Import Upstream version 5b3upstream/5b3

1 files changed, 495 insertions, 0 deletions

diff --git a/unexalpha.c b/unexalpha.c
new file mode 100644
index 0000000..2adfd1f
--- /dev/null
+++ b/unexalpha.c
@@ -0,0 +1,495 @@
+/* Unexec for DEC alpha.  schoepf@sc.ZIB-Berlin.DE (Rainer Schoepf).
+
+   Copyright (C) 1994 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 2, 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; see the file COPYING.  If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+
+#include <config.h>
+#include <sys/types.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <stdio.h>
+#include <varargs.h>
+#include <filehdr.h>
+#include <aouthdr.h>
+#include <scnhdr.h>
+#include <syms.h>
+#ifndef __linux__
+# include <reloc.h>
+# include <elf_abi.h>
+#endif
+
+static void fatal_unexec ();
+static void mark_x ();
+
+#define READ(_fd, _buffer, _size, _error_message, _error_arg) \
+	errno = EEOF; \
+	if (read (_fd, _buffer, _size) != _size) \
+	  fatal_unexec (_error_message, _error_arg);
+
+#define WRITE(_fd, _buffer, _size, _error_message, _error_arg) \
+	if (write (_fd, _buffer, _size) != _size) \
+	  fatal_unexec (_error_message, _error_arg);
+
+#define SEEK(_fd, _position, _error_message, _error_arg) \
+	errno = EEOF; \
+	if (lseek (_fd, _position, L_SET) != _position) \
+	  fatal_unexec (_error_message, _error_arg);
+
+extern int errno;
+extern char *strerror ();
+
+void *sbrk ();
+
+#define EEOF -1
+
+static struct scnhdr *text_section;
+static struct scnhdr *rel_dyn_section;
+static struct scnhdr *dynstr_section;
+static struct scnhdr *dynsym_section;
+static struct scnhdr *init_section;
+static struct scnhdr *finit_section;
+static struct scnhdr *rdata_section;
+static struct scnhdr *rconst_section;
+static struct scnhdr *data_section;
+static struct scnhdr *pdata_section;
+static struct scnhdr *xdata_section;
+static struct scnhdr *got_section;
+static struct scnhdr *lit8_section;
+static struct scnhdr *lit4_section;
+static struct scnhdr *sdata_section;
+static struct scnhdr *sbss_section;
+static struct scnhdr *bss_section;
+
+static struct scnhdr old_data_scnhdr;
+
+static unsigned long Brk;
+
+struct headers {
+    struct filehdr fhdr;
+    struct aouthdr aout;
+    struct scnhdr section[_MIPS_NSCNS_MAX];
+};
+
+
+
+/* Define name of label for entry point for the dumped executable.  */
+
+#ifndef DEFAULT_ENTRY_ADDRESS
+#define DEFAULT_ENTRY_ADDRESS __start
+#endif
+
+unexec (new_name, a_name, data_start, bss_start, entry_address)
+     char *new_name, *a_name;
+     unsigned long data_start, bss_start, entry_address;
+{
+  int new, old;
+  char * oldptr;
+  struct headers ohdr, nhdr;
+  struct stat stat;
+  long pagesize, brk;
+  long newsyms, symrel;
+  int nread;
+  int i;
+  long vaddr, scnptr;
+#define BUFSIZE 8192
+  char buffer[BUFSIZE];
+
+  if ((old = open (a_name, O_RDONLY)) < 0)
+    fatal_unexec ("opening %s", a_name);
+
+  new = creat (new_name, 0666);
+  if (new < 0) fatal_unexec ("creating %s", new_name);
+
+  if ((fstat (old, &stat) == -1))
+    fatal_unexec ("fstat %s", a_name);
+
+  oldptr = (char *)mmap (0, stat.st_size, PROT_READ, MAP_FILE|MAP_SHARED, old, 0);
+
+  if (oldptr == (char *)-1)
+    fatal_unexec ("mmap %s", a_name);
+
+  close (old);
+
+  /* This is a copy of the a.out header of the original executable */
+
+  ohdr = (*(struct headers *)oldptr);
+
+  /* This is where we build the new header from the in-memory copy */
+
+  nhdr = *((struct headers *)TEXT_START);
+
+  /* First do some consistency checks */
+
+  if (nhdr.fhdr.f_magic != ALPHAMAGIC
+      && nhdr.fhdr.f_magic != ALPHAUMAGIC)
+    {
+      fprintf (stderr, "unexec: input file magic number is %x, not %x or %x.\n",
+	       nhdr.fhdr.f_magic, ALPHAMAGIC, ALPHAUMAGIC);
+      exit (1);
+    }
+
+  if (nhdr.fhdr.f_opthdr != sizeof (nhdr.aout))
+    {
+      fprintf (stderr, "unexec: input a.out header is %d bytes, not %d.\n",
+	       nhdr.fhdr.f_opthdr, sizeof (nhdr.aout));
+      exit (1);
+    }
+  if (nhdr.aout.magic != ZMAGIC)
+    {
+      fprintf (stderr, "unexec: input file a.out magic number is %o, not %o.\n",
+	       nhdr.aout.magic, ZMAGIC);
+      exit (1);
+    }
+
+
+  /* Now check the existence of certain header section and grab
+     their addresses. */
+
+#define CHECK_SCNHDR(ptr, name, flags)					\
+  ptr = NULL;								\
+  for (i = 0; i < nhdr.fhdr.f_nscns && !ptr; i++)			\
+    if (strncmp (nhdr.section[i].s_name, name, 8) == 0)			\
+      {									\
+	if (nhdr.section[i].s_flags != flags)				\
+	  fprintf (stderr, "unexec: %x flags (%x expected) in %s section.\n", \
+		   nhdr.section[i].s_flags, flags, name);		\
+	ptr = nhdr.section + i;						\
+      }									\
+
+  CHECK_SCNHDR (text_section,  _TEXT,  STYP_TEXT);
+  CHECK_SCNHDR (init_section,  _INIT,  STYP_INIT);
+#ifdef _REL_DYN
+  CHECK_SCNHDR (rel_dyn_section, _REL_DYN,  STYP_REL_DYN);
+#endif /* _REL_DYN */
+#ifdef _DYNSYM
+  CHECK_SCNHDR (dynsym_section, _DYNSYM,  STYP_DYNSYM);
+#endif /* _REL_DYN */
+#ifdef _DYNSTR
+  CHECK_SCNHDR (dynstr_section, _DYNSTR,  STYP_DYNSTR);
+#endif /* _REL_DYN */
+#ifdef _FINI
+  CHECK_SCNHDR (finit_section, _FINI,  STYP_FINI);
+#endif /* _FINI */
+  CHECK_SCNHDR (rdata_section, _RDATA, STYP_RDATA);
+#ifdef _RCONST
+  CHECK_SCNHDR (rconst_section, _RCONST, STYP_RCONST);
+#endif
+#ifdef _PDATA
+  CHECK_SCNHDR (pdata_section, _PDATA, STYP_PDATA);
+#endif _PDATA
+#ifdef _GOT
+  CHECK_SCNHDR (got_section,   _GOT,   STYP_GOT);
+#endif _GOT
+  CHECK_SCNHDR (data_section,  _DATA,  STYP_DATA);
+#ifdef _XDATA
+  CHECK_SCNHDR (xdata_section, _XDATA, STYP_XDATA);
+#endif /* _XDATA */
+#ifdef _LIT8
+  CHECK_SCNHDR (lit8_section,  _LIT8,  STYP_LIT8);
+  CHECK_SCNHDR (lit4_section,  _LIT4,  STYP_LIT4);
+#endif /* _LIT8 */
+  CHECK_SCNHDR (sdata_section, _SDATA, STYP_SDATA);
+  CHECK_SCNHDR (sbss_section,  _SBSS,  STYP_SBSS);
+  CHECK_SCNHDR (bss_section,   _BSS,   STYP_BSS);
+
+
+  pagesize = getpagesize ();
+  brk = (((long) (sbrk (0))) + pagesize - 1) & (-pagesize);
+
+  /* Remember the current break */
+
+  Brk = brk;
+
+  bcopy (data_section, &old_data_scnhdr, sizeof (old_data_scnhdr));
+
+  nhdr.aout.dsize = brk - DATA_START;
+  nhdr.aout.bsize = 0;
+  if (entry_address == 0)
+    {
+      extern DEFAULT_ENTRY_ADDRESS ();
+      nhdr.aout.entry = (unsigned long)DEFAULT_ENTRY_ADDRESS;
+    }
+  else
+    nhdr.aout.entry = entry_address;
+
+  nhdr.aout.bss_start = nhdr.aout.data_start + nhdr.aout.dsize;
+
+  if (rdata_section != NULL)
+    {
+      rdata_section->s_size = data_start - DATA_START;
+
+      /* Adjust start and virtual addresses of rdata_section, too.  */
+      rdata_section->s_vaddr = DATA_START;
+      rdata_section->s_paddr = DATA_START;
+      rdata_section->s_scnptr = text_section->s_scnptr + nhdr.aout.tsize;
+    }
+
+  data_section->s_vaddr = data_start;
+  data_section->s_paddr = data_start;
+  data_section->s_size = brk - data_start;
+
+  if (rdata_section != NULL)
+    {
+      data_section->s_scnptr = rdata_section->s_scnptr + rdata_section->s_size;
+    }
+
+  vaddr = data_section->s_vaddr + data_section->s_size;
+  scnptr = data_section->s_scnptr + data_section->s_size;
+  if (lit8_section != NULL)
+    {
+      lit8_section->s_vaddr = vaddr;
+      lit8_section->s_paddr = vaddr;
+      lit8_section->s_size = 0;
+      lit8_section->s_scnptr = scnptr;
+    }
+  if (lit4_section != NULL)
+    {
+      lit4_section->s_vaddr = vaddr;
+      lit4_section->s_paddr = vaddr;
+      lit4_section->s_size = 0;
+      lit4_section->s_scnptr = scnptr;
+    }
+  if (sdata_section != NULL)
+    {
+      sdata_section->s_vaddr = vaddr;
+      sdata_section->s_paddr = vaddr;
+      sdata_section->s_size = 0;
+      sdata_section->s_scnptr = scnptr;
+    }
+#ifdef _XDATA
+  if (xdata_section != NULL)
+    {
+      xdata_section->s_vaddr = vaddr;
+      xdata_section->s_paddr = vaddr;
+      xdata_section->s_size = 0;
+      xdata_section->s_scnptr = scnptr;
+    }
+#endif
+#ifdef _GOT
+  if (got_section != NULL)
+    {
+      bcopy (got_section, buffer, sizeof (struct scnhdr));
+
+      got_section->s_vaddr = vaddr;
+      got_section->s_paddr = vaddr;
+      got_section->s_size = 0;
+      got_section->s_scnptr = scnptr;
+    }
+#endif /*_GOT */
+  if (sbss_section != NULL)
+    {
+      sbss_section->s_vaddr = vaddr;
+      sbss_section->s_paddr = vaddr;
+      sbss_section->s_size = 0;
+      sbss_section->s_scnptr = scnptr;
+    }
+  if (bss_section != NULL)
+    {
+      bss_section->s_vaddr = vaddr;
+      bss_section->s_paddr = vaddr;
+      bss_section->s_size = 0;
+      bss_section->s_scnptr = scnptr;
+    }
+
+  WRITE (new, (char *)TEXT_START, nhdr.aout.tsize,
+	 "writing text section to %s", new_name);
+  WRITE (new, (char *)DATA_START, nhdr.aout.dsize,
+	 "writing data section to %s", new_name);
+
+#ifdef _GOT
+#define old_got_section ((struct scnhdr *)buffer)
+
+  if (got_section != NULL)
+    {
+      SEEK (new, old_got_section->s_scnptr,
+	    "seeking to start of got_section in %s", new_name);
+      WRITE (new, oldptr + old_got_section->s_scnptr, old_got_section->s_size,
+	     "writing new got_section of %s", new_name);
+      SEEK (new, nhdr.aout.tsize + nhdr.aout.dsize,
+	    "seeking to end of data section of %s", new_name);
+    }
+
+#undef old_got_section
+#endif
+
+  /*
+   * Construct new symbol table header
+   */
+
+  bcopy (oldptr + nhdr.fhdr.f_symptr, buffer, cbHDRR);
+
+#define symhdr ((pHDRR)buffer)
+  newsyms = nhdr.aout.tsize + nhdr.aout.dsize;
+  symrel = newsyms - nhdr.fhdr.f_symptr;
+  nhdr.fhdr.f_symptr = newsyms;
+  symhdr->cbLineOffset += symrel;
+  symhdr->cbDnOffset += symrel;
+  symhdr->cbPdOffset += symrel;
+  symhdr->cbSymOffset += symrel;
+  symhdr->cbOptOffset += symrel;
+  symhdr->cbAuxOffset += symrel;
+  symhdr->cbSsOffset += symrel;
+  symhdr->cbSsExtOffset += symrel;
+  symhdr->cbFdOffset += symrel;
+  symhdr->cbRfdOffset += symrel;
+  symhdr->cbExtOffset += symrel;
+
+  WRITE (new, buffer, cbHDRR, "writing symbol table header of %s", new_name);
+
+  /*
+   * Copy the symbol table and line numbers
+   */
+  WRITE (new, oldptr + ohdr.fhdr.f_symptr + cbHDRR,
+	 stat.st_size - ohdr.fhdr.f_symptr - cbHDRR,
+	 "writing symbol table of %s", new_name);
+
+#ifndef __linux__
+  update_dynamic_symbols (oldptr, new_name, new, nhdr.aout);
+#endif
+
+#undef symhdr
+
+  SEEK (new, 0, "seeking to start of header in %s", new_name);
+  WRITE (new, &nhdr, sizeof (nhdr),
+	 "writing header of %s", new_name);
+
+  close (old);
+  close (new);
+  mark_x (new_name);
+}
+
+
+
+
+#ifndef __linux__
+
+update_dynamic_symbols (old, new_name, new, aout)
+     char *old;			/* Pointer to old executable */
+     char *new_name;            /* Name of new executable */
+     int new;			/* File descriptor for new executable */
+     struct aouthdr aout;	/* a.out info from the file header */
+{
+  typedef struct dynrel_info {
+    char * addr;
+    unsigned type:8;
+    unsigned index:24;
+    unsigned info:8;
+    unsigned pad:8;
+  } dr_info;
+
+  int nsyms = rel_dyn_section->s_size / sizeof (struct dynrel_info);
+  int i;
+  dr_info * rd_base = (dr_info *) (old + rel_dyn_section->s_scnptr);
+  Elf32_Sym * ds_base = (Elf32_Sym *) (old + dynsym_section->s_scnptr);
+
+  for (i = 0; i < nsyms; i++) {
+    register Elf32_Sym x;
+
+    if (rd_base[i].index == 0)
+      continue;
+
+    x = ds_base[rd_base[i].index];
+
+#if 0
+      fprintf (stderr, "Object inspected: %s, addr = %lx, shndx = %x",
+	       old + dynstr_section->s_scnptr + x.st_name, rd_base[i].addr, x.st_shndx);
+#endif
+
+
+    if ((ELF32_ST_BIND (x.st_info) == STB_GLOBAL)
+	&& (x.st_shndx == 0)
+	/* && (x.st_value == NULL) */
+	) {
+      /* OK, this is probably a reference to an object in a shared
+	 library, so copy the old value. This is done in several steps:
+	 1. reladdr is the address of the location in question relative to
+            the start of the data section,
+         2. oldref is the addr is the mapped in temacs executable,
+         3. newref is the address of the location in question in the
+            undumped executable,
+         4. len is the size of the object reference in bytes --
+            currently only 4 (long) and 8 (quad) are supported.
+	    */
+      register unsigned long reladdr = rd_base[i].addr - old_data_scnhdr.s_vaddr;
+      char * oldref = old + old_data_scnhdr.s_scnptr + reladdr;
+      unsigned long newref = aout.tsize + reladdr;
+      int len;
+
+#if 0
+      fprintf (stderr, "...relocated\n");
+#endif
+
+      if (rd_base[i].type == R_REFLONG) 
+	len = 4;
+      else if (rd_base[i].type == R_REFQUAD) 
+	len = 8;
+      else
+	fatal_unexec ("unrecognized relocation type in .dyn.rel section (symbol #%d)", i);
+
+      SEEK (new, newref, "seeking to dynamic symbol in %s", new_name);
+      WRITE (new, oldref, len, "writing old dynrel info in %s", new_name);
+    }
+
+#if 0
+    else
+      fprintf (stderr, "...not relocated\n");
+#endif
+
+  }
+
+}
+
+#endif /* !__linux__ */
+
+
+/*
+ * mark_x
+ *
+ * After successfully building the new a.out, mark it executable
+ */
+
+static void
+mark_x (name)
+     char *name;
+{
+  struct stat sbuf;
+  int um = umask (777);
+  umask (um);
+  if (stat (name, &sbuf) < 0)
+    fatal_unexec ("getting protection on %s", name);
+  sbuf.st_mode |= 0111 & ~um;
+  if (chmod (name, sbuf.st_mode) < 0)
+    fatal_unexec ("setting protection on %s", name);
+}
+
+static void
+fatal_unexec (s, arg)
+     char *s;
+     char *arg;
+{
+  if (errno == EEOF)
+    fputs ("unexec: unexpected end of file, ", stderr);
+  else
+    fprintf (stderr, "unexec: %s, ", strerror (errno));
+  fprintf (stderr, s, arg);
+  fputs (".\n", stderr);
+  exit (1);
+}