/* Copyright (c) 2005-2008, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ---
* Author: Markus Gutschke
*/
/* This file includes Linux-specific support functions common to the
* coredumper and the thread lister; primarily, this is a collection
* of direct system calls, and a couple of symbols missing from
* standard header files.
* There are a few options that the including file can set to control
* the behavior of this file:
*
* SYS_CPLUSPLUS:
* The entire header file will normally be wrapped in 'extern "C" { }",
* making it suitable for compilation as both C and C++ source. If you
* do not want to do this, you can set the SYS_CPLUSPLUS macro to inhibit
* the wrapping. N.B. doing so will suppress inclusion of all prerequisite
* system header files, too. It is the caller's responsibility to provide
* the necessary definitions.
*
* SYS_ERRNO:
* All system calls will update "errno" unless overriden by setting the
* SYS_ERRNO macro prior to including this file. SYS_ERRNO should be
* an l-value.
*
* SYS_INLINE:
* New symbols will be defined "static inline", unless overridden by
* the SYS_INLINE macro.
*
* SYS_LINUX_SYSCALL_SUPPORT_H
* This macro is used to avoid multiple inclusions of this header file.
* If you need to include this file more than once, make sure to
* unset SYS_LINUX_SYSCALL_SUPPORT_H before each inclusion.
*
* SYS_PREFIX:
* New system calls will have a prefix of "sys_" unless overridden by
* the SYS_PREFIX macro. Valid values for this macro are [0..9] which
* results in prefixes "sys[0..9]_". It is also possible to set this
* macro to -1, which avoids all prefixes.
*
* This file defines a few internal symbols that all start with "LSS_".
* Do not access these symbols from outside this file. They are not part
* of the supported API.
*
* NOTE: This is a stripped down version of the official opensource
* version of linux_syscall_support.h, which lives at
* http://code.google.com/p/linux-syscall-support/
* It includes only the syscalls that are used in perftools, plus a
* few extra. Here's the breakdown:
* 1) Perftools uses these: grep -rho 'sys_[a-z0-9_A-Z]* *(' src | sort -u
* sys__exit(
* sys_clone(
* sys_close(
* sys_fcntl(
* sys_fstat(
* sys_futex(
* sys_futex1(
* sys_getcpu(
* sys_getdents(
* sys_getppid(
* sys_gettid(
* sys_lseek(
* sys_mmap(
* sys_mremap(
* sys_munmap(
* sys_open(
* sys_pipe(
* sys_prctl(
* sys_ptrace(
* sys_ptrace_detach(
* sys_read(
* sys_sched_yield(
* sys_sigaction(
* sys_sigaltstack(
* sys_sigdelset(
* sys_sigfillset(
* sys_sigprocmask(
* sys_socket(
* sys_stat(
* sys_waitpid(
* 2) These are used as subroutines of the above:
* sys_getpid -- gettid
* sys_kill -- ptrace_detach
* sys_restore -- sigaction
* sys_restore_rt -- sigaction
* sys_socketcall -- socket
* sys_wait4 -- waitpid
* 3) I left these in even though they're not used. They either
* complement the above (write vs read) or are variants (rt_sigaction):
* sys_fstat64
* sys_getdents64
* sys_llseek
* sys_mmap2
* sys_openat
* sys_rt_sigaction
* sys_rt_sigprocmask
* sys_sigaddset
* sys_sigemptyset
* sys_stat64
* sys_write
*/
#ifndef SYS_LINUX_SYSCALL_SUPPORT_H
#define SYS_LINUX_SYSCALL_SUPPORT_H
/* We currently only support x86-32, x86-64, ARM, MIPS, and PPC on Linux.
* Porting to other related platforms should not be difficult.
*/
#if (defined(__i386__) || defined(__x86_64__) || defined(__arm__) || \
defined(__mips__) || defined(__PPC__)) && defined(__linux)
#ifndef SYS_CPLUSPLUS
#ifdef __cplusplus
/* Some system header files in older versions of gcc neglect to properly
* handle being included from C++. As it appears to be harmless to have
* multiple nested 'extern "C"' blocks, just add another one here.
*/
extern "C" {
#endif
#include <errno.h>
#include <signal.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <sys/ptrace.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#if defined(__ANDROID__)
#include <sys/syscall.h>
#include <sys/linux-syscalls.h>
#else
#include <syscall.h>
#endif
#include <unistd.h>
#include <linux/unistd.h>
#include <endian.h>
#ifdef __mips__
/* Include definitions of the ABI currently in use. */
#include <sgidefs.h>
#endif
#endif
/* As glibc often provides subtly incompatible data structures (and implicit
* wrapper functions that convert them), we provide our own kernel data
* structures for use by the system calls.
* These structures have been developed by using Linux 2.6.23 headers for
* reference. Note though, we do not care about exact API compatibility
* with the kernel, and in fact the kernel often does not have a single
* API that works across architectures. Instead, we try to mimic the glibc
* API where reasonable, and only guarantee ABI compatibility with the
* kernel headers.
* Most notably, here are a few changes that were made to the structures
* defined by kernel headers:
*
* - we only define structures, but not symbolic names for kernel data
* types. For the latter, we directly use the native C datatype
* (i.e. "unsigned" instead of "mode_t").
* - in a few cases, it is possible to define identical structures for
* both 32bit (e.g. i386) and 64bit (e.g. x86-64) platforms by
* standardizing on the 64bit version of the data types. In particular,
* this means that we use "unsigned" where the 32bit headers say
* "unsigned long".
* - overall, we try to minimize the number of cases where we need to
* conditionally define different structures.
* - the "struct kernel_sigaction" class of structures have been
* modified to more closely mimic glibc's API by introducing an
* anonymous union for the function pointer.
* - a small number of field names had to have an underscore appended to
* them, because glibc defines a global macro by the same name.
*/
/* include/linux/dirent.h */
struct kernel_dirent64 {
unsigned long long d_ino;
long long d_off;
unsigned short d_reclen;
unsigned char d_type;
char d_name[256];
};
/* include/linux/dirent.h */
struct kernel_dirent {
long d_ino;
long d_off;
unsigned short d_reclen;
char d_name[256];
};
/* include/linux/time.h */
struct kernel_timespec {
long tv_sec;
long tv_nsec;
};
/* include/linux/time.h */
struct kernel_timeval {
long tv_sec;
long tv_usec;
};
/* include/linux/resource.h */
struct kernel_rusage {
struct kernel_timeval ru_utime;
struct kernel_timeval ru_stime;
long ru_maxrss;
long ru_ixrss;
long ru_idrss;
long ru_isrss;
long ru_minflt;
long ru_majflt;
long ru_nswap;
long ru_inblock;
long ru_oublock;
long ru_msgsnd;
long ru_msgrcv;
long ru_nsignals;
long ru_nvcsw;
long ru_nivcsw;
};
#if defined(__i386__) || defined(__arm__) || defined(__PPC__)
/* include/asm-{arm,i386,mips,ppc}/signal.h */
struct kernel_old_sigaction {
union {
void (*sa_handler_)(int);
void (*sa_sigaction_)(int, siginfo_t *, void *);
};
unsigned long sa_mask;
unsigned long sa_flags;
void (*sa_restorer)(void);
} __attribute__((packed,aligned(4)));
#elif (defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32)
#define kernel_old_sigaction kernel_sigaction
#endif
/* Some kernel functions (e.g. sigaction() in 2.6.23) require that the
* exactly match the size of the signal set, even though the API was
* intended to be extensible. We define our own KERNEL_NSIG to deal with
* this.
* Please note that glibc provides signals [1.._NSIG-1], whereas the
* kernel (and this header) provides the range [1..KERNEL_NSIG]. The
* actual number of signals is obviously the same, but the constants
* differ by one.
*/
#ifdef __mips__
#define KERNEL_NSIG 128
#else
#define KERNEL_NSIG 64
#endif
/* include/asm-{arm,i386,mips,x86_64}/signal.h */
struct kernel_sigset_t {
unsigned long sig[(KERNEL_NSIG + 8*sizeof(unsigned long) - 1)/
(8*sizeof(unsigned long))];
};
/* include/asm-{arm,i386,mips,x86_64,ppc}/signal.h */
struct kernel_sigaction {
#ifdef __mips__
unsigned long sa_flags;
union {
void (*sa_handler_)(int);
void (*sa_sigaction_)(int, siginfo_t *, void *);
};
struct kernel_sigset_t sa_mask;
#else
union {
void (*sa_handler_)(int);
void (*sa_sigaction_)(int, siginfo_t *, void *);
};
unsigned long sa_flags;
void (*sa_restorer)(void);
struct kernel_sigset_t sa_mask;
#endif
};
/* include/asm-{arm,i386,mips,ppc}/stat.h */
#ifdef __mips__
#if _MIPS_SIM == _MIPS_SIM_ABI64
struct kernel_stat {
#else
struct kernel_stat64 {
#endif
unsigned st_dev;
unsigned __pad0[3];
unsigned long long st_ino;
unsigned st_mode;
unsigned st_nlink;
unsigned st_uid;
unsigned st_gid;
unsigned st_rdev;
unsigned __pad1[3];
long long st_size;
unsigned st_atime_;
unsigned st_atime_nsec_;
unsigned st_mtime_;
unsigned st_mtime_nsec_;
unsigned st_ctime_;
unsigned st_ctime_nsec_;
unsigned st_blksize;
unsigned __pad2;
unsigned long long st_blocks;
};
#elif defined __PPC__
struct kernel_stat64 {
unsigned long long st_dev;
unsigned long long st_ino;
unsigned st_mode;
unsigned st_nlink;
unsigned st_uid;
unsigned st_gid;
unsigned long long st_rdev;
unsigned short int __pad2;
long long st_size;
long st_blksize;
long long st_blocks;
long st_atime_;
unsigned long st_atime_nsec_;
long st_mtime_;
unsigned long st_mtime_nsec_;
long st_ctime_;
unsigned long st_ctime_nsec_;
unsigned long __unused4;
unsigned long __unused5;
};
#else
struct kernel_stat64 {
unsigned long long st_dev;
unsigned char __pad0[4];
unsigned __st_ino;
unsigned st_mode;
unsigned st_nlink;
unsigned st_uid;
unsigned st_gid;
unsigned long long st_rdev;
unsigned char __pad3[4];
long long st_size;
unsigned st_blksize;
unsigned long long st_blocks;
unsigned st_atime_;
unsigned st_atime_nsec_;
unsigned st_mtime_;
unsigned st_mtime_nsec_;
unsigned st_ctime_;
unsigned st_ctime_nsec_;
unsigned long long st_ino;
};
#endif
/* include/asm-{arm,i386,mips,x86_64,ppc}/stat.h */
#if defined(__i386__) || defined(__arm__)
struct kernel_stat {
/* The kernel headers suggest that st_dev and st_rdev should be 32bit
* quantities encoding 12bit major and 20bit minor numbers in an interleaved
* format. In reality, we do not see useful data in the top bits. So,
* we'll leave the padding in here, until we find a better solution.
*/
unsigned short st_dev;
short pad1;
unsigned st_ino;
unsigned short st_mode;
unsigned short st_nlink;
unsigned short st_uid;
unsigned short st_gid;
unsigned short st_rdev;
short pad2;
unsigned st_size;
unsigned st_blksize;
unsigned st_blocks;
unsigned st_atime_;
unsigned st_atime_nsec_;
unsigned st_mtime_;
unsigned st_mtime_nsec_;
unsigned st_ctime_;
unsigned st_ctime_nsec_;
unsigned __unused4;
unsigned __unused5;
};
#elif defined(__x86_64__)
struct kernel_stat {
uint64_t st_dev;
uint64_t st_ino;
uint64_t st_nlink;
unsigned st_mode;
unsigned st_uid;
unsigned st_gid;
unsigned __pad0;
uint64_t st_rdev;
int64_t st_size;
int64_t st_blksize;
int64_t st_blocks;
uint64_t st_atime_;
uint64_t st_atime_nsec_;
uint64_t st_mtime_;
uint64_t st_mtime_nsec_;
uint64_t st_ctime_;
uint64_t st_ctime_nsec_;
int64_t __unused[3];
};
#elif defined(__PPC__)
struct kernel_stat {
unsigned st_dev;
unsigned long st_ino; // ino_t
unsigned long st_mode; // mode_t
unsigned short st_nlink; // nlink_t
unsigned st_uid; // uid_t
unsigned st_gid; // gid_t
unsigned st_rdev;
long st_size; // off_t
unsigned long st_blksize;
unsigned long st_blocks;
unsigned long st_atime_;
unsigned long st_atime_nsec_;
unsigned long st_mtime_;
unsigned long st_mtime_nsec_;
unsigned long st_ctime_;
unsigned long st_ctime_nsec_;
unsigned long __unused4;
unsigned long __unused5;
};
#elif (defined(__mips__) && _MIPS_SIM != _MIPS_SIM_ABI64)
struct kernel_stat {
unsigned st_dev;
int st_pad1[3];
unsigned st_ino;
unsigned st_mode;
unsigned st_nlink;
unsigned st_uid;
unsigned st_gid;
unsigned st_rdev;
int st_pad2[2];
long st_size;
int st_pad3;
long st_atime_;
long st_atime_nsec_;
long st_mtime_;
long st_mtime_nsec_;
long st_ctime_;
long st_ctime_nsec_;
int st_blksize;
int st_blocks;
int st_pad4[14];
};
#endif
// ulong is not defined in Android while used to define __llseek.
#if defined(__ANDROID__)
typedef unsigned long int ulong;
#endif
/* Definitions missing from the standard header files */
#ifndef O_DIRECTORY
#if defined(__arm__)
#define O_DIRECTORY 0040000
#else
#define O_DIRECTORY 0200000
#endif
#endif
#ifndef PR_GET_DUMPABLE
#define PR_GET_DUMPABLE 3
#endif
#ifndef PR_SET_DUMPABLE
#define PR_SET_DUMPABLE 4
#endif
#ifndef AT_FDCWD
#define AT_FDCWD (-100)
#endif
#ifndef AT_SYMLINK_NOFOLLOW
#define AT_SYMLINK_NOFOLLOW 0x100
#endif
#ifndef AT_REMOVEDIR
#define AT_REMOVEDIR 0x200
#endif
#ifndef MREMAP_FIXED
#define MREMAP_FIXED 2
#endif
#ifndef SA_RESTORER
#define SA_RESTORER 0x04000000
#endif
#if defined(__i386__)
#ifndef __NR_rt_sigaction
#define __NR_rt_sigaction 174
#define __NR_rt_sigprocmask 175
#endif
#ifndef __NR_stat64
#define __NR_stat64 195
#endif
#ifndef __NR_fstat64
#define __NR_fstat64 197
#endif
#ifndef __NR_getdents64
#define __NR_getdents64 220
#endif
#ifndef __NR_gettid
#define __NR_gettid 224
#endif
#ifndef __NR_futex
#define __NR_futex 240
#endif
#ifndef __NR_openat
#define __NR_openat 295
#endif
#ifndef __NR_getcpu
#define __NR_getcpu 318
#endif
/* End of i386 definitions */
#elif defined(__arm__)
#ifndef __syscall
#if defined(__thumb__) || defined(__ARM_EABI__)
#define __SYS_REG(name) register long __sysreg __asm__("r6") = __NR_##name;
#define __SYS_REG_LIST(regs...) [sysreg] "r" (__sysreg) , ##regs
#define __syscall(name) "swi\t0"
#define __syscall_safe(name) \
"push {r7}\n" \
"mov r7,%[sysreg]\n" \
__syscall(name)"\n" \
"pop {r7}"
#else
#define __SYS_REG(name)
#define __SYS_REG_LIST(regs...) regs
#define __syscall(name) "swi\t" __sys1(__NR_##name) ""
#define __syscall_safe(name) __syscall(name)
#endif
#endif
#ifndef __NR_rt_sigaction
#define __NR_rt_sigaction (__NR_SYSCALL_BASE + 174)
#define __NR_rt_sigprocmask (__NR_SYSCALL_BASE + 175)
#endif
#ifndef __NR_stat64
#define __NR_stat64 (__NR_SYSCALL_BASE + 195)
#endif
#ifndef __NR_fstat64
#define __NR_fstat64 (__NR_SYSCALL_BASE + 197)
#endif
#ifndef __NR_getdents64
#define __NR_getdents64 (__NR_SYSCALL_BASE + 217)
#endif
#ifndef __NR_gettid
#define __NR_gettid (__NR_SYSCALL_BASE + 224)
#endif
#ifndef __NR_futex
#define __NR_futex (__NR_SYSCALL_BASE + 240)
#endif
/* End of ARM definitions */
#elif defined(__x86_64__)
#ifndef __NR_gettid
#define __NR_gettid 186
#endif
#ifndef __NR_futex
#define __NR_futex 202
#endif
#ifndef __NR_getdents64
#define __NR_getdents64 217
#endif
#ifndef __NR_openat
#define __NR_openat 257
#endif
/* End of x86-64 definitions */
#elif defined(__mips__)
#if _MIPS_SIM == _MIPS_SIM_ABI32
#ifndef __NR_rt_sigaction
#define __NR_rt_sigaction (__NR_Linux + 194)
#define __NR_rt_sigprocmask (__NR_Linux + 195)
#endif
#ifndef __NR_stat64
#define __NR_stat64 (__NR_Linux + 213)
#endif
#ifndef __NR_fstat64
#define __NR_fstat64 (__NR_Linux + 215)
#endif
#ifndef __NR_getdents64
#define __NR_getdents64 (__NR_Linux + 219)
#endif
#ifndef __NR_gettid
#define __NR_gettid (__NR_Linux + 222)
#endif
#ifndef __NR_futex
#define __NR_futex (__NR_Linux + 238)
#endif
#ifndef __NR_openat
#define __NR_openat (__NR_Linux + 288)
#endif
#ifndef __NR_fstatat
#define __NR_fstatat (__NR_Linux + 293)
#endif
#ifndef __NR_getcpu
#define __NR_getcpu (__NR_Linux + 312)
#endif
/* End of MIPS (old 32bit API) definitions */
#elif _MIPS_SIM == _MIPS_SIM_ABI64
#ifndef __NR_gettid
#define __NR_gettid (__NR_Linux + 178)
#endif
#ifndef __NR_futex
#define __NR_futex (__NR_Linux + 194)
#endif
#ifndef __NR_openat
#define __NR_openat (__NR_Linux + 247)
#endif
#ifndef __NR_fstatat
#define __NR_fstatat (__NR_Linux + 252)
#endif
#ifndef __NR_getcpu
#define __NR_getcpu (__NR_Linux + 271)
#endif
/* End of MIPS (64bit API) definitions */
#else
#ifndef __NR_gettid
#define __NR_gettid (__NR_Linux + 178)
#endif
#ifndef __NR_futex
#define __NR_futex (__NR_Linux + 194)
#endif
#ifndef __NR_openat
#define __NR_openat (__NR_Linux + 251)
#endif
#ifndef __NR_fstatat
#define __NR_fstatat (__NR_Linux + 256)
#endif
#ifndef __NR_getcpu
#define __NR_getcpu (__NR_Linux + 275)
#endif
/* End of MIPS (new 32bit API) definitions */
#endif
/* End of MIPS definitions */
#elif defined(__PPC__)
#ifndef __NR_rt_sigaction
#define __NR_rt_sigaction 173
#define __NR_rt_sigprocmask 174
#endif
#ifndef __NR_stat64
#define __NR_stat64 195
#endif
#ifndef __NR_fstat64
#define __NR_fstat64 197
#endif
#ifndef __NR_getdents64
#define __NR_getdents64 202
#endif
#ifndef __NR_gettid
#define __NR_gettid 207
#endif
#ifndef __NR_futex
#define __NR_futex 221
#endif
#ifndef __NR_openat
#define __NR_openat 286
#endif
#ifndef __NR_getcpu
#define __NR_getcpu 302
#endif
/* End of powerpc defininitions */
#endif
/* After forking, we must make sure to only call system calls. */
#if __BOUNDED_POINTERS__
#error "Need to port invocations of syscalls for bounded ptrs"
#else
/* The core dumper and the thread lister get executed after threads
* have been suspended. As a consequence, we cannot call any functions
* that acquire locks. Unfortunately, libc wraps most system calls
* (e.g. in order to implement pthread_atfork, and to make calls
* cancellable), which means we cannot call these functions. Instead,
* we have to call syscall() directly.
*/
#undef LSS_ERRNO
#ifdef SYS_ERRNO
/* Allow the including file to override the location of errno. This can
* be useful when using clone() with the CLONE_VM option.
*/
#define LSS_ERRNO SYS_ERRNO
#else
#define LSS_ERRNO errno
#endif
#undef LSS_INLINE
#ifdef SYS_INLINE
#define LSS_INLINE SYS_INLINE
#else
#define LSS_INLINE static inline
#endif
/* Allow the including file to override the prefix used for all new
* system calls. By default, it will be set to "sys_".
*/
#undef LSS_NAME
#ifndef SYS_PREFIX
#define LSS_NAME(name) sys_##name
#elif SYS_PREFIX < 0
#define LSS_NAME(name) name
#elif SYS_PREFIX == 0
#define LSS_NAME(name) sys0_##name
#elif SYS_PREFIX == 1
#define LSS_NAME(name) sys1_##name
#elif SYS_PREFIX == 2
#define LSS_NAME(name) sys2_##name
#elif SYS_PREFIX == 3
#define LSS_NAME(name) sys3_##name
#elif SYS_PREFIX == 4
#define LSS_NAME(name) sys4_##name
#elif SYS_PREFIX == 5
#define LSS_NAME(name) sys5_##name
#elif SYS_PREFIX == 6
#define LSS_NAME(name) sys6_##name
#elif SYS_PREFIX == 7
#define LSS_NAME(name) sys7_##name
#elif SYS_PREFIX == 8
#define LSS_NAME(name) sys8_##name
#elif SYS_PREFIX == 9
#define LSS_NAME(name) sys9_##name
#endif
#undef LSS_RETURN
#if (defined(__i386__) || defined(__x86_64__) || defined(__arm__))
/* Failing system calls return a negative result in the range of
* -1..-4095. These are "errno" values with the sign inverted.
*/
#define LSS_RETURN(type, res) \
do { \
if ((unsigned long)(res) >= (unsigned long)(-4095)) { \
LSS_ERRNO = -(res); \
res = -1; \
} \
return (type) (res); \
} while (0)
#elif defined(__mips__)
/* On MIPS, failing system calls return -1, and set errno in a
* separate CPU register.
*/
#define LSS_RETURN(type, res, err) \
do { \
if (err) { \
LSS_ERRNO = (res); \
res = -1; \
} \
return (type) (res); \
} while (0)
#elif defined(__PPC__)
/* On PPC, failing system calls return -1, and set errno in a
* separate CPU register. See linux/unistd.h.
*/
#define LSS_RETURN(type, res, err) \
do { \
if (err & 0x10000000 ) { \
LSS_ERRNO = (res); \
res = -1; \
} \
return (type) (res); \
} while (0)
#endif
#if defined(__i386__)
#if defined(NO_FRAME_POINTER) && (100 * __GNUC__ + __GNUC_MINOR__ >= 404)
/* This only works for GCC-4.4 and above -- the first version to use
.cfi directives for dwarf unwind info. */
#define CFI_ADJUST_CFA_OFFSET(adjust) \
".cfi_adjust_cfa_offset " #adjust "\n"
#else
#define CFI_ADJUST_CFA_OFFSET(adjust) /**/
#endif
/* In PIC mode (e.g. when building shared libraries), gcc for i386
* reserves ebx. Unfortunately, most distribution ship with implementations
* of _syscallX() which clobber ebx.
* Also, most definitions of _syscallX() neglect to mark "memory" as being
* clobbered. This causes problems with compilers, that do a better job
* at optimizing across __asm__ calls.
* So, we just have to redefine all of the _syscallX() macros.
*/
#undef LSS_BODY
#define LSS_BODY(type,args...) \
long __res; \
__asm__ __volatile__("push %%ebx\n" \
CFI_ADJUST_CFA_OFFSET(4) \
"movl %2,%%ebx\n" \
"int $0x80\n" \
"pop %%ebx\n" \
CFI_ADJUST_CFA_OFFSET(-4) \
args \
: "esp", "memory"); \
LSS_RETURN(type,__res)
#undef _syscall0
#define _syscall0(type,name) \
type LSS_NAME(name)(void) { \
long __res; \
__asm__ volatile("int $0x80" \
: "=a" (__res) \
: "0" (__NR_##name) \
: "memory"); \
LSS_RETURN(type,__res); \
}
#undef _syscall1
#define _syscall1(type,name,type1,arg1) \
type LSS_NAME(name)(type1 arg1) { \
LSS_BODY(type, \
: "=a" (__res) \
: "0" (__NR_##name), "ri" ((long)(arg1))); \
}
#undef _syscall2
#define _syscall2(type,name,type1,arg1,type2,arg2) \
type LSS_NAME(name)(type1 arg1,type2 arg2) { \
LSS_BODY(type, \
: "=a" (__res) \
: "0" (__NR_##name),"ri" ((long)(arg1)), "c" ((long)(arg2))); \
}
#undef _syscall3
#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \
type LSS_NAME(name)(type1 arg1,type2 arg2,type3 arg3) { \
LSS_BODY(type, \
: "=a" (__res) \
: "0" (__NR_##name), "ri" ((long)(arg1)), "c" ((long)(arg2)), \
"d" ((long)(arg3))); \
}
#undef _syscall4
#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \
LSS_BODY(type, \
: "=a" (__res) \
: "0" (__NR_##name), "ri" ((long)(arg1)), "c" ((long)(arg2)), \
"d" ((long)(arg3)),"S" ((long)(arg4))); \
}
#undef _syscall5
#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5) { \
long __res; \
__asm__ __volatile__("push %%ebx\n" \
"movl %2,%%ebx\n" \
"movl %1,%%eax\n" \
"int $0x80\n" \
"pop %%ebx" \
: "=a" (__res) \
: "i" (__NR_##name), "ri" ((long)(arg1)), \
"c" ((long)(arg2)), "d" ((long)(arg3)), \
"S" ((long)(arg4)), "D" ((long)(arg5)) \
: "esp", "memory"); \
LSS_RETURN(type,__res); \
}
#undef _syscall6
#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5,type6,arg6) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5, type6 arg6) { \
long __res; \
struct { long __a1; long __a6; } __s = { (long)arg1, (long) arg6 }; \
__asm__ __volatile__("push %%ebp\n" \
"push %%ebx\n" \
"movl 4(%2),%%ebp\n" \
"movl 0(%2), %%ebx\n" \
"movl %1,%%eax\n" \
"int $0x80\n" \
"pop %%ebx\n" \
"pop %%ebp" \
: "=a" (__res) \
: "i" (__NR_##name), "0" ((long)(&__s)), \
"c" ((long)(arg2)), "d" ((long)(arg3)), \
"S" ((long)(arg4)), "D" ((long)(arg5)) \
: "esp", "memory"); \
LSS_RETURN(type,__res); \
}
LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack,
int flags, void *arg, int *parent_tidptr,
void *newtls, int *child_tidptr) {
long __res;
__asm__ __volatile__(/* if (fn == NULL)
* return -EINVAL;
*/
"movl %3,%%ecx\n"
"jecxz 1f\n"
/* if (child_stack == NULL)
* return -EINVAL;
*/
"movl %4,%%ecx\n"
"jecxz 1f\n"
/* Set up alignment of the child stack:
* child_stack = (child_stack & ~0xF) - 20;
*/
"andl $-16,%%ecx\n"
"subl $20,%%ecx\n"
/* Push "arg" and "fn" onto the stack that will be
* used by the child.
*/
"movl %6,%%eax\n"
"movl %%eax,4(%%ecx)\n"
"movl %3,%%eax\n"
"movl %%eax,(%%ecx)\n"
/* %eax = syscall(%eax = __NR_clone,
* %ebx = flags,
* %ecx = child_stack,
* %edx = parent_tidptr,
* %esi = newtls,
* %edi = child_tidptr)
* Also, make sure that %ebx gets preserved as it is
* used in PIC mode.
*/
"movl %8,%%esi\n"
"movl %7,%%edx\n"
"movl %5,%%eax\n"
"movl %9,%%edi\n"
"pushl %%ebx\n"
"movl %%eax,%%ebx\n"
"movl %2,%%eax\n"
"int $0x80\n"
/* In the parent: restore %ebx
* In the child: move "fn" into %ebx
*/
"popl %%ebx\n"
/* if (%eax != 0)
* return %eax;
*/
"test %%eax,%%eax\n"
"jnz 1f\n"
/* In the child, now. Terminate frame pointer chain.
*/
"movl $0,%%ebp\n"
/* Call "fn". "arg" is already on the stack.
*/
"call *%%ebx\n"
/* Call _exit(%ebx). Unfortunately older versions
* of gcc restrict the number of arguments that can
* be passed to asm(). So, we need to hard-code the
* system call number.
*/
"movl %%eax,%%ebx\n"
"movl $1,%%eax\n"
"int $0x80\n"
/* Return to parent.
*/
"1:\n"
: "=a" (__res)
: "0"(-EINVAL), "i"(__NR_clone),
"m"(fn), "m"(child_stack), "m"(flags), "m"(arg),
"m"(parent_tidptr), "m"(newtls), "m"(child_tidptr)
: "esp", "memory", "ecx", "edx", "esi", "edi");
LSS_RETURN(int, __res);
}
LSS_INLINE void (*LSS_NAME(restore_rt)(void))(void) {
/* On i386, the kernel does not know how to return from a signal
* handler. Instead, it relies on user space to provide a
* restorer function that calls the {rt_,}sigreturn() system call.
* Unfortunately, we cannot just reference the glibc version of this
* function, as glibc goes out of its way to make it inaccessible.
*/
void (*res)(void);
__asm__ __volatile__("call 2f\n"
"0:.align 16\n"
"1:movl %1,%%eax\n"
"int $0x80\n"
"2:popl %0\n"
"addl $(1b-0b),%0\n"
: "=a" (res)
: "i" (__NR_rt_sigreturn));
return res;
}
LSS_INLINE void (*LSS_NAME(restore)(void))(void) {
/* On i386, the kernel does not know how to return from a signal
* handler. Instead, it relies on user space to provide a
* restorer function that calls the {rt_,}sigreturn() system call.
* Unfortunately, we cannot just reference the glibc version of this
* function, as glibc goes out of its way to make it inaccessible.
*/
void (*res)(void);
__asm__ __volatile__("call 2f\n"
"0:.align 16\n"
"1:pop %%eax\n"
"movl %1,%%eax\n"
"int $0x80\n"
"2:popl %0\n"
"addl $(1b-0b),%0\n"
: "=a" (res)
: "i" (__NR_sigreturn));
return res;
}
#elif defined(__x86_64__)
/* There are no known problems with any of the _syscallX() macros
* currently shipping for x86_64, but we still need to be able to define
* our own version so that we can override the location of the errno
* location (e.g. when using the clone() system call with the CLONE_VM
* option).
*/
#undef LSS_ENTRYPOINT
#define LSS_ENTRYPOINT "syscall\n"
/* The x32 ABI has 32 bit longs, but the syscall interface is 64 bit.
* We need to explicitly cast to an unsigned 64 bit type to avoid implicit
* sign extension. We can't cast pointers directly because those are
* 32 bits, and gcc will dump ugly warnings about casting from a pointer
* to an integer of a different size.
*/
#undef LSS_SYSCALL_ARG
#define LSS_SYSCALL_ARG(a) ((uint64_t)(uintptr_t)(a))
#undef _LSS_RETURN
#define _LSS_RETURN(type, res, cast) \
do { \
if ((uint64_t)(res) >= (uint64_t)(-4095)) { \
LSS_ERRNO = -(res); \
res = -1; \
} \
return (type)(cast)(res); \
} while (0)
#undef LSS_RETURN
#define LSS_RETURN(type, res) _LSS_RETURN(type, res, uintptr_t)
#undef _LSS_BODY
#define _LSS_BODY(nr, type, name, cast, ...) \
long long __res; \
__asm__ __volatile__(LSS_BODY_ASM##nr LSS_ENTRYPOINT \
: "=a" (__res) \
: "0" (__NR_##name) LSS_BODY_ARG##nr(__VA_ARGS__) \
: LSS_BODY_CLOBBER##nr "r11", "rcx", "memory"); \
_LSS_RETURN(type, __res, cast)
#undef LSS_BODY
#define LSS_BODY(nr, type, name, args...) \
_LSS_BODY(nr, type, name, uintptr_t, ## args)
#undef LSS_BODY_ASM0
#undef LSS_BODY_ASM1
#undef LSS_BODY_ASM2
#undef LSS_BODY_ASM3
#undef LSS_BODY_ASM4
#undef LSS_BODY_ASM5
#undef LSS_BODY_ASM6
#define LSS_BODY_ASM0
#define LSS_BODY_ASM1 LSS_BODY_ASM0
#define LSS_BODY_ASM2 LSS_BODY_ASM1
#define LSS_BODY_ASM3 LSS_BODY_ASM2
#define LSS_BODY_ASM4 LSS_BODY_ASM3 "movq %5,%%r10;"
#define LSS_BODY_ASM5 LSS_BODY_ASM4 "movq %6,%%r8;"
#define LSS_BODY_ASM6 LSS_BODY_ASM5 "movq %7,%%r9;"
#undef LSS_BODY_CLOBBER0
#undef LSS_BODY_CLOBBER1
#undef LSS_BODY_CLOBBER2
#undef LSS_BODY_CLOBBER3
#undef LSS_BODY_CLOBBER4
#undef LSS_BODY_CLOBBER5
#undef LSS_BODY_CLOBBER6
#define LSS_BODY_CLOBBER0
#define LSS_BODY_CLOBBER1 LSS_BODY_CLOBBER0
#define LSS_BODY_CLOBBER2 LSS_BODY_CLOBBER1
#define LSS_BODY_CLOBBER3 LSS_BODY_CLOBBER2
#define LSS_BODY_CLOBBER4 LSS_BODY_CLOBBER3 "r10",
#define LSS_BODY_CLOBBER5 LSS_BODY_CLOBBER4 "r8",
#define LSS_BODY_CLOBBER6 LSS_BODY_CLOBBER5 "r9",
#undef LSS_BODY_ARG0
#undef LSS_BODY_ARG1
#undef LSS_BODY_ARG2
#undef LSS_BODY_ARG3
#undef LSS_BODY_ARG4
#undef LSS_BODY_ARG5
#undef LSS_BODY_ARG6
#define LSS_BODY_ARG0()
#define LSS_BODY_ARG1(arg1) \
LSS_BODY_ARG0(), "D" (arg1)
#define LSS_BODY_ARG2(arg1, arg2) \
LSS_BODY_ARG1(arg1), "S" (arg2)
#define LSS_BODY_ARG3(arg1, arg2, arg3) \
LSS_BODY_ARG2(arg1, arg2), "d" (arg3)
#define LSS_BODY_ARG4(arg1, arg2, arg3, arg4) \
LSS_BODY_ARG3(arg1, arg2, arg3), "r" (arg4)
#define LSS_BODY_ARG5(arg1, arg2, arg3, arg4, arg5) \
LSS_BODY_ARG4(arg1, arg2, arg3, arg4), "r" (arg5)
#define LSS_BODY_ARG6(arg1, arg2, arg3, arg4, arg5, arg6) \
LSS_BODY_ARG5(arg1, arg2, arg3, arg4, arg5), "r" (arg6)
#undef _syscall0
#define _syscall0(type,name) \
type LSS_NAME(name)() { \
LSS_BODY(0, type, name); \
}
#undef _syscall1
#define _syscall1(type,name,type1,arg1) \
type LSS_NAME(name)(type1 arg1) { \
LSS_BODY(1, type, name, LSS_SYSCALL_ARG(arg1)); \
}
#undef _syscall2
#define _syscall2(type,name,type1,arg1,type2,arg2) \
type LSS_NAME(name)(type1 arg1, type2 arg2) { \
LSS_BODY(2, type, name, LSS_SYSCALL_ARG(arg1), LSS_SYSCALL_ARG(arg2));\
}
#undef _syscall3
#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3) { \
LSS_BODY(3, type, name, LSS_SYSCALL_ARG(arg1), LSS_SYSCALL_ARG(arg2), \
LSS_SYSCALL_ARG(arg3)); \
}
#undef _syscall4
#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \
LSS_BODY(4, type, name, LSS_SYSCALL_ARG(arg1), LSS_SYSCALL_ARG(arg2), \
LSS_SYSCALL_ARG(arg3), LSS_SYSCALL_ARG(arg4));\
}
#undef _syscall5
#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5) { \
LSS_BODY(5, type, name, LSS_SYSCALL_ARG(arg1), LSS_SYSCALL_ARG(arg2), \
LSS_SYSCALL_ARG(arg3), LSS_SYSCALL_ARG(arg4), \
LSS_SYSCALL_ARG(arg5)); \
}
#undef _syscall6
#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5,type6,arg6) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5, type6 arg6) { \
LSS_BODY(6, type, name, LSS_SYSCALL_ARG(arg1), LSS_SYSCALL_ARG(arg2), \
LSS_SYSCALL_ARG(arg3), LSS_SYSCALL_ARG(arg4), \
LSS_SYSCALL_ARG(arg5), LSS_SYSCALL_ARG(arg6));\
}
LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack,
int flags, void *arg, int *parent_tidptr,
void *newtls, int *child_tidptr) {
long long __res;
{
__asm__ __volatile__(/* if (fn == NULL)
* return -EINVAL;
*/
"testq %4,%4\n"
"jz 1f\n"
/* if (child_stack == NULL)
* return -EINVAL;
*/
"testq %5,%5\n"
"jz 1f\n"
/* Set up alignment of the child stack:
* child_stack = (child_stack & ~0xF) - 16;
*/
"andq $-16,%5\n"
"subq $16,%5\n"
/* Push "arg" and "fn" onto the stack that will be
* used by the child.
*/
"movq %7,8(%5)\n"
"movq %4,0(%5)\n"
/* %rax = syscall(%rax = __NR_clone,
* %rdi = flags,
* %rsi = child_stack,
* %rdx = parent_tidptr,
* %r8 = new_tls,
* %r10 = child_tidptr)
*/
"movq %2,%%rax\n"
"movq %9,%%r8\n"
"movq %10,%%r10\n"
"syscall\n"
/* if (%rax != 0)
* return;
*/
"testq %%rax,%%rax\n"
"jnz 1f\n"
/* In the child. Terminate frame pointer chain.
*/
"xorq %%rbp,%%rbp\n"
/* Call "fn(arg)".
*/
"popq %%rax\n"
"popq %%rdi\n"
"call *%%rax\n"
/* Call _exit(%ebx).
*/
"movq %%rax,%%rdi\n"
"movq %3,%%rax\n"
"syscall\n"
/* Return to parent.
*/
"1:\n"
: "=a" (__res)
: "0"(-EINVAL), "i"(__NR_clone), "i"(__NR_exit),
"r"(LSS_SYSCALL_ARG(fn)),
"S"(LSS_SYSCALL_ARG(child_stack)),
"D"(LSS_SYSCALL_ARG(flags)),
"r"(LSS_SYSCALL_ARG(arg)),
"d"(LSS_SYSCALL_ARG(parent_tidptr)),
"r"(LSS_SYSCALL_ARG(newtls)),
"r"(LSS_SYSCALL_ARG(child_tidptr))
: "rsp", "memory", "r8", "r10", "r11", "rcx");
}
LSS_RETURN(int, __res);
}
LSS_INLINE void (*LSS_NAME(restore_rt)(void))(void) {
/* On x86-64, the kernel does not know how to return from
* a signal handler. Instead, it relies on user space to provide a
* restorer function that calls the rt_sigreturn() system call.
* Unfortunately, we cannot just reference the glibc version of this
* function, as glibc goes out of its way to make it inaccessible.
*/
long long res;
__asm__ __volatile__("call 2f\n"
"0:.align 16\n"
"1:movq %1,%%rax\n"
"syscall\n"
"2:popq %0\n"
"addq $(1b-0b),%0\n"
: "=a" (res)
: "i" (__NR_rt_sigreturn));
return (void (*)(void))(uintptr_t)res;
}
#elif defined(__arm__)
/* Most definitions of _syscallX() neglect to mark "memory" as being
* clobbered. This causes problems with compilers, that do a better job
* at optimizing across __asm__ calls.
* So, we just have to redefine all fo the _syscallX() macros.
*/
#undef LSS_REG
#define LSS_REG(r,a) register long __r##r __asm__("r"#r) = (long)a
/* r0..r3 are scratch registers and not preserved across function
* calls. We need to first evaluate the first 4 syscall arguments
* and store them on stack. They must be loaded into r0..r3 after
* all function calls to avoid r0..r3 being clobbered.
*/
#undef LSS_SAVE_ARG
#define LSS_SAVE_ARG(r,a) long __tmp##r = (long)a
#undef LSS_LOAD_ARG
#define LSS_LOAD_ARG(r) register long __r##r __asm__("r"#r) = __tmp##r
#undef LSS_BODY
#define LSS_BODY(type, name, args...) \
register long __res_r0 __asm__("r0"); \
long __res; \
__SYS_REG(name) \
__asm__ __volatile__ (__syscall_safe(name) \
: "=r"(__res_r0) \
: __SYS_REG_LIST(args) \
: "lr", "memory"); \
__res = __res_r0; \
LSS_RETURN(type, __res)
#undef _syscall0
#define _syscall0(type, name) \
type LSS_NAME(name)() { \
LSS_BODY(type, name); \
}
#undef _syscall1
#define _syscall1(type, name, type1, arg1) \
type LSS_NAME(name)(type1 arg1) { \
/* There is no need for using a volatile temp. */ \
LSS_REG(0, arg1); \
LSS_BODY(type, name, "r"(__r0)); \
}
#undef _syscall2
#define _syscall2(type, name, type1, arg1, type2, arg2) \
type LSS_NAME(name)(type1 arg1, type2 arg2) { \
LSS_SAVE_ARG(0, arg1); \
LSS_SAVE_ARG(1, arg2); \
LSS_LOAD_ARG(0); \
LSS_LOAD_ARG(1); \
LSS_BODY(type, name, "r"(__r0), "r"(__r1)); \
}
#undef _syscall3
#define _syscall3(type, name, type1, arg1, type2, arg2, type3, arg3) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3) { \
LSS_SAVE_ARG(0, arg1); \
LSS_SAVE_ARG(1, arg2); \
LSS_SAVE_ARG(2, arg3); \
LSS_LOAD_ARG(0); \
LSS_LOAD_ARG(1); \
LSS_LOAD_ARG(2); \
LSS_BODY(type, name, "r"(__r0), "r"(__r1), "r"(__r2)); \
}
#undef _syscall4
#define _syscall4(type, name, type1, arg1, type2, arg2, type3, arg3, \
type4, arg4) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \
LSS_SAVE_ARG(0, arg1); \
LSS_SAVE_ARG(1, arg2); \
LSS_SAVE_ARG(2, arg3); \
LSS_SAVE_ARG(3, arg4); \
LSS_LOAD_ARG(0); \
LSS_LOAD_ARG(1); \
LSS_LOAD_ARG(2); \
LSS_LOAD_ARG(3); \
LSS_BODY(type, name, "r"(__r0), "r"(__r1), "r"(__r2), "r"(__r3)); \
}
#undef _syscall5
#define _syscall5(type, name, type1, arg1, type2, arg2, type3, arg3, \
type4, arg4, type5, arg5) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5) { \
LSS_SAVE_ARG(0, arg1); \
LSS_SAVE_ARG(1, arg2); \
LSS_SAVE_ARG(2, arg3); \
LSS_SAVE_ARG(3, arg4); \
LSS_REG(4, arg5); \
LSS_LOAD_ARG(0); \
LSS_LOAD_ARG(1); \
LSS_LOAD_ARG(2); \
LSS_LOAD_ARG(3); \
LSS_BODY(type, name, "r"(__r0), "r"(__r1), "r"(__r2), "r"(__r3), \
"r"(__r4)); \
}
#undef _syscall6
#define _syscall6(type, name, type1, arg1, type2, arg2, type3, arg3, \
type4, arg4, type5, arg5, type6, arg6) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5, type6 arg6) { \
LSS_SAVE_ARG(0, arg1); \
LSS_SAVE_ARG(1, arg2); \
LSS_SAVE_ARG(2, arg3); \
LSS_SAVE_ARG(3, arg4); \
LSS_REG(4, arg5); \
LSS_REG(5, arg6); \
LSS_LOAD_ARG(0); \
LSS_LOAD_ARG(1); \
LSS_LOAD_ARG(2); \
LSS_LOAD_ARG(3); \
LSS_BODY(type, name, "r"(__r0), "r"(__r1), "r"(__r2), "r"(__r3), \
"r"(__r4), "r"(__r5)); \
}
LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack,
int flags, void *arg, int *parent_tidptr,
void *newtls, int *child_tidptr) {
register long __res __asm__("r5");
{
if (fn == NULL || child_stack == NULL) {
__res = -EINVAL;
goto clone_exit;
}
/* stash first 4 arguments on stack first because we can only load
* them after all function calls.
*/
int tmp_flags = flags;
int * tmp_stack = (int*) child_stack;
void * tmp_ptid = parent_tidptr;
void * tmp_tls = newtls;
register int *__ctid __asm__("r4") = child_tidptr;
/* Push "arg" and "fn" onto the stack that will be
* used by the child.
*/
*(--tmp_stack) = (int) arg;
*(--tmp_stack) = (int) fn;
/* We must load r0..r3 last after all possible function calls. */
register int __flags __asm__("r0") = tmp_flags;
register void *__stack __asm__("r1") = tmp_stack;
register void *__ptid __asm__("r2") = tmp_ptid;
register void *__tls __asm__("r3") = tmp_tls;
/* %r0 = syscall(%r0 = flags,
* %r1 = child_stack,
* %r2 = parent_tidptr,
* %r3 = newtls,
* %r4 = child_tidptr)
*/
__SYS_REG(clone)
__asm__ __volatile__(/* %r0 = syscall(%r0 = flags,
* %r1 = child_stack,
* %r2 = parent_tidptr,
* %r3 = newtls,
* %r4 = child_tidptr)
*/
"push {r7}\n"
"mov r7,%1\n"
__syscall(clone)"\n"
/* if (%r0 != 0)
* return %r0;
*/
"movs %0,r0\n"
"bne 1f\n"
/* In the child, now. Call "fn(arg)".
*/
"ldr r0,[sp, #4]\n"
"mov lr,pc\n"
"ldr pc,[sp]\n"
/* Call _exit(%r0), which never returns. We only
* need to set r7 for EABI syscall ABI but we do
* this always to simplify code sharing between
* old and new syscall ABIs.
*/
"mov r7,%2\n"
__syscall(exit)"\n"
/* Pop r7 from the stack only in the parent.
*/
"1: pop {r7}\n"
: "=r" (__res)
: "r"(__sysreg),
"i"(__NR_exit), "r"(__stack), "r"(__flags),
"r"(__ptid), "r"(__tls), "r"(__ctid)
: "cc", "lr", "memory");
}
clone_exit:
LSS_RETURN(int, __res);
}
#elif defined(__mips__)
#undef LSS_REG
#define LSS_REG(r,a) register unsigned long __r##r __asm__("$"#r) = \
(unsigned long)(a)
#if _MIPS_SIM == _MIPS_SIM_ABI32
// See http://sources.redhat.com/ml/libc-alpha/2004-10/msg00050.html
// or http://www.linux-mips.org/archives/linux-mips/2004-10/msg00142.html
#define MIPS_SYSCALL_CLOBBERS "$1", "$3", "$8", "$9", "$10", "$11", "$12",\
"$13", "$14", "$15", "$24", "$25", "memory"
#else
#define MIPS_SYSCALL_CLOBBERS "$1", "$3", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "$25", "memory"
#endif
#undef LSS_BODY
#define LSS_BODY(type,name,r7,...) \
register unsigned long __v0 __asm__("$2") = __NR_##name; \
__asm__ __volatile__ ("syscall\n" \
: "=&r"(__v0), r7 (__r7) \
: "0"(__v0), ##__VA_ARGS__ \
: MIPS_SYSCALL_CLOBBERS); \
LSS_RETURN(type, __v0, __r7)
#undef _syscall0
#define _syscall0(type, name) \
type LSS_NAME(name)() { \
register unsigned long __r7 __asm__("$7"); \
LSS_BODY(type, name, "=r"); \
}
#undef _syscall1
#define _syscall1(type, name, type1, arg1) \
type LSS_NAME(name)(type1 arg1) { \
register unsigned long __r7 __asm__("$7"); \
LSS_REG(4, arg1); LSS_BODY(type, name, "=r", "r"(__r4)); \
}
#undef _syscall2
#define _syscall2(type, name, type1, arg1, type2, arg2) \
type LSS_NAME(name)(type1 arg1, type2 arg2) { \
register unsigned long __r7 __asm__("$7"); \
LSS_REG(4, arg1); LSS_REG(5, arg2); \
LSS_BODY(type, name, "=r", "r"(__r4), "r"(__r5)); \
}
#undef _syscall3
#define _syscall3(type, name, type1, arg1, type2, arg2, type3, arg3) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3) { \
register unsigned long __r7 __asm__("$7"); \
LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \
LSS_BODY(type, name, "=r", "r"(__r4), "r"(__r5), "r"(__r6)); \
}
#undef _syscall4
#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \
LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \
LSS_REG(7, arg4); \
LSS_BODY(type, name, "+r", "r"(__r4), "r"(__r5), "r"(__r6)); \
}
#undef _syscall5
#if _MIPS_SIM == _MIPS_SIM_ABI32
/* The old 32bit MIPS system call API passes the fifth and sixth argument
* on the stack, whereas the new APIs use registers "r8" and "r9".
*/
#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5) { \
LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \
LSS_REG(7, arg4); \
register unsigned long __v0 __asm__("$2"); \
__asm__ __volatile__ (".set noreorder\n" \
"lw $2, %6\n" \
"subu $29, 32\n" \
"sw $2, 16($29)\n" \
"li $2, %2\n" \
"syscall\n" \
"addiu $29, 32\n" \
".set reorder\n" \
: "=&r"(__v0), "+r" (__r7) \
: "i" (__NR_##name), "r"(__r4), "r"(__r5), \
"r"(__r6), "m" ((unsigned long)arg5) \
: MIPS_SYSCALL_CLOBBERS); \
LSS_RETURN(type, __v0, __r7); \
}
#else
#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5) { \
LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \
LSS_REG(7, arg4); LSS_REG(8, arg5); \
LSS_BODY(type, name, "+r", "r"(__r4), "r"(__r5), "r"(__r6), \
"r"(__r8)); \
}
#endif
#undef _syscall6
#if _MIPS_SIM == _MIPS_SIM_ABI32
/* The old 32bit MIPS system call API passes the fifth and sixth argument
* on the stack, whereas the new APIs use registers "r8" and "r9".
*/
#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5,type6,arg6) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5, type6 arg6) { \
LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \
LSS_REG(7, arg4); \
register unsigned long __v0 __asm__("$2"); \
__asm__ __volatile__ (".set noreorder\n" \
"lw $2, %6\n" \
"lw $8, %7\n" \
"subu $29, 32\n" \
"sw $2, 16($29)\n" \
"sw $8, 20($29)\n" \
"li $2, %2\n" \
"syscall\n" \
"addiu $29, 32\n" \
".set reorder\n" \
: "=&r"(__v0), "+r" (__r7) \
: "i" (__NR_##name), "r"(__r4), "r"(__r5), \
"r"(__r6), "r" ((unsigned long)arg5), \
"r" ((unsigned long)arg6) \
: MIPS_SYSCALL_CLOBBERS); \
LSS_RETURN(type, __v0, __r7); \
}
#else
#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \
type5,arg5,type6,arg6) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5,type6 arg6) { \
LSS_REG(4, arg1); LSS_REG(5, arg2); LSS_REG(6, arg3); \
LSS_REG(7, arg4); LSS_REG(8, arg5); LSS_REG(9, arg6); \
LSS_BODY(type, name, "+r", "r"(__r4), "r"(__r5), "r"(__r6), \
"r"(__r8), "r"(__r9)); \
}
#endif
LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack,
int flags, void *arg, int *parent_tidptr,
void *newtls, int *child_tidptr) {
register unsigned long __v0 __asm__("$2");
register unsigned long __r7 __asm__("$7") = (unsigned long)newtls;
{
register int __flags __asm__("$4") = flags;
register void *__stack __asm__("$5") = child_stack;
register void *__ptid __asm__("$6") = parent_tidptr;
register int *__ctid __asm__("$8") = child_tidptr;
__asm__ __volatile__(
#if _MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 32
"subu $29,24\n"
#elif _MIPS_SIM == _MIPS_SIM_NABI32
"sub $29,16\n"
#else
"dsubu $29,16\n"
#endif
/* if (fn == NULL || child_stack == NULL)
* return -EINVAL;
*/
"li %0,%2\n"
"beqz %5,1f\n"
"beqz %6,1f\n"
/* Push "arg" and "fn" onto the stack that will be
* used by the child.
*/
#if _MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 32
"subu %6,32\n"
"sw %5,0(%6)\n"
"sw %8,4(%6)\n"
#elif _MIPS_SIM == _MIPS_SIM_NABI32
"sub %6,32\n"
"sw %5,0(%6)\n"
"sw %8,8(%6)\n"
#else
"dsubu %6,32\n"
"sd %5,0(%6)\n"
"sd %8,8(%6)\n"
#endif
/* $7 = syscall($4 = flags,
* $5 = child_stack,
* $6 = parent_tidptr,
* $7 = newtls,
* $8 = child_tidptr)
*/
"li $2,%3\n"
"syscall\n"
/* if ($7 != 0)
* return $2;
*/
"bnez $7,1f\n"
"bnez $2,1f\n"
/* In the child, now. Call "fn(arg)".
*/
#if _MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 32
"lw $25,0($29)\n"
"lw $4,4($29)\n"
#elif _MIPS_SIM == _MIPS_SIM_NABI32
"lw $25,0($29)\n"
"lw $4,8($29)\n"
#else
"ld $25,0($29)\n"
"ld $4,8($29)\n"
#endif
"jalr $25\n"
/* Call _exit($2)
*/
"move $4,$2\n"
"li $2,%4\n"
"syscall\n"
"1:\n"
#if _MIPS_SIM == _MIPS_SIM_ABI32 && _MIPS_SZPTR == 32
"addu $29, 24\n"
#elif _MIPS_SIM == _MIPS_SIM_NABI32
"add $29, 16\n"
#else
"daddu $29,16\n"
#endif
: "=&r" (__v0), "=r" (__r7)
: "i"(-EINVAL), "i"(__NR_clone), "i"(__NR_exit),
"r"(fn), "r"(__stack), "r"(__flags), "r"(arg),
"r"(__ptid), "r"(__r7), "r"(__ctid)
: "$9", "$10", "$11", "$12", "$13", "$14", "$15",
"$24", "memory");
}
LSS_RETURN(int, __v0, __r7);
}
#elif defined (__PPC__)
#undef LSS_LOADARGS_0
#define LSS_LOADARGS_0(name, dummy...) \
__sc_0 = __NR_##name
#undef LSS_LOADARGS_1
#define LSS_LOADARGS_1(name, arg1) \
LSS_LOADARGS_0(name); \
__sc_3 = (unsigned long) (arg1)
#undef LSS_LOADARGS_2
#define LSS_LOADARGS_2(name, arg1, arg2) \
LSS_LOADARGS_1(name, arg1); \
__sc_4 = (unsigned long) (arg2)
#undef LSS_LOADARGS_3
#define LSS_LOADARGS_3(name, arg1, arg2, arg3) \
LSS_LOADARGS_2(name, arg1, arg2); \
__sc_5 = (unsigned long) (arg3)
#undef LSS_LOADARGS_4
#define LSS_LOADARGS_4(name, arg1, arg2, arg3, arg4) \
LSS_LOADARGS_3(name, arg1, arg2, arg3); \
__sc_6 = (unsigned long) (arg4)
#undef LSS_LOADARGS_5
#define LSS_LOADARGS_5(name, arg1, arg2, arg3, arg4, arg5) \
LSS_LOADARGS_4(name, arg1, arg2, arg3, arg4); \
__sc_7 = (unsigned long) (arg5)
#undef LSS_LOADARGS_6
#define LSS_LOADARGS_6(name, arg1, arg2, arg3, arg4, arg5, arg6) \
LSS_LOADARGS_5(name, arg1, arg2, arg3, arg4, arg5); \
__sc_8 = (unsigned long) (arg6)
#undef LSS_ASMINPUT_0
#define LSS_ASMINPUT_0 "0" (__sc_0)
#undef LSS_ASMINPUT_1
#define LSS_ASMINPUT_1 LSS_ASMINPUT_0, "1" (__sc_3)
#undef LSS_ASMINPUT_2
#define LSS_ASMINPUT_2 LSS_ASMINPUT_1, "2" (__sc_4)
#undef LSS_ASMINPUT_3
#define LSS_ASMINPUT_3 LSS_ASMINPUT_2, "3" (__sc_5)
#undef LSS_ASMINPUT_4
#define LSS_ASMINPUT_4 LSS_ASMINPUT_3, "4" (__sc_6)
#undef LSS_ASMINPUT_5
#define LSS_ASMINPUT_5 LSS_ASMINPUT_4, "5" (__sc_7)
#undef LSS_ASMINPUT_6
#define LSS_ASMINPUT_6 LSS_ASMINPUT_5, "6" (__sc_8)
#undef LSS_BODY
#define LSS_BODY(nr, type, name, args...) \
long __sc_ret, __sc_err; \
{ \
register unsigned long __sc_0 __asm__ ("r0"); \
register unsigned long __sc_3 __asm__ ("r3"); \
register unsigned long __sc_4 __asm__ ("r4"); \
register unsigned long __sc_5 __asm__ ("r5"); \
register unsigned long __sc_6 __asm__ ("r6"); \
register unsigned long __sc_7 __asm__ ("r7"); \
register unsigned long __sc_8 __asm__ ("r8"); \
\
LSS_LOADARGS_##nr(name, args); \
__asm__ __volatile__ \
("sc\n\t" \
"mfcr %0" \
: "=&r" (__sc_0), \
"=&r" (__sc_3), "=&r" (__sc_4), \
"=&r" (__sc_5), "=&r" (__sc_6), \
"=&r" (__sc_7), "=&r" (__sc_8) \
: LSS_ASMINPUT_##nr \
: "cr0", "ctr", "memory", \
"r9", "r10", "r11", "r12"); \
__sc_ret = __sc_3; \
__sc_err = __sc_0; \
} \
LSS_RETURN(type, __sc_ret, __sc_err)
#undef _syscall0
#define _syscall0(type, name) \
type LSS_NAME(name)(void) { \
LSS_BODY(0, type, name); \
}
#undef _syscall1
#define _syscall1(type, name, type1, arg1) \
type LSS_NAME(name)(type1 arg1) { \
LSS_BODY(1, type, name, arg1); \
}
#undef _syscall2
#define _syscall2(type, name, type1, arg1, type2, arg2) \
type LSS_NAME(name)(type1 arg1, type2 arg2) { \
LSS_BODY(2, type, name, arg1, arg2); \
}
#undef _syscall3
#define _syscall3(type, name, type1, arg1, type2, arg2, type3, arg3) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3) { \
LSS_BODY(3, type, name, arg1, arg2, arg3); \
}
#undef _syscall4
#define _syscall4(type, name, type1, arg1, type2, arg2, type3, arg3, \
type4, arg4) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4) { \
LSS_BODY(4, type, name, arg1, arg2, arg3, arg4); \
}
#undef _syscall5
#define _syscall5(type, name, type1, arg1, type2, arg2, type3, arg3, \
type4, arg4, type5, arg5) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5) { \
LSS_BODY(5, type, name, arg1, arg2, arg3, arg4, arg5); \
}
#undef _syscall6
#define _syscall6(type, name, type1, arg1, type2, arg2, type3, arg3, \
type4, arg4, type5, arg5, type6, arg6) \
type LSS_NAME(name)(type1 arg1, type2 arg2, type3 arg3, type4 arg4, \
type5 arg5, type6 arg6) { \
LSS_BODY(6, type, name, arg1, arg2, arg3, arg4, arg5, arg6); \
}
/* clone function adapted from glibc 2.3.6 clone.S */
/* TODO(csilvers): consider wrapping some args up in a struct, like we
* do for i386's _syscall6, so we can compile successfully on gcc 2.95
*/
LSS_INLINE int LSS_NAME(clone)(int (*fn)(void *), void *child_stack,
int flags, void *arg, int *parent_tidptr,
void *newtls, int *child_tidptr) {
long __ret, __err;
{
register int (*__fn)(void *) __asm__ ("r8") = fn;
register void *__cstack __asm__ ("r4") = child_stack;
register int __flags __asm__ ("r3") = flags;
register void * __arg __asm__ ("r9") = arg;
register int * __ptidptr __asm__ ("r5") = parent_tidptr;
register void * __newtls __asm__ ("r6") = newtls;
register int * __ctidptr __asm__ ("r7") = child_tidptr;
__asm__ __volatile__(
/* check for fn == NULL
* and child_stack == NULL
*/
"cmpwi cr0, %6, 0\n\t"
"cmpwi cr1, %7, 0\n\t"
"cror cr0*4+eq, cr1*4+eq, cr0*4+eq\n\t"
"beq- cr0, 1f\n\t"
/* set up stack frame for child */
"clrrwi %7, %7, 4\n\t"
"li 0, 0\n\t"
"stwu 0, -16(%7)\n\t"
/* fn, arg, child_stack are saved across the syscall: r28-30 */
"mr 28, %6\n\t"
"mr 29, %7\n\t"
"mr 27, %9\n\t"
/* syscall */
"li 0, %4\n\t"
/* flags already in r3
* child_stack already in r4
* ptidptr already in r5
* newtls already in r6
* ctidptr already in r7
*/
"sc\n\t"
/* Test if syscall was successful */
"cmpwi cr1, 3, 0\n\t"
"crandc cr1*4+eq, cr1*4+eq, cr0*4+so\n\t"
"bne- cr1, 1f\n\t"
/* Do the function call */
"mtctr 28\n\t"
"mr 3, 27\n\t"
"bctrl\n\t"
/* Call _exit(r3) */
"li 0, %5\n\t"
"sc\n\t"
/* Return to parent */
"1:\n"
"mfcr %1\n\t"
"mr %0, 3\n\t"
: "=r" (__ret), "=r" (__err)
: "0" (-1), "1" (EINVAL),
"i" (__NR_clone), "i" (__NR_exit),
"r" (__fn), "r" (__cstack), "r" (__flags),
"r" (__arg), "r" (__ptidptr), "r" (__newtls),
"r" (__ctidptr)
: "cr0", "cr1", "memory", "ctr",
"r0", "r29", "r27", "r28");
}
LSS_RETURN(int, __ret, __err);
}
#endif
#define __NR__exit __NR_exit
#define __NR__gettid __NR_gettid
#define __NR__mremap __NR_mremap
LSS_INLINE _syscall1(int, close, int, f)
LSS_INLINE _syscall1(int, _exit, int, e)
LSS_INLINE _syscall3(int, fcntl, int, f,
int, c, long, a)
LSS_INLINE _syscall2(int, fstat, int, f,
struct kernel_stat*, b)
LSS_INLINE _syscall4(int, futex, int*, a,
int, o, int, v,
struct kernel_timespec*, t)
LSS_INLINE _syscall3(int, getdents, int, f,
struct kernel_dirent*, d, int, c)
#ifdef __NR_getdents64
LSS_INLINE _syscall3(int, getdents64, int, f,
struct kernel_dirent64*, d, int, c)
#endif
LSS_INLINE _syscall0(pid_t, getpid)
LSS_INLINE _syscall0(pid_t, getppid)
LSS_INLINE _syscall0(pid_t, _gettid)
LSS_INLINE _syscall2(int, kill, pid_t, p,
int, s)
#if defined(__x86_64__)
/* Need to make sure off_t isn't truncated to 32-bits under x32. */
LSS_INLINE off_t LSS_NAME(lseek)(int f, off_t o, int w) {
_LSS_BODY(3, off_t, lseek, off_t, LSS_SYSCALL_ARG(f), (uint64_t)(o),
LSS_SYSCALL_ARG(w));
}
#else
LSS_INLINE _syscall3(off_t, lseek, int, f,
off_t, o, int, w)
#endif
LSS_INLINE _syscall2(int, munmap, void*, s,
size_t, l)
LSS_INLINE _syscall5(void*, _mremap, void*, o,
size_t, os, size_t, ns,
unsigned long, f, void *, a)
LSS_INLINE _syscall3(int, open, const char*, p,
int, f, int, m)
LSS_INLINE _syscall2(int, prctl, int, o,
long, a)
LSS_INLINE _syscall4(long, ptrace, int, r,
pid_t, p, void *, a, void *, d)
LSS_INLINE _syscall3(ssize_t, read, int, f,
void *, b, size_t, c)
LSS_INLINE _syscall4(int, rt_sigaction, int, s,
const struct kernel_sigaction*, a,
struct kernel_sigaction*, o, size_t, c)
LSS_INLINE _syscall4(int, rt_sigprocmask, int, h,
const struct kernel_sigset_t*, s,
struct kernel_sigset_t*, o, size_t, c);
LSS_INLINE _syscall0(int, sched_yield)
LSS_INLINE _syscall2(int, sigaltstack, const stack_t*, s,
const stack_t*, o)
LSS_INLINE _syscall2(int, stat, const char*, f,
struct kernel_stat*, b)
LSS_INLINE _syscall3(ssize_t, write, int, f,
const void *, b, size_t, c)
#if defined(__NR_getcpu)
LSS_INLINE _syscall3(long, getcpu, unsigned *, cpu,
unsigned *, node, void *, unused);
#endif
#if defined(__x86_64__) || \
(defined(__mips__) && _MIPS_SIM != _MIPS_SIM_ABI32)
LSS_INLINE _syscall3(int, socket, int, d,
int, t, int, p)
#endif
#if defined(__x86_64__)
/* Need to make sure __off64_t isn't truncated to 32-bits under x32. */
LSS_INLINE void* LSS_NAME(mmap)(void *s, size_t l, int p, int f, int d,
__off64_t o) {
LSS_BODY(6, void*, mmap, LSS_SYSCALL_ARG(s), LSS_SYSCALL_ARG(l),
LSS_SYSCALL_ARG(p), LSS_SYSCALL_ARG(f),
LSS_SYSCALL_ARG(d), (uint64_t)(o));
}
LSS_INLINE int LSS_NAME(sigaction)(int signum,
const struct kernel_sigaction *act,
struct kernel_sigaction *oldact) {
/* On x86_64, the kernel requires us to always set our own
* SA_RESTORER in order to be able to return from a signal handler.
* This function must have a "magic" signature that the "gdb"
* (and maybe the kernel?) can recognize.
*/
if (act != NULL && !(act->sa_flags & SA_RESTORER)) {
struct kernel_sigaction a = *act;
a.sa_flags |= SA_RESTORER;
a.sa_restorer = LSS_NAME(restore_rt)();
return LSS_NAME(rt_sigaction)(signum, &a, oldact,
(KERNEL_NSIG+7)/8);
} else {
return LSS_NAME(rt_sigaction)(signum, act, oldact,
(KERNEL_NSIG+7)/8);
}
}
LSS_INLINE int LSS_NAME(sigprocmask)(int how,
const struct kernel_sigset_t *set,
struct kernel_sigset_t *oldset) {
return LSS_NAME(rt_sigprocmask)(how, set, oldset, (KERNEL_NSIG+7)/8);
}
#endif
#if defined(__x86_64__) || \
defined(__arm__) || \
(defined(__mips__) && _MIPS_SIM != _MIPS_SIM_ABI32)
LSS_INLINE _syscall4(pid_t, wait4, pid_t, p,
int*, s, int, o,
struct kernel_rusage*, r)
LSS_INLINE pid_t LSS_NAME(waitpid)(pid_t pid, int *status, int options){
return LSS_NAME(wait4)(pid, status, options, 0);
}
#endif
#if (defined(__i386__) || defined(__x86_64__) || defined(__arm__)) && \
!defined(__ANDROID__)
LSS_INLINE _syscall4(int, openat, int, d, const char *, p, int, f, int, m)
#endif
LSS_INLINE int LSS_NAME(sigemptyset)(struct kernel_sigset_t *set) {
memset(&set->sig, 0, sizeof(set->sig));
return 0;
}
LSS_INLINE int LSS_NAME(sigfillset)(struct kernel_sigset_t *set) {
memset(&set->sig, -1, sizeof(set->sig));
return 0;
}
LSS_INLINE int LSS_NAME(sigaddset)(struct kernel_sigset_t *set,
int signum) {
if (signum < 1 || signum > (int)(8*sizeof(set->sig))) {
LSS_ERRNO = EINVAL;
return -1;
} else {
set->sig[(signum - 1)/(8*sizeof(set->sig[0]))]
|= 1UL << ((signum - 1) % (8*sizeof(set->sig[0])));
return 0;
}
}
LSS_INLINE int LSS_NAME(sigdelset)(struct kernel_sigset_t *set,
int signum) {
if (signum < 1 || signum > (int)(8*sizeof(set->sig))) {
LSS_ERRNO = EINVAL;
return -1;
} else {
set->sig[(signum - 1)/(8*sizeof(set->sig[0]))]
&= ~(1UL << ((signum - 1) % (8*sizeof(set->sig[0]))));
return 0;
}
}
#if defined(__i386__) || \
defined(__arm__) || \
(defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32) || defined(__PPC__)
#define __NR__sigaction __NR_sigaction
#define __NR__sigprocmask __NR_sigprocmask
LSS_INLINE _syscall2(int, fstat64, int, f,
struct kernel_stat64 *, b)
LSS_INLINE _syscall5(int, _llseek, uint, fd, ulong, hi, ulong, lo,
loff_t *, res, uint, wh)
#ifdef __PPC64__
LSS_INLINE _syscall6(void*, mmap, void*, s,
size_t, l, int, p,
int, f, int, d,
off_t, o)
#else
#ifndef __ARM_EABI__
/* Not available on ARM EABI Linux. */
LSS_INLINE _syscall1(void*, mmap, void*, a)
#endif
LSS_INLINE _syscall6(void*, mmap2, void*, s,
size_t, l, int, p,
int, f, int, d,
off_t, o)
#endif
LSS_INLINE _syscall3(int, _sigaction, int, s,
const struct kernel_old_sigaction*, a,
struct kernel_old_sigaction*, o)
LSS_INLINE _syscall3(int, _sigprocmask, int, h,
const unsigned long*, s,
unsigned long*, o)
LSS_INLINE _syscall2(int, stat64, const char *, p,
struct kernel_stat64 *, b)
LSS_INLINE int LSS_NAME(sigaction)(int signum,
const struct kernel_sigaction *act,
struct kernel_sigaction *oldact) {
int old_errno = LSS_ERRNO;
int rc;
struct kernel_sigaction a;
if (act != NULL) {
a = *act;
#ifdef __i386__
/* On i386, the kernel requires us to always set our own
* SA_RESTORER when using realtime signals. Otherwise, it does not
* know how to return from a signal handler. This function must have
* a "magic" signature that the "gdb" (and maybe the kernel?) can
* recognize.
* Apparently, a SA_RESTORER is implicitly set by the kernel, when
* using non-realtime signals.
*
* TODO: Test whether ARM needs a restorer
*/
if (!(a.sa_flags & SA_RESTORER)) {
a.sa_flags |= SA_RESTORER;
a.sa_restorer = (a.sa_flags & SA_SIGINFO)
? LSS_NAME(restore_rt)() : LSS_NAME(restore)();
}
#endif
}
rc = LSS_NAME(rt_sigaction)(signum, act ? &a : act, oldact,
(KERNEL_NSIG+7)/8);
if (rc < 0 && LSS_ERRNO == ENOSYS) {
struct kernel_old_sigaction oa, ooa, *ptr_a = &oa, *ptr_oa = &ooa;
if (!act) {
ptr_a = NULL;
} else {
oa.sa_handler_ = act->sa_handler_;
memcpy(&oa.sa_mask, &act->sa_mask, sizeof(oa.sa_mask));
#ifndef __mips__
oa.sa_restorer = act->sa_restorer;
#endif
oa.sa_flags = act->sa_flags;
}
if (!oldact) {
ptr_oa = NULL;
}
LSS_ERRNO = old_errno;
rc = LSS_NAME(_sigaction)(signum, ptr_a, ptr_oa);
if (rc == 0 && oldact) {
if (act) {
memcpy(oldact, act, sizeof(*act));
} else {
memset(oldact, 0, sizeof(*oldact));
}
oldact->sa_handler_ = ptr_oa->sa_handler_;
oldact->sa_flags = ptr_oa->sa_flags;
memcpy(&oldact->sa_mask, &ptr_oa->sa_mask, sizeof(ptr_oa->sa_mask));
#ifndef __mips__
oldact->sa_restorer = ptr_oa->sa_restorer;
#endif
}
}
return rc;
}
LSS_INLINE int LSS_NAME(sigprocmask)(int how,
const struct kernel_sigset_t *set,
struct kernel_sigset_t *oldset) {
int olderrno = LSS_ERRNO;
int rc = LSS_NAME(rt_sigprocmask)(how, set, oldset, (KERNEL_NSIG+7)/8);
if (rc < 0 && LSS_ERRNO == ENOSYS) {
LSS_ERRNO = olderrno;
if (oldset) {
LSS_NAME(sigemptyset)(oldset);
}
rc = LSS_NAME(_sigprocmask)(how,
set ? &set->sig[0] : NULL,
oldset ? &oldset->sig[0] : NULL);
}
return rc;
}
#endif
#if defined(__PPC__)
#undef LSS_SC_LOADARGS_0
#define LSS_SC_LOADARGS_0(dummy...)
#undef LSS_SC_LOADARGS_1
#define LSS_SC_LOADARGS_1(arg1) \
__sc_4 = (unsigned long) (arg1)
#undef LSS_SC_LOADARGS_2
#define LSS_SC_LOADARGS_2(arg1, arg2) \
LSS_SC_LOADARGS_1(arg1); \
__sc_5 = (unsigned long) (arg2)
#undef LSS_SC_LOADARGS_3
#define LSS_SC_LOADARGS_3(arg1, arg2, arg3) \
LSS_SC_LOADARGS_2(arg1, arg2); \
__sc_6 = (unsigned long) (arg3)
#undef LSS_SC_LOADARGS_4
#define LSS_SC_LOADARGS_4(arg1, arg2, arg3, arg4) \
LSS_SC_LOADARGS_3(arg1, arg2, arg3); \
__sc_7 = (unsigned long) (arg4)
#undef LSS_SC_LOADARGS_5
#define LSS_SC_LOADARGS_5(arg1, arg2, arg3, arg4, arg5) \
LSS_SC_LOADARGS_4(arg1, arg2, arg3, arg4); \
__sc_8 = (unsigned long) (arg5)
#undef LSS_SC_BODY
#define LSS_SC_BODY(nr, type, opt, args...) \
long __sc_ret, __sc_err; \
{ \
register unsigned long __sc_0 __asm__ ("r0") = __NR_socketcall; \
register unsigned long __sc_3 __asm__ ("r3") = opt; \
register unsigned long __sc_4 __asm__ ("r4"); \
register unsigned long __sc_5 __asm__ ("r5"); \
register unsigned long __sc_6 __asm__ ("r6"); \
register unsigned long __sc_7 __asm__ ("r7"); \
register unsigned long __sc_8 __asm__ ("r8"); \
LSS_SC_LOADARGS_##nr(args); \
__asm__ __volatile__ \
("stwu 1, -48(1)\n\t" \
"stw 4, 20(1)\n\t" \
"stw 5, 24(1)\n\t" \
"stw 6, 28(1)\n\t" \
"stw 7, 32(1)\n\t" \
"stw 8, 36(1)\n\t" \
"addi 4, 1, 20\n\t" \
"sc\n\t" \
"mfcr %0" \
: "=&r" (__sc_0), \
"=&r" (__sc_3), "=&r" (__sc_4), \
"=&r" (__sc_5), "=&r" (__sc_6), \
"=&r" (__sc_7), "=&r" (__sc_8) \
: LSS_ASMINPUT_##nr \
: "cr0", "ctr", "memory"); \
__sc_ret = __sc_3; \
__sc_err = __sc_0; \
} \
LSS_RETURN(type, __sc_ret, __sc_err)
LSS_INLINE int LSS_NAME(socket)(int domain, int type, int protocol) {
LSS_SC_BODY(3, int, 1, domain, type, protocol);
}
#endif
#if defined(__i386__) || \
(defined(__arm__) && !defined(__ARM_EABI__)) || \
(defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32)
/* See sys_socketcall in net/socket.c in kernel source.
* It de-multiplexes on its first arg and unpacks the arglist
* array in its second arg.
*/
LSS_INLINE _syscall2(long, socketcall, int, c, unsigned long*, a)
LSS_INLINE int LSS_NAME(socket)(int domain, int type, int protocol) {
unsigned long args[3] = {
(unsigned long) domain,
(unsigned long) type,
(unsigned long) protocol
};
return LSS_NAME(socketcall)(1, args);
}
#elif defined(__ARM_EABI__)
LSS_INLINE _syscall3(int, socket, int, d,
int, t, int, p)
#endif
#if defined(__i386__) || defined(__PPC__) || \
(defined(__mips__) && _MIPS_SIM == _MIPS_SIM_ABI32)
LSS_INLINE _syscall3(pid_t, waitpid, pid_t, p,
int*, s, int, o)
#endif
#if defined(__mips__)
/* sys_pipe() on MIPS has non-standard calling conventions, as it returns
* both file handles through CPU registers.
*/
LSS_INLINE int LSS_NAME(pipe)(int *p) {
register unsigned long __v0 __asm__("$2") = __NR_pipe;
register unsigned long __v1 __asm__("$3");
register unsigned long __r7 __asm__("$7");
__asm__ __volatile__ ("syscall\n"
: "=&r"(__v0), "=&r"(__v1), "+r" (__r7)
: "0"(__v0)
: "$8", "$9", "$10", "$11", "$12",
"$13", "$14", "$15", "$24", "memory");
if (__r7) {
LSS_ERRNO = __v0;
return -1;
} else {
p[0] = __v0;
p[1] = __v1;
return 0;
}
}
#else
LSS_INLINE _syscall1(int, pipe, int *, p)
#endif
LSS_INLINE pid_t LSS_NAME(gettid)() {
pid_t tid = LSS_NAME(_gettid)();
if (tid != -1) {
return tid;
}
return LSS_NAME(getpid)();
}
LSS_INLINE void *LSS_NAME(mremap)(void *old_address, size_t old_size,
size_t new_size, int flags, ...) {
va_list ap;
void *new_address, *rc;
va_start(ap, flags);
new_address = va_arg(ap, void *);
rc = LSS_NAME(_mremap)(old_address, old_size, new_size,
flags, new_address);
va_end(ap);
return rc;
}
LSS_INLINE int LSS_NAME(ptrace_detach)(pid_t pid) {
/* PTRACE_DETACH can sometimes forget to wake up the tracee and it
* then sends job control signals to the real parent, rather than to
* the tracer. We reduce the risk of this happening by starting a
* whole new time slice, and then quickly sending a SIGCONT signal
* right after detaching from the tracee.
*/
int rc, err;
LSS_NAME(sched_yield)();
rc = LSS_NAME(ptrace)(PTRACE_DETACH, pid, (void *)0, (void *)0);
err = LSS_ERRNO;
LSS_NAME(kill)(pid, SIGCONT);
LSS_ERRNO = err;
return rc;
}
#endif
#if defined(__cplusplus) && !defined(SYS_CPLUSPLUS)
}
#endif
#endif
#endif