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- /* Copyright (C) 1985, 1986, 1987, 1988 Free Software Foundation, Inc.
-
- NO WARRANTY
-
- BECAUSE THIS PROGRAM IS LICENSED FREE OF CHARGE, WE PROVIDE ABSOLUTELY
- NO WARRANTY, TO THE EXTENT PERMITTED BY APPLICABLE STATE LAW. EXCEPT
- WHEN OTHERWISE STATED IN WRITING, FREE SOFTWARE FOUNDATION, INC,
- RICHARD M. STALLMAN AND/OR OTHER PARTIES PROVIDE THIS PROGRAM "AS IS"
- WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
- BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
- FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY
- AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE
- DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
- CORRECTION.
-
- IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL RICHARD M.
- STALLMAN, THE FREE SOFTWARE FOUNDATION, INC., AND/OR ANY OTHER PARTY
- WHO MAY MODIFY AND REDISTRIBUTE THIS PROGRAM AS PERMITTED BELOW, BE
- LIABLE TO YOU FOR DAMAGES, INCLUDING ANY LOST PROFITS, LOST MONIES, OR
- OTHER SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
- USE OR INABILITY TO USE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR
- DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY THIRD PARTIES OR
- A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS) THIS
- PROGRAM, EVEN IF YOU HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
- DAMAGES, OR FOR ANY CLAIM BY ANY OTHER PARTY.
-
- GENERAL PUBLIC LICENSE TO COPY
-
- 1. You may copy and distribute verbatim copies of this source file
- as you receive it, in any medium, provided that you conspicuously and
- appropriately publish on each copy a valid copyright notice "Copyright
- (C) 1987 Free Software Foundation, Inc."; and include following the
- copyright notice a verbatim copy of the above disclaimer of warranty
- and of this License. You may charge a distribution fee for the
- physical act of transferring a copy.
-
- 2. You may modify your copy or copies of this source file or
- any portion of it, and copy and distribute such modifications under
- the terms of Paragraph 1 above, provided that you also do the following:
-
- a) cause the modified files to carry prominent notices stating
- that you changed the files and the date of any change; and
-
- b) cause the whole of any work that you distribute or publish,
- that in whole or in part contains or is a derivative of this
- program or any part thereof, to be licensed at no charge to all
- third parties on terms identical to those contained in this
- License Agreement (except that you may choose to grant more extensive
- warranty protection to some or all third parties, at your option).
-
- c) You may charge a distribution fee for the physical act of
- transferring a copy, and you may at your option offer warranty
- protection in exchange for a fee.
-
- Mere aggregation of another unrelated program with this program (or its
- derivative) on a volume of a storage or distribution medium does not bring
- the other program under the scope of these terms.
-
- 3. You may copy and distribute this program (or a portion or derivative
- of it, under Paragraph 2) in object code or executable form under the terms
- of Paragraphs 1 and 2 above provided that you also do one of the following:
-
- a) accompany it with the complete corresponding machine-readable
- source code, which must be distributed under the terms of
- Paragraphs 1 and 2 above; or,
-
- b) accompany it with a written offer, valid for at least three
- years, to give any third party free (except for a nominal
- shipping charge) a complete machine-readable copy of the
- corresponding source code, to be distributed under the terms of
- Paragraphs 1 and 2 above; or,
-
- c) accompany it with the information you received as to where the
- corresponding source code may be obtained. (This alternative is
- allowed only for noncommercial distribution and only if you
- received the program in object code or executable form alone.)
-
- For an executable file, complete source code means all the source code for
- all modules it contains; but, as a special exception, it need not include
- source code for modules which are standard libraries that accompany the
- operating system on which the executable file runs.
-
- 4. You may not copy, sublicense, distribute or transfer this program
- except as expressly provided under this License Agreement. Any attempt
- otherwise to copy, sublicense, distribute or transfer this program is void and
- your rights to use the program under this License agreement shall be
- automatically terminated. However, parties who have received computer
- software programs from you with this License Agreement will not have
- their licenses terminated so long as such parties remain in full compliance.
-
- 5. If you wish to incorporate parts of this program into other free
- programs whose distribution conditions are different, write to the Free
- Software Foundation at 675 Mass Ave, Cambridge, MA 02139. We have not yet
- worked out a simple rule that can be stated here, but we will often permit
- this. We will be guided by the two goals of preserving the free status of
- all derivatives of our free software and of promoting the sharing and reuse of
- software.
-
-
- In other words, you are welcome to use, share and improve this program.
- You are forbidden to forbid anyone else to use, share and improve
- what you give them. Help stamp out software-hoarding! */
-
-
- /*
- * 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.
- *
- * 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.
-
- */
-
- /* This is a MODIFIED version of GNU-emacs unexec.c. Modifications include:
- - Some real modifications to facilate the interface to SWI-Prolog, tagged
- with (JW)
- - Added some declarations to make GCC -Wall quiet
- */
-
- #ifndef emacs
- #ifndef PERROR /* added this condition (JW) */
- #define PERROR(arg) perror (arg); return -1
- #endif
- #else
- #include "config.h"
- #define PERROR(file) report_error (file, new)
- #endif
-
- #ifndef CANNOT_DUMP /* all rest of file! */
-
- #ifndef CANNOT_UNEXEC /* most of rest of file */
-
- /* #include <a.out.h> Deleted; already done (JW) */
- /* 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>
- #if !gould
- #include <unistd.h>
- #endif
-
- #if !ANSI
- extern int creat(); /* Unix functions (added by (JW)) */
- extern int unlink();
- extern int stat();
- extern int chmod();
- #endif
-
- static int make_hdr();
- static int copy_text_and_data();
- static int copy_sym();
- static int mark_x();
- static int write_segment();
-
- #ifdef COFF
- #ifndef USG
- #ifndef STRIDE
- #ifndef UMAX
- #ifndef sun386
- #ifndef gould
- /* 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 gould */
- #endif /* not sun386 */
- #endif /* not UMAX */
- #endif /* Not STRIDE */
- #endif /* not USG */
- static long block_copy_start; /* Old executable start point */
- 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 */
- #define SYMS_START block_copy_start
-
- static long text_scnptr;
- static long data_scnptr;
-
- #else /* not COFF */
-
- extern char *sbrk ();
-
- #define SYMS_START ((long) N_SYMOFF (shdr))
-
- /* Some machines override the structure name for an a.out header. */
- #ifndef EXEC_HDR_TYPE
- #define EXEC_HDR_TYPE struct exec
- #endif
-
- #ifdef HPUX
- #ifdef HP9000S200_ID
- #define MY_ID HP9000S200_ID
- #else
- #include <model.h>
- #define MY_ID MYSYS
- #endif /* no HP9000S200_ID */
- static MAGIC OLDMAGIC = {MY_ID, SHARE_MAGIC};
- static MAGIC NEWMAGIC = {MY_ID, DEMAND_MAGIC};
- #define N_TXTOFF(x) TEXT_OFFSET(x)
- #define N_SYMOFF(x) LESYM_OFFSET(x)
- static EXEC_HDR_TYPE hdr, ohdr, shdr;
-
- #else /* not HPUX */
-
- #if defined (USG) && !defined (IBMRTAIX) && !defined (IRIS)
- static struct bhdr hdr, ohdr, shdr;
- #define a_magic fmagic
- #define a_text tsize
- #define a_data dsize
- #define a_bss bsize
- #define a_syms ssize
- #define a_trsize rtsize
- #define a_drsize rdsize
- #define a_entry entry
- #define N_BADMAG(x) \
- (((x).fmagic)!=OMAGIC && ((x).fmagic)!=NMAGIC &&\
- ((x).fmagic)!=FMAGIC && ((x).fmagic)!=IMAGIC)
- #define NEWMAGIC FMAGIC
- #else /* IRIS or IBMRTAIX or not USG */
- static EXEC_HDR_TYPE hdr, ohdr, shdr;
- #define NEWMAGIC ZMAGIC
- #endif /* IRIS or IBMRTAIX not USG */
- #endif /* not HPUX */
-
- static int unexec_text_start;
- static int unexec_data_start;
-
- #endif /* not 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
-
- static
- report_error (file, fd)
- char *file;
- int fd;
- {
- if (fd)
- close (fd);
- error ("Failure operating on %s", file);
- }
- #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 void
- 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
- }
-
- /* ****************************************************************
- * unexec
- *
- * driving logic.
- */
- int
- unexec (new_name, a_name, s_name, data_start, bss_start, entry_address)
- char *new_name, *a_name, *s_name;
- unsigned data_start, bss_start, entry_address;
- {
- int new, s_out = -1, a_out = -1;
-
- if (a_name && (a_out = open (a_name, 0)) < 0)
- {
- PERROR (a_name);
- }
- if (s_name && (s_out = open (s_name, 0)) < 0 )
- {
- PERROR (s_name);
- }
- if ((new = creat (new_name, 0666)) < 0)
- {
- PERROR (new_name);
- }
-
- if (make_hdr (new, a_out, s_out, data_start, bss_start, entry_address,
- a_name, s_name, new_name) < 0
- || copy_text_and_data (new) < 0
- || copy_sym (new, s_out >= 0 ? s_out : a_out, a_name, new_name) < 0
- #ifdef COFF
- || adjust_lnnoptrs (new, a_out, 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);
- if (s_out >= 0)
- close (s_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, s_out, data_start, bss_start, entry_address, a_name, s_name, new_name)
- int new, a_out, s_out;
- unsigned data_start, bss_start, entry_address;
- char *a_name, *s_name;
- char *new_name;
- {
- #ifdef COFF
- auto struct scnhdr f_thdr; /* Text section header */
- auto struct scnhdr f_dhdr; /* Data section header */
- auto struct scnhdr f_bhdr; /* Bss section header */
- auto struct scnhdr scntemp; /* Temporary section header */
- register int scns;
- #endif /* COFF */
- unsigned int bss_end;
-
- pagemask = getpagesize () - 1;
-
- /* Adjust text/data boundary. */
- #ifdef NO_REMAP
- data_start = (int) start_of_data ();
- #else /* not NO_REMAP */
- if (!data_start)
- data_start = (int) start_of_data ();
- #endif /* not 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 */
- if (a_out >= 0)
- {
- if (read (a_out, &f_hdr, sizeof (f_hdr)) != sizeof (f_hdr))
- {
- PERROR (a_name);
- }
- block_copy_start += sizeof (f_hdr);
- if (f_hdr.f_opthdr > 0)
- {
- if (read (a_out, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
- {
- PERROR (a_name);
- }
- block_copy_start += sizeof (f_ohdr);
- }
- /* Loop through section headers, copying them in */
- for (scns = f_hdr.f_nscns; scns > 0; scns--) {
- if (read (a_out, &scntemp, sizeof (scntemp)) != sizeof (scntemp))
- {
- PERROR (a_name);
- }
- if (scntemp.s_scnptr > 0L)
- {
- if (block_copy_start < scntemp.s_scnptr + scntemp.s_size)
- block_copy_start = scntemp.s_scnptr + scntemp.s_size;
- }
- if (strcmp (scntemp.s_name, ".text") == 0)
- {
- f_thdr = scntemp;
- }
- else if (strcmp (scntemp.s_name, ".data") == 0)
- {
- f_dhdr = scntemp;
- }
- else if (strcmp (scntemp.s_name, ".bss") == 0)
- {
- f_bhdr = scntemp;
- }
- }
- }
- else
- {
- ERROR0 ("can't build a COFF file from scratch yet");
- }
-
- /* Now we alter the contents of all the f_*hdr variables
- to correspond to what we want to dump. */
-
- f_hdr.f_flags |= (F_RELFLG | F_EXEC);
- #ifdef EXEC_MAGIC
- f_ohdr.magic = EXEC_MAGIC;
- #endif
- #ifndef NO_REMAP
- f_ohdr.text_start = (long) start_of_text ();
- f_ohdr.tsize = data_start - f_ohdr.text_start;
- f_ohdr.data_start = data_start;
- #endif /* NO_REMAP */
- f_ohdr.dsize = bss_start - f_ohdr.data_start;
- f_ohdr.bsize = bss_end - bss_start;
- f_thdr.s_size = f_ohdr.tsize;
- f_thdr.s_scnptr = sizeof (f_hdr) + sizeof (f_ohdr);
- f_thdr.s_scnptr += (f_hdr.f_nscns) * (sizeof (f_thdr));
- lnnoptr = f_thdr.s_lnnoptr;
- #ifdef SECTION_ALIGNMENT
- /* Some systems require special alignment
- of the sections in the file itself. */
- f_thdr.s_scnptr
- = (f_thdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
- #endif /* SECTION_ALIGNMENT */
- text_scnptr = f_thdr.s_scnptr;
- f_dhdr.s_paddr = f_ohdr.data_start;
- f_dhdr.s_vaddr = f_ohdr.data_start;
- f_dhdr.s_size = f_ohdr.dsize;
- f_dhdr.s_scnptr = f_thdr.s_scnptr + f_thdr.s_size;
- #ifdef SECTION_ALIGNMENT
- /* Some systems require special alignment
- of the sections in the file itself. */
- f_dhdr.s_scnptr
- = (f_dhdr.s_scnptr + SECTION_ALIGNMENT) & ~SECTION_ALIGNMENT;
- #endif /* SECTION_ALIGNMENT */
- #ifdef DATA_SECTION_ALIGNMENT
- /* Some systems require special alignment
- of the data section only. */
- f_dhdr.s_scnptr
- = (f_dhdr.s_scnptr + DATA_SECTION_ALIGNMENT) & ~DATA_SECTION_ALIGNMENT;
- #endif /* DATA_SECTION_ALIGNMENT */
- data_scnptr = f_dhdr.s_scnptr;
- f_bhdr.s_paddr = f_ohdr.data_start + f_ohdr.dsize;
- f_bhdr.s_vaddr = f_ohdr.data_start + f_ohdr.dsize;
- f_bhdr.s_size = f_ohdr.bsize;
- f_bhdr.s_scnptr = 0L;
- bias = f_dhdr.s_scnptr + f_dhdr.s_size - block_copy_start;
-
- if (f_hdr.f_symptr > 0L)
- {
- f_hdr.f_symptr += bias;
- }
-
- if (f_thdr.s_lnnoptr > 0L)
- {
- f_thdr.s_lnnoptr += bias;
- }
-
- #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 (write (new, &f_ohdr, sizeof (f_ohdr)) != sizeof (f_ohdr))
- {
- PERROR (new_name);
- }
-
- if (write (new, &f_thdr, sizeof (f_thdr)) != sizeof (f_thdr))
- {
- PERROR (new_name);
- }
-
- if (write (new, &f_dhdr, sizeof (f_dhdr)) != sizeof (f_dhdr))
- {
- PERROR (new_name);
- }
-
- if (write (new, &f_bhdr, sizeof (f_bhdr)) != sizeof (f_bhdr))
- {
- PERROR (new_name);
- }
- return (0);
-
- #else /* if not COFF */
-
- /* Get symbol table info from header of a.out file if given one. */
- if (a_out >= 0)
- {
- if (read (a_out, &ohdr, sizeof hdr) != sizeof hdr)
- {
- PERROR (a_name);
- }
-
- if (N_BADMAG (ohdr))
- {
- ERROR1 ("invalid magic number in %s", a_name);
- }
- hdr = ohdr;
- }
- else
- {
- bzero (hdr, sizeof hdr);
- }
-
- if ( s_out >= 0 )
- { if ( read(s_out, &shdr, sizeof(hdr)) != sizeof(hdr) )
- {
- PERROR(s_name);
- }
- hdr.a_syms = shdr.a_syms; /* copy symbol table sizes */
- }
- else
- {
- shdr = ohdr;
- }
-
- unexec_text_start = (long) start_of_text (&ohdr); /* Added &ohdr (JW) */
- unexec_data_start = data_start;
-
- /* Machine-dependent fixup for header, or maybe for unexec_text_start */
- #ifdef ADJUST_EXEC_HEADER
- ADJUST_EXEC_HEADER;
- #endif /* ADJUST_EXEC_HEADER */
-
- hdr.a_trsize = 0;
- hdr.a_drsize = 0;
- if (entry_address != 0)
- hdr.a_entry = entry_address;
-
- hdr.a_bss = bss_end - bss_start;
- hdr.a_data = bss_start - data_start;
- #ifdef NO_REMAP
- hdr.a_text = ohdr.a_text;
- #else /* not NO_REMAP */
- hdr.a_text = data_start - unexec_text_start;
-
- #ifdef A_TEXT_OFFSET
- hdr.a_text += A_TEXT_OFFSET (ohdr);
- #endif
-
- #endif /* not NO_REMAP */
-
- if (write (new, &hdr, sizeof hdr) != sizeof hdr)
- {
- PERROR (new_name);
- }
-
- #ifdef A_TEXT_OFFSET
- hdr.a_text -= A_TEXT_OFFSET (ohdr);
- #endif
-
- return 0;
-
- #endif /* not COFF */
- }
-
- /* ****************************************************************
- * 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 char *end;
- register char *ptr;
-
- #ifdef COFF
- lseek (new, (long) text_scnptr, 0);
- ptr = (char *) f_ohdr.text_start;
- end = ptr + f_ohdr.tsize;
- write_segment (new, ptr, end);
-
- lseek (new, (long) data_scnptr, 0);
- ptr = (char *) f_ohdr.data_start;
- end = ptr + f_ohdr.dsize;
- write_segment (new, ptr, end);
-
- #else /* if not COFF */
-
- /* Some machines count the header as part of the text segment.
- That is to say, the header appears in core
- just before the address that start_of_text () returns.
- For them, N_TXTOFF is the place where the header goes.
- We must adjust the seek to the place after the header.
- Note that at this point hdr.a_text does *not* count
- the extra A_TEXT_OFFSET bytes, only the actual bytes of code. */
-
- #ifdef A_TEXT_SEEK
- lseek (new, (long) A_TEXT_SEEK (hdr), 0);
- #else
- #ifdef A_TEXT_OFFSET
- /* Note that on the Sequent machine A_TEXT_OFFSET != sizeof (hdr)
- and sizeof (hdr) is the correct amount to add here. */
- /* In version 19, eliminate this case and use A_TEXT_SEEK whenever
- N_TXTOFF is not right. */
- lseek (new, (long) N_TXTOFF (hdr) + sizeof (hdr), 0);
- #else
- lseek (new, (long) N_TXTOFF (hdr), 0);
- #endif /* no A_TEXT_OFFSET */
- #endif /* no A_TEXT_SEEK */
-
- ptr = (char *) unexec_text_start;
- end = ptr + hdr.a_text;
- Putf("text: %ld ... ", end - ptr); pl_flush();
- write_segment (new, ptr, end);
-
- ptr = (char *) unexec_data_start;
- end = ptr + hdr.a_data;
- /* This lseek is certainly incorrect when A_TEXT_OFFSET
- and I believe it is a no-op otherwise.
- Let's see if its absence ever fails. */
- /* lseek (new, (long) N_TXTOFF (hdr) + hdr.a_text, 0); */
- Putf("data: %ld ... ", end - ptr); pl_flush();
- #ifdef HPUX
- lseek(new, DATA_OFFSET(hdr), 0); /* Added (JW) */
- #endif
- write_segment (new, ptr, end);
-
- #endif /* not COFF */
-
- return 0;
- }
-
- static int
- write_segment (new, ptr, end)
- int new;
- register char *ptr, *end;
- {
- register int i, nwrite, ret;
- char buf[80];
- extern int errno;
- char zeros[128];
-
- bzero (zeros, sizeof zeros);
-
- for (i = 0; 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",
- (unsigned) ptr, new, nwrite, ret, errno);
- PERROR (buf);
- }
- i += nwrite;
- ptr += nwrite;
- }
-
- return 0;
- }
-
- /* ****************************************************************
- * copy_sym
- *
- * Copy the relocation information and symbol table from the a.out to the new
- */
- static int
- copy_sym (new, s_out, a_name, new_name)
- int new, s_out;
- char *a_name, *new_name;
- {
- char page[1024];
- int n;
-
- if (s_out < 0)
- return 0;
-
- #ifdef COFF
- if (SYMS_START == 0L)
- return 0;
- #endif /* COFF */
-
- #ifdef COFF
- if (lnnoptr) /* if there is line number info */
- lseek (s_out, lnnoptr, 0); /* start copying from there */
- else
- #endif /* COFF */
- lseek (s_out, SYMS_START, 0); /* Position a.out to symtab. */
-
- Putf("symbols ... "); pl_flush();
- while ((n = read (s_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 int
- mark_x (name)
- char *name;
- {
- struct stat sbuf;
- int um;
- #ifdef emacs /* (JW) */
- int new = 0; /* for PERROR */
- #endif
-
- 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.
- */
-
- #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 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_numaux)
- {
- read (new, &auxentry, AUXESZ);
- nsyms++;
- if (ISFCN (symentry.n_type)) {
- auxentry.x_sym.x_fcnary.x_fcn.x_lnnoptr += bias;
- lseek (new, -AUXESZ, 1);
- write (new, &auxentry, AUXESZ);
- }
- }
- }
- close (new);
- }
-
- #endif /* COFF */
-
- #endif /* not CANNOT_UNEXEC */
-
- #endif /* not CANNOT_DUMP */
-