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2000-05-19 16:04:55 +00:00
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/* linux.hh -- common stuff the the Linux stub loaders
This file is part of the UPX executable compressor.
Copyright (C) 1996-2000 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1996-2000 Laszlo Molnar
UPX and the UCL library are free software; you can redistribute them
and/or modify them 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; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
Markus F.X.J. Oberhumer Laszlo Molnar
markus.oberhumer@jk.uni-linz.ac.at ml1050@cdata.tvnet.hu
*/
#if !defined(__linux__) || !defined(__i386__)
# error "this stub must be compiled under linux/i386"
#endif
/*************************************************************************
// includes
**************************************************************************/
#define __need_timeval
#include <sys/types.h>
#include <sys/resource.h>
#include <elf.h>
#include <fcntl.h>
#include <sched.h>
#include <time.h>
#include <linux/errno.h>
#include <linux/mman.h>
#include <linux/personality.h>
#include <linux/timex.h>
#include <linux/unistd.h>
/*************************************************************************
// constants and types
**************************************************************************/
// !!! must be the same as in p_unix.h !!!
#define OVERHEAD 2048
#define UPX_MAGIC_LE32 0x21585055 // "UPX!"
#undef int32_t
#undef uint32_t
#define int32_t int
#define uint32_t unsigned int
typedef int nrv_int;
typedef int nrv_int32;
typedef unsigned int nrv_uint;
typedef unsigned int nrv_uint32;
#define nrv_byte unsigned char
#define nrv_voidp void *
// From ../p_unix.h
struct l_info { // 12-byte trailer in header for loader
uint32_t l_checksum;
uint32_t l_magic;
uint16_t l_lsize;
uint8_t l_version;
uint8_t l_format;
};
struct p_info // 12-byte packed program header follows stub loader
{
uint32_t p_progid;
uint32_t p_filesize;
uint32_t p_blocksize;
};
/*************************************************************************
// syscalls
//
// Because of different <asm/unistd.h> versions and subtle bugs
// in both gcc and egcs we define all syscalls manually.
//
// Also, errno conversion is not necessary in our case, and we
// use optimized assembly statements to further decrease the size.
**************************************************************************/
#undef _syscall0
#undef _syscall1
#undef _syscall2
#undef _syscall3
#ifndef __NR__exit
# define __NR__exit __NR_exit
#endif
#define Z0(x) (__builtin_constant_p(x) && (long)(x) == 0)
#define Z1(x) (__builtin_constant_p(x) && (long)(x) >= -128 && (long)(x) <= 127)
#define _syscall0(type,name) \
type name(void) \
{ \
long __res; \
if (Z1(__NR_##name)) { \
__asm__ __volatile__ ("push %1; popl %0; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name)); \
} else { \
__asm__ __volatile__ ("int $0x80" \
: "=a" (__res) \
: "a" (__NR_##name)); \
} \
return (type) __res; \
}
#define _syscall1(type,name,type1,arg1) \
type name(type1 arg1) \
{ \
long __res; \
if (Z1(__NR_##name)) { \
if (Z0(arg1)) { \
__asm__ __volatile__ ("push %1; popl %0; xorl %%ebx,%%ebx; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name) \
: "ebx"); \
} else if (Z1(arg1)) { \
__asm__ __volatile__ ("push %1; popl %0; push %2; popl %%ebx; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"g" ((long)(arg1)) \
: "ebx"); \
} else { \
__asm__ __volatile__ ("push %1; popl %0; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"b" ((long)(arg1))); \
} \
} else { \
__asm__ __volatile__ ("int $0x80" \
: "=a" (__res) \
: "a" (__NR_##name),"b" ((long)(arg1))); \
} \
return (type) __res; \
}
#define _syscall2(type,name,type1,arg1,type2,arg2) \
type name(type1 arg1,type2 arg2) \
{ \
long __res; \
if (Z1(__NR_##name)) { \
if (Z0(arg1) && Z0(arg2)) { \
__asm__ __volatile__ ("push %1; popl %0; xorl %%ebx,%%ebx; xorl %%ecx,%%ecx; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name) \
: "ebx", "ecx"); \
} else if (Z0(arg1) && Z1(arg2)) { \
__asm__ __volatile__ ("push %1; popl %0; xorl %%ebx,%%ebx; push %2; popl %%ecx; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"g" ((long)(arg2)) \
: "ebx", "ecx"); \
} else if (Z1(arg1) && Z0(arg2)) { \
__asm__ __volatile__ ("push %1; popl %0; push %2; popl %%ebx; xorl %%ecx,%%ecx; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"g" ((long)(arg1)) \
: "ebx", "ecx"); \
} else if (Z1(arg1) && Z1(arg2)) { \
__asm__ __volatile__ ("push %1; popl %0; push %2; popl %%ebx; push %3; popl %%ecx; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"g" ((long)(arg1)),"g" ((long)(arg2)) \
: "ebx", "ecx"); \
} else if (Z0(arg1)) { \
__asm__ __volatile__ ("push %1; popl %0; xorl %%ebx,%%ebx; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"c" ((long)(arg2)) \
: "ebx"); \
} else if (Z0(arg2)) { \
__asm__ __volatile__ ("push %1; popl %0; xorl %%ecx,%%ecx; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"b" ((long)(arg1)) \
: "ecx"); \
} else if (Z1(arg1)) { \
__asm__ __volatile__ ("push %1; popl %0; push %2; popl %%ebx; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"g" ((long)(arg1)),"c" ((long)(arg2)) \
: "ebx"); \
} else if (Z1(arg2)) { \
__asm__ __volatile__ ("push %1; popl %0; push %3; popl %%ecx; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"b" ((long)(arg1)),"g" ((long)(arg2)) \
: "ecx"); \
} else { \
__asm__ __volatile__ ("push %1; popl %0; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2))); \
} \
} else { \
__asm__ __volatile__ ("int $0x80" \
: "=a" (__res) \
: "a" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2))); \
} \
return (type) __res; \
}
#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \
type name(type1 arg1,type2 arg2,type3 arg3) \
{ \
long __res; \
if (Z1(__NR_##name)) { \
__asm__ __volatile__ ("push %1; popl %0; int $0x80" \
: "=a" (__res) \
: "g" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
"d" ((long)(arg3))); \
} else { \
__asm__ __volatile__ ("int $0x80" \
: "=a" (__res) \
: "a" (__NR_##name),"b" ((long)(arg1)),"c" ((long)(arg2)), \
"d" ((long)(arg3))); \
} \
return (type) __res; \
}
#define access syscall_access
#define fcntl syscall_fcntl
#define getcwd syscall_getcwd
#define getrusage syscall_getrusage
#define gettimeofday syscall_gettimeofday
#define nanosleep syscall_nanosleep
#define open syscall_open
#define personality syscall_personality
static inline _syscall2(int,access,const char *,file,int,mode)
static inline _syscall1(int,adjtimex,struct timex *,ntx)
static inline _syscall1(void *,brk,void *,high)
static inline _syscall1(int,close,int,fd)
static inline _syscall3(int,execve,const char *,file,char **,argv,char **,envp)
static inline _syscall1(int,_exit,int,exitcode)
static inline _syscall3(int,fcntl,int,fd,int,cmd,long,arg)
static inline _syscall2(int,ftruncate,int,fd,size_t,len)
static inline _syscall0(pid_t,fork)
static inline _syscall2(int,getcwd,char *,buf,unsigned long,size);
static inline _syscall0(pid_t,getpid)
static inline _syscall2(int,getrusage,int,who,struct rusage *,usage);
static inline _syscall2(int,gettimeofday,struct timeval *,tv,void *,tz)
static inline _syscall3(off_t,lseek,int,fd,off_t,offset,int,whence)
static inline _syscall1(caddr_t,mmap,const int *,args)
static inline _syscall3(int,mprotect,void *,addr,size_t,len,int,prot)
static inline _syscall3(int,msync,const void *,start,size_t,length,int,flags)
static inline _syscall2(int,munmap,void *,start,size_t,length)
static inline _syscall2(int,nanosleep,const struct timespec *,rqtp,struct timespec *,rmtp)
static inline _syscall3(int,open,const char *,file,int,flag,int,mode)
static inline _syscall1(int,personality,unsigned long,persona)
static inline _syscall3(int,read,int,fd,char *,buf,off_t,count)
static inline _syscall3(pid_t,waitpid,pid_t,pid,int *,wait_stat,int,options)
static inline _syscall3(int,write,int,fd,const char *,buf,off_t,count)
static inline _syscall1(int,unlink,const char *,file)
#define exit _exit
#undef Z0
#undef Z1
/*
vi:ts=4:et:nowrap
*/