mirror of
git://git.sv.gnu.org/emacs.git
synced 2025-12-29 00:31:01 -08:00
300 lines
11 KiB
C
300 lines
11 KiB
C
/* unexapollo.c -- COFF File UNEXEC for GNU Emacs on Apollo SR10.x
|
||
Copyright (C) 1988, 1994 Free Software Foundation, Inc.
|
||
|
||
This file is part of GNU Emacs.
|
||
|
||
GNU Emacs is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2, or (at your option)
|
||
any later version.
|
||
|
||
GNU Emacs 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 General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with GNU Emacs; see the file COPYING. If not, write to
|
||
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
/* Written by Leonard N. Zubkoff. */
|
||
|
||
#ifdef HAVE_CONFIG_H
|
||
#include <config.h>
|
||
#endif
|
||
|
||
#include <fcntl.h>
|
||
|
||
|
||
#include <a.out.h>
|
||
#include <sys/file.h>
|
||
#include <apollo/base.h>
|
||
#include <apollo/ios.h>
|
||
#include <apollo/type_uids.h>
|
||
#include <apollo/dst.h>
|
||
|
||
|
||
#define DST_RECORD_HDR_SIZE 2
|
||
#define LONG_ALIGN(X) (((X)+3)&(~3))
|
||
|
||
|
||
void
|
||
unexec (target_file_name, source_file_name)
|
||
char *target_file_name, *source_file_name;
|
||
{
|
||
struct filehdr file_header;
|
||
struct aouthdr domain_header;
|
||
struct scnhdr *section, *sections, *sections_limit;
|
||
struct scnhdr *first_data_section, *last_data_section;
|
||
struct scnhdr *rwdi_section, *blocks_section;
|
||
struct reloc reloc_entry;
|
||
unsigned long data_size, old_data_section_size, source_file_offset_past_rwdi;
|
||
unsigned char buffer[4096];
|
||
long delta_before_rwdi, delta_after_rwdi, byte_count;
|
||
long first_changed_vaddr, old_rwdi_vaddr, i;
|
||
ios_$id_t target_file, source_file;
|
||
status_$t status;
|
||
/* Open the Source File. */
|
||
if ((source_file = open (source_file_name, O_RDONLY)) < 0)
|
||
error ("cannot open source file for input");
|
||
/* Read the File Header. */
|
||
if (read (source_file, &file_header, sizeof (file_header)) != sizeof (file_header))
|
||
error ("cannot read file header");
|
||
|
||
/* Read the Domain Header. */
|
||
if (read (source_file, &domain_header, sizeof (domain_header))
|
||
!= sizeof (domain_header))
|
||
error ("cannot read domain header");
|
||
/* Read the Section Headers. */
|
||
sections =
|
||
(struct scnhdr *) malloc (file_header.f_nscns*sizeof (struct scnhdr));
|
||
if (sections == (struct scnhdr *) 0)
|
||
error ("cannot allocate section header storage");
|
||
sections_limit = sections + file_header.f_nscns;
|
||
if (read (source_file, sections, file_header.f_nscns*sizeof (struct scnhdr))
|
||
!= file_header.f_nscns*sizeof (struct scnhdr))
|
||
error ("cannot read section headers");
|
||
/* Compute the new Size of the Data Section. */
|
||
data_size = sbrk (0) - domain_header.data_start;
|
||
delta_before_rwdi = delta_after_rwdi = data_size - domain_header.dsize;
|
||
old_rwdi_vaddr = 0;
|
||
/* Find and Deallocate the .rwdi Section Information. */
|
||
for (rwdi_section = sections; rwdi_section != sections_limit; rwdi_section++)
|
||
if (strcmp (rwdi_section->s_name, ".rwdi") == 0)
|
||
{
|
||
/* If there are relocation entries, we cannot "unrelocate" them. */
|
||
if (rwdi_section->s_nreloc > 0)
|
||
error (".rwdi section needs relocation - cannot dump Emacs");
|
||
delta_after_rwdi = delta_before_rwdi - rwdi_section->s_size;
|
||
old_rwdi_vaddr = rwdi_section->s_vaddr;
|
||
rwdi_section->s_paddr = 0;
|
||
rwdi_section->s_vaddr = 0;
|
||
rwdi_section->s_scnptr = 0;
|
||
rwdi_section->s_size = 0;
|
||
source_file_offset_past_rwdi = (rwdi_section+1)->s_scnptr;
|
||
break;
|
||
}
|
||
/* Skip over the Text Section Headers. */
|
||
for (section = sections; (section->s_flags & STYP_TEXT) != 0; section++) ;
|
||
/*
|
||
Find the First and Last Data Sections and Fixup
|
||
Section Header Relocation Pointers.
|
||
*/
|
||
first_data_section = last_data_section = (struct scnhdr *) 0;
|
||
for (; section != sections_limit; section++)
|
||
{
|
||
if ((section->s_flags & STYP_DATA) != 0)
|
||
{
|
||
if (first_data_section == (struct scnhdr *) 0)
|
||
first_data_section = section;
|
||
last_data_section = section;
|
||
}
|
||
if (section->s_relptr != 0)
|
||
section->s_relptr += delta_after_rwdi;
|
||
}
|
||
/* Increment the Size of the Last Data Section. */
|
||
old_data_section_size = last_data_section->s_size;
|
||
last_data_section->s_size += delta_before_rwdi;
|
||
|
||
/* Update the File Header and Domain Header. */
|
||
file_header.f_symptr += delta_after_rwdi;
|
||
domain_header.dsize = data_size;
|
||
domain_header.bsize = 0;
|
||
/* Skip over subsequent Bss Section Headers. */
|
||
for (section = last_data_section+1;
|
||
(section->s_flags & STYP_BSS) != 0; section++) ;
|
||
/* Update the remaining Section Headers. */
|
||
blocks_section = (struct scnhdr *) 0;
|
||
first_changed_vaddr = 0;
|
||
for (; section != sections_limit; section++)
|
||
{
|
||
long delta = (section < rwdi_section ? delta_before_rwdi : delta_after_rwdi);
|
||
if (section->s_paddr != 0)
|
||
section->s_paddr += delta;
|
||
if (section->s_vaddr != 0)
|
||
{
|
||
if (first_changed_vaddr == 0)
|
||
first_changed_vaddr = section->s_vaddr;
|
||
section->s_vaddr += delta;
|
||
}
|
||
if (section->s_scnptr != 0)
|
||
section->s_scnptr += delta;
|
||
if (strcmp (section->s_name, ".blocks") == 0)
|
||
blocks_section = section;
|
||
else if (strcmp (section->s_name, ".sri") == 0 &&
|
||
domain_header.o_sri != 0)
|
||
domain_header.o_sri += delta;
|
||
else if (strcmp (section->s_name, ".inlib") == 0 &&
|
||
domain_header.o_inlib != 0)
|
||
domain_header.o_inlib += delta;
|
||
}
|
||
/* Open the Target File. */
|
||
ios_$create (target_file_name, strlen (target_file_name), coff_$uid,
|
||
ios_$recreate_mode, ios_$write_opt, &target_file, &status);
|
||
if (status.all != status_$ok)
|
||
error ("cannot open target file for output");
|
||
/* Write the File Header. */
|
||
if (write (target_file, &file_header, sizeof (file_header)) != sizeof (file_header))
|
||
error ("cannot write file header");
|
||
/* Write the Domain Header. */
|
||
if (write (target_file, &domain_header, sizeof (domain_header))
|
||
!= sizeof (domain_header))
|
||
error ("cannot write domain header");
|
||
/* Write the Section Headers. */
|
||
if (write (target_file, sections, file_header.f_nscns*sizeof (struct scnhdr))
|
||
!= file_header.f_nscns*sizeof (struct scnhdr))
|
||
error ("cannot write section headers");
|
||
/* Copy the Allocated Sections. */
|
||
for (section = sections; section != first_data_section; section++)
|
||
if (section->s_scnptr != 0)
|
||
CopyData (target_file, source_file, LONG_ALIGN(section->s_size));
|
||
/* Write the Expanded Data Segment. */
|
||
if (write (target_file, first_data_section->s_vaddr, data_size) != data_size)
|
||
error ("cannot write new data section");
|
||
|
||
/* Skip over the Last Data Section and Copy until the .rwdi Section. */
|
||
if (lseek (source_file, last_data_section->s_scnptr
|
||
+old_data_section_size, L_SET) == -1)
|
||
error ("cannot seek past data section");
|
||
for (section = last_data_section+1; section != rwdi_section; section++)
|
||
if (section->s_scnptr != 0)
|
||
CopyData (target_file, source_file, LONG_ALIGN(section->s_size));
|
||
/* Skip over the .rwdi Section and Copy Remainder of Source File. */
|
||
if (lseek (source_file, source_file_offset_past_rwdi, L_SET) == -1)
|
||
error ("cannot seek past .rwdi section");
|
||
while ((byte_count = read (source_file, buffer, sizeof (buffer))) > 0)
|
||
if (write (target_file, buffer, byte_count) != byte_count)
|
||
error ("cannot write data");
|
||
/* Unrelocate .data references to Global Symbols. */
|
||
for (section = first_data_section; section <= last_data_section; section++)
|
||
for (i = 0; i < section->s_nreloc; i++)
|
||
{
|
||
if (lseek (source_file, section->s_relptr
|
||
+i*sizeof (struct reloc)-delta_after_rwdi, L_SET) == -1)
|
||
error ("cannot seek to relocation info");
|
||
if (read (source_file, &reloc_entry, sizeof (reloc_entry))
|
||
!= sizeof (reloc_entry))
|
||
error ("cannot read reloc entry");
|
||
if (lseek (source_file, reloc_entry.r_vaddr-section->s_vaddr
|
||
+section->s_scnptr, L_SET) == -1)
|
||
error ("cannot seek to data element");
|
||
if (lseek (target_file, reloc_entry.r_vaddr-section->s_vaddr
|
||
+section->s_scnptr, L_SET) == -1)
|
||
error ("cannot seek to data element");
|
||
if (read (source_file, buffer, 4) != 4)
|
||
error ("cannot read data element");
|
||
if (write (target_file, buffer, 4) != 4)
|
||
error ("cannot write data element");
|
||
}
|
||
|
||
/* Correct virtual addresses in .blocks section. */
|
||
if (blocks_section != (struct scnhdr *) 0)
|
||
{
|
||
dst_rec_t dst_record;
|
||
dst_rec_comp_unit_t *comp_unit;
|
||
unsigned short number_of_sections;
|
||
unsigned long section_base;
|
||
unsigned long section_offset = 0;
|
||
/* Find section tables and update section base addresses. */
|
||
while (section_offset < blocks_section->s_size)
|
||
{
|
||
if (lseek (target_file,
|
||
blocks_section->s_scnptr+section_offset, L_SET) == -1)
|
||
error ("cannot seek to comp unit record");
|
||
/* Handle pad records before the comp unit record. */
|
||
if (read (target_file, &dst_record, DST_RECORD_HDR_SIZE)
|
||
!= DST_RECORD_HDR_SIZE)
|
||
error ("cannot read dst record tag");
|
||
if (dst_record.rec_type == dst_typ_pad)
|
||
section_offset += DST_RECORD_HDR_SIZE;
|
||
else if (dst_record.rec_type == dst_typ_comp_unit)
|
||
{
|
||
comp_unit = &dst_record.rec_data.comp_unit_;
|
||
if (read (target_file, comp_unit, sizeof (*comp_unit))
|
||
!= sizeof (*comp_unit))
|
||
error ("cannot read comp unit record");
|
||
if (lseek (target_file, blocks_section->s_scnptr
|
||
+section_offset
|
||
#if dst_version_major == 1 && dst_version_minor < 4
|
||
+comp_unit->section_table
|
||
#else
|
||
+comp_unit->section_table.rel_offset
|
||
#endif
|
||
+DST_RECORD_HDR_SIZE,
|
||
L_SET) == -1)
|
||
error ("cannot seek to section table");
|
||
if (read (target_file, &number_of_sections, sizeof (number_of_sections))
|
||
!= sizeof (number_of_sections))
|
||
error ("cannot read section table size");
|
||
for (i = 0; i < number_of_sections; i++)
|
||
{
|
||
if (read (target_file, §ion_base, sizeof (section_base))
|
||
!= sizeof (section_base))
|
||
error ("cannot read section base value");
|
||
if (section_base < first_changed_vaddr)
|
||
continue;
|
||
else if (section_base < old_rwdi_vaddr)
|
||
section_base += delta_before_rwdi;
|
||
else section_base += delta_after_rwdi;
|
||
if (lseek (target_file, -sizeof (section_base), L_INCR) == -1)
|
||
error ("cannot seek to section base value");
|
||
if (write (target_file, §ion_base, sizeof (section_base))
|
||
!= sizeof (section_base))
|
||
error ("cannot write section base");
|
||
}
|
||
section_offset += comp_unit->data_size;
|
||
}
|
||
else error ("unexpected dst record type");
|
||
}
|
||
}
|
||
|
||
if (close (source_file) == -1)
|
||
error("cannot close source file");
|
||
if (close (target_file) == -1)
|
||
error ("cannot close target file");
|
||
}
|
||
|
||
|
||
static
|
||
CopyData (target_file, source_file, total_byte_count)
|
||
int target_file, source_file;
|
||
long total_byte_count;
|
||
{
|
||
unsigned char buffer[4096];
|
||
long byte_count;
|
||
while (total_byte_count > 0)
|
||
{
|
||
if (total_byte_count > sizeof (buffer))
|
||
byte_count = sizeof (buffer);
|
||
else byte_count = total_byte_count;
|
||
if (read (source_file, buffer, byte_count) != byte_count)
|
||
error ("cannot read data");
|
||
if (write (target_file, buffer, byte_count) != byte_count)
|
||
error ("cannot write data");
|
||
total_byte_count -= byte_count;
|
||
}
|
||
}
|
||
|
||
/* arch-tag: 783ebbdf-7d26-4df8-9469-17a1747dce96
|
||
(do not change this comment) */
|