2 * the Linux incarnation of OS-dependent routines. See also
3 * $(sbcl_arch)-linux-os.c
5 * This file (along with os.h) exports an OS-independent interface to
6 * the operating system VM facilities. Surprise surprise, this
7 * interface looks a lot like the Mach interface (but simpler in some
8 * places). For some operating systems, a subset of these functions
9 * will have to be emulated.
13 * This software is part of the SBCL system. See the README file for
16 * This software is derived from the CMU CL system, which was
17 * written at Carnegie Mellon University and released into the
18 * public domain. The software is in the public domain and is
19 * provided with absolutely no warranty. See the COPYING and CREDITS
20 * files for more information.
24 #include <sys/param.h>
31 #include "interrupt.h"
35 #include "genesis/static-symbols.h"
36 #include "genesis/fdefn.h"
37 #include <sys/socket.h>
38 #include <sys/utsname.h>
40 #include <sys/types.h>
42 /* #include <sys/sysinfo.h> */
46 #include <linux/version.h>
51 #if defined LISP_FEATURE_GENCGC
52 #include "gencgc-internal.h"
55 #ifdef LISP_FEATURE_LINUX
56 #include <sys/personality.h>
59 size_t os_vm_page_size;
61 #ifdef LISP_FEATURE_SB_THREAD
62 #include <sys/syscall.h>
66 /* values taken from the kernel's linux/futex.h. This header file
67 doesn't exist in userspace, which is our excuse for not grovelling
69 #define FUTEX_WAIT (0)
70 #define FUTEX_WAKE (1)
72 #define FUTEX_REQUEUE (3)
74 #define sys_futex sbcl_sys_futex
75 static inline int sys_futex (void *futex, int op, int val, struct timespec *rel)
77 return syscall (SYS_futex, futex, op, val, rel);
81 futex_wait(int *lock_word, int oldval)
83 int t= sys_futex(lock_word,FUTEX_WAIT,oldval, 0);
88 futex_wake(int *lock_word, int n)
90 return sys_futex(lock_word,FUTEX_WAKE,n,0);
95 int linux_sparc_siginfo_bug = 0;
96 int linux_no_threads_p = 0;
98 #ifdef LISP_FEATURE_SB_THREAD
101 size_t n = confstr (_CS_GNU_LIBPTHREAD_VERSION, NULL, 0);
104 char *buf = alloca (n);
105 confstr (_CS_GNU_LIBPTHREAD_VERSION, buf, n);
106 if (strstr (buf, "NPTL"))
114 os_init(char *argv[], char *envp[])
116 /* Conduct various version checks: do we have enough mmap(), is
117 * this a sparc running 2.2, can we do threads? */
118 #ifdef LISP_FEATURE_SB_THREAD
127 major_version = atoi(p);
129 minor_version = atoi(p);
130 if (major_version<2) {
131 lose("linux kernel version too old: major version=%d (can't run in version < 2.0.0)",
134 if (!(major_version>2 || minor_version >= 4)) {
135 #ifdef LISP_FEATURE_SPARC
136 FSHOW((stderr,"linux kernel %d.%d predates 2.4;\n enabling workarounds for SPARC kernel bugs in signal handling.\n", major_version,minor_version));
137 linux_sparc_siginfo_bug = 1;
140 #ifdef LISP_FEATURE_SB_THREAD
141 futex_wait(futex,-1);
143 lose("This version of sbcl is compiled with threading support, but your kernel is too old to support this.\n\
144 Please use a more recent kernel or a version of sbcl without threading support.\n");
147 lose("This version of sbcl only works correctly with the NPTL threading library. Please use a newer glibc, older sbcl or stop using LD_ASSUME_KERNEL");
150 os_vm_page_size = getpagesize();
152 /* KLUDGE: Disable memory randomization on new Linux kernels
153 * by setting a personality flag and re-executing. (We need
154 * to re-execute, since the memory maps that can conflict with
155 * the SBCL spaces have already been done at this point).
157 #if defined(LISP_FEATURE_X86)
158 if ((major_version == 2 && minor_version >= 6)
159 || major_version >= 3)
161 long pers = personality(-1);
162 /* 0x40000 aka. ADDR_NO_RANDOMIZE */
163 if (!(pers & 0x40000)) {
164 if (personality(pers | 0x40000) != -1) {
165 /* Use /proc/self/exe instead of trying to figure out the
166 * executable path from PATH and argv[0], since that's
167 * unreliable. We follow the symlink instead of executing
168 * the file directly to avoid top from displaying the
169 * name of the process as "exe".
171 char runtime[PATH_MAX+1];
172 int i = readlink("/proc/self/exe", runtime, PATH_MAX);
175 execve(runtime, argv, envp);
178 /* Either changing the personality or execve() failed. Either
179 * way we might as well continue, and hope that the random
180 * memory maps are ok this time around.
182 fprintf(stderr, "WARNING: Couldn't re-execute SBCL with the proper personality flags (maybe /proc isn't mounted?). Trying to continue anyway.\n");
189 #ifdef LISP_FEATURE_ALPHA
190 /* The Alpha is a 64 bit CPU. SBCL is a 32 bit application. Due to all
191 * the places that assume we can get a pointer into a fixnum with no
192 * information loss, we have to make sure it allocates all its ram in the
195 static void * under_2gb_free_pointer=DYNAMIC_1_SPACE_END;
199 os_validate(os_vm_address_t addr, os_vm_size_t len)
201 int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
202 os_vm_address_t actual;
204 #ifdef LISP_FEATURE_ALPHA
206 addr=under_2gb_free_pointer;
209 actual = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
210 if (actual == MAP_FAILED || (addr && (addr!=actual))) {
212 return 0; /* caller should check this */
215 #ifdef LISP_FEATURE_ALPHA
217 len=(len+(os_vm_page_size-1))&(~(os_vm_page_size-1));
218 under_2gb_free_pointer+=len;
225 os_invalidate(os_vm_address_t addr, os_vm_size_t len)
227 if (munmap(addr,len) == -1) {
233 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
235 os_vm_address_t actual;
237 actual = mmap(addr, len, OS_VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED,
239 if (actual == MAP_FAILED || (addr && (addr != actual))) {
241 lose("unexpected mmap(..) failure");
248 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
250 if (mprotect(address, length, prot) == -1) {
256 is_valid_lisp_addr(os_vm_address_t addr)
259 size_t ad = (size_t) addr;
261 if ((READ_ONLY_SPACE_START <= ad && ad < READ_ONLY_SPACE_END)
262 || (STATIC_SPACE_START <= ad && ad < STATIC_SPACE_END)
263 #if defined LISP_FEATURE_GENCGC
264 || (DYNAMIC_SPACE_START <= ad && ad < DYNAMIC_SPACE_END)
266 || (DYNAMIC_0_SPACE_START <= ad && ad < DYNAMIC_0_SPACE_END)
267 || (DYNAMIC_1_SPACE_START <= ad && ad < DYNAMIC_1_SPACE_END)
271 for_each_thread(th) {
272 if((size_t)(th->control_stack_start) <= ad
273 && ad < (size_t)(th->control_stack_end))
275 if((size_t)(th->binding_stack_start) <= ad
276 && ad < (size_t)(th->binding_stack_start + BINDING_STACK_SIZE))
283 * any OS-dependent special low-level handling for signals
287 #if defined LISP_FEATURE_GENCGC
290 * The GENCGC needs to be hooked into whatever signal is raised for
291 * page fault on this OS.
294 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
296 os_context_t *context = arch_os_get_context(&void_context);
297 void* fault_addr = (void*)info->si_addr;
298 if (!gencgc_handle_wp_violation(fault_addr))
299 if(!handle_guard_page_triggered(context,fault_addr))
300 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
301 arrange_return_to_lisp_function(context, SymbolFunction(MEMORY_FAULT_ERROR));
303 interrupt_handle_now(signal, info, context);
310 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
312 os_context_t *context = arch_os_get_context(&void_context);
313 os_vm_address_t addr = arch_get_bad_addr(signal,info,context);
315 #ifdef LISP_FEATURE_ALPHA
316 /* Alpha stuff: This is the end of a pseudo-atomic section during
317 which a signal was received. We must deal with the pending
318 interrupt (see also interrupt.c, ../code/interrupt.lisp)
320 (how we got here: when interrupting, we set bit 63 in reg_ALLOC.
321 At the end of the atomic section we tried to write to reg_ALLOC,
322 got a SIGSEGV (there's nothing mapped there) so ended up here. */
324 *os_context_register_addr(context,reg_ALLOC) & (1L<<63)){
325 *os_context_register_addr(context,reg_ALLOC) -= (1L<<63);
326 interrupt_handle_pending(context);
331 if(!interrupt_maybe_gc(signal, info, context))
332 if(!handle_guard_page_triggered(context,addr))
333 interrupt_handle_now(signal, info, context);
338 os_install_interrupt_handlers(void)
340 undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
342 #ifdef LISP_FEATURE_SB_THREAD
343 undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
344 interrupt_thread_handler);
345 undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
346 sig_stop_for_gc_handler);