entered into RCS
This commit is contained in:
Jim Blandy
parent
b2c9579f17
commit
d427b66a66
43 changed files with 3193 additions and 104 deletions
601
src/unexconvex.c
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601
src/unexconvex.c
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/* Modified version of unexec for convex machines.
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Note that the GNU project considers support for the peculiarities
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of the Convex operating system a peripheral activity which should
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not be allowed to divert effort from development of the GNU system.
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Changes in this code will be installed when Convex system
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maintainers send them in, but aside from that we don't plan to
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think about it, or about whether other Emacs maintenance might
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break it.
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Copyright (C) 1985, 1986, 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* modified for C-1 arch by jthomp@convex 871103 */
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/* Corrected to support convex SOFF object file formats and thread specific
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* regions. streepy@convex 890302
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*/
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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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* 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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#include "config.h"
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#define PERROR(file) report_error (file, new)
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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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#include <sys/types.h>
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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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#include <machine/filehdr.h>
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#include <machine/opthdr.h>
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#include <machine/scnhdr.h>
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#include <machine/pte.h>
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static long block_copy_start; /* Old executable start point */
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static struct filehdr f_hdr; /* File header */
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static struct opthdr f_ohdr; /* Optional file header (a.out) */
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long bias; /* Bias to add for growth */
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#define SYMS_START block_copy_start
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static long text_scnptr;
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static long data_scnptr;
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static int pagemask;
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static int pagesz;
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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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error ("Failure operating on %s", file);
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}
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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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error (msg, a1, a2);
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}
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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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PERROR (a_name);
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}
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if ((new = creat (new_name, 0666)) < 0) {
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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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close (new);
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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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struct scnhdr *stbl; /* Table of all scnhdr's */
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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_tdhdr; /* Thread Data section header */
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struct scnhdr *f_bhdr; /* Bss section header */
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struct scnhdr *f_tbhdr; /* Thread Bss section header */
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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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unsigned int eo_data; /* End of initialized data in new exec file */
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int scntype; /* Section type */
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int i; /* Var for sorting by vaddr */
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struct scnhdr scntemp; /* For swapping entries in sort */
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extern char *start_of_data();
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pagemask = (pagesz = getpagesize()) - 1;
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/* Adjust text/data boundary. */
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if (!data_start)
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data_start = (unsigned) start_of_data ();
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data_start = data_start & ~pagemask; /* (Down) to page boundary. */
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bss_end = (sbrk(0) + pagemask) & ~pagemask;
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/* Adjust data/bss boundary. */
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if (bss_start != 0) {
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bss_start = (bss_start + pagemask) & ~pagemask;/* (Up) to page bdry. */
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if (bss_start > bss_end) {
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ERROR1 ("unexec: Specified bss_start (%x) is past end of program",
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bss_start);
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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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ERROR2 ("unexec: data_start (%x) can't be greater than bss_start (%x)",
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data_start, bss_start);
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}
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/* Salvage as much info from the existing file as possible */
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if (a_out < 0) {
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ERROR0 ("can't build a COFF file from scratch yet");
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/*NOTREACHED*/
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}
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if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) {
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PERROR (a_name);
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}
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block_copy_start += sizeof (f_hdr);
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if (f_hdr.h_opthdr > 0) {
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if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) {
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PERROR (a_name);
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}
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block_copy_start += sizeof (f_ohdr);
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}
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/* Allocate room for scn headers */
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stbl = (struct scnhdr *)malloc( sizeof(struct scnhdr) * f_hdr.h_nscns );
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if( stbl == NULL ) {
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ERROR0( "unexec: malloc of stbl failed" );
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}
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f_tdhdr = f_tbhdr = NULL;
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/* Loop through section headers, copying them in */
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for (scns = 0; scns < f_hdr.h_nscns; scns++) {
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if( read( a_out, &stbl[scns], sizeof(*stbl)) != sizeof(*stbl)) {
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PERROR (a_name);
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}
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scntype = stbl[scns].s_flags & S_TYPMASK; /* What type of section */
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if( stbl[scns].s_scnptr > 0L) {
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if( block_copy_start < stbl[scns].s_scnptr + stbl[scns].s_size )
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block_copy_start = stbl[scns].s_scnptr + stbl[scns].s_size;
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}
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if( scntype == S_TEXT) {
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f_thdr = &stbl[scns];
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} else if( scntype == S_DATA) {
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f_dhdr = &stbl[scns];
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#ifdef S_TDATA
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} else if( scntype == S_TDATA ) {
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f_tdhdr = &stbl[scns];
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} else if( scntype == S_TBSS ) {
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f_tbhdr = &stbl[scns];
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#endif /* S_TDATA (thread stuff) */
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} else if( scntype == S_BSS) {
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f_bhdr = &stbl[scns];
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}
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}
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/* We will now convert TEXT and DATA into TEXT, BSS into DATA, and leave
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* all thread stuff alone.
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*/
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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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f_thdr->s_vaddr = (long) start_of_text ();
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f_thdr->s_size = data_start - f_thdr->s_vaddr;
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f_thdr->s_scnptr = pagesz;
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f_thdr->s_relptr = 0;
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f_thdr->s_nrel = 0;
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eo_data = f_thdr->s_scnptr + f_thdr->s_size;
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if( f_tdhdr ) { /* Process thread data */
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f_tdhdr->s_vaddr = data_start;
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f_tdhdr->s_size += f_dhdr->s_size - (data_start - f_dhdr->s_vaddr);
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f_tdhdr->s_scnptr = eo_data;
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f_tdhdr->s_relptr = 0;
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f_tdhdr->s_nrel = 0;
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eo_data += f_tdhdr->s_size;
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/* And now for DATA */
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f_dhdr->s_vaddr = f_bhdr->s_vaddr; /* Take BSS start address */
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f_dhdr->s_size = bss_end - f_bhdr->s_vaddr;
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f_dhdr->s_scnptr = eo_data;
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f_dhdr->s_relptr = 0;
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f_dhdr->s_nrel = 0;
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eo_data += f_dhdr->s_size;
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} else {
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f_dhdr->s_vaddr = data_start;
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f_dhdr->s_size = bss_start - data_start;
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f_dhdr->s_scnptr = eo_data;
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f_dhdr->s_relptr = 0;
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f_dhdr->s_nrel = 0;
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eo_data += f_dhdr->s_size;
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}
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f_bhdr->s_vaddr = bss_start;
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f_bhdr->s_size = bss_end - bss_start + pagesz /* fudge */;
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f_bhdr->s_scnptr = 0;
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f_bhdr->s_relptr = 0;
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f_bhdr->s_nrel = 0;
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text_scnptr = f_thdr->s_scnptr;
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data_scnptr = f_dhdr->s_scnptr;
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bias = eo_data - block_copy_start;
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if (f_ohdr.o_symptr > 0L) {
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f_ohdr.o_symptr += bias;
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}
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if (f_hdr.h_strptr > 0) {
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f_hdr.h_strptr += bias;
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}
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if (write (new, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr)) {
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PERROR (new_name);
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}
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if (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr)) {
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PERROR (new_name);
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}
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for( scns = 0; scns < f_hdr.h_nscns; scns++ ) {
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/* This is a cheesey little loop to write out the section headers
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* in order of increasing virtual address. Dull but effective.
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||||
*/
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||||
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for( i = scns+1; i < f_hdr.h_nscns; i++ ) {
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if( stbl[i].s_vaddr < stbl[scns].s_vaddr ) { /* Swap */
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scntemp = stbl[i];
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stbl[i] = stbl[scns];
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stbl[scns] = scntemp;
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}
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||||
}
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||||
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||||
}
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||||
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for( scns = 0; scns < f_hdr.h_nscns; scns++ ) {
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if( write( new, &stbl[scns], sizeof(*stbl)) != sizeof(*stbl)) {
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PERROR (new_name);
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||||
}
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|
||||
}
|
||||
|
||||
return (0);
|
||||
|
||||
}
|
||||
|
||||
/* ****************************************************************
|
||||
* copy_text_and_data
|
||||
*
|
||||
* Copy the text and data segments from memory to the new a.out
|
||||
*/
|
||||
static int
|
||||
copy_text_and_data (new)
|
||||
int new;
|
||||
{
|
||||
register int scns;
|
||||
|
||||
for( scns = 0; scns < f_hdr.h_nscns; scns++ )
|
||||
write_segment( new, &stbl[scns] );
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
write_segment( new, sptr )
|
||||
int new;
|
||||
struct scnhdr *sptr;
|
||||
{
|
||||
register char *ptr, *end;
|
||||
register int nwrite, ret;
|
||||
char buf[80];
|
||||
extern int errno;
|
||||
char zeros[128];
|
||||
|
||||
if( sptr->s_scnptr == 0 )
|
||||
return; /* Nothing to do */
|
||||
|
||||
if( lseek( new, (long) sptr->s_scnptr, 0 ) == -1 )
|
||||
PERROR( "unexecing" );
|
||||
|
||||
bzero (zeros, sizeof zeros);
|
||||
|
||||
ptr = (char *) sptr->s_vaddr;
|
||||
end = ptr + sptr->s_size;
|
||||
|
||||
while( ptr < end ) {
|
||||
|
||||
/* distance to next multiple of 128. */
|
||||
nwrite = (((int) ptr + 128) & -128) - (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)
|
||||
write (new, zeros, nwrite);
|
||||
else if (nwrite != ret) {
|
||||
sprintf (buf,
|
||||
"unexec write failure: addr 0x%x, fileno %d, size 0x%x, wrote 0x%x, errno %d",
|
||||
ptr, new, nwrite, ret, errno);
|
||||
PERROR (buf);
|
||||
}
|
||||
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[1024];
|
||||
int n;
|
||||
|
||||
if (a_out < 0)
|
||||
return 0;
|
||||
|
||||
if (SYMS_START == 0L)
|
||||
return 0;
|
||||
|
||||
lseek (a_out, SYMS_START, 0); /* Position a.out to symtab. */
|
||||
lseek( new, (long)f_ohdr.o_symptr, 0 );
|
||||
|
||||
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 succesfully building the new a.out, mark it executable
|
||||
*/
|
||||
static
|
||||
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);
|
||||
}
|
||||
|
||||
/* Find the first pty letter. This is usually 'p', as in ptyp0, but
|
||||
is sometimes configured down to 'm', 'n', or 'o' for some reason. */
|
||||
|
||||
first_pty_letter ()
|
||||
{
|
||||
struct stat buf;
|
||||
char pty_name[16];
|
||||
char c;
|
||||
|
||||
for (c = 'o'; c >= 'a'; c--)
|
||||
{
|
||||
sprintf (pty_name, "/dev/pty%c0", c);
|
||||
if (stat (pty_name, &buf) < 0)
|
||||
return c + 1;
|
||||
}
|
||||
return 'a';
|
||||
}
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue