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aout.c
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aout.c
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/******************************************************************************
* @file aout.c
*****************************************************************************/
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "aout.h"
#include "ld.h"
#include "lib.h"
#include "map.h"
#include "msdos.h"
#include "report.h"
#include "types.h"
#include "write7x.h"
static struct aout_exec *aout_hdr;
static struct msdos_header *msdos_hdr;
static unsigned long header_size = 0, output_size = 0;
static void *data = 0, *output = 0, *text = 0;
struct gr {
int32_t relocations_count;
int32_t relocations_max;
struct relocation_info *relocations;
};
static struct gr tgr = { 0, 64, NULL };
static struct gr dgr = { 0, 64, NULL };
static int get_symbol (struct aout_object **obj_out, int32_t *index, const char *name, int quiet) {
long object_i;
int32_t symbol_i;
for (object_i = 0; object_i < state->nb_aout_objs; ++object_i) {
struct aout_object *obj = state->aout_objs[object_i];
for (symbol_i = 0; symbol_i < obj->symtab_count; symbol_i++) {
struct nlist *sym = &obj->symtab[symbol_i];
char *symname = obj->strtab + GET_INT32 (sym->n_strx);
if ((sym->n_type & N_EXT) == 0) {
continue;
}
if ((sym->n_type & N_TYPE) != N_TEXT && (sym->n_type & N_TYPE) != N_DATA && (sym->n_type & N_TYPE) != N_BSS && (sym->n_type & N_TYPE) != N_ABS) {
continue;
}
if (strcmp (symname, name) == 0) {
if (obj_out) {
*obj_out = obj;
}
if (index) {
*index = symbol_i;
}
return 0;
}
}
}
if (!quiet) {
report_at (program_name, 0, REPORT_ERROR, "undefined symbol '%s'", name);
}
return 1;
}
static uint32_t get_entry (void) {
struct aout_object *symobj;
int32_t symidx;
if (!state->entry || strcmp (state->entry, "") == 0) {
state->entry = "_start";
}
if (get_symbol (&symobj, &symidx, state->entry, 1)) {
report_at (program_name, 0, REPORT_WARNING, "cannot find entry symbol %s; defaulting to 00000000", state->entry);
return 0;
}
return GET_UINT32 (symobj->symtab[symidx].n_value);
}
static void number_to_chars (unsigned char *p, unsigned long number, unsigned long size) {
unsigned long i;
for (i = 0; i < size; i++) {
p[i] = (number >> (8 * i)) & 0xff;
}
}
static unsigned long fix_offset (struct relocation_info r, unsigned long result) {
uint32_t zapdata = ((char *) text - (char *) output);
if (((GET_UINT32 (r.r_symbolnum) >> 24) & 0xff) != N_TEXT) {
return result;
}
result += zapdata;
if (state->format == LD_FORMAT_I386_PE) {
uint32_t data_offset = ((char *) data - (char *) output);
if (result >= data_offset) {
result += ALIGN_UP (zapdata, SECTION_ALIGNMENT);
result += ALIGN_UP (state->text_size, SECTION_ALIGNMENT);
result -= zapdata;
} else {
result += ALIGN_UP (zapdata, SECTION_ALIGNMENT);
}
result -= zapdata;
}
return result;
}
static void fix_offsets (void) {
uint32_t zapdata = ((char *) text - (char *) output);
int32_t i, length;
for (i = 0; i < tgr.relocations_count; i++) {
struct relocation_info *r = &tgr.relocations[i];
unsigned char *p = (unsigned char *) text + GET_INT32 (r->r_address);
uint32_t orig = 0;
if (((GET_UINT32 (r->r_symbolnum) >> 24) & 0xff) != N_TEXT) {
continue;
}
length = (GET_UINT32 (r->r_symbolnum) & (3L << 25)) >> 25;
switch (length) {
case 0:
length = 1;
break;
case 1:
length = 2;
break;
case 2:
length = 4;
break;
}
if (*(p - 1) == 0x9A) {
uint32_t temp = *(int32_t *) p;
orig = ((temp >> 16) & 0xffff) * 16;
orig += temp & 0xffff;
} else {
memcpy (&orig, p, length);
}
orig += zapdata;
if (state->format == LD_FORMAT_I386_PE) {
uint32_t data_offset = ((char *) data - (char *) output);
if (orig >= data_offset) {
orig += ALIGN_UP (zapdata, SECTION_ALIGNMENT);
orig += ALIGN_UP (state->text_size, SECTION_ALIGNMENT);
orig -= zapdata;
} else {
orig += ALIGN_UP (zapdata, SECTION_ALIGNMENT);
}
orig -= zapdata;
}
if (*(p - 1) == 0x9A) {
number_to_chars (p, orig % 16, 2);
number_to_chars (p + 2, orig / 16, 2);
} else {
memcpy (p, &orig, length);
}
}
for (i = 0; i < dgr.relocations_count; i++) {
struct relocation_info *r = &dgr.relocations[i];
uint32_t orig = 0;
if (((GET_UINT32 (r->r_symbolnum) >> 24) & 0xff) != N_TEXT) {
continue;
}
length = (GET_UINT32 (r->r_symbolnum) & (3L << 25)) >> 25;
switch (length) {
case 0:
length = 1;
break;
case 1:
length = 2;
break;
case 2:
length = 4;
break;
}
memcpy (&orig, ((char *) data + GET_INT32 (r->r_address)), length);
orig += zapdata;
if (state->format == LD_FORMAT_I386_PE) {
uint32_t data_offset = ((char *) data - (char *) output);
if (orig >= data_offset) {
orig += ALIGN_UP (zapdata, SECTION_ALIGNMENT);
orig += ALIGN_UP (state->text_size, SECTION_ALIGNMENT);
orig -= zapdata;
} else {
orig += ALIGN_UP (zapdata, SECTION_ALIGNMENT);
}
orig -= zapdata;
}
memcpy ((char *) data + GET_INT32 (r->r_address), &orig, length);
}
}
static int32_t objtextsize = 0, objdatasize = 0, objbsssize = 0;
static uint32_t text_ptr = 0, data_ptr = 0, bss_ptr = 0;
static void apply_slides (struct aout_object *object) {
int32_t i;
for (i = 0; i < object->symtab_count; i++) {
struct nlist *symbol = &object->symtab[i];
uint32_t final_slide = 0, n_value = GET_UINT32 (symbol->n_value);
if ((symbol->n_type & N_TYPE) != N_TEXT && (symbol->n_type & N_TYPE) != N_DATA && (symbol->n_type & N_TYPE) != N_BSS) {
continue;
}
switch (symbol->n_type & N_TYPE) {
case N_BSS:
final_slide += state->text_size;
final_slide += state->data_size;
final_slide += object->bss_slide;
break;
case N_DATA:
final_slide += state->text_size;
final_slide += object->data_slide;
break;
case N_TEXT:
final_slide += object->text_slide;
break;
}
n_value += final_slide;
switch (symbol->n_type & N_TYPE) {
case N_BSS:
n_value -= GET_UINT32 (object->header->a_data);
/* fall through */
case N_DATA:
n_value -= GET_UINT32 (object->header->a_text);
break;
}
write741_to_byte_array (symbol->n_value, n_value);
}
for (i = 0; i < object->trelocs_count; i++) {
struct relocation_info *rel = &object->trelocs[i];
int32_t r_address = GET_INT32 (rel->r_address);
r_address += object->text_slide;
write741_to_byte_array ((unsigned char *) rel->r_address, r_address);
}
for (i = 0; i < object->drelocs_count; i++) {
struct relocation_info *rel = &object->drelocs[i];
int32_t r_address = GET_INT32 (rel->r_address);
r_address += state->text_size + object->data_slide;
write741_to_byte_array ((unsigned char *) rel->r_address, r_address);
}
}
static void init_map (struct aout_object *object) {
int32_t symbol_i;
add_map_object (object->filename, GET_UINT32 (object->header->a_bss), GET_UINT32 (object->header->a_data), GET_UINT32 (object->header->a_text));
for (symbol_i = 0; symbol_i < object->symtab_count; symbol_i++) {
struct nlist *sym = &object->symtab[symbol_i];
char *symname = object->strtab + GET_INT32 (sym->n_strx);
if ((sym->n_type & N_TYPE) == N_UNDF) {
continue;
}
if (strcmp (symname, ".text") == 0 || strcmp (symname, ".data") == 0 || strcmp (symname, ".bss") == 0) {
continue;
}
if ((sym->n_type & N_TYPE) == N_TEXT) {
add_map_text_symbol (object->filename, xstrdup (symname), GET_UINT32 (sym->n_value));
} else if ((sym->n_type & N_TYPE) == N_DATA) {
add_map_data_symbol (object->filename, xstrdup (symname), GET_UINT32 (sym->n_value));
} else if ((sym->n_type & N_TYPE) == N_BSS) {
add_map_bss_symbol (object->filename, xstrdup (symname), GET_UINT32 (sym->n_value));
}
}
}
static void paste (struct aout_object *object) {
struct aout_exec *header = object->header;
char *obj_text, *obj_data;
uint32_t obj_text_size, obj_data_size, obj_bss_size;
object->text_slide = text_ptr;
obj_text = (char *) object->raw + sizeof (*header);
if (state->impure) {
obj_text_size = GET_UINT32 (header->a_text);
} else {
if (state->format == LD_FORMAT_I386_PE) {
obj_text_size = ALIGN_UP (GET_UINT32 (header->a_text), FILE_ALIGNMENT);
} else {
obj_text_size = ALIGN_UP (GET_UINT32 (header->a_text), SECTION_ALIGNMENT);
}
}
memcpy ((char *) text + text_ptr, obj_text, GET_UINT32 (header->a_text));
text_ptr += obj_text_size;
object->data_slide = data_ptr;
obj_data = (char *) object->raw + sizeof (*header) + GET_UINT32 (header->a_text);
if (state->impure) {
obj_data_size = GET_UINT32 (header->a_data);
} else {
if (state->format == LD_FORMAT_I386_PE) {
obj_data_size = ALIGN_UP (GET_UINT32 (header->a_data), FILE_ALIGNMENT);
} else {
obj_data_size = ALIGN_UP (GET_UINT32 (header->a_data), SECTION_ALIGNMENT);
}
}
memcpy ((char *) data + data_ptr, obj_data, GET_UINT32 (header->a_data));
data_ptr += obj_data_size;
object->bss_slide = bss_ptr;
if (state->impure) {
obj_bss_size = GET_UINT32 (header->a_bss);
} else {
if (state->format == LD_FORMAT_I386_PE) {
obj_bss_size = ALIGN_UP (GET_UINT32 (header->a_bss), FILE_ALIGNMENT);
} else {
obj_bss_size = ALIGN_UP (GET_UINT32 (header->a_bss), SECTION_ALIGNMENT);
}
}
bss_ptr += obj_bss_size;
}
static void undef_collect (struct aout_object *object) {
int32_t i, val;
for (i = 0; i < object->symtab_count; i++) {
struct nlist *sym = &object->symtab[i];
char *symname = object->strtab + GET_INT32 (sym->n_strx);
if ((sym->n_type & N_TYPE) != N_UNDF || GET_UINT32 (sym->n_value) == 0) {
continue;
}
if (get_symbol (NULL, NULL, symname, 1)) {
continue;
}
sym->n_type = N_BSS | N_EXT;
val = GET_UINT32 (sym->n_value);
write741_to_byte_array (sym->n_value, state->text_size + state->data_size + state->bss_size);
state->bss_size += val;
}
}
static int remove_relocation (struct gr *gr, struct relocation_info r) {
struct relocation_info *relocs;
int32_t i, j;
if (gr->relocations == NULL || gr->relocations_count == 0) {
return 0;
}
if ((relocs = malloc (gr->relocations_max * sizeof (*relocs))) == NULL) {
return 1;
}
for (i = 0, j = 0; i < gr->relocations_count; ++i) {
if (GET_INT32 (gr->relocations[i].r_address) == GET_INT32 (r.r_address) && GET_UINT32 (gr->relocations[i].r_symbolnum) == GET_UINT32 (r.r_symbolnum)) {
continue;
}
memcpy (&relocs[j++], &gr->relocations[i], sizeof (r));
}
free (gr->relocations);
gr->relocations = relocs;
gr->relocations_count = j;
return 0;
}
static int add_relocation (struct gr *gr, struct relocation_info *r) {
if (gr->relocations == NULL) {
if ((gr->relocations = malloc (gr->relocations_max * sizeof (*r))) == NULL) {
return 1;
}
}
if (gr->relocations_count >= gr->relocations_max) {
void *tmp;
gr->relocations_max *= 2;
if ((tmp = realloc (gr->relocations, gr->relocations_max * sizeof (*r))) == NULL) {
return 1;
}
gr->relocations = tmp;
}
gr->relocations[gr->relocations_count] = *r;
gr->relocations_count++;
return 0;
}
static int dgroup_cnt = 0;
static int relocate (struct aout_object *object, struct relocation_info *r, int is_data) {
struct nlist *symbol;
unsigned char *p;
int dgroup = 0, _end = 0, _edata = 0;
int32_t opcode, result = 0;
uint32_t r_symbolnum = GET_UINT32 (r->r_symbolnum);
int32_t symbolnum = r_symbolnum & 0xffffff;
int32_t pcrel = (r_symbolnum & (1L << 24)) >> 24;
int32_t ext = (r_symbolnum & (1L << 27)) >> 27;
int32_t baserel = (r_symbolnum & (1L << 28)) >> 28;
int32_t jmptable = (r_symbolnum & (1L << 29)) >> 29;
int32_t rel = (r_symbolnum & (1L << 30)) >> 30;
int32_t copy = (r_symbolnum & (1L << 31)) >> 31;
int32_t length = (r_symbolnum & (3L << 25)) >> 25;
switch (length) {
case 0:
length = 1;
break;
case 1:
length = 2;
break;
case 2:
length = 4;
break;
}
symbol = &object->symtab[symbolnum];
if ((is_data && pcrel) || baserel || jmptable || rel || copy) {
report_at (program_name, 0, REPORT_ERROR, "unsupported relocation type");
return 1;
}
p = (unsigned char *) output + header_size + GET_INT32 (r->r_address);
opcode = *(int32_t *) (p - 1) & 0xff;
if (ext) {
char *symname = object->strtab + GET_INT32 (symbol->n_strx);
char *temp = symname;
struct aout_object *symobj;
int32_t symidx;
if (!state->flat_bin && state->format != LD_FORMAT_I386_AOUT && strstart ("DGROUP", (const char **) &temp)) {
if (strcmp (temp, "__end") == 0) {
int32_t data_addr = ((char *) data - (char *) output) - header_size;
int32_t temp = ((char *) data - (char *) output);
temp += state->data_size;
temp += state->bss_size;
temp -= (data_addr & 0xfffffff0);
write741_to_byte_array (symbol->n_value, temp);
_end = 1;
} else if (strcmp (temp, "__edata") == 0) {
int32_t data_addr = ((char *) data - (char *) output) - header_size;
int32_t temp = ((char *) data - (char *) output);
temp += state->data_size;
temp -= (data_addr & 0xfffffff0);
write741_to_byte_array (symbol->n_value, temp);
_edata = 1;
} else {
result = ((char *) data - (char *) output);
result += state->code_offset;
dgroup_cnt++;
dgroup = 1;
}
} else if (!get_symbol (&symobj, &symidx, symname, 0)) {
symbol = &symobj->symtab[symidx];
} else {
return 1;
}
}
if (pcrel) {
if (result == 0) {
result = (long) GET_UINT32 (symbol->n_value) - (GET_INT32 (r->r_address) + length);
}
} else {
if (dgroup || !ext || (symbol->n_type & N_TYPE) == N_BSS || (symbol->n_type & N_TYPE) == N_DATA || (symbol->n_type & N_TYPE) == N_TEXT) {
struct relocation_info new_relocation;
int32_t r_address;
uint32_t r_symbolnum;
r_address = GET_INT32 (r->r_address);
if (!state->flat_bin && is_data && /*state->format == LD_FORMAT_I386_AOUT*/ state->format != LD_FORMAT_MSDOS_MZ) {
r_address -= state->text_size;
}
write741_to_byte_array ((unsigned char *) new_relocation.r_address, r_address);
if (dgroup) {
r_symbolnum = GET_UINT32 (r->r_symbolnum);
} else {
r_symbolnum = GET_UINT32 (r->r_symbolnum) & (3L << 25);
}
write741_to_byte_array (new_relocation.r_symbolnum, r_symbolnum);
add_relocation (is_data ? &dgr : &tgr, &new_relocation);
}
if (opcode == 0x9A && symbolnum == 4) {
uint32_t temp = *(int32_t *) ((char *) output + header_size + GET_INT32 (r->r_address));
result = ((temp >> 16) & 0xffff) * 16;
result += temp & 0xffff;
} else if (result == 0) {
int32_t r_address = GET_INT32 (r->r_address);
if (length == 4) {
result = *(int32_t *) ((char *) output + header_size + r_address);
} else if (length == 2) {
result = *(int16_t *) ((char *) output + header_size + r_address);
} else if (length == 1) {
result = *(int8_t *) ((char *) output + header_size + r_address);
}
}
if (ext || dgroup) {
if (ext) {
symbolnum = (symbol->n_type & N_TYPE);
result += GET_UINT32 (symbol->n_value);
if (state->format == LD_FORMAT_I386_AOUT || state->flat_bin) {
result += state->code_offset;
} else if (is_data && symbolnum == 4) {
result += state->code_offset;
}
}
} else {
if ((symbolnum == 6) || (symbolnum == 8)) {
result -= GET_UINT32 (object->header->a_text);
result += state->text_size;
}
if (symbolnum == 4) {
result += objtextsize;
}
if (symbolnum == 6) {
result += objdatasize;
}
if (symbolnum == 8) {
result -= GET_UINT32 (object->header->a_data);
result += state->data_size;
result += objbsssize;
}
if (state->format == LD_FORMAT_I386_AOUT || state->flat_bin) {
result += state->code_offset;
} else if (symbolnum == 4) {
result += state->code_offset;
}
}
}
if (opcode == 0x9A && symbolnum == 4) {
int32_t i;
if (result >= 65535) {
int32_t r_address = GET_INT32 (r->r_address);
if (state->format == LD_FORMAT_BINARY || state->format == LD_FORMAT_MSDOS) {
report_at (object->filename, GET_INT32 (r->r_address), REPORT_ERROR, "call exceeds 65535 bytes");
return 1;
}
number_to_chars (p, result % 16, 2);
number_to_chars (p + 2, result / 16, 2);
for (i = tgr.relocations_count - 1; i >= 0; --i) {
if (GET_INT32 (tgr.relocations[i].r_address) == r_address) {
write741_to_byte_array ((unsigned char *) tgr.relocations[i].r_address, r_address + 2);
}
}
} else {
result -= header_size;
/*if (state->format == LD_FORMAT_MSDOS_MZ) {*/
int32_t r_address = GET_INT32 (r->r_address) + 1;
write741_to_byte_array ((unsigned char *) r->r_address, r_address);
*(p - 1) = 0x0E;
for (i = tgr.relocations_count - 1; i >= 0; --i) {
if (GET_INT32 (tgr.relocations[i].r_address) + 1 == r_address) {
write741_to_byte_array ((unsigned char *) tgr.relocations[i].r_address, r_address);
result = fix_offset (tgr.relocations[i], result);
remove_relocation (&tgr, tgr.relocations[i]);
}
}
/*}*/
result -= GET_INT32 (r->r_address);
while (length-- > 2) { result--; }
number_to_chars (p + 1, result, 2);
number_to_chars (p, 0xE8, 1);
number_to_chars (p + 3, 0x90, 1);
}
} else if (dgroup) {
result -= header_size;
number_to_chars (p, result / 16, 2);
} else {
if (!state->flat_bin && !_end && !_edata && state->format != LD_FORMAT_I386_AOUT) {
int32_t data_addr = ((char *) data - (char *) output) - header_size;
int32_t i, r_address = GET_INT32 (r->r_address);
if (is_data && (symbolnum == 6 || symbolnum == 8)) {
int32_t temp = data_addr;
temp += state->code_offset;
number_to_chars (p + 2, temp / 16, 2);
if (result >= data_addr) {
result -= (data_addr & 0xfffffff0);
}
length = 2;
} else {
if (dgroup_cnt && (symbolnum == 6 || symbolnum == 8) && result >= data_addr) {
result -= (data_addr & 0xfffffff0);
}
for (i = tgr.relocations_count - 1; i >= 0; --i) {
if (GET_INT32 (tgr.relocations[i].r_address) == r_address) {
result = fix_offset (tgr.relocations[i], result);
remove_relocation (&tgr, tgr.relocations[i]);
}
}
}
}
number_to_chars (p, result, length);
}
return 0;
}
static int glue (struct aout_object *object) {
int32_t i, err = 0;
for (i = 0; i < object->trelocs_count; i++) {
if (relocate (object, &object->trelocs[i], 0)) {
err = 1;
}
}
for (i = 0; i < object->drelocs_count; i++) {
if (relocate (object, &object->drelocs[i], 1)) {
err = 1;
}
}
objtextsize += GET_UINT32 (object->header->a_text);
objdatasize += GET_UINT32 (object->header->a_data);
objbsssize += GET_UINT32 (object->header->a_bss);
return err;
}
static int init_aout_object (void) {
header_size = sizeof (*aout_hdr);
if (!state->impure) {
header_size = ALIGN_UP (header_size, SECTION_ALIGNMENT);
}
output_size = header_size + state->text_size + state->data_size;
if ((output = malloc (output_size)) == NULL) {
return 1;
}
memset (output, 0, output_size);
aout_hdr = output;
text = (void *) ((char *) output + header_size);
data = (void *) ((char *) text + state->text_size);
return 0;
}
static int write_aout_object (FILE *ofp, uint32_t a_entry) {
write741_to_byte_array (aout_hdr->a_info, state->impure ? OMAGIC : ZMAGIC);
write741_to_byte_array (aout_hdr->a_text, state->text_size);
write741_to_byte_array (aout_hdr->a_data, state->data_size);
write741_to_byte_array (aout_hdr->a_bss, state->bss_size);
write741_to_byte_array (aout_hdr->a_entry, a_entry);
write741_to_byte_array (aout_hdr->a_trsize, tgr.relocations_count * sizeof (struct relocation_info));
write741_to_byte_array (aout_hdr->a_drsize, dgr.relocations_count * sizeof (struct relocation_info));
if (fwrite ((char *) output, output_size, 1, ofp) != 1) {
report_at (program_name, 0, REPORT_ERROR, "failed to write data to '%s'", state->outfile);
return 1;
}
if (tgr.relocations_count > 0) {
if (fwrite (tgr.relocations, tgr.relocations_count * sizeof (struct relocation_info), 1, ofp) != 1) {
report_at (program_name, 0, REPORT_ERROR, "failed to write text relocations to '%s'", state->outfile);
return 1;
}
}
if (dgr.relocations_count > 0) {
if (fwrite (dgr.relocations, dgr.relocations_count * sizeof (struct relocation_info), 1, ofp) != 1) {
report_at (program_name, 0, REPORT_ERROR, "failed to write data relocations to '%s'", state->outfile);
return 1;
}
}
return 0;
}
static int init_msdos_mz_object (void) {
state->text_size = ALIGN_UP (state->text_size, 16);
state->data_size = ALIGN_UP (state->data_size, 16);
header_size = ALIGN_UP (sizeof (*msdos_hdr), 16);
output_size = header_size + state->text_size + state->data_size;
if ((output = malloc (output_size)) == NULL) {
return 1;
}
memset (output, 0, output_size);
msdos_hdr = output;
text = (void *) ((char *) output + header_size);
data = (void *) ((char *) text + state->text_size);
return 0;
}
static int write_msdos_mz_object (FILE *ofp, uint32_t entry) {
/*unsigned short ibss_addr = ((char *) output - (char *) text) + state->text_size;*/