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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 <utime.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
#if defined(LISP_FEATURE_SB_WTIMER) && !defined(LISP_FEATURE_DARWIN)
# include <sys/event.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();
static os_vm_size_t max_allocation_size;
#endif /* __NetBSD__ */
#if defined LISP_FEATURE_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__ */
#ifdef __DragonFly__
#include <sys/sysctl.h>
static void dragonfly_init();
#endif /* __DragonFly__ */
#ifdef __OpenBSD__
#include <sys/types.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <dlfcn.h>
#ifdef LISP_FEATURE_X86
#include <machine/cpu.h>
#endif
static void openbsd_init();
#endif
void
os_init(char *argv[], char *envp[])
{
os_vm_page_size = BACKEND_PAGE_BYTES;
#ifdef __NetBSD__
netbsd_init();
#elif defined(LISP_FEATURE_FREEBSD)
freebsd_init();
#elif defined(__OpenBSD__)
openbsd_init();
#elif defined(LISP_FEATURE_DARWIN)
darwin_init();
#elif defined(__DragonFly__)
dragonfly_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(LISP_FEATURE_FREEBSD) || defined(__NetBSD__) || defined(LISP_FEATURE_DARWIN) \
|| defined(__DragonFly__)
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;
#ifdef __NetBSD__
if (addr) {
os_vm_address_t curaddr = addr;
while (len > 0) {
os_vm_address_t resaddr;
os_vm_size_t curlen = MIN(max_allocation_size, len);
resaddr = mmap(curaddr, curlen, OS_VM_PROT_ALL, flags, -1, 0);
if (resaddr == (os_vm_address_t) - 1) {
perror("mmap");
while (curaddr > addr) {
curaddr -= max_allocation_size;
munmap(curaddr, max_allocation_size);
}
return NULL;
}
curaddr += curlen;
len -= curlen;
}
} else {
#endif
addr = mmap(addr, len, OS_VM_PROT_ALL, flags, -1, 0);
#ifdef __NetBSD__
}
#endif
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, os_context_t *context)
{
void *fault_addr = arch_get_bad_addr(signal, siginfo, context);
#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)));
#ifdef LISP_FEATURE_SB_SAFEPOINT
if (!handle_safepoint_violation(context, fault_addr))
#endif
if (!gencgc_handle_wp_violation(fault_addr))
if(!handle_guard_page_triggered(context,fault_addr))
lisp_memory_fault_error(context, fault_addr);
}
#if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
void
mach_error_memory_fault_handler(int signal, siginfo_t *siginfo,
os_context_t *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,
#if defined(LISP_FEATURE_FREEBSD) && !defined(__GLIBC__)
(__siginfohandler_t *)
#endif
memory_fault_handler);
#endif
#ifdef LISP_FEATURE_SB_THREAD
# ifdef LISP_FEATURE_SB_SAFEPOINT
# ifdef LISP_FEATURE_SB_THRUPTION
undoably_install_low_level_interrupt_handler(SIGPIPE, thruption_handler);
# endif
# else
undoably_install_low_level_interrupt_handler(SIG_STOP_FOR_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, os_context_t *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);
}
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);
if (rl.rlim_cur < rl.rlim_max) {
rl.rlim_cur = rl.rlim_max;
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));
}
}
max_allocation_size = (os_vm_size_t)((rl.rlim_cur / 2) &
~(32 * 1024 * 1024));
#ifdef LISP_FEATURE_X86
{
size_t len;
int sse;
len = sizeof(sse);
if (sysctlbyname("machdep.sse", &sse, &len,
NULL, 0) == 0 && sse != 0) {
/* Use the SSE detector */
fast_bzero_pointer = fast_bzero_detect;
}
}
#endif /* LISP_FEATURE_X86 */
}
/* 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);
}
int
_utime(const char *file, const struct utimbuf *timep)
{
return utime(file, timep);
}
/* Used in sb-bsd-sockets. */
int
_socket(int domain, int type, int protocol)
{
return socket(domain, type, protocol);
}
#endif /* __NetBSD__ */
#if defined(LISP_FEATURE_FREEBSD)
#ifndef __GLIBC__
extern int getosreldate(void);
#endif
int sig_memory_fault;
static void freebsd_init()
{
/* Memory fault signal on FreeBSD was changed from SIGBUS to
* SIGSEGV. */
#ifdef __GLIBC__
sig_memory_fault = SIGSEGV;
#else
if (getosreldate() < 700004)
sig_memory_fault = SIGBUS;
else
sig_memory_fault = SIGSEGV;
#endif
/* 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_FUTEX) \
&& !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
int
futex_wait(int *lock_word, long oldval, long sec, unsigned long usec)
{
struct timespec timeout;
int ret;
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:
return 2;
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 __DragonFly__
static void dragonfly_init()
{
#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_FUTEX) \
&& !defined(LISP_FEATURE_SB_PTHREAD_FUTEX)
int
futex_wait(int *lock_word, long oldval, long sec, unsigned long usec)
{
int ret;
if (sec < 0)
ret = umtx_sleep(lock_word, oldval, 0);
else {
int count = usec + 1000000 * sec;
ret = umtx_sleep(lock_word, oldval, count);
}
if (ret == 0) return 0;
else {
switch (errno) {
case EWOULDBLOCK: // Operation timed out
return 1;
case EINTR:
return 2;
default: // Such as EINVAL or EBUSY
return -1;
}
}
}
int
futex_wake(int *lock_word, int n)
{
return umtx_wakeup(lock_word, n);
}
#endif
#endif /* __DragonFly__ */
#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(int external)
{
char path[PATH_MAX + 1];
#ifndef __GLIBC__
if (getosreldate() >= 600024) {
#endif
/* 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;
#ifndef __GLIBC__
} else {
int size;
size = readlink("/proc/curproc/file", path, sizeof(path) - 1);
if (size < 0)
return NULL;
path[size] = '\0';
}
#endif
if (strcmp(path, "unknown") == 0)
return NULL;
return copied_string(path);
}
#elif defined(LISP_FEATURE_DRAGONFLY)
char *
os_get_runtime_executable_path(int external)
{
char path[PATH_MAX + 1];
int 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) || defined(LISP_FEATURE_OPENBSD)
char *
os_get_runtime_executable_path(int external)
{
struct stat sb;
if (!external && stat("/proc/curproc/file", &sb) == 0)
return copied_string("/proc/curproc/file");
return NULL;
}
#else /* Not DARWIN or FREEBSD or NETBSD or OPENBSD or DragonFly */
char *
os_get_runtime_executable_path(int external)
{
return NULL;
}
#endif
#ifdef __OpenBSD__
int openbsd_use_fxsave = 0;
void
openbsd_init()
{
#ifdef LISP_FEATURE_X86
int mib[2];
size_t size;
#endif
/*
* Show a warning if it looks like the memory available after
* allocating the spaces won't be at least this much.
*/
#ifdef LISP_FEATURE_X86_64
const int wantfree = 64 * 1024 * 1024;
#else
const int wantfree = 32 * 1024 * 1024;
#endif
struct rlimit rl;
#ifdef LISP_FEATURE_X86
/* Save the machdep.osfxsr sysctl for use by os_restore_fp_control() */
mib[0] = CTL_MACHDEP;
mib[1] = CPU_OSFXSR;
size = sizeof (openbsd_use_fxsave);
sysctl(mib, 2, &openbsd_use_fxsave, &size, NULL, 0);
#endif
/* OpenBSD, like NetBSD, counts mmap()ed space against the
* process's data size limit. If the soft limit is lower than the
* hard limit then try to yank it up, this lets users in the
* "staff" or "daemon" login classes run sbcl with larger dynamic
* space sizes.
*/
getrlimit (RLIMIT_DATA, &rl);
if (rl.rlim_cur < rl.rlim_max) {
rl.rlim_cur = rl.rlim_max;
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));
}
}
/*
* Display a (hopefully) helpful warning if it looks like we won't
* be able to allocate enough memory.
*/
getrlimit (RLIMIT_DATA, &rl);
if (dynamic_space_size + READ_ONLY_SPACE_SIZE + STATIC_SPACE_SIZE +
LINKAGE_TABLE_SPACE_SIZE + wantfree > rl.rlim_cur)
fprintf (stderr,
"RUNTIME WARNING: data size resource limit may be too low,\n"
" try decreasing the dynamic space size with --dynamic-space-size\n"
" or raising the datasize or datasize-max limits in /etc/login.conf\n");
}
/* OpenBSD's dlsym() relies on the gcc bulitin
* __builtin_return_address(0) returning an address in the
* executable's text segment, but when called from lisp it will return
* an address in the dynamic space. Work around this by calling this
* wrapper function instead. Note that tail-call optimization will
* defeat this, disable it by saving the dlsym() return value in a
* volatile variable.
*/
void *
os_dlsym(void *handle, const char *symbol)
{
void * volatile ret = dlsym(handle, symbol);
return ret;
}
#endif
#if defined(LISP_FEATURE_SB_WTIMER) && !defined(LISP_FEATURE_DARWIN)
/*
* Waitable timer implementation for the safepoint-based (SIGALRM-free)
* timer facility using kqueue.
*/
int
os_create_wtimer()
{
int kq = kqueue();
if (kq == -1)
lose("os_create_wtimer: kqueue");
return kq;
}
int
os_wait_for_wtimer(int kq)
{
struct kevent ev;
int n;
if ( (n = kevent(kq, 0, 0, &ev, 1, 0)) == -1) {
if (errno != EINTR)
lose("os_wtimer_listen failed");
n = 0;
}
return n != 1;
}
void
os_close_wtimer(int kq)
{
if (close(kq) == -1)
lose("os_close_wtimer failed");
}
void
os_set_wtimer(int kq, int sec, int nsec)
{
long long msec
= ((long long) sec) * 1000 + (long long) (nsec+999999) / 1000000;
if (msec > INT_MAX) msec = INT_MAX;
struct kevent ev;
EV_SET(&ev, 1, EVFILT_TIMER, EV_ADD|EV_ENABLE|EV_ONESHOT, 0, (int)msec, 0);
if (kevent(kq, &ev, 1, 0, 0, 0) == -1)
perror("os_set_wtimer: kevent");
}
void
os_cancel_wtimer(int kq)
{
struct kevent ev;
EV_SET(&ev, 1, EVFILT_TIMER, EV_DISABLE, 0, 0, 0);
if (kevent(kq, &ev, 1, 0, 0, 0) == -1 && errno != ENOENT)
perror("os_cancel_wtimer: kevent");
}
#endif