2 * OS-dependent routines for FreeBSD (and could maybe be extended to all BSD?)
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.
26 #include <sys/param.h>
32 #include "interrupt.h"
36 #include <sys/types.h>
38 /* #include <sys/sysinfo.h> */
41 vm_size_t os_vm_page_size;
47 /* The different BSD variants have diverged in exactly where they
48 * store signal context information, but at least they tend to use the
49 * same stems to name the structure fields, so by using this macro we
50 * can share a fair amount of code between different variants. */
51 #if defined __FreeBSD__
52 #define CONTEXT_ADDR_FROM_STEM(stem) &context->uc_mcontext.mc_ ## stem
53 #elif defined __OpenBSD__
54 #define CONTEXT_ADDR_FROM_STEM(stem) &context->sc_ ## stem
56 #error unsupported BSD variant
62 os_vm_page_size = getpagesize();
65 /* KLUDGE: There is strong family resemblance in the signal context
66 * stuff in FreeBSD and OpenBSD, but in detail they're different in
67 * almost every line of code. It would be nice to find some way to
68 * factor out the commonality better; failing that, it might be best
69 * just to split this generic-BSD code into one variant for each BSD. */
72 os_context_register_addr(os_context_t *context, int offset)
76 return CONTEXT_ADDR_FROM_STEM(eax);
78 return CONTEXT_ADDR_FROM_STEM(ecx);
80 return CONTEXT_ADDR_FROM_STEM(edx);
82 return CONTEXT_ADDR_FROM_STEM(ebx);
84 return CONTEXT_ADDR_FROM_STEM(esp);
86 return CONTEXT_ADDR_FROM_STEM(ebp);
88 return CONTEXT_ADDR_FROM_STEM(esi);
90 return CONTEXT_ADDR_FROM_STEM(edi);
97 os_context_pc_addr(os_context_t *context)
99 #if defined __FreeBSD__
100 return CONTEXT_ADDR_FROM_STEM(eip);
101 #elif defined __OpenBSD__
102 return CONTEXT_ADDR_FROM_STEM(pc);
104 #error unsupported BSD variant
109 os_context_sp_addr(os_context_t *context)
111 return CONTEXT_ADDR_FROM_STEM(esp);
115 os_context_sigmask_addr(os_context_t *context)
117 /* (Unlike most of the other context fields that we access, the
118 * signal mask field is a field of the basic, outermost context
119 * struct itself both in FreeBSD 4.0 and in OpenBSD 2.6.) */
120 #if defined __FreeBSD__
121 return &context->uc_sigmask;
122 #elif defined __OpenBSD__
123 return &context->sc_mask;
125 #error unsupported BSD variant
130 os_validate(os_vm_address_t addr, os_vm_size_t len)
132 int flags = MAP_PRIVATE | MAP_ANON;
137 addr = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
139 if (addr == MAP_FAILED) {
148 os_invalidate(os_vm_address_t addr, os_vm_size_t len)
150 if (munmap(addr, len) == -1)
155 os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
157 addr = mmap(addr, len,
159 MAP_PRIVATE | MAP_FILE | MAP_FIXED,
162 if (addr == MAP_FAILED) {
164 lose("unexpected mmap(..) failure");
171 os_flush_icache(os_vm_address_t address, os_vm_size_t length)
176 os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
178 if (mprotect(address, length, prot) == -1) {
184 in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
186 char* beg = (char*) sbeg;
187 char* end = (char*) sbeg + slen;
188 char* adr = (char*) a;
189 return (adr >= beg && adr < end);
193 is_valid_lisp_addr(os_vm_address_t addr)
195 return 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_0_SPACE_START, DYNAMIC_SPACE_SIZE )
198 || in_range_p(addr, DYNAMIC_1_SPACE_START, DYNAMIC_SPACE_SIZE )
199 || in_range_p(addr, CONTROL_STACK_START , CONTROL_STACK_SIZE )
200 || in_range_p(addr, BINDING_STACK_START , BINDING_STACK_SIZE );
204 * any OS-dependent special low-level handling for signals
210 os_install_interrupt_handlers(void)
216 * The GENCGC needs to be hooked into whatever signal is raised for
217 * page fault on this OS.
220 memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context)
222 /* The way that we extract low level information like the fault
223 * address is not specified by POSIX. */
224 #if defined __FreeBSD__
225 void *fault_addr = siginfo->si_addr;
226 #elif defined __OpenBSD__
227 void *fault_addr = siginfo->si_addr;
229 #error unsupported BSD variant
231 if (!gencgc_handle_wp_violation(fault_addr)) {
232 interrupt_handle_now(signal, siginfo, void_context);
236 os_install_interrupt_handlers(void)
238 #if defined __FreeBSD__
239 interrupt_install_low_level_handler(SIGBUS, memory_fault_handler);
240 #elif defined __OpenBSD__
241 interrupt_install_low_level_handler(SIGSEGV, memory_fault_handler);
243 #error unsupported BSD variant
247 #endif /* !defined GENCGC */