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tccpe.c

/*
 *  TCCPE.C - PE file output for the TinyC Compiler
 * 
 *  Copyright (c) 2005 grischka
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

typedef unsigned char BYTE;
typedef unsigned short WORD;
typedef unsigned long DWORD;
#define ST static

/* XXX: move that to TCC ? */
int verbose = 0;

/* definitions below are from winnt.h */

typedef struct _IMAGE_DOS_HEADER {  /* DOS .EXE header */
    WORD e_magic;       /* Magic number */
    WORD e_cblp;        /* Bytes on last page of file */
    WORD e_cp;                /* Pages in file */
    WORD e_crlc;        /* Relocations */
    WORD e_cparhdr;           /* Size of header in paragraphs */
    WORD e_minalloc;          /* Minimum extra paragraphs needed */
    WORD e_maxalloc;          /* Maximum extra paragraphs needed */
    WORD e_ss;                /* Initial (relative) SS value */
    WORD e_sp;                /* Initial SP value */
    WORD e_csum;        /* Checksum */
    WORD e_ip;                /* Initial IP value */
    WORD e_cs;                /* Initial (relative) CS value */
    WORD e_lfarlc;            /* File address of relocation table */
    WORD e_ovno;        /* Overlay number */
    WORD e_res[4];            /* Reserved words */
    WORD e_oemid;       /* OEM identifier (for e_oeminfo) */
    WORD e_oeminfo;           /* OEM information; e_oemid specific */
    WORD e_res2[10];          /* Reserved words */
    DWORD e_lfanew;           /* File address of new exe header */
    BYTE e_code[0x40];

} IMAGE_DOS_HEADER, *PIMAGE_DOS_HEADER;

#define IMAGE_NT_SIGNATURE  0x00004550    /* PE00 */
#define SIZE_OF_NT_SIGNATURE 4

typedef struct _IMAGE_FILE_HEADER {
    WORD Machine;
    WORD NumberOfSections;
    DWORD TimeDateStamp;
    DWORD PointerToSymbolTable;
    DWORD NumberOfSymbols;
    WORD SizeOfOptionalHeader;
    WORD Characteristics;
} IMAGE_FILE_HEADER, *PIMAGE_FILE_HEADER;


#define IMAGE_SIZEOF_FILE_HEADER 20

typedef struct _IMAGE_DATA_DIRECTORY {
    DWORD VirtualAddress;
    DWORD Size;
} IMAGE_DATA_DIRECTORY, *PIMAGE_DATA_DIRECTORY;


typedef struct _IMAGE_OPTIONAL_HEADER {
    /* Standard fields. */
    WORD Magic;
    BYTE MajorLinkerVersion;
    BYTE MinorLinkerVersion;
    DWORD SizeOfCode;
    DWORD SizeOfInitializedData;
    DWORD SizeOfUninitializedData;
    DWORD AddressOfEntryPoint;
    DWORD BaseOfCode;
    DWORD BaseOfData;

    /* NT additional fields. */
    DWORD ImageBase;
    DWORD SectionAlignment;
    DWORD FileAlignment;
    WORD MajorOperatingSystemVersion;
    WORD MinorOperatingSystemVersion;
    WORD MajorImageVersion;
    WORD MinorImageVersion;
    WORD MajorSubsystemVersion;
    WORD MinorSubsystemVersion;
    DWORD Win32VersionValue;
    DWORD SizeOfImage;
    DWORD SizeOfHeaders;
    DWORD CheckSum;
    WORD Subsystem;
    WORD DllCharacteristics;
    DWORD SizeOfStackReserve;
    DWORD SizeOfStackCommit;
    DWORD SizeOfHeapReserve;
    DWORD SizeOfHeapCommit;
    DWORD LoaderFlags;
    DWORD NumberOfRvaAndSizes;
    IMAGE_DATA_DIRECTORY DataDirectory[16];

} IMAGE_OPTIONAL_HEADER32, *PIMAGE_OPTIONAL_HEADER32;


#define IMAGE_DIRECTORY_ENTRY_EXPORT          0 /* Export Directory */
#define IMAGE_DIRECTORY_ENTRY_IMPORT          1 /* Import Directory */
#define IMAGE_DIRECTORY_ENTRY_RESOURCE        2 /* Resource Directory */
#define IMAGE_DIRECTORY_ENTRY_EXCEPTION       3 /* Exception Directory */
#define IMAGE_DIRECTORY_ENTRY_SECURITY        4 /* Security Directory */
#define IMAGE_DIRECTORY_ENTRY_BASERELOC       5 /* Base Relocation Table */
#define IMAGE_DIRECTORY_ENTRY_DEBUG           6 /* Debug Directory */
/*      IMAGE_DIRECTORY_ENTRY_COPYRIGHT       7      (X86 usage) */
#define IMAGE_DIRECTORY_ENTRY_ARCHITECTURE    7 /* Architecture Specific Data */
#define IMAGE_DIRECTORY_ENTRY_GLOBALPTR       8 /* RVA of GP */
#define IMAGE_DIRECTORY_ENTRY_TLS             9 /* TLS Directory */
#define IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG    10 /* Load Configuration Directory */
#define IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT   11 /* Bound Import Directory in headers */
#define IMAGE_DIRECTORY_ENTRY_IAT            12 /* Import Address Table */
#define IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT   13 /* Delay Load Import Descriptors */
#define IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR 14 /* COM Runtime descriptor */

/* Section header format. */
#define IMAGE_SIZEOF_SHORT_NAME              8

typedef struct _IMAGE_SECTION_HEADER {
    BYTE Name[IMAGE_SIZEOF_SHORT_NAME];
    union {
      DWORD PhysicalAddress;
      DWORD VirtualSize;
    } Misc;
    DWORD VirtualAddress;
    DWORD SizeOfRawData;
    DWORD PointerToRawData;
    DWORD PointerToRelocations;
    DWORD PointerToLinenumbers;
    WORD NumberOfRelocations;
    WORD NumberOfLinenumbers;
    DWORD Characteristics;
} IMAGE_SECTION_HEADER, *PIMAGE_SECTION_HEADER;

#define IMAGE_SIZEOF_SECTION_HEADER          40

/* ----------------------------------------------------------- */
typedef struct _IMAGE_BASE_RELOCATION {
    DWORD VirtualAddress;
    DWORD SizeOfBlock;
//  WORD    TypeOffset[1];
} IMAGE_BASE_RELOCATION;

#define IMAGE_SIZEOF_BASE_RELOCATION         8

#define IMAGE_REL_BASED_ABSOLUTE              0
#define IMAGE_REL_BASED_HIGH                  1
#define IMAGE_REL_BASED_LOW                   2
#define IMAGE_REL_BASED_HIGHLOW               3
#define IMAGE_REL_BASED_HIGHADJ               4
#define IMAGE_REL_BASED_MIPS_JMPADDR          5
#define IMAGE_REL_BASED_SECTION               6
#define IMAGE_REL_BASED_REL32                 7

/* ----------------------------------------------------------- */

/* ----------------------------------------------------------- */
IMAGE_DOS_HEADER pe_dos_hdr = {
    0x5A4D,             /*WORD e_magic;         Magic number */
    0x0090,             /*WORD e_cblp;          Bytes on last page of file */
    0x0003,             /*WORD e_cp;            Pages in file */
    0x0000,             /*WORD e_crlc;          Relocations */

    0x0004,             /*WORD e_cparhdr;       Size of header in paragraphs */
    0x0000,             /*WORD e_minalloc;      Minimum extra paragraphs needed */
    0xFFFF,             /*WORD e_maxalloc;      Maximum extra paragraphs needed */
    0x0000,             /*WORD e_ss;            Initial (relative) SS value */

    0x00B8,             /*WORD e_sp;            Initial SP value */
    0x0000,             /*WORD e_csum;          Checksum */
    0x0000,             /*WORD e_ip;            Initial IP value */
    0x0000,             /*WORD e_cs;            Initial (relative) CS value */
    0x0040,             /*WORD e_lfarlc;        File address of relocation table */
    0x0000,             /*WORD e_ovno;          Overlay number */
    {0, 0, 0, 0},       /*WORD e_res[4];     Reserved words */
    0x0000,             /*WORD e_oemid;         OEM identifier (for e_oeminfo) */
    0x0000,             /*WORD e_oeminfo;       OEM information; e_oemid specific */
    {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, /*WORD e_res2[10];      Reserved words */
    0x00000080,               /*DWORD   e_lfanew;        File address of new exe header */
    {                   /* 14 code bytes + "This program cannot be run in DOS mode.\r\r\n$" + 6 * 0x00 */
     /*0040 */ 0x0e, 0x1f, 0xba, 0x0e, 0x00, 0xb4, 0x09, 0xcd, 0x21, 0xb8,
     0x01, 0x4c, 0xcd, 0x21, 0x54, 0x68,
     /*0050 */ 0x69, 0x73, 0x20, 0x70, 0x72, 0x6f, 0x67, 0x72, 0x61, 0x6d,
     0x20, 0x63, 0x61, 0x6e, 0x6e, 0x6f,
     /*0060 */ 0x74, 0x20, 0x62, 0x65, 0x20, 0x72, 0x75, 0x6e, 0x20, 0x69,
     0x6e, 0x20, 0x44, 0x4f, 0x53, 0x20,
     /*0070 */ 0x6d, 0x6f, 0x64, 0x65, 0x2e, 0x0d, 0x0d, 0x0a, 0x24, 0x00,
     0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     /*0080 */
     }
};

DWORD pe_magic = IMAGE_NT_SIGNATURE;

IMAGE_FILE_HEADER pe_file_hdr = {
    0x014C,             /*WORD    Machine; */
    0x0003,             /*WORD    NumberOfSections; */
    0x00000000,               /*DWORD   TimeDateStamp; */
    0x00000000,               /*DWORD   PointerToSymbolTable; */
    0x00000000,               /*DWORD   NumberOfSymbols; */
    0x00E0,             /*WORD    SizeOfOptionalHeader; */
    0x030F              /*WORD    Characteristics; */
};

IMAGE_OPTIONAL_HEADER32 pe_opt_hdr = {
    /* Standard fields. */
    0x010B,             /*WORD    Magic; */
    0x06,               /*BYTE    MajorLinkerVersion; */
    0x00,               /*BYTE    MinorLinkerVersion; */
    0x00000000,               /*DWORD   SizeOfCode; */
    0x00000000,               /*DWORD   SizeOfInitializedData; */
    0x00000000,               /*DWORD   SizeOfUninitializedData; */
    0x00000000,               /*DWORD   AddressOfEntryPoint; */
    0x00000000,               /*DWORD   BaseOfCode; */
    0x00000000,               /*DWORD   BaseOfData; */

    /* NT additional fields. */
    0x00400000,               /*DWORD   ImageBase; */
    0x00001000,               /*DWORD   SectionAlignment; */
    0x00000200,               /*DWORD   FileAlignment; */
    0x0004,             /*WORD    MajorOperatingSystemVersion; */
    0x0000,             /*WORD    MinorOperatingSystemVersion; */
    0x0000,             /*WORD    MajorImageVersion; */
    0x0000,             /*WORD    MinorImageVersion; */
    0x0004,             /*WORD    MajorSubsystemVersion; */
    0x0000,             /*WORD    MinorSubsystemVersion; */
    0x00000000,               /*DWORD   Win32VersionValue; */
    0x00000000,               /*DWORD   SizeOfImage; */
    0x00000200,               /*DWORD   SizeOfHeaders; */
    0x00000000,               /*DWORD   CheckSum; */
    0x0002,             /*WORD    Subsystem; */
    0x0000,             /*WORD    DllCharacteristics; */
    0x00100000,               /*DWORD   SizeOfStackReserve; */
    0x00001000,               /*DWORD   SizeOfStackCommit; */
    0x00100000,               /*DWORD   SizeOfHeapReserve; */
    0x00001000,               /*DWORD   SizeOfHeapCommit; */
    0x00000000,               /*DWORD   LoaderFlags; */
    0x00000010,               /*DWORD   NumberOfRvaAndSizes; */

    /* IMAGE_DATA_DIRECTORY DataDirectory[16]; */
    {{0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0},
     {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}, {0, 0}}
};

/*----------------------------------------------------------------------------*/

/*----------------------------------------------------------------------------*/

struct pe_import_header {
    DWORD first_entry;
    DWORD time_date;
    DWORD forwarder;
    DWORD lib_name_offset;
    DWORD first_thunk;
};

struct pe_export_header {
    DWORD Characteristics;
    DWORD TimeDateStamp;
    DWORD Version;
    DWORD Name;
    DWORD Base;
    DWORD NumberOfFunctions;
    DWORD NumberOfNames;
    DWORD AddressOfFunctions;
    DWORD AddressOfNames;
    DWORD AddressOfNameOrdinals;
};

struct pe_reloc_header {
    DWORD offset;
    DWORD size;
};

/* ------------------------------------------------------------- */
/* internal temporary structures */

ST const char *pe_sec_names[] = {
    ".text",
    ".data",
    ".bss",
    ".rsrc",
    ".reloc",
    ".stab",
    ".stabstr"
};

enum {
    sec_text = 0,
    sec_data,
    sec_bss,
    sec_rsrc,
    sec_reloc,
    sec_stab,
    sec_stabstr,
    pe_sec_number
};

ST DWORD pe_flags[] = {
    0x60000020,               /* ".text", */
    0xC0000040,               /* ".data", */
    0xC0000080,               /* ".bss", */
    0x40000040,               /* ".rsrc", */
    0x42000040,               /* ".reloc", */
    0x42000802,               /* ".stab", */
    0x42000802                /* ".stabstr", */
};

struct section_info {
    struct section_info *next;
    int id;
    DWORD sh_addr;
    DWORD sh_size;
    unsigned char *data;
    DWORD data_size;
};

struct import_symbol {
    int sym_index;
    int offset;
};

struct pe_import_info {
    int dll_index;
    int sym_count;
    struct import_symbol **symbols;
};

struct pe_info {
    const char *filename;
    DWORD sizeofheaders;
    DWORD imagebase;
    DWORD start_addr;
    DWORD imp_offs;
    DWORD imp_size;
    DWORD iat_offs;
    DWORD iat_size;
    DWORD exp_offs;
    DWORD exp_size;
    struct section_info sh_info[pe_sec_number];
    int sec_count;
    struct pe_import_info **imp_info;
    int imp_count;
    Section *reloc;
    Section *thunk;
    TCCState *s1;
};

/* ------------------------------------------------------------- */
#define PE_MERGE_DATA
// #define PE_PRINT_SECTIONS

#ifndef MAX_PATH
#define MAX_PATH 260
#endif

void error_noabort(const char *, ...);

ST char pe_type;

#define PE_NUL 0
#define PE_DLL 1
#define PE_GUI 2
#define PE_EXE 3

ST int pe_find_import(TCCState * s1, const char *symbol, char *ret)
{
    int sym_index = find_elf_sym(s1->dynsymtab_section, symbol);
    if (0 == sym_index) {
      /* Hm, maybe it's '_symbol' instead of 'symbol' or '__imp__symbol' */
      char buffer[100];
      if (0 == memcmp(symbol, "__imp__", 7))
          symbol += 6;
      else
          buffer[0] = '_', strcpy(buffer + 1, symbol), symbol = buffer;
      sym_index = find_elf_sym(s1->dynsymtab_section, symbol);
    }
    if (ret)
      strcpy(ret, symbol);
    return sym_index;
}

#ifdef WIN32
ST void **pe_imp;
ST int nb_pe_imp;

void *resolve_sym(struct TCCState *s1, const char *symbol, int type)
{
    char buffer[100], *p = buffer;
    void *a = NULL;
    int sym_index = pe_find_import(s1, symbol, p);
    int dll_index;
    const char *dll_name;
    void *hm;

    if (sym_index) {
      dll_index = ((Elf32_Sym *) s1->dynsymtab_section->data)[sym_index].
          st_other;
        dll_name = s1->loaded_dlls[dll_index]->name;
      hm = GetModuleHandleA(dll_name);
        if (NULL == hm)
            hm = LoadLibraryA(dll_name);
        if (hm) {
            a = GetProcAddress(hm, buffer);
            if (a && STT_OBJECT == type) {
                // need to return a pointer to the address for data objects
                dynarray_add(&pe_imp, &nb_pe_imp, a);
                a = &pe_imp[nb_pe_imp - 1];
            }
        }
    }
    return a;
}
#endif

#define for_sym_in_symtab(sym) \
for (sym = (Elf32_Sym *)symtab_section->data + 1; \
       sym < (Elf32_Sym *)(symtab_section->data + \
            symtab_section->data_offset); \
       ++sym)

#define pe_set_datadir(dir,addr,size) \
      pe_opt_hdr.DataDirectory[dir].VirtualAddress = addr, \
      pe_opt_hdr.DataDirectory[dir].Size = size

/*----------------------------------------------------------------------------*/
ST void dynarray_reset(void ***pp, int *n)
{
    int i;
    for (i = 0; i < *n; ++i)
      tcc_free((*pp)[i]);
    tcc_free(*pp);
    *pp = NULL;
    *n = 0;
}

ST int dynarray_assoc(void **pp, int n, int key)
{
    int i;
    for (i = 0; i < n; ++i, ++pp)
      if (key == **(int **) pp)
          return i;
    return -1;
}

#if 0
ST DWORD umin(DWORD a, DWORD b)
{
    return a < b ? a : b;
}
#endif

ST DWORD umax(DWORD a, DWORD b)
{
    return a < b ? b : a;
}

ST void pe_fpad(FILE * fp, DWORD new_pos)
{
    DWORD pos = ftell(fp);
    while (++pos <= new_pos)
      fputc(0, fp);
}

ST DWORD pe_file_align(DWORD n)
{
    return (n + (0x200 - 1)) & ~(0x200 - 1);
}

ST DWORD pe_virtual_align(DWORD n)
{
    return (n + (0x1000 - 1)) & ~(0x1000 - 1);
}

ST void pe_align_section(Section * s, int a)
{
    int i = s->data_offset & (a - 1);
    if (i)
      section_ptr_add(s, a - i);
}


/*----------------------------------------------------------------------------*/
ST int pe_write_pe(struct pe_info *pe)
{
    int i;
    FILE *op;
    DWORD file_offset;
    IMAGE_SECTION_HEADER ish[pe_sec_number], *psh;
    int sec_index = 0;

    op = fopen(pe->filename, "wb");
    if (NULL == op) {
      error_noabort("could not create file: %s", pe->filename);
      return 1;
    }

    memset(&ish, 0, sizeof ish);

    pe->sizeofheaders = pe_file_align(sizeof pe_dos_hdr
                              + sizeof pe_magic
                              + sizeof pe_file_hdr
                              + sizeof pe_opt_hdr
                              +
                              pe->sec_count *
                              sizeof(IMAGE_SECTION_HEADER)
      );

    file_offset = pe->sizeofheaders;
    pe_fpad(op, file_offset);

    if (2 == verbose)
      printf("-------------------------------"
             "\n  virt   file   size  section" "\n");

    for (i = 0; i < pe->sec_count; ++i) {
      struct section_info *si = pe->sh_info + i;
      const char *sh_name = pe_sec_names[si->id];
      unsigned long addr = si->sh_addr - pe->imagebase;
      unsigned long size = si->sh_size;

      if (2 == verbose)
          printf("%6lx %6lx %6lx  %s\n",
               addr, file_offset, size, sh_name);

      switch (si->id) {
      case sec_text:
          pe_opt_hdr.BaseOfCode = addr;
          pe_opt_hdr.AddressOfEntryPoint = addr + pe->start_addr;
          break;

      case sec_data:
          pe_opt_hdr.BaseOfData = addr;
          if (pe->imp_size) {
            pe_set_datadir(IMAGE_DIRECTORY_ENTRY_IMPORT,
                         pe->imp_offs + addr, pe->imp_size);
            pe_set_datadir(IMAGE_DIRECTORY_ENTRY_IAT,
                         pe->iat_offs + addr, pe->iat_size);
          }
          if (pe->exp_size) {
            pe_set_datadir(IMAGE_DIRECTORY_ENTRY_EXPORT,
                         pe->exp_offs + addr, pe->exp_size);
          }
          break;

      case sec_bss:
          break;

      case sec_reloc:
          pe_set_datadir(IMAGE_DIRECTORY_ENTRY_BASERELOC, addr, size);
          break;

      case sec_rsrc:
          pe_set_datadir(IMAGE_DIRECTORY_ENTRY_RESOURCE, addr, size);
          break;

      case sec_stab:
          break;

      case sec_stabstr:
          break;
      }

      psh = &ish[sec_index++];
      strcpy((char *) psh->Name, sh_name);

      psh->Characteristics = pe_flags[si->id];
      psh->VirtualAddress = addr;
      psh->Misc.VirtualSize = size;
      pe_opt_hdr.SizeOfImage =
          umax(psh->VirtualAddress + psh->Misc.VirtualSize,
             pe_opt_hdr.SizeOfImage);

      if (si->data_size) {
          psh->PointerToRawData = file_offset;
          fwrite(si->data, 1, si->data_size, op);
          file_offset = pe_file_align(file_offset + si->data_size);
          psh->SizeOfRawData = file_offset - psh->PointerToRawData;
          pe_fpad(op, file_offset);
      }
    }

      /*----------------------------------------------------- */

    pe_file_hdr.NumberOfSections = sec_index;
    pe_opt_hdr.SizeOfHeaders = pe->sizeofheaders;
    pe_opt_hdr.ImageBase = pe->imagebase;
    if (PE_DLL == pe_type)
      pe_file_hdr.Characteristics = 0x230E;
    else if (PE_GUI != pe_type)
      pe_opt_hdr.Subsystem = 3;

    fseek(op, SEEK_SET, 0);
    fwrite(&pe_dos_hdr, 1, sizeof pe_dos_hdr, op);
    fwrite(&pe_magic, 1, sizeof pe_magic, op);
    fwrite(&pe_file_hdr, 1, sizeof pe_file_hdr, op);
    fwrite(&pe_opt_hdr, 1, sizeof pe_opt_hdr, op);
    for (i = 0; i < sec_index; ++i)
      fwrite(&ish[i], 1, sizeof(IMAGE_SECTION_HEADER), op);
    fclose(op);

    if (2 == verbose)
      printf("-------------------------------\n");
    if (verbose)
      printf("<-- %s (%lu bytes)\n", pe->filename, file_offset);

    return 0;
}

/*----------------------------------------------------------------------------*/
ST int pe_add_import(struct pe_info *pe, int sym_index, DWORD offset)
{
    int i;
    int dll_index;
    struct pe_import_info *p;
    struct import_symbol *s;

    dll_index =
      ((Elf32_Sym *) pe->s1->dynsymtab_section->data)[sym_index].
      st_other;
    i = dynarray_assoc((void **) pe->imp_info, pe->imp_count, dll_index);
    if (-1 != i) {
      p = pe->imp_info[i];
      goto found_dll;
    }
    p = tcc_mallocz(sizeof *p);
    p->dll_index = dll_index;
    dynarray_add((void ***) &pe->imp_info, &pe->imp_count, p);

  found_dll:
    i = dynarray_assoc((void **) p->symbols, p->sym_count, sym_index);
    if (-1 != i)
      goto found_sym;
    s = tcc_mallocz(sizeof *s);
    s->sym_index = sym_index;
    s->offset = offset;
    dynarray_add((void ***) &p->symbols, &p->sym_count, s);

  found_sym:
    return 1;
}

/*----------------------------------------------------------------------------*/
ST void pe_build_imports(struct pe_info *pe)
{
    int thk_ptr, ent_ptr, dll_ptr, sym_cnt, i;
    DWORD voffset = pe->thunk->sh_addr - pe->imagebase;
    int ndlls = pe->imp_count;

    for (sym_cnt = i = 0; i < ndlls; ++i)
      sym_cnt += pe->imp_info[i]->sym_count;

    if (0 == sym_cnt)
      return;

    pe_align_section(pe->thunk, 16);

    pe->imp_offs = dll_ptr = pe->thunk->data_offset;
    pe->imp_size = (ndlls + 1) * sizeof(struct pe_import_header);
    pe->iat_offs = dll_ptr + pe->imp_size;
    pe->iat_size = (sym_cnt + ndlls) * sizeof(DWORD);
    section_ptr_add(pe->thunk, pe->imp_size + 2 * pe->iat_size);

    thk_ptr = pe->iat_offs;
    ent_ptr = pe->iat_offs + pe->iat_size;
    for (i = 0; i < pe->imp_count; ++i) {
      struct pe_import_header *hdr;
      int k, n, v;
      struct pe_import_info *p = pe->imp_info[i];
      const char *name = pe->s1->loaded_dlls[p->dll_index]->name;

      /* put the dll name into the import header */
      if (0 == strncmp(name, "lib", 3))
          name += 3;
      v = put_elf_str(pe->thunk, name);

      hdr = (struct pe_import_header *) (pe->thunk->data + dll_ptr);
      hdr->first_thunk = thk_ptr + voffset;
      hdr->first_entry = ent_ptr + voffset;
      hdr->lib_name_offset = v + voffset;

      for (k = 0, n = p->sym_count; k <= n; ++k) {
          if (k < n) {
            DWORD offset = p->symbols[k]->offset;
            int sym_index = p->symbols[k]->sym_index;
            Elf32_Sym *sym =
                (Elf32_Sym *) pe->s1->dynsymtab_section->data +
                sym_index;
            const char *name =
                pe->s1->dynsymtab_section->link->data + sym->st_name;

            if (offset & 0x80000000) {    /* ref to data */
                Elf32_Sym *sym =
                  &((Elf32_Sym *) symtab_section->
                    data)[offset & 0x7FFFFFFF];
                sym->st_value = thk_ptr;
                sym->st_shndx = pe->thunk->sh_num;
            } else {    /* ref to function */

                char buffer[100];
                sprintf(buffer, "IAT.%s", name);
                sym_index =
                  put_elf_sym(symtab_section, thk_ptr, sizeof(DWORD),
                            ELF32_ST_INFO(STB_GLOBAL, STT_OBJECT),
                            0, pe->thunk->sh_num, buffer);

                put_elf_reloc(symtab_section, text_section, offset, R_386_32, /*R_JMP_SLOT, */
                          sym_index);
            }
            v = pe->thunk->data_offset + voffset;
            section_ptr_add(pe->thunk, sizeof(WORD)); /* hint, not used */
            put_elf_str(pe->thunk, name);
          } else {
            v = 0;            // last entry is zero
          }
          *(DWORD *) (pe->thunk->data + thk_ptr) =
            *(DWORD *) (pe->thunk->data + ent_ptr) = v;
          thk_ptr += sizeof(DWORD);
          ent_ptr += sizeof(DWORD);
      }
      dll_ptr += sizeof(struct pe_import_header);
      dynarray_reset((void ***) &p->symbols, &p->sym_count);
    }
    dynarray_reset((void ***) &pe->imp_info, &pe->imp_count);
}

/* ------------------------------------------------------------- */
ST int sym_cmp(const void *va, const void *vb)
{
    Elf32_Sym *sa = (Elf32_Sym *)symtab_section->data + *(int*)va;
    Elf32_Sym *sb = (Elf32_Sym *)symtab_section->data + *(int*)vb;
    const char *ca = symtab_section->link->data + sa->st_name;
    const char *cb = symtab_section->link->data + sb->st_name;
    return strcmp(ca, cb);
}

ST void pe_build_exports(struct pe_info *pe)
{
    Elf32_Sym *sym;
    DWORD func_offset, voffset;
    struct pe_export_header *hdr;
    int sym_count, n, ord, *sorted;

    voffset = pe->thunk->sh_addr - pe->imagebase;
    sym_count = 0, n = 1, sorted = NULL;

    // for simplicity only functions are exported
    for_sym_in_symtab(sym)
    {
        if ((sym->st_other & 1)
            && sym->st_shndx == text_section->sh_num)
            dynarray_add((void***)&sorted, &sym_count, (void*)n);
        ++n;
    }

    if (0 == sym_count)
      return;

    qsort (sorted, sym_count, sizeof sorted[0], sym_cmp);
    pe_align_section(pe->thunk, 16);

    pe->exp_offs = pe->thunk->data_offset;
    hdr = section_ptr_add(pe->thunk,
                    sizeof(struct pe_export_header) +
                    sym_count * (2 * sizeof(DWORD) + sizeof(WORD)));

    func_offset = pe->exp_offs + sizeof(struct pe_export_header);

    hdr->Characteristics = 0;
    hdr->Base = 1;
    hdr->NumberOfFunctions = sym_count;
    hdr->NumberOfNames = sym_count;
    hdr->AddressOfFunctions = func_offset + voffset;
    hdr->AddressOfNames         = hdr->AddressOfFunctions + sym_count * sizeof(DWORD);
    hdr->AddressOfNameOrdinals  = hdr->AddressOfNames + sym_count * sizeof(DWORD);
    hdr->Name = pe->thunk->data_offset + voffset;
    put_elf_str(pe->thunk, tcc_basename(pe->filename));

    for (ord = 0; ord < sym_count; ++ord)
    {
        char *name; DWORD *p, *pfunc, *pname; WORD *pord;
        sym = (Elf32_Sym *)symtab_section->data + sorted[ord];
        name = symtab_section->link->data + sym->st_name;
        p = (DWORD*)(pe->thunk->data + func_offset);
        pfunc = p + ord;
        pname = p + sym_count + ord;
        pord = (WORD *)(p + 2*sym_count) + ord;
        *pfunc = sym->st_value + pe->s1->sections[sym->st_shndx]->sh_addr - pe->imagebase;
      *pname = pe->thunk->data_offset + voffset;
        *pord  = ord;
      put_elf_str(pe->thunk, name);
      /* printf("export: %s\n", name); */
    }
    pe->exp_size = pe->thunk->data_offset - pe->exp_offs;
    tcc_free(sorted);
}

/* ------------------------------------------------------------- */
ST void pe_build_reloc(struct pe_info *pe, int *section_order,
                   int section_count)
{
    DWORD offset, block_ptr, addr;
    int count, i;
    Elf32_Rel *rel, *rel_end;
    Section *s = NULL, *sr;
    offset = addr = block_ptr = count = i = 0;
    rel = rel_end = NULL;
    for (;;) {
      if (rel < rel_end) {
          int type = ELF32_R_TYPE(rel->r_info);
          addr = rel->r_offset + s->sh_addr;
          ++rel;
          if (type != R_386_32)
            continue;
          if (count == 0) {   /* new block */
            block_ptr = pe->reloc->data_offset;
            section_ptr_add(pe->reloc, sizeof(struct pe_reloc_header));
            offset = addr & 0xFFFFFFFF << 12;
          }
          if ((addr -= offset) < (1 << 12)) {   /* one block spans 4k addresses */
            WORD *wp = section_ptr_add(pe->reloc, sizeof(WORD));
            *wp = addr | IMAGE_REL_BASED_HIGHLOW << 12;
            ++count;
            continue;
          }
          --rel;
      } else if (i < section_count) {
          sr = (s = pe->s1->sections[section_order[i++]])->reloc;
          if (sr) {
            rel = (Elf32_Rel *) sr->data;
            rel_end = (Elf32_Rel *) (sr->data + sr->data_offset);
          }
          continue;
      }

      if (count) {            /* store the last block and ready for a new one */
          struct pe_reloc_header *hdr;
          if (count & 1)
            section_ptr_add(pe->reloc, 2), ++count;
          hdr = (struct pe_reloc_header *) (pe->reloc->data + block_ptr);
          hdr->offset = offset - pe->imagebase;
          hdr->size =
            count * sizeof(WORD) + sizeof(struct pe_reloc_header);
          count = 0;
      }
      if (rel >= rel_end)
          break;
    }
}

/* ------------------------------------------------------------- */
ST int pe_assign_addresses(struct pe_info *pe)
{
    int i, k, n;
    DWORD addr;
    int section_order[pe_sec_number];
    struct section_info *si_data = NULL;

    pe->imagebase = PE_DLL == pe_type ? 0x10000000 : 0x00400000;
    addr = pe->imagebase + 1;

    if (PE_DLL == pe_type)
      pe->reloc = new_section(pe->s1, ".reloc", SHT_DYNAMIC, SHF_ALLOC);

    for (n = k = 0; n < pe_sec_number; ++n) {
      for (i = 1; i < pe->s1->nb_sections; ++i) {
          Section *s = pe->s1->sections[i];
          if (0 == strcmp(s->name, pe_sec_names[n])) {
            struct section_info *si = &pe->sh_info[pe->sec_count];
#ifdef PE_MERGE_DATA
            if (n == sec_bss && si_data) {
                /* append .bss to .data */
                s->sh_addr = addr = ((addr - 1) | 15) + 1;
                addr += s->data_offset;
                si_data->sh_size = addr - si_data->sh_addr;
            } else
#endif
            {
                si->sh_addr = s->sh_addr = addr =
                  pe_virtual_align(addr);
                si->id = n;

                if (n == sec_data) {
                  pe->thunk = s;
                  si_data = si;
                  pe_build_imports(pe);
                  pe_build_exports(pe);
                } else if (n == sec_reloc) {
                  pe_build_reloc(pe, section_order, k);
                }

                if (s->data_offset) {
                  if (n != sec_bss) {
                      si->data = s->data;
                      si->data_size = s->data_offset;
                  }

                  addr += s->data_offset;
                  si->sh_size = s->data_offset;
                  ++pe->sec_count;
                }
                //printf("Section %08X %04X %s\n", si->sh_addr, si->data_size, s->name);
            }
            section_order[k] = i, ++k;
          }
      }
    }
    return 0;
}

/*----------------------------------------------------------------------------*/
ST int pe_check_symbols(struct pe_info *pe)
{
    Elf32_Sym *sym;
    int ret = 0;

    pe_align_section(text_section, 8);

    for_sym_in_symtab(sym) {
      if (sym->st_shndx == SHN_UNDEF) {
          const char *symbol = symtab_section->link->data + sym->st_name;
          unsigned type = ELF32_ST_TYPE(sym->st_info);
          int sym_index = pe_find_import(pe->s1, symbol, NULL);
          if (sym_index) {
            if (type == STT_FUNC) {
                unsigned long offset = text_section->data_offset;
                if (pe_add_import(pe, sym_index, offset + 2)) {
                  /* add the 'jmp IAT[x]' instruction */
                  *(WORD *) section_ptr_add(text_section, 8) =
                      0x25FF;
                  /* patch the symbol */
                  sym->st_shndx = text_section->sh_num;
                  sym->st_value = offset;
                  continue;
                }
            } else if (type == STT_OBJECT) {    /* data, ptr to that should be */
                if (pe_add_import(pe, sym_index,
                              (sym -
                              (Elf32_Sym *) symtab_section->data) | 
                                      0x80000000))
                  continue;
            }
          }
          error_noabort("undefined symbol '%s'", symbol);
          ret = 1;
      } else
          if (pe->s1->rdynamic
            && ELF32_ST_BIND(sym->st_info) != STB_LOCAL) {
          /* if -rdynamic option, then export all non local symbols */
          sym->st_other |= 1;
      }
    }
    return ret;
}

/*----------------------------------------------------------------------------*/
#ifdef PE_PRINT_SECTIONS
ST void pe_print_section(FILE * f, Section * s)
{                       /* just if you'r curious */
    BYTE *p, *e, b;
    int i, n, l, m;
    p = s->data;
    e = s->data + s->data_offset;
    l = e - p;

    fprintf(f, "section  \"%s\"", s->name);
    if (s->link)
      fprintf(f, "\nlink     \"%s\"", s->link->name);
    if (s->reloc)
      fprintf(f, "\nreloc    \"%s\"", s->reloc->name);
    fprintf(f, "\nv_addr   %08X", s->sh_addr);
    fprintf(f, "\ncontents %08X", l);
    fprintf(f, "\n\n");

    if (s->sh_type == SHT_NOBITS)
      return;

    if (s->sh_type == SHT_SYMTAB)
      m = sizeof(Elf32_Sym);
    if (s->sh_type == SHT_REL)
      m = sizeof(Elf32_Rel);
    else
      m = 16;

    for (i = 0; i < l;) {
      fprintf(f, "%08X", i);
      for (n = 0; n < m; ++n) {
          if (n + i < l)
            fprintf(f, " %02X", p[i + n]);
          else
            fprintf(f, "   ");
      }

      if (s->sh_type == SHT_SYMTAB) {
          Elf32_Sym *sym = (Elf32_Sym *) (p + i);
          const char *name = s->link->data + sym->st_name;
          fprintf(f,
                "  name:%04X"
                "  value:%04X"
                "  size:%04X"
                "  bind:%02X"
                "  type:%02X"
                "  other:%02X"
                "  shndx:%04X"
                "  \"%s\"",
                sym->st_name,
                sym->st_value,
                sym->st_size,
                ELF32_ST_BIND(sym->st_info),
                ELF32_ST_TYPE(sym->st_info),
                sym->st_other, sym->st_shndx, name);
      } else if (s->sh_type == SHT_REL) {
          Elf32_Rel *rel = (Elf32_Rel *) (p + i);
          Elf32_Sym *sym =
            (Elf32_Sym *) s->link->data + ELF32_R_SYM(rel->r_info);
          const char *name = s->link->link->data + sym->st_name;
          fprintf(f,
                "  offset:%04X"
                "  type:%02X"
                "  symbol:%04X"
                "  \"%s\"",
                rel->r_offset,
                ELF32_R_TYPE(rel->r_info),
                ELF32_R_SYM(rel->r_info), name);
      } else {
          fprintf(f, "   ");
          for (n = 0; n < m; ++n) {
            if (n + i < l) {
                b = p[i + n];
                if (b < 32 || b >= 127)
                  b = '.';
                fprintf(f, "%c", b);
            }
          }
      }
      i += m;
      fprintf(f, "\n");
    }
    fprintf(f, "\n\n");
}
#endif

static int pe_test_cmd(const char **pp, const char *cmd)
{
    const char *p;
    char *q, buf[16];
    int ret;

    p = *pp;
    q = buf;
    while (*p != '\0' && !is_space(*p)) {
        if ((q - buf) < sizeof(buf) - 1)
            *q++ = toup(*p);
        p++;
    }
    *q = '\0';
    ret = !strcmp(buf, cmd);
    *pp = p;
    return ret;
}

/* ------------------------------------------------------------- */
int pe_load_def_file(TCCState * s1, FILE * fp)
{
    DLLReference *dllref;
    int f = 0, sym_index;
    char *p, line[120], dllname[40];
    while (fgets(line, sizeof line, fp)) {
      p = strchr(line, 0);
      while (p > line && p[-1] <= ' ')
          --p;
      *p = 0;
      p = line;
      while (*p && *p <= ' ')
          ++p;

      if (*p && ';' != *p)
          switch (f) {
          case 0:
                if (!pe_test_cmd((const char **)&p, "LIBRARY"))
                return -1;
                while (is_space(*p))
                    p++;
            pstrcpy(dllname, sizeof(dllname), p);
            ++f;
            continue;

          case 1:
                if (!pe_test_cmd((const char **)&p, "EXPORTS"))
                return -1;
            ++f;
            continue;

          case 2:
            dllref =
                tcc_malloc(sizeof(DLLReference) + strlen(dllname));
            strcpy(dllref->name, dllname);
            dllref->level = 0;
            dynarray_add((void ***) &s1->loaded_dlls,
                       &s1->nb_loaded_dlls, dllref);
            ++f;

          default:
            /* tccpe needs to know from what dll it should import
                   the sym */
            sym_index = add_elf_sym(s1->dynsymtab_section,
                              0, 0, ELF32_ST_INFO(STB_GLOBAL,
                                              STT_FUNC),
                                        s1->nb_loaded_dlls - 1,
                              text_section->sh_num, p);
            continue;
          }
    }
    return 0;
}

/* ------------------------------------------------------------- */
void pe_guess_outfile(char *objfilename, int output_type)
{
    char *ext = strrchr(objfilename, '.');
    if (NULL == ext)
        ext = strchr(objfilename, 0);
    if (output_type == TCC_OUTPUT_DLL)
        strcpy(ext, ".dll");
    else
    if (output_type == TCC_OUTPUT_EXE)
        strcpy(ext, ".exe");
    else
    if (output_type == TCC_OUTPUT_OBJ && strcmp(ext, ".o"))
        strcpy(ext, ".o");
    else
        error("no outputfile given");
}

/* ------------------------------------------------------------- */
unsigned long pe_add_runtime(TCCState * s1)
{
    const char *start_symbol;
    unsigned long addr;

    if (find_elf_sym(symtab_section, "WinMain"))
      pe_type = PE_GUI;
    else
    if (TCC_OUTPUT_DLL == s1->output_type)
    {
        pe_type = PE_DLL;
        // need this for 'tccelf.c:relocate_section()'
        s1->output_type = TCC_OUTPUT_EXE;
    }

    start_symbol =
      TCC_OUTPUT_MEMORY == s1->output_type
      ? PE_GUI == pe_type ? "_runwinmain" : NULL
      : PE_DLL == pe_type ? "_dllstart"
      : PE_GUI == pe_type ? "_winstart" : "_start";

    /* grab the startup code from libtcc1 */
    if (start_symbol)
      add_elf_sym(symtab_section,
                0, 0,
                ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0,
                SHN_UNDEF, start_symbol);

    if (0 == s1->nostdlib) {
      tcc_add_library(s1, "tcc1");
      tcc_add_library(s1, "msvcrt");
      if (PE_DLL == pe_type || PE_GUI == pe_type) {
          tcc_add_library(s1, "kernel32");
          tcc_add_library(s1, "user32");
          tcc_add_library(s1, "gdi32");
      }
    }

    addr = start_symbol ?
      (unsigned long) tcc_get_symbol_err(s1, start_symbol) : 0;

    if (s1->output_type == TCC_OUTPUT_MEMORY && addr) {
      /* for -run GUI's, put '_runwinmain' instead of 'main' */
      add_elf_sym(symtab_section,
                addr, 0,
                ELF32_ST_INFO(STB_GLOBAL, STT_NOTYPE), 0,
                text_section->sh_num, "main");

      /* FreeConsole(); */
    }
    return addr;
}

int tcc_output_pe(TCCState * s1, const char *filename)
{
    int ret;
    struct pe_info pe;
    int i;
    memset(&pe, 0, sizeof pe);
    pe.filename = filename;
    pe.s1 = s1;
    pe.start_addr = pe_add_runtime(s1);

    relocate_common_syms();   /* assign bss adresses */
    ret = pe_check_symbols(&pe);
    if (0 == ret) {
      pe_assign_addresses(&pe);
      relocate_syms(s1, 0);
      for (i = 1; i < s1->nb_sections; ++i) {
          Section *s = s1->sections[i];
          if (s->reloc)
            relocate_section(s1, s);
      }
      ret = pe_write_pe(&pe);
    }
#ifdef PE_PRINT_SECTIONS
    {
      Section *s;
      FILE *f;
        f = fopen("tccpe.log", "wt");
      for (i = 1; i < s1->nb_sections; ++i) {
          s = s1->sections[i];
          pe_print_section(f, s);
      }
      pe_print_section(f, s1->dynsymtab_section);
      fclose(f);
    }
#endif
    return ret;
}

/*----------------------------------------------------------------------------*/

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