use modutils for non Intel arch's

1 files changed, 354 insertions, 0 deletions

diff --git a/mdk-stage1/insmod-modutils/obj/obj_load.c b/mdk-stage1/insmod-modutils/obj/obj_load.c
new file mode 100644
index 000000000..4db20a998
--- /dev/null
+++ b/mdk-stage1/insmod-modutils/obj/obj_load.c
@@ -0,0 +1,354 @@
+/* Elf file reader.
+   Copyright 1996, 1997 Linux International.
+
+   Contributed by Richard Henderson <rth@tamu.edu>
+   obj_free() added by Björn Ekwall <bj0rn@blox.se> March 1999
+   Support for kallsyms Keith Owens <kaos@ocs.com.au> April 2000
+
+   This file is part of the Linux modutils.
+
+   This program 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 of the License, or (at your
+   option) any later version.
+
+   This program 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 this program; if not, write to the Free Software Foundation,
+   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ident "$Id$"
+
+#include <alloca.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "obj.h"
+#include "util.h"
+
+/*======================================================================*/
+
+struct obj_file *
+obj_load (int fp, Elf32_Half e_type, const char *filename)
+{
+  struct obj_file *f;
+  ElfW(Shdr) *section_headers;
+  int shnum, i;
+  char *shstrtab;
+
+  /* Read the file header.  */
+
+  f = arch_new_file();
+  memset(f, 0, sizeof(*f));
+  f->symbol_cmp = strcmp;
+  f->symbol_hash = obj_elf_hash;
+  f->load_order_search_start = &f->load_order;
+
+  gzf_lseek(fp, 0, SEEK_SET);
+  if (gzf_read(fp, &f->header, sizeof(f->header)) != sizeof(f->header))
+    {
+      error("error reading ELF header %s: %m", filename);
+      return NULL;
+    }
+
+  if (f->header.e_ident[EI_MAG0] != ELFMAG0
+      || f->header.e_ident[EI_MAG1] != ELFMAG1
+      || f->header.e_ident[EI_MAG2] != ELFMAG2
+      || f->header.e_ident[EI_MAG3] != ELFMAG3)
+    {
+      error("%s is not an ELF file", filename);
+      return NULL;
+    }
+  if (f->header.e_ident[EI_CLASS] != ELFCLASSM
+      || f->header.e_ident[EI_DATA] != ELFDATAM
+      || f->header.e_ident[EI_VERSION] != EV_CURRENT
+      || !MATCH_MACHINE(f->header.e_machine))
+    {
+      error("ELF file %s not for this architecture", filename);
+      return NULL;
+    }
+  if (f->header.e_type != e_type && e_type != ET_NONE)
+    {
+      switch (e_type) {
+      case ET_REL:
+	error("ELF file %s not a relocatable object", filename);
+	break;
+      case ET_EXEC:
+	error("ELF file %s not an executable object", filename);
+	break;
+      default:
+	error("ELF file %s has wrong type, expecting %d got %d",
+		filename, e_type, f->header.e_type);
+	break;
+      }
+      return NULL;
+    }
+
+  /* Read the section headers.  */
+
+  if (f->header.e_shentsize != sizeof(ElfW(Shdr)))
+    {
+      error("section header size mismatch %s: %lu != %lu",
+	    filename,
+	    (unsigned long)f->header.e_shentsize,
+	    (unsigned long)sizeof(ElfW(Shdr)));
+      return NULL;
+    }
+
+  shnum = f->header.e_shnum;
+  f->sections = xmalloc(sizeof(struct obj_section *) * shnum);
+  memset(f->sections, 0, sizeof(struct obj_section *) * shnum);
+
+  section_headers = alloca(sizeof(ElfW(Shdr)) * shnum);
+  gzf_lseek(fp, f->header.e_shoff, SEEK_SET);
+  if (gzf_read(fp, section_headers, sizeof(ElfW(Shdr))*shnum) != sizeof(ElfW(Shdr))*shnum)
+    {
+      error("error reading ELF section headers %s: %m", filename);
+      return NULL;
+    }
+
+  /* Read the section data.  */
+
+  for (i = 0; i < shnum; ++i)
+    {
+      struct obj_section *sec;
+
+      f->sections[i] = sec = arch_new_section();
+      memset(sec, 0, sizeof(*sec));
+
+      sec->header = section_headers[i];
+      sec->idx = i;
+
+      switch (sec->header.sh_type)
+	{
+	case SHT_NULL:
+	case SHT_NOTE:
+	case SHT_NOBITS:
+	  /* ignore */
+	  break;
+
+	case SHT_PROGBITS:
+	case SHT_SYMTAB:
+	case SHT_STRTAB:
+	case SHT_RELM:
+	  if (sec->header.sh_size > 0)
+	    {
+	      sec->contents = xmalloc(sec->header.sh_size);
+	      gzf_lseek(fp, sec->header.sh_offset, SEEK_SET);
+	      if (gzf_read(fp, sec->contents, sec->header.sh_size) != sec->header.sh_size)
+		{
+		  error("error reading ELF section data %s: %m", filename);
+		  return NULL;
+		}
+	    }
+	  else
+	    sec->contents = NULL;
+	  break;
+
+#if SHT_RELM == SHT_REL
+	case SHT_RELA:
+	  if (sec->header.sh_size) {
+	    error("RELA relocations not supported on this architecture %s", filename);
+	    return NULL;
+	  }
+	  break;
+#else
+	case SHT_REL:
+	  if (sec->header.sh_size) {
+	    error("REL relocations not supported on this architecture %s", filename);
+	    return NULL;
+	  }
+	  break;
+#endif
+
+	default:
+	  if (sec->header.sh_type >= SHT_LOPROC)
+	    {
+	      if (arch_load_proc_section(sec, fp) < 0)
+		return NULL;
+	      break;
+	    }
+
+	  error("can't handle sections of type %ld %s",
+		(long)sec->header.sh_type, filename);
+	  return NULL;
+	}
+    }
+
+  /* Do what sort of interpretation as needed by each section.  */
+
+  shstrtab = f->sections[f->header.e_shstrndx]->contents;
+
+  for (i = 0; i < shnum; ++i)
+    {
+      struct obj_section *sec = f->sections[i];
+      sec->name = shstrtab + sec->header.sh_name;
+    }
+
+  for (i = 0; i < shnum; ++i)
+    {
+      struct obj_section *sec = f->sections[i];
+
+      /* .modinfo and .modstring should be contents only but gcc has no
+       *  attribute for that.  The kernel may have marked these sections as
+       *  ALLOC, ignore the allocate bit.
+       */
+      if (strcmp(sec->name, ".modinfo") == 0 ||
+	  strcmp(sec->name, ".modstring") == 0)
+	sec->header.sh_flags &= ~SHF_ALLOC;
+
+      if (sec->header.sh_flags & SHF_ALLOC)
+	obj_insert_section_load_order(f, sec);
+
+      switch (sec->header.sh_type)
+	{
+	case SHT_SYMTAB:
+	  {
+	    unsigned long nsym, j;
+	    char *strtab;
+	    ElfW(Sym) *sym;
+
+	    if (sec->header.sh_entsize != sizeof(ElfW(Sym)))
+	      {
+		error("symbol size mismatch %s: %lu != %lu",
+		      filename,
+		      (unsigned long)sec->header.sh_entsize,
+		      (unsigned long)sizeof(ElfW(Sym)));
+		return NULL;
+	      }
+
+	    nsym = sec->header.sh_size / sizeof(ElfW(Sym));
+	    strtab = f->sections[sec->header.sh_link]->contents;
+	    sym = (ElfW(Sym) *) sec->contents;
+
+	    /* Allocate space for a table of local symbols.  */
+	    j = f->local_symtab_size = sec->header.sh_info;
+	    f->local_symtab = xmalloc(j *= sizeof(struct obj_symbol *));
+	    memset(f->local_symtab, 0, j);
+
+	    /* Insert all symbols into the hash table.  */
+	    for (j = 1, ++sym; j < nsym; ++j, ++sym)
+	      {
+		const char *name;
+		if (sym->st_name)
+		  name = strtab+sym->st_name;
+		else
+		  name = f->sections[sym->st_shndx]->name;
+
+		obj_add_symbol(f, name, j, sym->st_info, sym->st_shndx,
+			       sym->st_value, sym->st_size);
+
+	      }
+	  }
+	break;
+	}
+    }
+
+  /* second pass to add relocation data to symbols */
+  for (i = 0; i < shnum; ++i)
+    {
+      struct obj_section *sec = f->sections[i];
+      switch (sec->header.sh_type)
+	{
+	case SHT_RELM:
+	  {
+	    unsigned long nrel, j;
+	    ElfW(RelM) *rel;
+	    struct obj_section *symtab;
+	    char *strtab;
+	    if (sec->header.sh_entsize != sizeof(ElfW(RelM)))
+	      {
+		error("relocation entry size mismatch %s: %lu != %lu",
+		      filename,
+		      (unsigned long)sec->header.sh_entsize,
+		      (unsigned long)sizeof(ElfW(RelM)));
+		return NULL;
+	      }
+
+	    nrel = sec->header.sh_size / sizeof(ElfW(RelM));
+	    rel = (ElfW(RelM) *) sec->contents;
+	    symtab = f->sections[sec->header.sh_link];
+	    strtab = f->sections[symtab->header.sh_link]->contents;
+
+	    /* Save the relocate type in each symbol entry.  */
+	    for (j = 0; j < nrel; ++j, ++rel)
+	      {
+		ElfW(Sym) *extsym;
+		struct obj_symbol *intsym;
+		unsigned long symndx;
+		symndx = ELFW(R_SYM)(rel->r_info);
+		if (symndx)
+		  {
+		    extsym = ((ElfW(Sym) *) symtab->contents) + symndx;
+		    if (ELFW(ST_BIND)(extsym->st_info) == STB_LOCAL)
+		      {
+			/* Local symbols we look up in the local table to be sure
+			   we get the one that is really intended.  */
+			intsym = f->local_symtab[symndx];
+		      }
+		    else
+		      {
+			/* Others we look up in the hash table.  */
+			const char *name;
+			if (extsym->st_name)
+			  name = strtab + extsym->st_name;
+			else
+			  name = f->sections[extsym->st_shndx]->name;
+			intsym = obj_find_symbol(f, name);
+		      }
+		    intsym->r_type = ELFW(R_TYPE)(rel->r_info);
+		  }
+	      }
+	  }
+	  break;
+	}
+    }
+
+  f->filename = xstrdup(filename);
+
+  return f;
+}
+
+void obj_free(struct obj_file *f)
+{
+	struct obj_section *sec;
+	struct obj_symbol *sym;
+	struct obj_symbol *next;
+	int i;
+	int n;
+
+	if (f->sections) {
+		n = f->header.e_shnum;
+		for (i = 0; i < n; ++i) {
+			if ((sec = f->sections[i]) != NULL) {
+				if (sec->contents)
+					free(sec->contents);
+				free(sec);
+			}
+		}
+		free(f->sections);
+	}
+
+	for (i = 0; i < HASH_BUCKETS; ++i) {
+		for (sym = f->symtab[i]; sym; sym = next) {
+			next = sym->next;
+			free(sym);
+		}
+	}
+
+	if (f->local_symtab)
+		free(f->local_symtab);
+
+	if (f->filename)
+		free((char *)(f->filename));
+
+	if (f->persist)
+		free((char *)(f->persist));
+
+	free(f);
+}