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/*
* OS-dependent routines for BSD-ish systems
*
* This file (along with os.h) exports an OS-independent interface to
* the operating system VM facilities. This interface looks a lot like
* the Mach interface (but simpler in some places). For some operating
* systems, a subset of these functions will have to be emulated.
*/
/*
* This software is part of the SBCL system. See the README file for
* more information.
*
* This software is derived from the CMU CL system, which was
* written at Carnegie Mellon University and released into the
* public domain. The software is in the public domain and is
* provided with absolutely no warranty. See the COPYING and CREDITS
* files for more information.
*/
#include <stdio.h>
#include <sys/param.h>
#include <sys/file.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h>
#include "sbcl.h"
#include "./signal.h"
#include "os.h"
#include "arch.h"
#include "globals.h"
#include "interrupt.h"
#include "interr.h"
#include "lispregs.h"
#include "thread.h"
#include "runtime.h"
#include "genesis/static-symbols.h"
#include "genesis/fdefn.h"
#include <sys/types.h>
#include <signal.h>
/* #include <sys/sysinfo.h> */
#include "validate.h"
#if defined LISP_FEATURE_GENCGC
#include "gencgc-internal.h"
#endif
os_vm_size_t os_vm_page_size;
#ifdef __NetBSD__
#include <sys/resource.h>
#include <sys/sysctl.h>
#include <string.h>
#include <sys/stat.h> /* For the stat-family wrappers. */
#include <dirent.h> /* For the opendir()/readdir() wrappers */
#include <sys/socket.h> /* For the socket() wrapper */
static void netbsd_init();
#endif /* __NetBSD__ */
#ifdef __FreeBSD__
#include <sys/sysctl.h>
#if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
#include <sys/umtx.h>
#endif
static void freebsd_init();
#endif /* __FreeBSD__ */
void
os_init(char *argv[], char *envp[])
{
os_vm_page_size = getpagesize();
#ifdef __NetBSD__
netbsd_init();
#elif defined(__FreeBSD__)
freebsd_init();
#endif
}
sigset_t *
os_context_sigmask_addr(os_context_t *context)
{
/* (Unlike most of the other context fields that we access, the
* signal mask field is a field of the basic, outermost context
* struct itself both in FreeBSD 4.0 and in OpenBSD 2.6.) */
#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(LISP_FEATURE_DARWIN)
return &context->uc_sigmask;
#elif defined (__OpenBSD__)
return &context->sc_mask;
#else
#error unsupported BSD variant
#endif
}
os_vm_address_t
os_validate(os_vm_address_t addr, os_vm_size_t len)
{
int flags = MAP_PRIVATE | MAP_ANON;
if (addr)
flags |= MAP_FIXED;
addr = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
if (addr == MAP_FAILED) {
perror("mmap");
return NULL;
}
return addr;
}
void
os_invalidate(os_vm_address_t addr, os_vm_size_t len)
{
if (munmap(addr, len) == -1)
perror("munmap");
}
os_vm_address_t
os_map(int fd, int offset, os_vm_address_t addr, os_vm_size_t len)
{
addr = mmap(addr, len,
OS_VM_PROT_ALL,
MAP_PRIVATE | MAP_FILE | MAP_FIXED,
fd, (off_t) offset);
if (addr == MAP_FAILED) {
perror("mmap");
lose("unexpected mmap(..) failure\n");
}
return addr;
}
void
os_protect(os_vm_address_t address, os_vm_size_t length, os_vm_prot_t prot)
{
if (mprotect(address, length, prot) == -1) {
perror("mprotect");
}
}
static boolean
in_range_p(os_vm_address_t a, lispobj sbeg, size_t slen)
{
char* beg = (char*) sbeg;
char* end = (char*) sbeg + slen;
char* adr = (char*) a;
return (adr >= beg && adr < end);
}
boolean
is_valid_lisp_addr(os_vm_address_t addr)
{
struct thread *th;
if (in_range_p(addr, READ_ONLY_SPACE_START, READ_ONLY_SPACE_SIZE) ||
in_range_p(addr, STATIC_SPACE_START, STATIC_SPACE_SIZE) ||
in_range_p(addr, DYNAMIC_SPACE_START, dynamic_space_size))
return 1;
for_each_thread(th) {
if (((os_vm_address_t)th->control_stack_start <= addr) &&
(addr < (os_vm_address_t)th->control_stack_end))
return 1;
if (in_range_p(addr, (lispobj) th->binding_stack_start,
BINDING_STACK_SIZE))
return 1;
}
return 0;
}
/*
* any OS-dependent special low-level handling for signals
*/
#if defined LISP_FEATURE_GENCGC
/*
* The GENCGC needs to be hooked into whatever signal is raised for
* page fault on this OS.
*/
void
memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context
#if defined(LISP_FEATURE_FREEBSD) && defined(LISP_FEATURE_X86_64)
/* FreeBSD/amd64 stores fault address only in undocumented 4th arg. */
,void *fault_addr
#endif
)
{
os_context_t *context = arch_os_get_context(&void_context);
#if defined(LISP_FEATURE_FREEBSD) && defined(LISP_FEATURE_X86_64)
/* KLUDGE: Store fault address into si_addr for compatibilities. */
siginfo->si_addr = fault_addr;
#else
void *fault_addr = arch_get_bad_addr(signal, siginfo, context);
#endif
#if defined(LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_CONTEXT)
FSHOW_SIGNAL((stderr, "/ TLS: restoring fs: %p in memory_fault_handler\n",
*CONTEXT_ADDR_FROM_STEM(fs)));
os_restore_tls_segment_register(context);
#endif
FSHOW((stderr, "Memory fault at: %p, PC: %p\n", fault_addr, *os_context_pc_addr(context)));
if (!gencgc_handle_wp_violation(fault_addr))
if(!handle_guard_page_triggered(context,fault_addr)) {
#ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
lisp_memory_fault_error(context, fault_addr);
#else
if (!maybe_gc(context)) {
interrupt_handle_now(signal, siginfo, context);
}
#if defined(LISP_FEATURE_DARWIN)
/* Work around G5 bug; fix courtesy gbyers */
DARWIN_FIX_CONTEXT(context);
#endif
#endif
}
}
#if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
void
mach_error_memory_fault_handler(int signal, siginfo_t *siginfo, void *void_context) {
lose("Unhandled memory fault. Exiting.");
}
#endif
void
os_install_interrupt_handlers(void)
{
SHOW("os_install_interrupt_handlers()/bsd-os/defined(GENCGC)");
#if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
mach_error_memory_fault_handler);
#else
undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
#ifdef LISP_FEATURE_FREEBSD
(__siginfohandler_t *)
#endif
memory_fault_handler);
#endif
#ifdef LISP_FEATURE_SB_THREAD
undoably_install_low_level_interrupt_handler(SIG_INTERRUPT_THREAD,
interrupt_thread_handler);
undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_GC,
sig_stop_for_gc_handler);
#ifdef SIG_RESUME_FROM_GC
undoably_install_low_level_interrupt_handler(SIG_RESUME_FROM_GC,
sig_stop_for_gc_handler);
#endif
#endif
SHOW("leaving os_install_interrupt_handlers()");
}
#else /* Currently PPC/Darwin/Cheney only */
static void
sigsegv_handler(int signal, siginfo_t *info, void* void_context)
{
os_context_t *context = arch_os_get_context(&void_context);
#if 0
unsigned int pc = (unsigned int *)(*os_context_pc_addr(context));
#endif
os_vm_address_t addr;
addr = arch_get_bad_addr(signal, info, context);
if (!cheneygc_handle_wp_violation(context, addr))
if (!handle_guard_page_triggered(context, addr))
interrupt_handle_now(signal, info, context);
/* Work around G5 bug; fix courtesy gbyers */
DARWIN_FIX_CONTEXT(context);
}
void
os_install_interrupt_handlers(void)
{
SHOW("os_install_interrupt_handlers()/bsd-os/!defined(GENCGC)");
undoably_install_low_level_interrupt_handler(SIG_MEMORY_FAULT,
sigsegv_handler);
}
#endif /* defined GENCGC */
#ifdef __NetBSD__
static void netbsd_init()
{
struct rlimit rl;
int mib[2], osrev;
size_t len;
/* Are we running on a sufficiently functional kernel? */
mib[0] = CTL_KERN;
mib[1] = KERN_OSREV;
len = sizeof(osrev);
sysctl(mib, 2, &osrev, &len, NULL, 0);
/* If we're older than 2.0... */
if (osrev < 200000000) {
fprintf(stderr, "osrev = %d (needed at least 200000000).\n", osrev);
lose("NetBSD kernel too old to run sbcl.\n");
}
/* NetBSD counts mmap()ed space against the process's data size limit,
* so yank it up. This might be a nasty thing to do? */
getrlimit (RLIMIT_DATA, &rl);
/* Amazingly for such a new port, the provenance and meaning of
this number are unknown. It might just mean REALLY_BIG_LIMIT,
or possibly it should be calculated from dynamic space size.
-- CSR, 2004-04-08 */
rl.rlim_cur = 1073741824;
if (setrlimit (RLIMIT_DATA, &rl) < 0) {
fprintf (stderr,
"RUNTIME WARNING: unable to raise process data size limit:\n\
%s.\n\
The system may fail to start.\n",
strerror(errno));
}
}
/* Various routines in NetBSD's C library are compatibility wrappers
for old versions. Programs must be processed by the C toolchain in
order to get up-to-date definitions of such routines. */
/* The stat-family, opendir, and readdir are used only in sb-posix, as
of 2007-01-16. -- RMK */
int
_stat(const char *path, struct stat *sb)
{
return stat(path, sb);
}
int
_lstat(const char *path, struct stat *sb)
{
return lstat(path, sb);
}
int
_fstat(int fd, struct stat *sb)
{
return fstat(fd, sb);
}
DIR *
_opendir(const char *filename)
{
return opendir(filename);
}
struct dirent *
_readdir(DIR *dirp)
{
return readdir(dirp);
}
/* Used in sb-bsd-sockets. */
int
_socket(int domain, int type, int protocol)
{
return socket(domain, type, protocol);
}
#endif /* __NetBSD__ */
#ifdef __FreeBSD__
extern int getosreldate(void);
int sig_memory_fault;
static void freebsd_init()
{
/* Memory fault signal on FreeBSD was changed from SIGBUS to
* SIGSEGV. */
if (getosreldate() < 700004)
sig_memory_fault = SIGBUS;
else
sig_memory_fault = SIGSEGV;
/* Quote from sbcl-devel (NIIMI Satoshi): "Some OSes, like FreeBSD
* 4.x with GENERIC kernel, does not enable SSE support even on
* SSE capable CPUs". Detect this situation and skip the
* fast_bzero sse/base selection logic that's normally done in
* x86-assem.S.
*/
#ifdef LISP_FEATURE_X86
{
size_t len;
int instruction_sse;
len = sizeof(instruction_sse);
if (sysctlbyname("hw.instruction_sse", &instruction_sse, &len,
NULL, 0) == 0 && instruction_sse != 0) {
/* Use the SSE detector */
fast_bzero_pointer = fast_bzero_detect;
}
}
#endif /* LISP_FEATURE_X86 */
}
#if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
int
futex_wait(int *lock_word, long oldval, long sec, unsigned long usec)
{
struct timespec timeout;
int ret;
again:
if (sec < 0)
ret = umtx_wait((void *)lock_word, oldval, NULL);
else {
timeout.tv_sec = sec;
timeout.tv_nsec = usec * 1000;
ret = umtx_wait((void *)lock_word, oldval, &timeout);
}
switch (ret) {
case 0:
return 0;
case ETIMEDOUT:
return 1;
case EINTR:
/* spurious wakeup from interrupt */
goto again;
default:
/* EWOULDBLOCK and others, need to check the lock */
return -1;
}
}
int
futex_wake(int *lock_word, int n)
{
return umtx_wake((void *)lock_word, n);
}
#endif
#endif /* __FreeBSD__ */
#ifdef LISP_FEATURE_DARWIN
/* defined in ppc-darwin-os.c instead */
#elif defined(LISP_FEATURE_FREEBSD)
#ifndef KERN_PROC_PATHNAME
#define KERN_PROC_PATHNAME 12
#endif
char *
os_get_runtime_executable_path()
{
char path[PATH_MAX + 1];
if (getosreldate() >= 600024) {
/* KERN_PROC_PATHNAME is available */
size_t len = PATH_MAX + 1;
int mib[4];
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_PATHNAME;
mib[3] = -1;
if (sysctl(mib, 4, &path, &len, NULL, 0) != 0)
return NULL;
} else {
int size;
size = readlink("/proc/curproc/file", path, sizeof(path) - 1);
if (size < 0)
return NULL;
path[size] = '\0';
}
if (strcmp(path, "unknown") == 0)
return NULL;
return copied_string(path);
}
#elif defined(LISP_FEATURE_NETBSD)
char *
os_get_runtime_executable_path()
{
struct stat sb;
char *path = strdup("/proc/curproc/file");
if (path && ((stat(path, &sb)) == 0))
return path;
else {
fprintf(stderr, "Couldn't stat /proc/curproc/file; is /proc mounted?\n");
return NULL;
}
}
#else /* Not DARWIN or FREEBSD or NETBSD */
char *
os_get_runtime_executable_path()
{
return NULL;
}
#endif