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syscall.c
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/*
* Linux syscalls
*
* Copyright (c) 2003 Fabrice Bellard
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#define _ATFILE_SOURCE
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "qemu/path.h"
#include <elf.h>
#include <endian.h>
#include <grp.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#include <sys/wait.h>
#include <sys/mount.h>
#include <sys/file.h>
#include <sys/fsuid.h>
#include <sys/personality.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/swap.h>
#include <linux/capability.h>
#include <sched.h>
#include <sys/timex.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/uio.h>
#include <poll.h>
#include <sys/times.h>
#include <sys/shm.h>
#include <sys/sem.h>
#include <sys/statfs.h>
#include <utime.h>
#include <sys/sysinfo.h>
#include <sys/signalfd.h>
//#include <sys/user.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <linux/wireless.h>
#include <linux/icmp.h>
#include <linux/icmpv6.h>
#include <linux/errqueue.h>
#include <linux/random.h>
#include "qemu-common.h"
#ifdef CONFIG_TIMERFD
#include <sys/timerfd.h>
#endif
#ifdef TARGET_GPROF
#include <sys/gmon.h>
#endif
#ifdef CONFIG_EVENTFD
#include <sys/eventfd.h>
#endif
#ifdef CONFIG_EPOLL
#include <sys/epoll.h>
#endif
#ifdef CONFIG_ATTR
#include "qemu/xattr.h"
#endif
#ifdef CONFIG_SENDFILE
#include <sys/sendfile.h>
#endif
#define termios host_termios
#define winsize host_winsize
#define termio host_termio
#define sgttyb host_sgttyb /* same as target */
#define tchars host_tchars /* same as target */
#define ltchars host_ltchars /* same as target */
#include <linux/termios.h>
#include <linux/unistd.h>
#include <linux/cdrom.h>
#include <linux/hdreg.h>
#include <linux/soundcard.h>
#include <linux/kd.h>
#include <linux/mtio.h>
#include <linux/fs.h>
#if defined(CONFIG_FIEMAP)
#include <linux/fiemap.h>
#endif
#include <linux/fb.h>
#if defined(CONFIG_USBFS)
#include <linux/usbdevice_fs.h>
#include <linux/usb/ch9.h>
#endif
#include <linux/vt.h>
#include <linux/dm-ioctl.h>
#include <linux/reboot.h>
#include <linux/route.h>
#include <linux/filter.h>
#include <linux/blkpg.h>
#include <netpacket/packet.h>
#include <linux/netlink.h>
#include "linux_loop.h"
#include "uname.h"
#include "qemu.h"
#include "fd-trans.h"
#ifndef CLONE_IO
#define CLONE_IO 0x80000000 /* Clone io context */
#endif
/* We can't directly call the host clone syscall, because this will
* badly confuse libc (breaking mutexes, for example). So we must
* divide clone flags into:
* * flag combinations that look like pthread_create()
* * flag combinations that look like fork()
* * flags we can implement within QEMU itself
* * flags we can't support and will return an error for
*/
/* For thread creation, all these flags must be present; for
* fork, none must be present.
*/
#define CLONE_THREAD_FLAGS \
(CLONE_VM | CLONE_FS | CLONE_FILES | \
CLONE_SIGHAND | CLONE_THREAD | CLONE_SYSVSEM)
/* These flags are ignored:
* CLONE_DETACHED is now ignored by the kernel;
* CLONE_IO is just an optimisation hint to the I/O scheduler
*/
#define CLONE_IGNORED_FLAGS \
(CLONE_DETACHED | CLONE_IO)
/* Flags for fork which we can implement within QEMU itself */
#define CLONE_OPTIONAL_FORK_FLAGS \
(CLONE_SETTLS | CLONE_PARENT_SETTID | \
CLONE_CHILD_CLEARTID | CLONE_CHILD_SETTID)
/* Flags for thread creation which we can implement within QEMU itself */
#define CLONE_OPTIONAL_THREAD_FLAGS \
(CLONE_SETTLS | CLONE_PARENT_SETTID | \
CLONE_CHILD_CLEARTID | CLONE_CHILD_SETTID | CLONE_PARENT)
#define CLONE_INVALID_FORK_FLAGS \
(~(CSIGNAL | CLONE_OPTIONAL_FORK_FLAGS | CLONE_IGNORED_FLAGS))
#define CLONE_INVALID_THREAD_FLAGS \
(~(CSIGNAL | CLONE_THREAD_FLAGS | CLONE_OPTIONAL_THREAD_FLAGS | \
CLONE_IGNORED_FLAGS))
/* CLONE_VFORK is special cased early in do_fork(). The other flag bits
* have almost all been allocated. We cannot support any of
* CLONE_NEWNS, CLONE_NEWCGROUP, CLONE_NEWUTS, CLONE_NEWIPC,
* CLONE_NEWUSER, CLONE_NEWPID, CLONE_NEWNET, CLONE_PTRACE, CLONE_UNTRACED.
* The checks against the invalid thread masks above will catch these.
* (The one remaining unallocated bit is 0x1000 which used to be CLONE_PID.)
*/
/* Define DEBUG_ERESTARTSYS to force every syscall to be restarted
* once. This exercises the codepaths for restart.
*/
//#define DEBUG_ERESTARTSYS
//#include <linux/msdos_fs.h>
#define VFAT_IOCTL_READDIR_BOTH _IOR('r', 1, struct linux_dirent [2])
#define VFAT_IOCTL_READDIR_SHORT _IOR('r', 2, struct linux_dirent [2])
#undef _syscall0
#undef _syscall1
#undef _syscall2
#undef _syscall3
#undef _syscall4
#undef _syscall5
#undef _syscall6
#define _syscall0(type,name) \
static type name (void) \
{ \
return syscall(__NR_##name); \
}
#define _syscall1(type,name,type1,arg1) \
static type name (type1 arg1) \
{ \
return syscall(__NR_##name, arg1); \
}
#define _syscall2(type,name,type1,arg1,type2,arg2) \
static type name (type1 arg1,type2 arg2) \
{ \
return syscall(__NR_##name, arg1, arg2); \
}
#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \
static type name (type1 arg1,type2 arg2,type3 arg3) \
{ \
return syscall(__NR_##name, arg1, arg2, arg3); \
}
#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4) \
{ \
return syscall(__NR_##name, arg1, arg2, arg3, arg4); \
}
#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5) \
static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5) \
{ \
return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5); \
}
#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5,type6,arg6) \
static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5, \
type6 arg6) \
{ \
return syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5, arg6); \
}
#define __NR_sys_uname __NR_uname
#define __NR_sys_getcwd1 __NR_getcwd
#define __NR_sys_getdents __NR_getdents
#define __NR_sys_getdents64 __NR_getdents64
#define __NR_sys_getpriority __NR_getpriority
#define __NR_sys_rt_sigqueueinfo __NR_rt_sigqueueinfo
#define __NR_sys_rt_tgsigqueueinfo __NR_rt_tgsigqueueinfo
#define __NR_sys_syslog __NR_syslog
#define __NR_sys_futex __NR_futex
#define __NR_sys_inotify_init __NR_inotify_init
#define __NR_sys_inotify_add_watch __NR_inotify_add_watch
#define __NR_sys_inotify_rm_watch __NR_inotify_rm_watch
#if defined(__alpha__) || defined(__x86_64__) || defined(__s390x__)
#define __NR__llseek __NR_lseek
#endif
/* Newer kernel ports have llseek() instead of _llseek() */
#if defined(TARGET_NR_llseek) && !defined(TARGET_NR__llseek)
#define TARGET_NR__llseek TARGET_NR_llseek
#endif
#ifdef __NR_gettid
_syscall0(int, gettid)
#else
/* This is a replacement for the host gettid() and must return a host
errno. */
static int gettid(void) {
return -ENOSYS;
}
#endif
/* For the 64-bit guest on 32-bit host case we must emulate
* getdents using getdents64, because otherwise the host
* might hand us back more dirent records than we can fit
* into the guest buffer after structure format conversion.
* Otherwise we emulate getdents with getdents if the host has it.
*/
#if defined(__NR_getdents) && HOST_LONG_BITS >= TARGET_ABI_BITS
#define EMULATE_GETDENTS_WITH_GETDENTS
#endif
#if defined(TARGET_NR_getdents) && defined(EMULATE_GETDENTS_WITH_GETDENTS)
_syscall3(int, sys_getdents, uint, fd, struct linux_dirent *, dirp, uint, count);
#endif
#if (defined(TARGET_NR_getdents) && \
!defined(EMULATE_GETDENTS_WITH_GETDENTS)) || \
(defined(TARGET_NR_getdents64) && defined(__NR_getdents64))
_syscall3(int, sys_getdents64, uint, fd, struct linux_dirent64 *, dirp, uint, count);
#endif
#if defined(TARGET_NR__llseek) && defined(__NR_llseek)
_syscall5(int, _llseek, uint, fd, ulong, hi, ulong, lo,
loff_t *, res, uint, wh);
#endif
_syscall3(int, sys_rt_sigqueueinfo, pid_t, pid, int, sig, siginfo_t *, uinfo)
_syscall4(int, sys_rt_tgsigqueueinfo, pid_t, pid, pid_t, tid, int, sig,
siginfo_t *, uinfo)
_syscall3(int,sys_syslog,int,type,char*,bufp,int,len)
#ifdef __NR_exit_group
_syscall1(int,exit_group,int,error_code)
#endif
#if defined(TARGET_NR_set_tid_address) && defined(__NR_set_tid_address)
_syscall1(int,set_tid_address,int *,tidptr)
#endif
#if defined(TARGET_NR_futex) && defined(__NR_futex)
_syscall6(int,sys_futex,int *,uaddr,int,op,int,val,
const struct timespec *,timeout,int *,uaddr2,int,val3)
#endif
#define __NR_sys_sched_getaffinity __NR_sched_getaffinity
_syscall3(int, sys_sched_getaffinity, pid_t, pid, unsigned int, len,
unsigned long *, user_mask_ptr);
#define __NR_sys_sched_setaffinity __NR_sched_setaffinity
_syscall3(int, sys_sched_setaffinity, pid_t, pid, unsigned int, len,
unsigned long *, user_mask_ptr);
#define __NR_sys_getcpu __NR_getcpu
_syscall3(int, sys_getcpu, unsigned *, cpu, unsigned *, node, void *, tcache);
_syscall4(int, reboot, int, magic1, int, magic2, unsigned int, cmd,
void *, arg);
_syscall2(int, capget, struct __user_cap_header_struct *, header,
struct __user_cap_data_struct *, data);
_syscall2(int, capset, struct __user_cap_header_struct *, header,
struct __user_cap_data_struct *, data);
#if defined(TARGET_NR_ioprio_get) && defined(__NR_ioprio_get)
_syscall2(int, ioprio_get, int, which, int, who)
#endif
#if defined(TARGET_NR_ioprio_set) && defined(__NR_ioprio_set)
_syscall3(int, ioprio_set, int, which, int, who, int, ioprio)
#endif
#if defined(TARGET_NR_getrandom) && defined(__NR_getrandom)
_syscall3(int, getrandom, void *, buf, size_t, buflen, unsigned int, flags)
#endif
#if defined(TARGET_NR_kcmp) && defined(__NR_kcmp)
_syscall5(int, kcmp, pid_t, pid1, pid_t, pid2, int, type,
unsigned long, idx1, unsigned long, idx2)
#endif
static bitmask_transtbl fcntl_flags_tbl[] = {
{ TARGET_O_ACCMODE, TARGET_O_WRONLY, O_ACCMODE, O_WRONLY, },
{ TARGET_O_ACCMODE, TARGET_O_RDWR, O_ACCMODE, O_RDWR, },
{ TARGET_O_CREAT, TARGET_O_CREAT, O_CREAT, O_CREAT, },
{ TARGET_O_EXCL, TARGET_O_EXCL, O_EXCL, O_EXCL, },
{ TARGET_O_NOCTTY, TARGET_O_NOCTTY, O_NOCTTY, O_NOCTTY, },
{ TARGET_O_TRUNC, TARGET_O_TRUNC, O_TRUNC, O_TRUNC, },
{ TARGET_O_APPEND, TARGET_O_APPEND, O_APPEND, O_APPEND, },
{ TARGET_O_NONBLOCK, TARGET_O_NONBLOCK, O_NONBLOCK, O_NONBLOCK, },
{ TARGET_O_SYNC, TARGET_O_DSYNC, O_SYNC, O_DSYNC, },
{ TARGET_O_SYNC, TARGET_O_SYNC, O_SYNC, O_SYNC, },
{ TARGET_FASYNC, TARGET_FASYNC, FASYNC, FASYNC, },
{ TARGET_O_DIRECTORY, TARGET_O_DIRECTORY, O_DIRECTORY, O_DIRECTORY, },
{ TARGET_O_NOFOLLOW, TARGET_O_NOFOLLOW, O_NOFOLLOW, O_NOFOLLOW, },
#if defined(O_DIRECT)
{ TARGET_O_DIRECT, TARGET_O_DIRECT, O_DIRECT, O_DIRECT, },
#endif
#if defined(O_NOATIME)
{ TARGET_O_NOATIME, TARGET_O_NOATIME, O_NOATIME, O_NOATIME },
#endif
#if defined(O_CLOEXEC)
{ TARGET_O_CLOEXEC, TARGET_O_CLOEXEC, O_CLOEXEC, O_CLOEXEC },
#endif
#if defined(O_PATH)
{ TARGET_O_PATH, TARGET_O_PATH, O_PATH, O_PATH },
#endif
#if defined(O_TMPFILE)
{ TARGET_O_TMPFILE, TARGET_O_TMPFILE, O_TMPFILE, O_TMPFILE },
#endif
/* Don't terminate the list prematurely on 64-bit host+guest. */
#if TARGET_O_LARGEFILE != 0 || O_LARGEFILE != 0
{ TARGET_O_LARGEFILE, TARGET_O_LARGEFILE, O_LARGEFILE, O_LARGEFILE, },
#endif
{ 0, 0, 0, 0 }
};
static int sys_getcwd1(char *buf, size_t size)
{
if (getcwd(buf, size) == NULL) {
/* getcwd() sets errno */
return (-1);
}
return strlen(buf)+1;
}
#ifdef TARGET_NR_utimensat
#if defined(__NR_utimensat)
#define __NR_sys_utimensat __NR_utimensat
_syscall4(int,sys_utimensat,int,dirfd,const char *,pathname,
const struct timespec *,tsp,int,flags)
#else
static int sys_utimensat(int dirfd, const char *pathname,
const struct timespec times[2], int flags)
{
errno = ENOSYS;
return -1;
}
#endif
#endif /* TARGET_NR_utimensat */
#ifdef TARGET_NR_renameat2
#if defined(__NR_renameat2)
#define __NR_sys_renameat2 __NR_renameat2
_syscall5(int, sys_renameat2, int, oldfd, const char *, old, int, newfd,
const char *, new, unsigned int, flags)
#else
static int sys_renameat2(int oldfd, const char *old,
int newfd, const char *new, int flags)
{
if (flags == 0) {
return renameat(oldfd, old, newfd, new);
}
errno = ENOSYS;
return -1;
}
#endif
#endif /* TARGET_NR_renameat2 */
#ifdef CONFIG_INOTIFY
#include <sys/inotify.h>
#if defined(TARGET_NR_inotify_init) && defined(__NR_inotify_init)
static int sys_inotify_init(void)
{
return (inotify_init());
}
#endif
#if defined(TARGET_NR_inotify_add_watch) && defined(__NR_inotify_add_watch)
static int sys_inotify_add_watch(int fd,const char *pathname, int32_t mask)
{
return (inotify_add_watch(fd, pathname, mask));
}
#endif
#if defined(TARGET_NR_inotify_rm_watch) && defined(__NR_inotify_rm_watch)
static int sys_inotify_rm_watch(int fd, int32_t wd)
{
return (inotify_rm_watch(fd, wd));
}
#endif
#ifdef CONFIG_INOTIFY1
#if defined(TARGET_NR_inotify_init1) && defined(__NR_inotify_init1)
static int sys_inotify_init1(int flags)
{
return (inotify_init1(flags));
}
#endif
#endif
#else
/* Userspace can usually survive runtime without inotify */
#undef TARGET_NR_inotify_init
#undef TARGET_NR_inotify_init1
#undef TARGET_NR_inotify_add_watch
#undef TARGET_NR_inotify_rm_watch
#endif /* CONFIG_INOTIFY */
#if defined(TARGET_NR_prlimit64)
#ifndef __NR_prlimit64
# define __NR_prlimit64 -1
#endif
#define __NR_sys_prlimit64 __NR_prlimit64
/* The glibc rlimit structure may not be that used by the underlying syscall */
struct host_rlimit64 {
uint64_t rlim_cur;
uint64_t rlim_max;
};
_syscall4(int, sys_prlimit64, pid_t, pid, int, resource,
const struct host_rlimit64 *, new_limit,
struct host_rlimit64 *, old_limit)
#endif
#if defined(TARGET_NR_timer_create)
/* Maxiumum of 32 active POSIX timers allowed at any one time. */
static timer_t g_posix_timers[32] = { 0, } ;
static inline int next_free_host_timer(void)
{
int k ;
/* FIXME: Does finding the next free slot require a lock? */
for (k = 0; k < ARRAY_SIZE(g_posix_timers); k++) {
if (g_posix_timers[k] == 0) {
g_posix_timers[k] = (timer_t) 1;
return k;
}
}
return -1;
}
#endif
/* ARM EABI and MIPS expect 64bit types aligned even on pairs or registers */
#ifdef TARGET_ARM
static inline int regpairs_aligned(void *cpu_env, int num)
{
return ((((CPUARMState *)cpu_env)->eabi) == 1) ;
}
#elif defined(TARGET_MIPS) && (TARGET_ABI_BITS == 32)
static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
#elif defined(TARGET_PPC) && !defined(TARGET_PPC64)
/* SysV AVI for PPC32 expects 64bit parameters to be passed on odd/even pairs
* of registers which translates to the same as ARM/MIPS, because we start with
* r3 as arg1 */
static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
#elif defined(TARGET_SH4)
/* SH4 doesn't align register pairs, except for p{read,write}64 */
static inline int regpairs_aligned(void *cpu_env, int num)
{
switch (num) {
case TARGET_NR_pread64:
case TARGET_NR_pwrite64:
return 1;
default:
return 0;
}
}
#elif defined(TARGET_XTENSA)
static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
#else
static inline int regpairs_aligned(void *cpu_env, int num) { return 0; }
#endif
#define ERRNO_TABLE_SIZE 1200
/* target_to_host_errno_table[] is initialized from
* host_to_target_errno_table[] in syscall_init(). */
static uint16_t target_to_host_errno_table[ERRNO_TABLE_SIZE] = {
};
/*
* This list is the union of errno values overridden in asm-<arch>/errno.h
* minus the errnos that are not actually generic to all archs.
*/
static uint16_t host_to_target_errno_table[ERRNO_TABLE_SIZE] = {
[EAGAIN] = TARGET_EAGAIN,
[EIDRM] = TARGET_EIDRM,
[ECHRNG] = TARGET_ECHRNG,
[EL2NSYNC] = TARGET_EL2NSYNC,
[EL3HLT] = TARGET_EL3HLT,
[EL3RST] = TARGET_EL3RST,
[ELNRNG] = TARGET_ELNRNG,
[EUNATCH] = TARGET_EUNATCH,
[ENOCSI] = TARGET_ENOCSI,
[EL2HLT] = TARGET_EL2HLT,
[EDEADLK] = TARGET_EDEADLK,
[ENOLCK] = TARGET_ENOLCK,
[EBADE] = TARGET_EBADE,
[EBADR] = TARGET_EBADR,
[EXFULL] = TARGET_EXFULL,
[ENOANO] = TARGET_ENOANO,
[EBADRQC] = TARGET_EBADRQC,
[EBADSLT] = TARGET_EBADSLT,
[EBFONT] = TARGET_EBFONT,
[ENOSTR] = TARGET_ENOSTR,
[ENODATA] = TARGET_ENODATA,
[ETIME] = TARGET_ETIME,
[ENOSR] = TARGET_ENOSR,
[ENONET] = TARGET_ENONET,
[ENOPKG] = TARGET_ENOPKG,
[EREMOTE] = TARGET_EREMOTE,
[ENOLINK] = TARGET_ENOLINK,
[EADV] = TARGET_EADV,
[ESRMNT] = TARGET_ESRMNT,
[ECOMM] = TARGET_ECOMM,
[EPROTO] = TARGET_EPROTO,
[EDOTDOT] = TARGET_EDOTDOT,
[EMULTIHOP] = TARGET_EMULTIHOP,
[EBADMSG] = TARGET_EBADMSG,
[ENAMETOOLONG] = TARGET_ENAMETOOLONG,
[EOVERFLOW] = TARGET_EOVERFLOW,
[ENOTUNIQ] = TARGET_ENOTUNIQ,
[EBADFD] = TARGET_EBADFD,
[EREMCHG] = TARGET_EREMCHG,
[ELIBACC] = TARGET_ELIBACC,
[ELIBBAD] = TARGET_ELIBBAD,
[ELIBSCN] = TARGET_ELIBSCN,
[ELIBMAX] = TARGET_ELIBMAX,
[ELIBEXEC] = TARGET_ELIBEXEC,
[EILSEQ] = TARGET_EILSEQ,
[ENOSYS] = TARGET_ENOSYS,
[ELOOP] = TARGET_ELOOP,
[ERESTART] = TARGET_ERESTART,
[ESTRPIPE] = TARGET_ESTRPIPE,
[ENOTEMPTY] = TARGET_ENOTEMPTY,
[EUSERS] = TARGET_EUSERS,
[ENOTSOCK] = TARGET_ENOTSOCK,
[EDESTADDRREQ] = TARGET_EDESTADDRREQ,
[EMSGSIZE] = TARGET_EMSGSIZE,
[EPROTOTYPE] = TARGET_EPROTOTYPE,
[ENOPROTOOPT] = TARGET_ENOPROTOOPT,
[EPROTONOSUPPORT] = TARGET_EPROTONOSUPPORT,
[ESOCKTNOSUPPORT] = TARGET_ESOCKTNOSUPPORT,
[EOPNOTSUPP] = TARGET_EOPNOTSUPP,
[EPFNOSUPPORT] = TARGET_EPFNOSUPPORT,
[EAFNOSUPPORT] = TARGET_EAFNOSUPPORT,
[EADDRINUSE] = TARGET_EADDRINUSE,
[EADDRNOTAVAIL] = TARGET_EADDRNOTAVAIL,
[ENETDOWN] = TARGET_ENETDOWN,
[ENETUNREACH] = TARGET_ENETUNREACH,
[ENETRESET] = TARGET_ENETRESET,
[ECONNABORTED] = TARGET_ECONNABORTED,
[ECONNRESET] = TARGET_ECONNRESET,
[ENOBUFS] = TARGET_ENOBUFS,
[EISCONN] = TARGET_EISCONN,
[ENOTCONN] = TARGET_ENOTCONN,
[EUCLEAN] = TARGET_EUCLEAN,
[ENOTNAM] = TARGET_ENOTNAM,
[ENAVAIL] = TARGET_ENAVAIL,
[EISNAM] = TARGET_EISNAM,
[EREMOTEIO] = TARGET_EREMOTEIO,
[EDQUOT] = TARGET_EDQUOT,
[ESHUTDOWN] = TARGET_ESHUTDOWN,
[ETOOMANYREFS] = TARGET_ETOOMANYREFS,
[ETIMEDOUT] = TARGET_ETIMEDOUT,
[ECONNREFUSED] = TARGET_ECONNREFUSED,
[EHOSTDOWN] = TARGET_EHOSTDOWN,
[EHOSTUNREACH] = TARGET_EHOSTUNREACH,
[EALREADY] = TARGET_EALREADY,
[EINPROGRESS] = TARGET_EINPROGRESS,
[ESTALE] = TARGET_ESTALE,
[ECANCELED] = TARGET_ECANCELED,
[ENOMEDIUM] = TARGET_ENOMEDIUM,
[EMEDIUMTYPE] = TARGET_EMEDIUMTYPE,
#ifdef ENOKEY
[ENOKEY] = TARGET_ENOKEY,
#endif
#ifdef EKEYEXPIRED
[EKEYEXPIRED] = TARGET_EKEYEXPIRED,
#endif
#ifdef EKEYREVOKED
[EKEYREVOKED] = TARGET_EKEYREVOKED,
#endif
#ifdef EKEYREJECTED
[EKEYREJECTED] = TARGET_EKEYREJECTED,
#endif
#ifdef EOWNERDEAD
[EOWNERDEAD] = TARGET_EOWNERDEAD,
#endif
#ifdef ENOTRECOVERABLE
[ENOTRECOVERABLE] = TARGET_ENOTRECOVERABLE,
#endif
#ifdef ENOMSG
[ENOMSG] = TARGET_ENOMSG,
#endif
#ifdef ERKFILL
[ERFKILL] = TARGET_ERFKILL,
#endif
#ifdef EHWPOISON
[EHWPOISON] = TARGET_EHWPOISON,
#endif
};
static inline int host_to_target_errno(int err)
{
if (err >= 0 && err < ERRNO_TABLE_SIZE &&
host_to_target_errno_table[err]) {
return host_to_target_errno_table[err];
}
return err;
}
static inline int target_to_host_errno(int err)
{
if (err >= 0 && err < ERRNO_TABLE_SIZE &&
target_to_host_errno_table[err]) {
return target_to_host_errno_table[err];
}
return err;
}
static inline abi_long get_errno(abi_long ret)
{
if (ret == -1)
return -host_to_target_errno(errno);
else
return ret;
}
const char *target_strerror(int err)
{
if (err == TARGET_ERESTARTSYS) {
return "To be restarted";
}
if (err == TARGET_QEMU_ESIGRETURN) {
return "Successful exit from sigreturn";
}
if ((err >= ERRNO_TABLE_SIZE) || (err < 0)) {
return NULL;
}
return strerror(target_to_host_errno(err));
}
#define safe_syscall0(type, name) \
static type safe_##name(void) \
{ \
return safe_syscall(__NR_##name); \
}
#define safe_syscall1(type, name, type1, arg1) \
static type safe_##name(type1 arg1) \
{ \
return safe_syscall(__NR_##name, arg1); \
}
#define safe_syscall2(type, name, type1, arg1, type2, arg2) \
static type safe_##name(type1 arg1, type2 arg2) \
{ \
return safe_syscall(__NR_##name, arg1, arg2); \
}
#define safe_syscall3(type, name, type1, arg1, type2, arg2, type3, arg3) \
static type safe_##name(type1 arg1, type2 arg2, type3 arg3) \
{ \
return safe_syscall(__NR_##name, arg1, arg2, arg3); \
}
#define safe_syscall4(type, name, type1, arg1, type2, arg2, type3, arg3, \
type4, arg4) \
static type safe_##name(type1 arg1, type2 arg2, type3 arg3, type4 arg4) \
{ \
return safe_syscall(__NR_##name, arg1, arg2, arg3, arg4); \
}
#define safe_syscall5(type, name, type1, arg1, type2, arg2, type3, arg3, \
type4, arg4, type5, arg5) \
static type safe_##name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5) \
{ \
return safe_syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5); \
}
#define safe_syscall6(type, name, type1, arg1, type2, arg2, type3, arg3, \
type4, arg4, type5, arg5, type6, arg6) \
static type safe_##name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5, type6 arg6) \
{ \
return safe_syscall(__NR_##name, arg1, arg2, arg3, arg4, arg5, arg6); \
}
safe_syscall3(ssize_t, read, int, fd, void *, buff, size_t, count)
safe_syscall3(ssize_t, write, int, fd, const void *, buff, size_t, count)
safe_syscall4(int, openat, int, dirfd, const char *, pathname, \
int, flags, mode_t, mode)
safe_syscall4(pid_t, wait4, pid_t, pid, int *, status, int, options, \
struct rusage *, rusage)
safe_syscall5(int, waitid, idtype_t, idtype, id_t, id, siginfo_t *, infop, \
int, options, struct rusage *, rusage)
safe_syscall3(int, execve, const char *, filename, char **, argv, char **, envp)
safe_syscall6(int, pselect6, int, nfds, fd_set *, readfds, fd_set *, writefds, \
fd_set *, exceptfds, struct timespec *, timeout, void *, sig)
safe_syscall5(int, ppoll, struct pollfd *, ufds, unsigned int, nfds,
struct timespec *, tsp, const sigset_t *, sigmask,
size_t, sigsetsize)
safe_syscall6(int, epoll_pwait, int, epfd, struct epoll_event *, events,
int, maxevents, int, timeout, const sigset_t *, sigmask,
size_t, sigsetsize)
safe_syscall6(int,futex,int *,uaddr,int,op,int,val, \
const struct timespec *,timeout,int *,uaddr2,int,val3)
safe_syscall2(int, rt_sigsuspend, sigset_t *, newset, size_t, sigsetsize)
safe_syscall2(int, kill, pid_t, pid, int, sig)
safe_syscall2(int, tkill, int, tid, int, sig)
safe_syscall3(int, tgkill, int, tgid, int, pid, int, sig)
safe_syscall3(ssize_t, readv, int, fd, const struct iovec *, iov, int, iovcnt)
safe_syscall3(ssize_t, writev, int, fd, const struct iovec *, iov, int, iovcnt)
safe_syscall5(ssize_t, preadv, int, fd, const struct iovec *, iov, int, iovcnt,
unsigned long, pos_l, unsigned long, pos_h)
safe_syscall5(ssize_t, pwritev, int, fd, const struct iovec *, iov, int, iovcnt,
unsigned long, pos_l, unsigned long, pos_h)
safe_syscall3(int, connect, int, fd, const struct sockaddr *, addr,
socklen_t, addrlen)
safe_syscall6(ssize_t, sendto, int, fd, const void *, buf, size_t, len,
int, flags, const struct sockaddr *, addr, socklen_t, addrlen)
safe_syscall6(ssize_t, recvfrom, int, fd, void *, buf, size_t, len,
int, flags, struct sockaddr *, addr, socklen_t *, addrlen)
safe_syscall3(ssize_t, sendmsg, int, fd, const struct msghdr *, msg, int, flags)
safe_syscall3(ssize_t, recvmsg, int, fd, struct msghdr *, msg, int, flags)
safe_syscall2(int, flock, int, fd, int, operation)
safe_syscall4(int, rt_sigtimedwait, const sigset_t *, these, siginfo_t *, uinfo,
const struct timespec *, uts, size_t, sigsetsize)
safe_syscall4(int, accept4, int, fd, struct sockaddr *, addr, socklen_t *, len,
int, flags)
safe_syscall2(int, nanosleep, const struct timespec *, req,
struct timespec *, rem)
#ifdef TARGET_NR_clock_nanosleep
safe_syscall4(int, clock_nanosleep, const clockid_t, clock, int, flags,
const struct timespec *, req, struct timespec *, rem)
#endif
#ifdef __NR_msgsnd
safe_syscall4(int, msgsnd, int, msgid, const void *, msgp, size_t, sz,
int, flags)
safe_syscall5(int, msgrcv, int, msgid, void *, msgp, size_t, sz,
long, msgtype, int, flags)
safe_syscall4(int, semtimedop, int, semid, struct sembuf *, tsops,
unsigned, nsops, const struct timespec *, timeout)
#else
/* This host kernel architecture uses a single ipc syscall; fake up
* wrappers for the sub-operations to hide this implementation detail.
* Annoyingly we can't include linux/ipc.h to get the constant definitions
* for the call parameter because some structs in there conflict with the
* sys/ipc.h ones. So we just define them here, and rely on them being
* the same for all host architectures.
*/
#define Q_SEMTIMEDOP 4
#define Q_MSGSND 11
#define Q_MSGRCV 12
#define Q_IPCCALL(VERSION, OP) ((VERSION) << 16 | (OP))
safe_syscall6(int, ipc, int, call, long, first, long, second, long, third,
void *, ptr, long, fifth)
static int safe_msgsnd(int msgid, const void *msgp, size_t sz, int flags)
{
return safe_ipc(Q_IPCCALL(0, Q_MSGSND), msgid, sz, flags, (void *)msgp, 0);
}
static int safe_msgrcv(int msgid, void *msgp, size_t sz, long type, int flags)
{
return safe_ipc(Q_IPCCALL(1, Q_MSGRCV), msgid, sz, flags, msgp, type);
}
static int safe_semtimedop(int semid, struct sembuf *tsops, unsigned nsops,
const struct timespec *timeout)
{
return safe_ipc(Q_IPCCALL(0, Q_SEMTIMEDOP), semid, nsops, 0, tsops,
(long)timeout);
}
#endif
#if defined(TARGET_NR_mq_open) && defined(__NR_mq_open)
safe_syscall5(int, mq_timedsend, int, mqdes, const char *, msg_ptr,
size_t, len, unsigned, prio, const struct timespec *, timeout)
safe_syscall5(int, mq_timedreceive, int, mqdes, char *, msg_ptr,
size_t, len, unsigned *, prio, const struct timespec *, timeout)
#endif
/* We do ioctl like this rather than via safe_syscall3 to preserve the
* "third argument might be integer or pointer or not present" behaviour of
* the libc function.
*/
#define safe_ioctl(...) safe_syscall(__NR_ioctl, __VA_ARGS__)
/* Similarly for fcntl. Note that callers must always:
* pass the F_GETLK64 etc constants rather than the unsuffixed F_GETLK
* use the flock64 struct rather than unsuffixed flock
* This will then work and use a 64-bit offset for both 32-bit and 64-bit hosts.
*/
#ifdef __NR_fcntl64
#define safe_fcntl(...) safe_syscall(__NR_fcntl64, __VA_ARGS__)
#else
#define safe_fcntl(...) safe_syscall(__NR_fcntl, __VA_ARGS__)
#endif
static inline int host_to_target_sock_type(int host_type)
{
int target_type;
switch (host_type & 0xf /* SOCK_TYPE_MASK */) {
case SOCK_DGRAM:
target_type = TARGET_SOCK_DGRAM;
break;
case SOCK_STREAM:
target_type = TARGET_SOCK_STREAM;
break;
default:
target_type = host_type & 0xf /* SOCK_TYPE_MASK */;
break;
}
#if defined(SOCK_CLOEXEC)
if (host_type & SOCK_CLOEXEC) {
target_type |= TARGET_SOCK_CLOEXEC;
}
#endif
#if defined(SOCK_NONBLOCK)
if (host_type & SOCK_NONBLOCK) {
target_type |= TARGET_SOCK_NONBLOCK;
}
#endif
return target_type;
}
static abi_ulong target_brk;
static abi_ulong target_original_brk;
static abi_ulong brk_page;
void target_set_brk(abi_ulong new_brk)
{
target_original_brk = target_brk = HOST_PAGE_ALIGN(new_brk);
brk_page = HOST_PAGE_ALIGN(target_brk);
}
//#define DEBUGF_BRK(message, args...) do { fprintf(stderr, (message), ## args); } while (0)
#define DEBUGF_BRK(message, args...)
/* do_brk() must return target values and target errnos. */
abi_long do_brk(abi_ulong new_brk)
{
abi_long mapped_addr;
abi_ulong new_alloc_size;
DEBUGF_BRK("do_brk(" TARGET_ABI_FMT_lx ") -> ", new_brk);
if (!new_brk) {
DEBUGF_BRK(TARGET_ABI_FMT_lx " (!new_brk)\n", target_brk);
return target_brk;
}
if (new_brk < target_original_brk) {
DEBUGF_BRK(TARGET_ABI_FMT_lx " (new_brk < target_original_brk)\n",
target_brk);
return target_brk;
}
/* If the new brk is less than the highest page reserved to the
* target heap allocation, set it and we're almost done... */
if (new_brk <= brk_page) {
/* Heap contents are initialized to zero, as for anonymous
* mapped pages. */
if (new_brk > target_brk) {
memset(g2h(target_brk), 0, new_brk - target_brk);
}
target_brk = new_brk;
DEBUGF_BRK(TARGET_ABI_FMT_lx " (new_brk <= brk_page)\n", target_brk);
return target_brk;
}
/* We need to allocate more memory after the brk... Note that
* we don't use MAP_FIXED because that will map over the top of
* any existing mapping (like the one with the host libc or qemu
* itself); instead we treat "mapped but at wrong address" as
* a failure and unmap again.
*/
new_alloc_size = HOST_PAGE_ALIGN(new_brk - brk_page);
mapped_addr = get_errno(target_mmap(brk_page, new_alloc_size,
PROT_READ|PROT_WRITE,
MAP_ANON|MAP_PRIVATE, 0, 0));
if (mapped_addr == brk_page) {
/* Heap contents are initialized to zero, as for anonymous
* mapped pages. Technically the new pages are already
* initialized to zero since they *are* anonymous mapped
* pages, however we have to take care with the contents that
* come from the remaining part of the previous page: it may
* contains garbage data due to a previous heap usage (grown
* then shrunken). */
memset(g2h(target_brk), 0, brk_page - target_brk);
target_brk = new_brk;
brk_page = HOST_PAGE_ALIGN(target_brk);
DEBUGF_BRK(TARGET_ABI_FMT_lx " (mapped_addr == brk_page)\n",
target_brk);
return target_brk;
} else if (mapped_addr != -1) {
/* Mapped but at wrong address, meaning there wasn't actually
* enough space for this brk.
*/
target_munmap(mapped_addr, new_alloc_size);
mapped_addr = -1;
DEBUGF_BRK(TARGET_ABI_FMT_lx " (mapped_addr != -1)\n", target_brk);
}
else {
DEBUGF_BRK(TARGET_ABI_FMT_lx " (otherwise)\n", target_brk);
}
#if defined(TARGET_ALPHA)
/* We (partially) emulate OSF/1 on Alpha, which requires we
return a proper errno, not an unchanged brk value. */
return -TARGET_ENOMEM;
#endif
/* For everything else, return the previous break. */
return target_brk;
}
static inline abi_long copy_from_user_fdset(fd_set *fds,
abi_ulong target_fds_addr,
int n)
{
int i, nw, j, k;
abi_ulong b, *target_fds;
nw = DIV_ROUND_UP(n, TARGET_ABI_BITS);
if (!(target_fds = lock_user(VERIFY_READ,
target_fds_addr,
sizeof(abi_ulong) * nw,
1)))
return -TARGET_EFAULT;
FD_ZERO(fds);
k = 0;
for (i = 0; i < nw; i++) {
/* grab the abi_ulong */
__get_user(b, &target_fds[i]);
for (j = 0; j < TARGET_ABI_BITS; j++) {
/* check the bit inside the abi_ulong */
if ((b >> j) & 1)
FD_SET(k, fds);
k++;
}
}
unlock_user(target_fds, target_fds_addr, 0);
return 0;
}
static inline abi_ulong copy_from_user_fdset_ptr(fd_set *fds, fd_set **fds_ptr,
abi_ulong target_fds_addr,
int n)
{
if (target_fds_addr) {
if (copy_from_user_fdset(fds, target_fds_addr, n))
return -TARGET_EFAULT;
*fds_ptr = fds;
} else {
*fds_ptr = NULL;
}
return 0;
}