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mscoffobj.d
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mscoffobj.d
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/**
* Compiler implementation of the
* $(LINK2 http://www.dlang.org, D programming language).
*
* Copyright: Copyright (C) 2009-2019 by The D Language Foundation, All Rights Reserved
* Authors: $(LINK2 http://www.digitalmars.com, Walter Bright)
* License: $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
* Source: $(LINK2 https://github.com/dlang/dmd/blob/master/src/dmd/backend/mscoffobj.d, backend/mscoffobj.d)
*/
module dmd.backend.mscoffobj;
version (MARS)
{
import core.stdc.ctype;
import core.stdc.stdio;
import core.stdc.stdint;
import core.stdc.stdlib;
import core.stdc.string;
import core.stdc.time;
import dmd.backend.cc;
import dmd.backend.cdef;
import dmd.backend.code;
import dmd.backend.code_x86;
import dmd.backend.cv8;
import dmd.backend.dlist;
import dmd.backend.dvec;
import dmd.backend.el;
import dmd.backend.md5;
import dmd.backend.mem;
import dmd.backend.global;
import dmd.backend.obj;
import dmd.backend.outbuf;
import dmd.backend.ty;
import dmd.backend.type;
import dmd.backend.mscoff;
extern (C++):
nothrow:
alias _compare_fp_t = extern(C) nothrow int function(const void*, const void*);
extern(C) void qsort(void* base, size_t nmemb, size_t size, _compare_fp_t compar);
static if (TARGET_WINDOS)
{
extern (C) char* strupr(char*);
private __gshared Outbuffer *fobjbuf;
enum DEST_LEN = (IDMAX + IDOHD + 1);
char *obj_mangle2(Symbol *s,char *dest);
int elf_align(int size, int foffset);
/******************************************
*/
// The object file is built ib several separate pieces
__gshared private
{
// String Table - String table for all other names
Outbuffer *string_table;
// Section Headers
public Outbuffer *ScnhdrBuf; // Buffer to build section table in
// The -1 is because it is 1 based indexing
IMAGE_SECTION_HEADER* ScnhdrTab() { return cast(IMAGE_SECTION_HEADER *)ScnhdrBuf.buf - 1; }
int scnhdr_cnt; // Number of sections in table
enum SCNHDR_TAB_INITSIZE = 16; // Initial number of sections in buffer
enum SCNHDR_TAB_INC = 4; // Number of sections to increment buffer by
enum SYM_TAB_INIT = 100; // Initial number of symbol entries in buffer
enum SYM_TAB_INC = 50; // Number of symbols to increment buffer by
// The symbol table
Outbuffer *symbuf;
Outbuffer *syment_buf; // array of struct syment
segidx_t segidx_drectve = UNKNOWN; // contents of ".drectve" section
segidx_t segidx_debugS = UNKNOWN;
segidx_t segidx_xdata = UNKNOWN;
segidx_t segidx_pdata = UNKNOWN;
int jumpTableSeg; // segment index for __jump_table
Outbuffer *indirectsymbuf2; // indirect symbol table of Symbol*'s
int pointersSeg; // segment index for __pointers
Outbuffer *ptrref_buf; // buffer for pointer references
int floatused;
/* If an MsCoffObj_external_def() happens, set this to the string index,
* to be added last to the symbol table.
* Obviously, there can be only one.
*/
IDXSTR extdef;
// Each compiler segment is a section
// Predefined compiler segments CODE,DATA,CDATA,UDATA map to indexes
// into SegData[]
// New compiler segments are added to end.
/******************************
* Returns !=0 if this segment is a code segment.
*/
int seg_data_isCode(const ref seg_data sd)
{
return (ScnhdrTab[sd.SDshtidx].Characteristics & IMAGE_SCN_CNT_CODE) != 0;
}
public:
// already in cgobj.c (should be part of objmod?):
// seg_data **SegData;
extern int seg_count;
extern int seg_max;
segidx_t seg_tlsseg = UNKNOWN;
segidx_t seg_tlsseg_bss = UNKNOWN;
}
/*******************************************************
* Because the mscoff relocations cannot be computed until after
* all the segments are written out, and we need more information
* than the mscoff relocations provide, make our own relocation
* type. Later, translate to mscoff relocation structure.
*/
enum
{
RELaddr = 0, // straight address
RELrel = 1, // relative to location to be fixed up
RELseg = 2, // 2 byte section
RELaddr32 = 3, // 4 byte offset
}
struct Relocation
{ // Relocations are attached to the struct seg_data they refer to
targ_size_t offset; // location in segment to be fixed up
Symbol *funcsym; // function in which offset lies, if any
Symbol *targsym; // if !=null, then location is to be fixed up
// to address of this symbol
uint targseg; // if !=0, then location is to be fixed up
// to address of start of this segment
ubyte rtype; // RELxxxx
short val; // 0, -1, -2, -3, -4, -5
}
/*******************************
* Output a string into a string table
* Input:
* strtab = string table for entry
* str = string to add
*
* Returns offset into the specified string table.
*/
IDXSTR MsCoffObj_addstr(Outbuffer *strtab, const(char)* str)
{
//printf("MsCoffObj_addstr(strtab = %p str = '%s')\n",strtab,str);
IDXSTR idx = cast(IDXSTR)strtab.size(); // remember starting offset
strtab.writeString(str);
//printf("\tidx %d, new size %d\n",idx,strtab.size());
return idx;
}
/*******************************
* Find a string in a string table
* Input:
* strtab = string table for entry
* str = string to find
*
* Returns index into the specified string table or 0.
*/
private IDXSTR elf_findstr(Outbuffer *strtab, const(char)* str, const(char)* suffix)
{
const(char)* ent = cast(char *)strtab.buf+4;
const(char)* pend = ent+strtab.size() - 1;
const(char)* s = str;
const(char)* sx = suffix;
int len = cast(uint)strlen(str);
if (suffix)
len += strlen(suffix);
while(ent < pend)
{
if(*ent == 0) // end of table entry
{
if(*s == 0 && !sx) // end of string - found a match
{
return cast(IDXSTR)(ent - cast(const(char)*)strtab.buf - len);
}
else // table entry too short
{
s = str; // back to beginning of string
sx = suffix;
ent++; // start of next table entry
}
}
else if (*s == 0 && sx && *sx == *ent)
{ // matched first string
s = sx+1; // switch to suffix
ent++;
sx = null;
}
else // continue comparing
{
if (*ent == *s)
{ // Have a match going
ent++;
s++;
}
else // no match
{
while(*ent != 0) // skip to end of entry
ent++;
ent++; // start of next table entry
s = str; // back to beginning of string
sx = suffix;
}
}
}
return 0; // never found match
}
/*******************************
* Output a mangled string into the symbol string table
* Input:
* str = string to add
*
* Returns offset of the string in string table (offset of the string).
*/
private IDXSTR elf_addmangled(Symbol *s)
{
//printf("elf_addmangled(%s)\n", s.Sident.ptr);
char[DEST_LEN] dest = void;
IDXSTR namidx = cast(IDXSTR)string_table.size();
char *destr = obj_mangle2(s, dest.ptr);
const(char)* name = destr;
if (CPP && name[0] == '_' && name[1] == '_')
{
if (strncmp(name,"__ct__",6) == 0)
name += 4;
}
else if (tyfunc(s.ty()) && s.Sfunc && s.Sfunc.Fredirect)
name = s.Sfunc.Fredirect;
size_t len = strlen(name);
string_table.reserve(cast(uint)(len+1));
strcpy(cast(char *)string_table.p,name);
string_table.setsize(cast(uint)(namidx+len+1));
if (destr != dest.ptr) // if we resized result
mem_free(destr);
//dbg_printf("\telf_addmagled string_table %s namidx %d len %d size %d\n",name, namidx,len,string_table.size());
return namidx;
}
/**************************
* Output read only data and generate a symbol for it.
*
*/
Symbol * MsCoffObj_sym_cdata(tym_t ty,char *p,int len)
{
//printf("MsCoffObj_sym_cdata(ty = %x, p = %x, len = %d, Offset(CDATA) = %x)\n", ty, p, len, Offset(CDATA));
alignOffset(CDATA, tysize(ty));
Symbol *s = symboldata(Offset(CDATA), ty);
s.Sseg = CDATA;
MsCoffObj_pubdef(CDATA, s, Offset(CDATA));
MsCoffObj_bytes(CDATA, Offset(CDATA), len, p);
s.Sfl = FLdata; //FLextern;
return s;
}
/**************************
* Ouput read only data for data
*
*/
int MsCoffObj_data_readonly(char *p, int len, segidx_t *pseg)
{
int oldoff;
version (SCPP)
{
oldoff = Offset(DATA);
SegData[DATA].SDbuf.reserve(len);
SegData[DATA].SDbuf.writen(p,len);
Offset(DATA) += len;
*pseg = DATA;
}
else
{
oldoff = cast(int)Offset(CDATA);
SegData[CDATA].SDbuf.reserve(len);
SegData[CDATA].SDbuf.writen(p,len);
Offset(CDATA) += len;
*pseg = CDATA;
}
return oldoff;
}
int MsCoffObj_data_readonly(char *p, int len)
{
segidx_t pseg;
return MsCoffObj_data_readonly(p, len, &pseg);
}
/*****************************
* Get segment for readonly string literals.
* The linker will pool strings in this section.
* Params:
* sz = number of bytes per character (1, 2, or 4)
* Returns:
* segment index
*/
int MsCoffObj_string_literal_segment(uint sz)
{
assert(0);
}
/******************************
* Start a .obj file.
* Called before any other obj_xxx routines.
* One source file can generate multiple .obj files.
*/
Obj MsCoffObj_init(Outbuffer *objbuf, const(char)* filename, const(char)* csegname)
{
//printf("MsCoffObj_init()\n");
Obj obj = cast(Obj)mem_calloc(__traits(classInstanceSize, Obj));
cseg = CODE;
fobjbuf = objbuf;
assert(objbuf.size() == 0);
floatused = 0;
segidx_drectve = UNKNOWN;
seg_tlsseg = UNKNOWN;
seg_tlsseg_bss = UNKNOWN;
segidx_pdata = UNKNOWN;
segidx_xdata = UNKNOWN;
segidx_debugS = UNKNOWN;
// Initialize buffers
if (!string_table)
{
string_table = cast(Outbuffer*) calloc(1, Outbuffer.sizeof);
assert(string_table);
string_table.enlarge(1024);
string_table.reserve(2048);
}
string_table.setsize(0);
string_table.write32(4); // first 4 bytes are length of string table
if (symbuf)
{
Symbol **p = cast(Symbol **)symbuf.buf;
const size_t n = symbuf.size() / (Symbol *).sizeof;
for (size_t i = 0; i < n; ++i)
symbol_reset(p[i]);
symbuf.setsize(0);
}
else
{
symbuf = cast(Outbuffer*) calloc(1, Outbuffer.sizeof);
assert(symbuf);
symbuf.enlarge((Symbol *).sizeof * SYM_TAB_INIT);
}
if (!syment_buf)
{
syment_buf = cast(Outbuffer*) calloc(1, Outbuffer.sizeof);
assert(syment_buf);
syment_buf.enlarge(SymbolTable32.sizeof * SYM_TAB_INIT);
}
syment_buf.setsize(0);
extdef = 0;
pointersSeg = 0;
// Initialize segments for CODE, DATA, UDATA and CDATA
if (!ScnhdrBuf)
{
ScnhdrBuf = cast(Outbuffer*) calloc(1, Outbuffer.sizeof);
assert(ScnhdrBuf);
ScnhdrBuf.enlarge(SYM_TAB_INC * IMAGE_SECTION_HEADER.sizeof);
ScnhdrBuf.reserve(SCNHDR_TAB_INITSIZE * (IMAGE_SECTION_HEADER).sizeof);
}
ScnhdrBuf.setsize(0);
scnhdr_cnt = 0;
/* Define sections. Although the order should not matter, we duplicate
* the same order VC puts out just to avoid trouble.
*/
int alignText = I64 ? IMAGE_SCN_ALIGN_16BYTES : IMAGE_SCN_ALIGN_8BYTES;
int alignData = IMAGE_SCN_ALIGN_16BYTES;
MsCoffObj_addScnhdr(".data$B", IMAGE_SCN_CNT_INITIALIZED_DATA |
alignData |
IMAGE_SCN_MEM_READ |
IMAGE_SCN_MEM_WRITE); // DATA
MsCoffObj_addScnhdr(".text", IMAGE_SCN_CNT_CODE |
alignText |
IMAGE_SCN_MEM_EXECUTE |
IMAGE_SCN_MEM_READ); // CODE
MsCoffObj_addScnhdr(".bss$B", IMAGE_SCN_CNT_UNINITIALIZED_DATA |
alignData |
IMAGE_SCN_MEM_READ |
IMAGE_SCN_MEM_WRITE); // UDATA
MsCoffObj_addScnhdr(".rdata", IMAGE_SCN_CNT_INITIALIZED_DATA |
alignData |
IMAGE_SCN_MEM_READ); // CONST
seg_count = 0;
enum
{
SHI_DATA = 1,
SHI_TEXT = 2,
SHI_UDATA = 3,
SHI_CDATA = 4,
}
MsCoffObj_getsegment2(SHI_TEXT);
assert(SegData[CODE].SDseg == CODE);
MsCoffObj_getsegment2(SHI_DATA);
assert(SegData[DATA].SDseg == DATA);
MsCoffObj_getsegment2(SHI_CDATA);
assert(SegData[CDATA].SDseg == CDATA);
MsCoffObj_getsegment2(SHI_UDATA);
assert(SegData[UDATA].SDseg == UDATA);
if (config.fulltypes)
cv8_initfile(filename);
assert(objbuf.size() == 0);
return obj;
}
/**************************
* Start a module within a .obj file.
* There can be multiple modules within a single .obj file.
*
* Input:
* filename: Name of source file
* csegname: User specified default code segment name
*/
void MsCoffObj_initfile(const(char)* filename, const(char)* csegname, const(char)* modname)
{
//dbg_printf("MsCoffObj_initfile(filename = %s, modname = %s)\n",filename,modname);
version (SCPP)
{
if (csegname && *csegname && strcmp(csegname,".text"))
{ // Define new section and make it the default for cseg segment
// NOTE: cseg is initialized to CODE
IDXSEC newsecidx;
Elf32_Shdr *newtextsec;
IDXSYM newsymidx;
assert(!I64); // fix later
SegData[cseg].SDshtidx = newsecidx =
elf_newsection(csegname,0,SHT_PROGDEF,SHF_ALLOC|SHF_EXECINSTR);
newtextsec = &ScnhdrTab[newsecidx];
newtextsec.sh_addralign = 4;
SegData[cseg].SDsymidx =
elf_addsym(0, 0, 0, STT_SECTION, STB_LOCAL, newsecidx);
}
}
if (config.fulltypes)
cv8_initmodule(filename, modname);
}
/************************************
* Patch pseg/offset by adding in the vmaddr difference from
* pseg/offset to start of seg.
*/
int32_t *patchAddr(int seg, targ_size_t offset)
{
return cast(int32_t *)(fobjbuf.buf + ScnhdrTab[SegData[seg].SDshtidx].PointerToRawData + offset);
}
int32_t *patchAddr64(int seg, targ_size_t offset)
{
return cast(int32_t *)(fobjbuf.buf + ScnhdrTab[SegData[seg].SDshtidx].PointerToRawData + offset);
}
void patch(seg_data *pseg, targ_size_t offset, int seg, targ_size_t value)
{
//printf("patch(offset = x%04x, seg = %d, value = x%llx)\n", cast(uint)offset, seg, value);
if (I64)
{
int32_t *p = cast(int32_t *)(fobjbuf.buf + ScnhdrTab[pseg.SDshtidx].PointerToRawData + offset);
static if (0)
printf("\taddr1 = x%llx\n\taddr2 = x%llx\n\t*p = x%llx\n\tdelta = x%llx\n",
ScnhdrTab[pseg.SDshtidx].VirtualAddress,
ScnhdrTab[SegData[seg].SDshtidx].VirtualAddress,
*p,
ScnhdrTab[SegData[seg].SDshtidx].VirtualAddress -
(ScnhdrTab[pseg.SDshtidx].VirtualAddress + offset));
*p += ScnhdrTab[SegData[seg].SDshtidx].VirtualAddress -
(ScnhdrTab[pseg.SDshtidx].VirtualAddress - value);
}
else
{
int32_t *p = cast(int32_t *)(fobjbuf.buf + ScnhdrTab[pseg.SDshtidx].PointerToRawData + offset);
static if (0)
printf("\taddr1 = x%x\n\taddr2 = x%x\n\t*p = x%x\n\tdelta = x%x\n",
ScnhdrTab[pseg.SDshtidx].VirtualAddress,
ScnhdrTab[SegData[seg].SDshtidx].VirtualAddress,
*p,
ScnhdrTab[SegData[seg].SDshtidx].VirtualAddress -
(ScnhdrTab[pseg.SDshtidx].VirtualAddress + offset));
*p += ScnhdrTab[SegData[seg].SDshtidx].VirtualAddress -
(ScnhdrTab[pseg.SDshtidx].VirtualAddress - value);
}
}
/*********************************
* Build syment[], the array of symbols.
* Store them in syment_buf.
*/
private void syment_set_name(SymbolTable32 *sym, const(char)* name)
{
size_t len = strlen(name);
if (len > 8)
{ // Use offset into string table
IDXSTR idx = MsCoffObj_addstr(string_table, name);
sym.Zeros = 0;
sym.Offset = idx;
}
else
{ memcpy(sym.Name.ptr, name, len);
if (len < 8)
memset(sym.Name.ptr + len, 0, 8 - len);
}
}
void write_sym(SymbolTable32* sym, bool bigobj)
{
assert((*sym).sizeof == 20);
if (bigobj)
{
syment_buf.write(sym[0 .. 1]);
}
else
{
// the only difference between SymbolTable32 and SymbolTable
// is that field SectionNumber is long instead of short
uint scoff = cast(uint)(cast(char*)&sym.SectionNumber - cast(char*)sym);
syment_buf.write(sym, scoff + 2);
syment_buf.write(cast(char*)sym + scoff + 4, cast(uint)((*sym).sizeof - scoff - 4));
}
}
void build_syment_table(bool bigobj)
{
/* The @comp.id symbol appears to be the version of VC that generated the .obj file.
* Anything we put in there would have no relevance, so we'll not put out this symbol.
*/
uint symsize = bigobj ? SymbolTable32.sizeof : SymbolTable.sizeof;
/* Now goes one symbol per section.
*/
for (segidx_t seg = 1; seg <= seg_count; seg++)
{
seg_data *pseg = SegData[seg];
IMAGE_SECTION_HEADER *psechdr = &ScnhdrTab[pseg.SDshtidx]; // corresponding section
SymbolTable32 sym;
memcpy(sym.Name.ptr, psechdr.Name.ptr, 8);
sym.Value = 0;
sym.SectionNumber = pseg.SDshtidx;
sym.Type = 0;
sym.StorageClass = IMAGE_SYM_CLASS_STATIC;
sym.NumberOfAuxSymbols = 1;
write_sym(&sym, bigobj);
auxent aux = void;
memset(&aux, 0, (aux).sizeof);
// s_size is not set yet
//aux.x_section.length = psechdr.s_size;
if (pseg.SDbuf && pseg.SDbuf.size())
aux.x_section.length = cast(uint)pseg.SDbuf.size();
else
aux.x_section.length = cast(uint)pseg.SDoffset;
if (pseg.SDrel)
aux.x_section.NumberOfRelocations = cast(ushort)(pseg.SDrel.size() / (Relocation).sizeof);
if (psechdr.Characteristics & IMAGE_SCN_LNK_COMDAT)
{
aux.x_section.Selection = cast(ubyte)IMAGE_COMDAT_SELECT_ANY;
if (pseg.SDassocseg)
{ aux.x_section.Selection = cast(ubyte)IMAGE_COMDAT_SELECT_ASSOCIATIVE;
aux.x_section.NumberHighPart = cast(ushort)(pseg.SDassocseg >> 16);
aux.x_section.NumberLowPart = cast(ushort)(pseg.SDassocseg & 0x0000FFFF);
}
}
memset(&aux.x_section.Zeros, 0, 2);
syment_buf.write(&aux, symsize);
assert((aux).sizeof == 20);
}
/* Add symbols from symbuf[]
*/
int n = seg_count + 1;
size_t dim = symbuf.size() / (Symbol *).sizeof;
for (size_t i = 0; i < dim; i++)
{ Symbol *s = (cast(Symbol **)symbuf.buf)[i];
s.Sxtrnnum = cast(uint)(syment_buf.size() / symsize);
n++;
SymbolTable32 sym;
char[DEST_LEN+1] dest = void;
char *destr = obj_mangle2(s, dest.ptr);
syment_set_name(&sym, destr);
sym.Value = 0;
switch (s.Sclass)
{
case SCextern:
sym.SectionNumber = IMAGE_SYM_UNDEFINED;
break;
default:
sym.SectionNumber = SegData[s.Sseg].SDshtidx;
break;
}
sym.Type = tyfunc(s.Stype.Tty) ? 0x20 : 0;
switch (s.Sclass)
{
case SCstatic:
if (s.Sflags & SFLhidden)
goto default;
goto case;
case SClocstat:
sym.StorageClass = IMAGE_SYM_CLASS_STATIC;
sym.Value = cast(uint)s.Soffset;
break;
default:
sym.StorageClass = IMAGE_SYM_CLASS_EXTERNAL;
if (sym.SectionNumber != IMAGE_SYM_UNDEFINED)
sym.Value = cast(uint)s.Soffset;
break;
}
sym.NumberOfAuxSymbols = 0;
write_sym(&sym, bigobj);
}
}
/***************************
* Fixup and terminate object file.
*/
void MsCoffObj_termfile()
{
//dbg_printf("MsCoffObj_termfile\n");
if (configv.addlinenumbers)
{
cv8_termmodule();
}
}
/*********************************
* Terminate package.
*/
void MsCoffObj_term(const(char)* objfilename)
{
//printf("MsCoffObj_term()\n");
assert(fobjbuf.size() == 0);
version (SCPP)
{
if (!errcnt)
{
objflush_pointerRefs();
outfixlist(); // backpatches
}
}
else
{
objflush_pointerRefs();
outfixlist(); // backpatches
}
if (configv.addlinenumbers)
{
cv8_termfile(objfilename);
}
version (SCPP)
{
if (errcnt)
return;
}
// To allow tooling support for most output files
// switch to new object file format (similar to C++ with /bigobj)
// only when exceeding the limit for 16-bit section count according to
// https://msdn.microsoft.com/en-us/library/8578y171%28v=vs.71%29.aspx
bool bigobj = scnhdr_cnt > 65279;
build_syment_table(bigobj);
/* Write out the object file in the following order:
* Header
* Section Headers
* Symbol table
* String table
* Section data
*/
uint foffset;
// Write out the bytes for the header
BIGOBJ_HEADER header = void;
IMAGE_FILE_HEADER header_old = void;
time_t f_timedat = 0;
time(&f_timedat);
uint symtable_offset;
if (bigobj)
{
header.Sig1 = IMAGE_FILE_MACHINE_UNKNOWN;
header.Sig2 = 0xFFFF;
header.Version = 2;
header.Machine = I64 ? IMAGE_FILE_MACHINE_AMD64 : IMAGE_FILE_MACHINE_I386;
header.NumberOfSections = scnhdr_cnt;
header.TimeDateStamp = cast(uint)f_timedat;
static immutable ubyte[16] uuid =
[ '\xc7', '\xa1', '\xba', '\xd1', '\xee', '\xba', '\xa9', '\x4b',
'\xaf', '\x20', '\xfa', '\xf6', '\x6a', '\xa4', '\xdc', '\xb8' ];
memcpy(header.UUID.ptr, uuid.ptr, 16);
memset(header.unused.ptr, 0, (header.unused).sizeof);
foffset = (header).sizeof; // start after header
foffset += ScnhdrBuf.size(); // section headers
header.PointerToSymbolTable = foffset; // offset to symbol table
symtable_offset = foffset;
header.NumberOfSymbols = cast(uint)(syment_buf.size() / (SymbolTable32).sizeof);
foffset += header.NumberOfSymbols * (SymbolTable32).sizeof; // symbol table
}
else
{
header_old.Machine = I64 ? IMAGE_FILE_MACHINE_AMD64 : IMAGE_FILE_MACHINE_I386;
header_old.NumberOfSections = cast(ushort)scnhdr_cnt;
header_old.TimeDateStamp = cast(uint)f_timedat;
header_old.SizeOfOptionalHeader = 0;
header_old.Characteristics = 0;
foffset = (header_old).sizeof; // start after header
foffset += ScnhdrBuf.size(); // section headers
header_old.PointerToSymbolTable = foffset; // offset to symbol table
symtable_offset = foffset;
header_old.NumberOfSymbols = cast(uint)(syment_buf.size() / (SymbolTable).sizeof);
foffset += header_old.NumberOfSymbols * (SymbolTable).sizeof; // symbol table
}
uint string_table_offset = foffset;
foffset += string_table.size(); // string table
// Compute file offsets of all the section data
for (segidx_t seg = 1; seg <= seg_count; seg++)
{
seg_data *pseg = SegData[seg];
IMAGE_SECTION_HEADER *psechdr = &ScnhdrTab[pseg.SDshtidx]; // corresponding section
int align_ = pseg.SDalignment;
if (align_ > 1)
foffset = (foffset + align_ - 1) & ~(align_ - 1);
if (pseg.SDbuf && pseg.SDbuf.size())
{
psechdr.PointerToRawData = foffset;
//printf("seg = %2d SDshtidx = %2d psechdr = %p s_scnptr = x%x\n", seg, pseg.SDshtidx, psechdr, cast(uint)psechdr.s_scnptr);
psechdr.SizeOfRawData = cast(uint)pseg.SDbuf.size();
foffset += psechdr.SizeOfRawData;
}
else
psechdr.SizeOfRawData = cast(uint)pseg.SDoffset;
}
// Compute file offsets of the relocation data
for (segidx_t seg = 1; seg <= seg_count; seg++)
{
seg_data *pseg = SegData[seg];
IMAGE_SECTION_HEADER *psechdr = &ScnhdrTab[pseg.SDshtidx]; // corresponding section
if (pseg.SDrel)
{
foffset = (foffset + 3) & ~3;
assert(psechdr.PointerToRelocations == 0);
auto nreloc = pseg.SDrel.size() / Relocation.sizeof;
if (nreloc > 0xffff)
{
// https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#coff-relocations-object-only
psechdr.Characteristics |= IMAGE_SCN_LNK_NRELOC_OVFL;
psechdr.PointerToRelocations = foffset;
psechdr.NumberOfRelocations = 0xffff;
foffset += reloc.sizeof;
}
else if (nreloc)
{
psechdr.PointerToRelocations = foffset;
//printf("seg = %d SDshtidx = %d psechdr = %p s_relptr = x%x\n", seg, pseg.SDshtidx, psechdr, cast(uint)psechdr.s_relptr);
psechdr.NumberOfRelocations = cast(ushort)nreloc;
}
foffset += nreloc * reloc.sizeof;
}
}
assert(fobjbuf.size() == 0);
// Write the header
if (bigobj)
{
fobjbuf.write((&header)[0 .. 1]);
foffset = (header).sizeof;
}
else
{
fobjbuf.write((&header_old)[0 .. 1]);
foffset = (header_old).sizeof;
}
// Write the section headers
fobjbuf.write(ScnhdrBuf);
foffset += ScnhdrBuf.size();
// Write the symbol table
assert(foffset == symtable_offset);
fobjbuf.write(syment_buf);
foffset += syment_buf.size();
// Write the string table
assert(foffset == string_table_offset);
*cast(uint *)(string_table.buf) = cast(uint)string_table.size();
fobjbuf.write(string_table);
foffset += string_table.size();
// Write the section data
for (segidx_t seg = 1; seg <= seg_count; seg++)
{
seg_data *pseg = SegData[seg];
IMAGE_SECTION_HEADER *psechdr = &ScnhdrTab[pseg.SDshtidx]; // corresponding section
foffset = elf_align(pseg.SDalignment, foffset);
if (pseg.SDbuf && pseg.SDbuf.size())
{
//printf("seg = %2d SDshtidx = %2d psechdr = %p s_scnptr = x%x, foffset = x%x\n", seg, pseg.SDshtidx, psechdr, cast(uint)psechdr.s_scnptr, cast(uint)foffset);
assert(pseg.SDbuf.size() == psechdr.SizeOfRawData);
assert(foffset == psechdr.PointerToRawData);
fobjbuf.write(pseg.SDbuf);
foffset += pseg.SDbuf.size();
}
}
// Compute the relocations, write them out
assert((reloc).sizeof == 10);
for (segidx_t seg = 1; seg <= seg_count; seg++)
{
seg_data *pseg = SegData[seg];
IMAGE_SECTION_HEADER *psechdr = &ScnhdrTab[pseg.SDshtidx]; // corresponding section
if (pseg.SDrel)
{
Relocation *r = cast(Relocation *)pseg.SDrel.buf;
size_t sz = pseg.SDrel.size();
bool pdata = (strcmp(cast(const(char)* )psechdr.Name, ".pdata") == 0);
Relocation *rend = cast(Relocation *)(pseg.SDrel.buf + sz);
foffset = elf_align(4, foffset);
debug
if (sz && foffset != psechdr.PointerToRelocations)
printf("seg = %d SDshtidx = %d psechdr = %p s_relptr = x%x, foffset = x%x\n", seg, pseg.SDshtidx, psechdr, cast(uint)psechdr.PointerToRelocations, cast(uint)foffset);
assert(sz == 0 || foffset == psechdr.PointerToRelocations);
if (psechdr.Characteristics & IMAGE_SCN_LNK_NRELOC_OVFL)
{
auto rel = reloc(cast(uint)(sz / Relocation.sizeof) + 1);
fobjbuf.write((&rel)[0 .. 1]);
foffset += rel.sizeof;
}
for (; r != rend; r++)
{ reloc rel;
rel.r_vaddr = 0;
rel.r_symndx = 0;
rel.r_type = 0;
Symbol *s = r.targsym;
const(char)* rs = r.rtype == RELaddr ? "addr" : "rel";
//printf("%d:x%04lx : tseg %d tsym %s REL%s\n", seg, cast(int)r.offset, r.targseg, s ? s.Sident.ptr : "0", rs);
if (s)
{
//printf("Relocation\n");
//symbol_print(s);
if (pseg.isCode())
{
if (I64)
{
rel.r_type = (r.rtype == RELrel)
? IMAGE_REL_AMD64_REL32
: IMAGE_REL_AMD64_REL32;
if (s.Stype.Tty & mTYthread)
rel.r_type = IMAGE_REL_AMD64_SECREL;
if (r.val == -1)
rel.r_type = IMAGE_REL_AMD64_REL32_1;
else if (r.val == -2)
rel.r_type = IMAGE_REL_AMD64_REL32_2;
else if (r.val == -3)
rel.r_type = IMAGE_REL_AMD64_REL32_3;
else if (r.val == -4)
rel.r_type = IMAGE_REL_AMD64_REL32_4;
else if (r.val == -5)
rel.r_type = IMAGE_REL_AMD64_REL32_5;
/+if (s.Sclass == SCextern ||
s.Sclass == SCcomdef ||
s.Sclass == SCcomdat ||
s.Sclass == SCglobal)
{
rel.r_vaddr = cast(uint)r.offset;
rel.r_symndx = s.Sxtrnnum;
}
else+/
{
rel.r_vaddr = cast(uint)r.offset;
rel.r_symndx = s.Sxtrnnum;
}
}
else if (I32)
{
rel.r_type = (r.rtype == RELrel)
? IMAGE_REL_I386_REL32
: IMAGE_REL_I386_DIR32;
if (s.Stype.Tty & mTYthread)
rel.r_type = IMAGE_REL_I386_SECREL;
/+if (s.Sclass == SCextern ||
s.Sclass == SCcomdef ||
s.Sclass == SCcomdat ||
s.Sclass == SCglobal)
{
rel.r_vaddr = cast(uint)r.offset;
rel.r_symndx = s.Sxtrnnum;
}
else+/
{
rel.r_vaddr = cast(uint)r.offset;
rel.r_symndx = s.Sxtrnnum;
}
}
else
assert(false); // not implemented for I16
}
else
{
if (I64)