2 * OS-dependent routines for BSD-ish systems
4 * This file (along with os.h) exports an OS-independent interface to
5 * the operating system VM facilities. This interface looks a lot like
6 * the Mach interface (but simpler in some places). For some operating
7 * systems, a subset of these functions will have to be emulated.
11 * This software is part of the SBCL system. See the README file for
14 * This software is derived from the CMU CL system, which was
15 * written at Carnegie Mellon University and released into the
16 * public domain. The software is in the public domain and is
17 * provided with absolutely no warranty. See the COPYING and CREDITS
18 * files for more information.
22 #include <sys/param.h>
28 #include "interrupt.h"
34 #include <sys/types.h>
36 /* #include <sys/sysinfo.h> */
39 vm_size_t os_vm_page_size;
42 /* The different BSD variants have diverged in exactly where they
43 * store signal context information, but at least they tend to use the
44 * same stems to name the structure fields, so by using this macro we
45 * can share a fair amount of code between different variants. */
46 #if defined __FreeBSD__
47 #define CONTEXT_ADDR_FROM_STEM(stem) &context->uc_mcontext.mc_ ## stem
48 #elif defined __OpenBSD__
49 #define CONTEXT_ADDR_FROM_STEM(stem) &context->sc_ ## stem
51 #error unsupported BSD variant
57 os_vm_page_size = getpagesize();
60 /* KLUDGE: There is strong family resemblance in the signal context
61 * stuff in FreeBSD and OpenBSD, but in detail they're different in
62 * almost every line of code. It would be nice to find some way to
63 * factor out the commonality better; failing that, it might be best
64 * just to split this generic-BSD code into one variant for each BSD. */
67 os_context_register_addr(os_context_t *context, int offset)
71 return CONTEXT_ADDR_FROM_STEM(eax);
73 return CONTEXT_ADDR_FROM_STEM(ecx);
75 return CONTEXT_ADDR_FROM_STEM(edx);
77 return CONTEXT_ADDR_FROM_STEM(ebx);
79 return CONTEXT_ADDR_FROM_STEM(esp);
81 return CONTEXT_ADDR_FROM_STEM(ebp);
83 return CONTEXT_ADDR_FROM_STEM(esi);
85 return CONTEXT_ADDR_FROM_STEM(edi);
92 os_context_pc_addr(os_context_t *context)
94 #if defined __FreeBSD__
95 return CONTEXT_ADDR_FROM_STEM(eip);
96 #elif defined __OpenBSD__
97 return CONTEXT_ADDR_FROM_STEM(pc);
99 #error unsupported BSD variant
104 os_context_sp_addr(os_context_t *context)
106 return CONTEXT_ADDR_FROM_STEM(esp);
110 os_context_sigmask_addr(os_context_t *context)
112 /* (Unlike most of the other context fields that we access, the
113 * signal mask field is a field of the basic, outermost context
114 * struct itself both in FreeBSD 4.0 and in OpenBSD 2.6.) */
115 #if defined __FreeBSD__
116 return &context->uc_sigmask;
117 #elif defined __OpenBSD__
118 return &context->sc_mask;
120 #error unsupported BSD variant
125 os_validate(os_vm_address_t addr, os_vm_size_t len)
127 int flags = MAP_PRIVATE | MAP_ANON;
132 addr = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
134 if (addr == MAP_FAILED) {
143 os_invalidate(os_vm_address_t addr, os_vm_size_t len)
145 if (munmap(addr, len) == -1)
150 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
152 addr = mmap(addr, len,
154 MAP_PRIVATE | MAP_FILE | MAP_FIXED,
157 if (addr == MAP_FAILED) {
159 lose("unexpected mmap(..) failure");
165 /* FIXME: If this can be a no-op on BSD/x86, then it
166 * deserves a more precise name.
168 * (Perhaps os_prepare_data_area_to_be_executed()?) */
170 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
175 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
177 if (mprotect(address, length, prot) == -1) {
183 in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
185 char* beg = (char*) sbeg;
186 char* end = (char*) sbeg + slen;
187 char* adr = (char*) a;
188 return (adr >= beg && adr < end);
192 is_valid_lisp_addr(os_vm_address_t addr)
195 if(in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
196 in_range_p(addr, STATIC_SPACE_START , STATIC_SPACE_SIZE) ||
197 in_range_p(addr, DYNAMIC_SPACE_START , DYNAMIC_SPACE_SIZE))
199 for_each_thread(th) {
200 if((th->control_stack_start <= addr) && (addr < th->control_stack_end))
202 if(in_range_p(addr, th->binding_stack_start, BINDING_STACK_SIZE))
209 * any OS-dependent special low-level handling for signals
212 #if defined LISP_FEATURE_GENCGC
215 * The GENCGC needs to be hooked into whatever signal is raised for
216 * page fault on this OS.
219 memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context)
221 /* The way that we extract low level information like the fault
222 * address is not specified by POSIX. */
223 #if defined __FreeBSD__
224 void *fault_addr = siginfo->si_addr;
225 #elif defined __OpenBSD__
226 void *fault_addr = siginfo->si_addr;
228 #error unsupported BSD variant
230 os_context_t *context = arch_os_get_context(&void_context);
231 if (!gencgc_handle_wp_violation(fault_addr))
232 if(!handle_control_stack_guard_triggered(context,fault_addr))
233 /* FIXME is this context or void_context? not that it */
234 /* makes a difference currently except on linux/sparc */
235 interrupt_handle_now(signal, siginfo, void_context);
238 os_install_interrupt_handlers(void)
240 SHOW("os_install_interrupt_handlers()/bsd-os/defined(GENCGC)");
241 undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
242 memory_fault_handler);
243 SHOW("leaving os_install_interrupt_handlers()");
247 /* As of 2002.07.31, this configuration has never been tested */
249 os_install_interrupt_handlers(void)
251 SHOW("os_install_interrupt_handlers()/bsd-os/!defined(GENCGC)");
254 #endif /* defined GENCGC */
258 /* no threading in any *BSD variant on any CPU (yet? in sbcl-0.8.0 anyway) */
259 #ifdef LISP_FEATURE_SB_THREAD
260 #error "Define threading support functions"
262 struct thread *arch_os_get_current_thread() {
265 int arch_os_thread_init(struct thread *thread) {
266 return 1; /* success */
268 int arch_os_thread_cleanup(struct thread *thread) {
269 return 1; /* success */