#include "gencgc-internal.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>
+#include <sys/syscall.h>
+#include <unistd.h>
#include <errno.h>
/* values taken from the kernel's linux/futex.h. This header file
#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);
+#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);
+}
int
futex_wait(int *lock_word, int oldval)
int linux_sparc_siginfo_bug = 0;
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(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? */
}
#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");
+ if(errno==ENOSYS) {
+ lose("This version of SBCL is compiled with threading support, but your kernel is too old to support this.\n\
+Please use a more recent kernel or a version of SBCL without threading support.\n");
+ }
+ if(! isnptl()) {
+ lose("This version of SBCL only works correctly with the NPTL threading library. Please use a newer glibc, use an older SBCL, or stop using LD_ASSUME_KERNEL");
+ }
#endif
os_vm_page_size = getpagesize();
+
+ /* 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.
+ */
+#ifdef LISP_FEATURE_X86
+ if ((major_version == 2 && minor_version >= 6)
+ || 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 (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) {
+ runtime[i] = '\0';
+ execve(runtime, argv, envp);
+ }
+ }
+ /* 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: Couldn't re-execute SBCL with the proper personality flags (maybe /proc isn't mounted?). Trying to continue anyway.\n");
+ }
+ }
+#endif
}
}
#endif
actual = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
- if (actual == MAP_FAILED || (addr && (addr!=actual))) {
+ 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
len=(len+(os_vm_page_size-1))&(~(os_vm_page_size-1));