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-rw-r--r--src/unexaix.c611
1 files changed, 0 insertions, 611 deletions
diff --git a/src/unexaix.c b/src/unexaix.c
deleted file mode 100644
index 90c6cb7470c..00000000000
--- a/src/unexaix.c
+++ /dev/null
@@ -1,611 +0,0 @@
-/* Dump an executable file.
- Copyright (C) 1985-1988, 1999, 2001-2025 Free Software Foundation,
- Inc.
-
-This file is part of GNU Emacs.
-
-GNU Emacs is free software: you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation, either version 3 of the License, or (at
-your option) any later version.
-
-GNU Emacs is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
-
-/*
-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! */
-
-
-/* Originally based on the COFF unexec.c by Spencer W. Thomas.
- *
- * Subsequently hacked on by
- * Bill Mann <Bill_Man@praxisint.com>
- * Andrew Vignaux <Andrew.Vignaux@comp.vuw.ac.nz>
- * Mike Sperber <sperber@informatik.uni-tuebingen.de>
- *
- * Synopsis:
- * unexec (const char *new_name, const *old_name);
- *
- * 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.
- *
- */
-
-#include <config.h>
-#include "unexec.h"
-#include "lisp.h"
-
-#define PERROR(file) report_error (file, new)
-#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"
-
-#include <sys/types.h>
-#include <inttypes.h>
-#include <stdarg.h>
-#include <stdio.h>
-#include <errno.h>
-#include <unistd.h>
-#include <fcntl.h>
-
-extern char _data[];
-extern char _text[];
-
-#include <filehdr.h>
-#include <aouthdr.h>
-#include <scnhdr.h>
-#include <syms.h>
-
-static struct filehdr f_hdr; /* File header */
-static struct aouthdr f_ohdr; /* Optional file header (a.out) */
-static off_t bias; /* Bias to add for growth */
-static off_t lnnoptr; /* Pointer to line-number info within file */
-
-static off_t text_scnptr;
-static off_t data_scnptr;
-#define ALIGN(val, pwr) (((val) + ((1L<<(pwr))-1)) & ~((1L<<(pwr))-1))
-static off_t load_scnptr;
-static off_t orig_load_scnptr;
-static off_t orig_data_scnptr;
-static int unrelocate_symbols (int, int, const char *, const char *);
-
-#ifndef MAX_SECTIONS
-#define MAX_SECTIONS 10
-#endif
-
-static int adjust_lnnoptrs (int, int, const char *);
-
-static int pagemask;
-
-#include "lisp.h"
-
-static _Noreturn void
-report_error (const char *file, int fd)
-{
- int err = errno;
- if (fd)
- emacs_close (fd);
- report_file_errno ("Cannot unexec", build_string (file), err);
-}
-
-#define ERROR0(msg) report_error_1 (new, msg)
-#define ERROR1(msg,x) report_error_1 (new, msg, x)
-#define ERROR2(msg,x,y) report_error_1 (new, msg, x, y)
-
-static _Noreturn void ATTRIBUTE_FORMAT_PRINTF (2, 3)
-report_error_1 (int fd, const char *msg, ...)
-{
- va_list ap;
- emacs_close (fd);
- va_start (ap, msg);
- verror (msg, ap);
- va_end (ap);
-}
-
-static int make_hdr (int, int, const char *, const char *);
-static void mark_x (const char *);
-static int copy_text_and_data (int);
-static int copy_sym (int, int, const char *, const char *);
-static void write_segment (int, char *, char *);
-
-/* ****************************************************************
- * unexec
- *
- * driving logic.
- */
-void
-unexec (const char *new_name, const char *a_name)
-{
- int new = -1, a_out = -1;
-
- if (a_name && (a_out = emacs_open (a_name, O_RDONLY, 0)) < 0)
- {
- PERROR (a_name);
- }
- if ((new = emacs_open (new_name, O_WRONLY | O_CREAT | O_TRUNC, 0777)) < 0)
- {
- PERROR (new_name);
- }
- if (make_hdr (new, a_out,
- a_name, new_name) < 0
- || copy_text_and_data (new) < 0
- || copy_sym (new, a_out, a_name, new_name) < 0
- || adjust_lnnoptrs (new, a_out, new_name) < 0
- || unrelocate_symbols (new, a_out, a_name, new_name) < 0)
- {
- emacs_close (new);
- return;
- }
-
- emacs_close (new);
- if (a_out >= 0)
- emacs_close (a_out);
-}
-
-/* ****************************************************************
- * 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 (int new, int a_out,
- const char *a_name, const char *new_name)
-{
- int scns;
- uintptr_t bss_start;
- uintptr_t data_start;
-
- 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. */
- data_start = (uintptr_t) _data;
-
- data_start = data_start & ~pagemask; /* (Down) to page boundary. */
-
- bss_start = (uintptr_t) sbrk (0) + pagemask;
- bss_start &= ~ pagemask;
-
- if (data_start > bss_start) /* Can't have negative data size. */
- {
- ERROR2 (("unexec: data_start (0x%"PRIxPTR
- ") can't be greater than bss_start (0x%"PRIxPTR")"),
- data_start, bss_start);
- }
-
- /* 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);
-
- f_ohdr.dsize = bss_start - f_ohdr.data_start;
- f_ohdr.bsize = 0;
-
- 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 */
- {
- off_t 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;
-
- 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);
-}
-
-/* ****************************************************************
-
- *
- * Copy the text and data segments from memory to the new a.out
- */
-static int
-copy_text_and_data (int new)
-{
- char *end;
- char *ptr;
-
- lseek (new, text_scnptr, SEEK_SET);
- ptr = _text;
- end = ptr + f_ohdr.tsize;
- write_segment (new, ptr, end);
-
- lseek (new, data_scnptr, SEEK_SET);
- ptr = (char *) (ptrdiff_t) f_ohdr.data_start;
- end = ptr + f_ohdr.dsize;
- write_segment (new, ptr, end);
-
- return 0;
-}
-
-#define UnexBlockSz (1<<12) /* read/write block size */
-static void
-write_segment (int new, char *ptr, char *end)
-{
- int i, nwrite, ret;
- char zeros[UnexBlockSz];
-
- for (i = 0; ptr < end;)
- {
- /* distance to next block. */
- nwrite = (((ptrdiff_t) ptr + UnexBlockSz) & -UnexBlockSz) - (ptrdiff_t) 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)
- {
- memset (zeros, 0, nwrite);
- write (new, zeros, nwrite);
- }
- else if (nwrite != ret)
- {
- int write_errno = errno;
- char buf[1000];
- void *addr = ptr;
- sprintf (buf,
- "unexec write failure: addr %p, fileno %d, size 0x%x, wrote 0x%x, errno %d",
- addr, new, nwrite, ret, errno);
- errno = write_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 (int new, int a_out, const char *a_name, const char *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, SEEK_SET); /* start copying from there */
- else
- lseek (a_out, orig_load_scnptr, SEEK_SET); /* 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;
-}
-
-static int
-adjust_lnnoptrs (int writedesc, int readdesc, const char *new_name)
-{
- int nsyms;
- int naux;
- int new;
- struct syment symentry;
- union auxent auxentry;
-
- if (!lnnoptr || !f_hdr.f_symptr)
- return 0;
-
- if ((new = emacs_open (new_name, O_RDWR, 0)) < 0)
- {
- PERROR (new_name);
- return -1;
- }
-
- lseek (new, f_hdr.f_symptr, SEEK_SET);
- 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, SEEK_CUR);
- 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, SEEK_CUR);
- write (new, &auxentry, AUXESZ);
- }
- }
- }
- emacs_close (new);
-
- return 0;
-}
-
-static int
-unrelocate_symbols (int new, int a_out,
- const char *a_name, const char *new_name)
-{
- int i;
- LDHDR ldhdr;
- LDREL ldrel;
- off_t t_reloc = (intptr_t) _text - f_ohdr.text_start;
-#ifndef ALIGN_DATA_RELOC
- off_t d_reloc = (intptr_t) _data - f_ohdr.data_start;
-#else
- /* This worked (and was needed) before AIX 4.2.
- I have no idea why. -- Mike */
- off_t d_reloc = (intptr_t) _data - ALIGN (f_ohdr.data_start, 2);
-#endif
- int * p;
-
- if (load_scnptr == 0)
- return 0;
-
- lseek (a_out, orig_load_scnptr, SEEK_SET);
- if (read (a_out, &ldhdr, sizeof (ldhdr)) != sizeof (ldhdr))
- {
- PERROR (new_name);
- }
-
-#define SYMNDX_TEXT 0
-#define SYMNDX_DATA 1
-#define SYMNDX_BSS 2
-
- for (i = 0; i < ldhdr.l_nreloc; i++)
- {
- lseek (a_out,
- orig_load_scnptr + LDHDRSZ + LDSYMSZ*ldhdr.l_nsyms + LDRELSZ*i,
- SEEK_SET);
-
- if (read (a_out, &ldrel, LDRELSZ) != LDRELSZ)
- {
- PERROR (a_name);
- }
-
- /* 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,
- SEEK_SET);
-
- 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),
- SEEK_SET);
-
- if (read (a_out, (void *) &orig_int, sizeof (orig_int))
- != sizeof (orig_int))
- {
- PERROR (a_name);
- }
-
- p = (int *) (intptr_t) (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),
- SEEK_SET);
- if (write (new, (void *) &orig_int, sizeof (orig_int))
- != sizeof (orig_int))
- {
- PERROR (new_name);
- }
- }
- }
- }
- return 0;
-}
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