#include <stdio.h>
#include <sys/param.h>
#include <sys/file.h>
+#include "sbcl.h"
#include "./signal.h"
#include "os.h"
#include "arch.h"
#include "interrupt.h"
#include "interr.h"
#include "lispregs.h"
-#include "sbcl.h"
+#include "runtime.h"
+#include "genesis/static-symbols.h"
+#include "genesis/fdefn.h"
#include <sys/socket.h>
#include <sys/utsname.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <unistd.h>
+#include <linux/version.h>
#include "validate.h"
#include "thread.h"
size_t os_vm_page_size;
+#ifdef LISP_FEATURE_SB_THREAD
+#include <linux/unistd.h>
+#include <errno.h>
+
+/* values taken from the kernel's linux/futex.h. This header file
+ doesn't exist in userspace, which is our excuse for not grovelling
+ them automatically */
+#define FUTEX_WAIT (0)
+#define FUTEX_WAKE (1)
+#define FUTEX_FD (2)
+#define FUTEX_REQUEUE (3)
+
+#define __NR_sys_futex __NR_futex
+
+_syscall4(int,sys_futex,
+ int *, futex,
+ int, op,
+ int, val,
+ struct timespec *, rel);
+#endif
+
#include "gc.h"
\f
+int linux_sparc_siginfo_bug = 0;
+int linux_no_threads_p = 0;
-#ifdef sparc
-int early_kernel = 0;
-#endif
void os_init(void)
{
- /* Early versions of Linux don't support the mmap(..) functionality
- * that we need. */
- {
- struct utsname name;
- int major_version;
-#ifdef sparc
- int minor_version;
-#endif
- uname(&name);
- major_version = atoi(name.release);
- if (major_version < 2) {
- lose("linux major version=%d (can't run in version < 2.0.0)",
- major_version);
- }
-#ifdef sparc
- /* KLUDGE: This will break if Linux moves to a uname() version number
- * that has more than one digit initially -- CSR, 2002-02-12 */
- minor_version = atoi(name.release+2);
- if (minor_version < 4) {
- FSHOW((stderr,"linux minor version=%d;\n enabling workarounds for SPARC kernel bugs in signal handling.\n", minor_version));
- early_kernel = 1;
- }
+ /* Conduct various version checks: do we have enough mmap(), is
+ * this a sparc running 2.2, can we do threads? */
+ int *futex=0;
+ struct utsname name;
+ int major_version;
+ int minor_version;
+ char *p;
+ uname(&name);
+ p=name.release;
+ major_version = atoi(p);
+ p=strchr(p,'.')+1;
+ minor_version = atoi(p);
+ if (major_version<2) {
+ lose("linux kernel version too old: major version=%d (can't run in version < 2.0.0)",
+ major_version);
+ }
+ if (!(major_version>2 || minor_version >= 4)) {
+#ifdef LISP_FEATURE_SPARC
+ FSHOW((stderr,"linux kernel %d.%d predates 2.4;\n enabling workarounds for SPARC kernel bugs in signal handling.\n", major_version,minor_version));
+ linux_sparc_siginfo_bug = 1;
#endif
}
-
- os_vm_page_size = getpagesize();
- /* This could just as well be in arch_init(), but it's not. */
-#ifdef __i386__
- /* FIXME: This used to be here. However, I have just removed it
- with no apparent ill effects (it may be that earlier kernels
- started up a process with a different set of traps, or
- something?) Find out what this was meant to do, and reenable it
- or delete it if possible. -- CSR, 2002-07-15 */
- /* SET_FPU_CONTROL_WORD(0x1372|4|8|16|32); no interrupts */
+#ifdef LISP_FEATURE_SB_THREAD
+ futex_wait(futex,-1);
+ if(errno==ENOSYS) linux_no_threads_p = 1;
+ if(linux_no_threads_p)
+ fprintf(stderr,"Linux with NPTL support (e.g. kernel 2.6 or newer) required for \nthread-enabled SBCL. Disabling thread support.\n\n");
#endif
+ os_vm_page_size = getpagesize();
}
-/* In Debian CMU CL ca. 2.4.9, it was possible to get an infinite
- * cascade of errors from do_mmap(..). This variable is a counter to
- * prevent that; when it counts down to zero, an error in do_mmap
- * causes the low-level monitor to be called. */
-int n_do_mmap_ignorable_errors = 3;
-/* Return 0 for success. */
-static int
-do_mmap(os_vm_address_t *addr, os_vm_size_t len, int flags)
-{
- /* We *must* have the memory where we expect it. */
- os_vm_address_t old_addr = *addr;
-
- *addr = mmap(*addr, len, OS_VM_PROT_ALL, flags, -1, 0);
- if (*addr == MAP_FAILED ||
- ((old_addr != NULL) && (*addr != old_addr))) {
- FSHOW((stderr,
- "/retryable error in allocating memory from the OS\n"
- "(addr=0x%lx, len=0x%lx, flags=0x%lx)\n",
- (long) addr,
- (long) len,
- (long) flags));
- if (n_do_mmap_ignorable_errors > 0) {
- --n_do_mmap_ignorable_errors;
- } else {
- lose("too many errors in allocating memory from the OS");
- }
- perror("mmap");
- return 1;
- }
- return 0;
-}
+#ifdef LISP_FEATURE_ALPHA
+/* The Alpha is a 64 bit CPU. SBCL is a 32 bit application. Due to all
+ * the places that assume we can get a pointer into a fixnum with no
+ * information loss, we have to make sure it allocates all its ram in the
+ * 0-2Gb region. */
+
+static void * under_2gb_free_pointer=DYNAMIC_1_SPACE_END;
+#endif
os_vm_address_t
os_validate(os_vm_address_t addr, os_vm_size_t len)
{
- if (addr) {
- int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED;
- os_vm_address_t base_addr = addr;
- do {
- /* KLUDGE: It looks as though this code allocates memory
- * in chunks of size no larger than 'magic', but why? What
- * is the significance of 0x1000000 here? Also, can it be
- * right that if the first few 'do_mmap' calls succeed,
- * then one fails, we leave the memory allocated by the
- * first few in place even while we return a code for
- * complete failure? -- WHN 19991020
- *
- * Peter Van Eynde writes (20000211)
- * This was done because the kernel would only check for
- * overcommit for every allocation seperately. So if you
- * had 16MB of free mem+swap you could allocate 16M. And
- * again, and again, etc.
- * This in [Linux] 2.X could be bad as they changed the memory
- * system. A side effect was/is (I don't really know) that
- * programs with a lot of memory mappings run slower. But
- * of course for 2.2.2X we now have the NO_RESERVE flag that
- * helps...
- *
- * FIXME: The logic is also flaky w.r.t. failed
- * allocations. If we make one or more successful calls to
- * do_mmap(..) before one fails, then we've allocated
- * memory, and we should ensure that it gets deallocated
- * sometime somehow. If this function's response to any
- * failed do_mmap(..) is to give up and return NULL (as in
- * sbcl-0.6.7), then any failed do_mmap(..) after any
- * successful do_mmap(..) causes a memory leak. */
- int magic = 0x1000000;
- if (len <= magic) {
- if (do_mmap(&addr, len, flags)) {
- return NULL;
- }
- len = 0;
- } else {
- if (do_mmap(&addr, magic, flags)) {
- return NULL;
- }
- addr += magic;
- len = len - magic;
- }
- } while (len > 0);
- return base_addr;
- } else {
- int flags = MAP_PRIVATE | MAP_ANONYMOUS;
- if (do_mmap(&addr, len, flags)) {
- return NULL;
- } else {
- return addr;
- }
+ int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
+ os_vm_address_t actual ;
+
+ if (addr)
+ flags |= MAP_FIXED;
+#ifdef LISP_FEATURE_ALPHA
+ else {
+ flags |= MAP_FIXED;
+ addr=under_2gb_free_pointer;
}
+#endif
+ actual = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
+ if (actual == MAP_FAILED || (addr && (addr!=actual))) {
+ perror("mmap");
+ return 0; /* caller should check this */
+ }
+
+#ifdef LISP_FEATURE_ALPHA
+
+ len=(len+(os_vm_page_size-1))&(~(os_vm_page_size-1));
+ under_2gb_free_pointer+=len;
+#endif
+
+ return actual;
}
void
sigsegv_handler(int signal, siginfo_t *info, void* void_context)
{
os_context_t *context = arch_os_get_context(&void_context);
- void* fault_addr = (void*)context->uc_mcontext.cr2;
+ void* fault_addr = (void*)info->si_addr;
if (!gencgc_handle_wp_violation(fault_addr))
- if(!handle_control_stack_guard_triggered(context,fault_addr))
- interrupt_handle_now(signal, info, void_context);
+ if(!handle_guard_page_triggered(context,fault_addr))
+#ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
+ arrange_return_to_lisp_function(context, SymbolFunction(MEMORY_FAULT_ERROR));
+#else
+ interrupt_handle_now(signal, info, context);
+#endif
}
#else
interrupt_handle_pending(context);
} else {
if(!interrupt_maybe_gc(signal, info, context))
- if(!handle_control_stack_guard_triggered(context,addr))
+ if(!handle_guard_page_triggered(context,addr))
interrupt_handle_now(signal, info, context);
}
}
void sigcont_handler(int signal, siginfo_t *info, void *void_context)
{
- /* we need to have a handler installed for this signal so that
- * sigwaitinfo() for it actually returns at the appropriate time
- */
+ /* We need to have a handler installed for this signal so that
+ * sigwaitinfo() for it actually returns at the appropriate time.
+ * We don't need it to actually do anything. This mkes it
+ * possibly the only signal handler in SBCL that doesn't depend on
+ * not-guaranteed-by-POSIX features
+ */
}
void
{
undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
sigsegv_handler);
- undoably_install_low_level_interrupt_handler(SIGCONT,
- sigcont_handler);
+#ifdef LISP_FEATURE_SB_THREAD
+ undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
+ interrupt_thread_handler);
+ undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
+ sig_stop_for_gc_handler);
+ undoably_install_low_level_interrupt_handler(SIG_THREAD_EXIT,
+ thread_exit_handler);
+#endif
}
+#ifdef LISP_FEATURE_SB_THREAD
+int futex_wait(int *lock_word, int oldval) {
+ int t= sys_futex(lock_word,FUTEX_WAIT,oldval, 0);
+ return t;
+}
+int futex_wake(int *lock_word, int n){
+ return sys_futex(lock_word,FUTEX_WAKE,n,0);
+}
+#endif
projects / sbcl.git / blobdiff