[Emacs-diffs] Changes to emacs/src/unexapollo.c [lexbind]

[Miles Bader]

Index: emacs/src/unexapollo.c
diff -c /dev/null emacs/src/unexapollo.c:1.2.4.1
*** /dev/null   Tue Oct 14 19:23:26 2003
--- emacs/src/unexapollo.c      Tue Oct 14 19:22:47 2003
***************
*** 0 ****
--- 1,300 ----
+ /* 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, &section_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, &section_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) */