Initial checkin for ld.so. This is a combination of effort from Manuel Novoa

III and me.  I've been working on stripping out arch dependant stuff and
replacing it with generic stuff whenever possible.
 -Erik

1 files changed, 115 insertions, 0 deletions

diff --git a/ldso/util/readelf2.c b/ldso/util/readelf2.c
new file mode 100644
index 000000000..1bf47b7c6
--- /dev/null
+++ b/ldso/util/readelf2.c
@@ -0,0 +1,115 @@
+char *readsonameXX(char *name, FILE *infile, int expected_type, int *type)
+{
+  ElfW(Ehdr) *epnt;
+  ElfW(Phdr) *ppnt;
+  int i, j;
+  char *header;
+  ElfW(Word) dynamic_addr = 0;
+  ElfW(Word) dynamic_size = 0;
+  unsigned long page_size = getpagesize();
+  ElfW(Word) strtab_val = 0;
+  ElfW(Word) needed_val;
+  ElfW(Sword) loadaddr = -1;
+  ElfW(Dyn) *dpnt;
+  struct stat st;
+  char *needed;
+  char *soname = NULL;
+  int multi_libcs = 0;
+
+  if(expected_type == LIB_DLL)
+    {
+      warn("%s does not match type specified for directory!", name);
+      expected_type = LIB_ANY;
+    }
+
+  *type = LIB_ELF;
+
+  if (fstat(fileno(infile), &st))
+    return NULL;
+  header = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fileno(infile), 0);
+  if (header == (caddr_t)-1)
+    return NULL;
+
+  epnt = (ElfW(Ehdr) *)header;
+  if ((char *)(epnt+1) > (char *)(header + st.st_size))
+    goto skip;
+
+  ppnt = (ElfW(Phdr) *)&header[epnt->e_phoff];
+  if ((char *)ppnt < (char *)header ||
+      (char *)(ppnt+epnt->e_phnum) > (char *)(header + st.st_size))
+    goto skip;
+
+  for(i = 0; i < epnt->e_phnum; i++)
+  {
+    if (loadaddr == -1 && ppnt->p_type == PT_LOAD) 
+      loadaddr = (ppnt->p_vaddr & ~(page_size-1)) -
+	(ppnt->p_offset & ~(page_size-1));
+    if(ppnt->p_type == 2)
+    {
+      dynamic_addr = ppnt->p_offset;
+      dynamic_size = ppnt->p_filesz;
+    };
+    ppnt++;
+  };
+    
+  dpnt = (ElfW(Dyn) *) &header[dynamic_addr];
+  dynamic_size = dynamic_size / sizeof(ElfW(Dyn));
+  if ((char *)dpnt < (char *)header ||
+      (char *)(dpnt+dynamic_size) > (char *)(header + st.st_size))
+    goto skip;
+  
+  while (dpnt->d_tag != DT_NULL)
+  {
+    if (dpnt->d_tag == DT_STRTAB)
+      strtab_val = dpnt->d_un.d_val;
+    dpnt++;
+  };
+
+  if (!strtab_val)
+    goto skip;
+
+  dpnt = (ElfW(Dyn) *) &header[dynamic_addr];
+  while (dpnt->d_tag != DT_NULL)
+  {
+    if (dpnt->d_tag == DT_SONAME || dpnt->d_tag == DT_NEEDED)
+    {
+      needed_val = dpnt->d_un.d_val;
+      if (needed_val + strtab_val - loadaddr >= 0 ||
+	  needed_val + strtab_val - loadaddr < st.st_size)
+      {
+	needed = (char *) (header - loadaddr + strtab_val + needed_val);
+
+	if (dpnt->d_tag == DT_SONAME)
+	  soname = xstrdup(needed);
+
+	for (j = 0; needed_tab[j].soname != NULL; j++)
+	{
+	  if (strcmp(needed, needed_tab[j].soname) == 0)
+	  {
+	    if (*type != LIB_ELF && *type != needed_tab[j].type)
+	      multi_libcs = 1;
+	    *type = needed_tab[j].type;
+	  }
+	}
+      }
+    }
+    dpnt++;
+  };
+  
+  if (multi_libcs)
+    warn("%s appears to be for multiple libc's", name);
+
+  /* If we could not deduce the libc type, and we know what to expect, set the type */
+  if(*type == LIB_ELF && expected_type != LIB_ANY) *type = expected_type;
+
+  if(expected_type != LIB_ANY && expected_type != LIB_ELF && 
+     expected_type != *type)
+  {
+      warn("%s does not match type specified for directory!", name);
+  }
+
+ skip:
+  munmap(header, st.st_size);
+
+  return soname;
+}