linux.h

UPX 源代码

    register int    const t0 asm("t0") = fd;
    register off_t  const t1 asm("t1") = offset;
    register int          v0 asm("v0") = __NR_mmap;
    __asm__ __volatile__(
      /*"break\n"*/  /* debug only */
        "addiu $29,$29,-0x20\n"
        "\tsw $8,0x10($29)\n"
        "\tsw $9,0x14($29)\n"
        "\tsyscall\n"
        "\taddiu $29,$29, 0x20\n"
        "\tb sysret\n"
    "sysgo:"
      /*"break\n"*/  /* debug only */
        "\tsyscall\n"
    "sysret:"
        "\tbnez $7,sysbad\n"  /* $7 === a3 */
        "\tjr $31\n"
    "sysbad:"
        "\tli $2,-1\n"  /* $2 === v0; overwrite 'errno' */
        "\tjr $31"
    : "+r"(v0), "+r"(a3)  /* "+r" ==> both read and write */
    :  "r"(a0), "r"(a1), "r"(a2),      "r"(t0), "r"(t1)
    );
    return (void *)v0;
}

static ssize_t read(int fd, void *buf, size_t len)
{
#define __NR_read (3+ 4000)
    register int    const a0 asm("a0") = fd;
    register void * const a1 asm("a1") = buf;
    register size_t const a2 asm("a2") = len;
    register size_t       v0 asm("v0") = __NR_read;
    __asm__ __volatile__(
        "bal sysgo"
    : "+r"(v0)
    : "r"(a0), "r"(a1), "r"(a2)
    : "a3"
    );
    return v0;
}

static void *brk(void *addr)
{
#define __NR_brk (45+ 4000)
    register void *const a0 asm("a0") = addr;
    register void *      v0 asm("v0") = (void *)__NR_brk;
    __asm__ __volatile__(
        "bal sysgo"
    : "+r"(v0)
    : "r"(a0)
    : "a3"
    );
    return v0;
}

static int close(int fd)
{
#define __NR_close (6+ 4000)
    register int const a0 asm("a0") = fd;
    register int       v0 asm("v0") = __NR_close;
    __asm__ __volatile__(
        "bal sysgo"
    : "+r"(v0)
    : "r"(a0)
    : "a3"
    );
    return v0;
}

static void exit(int code) __attribute__ ((__noreturn__));
static void exit(int code)
{
#define __NR_exit (1+ 4000)
    register int const a0 asm("a0") = code;
    register int       v0 asm("v0") = __NR_exit;
    __asm__ __volatile__(
        "bal sysgo"
    :
    : "r"(v0), "r"(a0)
    : "a3"
    );
    for (;;) {}
}

#if 0  /*{ UNUSED */
static int munmap(void *addr, size_t len)
{
#define __NR_munmap (91+ 4000)
    register  void *const a0 asm("a0") = addr;
    register size_t const a1 asm("a2") = len;
    register size_t       v0 asm("v0");
    __asm__ __volatile__(
        "bal sysgo"
    :      "=r"(v0)
    :  [v0] "r"(__NR_munmap), "r"(a0), "r"(a1)
    : "a3"
    );
    return v0;
}
#endif  /*}*/

static int mprotect(void const *addr, size_t len, int prot)
{
#define __NR_mprotect (125+ 4000)
    register void const *const a0 asm("a0") = addr;
    register size_t      const a1 asm("a1") = len;
    register int         const a2 asm("a2") = prot;
    register size_t            v0 asm("v0") = __NR_mprotect;
    __asm__ __volatile__(
        "bal sysgo"
    : "+r"(v0)
    : "r"(a0), "r"(a1), "r"(a2)
    : "a3"
    );
    return v0;
}

static ssize_t open(char const *path, int kind, int mode)
{
#define __NR_open (5+ 4000)
    register char const *const a0 asm("a0") = path;
    register int         const a1 asm("a1") = kind;
    register int         const a2 asm("a2") = mode;
    register size_t            v0 asm("v0") = __NR_open;
    __asm__ __volatile__(
        "bal sysgo"
    : "+r"(v0)
    : "r"(a0), "r"(a1), "r"(a2)
    : "a3"
    );
    return v0;
}

#if 0  /*{ UNUSED */
static ssize_t write(int fd, void const *buf, size_t len)
{
#define __NR_write (4+ 4000)
    register int          const a0 asm("a0") = fd;
    register void const * const a1 asm("a1") = buf;
    register size_t       const a2 asm("a2") = len;
    register size_t             v0 asm("v0") = __NR_write;
    __asm__ __volatile__(
        "bal sysgo"
    : "+r"(v0)
    : "r"(a0), "r"(a1), "r"(a2)
    : "a3"
    );
    return v0;
}
#endif  /*}*/

#else  /*}{ generic */

void *brk(void *);
int close(int);
void exit(int) __attribute__((__noreturn__,__nothrow__));
void *mmap(void *, size_t, int, int, int, off_t);
int munmap(void *, size_t);
int mprotect(void const *, size_t, int);
int open(char const *, unsigned, unsigned);
ssize_t read(int, void *, size_t);
ssize_t write(int, void const *, size_t);

#endif  /*}*/


/*************************************************************************
// <elf.h>
**************************************************************************/

typedef uint16_t Elf32_Half;
typedef uint16_t Elf64_Half;
typedef uint32_t Elf32_Word;
typedef int32_t  Elf32_Sword;
typedef uint32_t Elf64_Word;
typedef int32_t  Elf64_Sword;
typedef uint64_t Elf32_Xword;
typedef int64_t  Elf32_Sxword;
typedef uint64_t Elf64_Xword;
typedef int64_t  Elf64_Sxword;
typedef uint32_t Elf32_Addr;
typedef uint64_t Elf64_Addr;
typedef uint32_t Elf32_Off;
typedef uint64_t Elf64_Off;
typedef uint16_t Elf32_Section;
typedef uint16_t Elf64_Section;
typedef Elf32_Half Elf32_Versym;
typedef Elf64_Half Elf64_Versym;


#define EI_NIDENT 16

typedef struct
{
  unsigned char e_ident[EI_NIDENT];
  Elf32_Half    e_type;
  Elf32_Half    e_machine;
  Elf32_Word    e_version;
  Elf32_Addr    e_entry;
  Elf32_Off     e_phoff;
  Elf32_Off     e_shoff;
  Elf32_Word    e_flags;
  Elf32_Half    e_ehsize;
  Elf32_Half    e_phentsize;
  Elf32_Half    e_phnum;
  Elf32_Half    e_shentsize;
  Elf32_Half    e_shnum;
  Elf32_Half    e_shstrndx;
} Elf32_Ehdr;

typedef struct
{
  unsigned char e_ident[EI_NIDENT];
  Elf64_Half    e_type;
  Elf64_Half    e_machine;
  Elf64_Word    e_version;
  Elf64_Addr    e_entry;
  Elf64_Off     e_phoff;
  Elf64_Off     e_shoff;
  Elf64_Word    e_flags;
  Elf64_Half    e_ehsize;
  Elf64_Half    e_phentsize;
  Elf64_Half    e_phnum;
  Elf64_Half    e_shentsize;
  Elf64_Half    e_shnum;
  Elf64_Half    e_shstrndx;
} Elf64_Ehdr;

typedef struct
{
  Elf32_Word    p_type;
  Elf32_Off     p_offset;
  Elf32_Addr    p_vaddr;
  Elf32_Addr    p_paddr;
  Elf32_Word    p_filesz;
  Elf32_Word    p_memsz;
  Elf32_Word    p_flags;
  Elf32_Word    p_align;
} Elf32_Phdr;

typedef struct
{
  Elf64_Word    p_type;
  Elf64_Word    p_flags;
  Elf64_Off     p_offset;
  Elf64_Addr    p_vaddr;
  Elf64_Addr    p_paddr;
  Elf64_Xword   p_filesz;
  Elf64_Xword   p_memsz;
  Elf64_Xword   p_align;
} Elf64_Phdr;

typedef struct
{
  uint32_t a_type;
  union {
      uint32_t a_val;
  } a_un;
} Elf32_auxv_t;

typedef struct
{
  uint64_t a_type;
  union
    {
      uint64_t a_val;
    } a_un;
} Elf64_auxv_t;

#define AT_NULL         0
#define AT_IGNORE       1
#define AT_PHDR         3
#define AT_PHENT        4
#define AT_PHNUM        5
#define AT_PAGESZ       6
#define AT_BASE         7
#define AT_ENTRY        9

#define ET_EXEC         2
#define ET_DYN          3

#define PF_X            1
#define PF_W            2
#define PF_R            4

#define PT_LOAD         1
#define PT_INTERP       3
#define PT_PHDR         6


/*************************************************************************
// UPX stuff
**************************************************************************/

// !!! must be the same as in p_unix.h !!!
#define OVERHEAD        2048

#define UPX_MAGIC_LE32  0x21585055          // "UPX!"

#if 1
// patch constants for our loader (le32 format)
//#define UPX1            0x31585055          // "UPX1"
#define UPX2            0x32585055          // "UPX2"
#define UPX3            0x33585055          // "UPX4"
#define UPX4            0x34585055          // "UPX4"
//#define UPX5            0x35585055          // "UPX5"
#else
// transform into relocations when using ElfLinker
extern const unsigned UPX2;
extern const unsigned UPX3;
extern const unsigned UPX4;
#define UPX2    ((unsigned) (const void *) &UPX2)
#define UPX3    ((unsigned) (const void *) &UPX3)
#define UPX4    ((unsigned) (const void *) &UPX4)
#endif


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_bytep unsigned char *
#define nrv_voidp void *


// From ../p_unix.h
struct b_info {     // 12-byte header before each compressed block
    uint32_t sz_unc;            // uncompressed_size
    uint32_t sz_cpr;            // compressed_size
    unsigned char b_method;     // compression algorithm
    unsigned char b_ftid;       // filter id
    unsigned char b_cto8;       // filter parameter
    unsigned char b_unused;
};

struct l_info       // 12-byte trailer in header for loader (offset 116)
{
    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;
};


#define CONST_CAST(type, var) \
    ((type) ((uintptr_t) (var)))


#if !defined(__attribute_cdecl)
#if defined(__i386__)
#  if (ACC_CC_GNUC >= 0x030300)
#    define __attribute_cdecl   __attribute__((__cdecl__, __used__))
#  elif (ACC_CC_GNUC >= 0x020700)
#    define __attribute_cdecl   __attribute__((__cdecl__))
#  endif
#endif
#endif
#if !defined(__attribute_cdecl)
#  define __attribute_cdecl
#endif


/*
vi:ts=4:et:nowrap
*/