrupt_low_level_handlers[signal] = (ARE_SAME_HANDLER(handler, SIG_DFL) ? 0 : handler); } @@ -647,6 +686,9 @@ install_handler(int signal, void handler(int, siginfo_t*, void*)) struct sigaction sa; sigset_t old, new; union interrupt_handler oldhandler; + struct thread *th=arch_os_get_current_thread(); + struct interrupt_data *data= + th ? th->interrupt_data : global_interrupt_data; FSHOW((stderr, "/entering POSIX install_handler(%d, ..)\n", signal)); @@ -659,25 +701,24 @@ install_handler(int signal, void handler(int, siginfo_t*, void*)) FSHOW((stderr, "/interrupt_low_level_handlers[signal]=%d\n", interrupt_low_level_handlers[signal])); - if (interrupt_low_level_handlers[signal]==0) { + if (data->interrupt_low_level_handlers[signal]==0) { if (ARE_SAME_HANDLER(handler, SIG_DFL) || ARE_SAME_HANDLER(handler, SIG_IGN)) { sa.sa_sigaction = handler; } else if (sigismember(&new, signal)) { sa.sa_sigaction = maybe_now_maybe_later; } else { - sa.sa_sigaction = interrupt_handle_now; + sa.sa_sigaction = interrupt_handle_now_handler; } sigemptyset(&sa.sa_mask); sigaddset_blockable(&sa.sa_mask); sa.sa_flags = SA_SIGINFO | SA_RESTART; - sigaction(signal, &sa, NULL); } - oldhandler = interrupt_handlers[signal]; - interrupt_handlers[signal].c = handler; + oldhandler = data->interrupt_handlers[signal]; + data->interrupt_handlers[signal].c = handler; sigprocmask(SIG_SETMASK, &old, 0); @@ -687,18 +728,15 @@ install_handler(int signal, void handler(int, siginfo_t*, void*)) } void -interrupt_init(void) +interrupt_init() { int i; - SHOW("entering interrupt_init()"); - - /* Set up for recovery from any installed low-level handlers. */ - atexit(&uninstall_low_level_interrupt_handlers_atexit); + global_interrupt_data=calloc(sizeof(struct interrupt_data), 1); /* Set up high level handler information. */ for (i = 0; i < NSIG; i++) { - interrupt_handlers[i].c = + global_interrupt_data->interrupt_handlers[i].c = /* (The cast here blasts away the distinction between * SA_SIGACTION-style three-argument handlers and * signal(..)-style one-argument handlers, which is OK