#include "runtime.h"
#include "genesis/static-symbols.h"
#include "genesis/fdefn.h"
+
#include <sys/socket.h>
#include <sys/utsname.h>
+#include <errno.h>
#include <sys/types.h>
#include <signal.h>
#include "validate.h"
#include "thread.h"
+#include "gc.h"
+#if defined LISP_FEATURE_GENCGC
+#include "gencgc-internal.h"
+#else
+#include "cheneygc-internal.h"
+#endif
+#include <fcntl.h>
+#ifdef LISP_FEATURE_SB_WTIMER
+# include <sys/timerfd.h>
+#endif
+
+#ifdef LISP_FEATURE_X86
+/* Prototype for personality(2). Done inline here since the header file
+ * for this isn't available on old versions of glibc. */
+int personality (unsigned long);
+#endif
+
size_t os_vm_page_size;
-#ifdef LISP_FEATURE_SB_THREAD
-#include <linux/unistd.h>
+#if defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_SB_FUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
+#include <sys/syscall.h>
+#include <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_WAIT 0
+#define FUTEX_WAKE 1
+/* This is also copied from linux/futex.h so that a binary compiled on
+ * a not so recent Linux system can still take advantage of private
+ * futexes when available.*/
+#define FUTEX_WAIT_PRIVATE (0+128)
+#define FUTEX_WAKE_PRIVATE (1+128)
#define FUTEX_FD (2)
#define FUTEX_REQUEUE (3)
-#define __NR_sys_futex __NR_futex
+/* Not static so that Lisp may query it. */
+boolean futex_private_supported_p;
+
+static inline int
+futex_wait_op()
+{
+ return (futex_private_supported_p ? FUTEX_WAIT_PRIVATE : FUTEX_WAIT);
+}
+
+static inline int
+futex_wake_op()
+{
+ return (futex_private_supported_p ? FUTEX_WAKE_PRIVATE : FUTEX_WAKE);
+}
+
+#define sys_futex sbcl_sys_futex
+static inline int sys_futex (void *futex, int op, int val, struct timespec *rel)
+{
+ return syscall (SYS_futex, futex, op, val, rel);
+}
+
+static void
+futex_init()
+{
+ int x = 0;
+ sys_futex(&x, FUTEX_WAIT, 1, 0);
+ if (errno == ENOSYS)
+ lose("This version of SBCL is compiled with threading support, but your kernel\n"
+ "is too old to support this. Please use a more recent kernel or\n"
+ "a version of SBCL without threading support.\n");
+ sys_futex(&x, FUTEX_WAIT_PRIVATE, 1, 0);
+ if (errno == EWOULDBLOCK) {
+ futex_private_supported_p = 1;
+ } else {
+ futex_private_supported_p = 0;
+ SHOW("No futex private suppport\n");
+ }
+}
-_syscall4(int,sys_futex,
- int *, futex,
- int, op,
- int, val,
- struct timespec *, rel);
+int
+futex_wait(int *lock_word, int oldval, long sec, unsigned long usec)
+{
+ struct timespec timeout;
+ int t;
+
+ if (sec<0) {
+ t = sys_futex(lock_word, futex_wait_op(), oldval, 0);
+ }
+ else {
+ timeout.tv_sec = sec;
+ timeout.tv_nsec = usec * 1000;
+ t = sys_futex(lock_word, futex_wait_op(), oldval, &timeout);
+ }
+ if (t==0)
+ return 0;
+ else if (errno==ETIMEDOUT)
+ return 1;
+ else if (errno==EINTR)
+ return 2;
+ else
+ /* EWOULDBLOCK and others, need to check the lock */
+ return -1;
+}
+
+int
+futex_wake(int *lock_word, int n)
+{
+ return sys_futex(lock_word, futex_wake_op(),n,0);
+}
#endif
-#include "gc.h"
\f
int linux_sparc_siginfo_bug = 0;
-void os_init(void)
+/* This variable was in real use for a few months, basically for
+ * storing autodetected information about whether the Linux
+ * installation was recent enough to support SBCL threads, and make
+ * some run-time decisions based on that. But this turned out to be
+ * unstable, so now we just flat-out refuse to start on the old installations
+ * when thread support has been compiled in.
+ *
+ * Unfortunately, in the meanwhile Slime started depending on this
+ * variable for deciding which communication style to use. So even
+ * though this variable looks unused, it shouldn't be deleted until
+ * it's no longer used in the versions of Slime that people are
+ * likely to download first. -- JES, 2006-06-07
+ */
+int linux_no_threads_p = 0;
+
+#ifdef LISP_FEATURE_SB_THREAD
+int
+isnptl (void)
+{
+ size_t n = confstr (_CS_GNU_LIBPTHREAD_VERSION, NULL, 0);
+ if (n > 0) {
+ char *buf = alloca (n);
+ confstr (_CS_GNU_LIBPTHREAD_VERSION, buf, n);
+ if (strstr (buf, "NPTL")) {
+ return 1;
+ }
+ }
+ return 0;
+}
+#endif
+
+void
+os_init(char *argv[], char *envp[])
{
/* 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;
+ int patch_version;
char *p;
uname(&name);
- p=name.release;
+
+ p=name.release;
major_version = atoi(p);
- p=strchr(p,'.')+1;
- minor_version = atoi(p);
+ minor_version = patch_version = 0;
+ p=strchr(p,'.');
+ if (p != NULL) {
+ minor_version = atoi(++p);
+ p=strchr(p,'.');
+ if (p != NULL)
+ patch_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);
+ lose("linux kernel version too old: major version=%d (can't run in version < 2.0.0)\n",
+ 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;
+ 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
}
#ifdef LISP_FEATURE_SB_THREAD
- futex_wait(futex,-1);
- if(errno==ENOSYS) {
- lose("linux with NPTL support (e.g. kernel 2.6 or newer) required for thread-enabled SBCL");
+#if defined(LISP_FEATURE_SB_FUTEX) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
+ futex_init();
+#endif
+ if(! isnptl()) {
+ lose("This version of SBCL only works correctly with the NPTL threading\n"
+ "library. Please use a newer glibc, use an older SBCL, or stop using\n"
+ "LD_ASSUME_KERNEL\n");
+ }
+#endif
+
+ /* Don't use getpagesize(), since it's not constant across Linux
+ * kernel versions on some architectures (for example PPC). FIXME:
+ * possibly the same should be done on other architectures too.
+ */
+ os_vm_page_size = BACKEND_PAGE_BYTES;
+
+ /* KLUDGE: Disable memory randomization on new Linux kernels
+ * by setting a personality flag and re-executing. (We need
+ * to re-execute, since the memory maps that can conflict with
+ * the SBCL spaces have already been done at this point).
+ *
+ * Since randomization is currently implemented only on x86 kernels,
+ * don't do this trick on other platforms.
+ */
+#if defined(LISP_FEATURE_X86) || defined(LISP_FEATURE_X86_64)
+ if ((major_version == 2
+ /* Some old kernels will apparently lose unsupported personality flags
+ * on exec() */
+ && ((minor_version == 6 && patch_version >= 11)
+ || (minor_version > 6)
+ /* This is what RHEL 3 reports */
+ || (minor_version == 4 && patch_version > 20)))
+ || major_version >= 3)
+ {
+ int pers = personality(0xffffffffUL);
+ /* 0x40000 aka. ADDR_NO_RANDOMIZE */
+ if (!(pers & 0x40000)) {
+ int retval = personality(pers | 0x40000);
+ /* Allegedly some Linux kernels (the reported case was
+ * "hardened Linux 2.6.7") won't set the new personality,
+ * but nor will they return -1 for an error. So as a
+ * workaround query the new personality...
+ */
+ int newpers = personality(0xffffffffUL);
+ /* ... and don't re-execute if either the setting resulted
+ * in an error or if the value didn't change. Otherwise
+ * this might result in an infinite loop.
+ */
+
+ if (!getenv("SBCL_IS_RESTARTING") &&
+ retval != -1 && newpers != pers) {
+ /* Use /proc/self/exe instead of trying to figure out
+ * the executable path from PATH and argv[0], since
+ * that's unreliable. We follow the symlink instead of
+ * executing the file directly in order to prevent top
+ * from displaying the name of the process as "exe". */
+ char runtime[PATH_MAX+1];
+ int i = readlink("/proc/self/exe", runtime, PATH_MAX);
+ if (i != -1) {
+ environ = envp;
+ setenv("SBCL_IS_RESTARTING", "T", 1);
+ runtime[i] = '\0';
+ execv(runtime, argv);
+ }
+ }
+ /* Either changing the personality or execve() failed. Either
+ * way we might as well continue, and hope that the random
+ * memory maps are ok this time around.
+ */
+ fprintf(stderr, "WARNING:\
+\nCouldn't re-execute SBCL with proper personality flags (/proc isn't mounted? setuid?)\
+\nTrying to continue anyway.\n");
+ } else {
+ unsetenv("SBCL_IS_RESTARTING");
+ }
}
+#ifdef LISP_FEATURE_X86
+ /* Use SSE detector. Recent versions of Linux enable SSE support
+ * on SSE capable CPUs. */
+ /* FIXME: Are there any old versions that does not support SSE? */
+ fast_bzero_pointer = fast_bzero_detect;
+#endif
#endif
- os_vm_page_size = getpagesize();
}
#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
+ * 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. */
os_validate(os_vm_address_t addr, os_vm_size_t len)
{
int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
- os_vm_address_t actual ;
+ os_vm_address_t actual;
- if (addr)
- flags |= MAP_FIXED;
#ifdef LISP_FEATURE_ALPHA
- else {
- flags |= MAP_FIXED;
- addr=under_2gb_free_pointer;
+ if (!addr) {
+ addr=under_2gb_free_pointer;
}
-#endif
+#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 */
+ if (actual == MAP_FAILED) {
+ perror("mmap");
+ return 0; /* caller should check this */
+ }
+
+ if (addr && (addr!=actual)) {
+ fprintf(stderr, "mmap: wanted %lu bytes at %p, actually mapped at %p\n",
+ (unsigned long) len, addr, actual);
+ return 0;
}
#ifdef LISP_FEATURE_ALPHA
os_invalidate(os_vm_address_t addr, os_vm_size_t len)
{
if (munmap(addr,len) == -1) {
- perror("munmap");
+ perror("munmap");
}
}
os_vm_address_t
os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
{
- addr = mmap(addr, len,
- OS_VM_PROT_ALL,
- MAP_PRIVATE | MAP_FILE | MAP_FIXED,
- fd, (off_t) offset);
-
- if (addr == MAP_FAILED) {
- perror("mmap");
- lose("unexpected mmap(..) failure");
+ os_vm_address_t actual;
+
+ actual = mmap(addr, len, OS_VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED,
+ fd, (off_t) offset);
+ if (actual == MAP_FAILED || (addr && (addr != actual))) {
+ perror("mmap");
+ lose("unexpected mmap(..) failure\n");
}
- return addr;
+ return actual;
}
void
os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
{
if (mprotect(address, length, prot) == -1) {
- perror("mprotect");
+ if (errno == ENOMEM) {
+ lose("An mprotect call failed with ENOMEM. This probably means that the maximum amount\n"
+ "of separate memory mappings was exceeded. To fix the problem, either increase\n"
+ "the maximum with e.g. 'echo 262144 > /proc/sys/vm/max_map_count' or recompile\n"
+ "SBCL with a larger value for GENCGC-CARD-BYTES in\n"
+ "'src/compiler/target/backend-parms.lisp'.");
+ } else {
+ perror("mprotect");
+ }
}
}
\f
-/* FIXME: Now that FOO_END, rather than FOO_SIZE, is the fundamental
- * description of a space, we could probably punt this and just do
- * (FOO_START <= x && x < FOO_END) everywhere it's called. */
-static boolean
-in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
-{
- char* beg = (char*)((long)sbeg);
- char* end = (char*)((long)sbeg) + slen;
- char* adr = (char*)a;
- return (adr >= beg && adr < end);
-}
-
boolean
is_valid_lisp_addr(os_vm_address_t addr)
{
struct thread *th;
- if(in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
- in_range_p(addr, STATIC_SPACE_START , STATIC_SPACE_SIZE) ||
- in_range_p(addr, DYNAMIC_SPACE_START , DYNAMIC_SPACE_SIZE))
- return 1;
+ size_t ad = (size_t) addr;
+
+ if ((READ_ONLY_SPACE_START <= ad && ad < READ_ONLY_SPACE_END)
+ || (STATIC_SPACE_START <= ad && ad < STATIC_SPACE_END)
+#if defined LISP_FEATURE_GENCGC
+ || (DYNAMIC_SPACE_START <= ad && ad < DYNAMIC_SPACE_END)
+#else
+ || (DYNAMIC_0_SPACE_START <= ad && ad < DYNAMIC_0_SPACE_END)
+ || (DYNAMIC_1_SPACE_START <= ad && ad < DYNAMIC_1_SPACE_END)
+#endif
+ )
+ return 1;
for_each_thread(th) {
- if((th->control_stack_start <= addr) && (addr < th->control_stack_end))
- return 1;
- if(in_range_p(addr, th->binding_stack_start, BINDING_STACK_SIZE))
- return 1;
+ if((size_t)(th->control_stack_start) <= ad
+ && ad < (size_t)(th->control_stack_end))
+ return 1;
+ if((size_t)(th->binding_stack_start) <= ad
+ && ad < (size_t)(th->binding_stack_start + BINDING_STACK_SIZE))
+ return 1;
}
return 0;
}
* any OS-dependent special low-level handling for signals
*/
-
-#if defined LISP_FEATURE_GENCGC
-
/*
- * The GENCGC needs to be hooked into whatever signal is raised for
+ * The GC needs to be hooked into whatever signal is raised for
* page fault on this OS.
*/
-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*)info->si_addr;
- if (!gencgc_handle_wp_violation(fault_addr))
- 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
-
static void
-sigsegv_handler(int signal, siginfo_t *info, void* void_context)
+sigsegv_handler(int signal, siginfo_t *info, os_context_t *context)
{
- os_context_t *context = arch_os_get_context(&void_context);
- os_vm_address_t addr;
-
- addr = arch_get_bad_addr(signal,info,context);
- if (addr != NULL &&
- *os_context_register_addr(context,reg_ALLOC) & (1L<<63)){
-
- /* Alpha stuff: This is the end of a pseudo-atomic section
- * during which a signal was received. We must deal with the
- * pending interrupt (see also interrupt.c,
- * ../code/interrupt.lisp)
- */
- /* (how we got here: when interrupting, we set bit 63 in
- * reg_Alloc. At the end of the atomic section we tried to
- * write to reg_ALLOC, got a SIGSEGV (there's nothing mapped
- * there) so ended up here
- */
- *os_context_register_addr(context,reg_ALLOC) -= (1L<<63);
- interrupt_handle_pending(context);
- } else {
- if(!interrupt_maybe_gc(signal, info, context))
- if(!handle_guard_page_triggered(context,addr))
- interrupt_handle_now(signal, info, context);
+ os_vm_address_t addr = arch_get_bad_addr(signal, info, context);
+
+#ifdef LISP_FEATURE_ALPHA
+ /* Alpha stuff: This is the end of a pseudo-atomic section during
+ which a signal was received. We must deal with the pending
+ interrupt (see also interrupt.c, ../code/interrupt.lisp)
+
+ (how we got here: when interrupting, we set bit 63 in reg_ALLOC.
+ At the end of the atomic section we tried to write to reg_ALLOC,
+ got a SIGSEGV (there's nothing mapped there) so ended up here. */
+ if (addr != NULL &&
+ *os_context_register_addr(context, reg_ALLOC) & (1L<<63)) {
+ *os_context_register_addr(context, reg_ALLOC) -= (1L<<63);
+ interrupt_handle_pending(context);
+ return;
}
-}
#endif
-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 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
- */
+#ifdef LISP_FEATURE_SB_SAFEPOINT
+ if (!handle_safepoint_violation(context, addr))
+#endif
+
+#ifdef LISP_FEATURE_GENCGC
+ if (!gencgc_handle_wp_violation(addr))
+#else
+ if (!cheneygc_handle_wp_violation(context, addr))
+#endif
+ if (!handle_guard_page_triggered(context, addr))
+ lisp_memory_fault_error(context, addr);
}
void
os_install_interrupt_handlers(void)
{
undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
- sigsegv_handler);
+ sigsegv_handler);
+
+ /* OAOOM c.f. sunos-os.c.
+ * Should we have a reusable function gc_install_interrupt_handlers? */
#ifdef LISP_FEATURE_SB_THREAD
- undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
- interrupt_thread_handler);
+# ifdef LISP_FEATURE_SB_SAFEPOINT
+# ifdef LISP_FEATURE_SB_THRUPTION
+ undoably_install_low_level_interrupt_handler(SIGPIPE, thruption_handler);
+# endif
+# else
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);
+ sig_stop_for_gc_handler);
+# endif
#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;
+char *
+os_get_runtime_executable_path(int external)
+{
+ char path[PATH_MAX + 1];
+ int size;
+
+ size = readlink("/proc/self/exe", path, sizeof(path)-1);
+ if (size < 0)
+ return NULL;
+ else
+ path[size] = '\0';
+
+ return copied_string(path);
+}
+
+#ifdef LISP_FEATURE_SB_WTIMER
+/*
+ * Waitable timer implementation for the safepoint-based (SIGALRM-free)
+ * timer facility using timerfd_create().
+ */
+int
+os_create_wtimer()
+{
+ int fd = timerfd_create(CLOCK_MONOTONIC, 0);
+ if (fd == -1)
+ lose("os_create_wtimer: timerfd_create");
+
+ /* Cannot count on TFD_CLOEXEC availability, so do it manually: */
+ if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1)
+ lose("os_create_wtimer: fcntl");
+
+ return fd;
}
-int futex_wake(int *lock_word, int n){
- return sys_futex(lock_word,FUTEX_WAKE,n,0);
+
+int
+os_wait_for_wtimer(int fd)
+{
+ unsigned char buf[8];
+ int n = read(fd, buf, sizeof(buf));
+ if (n == -1) {
+ if (errno == EINTR)
+ return -1;
+ lose("os_wtimer_listen failed");
+ }
+ if (n != sizeof(buf))
+ lose("os_wtimer_listen read too little");
+ return 0;
+}
+
+void
+os_close_wtimer(int fd)
+{
+ if (close(fd) == -1)
+ lose("os_close_wtimer failed");
+}
+
+void
+os_set_wtimer(int fd, int sec, int nsec)
+{
+ struct itimerspec spec = { {0,0}, {0,0} };
+ spec.it_value.tv_sec = sec;
+ spec.it_value.tv_nsec = nsec;
+ if (timerfd_settime(fd, 0, &spec, 0) == -1)
+ lose("timerfd_settime");
+}
+
+void
+os_cancel_wtimer(int fd)
+{
+ os_set_wtimer(fd, 0, 0);
}
#endif
projects / sbcl.git / blobdiff