X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fruntime%2Finterrupt.c;h=feb2cc979e8ef196abafaf893c7ea63d34b5afdc;hb=422b88abf96f4842a3d0999cd3b80d96f5a153d6;hp=159a9aeb81626dc2236399e0d692fb0f35c340ae;hpb=68fd2d2dd6f265669a8957accd8a33e62786a97e;p=sbcl.git diff --git a/src/runtime/interrupt.c b/src/runtime/interrupt.c index 159a9ae..feb2cc9 100644 --- a/src/runtime/interrupt.c +++ b/src/runtime/interrupt.c @@ -15,7 +15,7 @@ #include #include - +#include #include #include "runtime.h" @@ -40,6 +40,7 @@ void sigaddset_blockable(sigset_t *s) sigaddset(s, SIGPIPE); sigaddset(s, SIGALRM); sigaddset(s, SIGURG); + sigaddset(s, SIGFPE); sigaddset(s, SIGTSTP); sigaddset(s, SIGCHLD); sigaddset(s, SIGIO); @@ -104,31 +105,15 @@ static 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(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)) @@ -153,9 +138,10 @@ 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)); @@ -168,6 +154,29 @@ 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; + + /* 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(context); /* Do dynamic binding of the active interrupt context index * and save the context in the context array. */ @@ -178,8 +187,7 @@ fake_foreign_function_call(os_context_t *context) * which do bare >> and << for fixnum_value and make_fixnum. */ 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, @@ -290,7 +298,6 @@ interrupt_handle_pending(os_context_t *context) { undo_fake_foreign_function_call(context); } - fprintf(stderr,"interrupt-handle-pending: back from MAYBE_GC\n"); } /* FIXME: This isn't very clear. It would be good to reverse @@ -346,23 +353,12 @@ interrupt_handle_now(int signal, siginfo_t *info, void *void_context) #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 */ - +#ifdef LISP_FEATURE_LINUX + /* Under Linux, 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 = interrupt_handlers[signal]; if (ARE_SAME_HANDLER(handler.c, SIG_IGN)) { @@ -445,12 +441,12 @@ maybe_now_maybe_later(int signal, siginfo_t *info, void *void_context) * 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 */ - + */ + +#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 */ @@ -496,23 +492,60 @@ maybe_now_maybe_later(int signal, siginfo_t *info, void *void_context) * stuff to detect and handle hitting the GC trigger */ -#ifndef INTERNAL_GC_TRIGGER +#ifndef 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 +/* and similarly for the control stack guard page */ + +boolean handle_control_stack_guard_triggered(os_context_t *context,void *addr) +{ + /* note the os_context hackery here. When the signal handler returns, + * it won't go back to what it was doing ... */ + if(addr>=CONTROL_STACK_GUARD_PAGE && + addr<(CONTROL_STACK_GUARD_PAGE+os_vm_page_size)) { + void *function; + /* we hit the end of the control stack. disable protection + * temporarily so the error handler has some headroom */ + protect_control_stack_guard_page(0); + + function= + &(((struct simple_fun *) + native_pointer(SymbolFunction(CONTROL_STACK_EXHAUSTED_ERROR))) + ->code); + + /* Build a stack frame showing `interrupted' so that the + * user's backtrace makes (as much) sense (as usual) */ + build_fake_control_stack_frames(context); + /* signal handler will "return" to this error-causing function */ + *os_context_pc_addr(context)= function; +#ifndef LISP_FEATURE_X86 + /* 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)= function; + *os_context_register_addr(context,reg_CFP)= + current_control_frame_pointer; +#ifdef ARCH_HAS_NPC_REGISTER + *os_context_register_addr(context,reg_LIP)= + 4+*os_context_pc_addr(context); +#endif +#endif + return 1; + } + else return 0; +} + #ifndef __i386__ /* This function gets called from the SIGSEGV (for e.g. Linux or * OpenBSD) or SIGBUS (for e.g. FreeBSD) handler. Here we check @@ -524,11 +557,11 @@ 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 -#ifndef INTERNAL_GC_TRIGGER +#ifndef GENCGC /* since GENCGC has its own way to record trigger */ && gc_trigger_hit(signal, info, context) #endif ) { -#ifndef INTERNAL_GC_TRIGGER +#ifndef GENCGC /* since GENCGC has its own way to record trigger */ clear_auto_gc_trigger(); #endif @@ -550,11 +583,19 @@ 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)); 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; @@ -624,7 +665,20 @@ undoably_install_low_level_interrupt_handler (int signal, sigemptyset(&sa.sa_mask); sigaddset_blockable(&sa.sa_mask); sa.sa_flags = SA_SIGINFO | SA_RESTART; - +#ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK + /* Signal handlers are run on the control stack, so if it is exhausted + * we had better use an alternate stack for whatever signal tells us + * we've exhausted it */ + if(signal==SIG_MEMORY_FAULT) { + stack_t sigstack; + sigstack.ss_sp=(void *) ALTERNATE_SIGNAL_STACK_START; + sigstack.ss_flags=0; + sigstack.ss_size = SIGSTKSZ; + sigaltstack(&sigstack,0); + sa.sa_flags|=SA_ONSTACK; + } +#endif + /* 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) {