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>
32 #include "interrupt.h"
35 #include <sys/socket.h>
36 #include <sys/utsname.h>
38 #include <sys/types.h>
40 /* #include <sys/sysinfo.h> */
44 #include <linux/version.h>
48 size_t os_vm_page_size;
50 #ifdef LISP_FEATURE_SB_FUTEX
51 #include <linux/unistd.h>
54 /* values taken from the kernel's linux/futex.h. This header file
55 doesn't exist in userspace, which is our excuse for not grovelling
57 #define FUTEX_WAIT (0)
58 #define FUTEX_WAKE (1)
60 #define FUTEX_REQUEUE (3)
62 #define __NR_sys_futex __NR_futex
64 _syscall4(int,sys_futex,
68 struct timespec *, rel);
73 int linux_sparc_siginfo_bug = 0;
74 int linux_supports_futex=0;
78 /* Conduct various version checks: do we have enough mmap(), is
79 * this a sparc running 2.2, can we do threads? */
87 major_version = atoi(p);
89 minor_version = atoi(p);
90 if (major_version<2) {
91 lose("linux kernel version too old: major version=%d (can't run in version < 2.0.0)",
94 if (!(major_version>2 || minor_version >= 4)) {
95 #ifdef LISP_FEATURE_SB_THREAD
96 lose("linux kernel 2.4 required for thread-enabled SBCL");
98 #ifdef LISP_FEATURE_SPARC
99 FSHOW((stderr,"linux kernel %d.%d predates 2.4;\n enabling workarounds for SPARC kernel bugs in signal handling.\n", major_version,minor_version));
100 linux_sparc_siginfo_bug = 1;
103 #ifdef LISP_FEATURE_SB_FUTEX
104 futex_wait(futex,-1);
105 if(errno!=ENOSYS) linux_supports_futex=1;
107 os_vm_page_size = getpagesize();
111 #ifdef LISP_FEATURE_ALPHA
112 /* The Alpha is a 64 bit CPU. SBCL is a 32 bit application. Due to all
113 * the places that assume we can get a pointer into a fixnum with no
114 * information loss, we have to make sure it allocates all its ram in the
117 static void * under_2gb_free_pointer=DYNAMIC_1_SPACE_END;
121 os_validate(os_vm_address_t addr, os_vm_size_t len)
123 int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE;
124 os_vm_address_t actual ;
128 #ifdef LISP_FEATURE_ALPHA
131 addr=under_2gb_free_pointer;
134 actual = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
135 if (actual == MAP_FAILED || (addr && (addr!=actual))) {
137 return 0; /* caller should check this */
140 #ifdef LISP_FEATURE_ALPHA
142 len=(len+(os_vm_page_size-1))&(~(os_vm_page_size-1));
143 under_2gb_free_pointer+=len;
150 os_invalidate(os_vm_address_t addr, os_vm_size_t len)
152 if (munmap(addr,len) == -1) {
158 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
160 addr = mmap(addr, len,
162 MAP_PRIVATE | MAP_FILE | MAP_FIXED,
165 if (addr == MAP_FAILED) {
167 lose("unexpected mmap(..) failure");
174 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
176 if (mprotect(address, length, prot) == -1) {
181 /* FIXME: Now that FOO_END, rather than FOO_SIZE, is the fundamental
182 * description of a space, we could probably punt this and just do
183 * (FOO_START <= x && x < FOO_END) everywhere it's called. */
185 in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
187 char* beg = (char*)((long)sbeg);
188 char* end = (char*)((long)sbeg) + slen;
189 char* adr = (char*)a;
190 return (adr >= beg && adr < end);
194 is_valid_lisp_addr(os_vm_address_t addr)
197 if(in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
198 in_range_p(addr, STATIC_SPACE_START , STATIC_SPACE_SIZE) ||
199 in_range_p(addr, DYNAMIC_SPACE_START , DYNAMIC_SPACE_SIZE))
201 for_each_thread(th) {
202 if((th->control_stack_start <= addr) && (addr < th->control_stack_end))
204 if(in_range_p(addr, th->binding_stack_start, BINDING_STACK_SIZE))
211 * any OS-dependent special low-level handling for signals
215 #if defined LISP_FEATURE_GENCGC
218 * The GENCGC needs to be hooked into whatever signal is raised for
219 * page fault on this OS.
222 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
224 os_context_t *context = arch_os_get_context(&void_context);
225 void* fault_addr = (void*)info->si_addr;
226 if (!gencgc_handle_wp_violation(fault_addr))
227 if(!handle_control_stack_guard_triggered(context,fault_addr))
228 interrupt_handle_now(signal, info, void_context);
234 sigsegv_handler(int signal, siginfo_t *info, void* void_context)
236 os_context_t *context = arch_os_get_context(&void_context);
237 os_vm_address_t addr;
239 addr = arch_get_bad_addr(signal,info,context);
241 *os_context_register_addr(context,reg_ALLOC) & (1L<<63)){
243 /* Alpha stuff: This is the end of a pseudo-atomic section
244 * during which a signal was received. We must deal with the
245 * pending interrupt (see also interrupt.c,
246 * ../code/interrupt.lisp)
248 /* (how we got here: when interrupting, we set bit 63 in
249 * reg_Alloc. At the end of the atomic section we tried to
250 * write to reg_ALLOC, got a SIGSEGV (there's nothing mapped
251 * there) so ended up here
253 *os_context_register_addr(context,reg_ALLOC) -= (1L<<63);
254 interrupt_handle_pending(context);
256 if(!interrupt_maybe_gc(signal, info, context))
257 if(!handle_control_stack_guard_triggered(context,addr))
258 interrupt_handle_now(signal, info, context);
263 void sigcont_handler(int signal, siginfo_t *info, void *void_context)
265 /* We need to have a handler installed for this signal so that
266 * sigwaitinfo() for it actually returns at the appropriate time.
267 * We don't need it to actually do anything. This mkes it
268 * possibly the only signal handler in SBCL that doesn't depend on
269 * not-guaranteed-by-POSIX features
274 os_install_interrupt_handlers(void)
276 undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
278 #ifdef LISP_FEATURE_SB_THREAD
279 undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
280 interrupt_thread_handler);
281 undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
282 sig_stop_for_gc_handler);
283 undoably_install_low_level_interrupt_handler(SIG_THREAD_EXIT,
284 thread_exit_handler);
285 if(!linux_supports_futex)
286 undoably_install_low_level_interrupt_handler(SIG_DEQUEUE,
291 #ifdef LISP_FEATURE_SB_FUTEX
292 int futex_wait(int *lock_word, int oldval) {
293 int t= sys_futex(lock_word,FUTEX_WAIT,oldval, 0);
296 int futex_wake(int *lock_word, int n){
297 return sys_futex(lock_word,FUTEX_WAKE,n,0);