xemacs-beta: src/unexaix.c comparison

comparison src/unexaix.c @ 0:376386a54a3c r19-14

Import from CVS: tag r19-14

author	cvs
date	Mon, 13 Aug 2007 08:45:50 +0200
parents
children	e45d5e7c476e

comparison

equal deleted inserted replaced

--1:000000000000
+:376386a54a3c
+/* Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc.
+This file is part of XEmacs.
+XEmacs 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.
+XEmacs 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 XEmacs; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+/* Synched up with: FSF 19.31. */
+/* Modified by Andrew.Vignaux@comp.vuw.ac.nz to get it to work :-) */
+/*
+* unexec.c - Convert a running program into an a.out file.
+*
+* Author:	Spencer W. Thomas
+* 		Computer Science Dept.
+* 		University of Utah
+* Date:	Tue Mar  2 1982
+* Modified heavily since then.
+*
+* Updated for AIX 4.1.3 by Bill_Mann @ PraxisInt.com, Feb 1996
+*   As of AIX 4.1, text, data, and bss are pre-relocated by the binder in
+*   such a way that the file can be mapped with code in one segment and
+*   data/bss in another segment, without reading or copying the file, by
+*   the AIX exec loader.  Padding sections are omitted, nevertheless
+*   small amounts of 'padding' still occurs between sections in the file.
+*   As modified, this code handles both 3.2 and 4.1 conventions.
+*
+* Synopsis:
+*	unexec (new_name, a_name, data_start, bss_start, entry_address)
+*	char *new_name, *a_name;
+*	unsigned data_start, bss_start, entry_address;
+*
+* Takes a snapshot of the program and makes an a.out format file in the
+* file named by the string argument new_name.
+* If a_name is non-NULL, the symbol table will be taken from the given file.
+* On some machines, an existing a_name file is required.
+*
+* The boundaries within the a.out file may be adjusted with the data_start
+* and bss_start arguments.  Either or both may be given as 0 for defaults.
+*
+* Data_start gives the boundary between the text segment and the data
+* segment of the program.  The text segment can contain shared, read-only
+* program code and literal data, while the data segment is always unshared
+* and unprotected.  Data_start gives the lowest unprotected address.
+* The value you specify may be rounded down to a suitable boundary
+* as required by the machine you are using.
+*
+* Specifying zero for data_start means the boundary between text and data
+* should not be the same as when the program was loaded.
+* If NO_REMAP is defined, the argument data_start is ignored and the
+* segment boundaries are never changed.
+*
+* Bss_start indicates how much of the data segment is to be saved in the
+* a.out file and restored when the program is executed.  It gives the lowest
+* unsaved address, and is rounded up to a page boundary.  The default when 0
+* is given assumes that the entire data segment is to be stored, including
+* the previous data and bss as well as any additional storage allocated with
+* break (2).
+*
+* The new file is set up to start at entry_address.
+*
+* If you make improvements I'd like to get them too.
+* harpo!utah-cs!thomas, thomas@Utah-20
+*
+*/
+/* There are several compilation parameters affecting unexec:
+* COFF
+Define this if your system uses COFF for executables.
+Otherwise we assume you use Berkeley format.
+* NO_REMAP
+Define this if you do not want to try to save Emacs's pure data areas
+as part of the text segment.
+Saving them as text is good because it allows users to share more.
+However, on machines that locate the text area far from the data area,
+the boundary cannot feasibly be moved.  Such machines require
+NO_REMAP.
+Also, remapping can cause trouble with the built-in startup routine
+/lib/crt0.o, which defines `environ' as an initialized variable.
+Dumping `environ' as pure does not work!  So, to use remapping,
+you must write a startup routine for your machine in Emacs's crt0.c.
+If NO_REMAP is defined, Emacs uses the system's crt0.o.
+* SECTION_ALIGNMENT
+Some machines that use COFF executables require that each section
+start on a certain boundary *in the COFF file*.  Such machines should
+define SECTION_ALIGNMENT to a mask of the low-order bits that must be
+zero on such a boundary.  This mask is used to control padding between
+segments in the COFF file.
+If SECTION_ALIGNMENT is not defined, the segments are written
+consecutively with no attempt at alignment.  This is right for
+unmodified system V.
+* SEGMENT_MASK
+Some machines require that the beginnings and ends of segments
+*in core* be on certain boundaries.  For most machines, a page
+boundary is sufficient.  That is the default.  When a larger
+boundary is needed, define SEGMENT_MASK to a mask of
+the bits that must be zero on such a boundary.
+* A_TEXT_OFFSET(HDR)
+Some machines count the a.out header as part of the size of the text
+segment (a_text); they may actually load the header into core as the
+first data in the text segment.  Some have additional padding between
+the header and the real text of the program that is counted in a_text.
+For these machines, define A_TEXT_OFFSET(HDR) to examine the header
+structure HDR and return the number of bytes to add to `a_text'
+before writing it (above and beyond the number of bytes of actual
+program text).  HDR's standard fields are already correct, except that
+this adjustment to the `a_text' field has not yet been made;
+thus, the amount of offset can depend on the data in the file.
+* A_TEXT_SEEK(HDR)
+If defined, this macro specifies the number of bytes to seek into the
+a.out file before starting to write the text segment.a
+* EXEC_MAGIC
+For machines using COFF, this macro, if defined, is a value stored
+into the magic number field of the output file.
+* ADJUST_EXEC_HEADER
+This macro can be used to generate statements to adjust or
+initialize nonstandard fields in the file header
+* ADDR_CORRECT(ADDR)
+Macro to correct an int which is the bit pattern of a pointer to a byte
+into an int which is the number of a byte.
+This macro has a default definition which is usually right.
+This default definition is a no-op on most machines (where a
+pointer looks like an int) but not on all machines.
+*/
+#define XCOFF
+#define COFF
+#define NO_REMAP
+#ifndef emacs
+#define PERROR(arg) perror (arg); return -1
+#else
+#include <config.h>
+#define PERROR(file) report_error (file, new)
+#endif
+#include <a.out.h>
+/* Define getpagesize () if the system does not.
+Note that this may depend on symbols defined in a.out.h
+*/
+#include "getpagesize.h"
+#ifndef makedev			/* Try to detect types.h already loaded */
+#include <sys/types.h>
+#endif
+#include <stdio.h>
+#include <sys/stat.h>
+#include <errno.h>
+extern char *start_of_text ();		/* Start of text */
+extern char *start_of_data ();		/* Start of initialized data */
+extern int _data;
+extern int _edata;
+extern int _text;
+extern int _etext;
+extern int _end;
+#ifdef COFF
+#ifndef USG
+#ifndef STRIDE
+#ifndef UMAX
+#ifndef sun386
+/* I have a suspicion that these are turned off on all systems
+and can be deleted.  Try it in version 19.  */
+#include <filehdr.h>
+#include <aouthdr.h>
+#include <scnhdr.h>
+#include <syms.h>
+#endif /* not sun386 */
+#endif /* not UMAX */
+#endif /* Not STRIDE */
+#endif /* not USG */
+static struct filehdr f_hdr;		/* File header */
+static struct aouthdr f_ohdr;		/* Optional file header (a.out) */
+long bias;			/* Bias to add for growth */
+long lnnoptr;			/* Pointer to line-number info within file */
+static long text_scnptr;
+static long data_scnptr;
+#ifdef XCOFF
+#define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1))
+static long load_scnptr;
+static long orig_load_scnptr;
+static long orig_data_scnptr;
+#endif
+static ulong data_st;                   /* start of data area written out */
+#ifndef MAX_SECTIONS
+#define MAX_SECTIONS	10
+#endif
+#endif /* COFF */
+static int pagemask;
+/* Correct an int which is the bit pattern of a pointer to a byte
+into an int which is the number of a byte.
+This is a no-op on ordinary machines, but not on all.  */
+#ifndef ADDR_CORRECT   /* Let m-*.h files override this definition */
+#define ADDR_CORRECT(x) ((char *)(x) - (char*)0)
+#endif
+#ifdef emacs
+#include "lisp.h"
+static
+report_error (file, fd)
+char *file;
+int fd;
+{
+if (fd)
+close (fd);
+report_file_error ("Cannot unexec", Fcons (build_string (file), Qnil));
+}
+#endif /* emacs */
+#define ERROR0(msg) report_error_1 (new, msg, 0, 0); return -1
+#define ERROR1(msg,x) report_error_1 (new, msg, x, 0); return -1
+#define ERROR2(msg,x,y) report_error_1 (new, msg, x, y); return -1
+static
+report_error_1 (fd, msg, a1, a2)
+int fd;
+char *msg;
+int a1, a2;
+{
+close (fd);
+#ifdef emacs
+error (msg, a1, a2);
+#else
+fprintf (stderr, msg, a1, a2);
+fprintf (stderr, "\n");
+#endif
+}
+static int make_hdr ();
+static void mark_x ();
+static int copy_text_and_data ();
+static int copy_sym ();
+/* ****************************************************************
+* unexec
+*
+* driving logic.
+*/
+unexec (new_name, a_name, data_start, bss_start, entry_address)
+char *new_name, *a_name;
+unsigned data_start, bss_start, entry_address;
+{
+int new, a_out = -1;
+if (a_name && (a_out = open (a_name, 0)) < 0)
+{
+PERROR (a_name);
+}
+if ((new = creat (new_name, 0666)) < 0)
+{
+PERROR (new_name);
+}
+if (make_hdr (new,a_out,data_start,bss_start,entry_address,a_name,new_name) < 0
+|| copy_text_and_data (new) < 0
+|| copy_sym (new, a_out, a_name, new_name) < 0
+#ifdef COFF
+|| adjust_lnnoptrs (new, a_out, new_name) < 0
+#endif
+#ifdef XCOFF
+|| unrelocate_symbols (new, a_out, a_name, new_name) < 0
+#endif
+)
+{
+close (new);
+/* unlink (new_name);	    	/* Failed, unlink new a.out */
+return -1;
+}
+close (new);
+if (a_out >= 0)
+close (a_out);
+mark_x (new_name);
+return 0;
+}
+/* ****************************************************************
+* make_hdr
+*
+* Make the header in the new a.out from the header in core.
+* Modify the text and data sizes.
+*/
+static int
+make_hdr (new, a_out, data_start, bss_start, entry_address, a_name, new_name)
+int new, a_out;
+unsigned data_start, bss_start, entry_address;
+char *a_name;
+char *new_name;
+{
+int scns;
+unsigned int bss_end;
+struct scnhdr section[MAX_SECTIONS];
+struct scnhdr * f_thdr;		/* Text section header */
+struct scnhdr * f_dhdr;		/* Data section header */
+struct scnhdr * f_bhdr;		/* Bss section header */
+struct scnhdr * f_lhdr;		/* Loader section header */
+struct scnhdr * f_tchdr;		/* Typechk section header */
+struct scnhdr * f_dbhdr;		/* Debug section header */
+struct scnhdr * f_xhdr;		/* Except section header */
+load_scnptr = orig_load_scnptr = lnnoptr = 0;
+pagemask = getpagesize () - 1;
+/* Adjust text/data boundary. */
+#ifdef NO_REMAP
+data_start = (long) start_of_data ();
+#endif /*  NO_REMAP */
+data_start = ADDR_CORRECT (data_start);
+#ifdef SEGMENT_MASK
+data_start = data_start & ~SEGMENT_MASK; /* (Down) to segment boundary. */
+#else
+data_start = data_start & ~pagemask; /* (Down) to page boundary. */
+#endif
+bss_end = ADDR_CORRECT (sbrk (0)) + pagemask;
+bss_end &= ~ pagemask;
+/* Adjust data/bss boundary. */
+if (bss_start != 0)
+{
+bss_start = (ADDR_CORRECT (bss_start) + pagemask);
+/* (Up) to page bdry. */
+bss_start &= ~ pagemask;
+if (bss_start > bss_end)
+	{
+	  ERROR1 ("unexec: Specified bss_start (%u) is past end of program",
+		  bss_start);
+	}
+}
+else
+bss_start = bss_end;
+if (data_start > bss_start)	/* Can't have negative data size. */
+{
+ERROR2 ("unexec: data_start (%u) can't be greater than bss_start (%u)",
+	      data_start, bss_start);
+}
+#ifdef COFF
+/* Salvage as much info from the existing file as possible */
+f_thdr = NULL; f_dhdr = NULL; f_bhdr = NULL;
+f_lhdr = NULL; f_tchdr = NULL; f_dbhdr = NULL; f_xhdr = NULL;
+if (a_out >= 0)
+{
+if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
+	{
+	  PERROR (a_name);
+	}
+if (f_hdr.f_opthdr > 0)
+	{
+	  if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
+	    {
+	      PERROR (a_name);
+	    }
+	}
+if (f_hdr.f_nscns > MAX_SECTIONS)
+	{
+	  ERROR0 ("unexec: too many section headers -- increase MAX_SECTIONS");
+	}
+/* Loop through section headers */
+for (scns = 0; scns < f_hdr.f_nscns; scns++) {
+	struct scnhdr *s = &section[scns];
+	if (read (a_out, s, sizeof (*s)) != sizeof (*s))
+	  {
+	    PERROR (a_name);
+	  }
+#define CHECK_SCNHDR(ptr, name, flags) \
+if (strcmp(s->s_name, name) == 0) { \
+if (s->s_flags != flags) { \
+fprintf(stderr, "unexec: %lx flags where %x expected in %s section.\n", \
+	      (unsigned long)s->s_flags, flags, name); \
+} \
+if (ptr) { \
+fprintf(stderr, "unexec: duplicate section header for section %s.\n", \
+	      name); \
+} \
+ptr = s; \
+}
+	CHECK_SCNHDR(f_thdr, _TEXT, STYP_TEXT);
+	CHECK_SCNHDR(f_dhdr, _DATA, STYP_DATA);
+	CHECK_SCNHDR(f_bhdr, _BSS, STYP_BSS);
+	CHECK_SCNHDR(f_lhdr, _LOADER, STYP_LOADER);
+	CHECK_SCNHDR(f_dbhdr, _DEBUG,  STYP_DEBUG);
+	CHECK_SCNHDR(f_tchdr, _TYPCHK,  STYP_TYPCHK);
+	CHECK_SCNHDR(f_xhdr, _EXCEPT,  STYP_EXCEPT);
+}
+if (f_thdr == 0)
+	{
+	  ERROR1 ("unexec: couldn't find \"%s\" section", _TEXT);
+	}
+if (f_dhdr == 0)
+	{
+	  ERROR1 ("unexec: couldn't find \"%s\" section", _DATA);
+	}
+if (f_bhdr == 0)
+	{
+	  ERROR1 ("unexec: couldn't find \"%s\" section", _BSS);
+	}
+}
+else
+{
+ERROR0 ("can't build a COFF file from scratch yet");
+}
+orig_data_scnptr = f_dhdr->s_scnptr;
+orig_load_scnptr = f_lhdr ? f_lhdr->s_scnptr : 0;
+/* Now we alter the contents of all the f_*hdr variables
+to correspond to what we want to dump.  */
+/* Indicate that the reloc information is no longer valid for ld (bind);
+we only update it enough to fake out the exec-time loader.  */
+f_hdr.f_flags |= (F_RELFLG | F_EXEC);
+#ifdef EXEC_MAGIC
+f_ohdr.magic = EXEC_MAGIC;
+#endif
+#ifndef NO_REMAP
+f_ohdr.tsize = data_start - f_ohdr.text_start;
+f_ohdr.text_start = (long) start_of_text ();
+#endif
+data_st = f_ohdr.data_start ? f_ohdr.data_start : (ulong) &_data;
+f_ohdr.dsize = bss_start - data_st;
+f_ohdr.bsize = bss_end - bss_start;
+f_dhdr->s_size = f_ohdr.dsize;
+f_bhdr->s_size = f_ohdr.bsize;
+f_bhdr->s_paddr = f_ohdr.data_start + f_ohdr.dsize;
+f_bhdr->s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
+/* fix scnptr's */
+{
+ulong ptr = section[0].s_scnptr;
+bias = -1;
+for (scns = 0; scns < f_hdr.f_nscns; scns++)
+{
+	struct scnhdr *s = &section[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 = &section[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 = &section[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;
+{
+char *end;
+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;
+char *ptr, *end;
+{
+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;
+{
+int nsyms;
+int naux;
+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;
+{
+int i;
+int l;
+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 */

Mercurial > hg > xemacs-beta

comparison src/unexaix.c @ 0:376386a54a3c r19-14