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91b97ddb7e
(adjust_lnnoptrs): Handle include file names, mostly for dbx. (unrelocate_symbols): Remove some unnecessary tests.
883 lines
24 KiB
C
883 lines
24 KiB
C
/* Modified by Andrew.Vignaux@comp.vuw.ac.nz to get it to work :-) */
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/* Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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In other words, you are welcome to use, share and improve this program.
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You are forbidden to forbid anyone else to use, share and improve
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what you give them. Help stamp out software-hoarding! */
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/*
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* unexec.c - Convert a running program into an a.out file.
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*
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* Author: Spencer W. Thomas
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* Computer Science Dept.
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* University of Utah
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* Date: Tue Mar 2 1982
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* Modified heavily since then.
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*
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* Updated for AIX 4.1.3 by Bill_Mann @ PraxisInt.com, Feb 1996
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* As of AIX 4.1, text, data, and bss are pre-relocated by the binder in
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* such a way that the file can be mapped with code in one segment and
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* data/bss in another segment, without reading or copying the file, by
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* the AIX exec loader. Padding sections are omitted, nevertheless
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* small amounts of 'padding' still occurs between sections in the file.
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* As modified, this code handles both 3.2 and 4.1 conventions.
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*
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* Synopsis:
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* unexec (new_name, a_name, data_start, bss_start, entry_address)
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* char *new_name, *a_name;
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* unsigned data_start, bss_start, entry_address;
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*
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* Takes a snapshot of the program and makes an a.out format file in the
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* file named by the string argument new_name.
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* If a_name is non-NULL, the symbol table will be taken from the given file.
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* On some machines, an existing a_name file is required.
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*
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* The boundaries within the a.out file may be adjusted with the data_start
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* and bss_start arguments. Either or both may be given as 0 for defaults.
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*
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* Data_start gives the boundary between the text segment and the data
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* segment of the program. The text segment can contain shared, read-only
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* program code and literal data, while the data segment is always unshared
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* and unprotected. Data_start gives the lowest unprotected address.
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* The value you specify may be rounded down to a suitable boundary
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* as required by the machine you are using.
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*
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* Specifying zero for data_start means the boundary between text and data
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* should not be the same as when the program was loaded.
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* If NO_REMAP is defined, the argument data_start is ignored and the
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* segment boundaries are never changed.
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*
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* Bss_start indicates how much of the data segment is to be saved in the
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* a.out file and restored when the program is executed. It gives the lowest
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* unsaved address, and is rounded up to a page boundary. The default when 0
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* is given assumes that the entire data segment is to be stored, including
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* the previous data and bss as well as any additional storage allocated with
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* break (2).
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*
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* The new file is set up to start at entry_address.
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*
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* If you make improvements I'd like to get them too.
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* harpo!utah-cs!thomas, thomas@Utah-20
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*
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*/
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/* There are several compilation parameters affecting unexec:
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* COFF
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Define this if your system uses COFF for executables.
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Otherwise we assume you use Berkeley format.
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* NO_REMAP
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Define this if you do not want to try to save Emacs's pure data areas
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as part of the text segment.
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Saving them as text is good because it allows users to share more.
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However, on machines that locate the text area far from the data area,
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the boundary cannot feasibly be moved. Such machines require
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NO_REMAP.
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Also, remapping can cause trouble with the built-in startup routine
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/lib/crt0.o, which defines `environ' as an initialized variable.
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Dumping `environ' as pure does not work! So, to use remapping,
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you must write a startup routine for your machine in Emacs's crt0.c.
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If NO_REMAP is defined, Emacs uses the system's crt0.o.
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* SECTION_ALIGNMENT
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Some machines that use COFF executables require that each section
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start on a certain boundary *in the COFF file*. Such machines should
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define SECTION_ALIGNMENT to a mask of the low-order bits that must be
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zero on such a boundary. This mask is used to control padding between
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segments in the COFF file.
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If SECTION_ALIGNMENT is not defined, the segments are written
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consecutively with no attempt at alignment. This is right for
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unmodified system V.
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* SEGMENT_MASK
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Some machines require that the beginnings and ends of segments
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*in core* be on certain boundaries. For most machines, a page
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boundary is sufficient. That is the default. When a larger
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boundary is needed, define SEGMENT_MASK to a mask of
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the bits that must be zero on such a boundary.
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* A_TEXT_OFFSET(HDR)
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Some machines count the a.out header as part of the size of the text
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segment (a_text); they may actually load the header into core as the
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first data in the text segment. Some have additional padding between
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the header and the real text of the program that is counted in a_text.
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For these machines, define A_TEXT_OFFSET(HDR) to examine the header
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structure HDR and return the number of bytes to add to `a_text'
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before writing it (above and beyond the number of bytes of actual
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program text). HDR's standard fields are already correct, except that
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this adjustment to the `a_text' field has not yet been made;
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thus, the amount of offset can depend on the data in the file.
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* A_TEXT_SEEK(HDR)
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If defined, this macro specifies the number of bytes to seek into the
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a.out file before starting to write the text segment.a
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* EXEC_MAGIC
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For machines using COFF, this macro, if defined, is a value stored
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into the magic number field of the output file.
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* ADJUST_EXEC_HEADER
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This macro can be used to generate statements to adjust or
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initialize nonstandard fields in the file header
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* ADDR_CORRECT(ADDR)
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Macro to correct an int which is the bit pattern of a pointer to a byte
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into an int which is the number of a byte.
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This macro has a default definition which is usually right.
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This default definition is a no-op on most machines (where a
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pointer looks like an int) but not on all machines.
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*/
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#define XCOFF
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#define COFF
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#define NO_REMAP
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#ifndef emacs
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#define PERROR(arg) perror (arg); return -1
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#else
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#include <config.h>
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#define PERROR(file) report_error (file, new)
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#endif
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#include <a.out.h>
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/* Define getpagesize () if the system does not.
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Note that this may depend on symbols defined in a.out.h
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*/
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#include "getpagesize.h"
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#ifndef makedev /* Try to detect types.h already loaded */
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#include <sys/types.h>
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#endif
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#include <stdio.h>
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#include <sys/stat.h>
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#include <errno.h>
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extern char *start_of_text (); /* Start of text */
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extern char *start_of_data (); /* Start of initialized data */
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extern int _data;
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extern int _edata;
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extern int _text;
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extern int _etext;
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extern int _end;
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#ifdef COFF
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#ifndef USG
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#ifndef STRIDE
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#ifndef UMAX
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#ifndef sun386
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/* I have a suspicion that these are turned off on all systems
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and can be deleted. Try it in version 19. */
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#include <filehdr.h>
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#include <aouthdr.h>
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#include <scnhdr.h>
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#include <syms.h>
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#endif /* not sun386 */
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#endif /* not UMAX */
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#endif /* Not STRIDE */
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#endif /* not USG */
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static struct filehdr f_hdr; /* File header */
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static struct aouthdr f_ohdr; /* Optional file header (a.out) */
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long bias; /* Bias to add for growth */
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long lnnoptr; /* Pointer to line-number info within file */
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static long text_scnptr;
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static long data_scnptr;
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#ifdef XCOFF
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#define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1))
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static long load_scnptr;
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static long orig_load_scnptr;
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static long orig_data_scnptr;
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#endif
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static ulong data_st; /* start of data area written out */
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#ifndef MAX_SECTIONS
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#define MAX_SECTIONS 10
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#endif
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#endif /* COFF */
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static int pagemask;
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/* Correct an int which is the bit pattern of a pointer to a byte
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into an int which is the number of a byte.
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This is a no-op on ordinary machines, but not on all. */
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#ifndef ADDR_CORRECT /* Let m-*.h files override this definition */
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#define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
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#endif
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#ifdef emacs
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#include "lisp.h"
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static
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report_error (file, fd)
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char *file;
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int fd;
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{
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if (fd)
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close (fd);
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report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil));
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}
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#endif /* emacs */
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#define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
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#define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
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#define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1
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static
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report_error_1 (fd, msg, a1, a2)
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int fd;
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char *msg;
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int a1, a2;
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{
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close (fd);
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#ifdef emacs
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error (msg, a1, a2);
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#else
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fprintf (stderr, msg, a1, a2);
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fprintf (stderr, "\n");
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#endif
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}
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static int make_hdr ();
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static void mark_x ();
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static int copy_text_and_data ();
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static int copy_sym ();
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/* ****************************************************************
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* unexec
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*
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* driving logic.
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*/
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unexec (new_name, a_name, data_start, bss_start, entry_address)
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char *new_name, *a_name;
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unsigned data_start, bss_start, entry_address;
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{
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int new, a_out = -1;
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if (a_name && (a_out = open (a_name, 0)) < 0)
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{
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PERROR (a_name);
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}
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if ((new = creat (new_name, 0666)) < 0)
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{
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PERROR (new_name);
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}
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if (make_hdr (new,a_out,data_start,bss_start,entry_address,a_name,new_name) < 0
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|| copy_text_and_data (new) < 0
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|| copy_sym (new, a_out, a_name, new_name) < 0
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#ifdef COFF
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|| adjust_lnnoptrs (new, a_out, new_name) < 0
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#endif
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#ifdef XCOFF
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|| unrelocate_symbols (new, a_out, a_name, new_name) < 0
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#endif
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)
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{
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close (new);
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/* unlink (new_name); /* Failed, unlink new a.out */
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return -1;
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}
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close (new);
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if (a_out >= 0)
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close (a_out);
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mark_x (new_name);
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return 0;
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}
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/* ****************************************************************
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* make_hdr
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*
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* Make the header in the new a.out from the header in core.
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* Modify the text and data sizes.
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*/
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static int
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make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name)
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int new, a_out;
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unsigned data_start, bss_start, entry_address;
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char *a_name;
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char *new_name;
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{
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register int scns;
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unsigned int bss_end;
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struct scnhdr section[MAX_SECTIONS];
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struct scnhdr * f_thdr; /* Text section header */
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struct scnhdr * f_dhdr; /* Data section header */
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struct scnhdr * f_bhdr; /* Bss section header */
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struct scnhdr * f_lhdr; /* Loader section header */
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struct scnhdr * f_tchdr; /* Typechk section header */
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struct scnhdr * f_dbhdr; /* Debug section header */
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struct scnhdr * f_xhdr; /* Except section header */
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load_scnptr = orig_load_scnptr = lnnoptr = 0;
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pagemask = getpagesize () - 1;
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/* Adjust text/data boundary. */
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#ifdef NO_REMAP
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data_start = (long) start_of_data ();
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#endif /* NO_REMAP */
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data_start = ADDR_CORRECT (data_start);
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#ifdef SEGMENT_MASK
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data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */
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#else
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data_start = data_start & ~pagemask; /* (Down) to page boundary. */
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#endif
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bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
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bss_end &= ~ pagemask;
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/* Adjust data/bss boundary. */
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if (bss_start != 0)
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{
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bss_start = (ADDR_CORRECT (bss_start) + pagemask);
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/* (Up) to page bdry. */
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bss_start &= ~ pagemask;
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if (bss_start > bss_end)
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{
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ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
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bss_start);
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}
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}
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else
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bss_start = bss_end;
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if (data_start > bss_start) /* Can't have negative data size. */
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{
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ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
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data_start, bss_start);
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}
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#ifdef COFF
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/* Salvage as much info from the existing file as possible */
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f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL;
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f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL;
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if (a_out >= 0)
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{
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if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
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{
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PERROR (a_name);
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}
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if (f_hdr.f_opthdr > 0)
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{
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if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
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{
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PERROR (a_name);
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}
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}
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if (f_hdr.f_nscns > MAX_SECTIONS)
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{
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ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS");
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}
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/* Loop through section headers */
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for (scns = 0; scns < f_hdr.f_nscns; scns++) {
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struct scnhdr *s = §ion[scns];
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if (read (a_out, s, sizeof (*s)) != sizeof (*s))
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{
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PERROR (a_name);
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}
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#define CHECK_SCNHDR(ptr, name, flags) \
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if (strcmp(s->s_name, name) == 0) { \
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if (s->s_flags != flags) { \
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fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \
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(unsigned long)s->s_flags, flags, name); \
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} \
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if (ptr) { \
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fprintf(stderr, "unexec: duplicate section header for section %s.\n", \
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name); \
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} \
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ptr = s; \
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}
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CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT);
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CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA);
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CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS);
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CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER);
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CHECK_SCNHDR(f_dbhdr, _DEBUG, STYP_DEBUG);
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CHECK_SCNHDR(f_tchdr, _TYPCHK, STYP_TYPCHK);
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CHECK_SCNHDR(f_xhdr, _EXCEPT, STYP_EXCEPT);
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}
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if (f_thdr == 0)
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{
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ERROR1 ("unexec: couldn't find \"%s\" section", _TEXT);
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}
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if (f_dhdr == 0)
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{
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ERROR1 ("unexec: couldn't find \"%s\" section", _DATA);
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}
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if (f_bhdr == 0)
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{
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ERROR1 ("unexec: couldn't find \"%s\" section", _BSS);
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}
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}
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else
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{
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ERROR0 ("can't build a COFF file from scratch yet");
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}
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orig_data_scnptr = f_dhdr->s_scnptr;
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orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0;
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/* Now we alter the contents of all the f_*hdr variables
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to correspond to what we want to dump. */
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/* Indicate that the reloc information is no longer valid for ld (bind);
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we only update it enough to fake out the exec-time loader. */
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f_hdr.f_flags |= (F_RELFLG | F_EXEC);
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#ifdef EXEC_MAGIC
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f_ohdr.magic = EXEC_MAGIC;
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#endif
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#ifndef NO_REMAP
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f_ohdr.tsize = data_start - f_ohdr.text_start;
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f_ohdr.text_start = (long) start_of_text ();
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#endif
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data_st = f_ohdr.data_start ? f_ohdr.data_start : (ulong) &_data;
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f_ohdr.dsize = bss_start - data_st;
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f_ohdr.bsize = bss_end - bss_start;
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f_dhdr->s_size = f_ohdr.dsize;
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f_bhdr->s_size = f_ohdr.bsize;
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f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize;
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f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
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/* fix scnptr's */
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{
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ulong ptr = section[0].s_scnptr;
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bias = -1;
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for (scns = 0; scns < f_hdr.f_nscns; scns++)
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{
|
||
struct scnhdr *s = §ion[scns];
|
||
|
||
if (s->s_flags & STYP_PAD) /* .pad sections omitted in AIX 4.1 */
|
||
{
|
||
/*
|
||
* the text_start should probably be o_algntext but that doesn't
|
||
* seem to change
|
||
*/
|
||
if (f_ohdr.text_start != 0) /* && scns != 0 */
|
||
{
|
||
s->s_size = 512 - (ptr % 512);
|
||
if (s->s_size == 512)
|
||
s->s_size = 0;
|
||
}
|
||
s->s_scnptr = ptr;
|
||
}
|
||
else if (s->s_flags & STYP_DATA)
|
||
s->s_scnptr = ptr;
|
||
else if (!(s->s_flags & (STYP_TEXT | STYP_BSS)))
|
||
{
|
||
if (bias == -1) /* if first section after bss */
|
||
bias = ptr - s->s_scnptr;
|
||
|
||
s->s_scnptr += bias;
|
||
ptr = s->s_scnptr;
|
||
}
|
||
|
||
ptr = ptr + s->s_size;
|
||
}
|
||
}
|
||
|
||
/* fix other pointers */
|
||
for (scns = 0; scns < f_hdr.f_nscns; scns++)
|
||
{
|
||
struct scnhdr *s = §ion[scns];
|
||
|
||
if (s->s_relptr != 0)
|
||
{
|
||
s->s_relptr += bias;
|
||
}
|
||
if (s->s_lnnoptr != 0)
|
||
{
|
||
if (lnnoptr == 0) lnnoptr = s->s_lnnoptr;
|
||
s->s_lnnoptr += bias;
|
||
}
|
||
}
|
||
|
||
if (f_hdr.f_symptr > 0L)
|
||
{
|
||
f_hdr.f_symptr += bias;
|
||
}
|
||
|
||
text_scnptr = f_thdr->s_scnptr;
|
||
data_scnptr = f_dhdr->s_scnptr;
|
||
load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0;
|
||
|
||
#ifdef ADJUST_EXEC_HEADER
|
||
ADJUST_EXEC_HEADER
|
||
#endif /* ADJUST_EXEC_HEADER */
|
||
|
||
if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
|
||
{
|
||
PERROR (new_name);
|
||
}
|
||
|
||
if (f_hdr.f_opthdr > 0)
|
||
{
|
||
if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
|
||
{
|
||
PERROR (new_name);
|
||
}
|
||
}
|
||
|
||
for (scns = 0; scns < f_hdr.f_nscns; scns++) {
|
||
struct scnhdr *s = §ion[scns];
|
||
if (write (new, s, sizeof (*s)) != sizeof (*s))
|
||
{
|
||
PERROR (new_name);
|
||
}
|
||
}
|
||
|
||
return (0);
|
||
|
||
#endif /* COFF */
|
||
}
|
||
|
||
/* ****************************************************************
|
||
|
||
*
|
||
* Copy the text and data segments from memory to the new a.out
|
||
*/
|
||
static int
|
||
copy_text_and_data (new)
|
||
int new;
|
||
{
|
||
register char *end;
|
||
register char *ptr;
|
||
|
||
lseek (new, (long) text_scnptr, 0);
|
||
ptr = start_of_text () + text_scnptr;
|
||
end = ptr + f_ohdr.tsize;
|
||
write_segment (new, ptr, end);
|
||
|
||
lseek (new, (long) data_scnptr, 0);
|
||
ptr = (char *) data_st;
|
||
end = ptr + f_ohdr.dsize;
|
||
write_segment (new, ptr, end);
|
||
|
||
return 0;
|
||
}
|
||
|
||
#define UnexBlockSz (1<<12) /* read/write block size */
|
||
write_segment (new, ptr, end)
|
||
int new;
|
||
register char *ptr, *end;
|
||
{
|
||
register int i, nwrite, ret;
|
||
char buf[80];
|
||
extern int errno;
|
||
char zeros[UnexBlockSz];
|
||
|
||
for (i = 0; ptr < end;)
|
||
{
|
||
/* distance to next block. */
|
||
nwrite = (((int) ptr + UnexBlockSz) & -UnexBlockSz) - (int) ptr;
|
||
/* But not beyond specified end. */
|
||
if (nwrite > end - ptr) nwrite = end - ptr;
|
||
ret = write (new, ptr, nwrite);
|
||
/* If write gets a page fault, it means we reached
|
||
a gap between the old text segment and the old data segment.
|
||
This gap has probably been remapped into part of the text segment.
|
||
So write zeros for it. */
|
||
if (ret == -1 && errno == EFAULT)
|
||
{
|
||
bzero (zeros, nwrite);
|
||
write (new, zeros, nwrite);
|
||
}
|
||
else if (nwrite != ret)
|
||
{
|
||
sprintf (buf,
|
||
"unexec write failure: addr 0x%lx, fileno %d, size 0x%x, wrote 0x%x, errno %d",
|
||
(unsigned long)ptr, new, nwrite, ret, errno);
|
||
PERROR (buf);
|
||
}
|
||
i += nwrite;
|
||
ptr += nwrite;
|
||
}
|
||
}
|
||
|
||
/* ****************************************************************
|
||
* copy_sym
|
||
*
|
||
* Copy the relocation information and symbol table from the a.out to the new
|
||
*/
|
||
static int
|
||
copy_sym (new, a_out, a_name, new_name)
|
||
int new, a_out;
|
||
char *a_name, *new_name;
|
||
{
|
||
char page[UnexBlockSz];
|
||
int n;
|
||
|
||
if (a_out < 0)
|
||
return 0;
|
||
|
||
if (orig_load_scnptr == 0L)
|
||
return 0;
|
||
|
||
if (lnnoptr && lnnoptr < orig_load_scnptr) /* if there is line number info */
|
||
lseek (a_out, lnnoptr, 0); /* start copying from there */
|
||
else
|
||
lseek (a_out, orig_load_scnptr, 0); /* Position a.out to symtab. */
|
||
|
||
while ((n = read (a_out, page, sizeof page)) > 0)
|
||
{
|
||
if (write (new, page, n) != n)
|
||
{
|
||
PERROR (new_name);
|
||
}
|
||
}
|
||
if (n < 0)
|
||
{
|
||
PERROR (a_name);
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
/* ****************************************************************
|
||
* mark_x
|
||
*
|
||
* After successfully building the new a.out, mark it executable
|
||
*/
|
||
static void
|
||
mark_x (name)
|
||
char *name;
|
||
{
|
||
struct stat sbuf;
|
||
int um;
|
||
int new = 0; /* for PERROR */
|
||
|
||
um = umask (777);
|
||
umask (um);
|
||
if (stat (name, &sbuf) == -1)
|
||
{
|
||
PERROR (name);
|
||
}
|
||
sbuf.st_mode |= 0111 & ~um;
|
||
if (chmod (name, sbuf.st_mode) == -1)
|
||
PERROR (name);
|
||
}
|
||
|
||
/*
|
||
* If the COFF file contains a symbol table and a line number section,
|
||
* then any auxiliary entries that have values for x_lnnoptr must
|
||
* be adjusted by the amount that the line number section has moved
|
||
* in the file (bias computed in make_hdr). The #@$%&* designers of
|
||
* the auxiliary entry structures used the absolute file offsets for
|
||
* the line number entry rather than an offset from the start of the
|
||
* line number section!
|
||
*
|
||
* When I figure out how to scan through the symbol table and pick out
|
||
* the auxiliary entries that need adjustment, this routine will
|
||
* be fixed. As it is now, all such entries are wrong and sdb
|
||
* will complain. Fred Fish, UniSoft Systems Inc.
|
||
*
|
||
* I believe this is now fixed correctly. Bill Mann
|
||
*/
|
||
|
||
#ifdef COFF
|
||
|
||
/* This function is probably very slow. Instead of reopening the new
|
||
file for input and output it should copy from the old to the new
|
||
using the two descriptors already open (WRITEDESC and READDESC).
|
||
Instead of reading one small structure at a time it should use
|
||
a reasonable size buffer. But I don't have time to work on such
|
||
things, so I am installing it as submitted to me. -- RMS. */
|
||
|
||
adjust_lnnoptrs (writedesc, readdesc, new_name)
|
||
int writedesc;
|
||
int readdesc;
|
||
char *new_name;
|
||
{
|
||
register int nsyms;
|
||
register int naux;
|
||
register int new;
|
||
#ifdef amdahl_uts
|
||
SYMENT symentry;
|
||
AUXENT auxentry;
|
||
#else
|
||
struct syment symentry;
|
||
union auxent auxentry;
|
||
#endif
|
||
|
||
if (!lnnoptr || !f_hdr.f_symptr)
|
||
return 0;
|
||
|
||
if ((new = open (new_name, 2)) < 0)
|
||
{
|
||
PERROR (new_name);
|
||
return -1;
|
||
}
|
||
|
||
lseek (new, f_hdr.f_symptr, 0);
|
||
for (nsyms = 0; nsyms < f_hdr.f_nsyms; nsyms++)
|
||
{
|
||
read (new, &symentry, SYMESZ);
|
||
if (symentry.n_sclass == C_BINCL || symentry.n_sclass == C_EINCL)
|
||
{
|
||
symentry.n_value += bias;
|
||
lseek (new, -SYMESZ, 1);
|
||
write (new, &symentry, SYMESZ);
|
||
}
|
||
|
||
for (naux = symentry.n_numaux; naux-- != 0; )
|
||
{
|
||
read (new, &auxentry, AUXESZ);
|
||
nsyms++;
|
||
if (naux != 0 /* skip csect auxentry (last entry) */
|
||
&& (symentry.n_sclass == C_EXT || symentry.n_sclass == C_HIDEXT))
|
||
{
|
||
auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
|
||
lseek (new, -AUXESZ, 1);
|
||
write (new, &auxentry, AUXESZ);
|
||
}
|
||
}
|
||
}
|
||
close (new);
|
||
}
|
||
|
||
#endif /* COFF */
|
||
|
||
#ifdef XCOFF
|
||
|
||
/* It is probably a false economy to optimise this routine (it used to
|
||
read one LDREL and do do two lseeks per iteration) but the wrath of
|
||
RMS (see above :-) would be too much to bear */
|
||
|
||
unrelocate_symbols (new, a_out, a_name, new_name)
|
||
int new, a_out;
|
||
char *a_name, *new_name;
|
||
{
|
||
register int i;
|
||
register int l;
|
||
register LDREL *ldrel;
|
||
LDHDR ldhdr;
|
||
LDREL ldrel_buf [20];
|
||
ulong t_reloc = (ulong) &_text - f_ohdr.text_start;
|
||
ulong d_reloc = (ulong) &_data - ALIGN(f_ohdr.data_start, 2);
|
||
int * p;
|
||
|
||
if (load_scnptr == 0)
|
||
return 0;
|
||
|
||
lseek (a_out, orig_load_scnptr, 0);
|
||
if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr))
|
||
{
|
||
PERROR (new_name);
|
||
}
|
||
|
||
#define SYMNDX_TEXT 0
|
||
#define SYMNDX_DATA 1
|
||
#define SYMNDX_BSS 2
|
||
l = 0;
|
||
for (i = 0; i < ldhdr.l_nreloc; i++, l--, ldrel++)
|
||
{
|
||
if (l == 0) {
|
||
lseek (a_out,
|
||
orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
|
||
0);
|
||
|
||
l = ldhdr.l_nreloc - i;
|
||
if (l > sizeof (ldrel_buf) / LDRELSZ)
|
||
l = sizeof (ldrel_buf) / LDRELSZ;
|
||
|
||
if (read (a_out, ldrel_buf, l * LDRELSZ) != l * LDRELSZ)
|
||
{
|
||
PERROR (a_name);
|
||
}
|
||
ldrel = ldrel_buf;
|
||
}
|
||
|
||
/* move the BSS loader symbols to the DATA segment */
|
||
if (ldrel->l_symndx == SYMNDX_BSS)
|
||
{
|
||
ldrel->l_symndx = SYMNDX_DATA;
|
||
|
||
lseek (new,
|
||
load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
|
||
0);
|
||
|
||
if (write (new, ldrel, LDRELSZ) != LDRELSZ)
|
||
{
|
||
PERROR (new_name);
|
||
}
|
||
}
|
||
|
||
if (ldrel->l_rsecnm == f_ohdr.o_sndata)
|
||
{
|
||
int orig_int;
|
||
|
||
lseek (a_out,
|
||
orig_data_scnptr + (ldrel->l_vaddr - f_ohdr.data_start), 0);
|
||
|
||
if (read (a_out, (void *) &orig_int, sizeof (orig_int)) != sizeof (orig_int))
|
||
{
|
||
PERROR (a_name);
|
||
}
|
||
|
||
p = (int *) (ldrel->l_vaddr + d_reloc);
|
||
|
||
switch (ldrel->l_symndx) {
|
||
case SYMNDX_TEXT:
|
||
orig_int = * p - t_reloc;
|
||
break;
|
||
|
||
case SYMNDX_DATA:
|
||
case SYMNDX_BSS:
|
||
orig_int = * p - d_reloc;
|
||
break;
|
||
}
|
||
|
||
if (orig_int != * p)
|
||
{
|
||
lseek (new,
|
||
data_scnptr + (ldrel->l_vaddr - f_ohdr.data_start), 0);
|
||
if (write (new, (void *) &orig_int, sizeof (orig_int))
|
||
!= sizeof (orig_int))
|
||
{
|
||
PERROR (new_name);
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
#endif /* XCOFF */
|