/* 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. */ /* Synched up with: FSF 19.31. */ /* Written by Leonard N. Zubkoff. */ #include #include #include #include #include #include #include #include #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; } }