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elf.c
1390 lines (1219 loc) · 51 KB
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elf.c
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/****************************************************************************
*
* This code is Public Domain.
*
* ========================================================================
*
* Description: ELF output routines
*
****************************************************************************/
#include <ctype.h>
#include <time.h>
#include "globals.h"
#include "memalloc.h"
#include "parser.h"
#include "mangle.h"
#include "fixup.h"
#include "segment.h"
#include "extern.h"
#include "elf.h"
#include "elfspec.h"
#include "myassert.h"
#if ELF_SUPPORT
/* v2.03: create weak externals for ALIAS symbols.
* Since the syntax of the ALIAS directive requires
* 2 names and, OTOH, the ELF implementation of weak
* externals has no "default resolution", the usefullness
* of this option is questionable. Additionally, there's
* the "EXTERN <name> (<altname>)" syntax, which also allows
* to define a weak external.
*/
#define ELFALIAS 0
/* start label is always public for COFF/ELF, no need to add it */
#define ADDSTARTLABEL 0
/* there's no STT_IMPORT type for ELF, it's OW specific */
#define OWELFIMPORT 0
/* use GNU extensions for LD ( 16bit and 8bit relocations ) */
#define GNURELOCS 1
#define MANGLE_BYTES 8 /* extra size required for name decoration */
#define IsWeak( x ) ( x.iscomm == FALSE && x.altname )
/* section attributes for ELF
* execute write alloc type
*---------------------------------------
* CODE x x progbits
* CONST x progbits
* DATA x x progbits
* BSS x x nobits
* STACK x x progbits
* others x x progbits
*
* todo: translate section bits:
* - INFO -> SHT_NOTE (added in v2.07)
* - DISCARD ->
* - SHARED ->
* - EXECUTE -> SHF_EXECINSTR
* - READ ->
* - WRITE -> SHF_WRITE
*/
/* v2.12: global variables replaced by struct elfmod */
//static uint_32 symindex; /* entries in symbol table */
//static uint_32 start_globals; /* start index globals in symbol table */
//static char *srcname; /* name of source module (name + extension) */
//static bool extused;
struct localname {
void *next;
struct asym *sym;
};
enum internal_sections {
SHSTRTAB_IDX,
SYMTAB_IDX,
STRTAB_IDX,
NUM_INTSEGS
};
struct intsegparm {
const char *name;
unsigned type;
};
/* constant parameters of internal sections; order must match enum internal_sections */
static const struct intsegparm internal_segparms[] = {
{ ".shstrtab", SHT_STRTAB },
{ ".symtab", SHT_SYMTAB },
{ ".strtab", SHT_STRTAB },
};
struct intseg {
uint_32 size;
uint_32 fileoffset;
void *data;
};
//static struct intseg internal_segs[NUM_INTSEGS];
/* v2.12: all global variables replaced by struct elfmod */
struct elfmod {
uint_32 symindex; /* entries in symbol table */
uint_32 start_globals; /* start index globals in symbol table */
char *srcname; /* name of source module (name + extension) */
#if GNURELOCS
bool extused; /* gnu extensions used */
#endif
struct intseg internal_segs[NUM_INTSEGS];
union {
Elf32_Ehdr ehdr32;
#if AMD64_SUPPORT
Elf64_Ehdr ehdr64;
#endif
};
};
/* struct to help convert section names in COFF, ELF, PE */
struct conv_section {
uint_8 len;
uint_8 flags; /* see below */
const char *src;
const char *dst;
};
enum cvs_flags {
CSF_GRPCHK = 1
};
static const struct conv_section cst[] = {
{ 5, CSF_GRPCHK, "_TEXT", ".text" },
{ 5, CSF_GRPCHK, "_DATA", ".data" },
{ 5, CSF_GRPCHK, "CONST", ".rodata" }, /* v2.05: .rdata -> .rodata */
{ 4, 0, "_BSS", ".bss" }
};
/* translate section names:
* see cst[] above for details.
*/
static char *ElfConvertSectionName( const struct asym *sym, char *buffer )
/************************************************************************/
{
int i;
for ( i = 0; i < sizeof( cst ) / sizeof( cst[0] ); i++ ) {
if ( memcmp( sym->name, cst[i].src, cst[i].len ) == 0 ) {
if ( sym->name[cst[i].len] == NULLC )
return( (char *)cst[i].dst );
else if ( ( cst[i].flags & CSF_GRPCHK ) && sym->name[cst[i].len] == '$' ) {
strcpy( buffer, cst[i].dst );
strcat( buffer, sym->name+cst[i].len );
return( buffer );
}
}
}
return( sym->name );
}
/* get number of sections that have relocations */
static int get_num_reloc_sections( void )
/***************************************/
{
struct dsym *curr;
int num = 0;
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next ) {
if ( curr->e.seginfo->FixupList.head )
num++;
}
return( num );
}
/* fill entries in ELF32 symbol table */
static uint_32 set_symtab32( struct elfmod *em, uint_32 entries, struct localname *localshead )
/*********************************************************************************************/
{
uint_32 strsize = 1;
uint_32 len;
uint_8 stt;
struct dsym *curr;
struct asym *sym;
struct localname *localscurr;
struct qnode *q;
Elf32_Sym *p32;
char buffer[MAX_ID_LEN + MANGLE_BYTES + 1];
em->internal_segs[SYMTAB_IDX].size = entries * sizeof( Elf32_Sym );
em->internal_segs[SYMTAB_IDX].data = LclAlloc( em->internal_segs[SYMTAB_IDX].size );
memset( em->internal_segs[SYMTAB_IDX].data, 0, em->internal_segs[SYMTAB_IDX].size );
p32 = (Elf32_Sym *)em->internal_segs[SYMTAB_IDX].data;
p32++; /* skip NULL entry */
/* 1. make file entry */
p32->st_name = strsize; /* symbol's name in string table */
strsize += strlen( em->srcname ) + 1;
p32->st_value = 0;
p32->st_size = 0;
p32->st_info = ELF32_ST_INFO( STB_LOCAL, STT_FILE ); /* symbol's type and binding info */
p32->st_shndx = SHN_ABS; /* section index */
p32++;
/* 2. make section entries */
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next ) {
//p32->st_name = ?; /* name isn't set */
p32->st_info = ELF32_ST_INFO( STB_LOCAL, STT_SECTION );
p32->st_shndx = GetSegIdx( curr->sym.segment );
p32++;
}
/* 3. locals */
for ( localscurr = localshead ; localscurr ; localscurr = localscurr->next ) {
len = Mangle( localscurr->sym, buffer );
p32->st_name = strsize;
curr = (struct dsym *)localscurr->sym->segment;
if ( curr && curr->e.seginfo->segtype != SEGTYPE_CODE )
stt = STT_OBJECT;
else
stt = STT_FUNC;
p32->st_info = ELF32_ST_INFO( STB_LOCAL, stt );
p32->st_value = localscurr->sym->offset;
#if 1 /* v2.07: changed - to make MT_ABS obsolete */
if ( curr )
p32->st_shndx = GetSegIdx( &curr->sym );
else
p32->st_shndx = SHN_ABS;
#else
if ( localscurr->sym->mem_type == MT_ABS )
p32->st_shndx = SHN_ABS;
else
p32->st_shndx = GetSegIdx( &curr->sym );
#endif
strsize += len + 1;
DebugMsg(("set_symtab32, LOCAL: symbol %s, value=%X\n", buffer, p32->st_value));
p32++;
}
/* 4. externals + communals (+ protos [since v2.01]) */
for( curr = SymTables[TAB_EXT].head ; curr != NULL ;curr = curr->next ) {
/* skip "weak" (=unused) externdefs */
if ( curr->sym.iscomm == FALSE && curr->sym.weak == TRUE )
continue;
len = Mangle( &curr->sym, buffer );
p32->st_name = strsize;
/* for COMMUNALs, store their size in the Value field */
if ( curr->sym.iscomm == TRUE ) {
p32->st_info = ELF32_ST_INFO( STB_GLOBAL, STT_COMMON );
p32->st_value = curr->sym.total_size;
p32->st_shndx = SHN_COMMON;
} else {
#if OWELFIMPORT
p32->st_info = ( IsWeak( curr->sym ) ? ELF32_ST_INFO( STB_WEAK, STT_IMPORT ) : ELF32_ST_INFO( STB_GLOBAL, STT_IMPORT ) );
#else
/* todo: set STT_FUNC for prototypes/code labels??? */
p32->st_info = ( IsWeak( curr->sym ) ? ELF32_ST_INFO( STB_WEAK, STT_NOTYPE ) : ELF32_ST_INFO( STB_GLOBAL, STT_NOTYPE ) );
#endif
p32->st_value = curr->sym.offset; /* is always 0 */
p32->st_shndx = SHN_UNDEF;
}
strsize += len + 1;
DebugMsg(("set_symtab32, EXTERNAL: symbol %s, info=%X, shndx=%X, value=%X\n", buffer, p32->st_info, p32->st_shndx, p32->st_value));
p32++;
}
#if ELFALIAS
/* 5. aliases */
for( curr = SymTables[TAB_ALIAS].head ; curr != NULL ;curr = curr->next ) {
len = Mangle( &curr->sym, buffer );
p32->st_name = strsize;
#if OWELFIMPORT
p32->st_info = ELF32_ST_INFO( STB_WEAK, STT_IMPORT );
#else
p32->st_info = ELF32_ST_INFO( STB_WEAK, STT_NOTYPE );
#endif
p32->st_value = 0; /* is always 0 */
p32->st_shndx = SHN_UNDEF;
strsize += len + 1;
DebugMsg(("set_symtab32, ALIAS: symbol %s, value=%X\n", buffer, p32->st_value));
p32++;
}
#endif
/* 6. PUBLIC entries */
for ( q = ModuleInfo.g.PubQueue.head; q; q = q->next ) {
sym = q->sym;
len = Mangle( sym, buffer );
curr = (struct dsym *)sym->segment;
if ( curr && curr->e.seginfo->segtype != SEGTYPE_CODE )
stt = STT_OBJECT;
else
stt = STT_FUNC;
p32->st_name = strsize;
p32->st_info = ELF32_ST_INFO( STB_GLOBAL, stt );
p32->st_value = sym->offset;
#if 1 /* v2.07: changed - to make MT_ABS obsolete */
if ( sym->state == SYM_INTERNAL )
if ( curr )
p32->st_shndx = GetSegIdx( &curr->sym );
else
p32->st_shndx = SHN_ABS;
else
p32->st_shndx = SHN_UNDEF;
#else
if ( sym->mem_type == MT_ABS )
p32->st_shndx = SHN_ABS;
else if ( curr )
p32->st_shndx = GetSegIdx( &curr->sym );
else
p32->st_shndx = SHN_UNDEF;
#endif
strsize += len + 1;
DebugMsg(("set_symtab32, PUBLIC+LOCAL: symbol %s, value=%X\n", buffer, p32->st_value));
p32++;
}
#if ADDSTARTLABEL
if ( ModuleInfo.g.start_label ) {
len = Mangle( ModuleInfo.g.start_label, buffer );
p32->st_name = strsize;
p32->st_info = ELF32_ST_INFO( STB_ENTRY, STT_FUNC );
p32->st_value = ModuleInfo.g.start_label->offset;
p32->st_shndx = GetSegIdx( ModuleInfo.g.start_label->segment );
strsize += len + 1;
DebugMsg(("set_symtab32, ENTRY: symbol %s, value=%X\n", buffer, p32->st_value));
p32++;
}
#endif
return( strsize );
}
#if AMD64_SUPPORT
/* fill entries in ELF64 symbol table:
typedef struct {
uint_32 st_name; // +0 symbol name index into string table
uint_8 st_info; // +4 symbol's type and binding attribs.
uint_8 st_other; // +5 no meaning yet.
uint_16 st_shndx; // +6 section index
uint_64 st_value; // +8 symbol "value"
uint_64 st_size; // +16 symbol size
} Elf64_Sym;
*/
static uint_32 set_symtab64( struct elfmod *em, uint_32 entries, struct localname *localshead )
/*********************************************************************************************/
{
uint_32 strsize = 1;
uint_32 len;
uint_8 stt;
struct dsym *curr;
struct asym *sym;
struct localname *localscurr;
struct qnode *q;
Elf64_Sym *p64;
char buffer[MAX_ID_LEN + MANGLE_BYTES + 1];
em->internal_segs[SYMTAB_IDX].size = entries * sizeof( Elf64_Sym );
em->internal_segs[SYMTAB_IDX].data = LclAlloc( em->internal_segs[SYMTAB_IDX].size );
memset( em->internal_segs[SYMTAB_IDX].data, 0, em->internal_segs[SYMTAB_IDX].size );
p64 = (Elf64_Sym *)em->internal_segs[SYMTAB_IDX].data;
p64++; /* skip NULL entry */
/* 1. make file entry */
p64->st_name = strsize; /* symbol's name in string table */
strsize += strlen( em->srcname ) + 1;
p64->st_value = 0;
p64->st_size = 0;
p64->st_info = ELF64_ST_INFO( STB_LOCAL, STT_FILE ); /* symbol's type and binding info */
p64->st_shndx = SHN_ABS; /* section index */
p64++;
/* 2. make section entries */
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next ) {
//p64->st_name = ?; /* name isn't set */
p64->st_info = ELF64_ST_INFO( STB_LOCAL, STT_SECTION );
p64->st_shndx = GetSegIdx( curr->sym.segment );
p64++;
}
/* 3. locals */
for ( localscurr = localshead ; localscurr ; localscurr = localscurr->next ) {
len = Mangle( localscurr->sym, buffer );
p64->st_name = strsize;
curr = (struct dsym *)localscurr->sym->segment;
if ( curr && curr->e.seginfo->segtype != SEGTYPE_CODE )
stt = STT_OBJECT;
else
stt = STT_FUNC;
p64->st_info = ELF64_ST_INFO( STB_LOCAL, stt );
p64->st_value = localscurr->sym->offset;
#if 1 /* v2.07: changed - to make MT_ABS obsolete */
if ( curr )
p64->st_shndx = GetSegIdx( &curr->sym );
else
p64->st_shndx = SHN_ABS;
#else
if ( localscurr->sym->mem_type == MT_ABS )
p64->st_shndx = SHN_ABS;
else
p64->st_shndx = GetSegIdx( &curr->sym );
#endif
strsize += len + 1;
DebugMsg(("set_symtab64, LOCAL: symbol %s, value=%" I64_SPEC "X\n", buffer, p64->st_value));
p64++;
}
/* 4. externals + communals ( + protos [since v2.01]) */
for( curr = SymTables[TAB_EXT].head ; curr != NULL ;curr = curr->next ) {
/* skip "weak" (=unused) externdefs */
if ( curr->sym.iscomm == FALSE && curr->sym.weak == TRUE )
continue;
len = Mangle( &curr->sym, buffer );
p64->st_name = strsize;
/* for COMMUNALs, store their size in the Value field */
if ( curr->sym.iscomm == TRUE ) {
p64->st_info = ELF64_ST_INFO( STB_GLOBAL, STT_COMMON );
p64->st_value = curr->sym.total_size;
p64->st_shndx = SHN_COMMON;
} else {
#if OWELFIMPORT
p64->st_info = ( IsWeak( curr->sym ) ? ELF64_ST_INFO( STB_WEAK, STT_IMPORT ) : ELF64_ST_INFO( STB_GLOBAL, STT_IMPORT ) );
#else
/* todo: set STT_FUNC for prototypes??? */
p64->st_info = ( IsWeak( curr->sym ) ? ELF64_ST_INFO( STB_WEAK, STT_NOTYPE ) : ELF64_ST_INFO( STB_GLOBAL, STT_NOTYPE ) );
#endif
p64->st_value = curr->sym.offset; /* is always 0 */
p64->st_shndx = SHN_UNDEF;
}
strsize += len + 1;
DebugMsg(("set_symtab64, EXTERNAL: symbol %s, info=%X, shndx=%X, value=%" I64_SPEC "X\n", buffer, p64->st_info, p64->st_shndx, p64->st_value));
p64++;
}
#if ELFALIAS
/* 5. aliases */
for( curr = SymTables[TAB_ALIAS].head ; curr != NULL ;curr = curr->next ) {
len = Mangle( &curr->sym, buffer );
p64->st_name = strsize;
#if OWELFIMPORT
p64->st_info = ELF64_ST_INFO( STB_WEAK, STT_IMPORT );
#else
p64->st_info = ELF64_ST_INFO( STB_WEAK, STT_NOTYPE );
#endif
p64->st_value = 0; /* is always 0 */
p64->st_shndx = SHN_UNDEF;
strsize += len + 1;
DebugMsg(("set_symtab64, ALIASES: symbol %s, value=%" I64_SPEC "X\n", buffer, p64->st_value));
p64++;
}
#endif
/* 6. PUBLIC entries */
for ( q = ModuleInfo.g.PubQueue.head; q; q = q->next ) {
sym = q->sym;
len = Mangle( sym, buffer );
curr = (struct dsym *)sym->segment;
if ( curr && curr->e.seginfo->segtype != SEGTYPE_CODE )
stt = STT_OBJECT;
else
stt = STT_FUNC;
p64->st_name = strsize;
p64->st_info = ELF64_ST_INFO( STB_GLOBAL, stt );
p64->st_value = sym->offset;
#if 1 /* v2.07: changed - to make MT_ABS obsolete */
if ( sym->state == SYM_INTERNAL )
if ( curr )
p64->st_shndx = GetSegIdx( &curr->sym );
else
p64->st_shndx = SHN_ABS;
else
p64->st_shndx = SHN_UNDEF;
#else
if ( sym->mem_type == MT_ABS )
p64->st_shndx = SHN_ABS;
else if ( curr )
p64->st_shndx = GetSegIdx( &curr->sym );
else
p64->st_shndx = SHN_UNDEF;
#endif
strsize += len + 1;
DebugMsg(("set_symtab64, PUBLIC+LOCAL: symbol %s, info=%X, shndx=%X, value=%" I64_SPEC "X\n", buffer, p64->st_info, p64->st_shndx, p64->st_value));
p64++;
}
#if ADDSTARTLABEL
if ( ModuleInfo.g.start_label ) {
len = Mangle( ModuleInfo.g.start_label, buffer );
p64->st_name = strsize;
p64->st_info = ELF64_ST_INFO( STB_ENTRY, STT_FUNC );
p64->st_value = ModuleInfo.g.start_label->offset;
p64->st_shndx = GetSegIdx( ModuleInfo.g.start_label->segment );
strsize += len + 1;
DebugMsg(("set_symtab64, ENTRY: symbol %s, value=%" I64_SPEC "X\n", buffer, p64->st_value));
p64++;
}
#endif
return( strsize );
}
#endif
/* calculate size of .symtab + .strtab section.
* set content of these sections.
*/
static void set_symtab_values( struct elfmod *em )
/************************************************/
{
uint_32 strsize;
uint_32 entries;
struct dsym *curr;
//struct asym *sym;
struct qnode *q;
char *p2;
struct {
struct localname *head;
struct localname *tail;
} locals = { NULL, NULL };
struct localname *localscurr;
/* symbol table. there is
- 1 NULL entry,
- 1 entry for the module/file,
- 1 entry for each section and
- n entries for local symbols
- m entries for global symbols
*/
/* symbol table starts with 1 NULL entry + 1 file entry */
em->symindex = 1 + 1;
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next )
curr->sym.ext_idx = em->symindex++;
/* add local symbols to symbol table */
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next ) {
if ( curr->e.seginfo->num_relocs ) {
struct fixup *fix = curr->e.seginfo->FixupList.head;
for ( ; fix; fix = fix->nextrlc ) {
/* if it's not EXTERNAL/PUBLIC, add symbol. */
/* however, if it's an assembly time variable */
/* use a raw section reference */
if ( fix->sym->variable ) {
fix->sym = fix->segment_var;
} else if ( ( fix->sym->state == SYM_INTERNAL ) &&
fix->sym->included == FALSE &&
fix->sym->ispublic == FALSE ) {
fix->sym->included = TRUE;
localscurr = LclAlloc( sizeof( struct localname ) );
localscurr->next = NULL;
localscurr->sym = fix->sym;
if (locals.tail) {
locals.tail->next = localscurr;
locals.tail = localscurr;
} else {
locals.head = locals.tail = localscurr;
}
fix->sym->ext_idx = em->symindex++;
}
}
}
}
DebugMsg(("set_symtab_values: index after sections: %u\n", em->symindex));
em->start_globals = em->symindex;
/* count EXTERNs and used EXTERNDEFs (and PROTOs [since v2.01]) */
for( curr = SymTables[TAB_EXT].head ; curr != NULL ;curr = curr->next ) {
if ( curr->sym.iscomm == FALSE && curr->sym.weak == TRUE )
continue;
curr->sym.ext_idx = em->symindex++;
}
DebugMsg(("set_symtab_values: index after EXTERNALs: %u\n", em->symindex));
#if ELFALIAS
/* count aliases */
for( curr = SymTables[TAB_ALIAS].head ; curr != NULL ;curr = curr->next ) {
curr->sym.idx = em->symindex++;
}
DebugMsg(("set_symtab_values: index after ALIASES: %u\n", em->symindex));
#endif
/* count publics */
for ( q = ModuleInfo.g.PubQueue.head; q; q = q->next ) {
q->sym->ext_idx = em->symindex++;
}
DebugMsg(("set_symtab_values: index after PUBLICs: %u\n", em->symindex));
/* size of symbol table is defined */
entries = em->symindex;
#if ADDSTARTLABEL
if ( ModuleInfo.g.start_label )
entries++;
#endif
#if AMD64_SUPPORT
if ( ModuleInfo.defOfssize == USE64 )
strsize = set_symtab64( em, entries, locals.head );
else
#endif
strsize = set_symtab32( em, entries, locals.head );
/* generate the string table */
DebugMsg(("set_symtab_values: creating string table, size=%X\n", strsize));
em->internal_segs[STRTAB_IDX].size = strsize;
em->internal_segs[STRTAB_IDX].data = LclAlloc( strsize );
memset( em->internal_segs[STRTAB_IDX].data, 0, strsize );
p2 = em->internal_segs[STRTAB_IDX].data;
*p2++ = NULLC;
strcpy( p2, em->srcname );
p2 += strlen( p2 ) + 1;
for ( localscurr = locals.head ; localscurr ; localscurr = localscurr->next ) {
p2 += Mangle( localscurr->sym, p2 ) + 1;
}
for( curr = SymTables[TAB_EXT].head ; curr != NULL ;curr = curr->next ) {
if ( curr->sym.iscomm == FALSE && curr->sym.weak == TRUE )
continue;
p2 += Mangle( &curr->sym, p2 ) + 1;
}
#if ELFALIAS
for( curr = SymTables[TAB_ALIAS].head ; curr != NULL ;curr = curr->next ) {
p2 += Mangle( &curr->sym, p2 ) + 1;
}
#endif
for ( q = ModuleInfo.g.PubQueue.head; q; q = q->next ) {
p2 += Mangle( q->sym, p2 ) + 1;
}
#if ADDSTARTLABEL
if ( ModuleInfo.g.start_label ) {
Mangle( ModuleInfo.g.start_label, p2 );
}
#endif
DebugMsg(("set_symtab_values: exit, symindex=%u\n", em->symindex ));
return;
}
/* set content + size of .shstrtab section.
* this section contains the names of all sections.
* three groups of sections are handled:
* - sections defined in the program
* - ELF internal sections
* - relocation sections
* alloc .shstrtab
*/
static void set_shstrtab_values( struct elfmod *em )
/**************************************************/
{
int i;
struct dsym *curr;
char *p;
unsigned int size = 1; /* the first byte at offset 0 is the NULL section name */
char buffer[MAX_ID_LEN+1];
/* get size of section names defined in the program & relocation sections ) */
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next ) {
/* v2.07: ALIAS name defined? */
p = ( curr->e.seginfo->aliasname ? curr->e.seginfo->aliasname : ElfConvertSectionName( &curr->sym, buffer ) );
size += strlen( p ) + 1;
if ( curr->e.seginfo->FixupList.head )
size += strlen( p ) +
#if AMD64_SUPPORT
(( ModuleInfo.defOfssize == USE64 ) ? sizeof(".rela") : sizeof(".rel"));
#else
sizeof(".rel");
#endif
}
/* get internal section name sizes */
for ( i = 0; i < NUM_INTSEGS; i++ ) {
size += strlen( internal_segparms[i].name ) + 1;
}
em->internal_segs[SHSTRTAB_IDX].size = size;
/* size is known, now alloc .shstrtab data buffer and fill it */
em->internal_segs[SHSTRTAB_IDX].data = LclAlloc( size );
p = (char *)em->internal_segs[SHSTRTAB_IDX].data;
*p++ = NULLC; /* NULL section name */
/* 1. names of program sections */
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next ) {
strcpy( p, curr->e.seginfo->aliasname ? curr->e.seginfo->aliasname : ElfConvertSectionName( &curr->sym, buffer ) );
p += strlen( p ) + 1;
}
/* 2. names of internal sections */
for ( i = 0; i < NUM_INTSEGS; i++ ) {
strcpy( p, internal_segparms[i].name );
p += strlen( p ) + 1;
}
/* 3. names of "relocation" sections */
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next ) {
if ( curr->e.seginfo->FixupList.head ) {
#if AMD64_SUPPORT
strcpy( p, (( ModuleInfo.defOfssize == USE64 ) ? ".rela": ".rel") );
#else
strcpy( p, ".rel" );
#endif
p += strlen( p );
strcpy( p, curr->e.seginfo->aliasname ? curr->e.seginfo->aliasname : ElfConvertSectionName( &curr->sym, buffer ) );
p += strlen( p ) + 1;
}
}
/**/myassert( size == p - (char *)em->internal_segs[SHSTRTAB_IDX].data );
DebugMsg(("set_shstrtab_values: size=%X\n", size));
return;
}
static unsigned int get_relocation_count( struct dsym *curr )
/***********************************************************/
{
unsigned relocs;
struct fixup *fix;
for ( relocs = 0, fix = curr->e.seginfo->FixupList.head; fix ; fix = fix->nextrlc, relocs++ );
return( relocs );
}
static unsigned int Get_Alignment( struct dsym *curr )
/****************************************************/
{
if ( curr->e.seginfo->alignment == MAX_SEGALIGNMENT )
return( 0 );
return( 1 << curr->e.seginfo->alignment );
}
/* write ELF32 section table.
* fileoffset: start of section data ( behind elf header and section table )
* there are 3 groups of sections to handle:
* - the sections defined in the module
* - the internal ELF sections ( .shstrtab, .symtab, .strtab )
* - the 'relocation' sections
*/
static int elf_write_section_table32( struct module_info *modinfo, struct elfmod *em, uint_32 fileoffset )
/********************************************************************************************************/
{
int i;
struct dsym *curr;
uint_8 *p;
//uint_32 fileoffset;
Elf32_Shdr shdr32;
DebugMsg(("elf_write_section_table32( fileofs=%X ): enter\n", fileoffset ));
//fileoffset = sizeof(Elf64_Ehdr) + ehdr->e_shnum * ehdr->e_shentsize;
fileoffset = (fileoffset + 0xF) & ~0xF;
/* set contents and size of internal .shstrtab section */
set_shstrtab_values( em );
/* write the NULL entry */
memset( &shdr32, 0, sizeof( shdr32) );
if ( fwrite( &shdr32, 1, sizeof(shdr32), CurrFile[OBJ] ) != sizeof(shdr32) ) /* write the empty NULL entry */
WriteError();
/* use p to scan strings (=section names) of .shstrtab */
p = (uint_8 *)em->internal_segs[SHSTRTAB_IDX].data;
p++; /* skip 'name' of NULL entry */
/* write the section headers defined in the module, */
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next ) {
memset( &shdr32, 0, sizeof(shdr32) );
shdr32.sh_name = p - (uint_8 *)em->internal_segs[SHSTRTAB_IDX].data;
p += strlen( (char *)p ) + 1;
if ( curr->e.seginfo->info == TRUE ) { /* v2.07:added; v2.12: highest priority */
shdr32.sh_type = SHT_NOTE;
shdr32.sh_flags = 0;
} else {
shdr32.sh_type = ( curr->e.seginfo->segtype != SEGTYPE_BSS ? SHT_PROGBITS : SHT_NOBITS );
if ( curr->e.seginfo->segtype == SEGTYPE_CODE ) {
shdr32.sh_flags = SHF_EXECINSTR | SHF_ALLOC;
} else if ( curr->e.seginfo->readonly == TRUE ) {
shdr32.sh_flags = SHF_ALLOC;
} else if ( curr->e.seginfo->clsym && strcmp( curr->e.seginfo->clsym->name, "CONST" ) == 0 ) {
shdr32.sh_flags = SHF_ALLOC; /* v2.07: added */
} else {
shdr32.sh_flags = SHF_WRITE | SHF_ALLOC;
}
}
#if 0
/* todo: translate values in field <characteristics> to
* elf section flags.
*/
if ( curr->e.seginfo->characteristics == ??? ) {
}
#endif
shdr32.sh_addr = 0;
/* v2.12: the sh_offset field holds the file position, even for SHT_NOBITS */
//if ( shdr32.sh_type != SHT_NOBITS ) {
shdr32.sh_offset = fileoffset; /* start of section in file */
curr->e.seginfo->fileoffset = fileoffset; /* save the offset in the segment */
//}
/* v2.07: set size for all sections, including .bss */
shdr32.sh_size = curr->sym.max_offset;
shdr32.sh_link = 0;
shdr32.sh_info = 0;
shdr32.sh_addralign = Get_Alignment( curr );
shdr32.sh_entsize = 0;
if ( fwrite( &shdr32, 1, sizeof(shdr32), CurrFile[OBJ] ) != sizeof(shdr32) )
WriteError();
curr->e.seginfo->num_relocs = get_relocation_count( curr );
/* v2.12: don't adjust fileoffset for SHT_NOBITS sections.
* it didn't cause fatal damage previously, but made the
* object module unnecessary large.
*/
if ( shdr32.sh_type != SHT_NOBITS ) {
fileoffset += shdr32.sh_size;
fileoffset = (fileoffset + 0xF) & ~0xF;
}
DebugMsg(("elf_write_section_table32(%s): ofs=%X size=%X numrelocs=%u\n", curr->sym.name, shdr32.sh_offset, shdr32.sh_size, curr->e.seginfo->num_relocs));
}
/* set size and contents of .symtab and .strtab sections */
set_symtab_values( em );
/* write headers of internal sections */
for ( i = 0; i < NUM_INTSEGS; i++ ) {
shdr32.sh_name = p - (uint_8 *)em->internal_segs[SHSTRTAB_IDX].data;
p += strlen( (char *)p ) + 1;
shdr32.sh_type = internal_segparms[i].type;
shdr32.sh_flags = 0;
shdr32.sh_offset = fileoffset; /* start of section in file */
em->internal_segs[i].fileoffset = fileoffset;
shdr32.sh_size = em->internal_segs[i].size;
/* section .symtab is special */
if ( i == SYMTAB_IDX ) {
shdr32.sh_link = 1 + modinfo->g.num_segs + STRTAB_IDX;
shdr32.sh_info = em->start_globals;
shdr32.sh_addralign = 4;
shdr32.sh_entsize = sizeof( Elf32_Sym );
} else {
shdr32.sh_link = 0;
shdr32.sh_info = 0;
shdr32.sh_addralign = 1;
shdr32.sh_entsize = 0;
}
if ( fwrite( &shdr32, 1, sizeof( shdr32 ), CurrFile[OBJ] ) != sizeof( shdr32 ) )
WriteError();
fileoffset += shdr32.sh_size;
fileoffset = (fileoffset + 0xF) & ~0xF;
DebugMsg(("elf_write_section_table32(%s): ofs=%X size=%X\n", internal_segparms[i].name, shdr32.sh_offset, shdr32.sh_size));
}
/* write headers of reloc sections */
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next ) {
if ( curr->e.seginfo->FixupList.head == NULL )
continue;
memset( &shdr32, 0, sizeof( shdr32 ) );
shdr32.sh_name = p - (uint_8 *)em->internal_segs[SHSTRTAB_IDX].data;
p += strlen( (char *)p ) + 1;
shdr32.sh_type = SHT_REL;
shdr32.sh_flags = 0;
shdr32.sh_addr = 0;
shdr32.sh_offset = fileoffset; /* start of section in file */
/* save the file offset in the slot reserved for ELF relocs */
curr->e.seginfo->reloc_offset = fileoffset;
/* size of section in file */
shdr32.sh_size = curr->e.seginfo->num_relocs * sizeof( Elf32_Rel );
shdr32.sh_link = 1 + modinfo->g.num_segs + SYMTAB_IDX;
/* set info to the src section index */
shdr32.sh_info = GetSegIdx( curr->sym.segment );
shdr32.sh_addralign = 4;
shdr32.sh_entsize = sizeof( Elf32_Rel );
if ( fwrite( &shdr32, 1, sizeof( shdr32 ), CurrFile[OBJ] ) != sizeof( shdr32 ) )
WriteError();
fileoffset += shdr32.sh_size;
fileoffset = (fileoffset + 0xF) & ~0xF;
DebugMsg(("elf_write_section_table32(%s): relocs, ofs=%X size=%X\n", curr->sym.name, shdr32.sh_offset, shdr32.sh_size));
}
DebugMsg(("elf_write_section_table32: exit, final fileofs=%X\n", fileoffset ));
return( NOT_ERROR );
}
#if AMD64_SUPPORT
/* write ELF64 section table. */
static int elf_write_section_table64( struct module_info *modinfo, struct elfmod *em, uint_32 fileoffset )
/********************************************************************************************************/
{
int i;
struct dsym *curr;
uint_8 *p;
//uint_32 fileoffset;
Elf64_Shdr shdr64;
DebugMsg(("elf_write_section_table64( fileofs=%X ): enter\n", fileoffset ));
//fileoffset = sizeof(Elf64_Ehdr) + ehdr->e_shnum * ehdr->e_shentsize;
fileoffset = (fileoffset + 0xF) & ~0xF;
/* set contents and size of internal .shstrtab section */
set_shstrtab_values( em );
/* write the NULL entry */
memset( &shdr64, 0, sizeof( shdr64) );
if ( fwrite( &shdr64, 1, sizeof(shdr64), CurrFile[OBJ] ) != sizeof(shdr64) ) /* write the empty NULL entry */
WriteError();
/* use p to scan strings (=section names) of .shstrtab */
p = (uint_8 *)em->internal_segs[SHSTRTAB_IDX].data;
p++; /* skip 'name' of NULL entry */
/* write the section headers defined in the module */
for( curr = SymTables[TAB_SEG].head; curr; curr = curr->next ) {
memset( &shdr64, 0, sizeof(shdr64) );
shdr64.sh_name = p - (uint_8 *)em->internal_segs[SHSTRTAB_IDX].data;
p += strlen( (char *)p ) + 1;
if ( curr->e.seginfo->info == TRUE ) { /* v2.07:added; v2.12: highest priority */
shdr64.sh_type = SHT_NOTE;
shdr64.sh_flags = 0;
} else {
shdr64.sh_type = ( curr->e.seginfo->segtype != SEGTYPE_BSS ? SHT_PROGBITS : SHT_NOBITS );
if ( curr->e.seginfo->segtype == SEGTYPE_CODE ) {
shdr64.sh_flags = SHF_EXECINSTR | SHF_ALLOC;
} else if ( curr->e.seginfo->readonly == TRUE ) {
shdr64.sh_flags = SHF_ALLOC;
} else if ( curr->e.seginfo->clsym && strcmp( curr->e.seginfo->clsym->name, "CONST" ) == 0 ) {
shdr64.sh_flags = SHF_ALLOC; /* v2.07: added */
} else {
shdr64.sh_flags = SHF_WRITE | SHF_ALLOC;
}
}
#if 0
/* todo: translate values in field <characteristics> to
* elf section flags.
*/
if ( curr->e.seginfo->characteristics == ??? ) {
}
#endif
shdr64.sh_addr = 0;
/* v2.12: the sh_offset field holds the file position, even for SHT_NOBITS */
//if ( shdr64.sh_type != SHT_NOBITS ) {
shdr64.sh_offset = fileoffset; /* start of section in file */
curr->e.seginfo->fileoffset = fileoffset; /* save the offset in the segment */
//}
/* v2.07: set size for all sections, including .bss */
shdr64.sh_size = curr->sym.max_offset;
shdr64.sh_link = 0;
shdr64.sh_info = 0;
shdr64.sh_addralign = Get_Alignment( curr );
shdr64.sh_entsize = 0;
if ( fwrite( &shdr64, 1, sizeof(shdr64), CurrFile[OBJ] ) != sizeof(shdr64) )
WriteError();
curr->e.seginfo->num_relocs = get_relocation_count( curr );