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/* $Header: /Volumes/share2/src/cmucl/cvs2git/cvsroot/src/lisp/interrupt.c,v 1.5 1994/10/24 20:05:30 ram Exp $ */
/* Interrupt handing magic. */
#include <stdio.h>
#include <signal.h>
#include "globals.h"
#include "lispregs.h"
#include "validate.h"
#include "monitor.h"
#include "gc.h"
#include "alloc.h"
#include "dynbind.h"
#include "interr.h"
boolean internal_errors_enabled = 0;
struct sigcontext *lisp_interrupt_contexts[MAX_INTERRUPTS];
union interrupt_handler interrupt_handlers[NSIG];
void (*interrupt_low_level_handlers[NSIG]) (HANDLER_ARGS) = {0};
static int pending_signal = 0;
#ifdef SOLARIS
static siginfo_t *pending_code;
#define PASSCODE(code) ((code))
#define DEREFCODE(code) ((code))
#else
static int pending_code = 0;
#define PASSCODE(code) (code)
#define DEREFCODE(code) (code)
#endif
#ifdef POSIX_SIGS
static sigset_t pending_mask;
#else
static int pending_mask = 0;
#endif
static boolean maybe_gc_pending = FALSE;
/****************************************************************\
* Utility routines used by various signal handlers. *
\****************************************************************/
void fake_foreign_function_call(struct sigcontext *context)
{
int context_index;
lispobj oldcont;
/* Get current LISP state from context */
#ifdef reg_ALLOC
current_dynamic_space_free_pointer = (lispobj *)SC_REG(context, reg_ALLOC);
#ifdef alpha
if((long) current_dynamic_space_free_pointer & 1) {
printf("Dead in fake_foriegn_function-call, context = %x\n",context);
lose("");
}
#endif
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#endif
#ifdef reg_BSP
current_binding_stack_pointer = (lispobj *)SC_REG(context, reg_BSP);
#endif
#ifndef i386
/* Build a fake stack frame */
current_control_frame_pointer = (lispobj *)SC_REG(context, reg_CSP);
if ((lispobj *)SC_REG(context, reg_CFP)==current_control_frame_pointer) {
/* There is a small window during call where the callee's frame */
/* isn't built yet. */
if (LowtagOf(SC_REG(context, reg_CODE)) == type_FunctionPointer) {
/* We have called, but not built the new frame, so
build it for them. */
current_control_frame_pointer[0] = SC_REG(context, reg_OCFP);
current_control_frame_pointer[1] = SC_REG(context, reg_LRA);
current_control_frame_pointer += 8;
/* Build our frame on top of it. */
oldcont = (lispobj)SC_REG(context, reg_CFP);
}
else {
/* We haven't yet called, build our frame as if the
partial frame wasn't there. */
oldcont = (lispobj)SC_REG(context, reg_OCFP);
}
}
/* ### We can't tell if 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? */
else
/* Normal case. */
oldcont = (lispobj)SC_REG(context, reg_CFP);
current_control_stack_pointer = current_control_frame_pointer + 8;
current_control_frame_pointer[0] = oldcont;
current_control_frame_pointer[1] = NIL;
current_control_frame_pointer[2] = (lispobj)SC_REG(context, reg_CODE);
#endif
/* 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;
if (context_index >= MAX_INTERRUPTS) {
fprintf(stderr,
"Maximum number (%d) of interrupts exceeded. Exiting.\n",
MAX_INTERRUPTS);
exit(1);
}
bind_variable(FREE_INTERRUPT_CONTEXT_INDEX,
make_fixnum(context_index + 1));
lisp_interrupt_contexts[context_index] = context;
/* No longer in Lisp now. */
foreign_function_call_active = 1;
}
void undo_fake_foreign_function_call(struct sigcontext *context)
{
/* Block all blockable signals */
#ifdef POSIX_SIGS
sigset_t block;
sigemptyset(&block);
FILLBLOCKSET(&block);
sigprocmask(SIG_BLOCK, &block, 0);
#else
/* Going back into lisp. */
foreign_function_call_active = 0;
/* Undo dynamic binding. */
/* ### Do I really need to unbind_to_here()? */
unbind();
#ifdef reg_ALLOC
/* Put the dynamic space free pointer back into the context. */
SC_REG(context, reg_ALLOC) =
(unsigned long) current_dynamic_space_free_pointer;
#endif
}
#ifdef POSIX_SIGS
sigprocmask(SIG_SETMASK,&context->uc_sigmask, 0);
#else
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fake_foreign_function_call(context);
if (internal_errors_enabled)
funcall2(SymbolFunction(INTERNAL_ERROR), alloc_sap(context),
continuable ? T : NIL);
else
internal_error(context);
undo_fake_foreign_function_call(context);
if (continuable)
arch_skip_instruction(context);
}
void interrupt_handle_pending(struct sigcontext *context)
{
boolean were_in_lisp = !foreign_function_call_active;
SetSymbolValue(INTERRUPT_PENDING, NIL);
if (maybe_gc_pending) {
maybe_gc_pending = FALSE;
if (were_in_lisp)
fake_foreign_function_call(context);
funcall0(SymbolFunction(MAYBE_GC));
if (were_in_lisp)
undo_fake_foreign_function_call(context);
}
if (pending_signal) {
int signal;
#ifdef SOLARIS
siginfo_t *code;
#else
int code;
#endif
signal = pending_signal;
code = pending_code;
pending_signal = 0;
/* pending_code = 0; /**/
interrupt_handle_now(signal, PASSCODE(code), context);
#ifdef POSIX_SIGS
context->uc_sigmask = pending_mask;
sigemptyset(&pending_mask);
#else
}
/****************************************************************\
* interrupt_handle_now, maybe_now_maybe_later *
* the two main signal handlers. *
\****************************************************************/
{
int were_in_lisp;
union interrupt_handler handler;
handler = interrupt_handlers[signal];
if(handler.c==SIG_IGN)
return;
were_in_lisp = !foreign_function_call_active;
if (were_in_lisp)
fake_foreign_function_call(context);
/* Allow signals again. */
#ifdef POSIX_SIGS
sigprocmask(SIG_SETMASK, &context->uc_sigmask, 0);
#else
if (handler.c==SIG_DFL)
/* This can happen if someone tries to ignore or default on of the */
/* signals we need for runtime support, and the runtime support */
/* decides to pass on it. */
lose("interrupt_handle_now: No handler for signal %d?\n", signal);
else if (LowtagOf(handler.lisp) == type_FunctionPointer)
#if 1
funcall3(handler.lisp, make_fixnum(signal), make_fixnum(CODE(code)),
alloc_sap(context));
#else
funcall3(handler.lisp, make_fixnum(signal), alloc_sap(code),
else
(*handler.c)(signal, code, context);
if (were_in_lisp)
undo_fake_foreign_function_call(context);
}
if (SymbolValue(INTERRUPTS_ENABLED) == NIL) {
pending_signal = signal;
pending_code = DEREFCODE(code);
#ifdef POSIX_SIGS
pending_mask = context->uc_sigmask;
FILLBLOCKSET(&context->uc_sigmask);
#else
pending_mask = context->sc_mask;
context->sc_mask |= BLOCKABLE;
SetSymbolValue(INTERRUPT_PENDING, T);
} else if ((!foreign_function_call_active)
&& arch_pseudo_atomic_atomic(context)) {
pending_signal = signal;
pending_code = DEREFCODE(code);
#ifdef POSIX_SIGS
pending_mask = context->uc_sigmask;
FILLBLOCKSET(&context->uc_sigmask);
#else
pending_mask = context->sc_mask;
context->sc_mask |= BLOCKABLE;
arch_set_pseudo_atomic_interrupted(context);
} else
interrupt_handle_now(signal, code, context);
}
/****************************************************************\
* Stuff to detect and handle hitting the gc trigger. *
\****************************************************************/
#ifndef INTERNAL_GC_TRIGGER
{
if (current_auto_gc_trigger == NULL)
return FALSE;
else{
lispobj *badaddr=(lispobj *)arch_get_bad_addr(signal, code, context);
return (badaddr >= current_auto_gc_trigger &&
badaddr < current_dynamic_space + DYNAMIC_SPACE_SIZE);
}
}
#endif
{
if (!foreign_function_call_active
#ifndef INTERNAL_GC_TRIGGER
&& gc_trigger_hit(signal, code, context)
#endif
) {
#ifndef INTERNAL_GC_TRIGGER
clear_auto_gc_trigger();
#endif
if (arch_pseudo_atomic_atomic(context)) {
maybe_gc_pending = TRUE;
if (pending_signal == 0) {
#ifdef POSIX_SIGS
pending_mask = context->uc_sigmask;
FILLBLOCKSET(&context->uc_sigmask);
#else
pending_mask = context->sc_mask;
context->sc_mask |= BLOCKABLE;
}
arch_set_pseudo_atomic_interrupted(context);
}
else {
fake_foreign_function_call(context);
funcall0(SymbolFunction(MAYBE_GC));
undo_fake_foreign_function_call(context);
}
return TRUE;
}else
return FALSE;
}
/****************************************************************\
* Noise to install handlers. *
\****************************************************************/
void interrupt_install_low_level_handler
(int signal,
#ifdef POSIX_SIGS
struct sigaction sa;
sa.sa_sigaction=handler;
sigemptyset(&sa.sa_mask);
FILLBLOCKSET(&sa.sa_mask);
sa.sa_flags = SA_RESTART | SA_SIGINFO;
sigaction(signal, &sa, NULL);
#else
struct sigvec sv;
sv.sv_handler=handler;
sv.sv_mask=BLOCKABLE;
sv.sv_flags=0;
sigvec(signal,&sv,NULL);
interrupt_low_level_handlers[signal]=(handler==SIG_DFL ? 0 : handler);
}
unsigned long install_handler(int signal,
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void handler(HANDLER_ARGS))
#ifdef POSIX_SIGS
{
struct sigaction sa;
sigset_t old,new;
union interrupt_handler oldhandler;
sigemptyset(&new);
sigaddset(&new, signal);
sigprocmask(SIG_BLOCK, &new, &old);
sigemptyset(&new);
FILLBLOCKSET(&new);
if(interrupt_low_level_handlers[signal]==0){
if(handler==SIG_DFL || 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;
sigemptyset(&sa.sa_mask);
FILLBLOCKSET(&sa.sa_mask);
sa.sa_flags = SA_SIGINFO | SA_RESTART;
sigaction(signal, &sa, NULL);
}
oldhandler = interrupt_handlers[signal];
interrupt_handlers[signal].c = handler;
sigprocmask(SIG_SETMASK, &old, 0);
return (unsigned long)oldhandler.lisp;
}
#else
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{
struct sigvec sv;
int oldmask;
union interrupt_handler oldhandler;
oldmask = sigblock(sigmask(signal));
if(interrupt_low_level_handlers[signal]==0){
if(handler==SIG_DFL || handler==SIG_IGN)
sv.sv_handler = handler;
else if (sigmask(signal)&BLOCKABLE)
sv.sv_handler = maybe_now_maybe_later;
else
sv.sv_handler = interrupt_handle_now;
sv.sv_mask = BLOCKABLE;
sv.sv_flags = 0;
sigvec(signal, &sv, NULL);
}
oldhandler = interrupt_handlers[signal];
interrupt_handlers[signal].c = handler;
sigsetmask(oldmask);
return (unsigned long)oldhandler.lisp;
}