Another update from Larry:

[oweals/busybox.git] / insmod.c

diff --git a/insmod.c b/insmod.c
index c6642a0527a82c352f998f22a5f153085d61030c..27f4a50e2045123f0aa1ce7da403bea9385a8c42 100644 (file)
--- a/insmod.c
+++ b/insmod.c
@@ -1,6 +1,7 @@
 /* vi: set sw=4 ts=4: */
 /*
  * Mini insmod implementation for busybox
+ * This version of insmod now supports x86, ARM, SH3/4, powerpc, and MIPS.
  *
  * Copyright (C) 1999,2000,2001 by Lineo, inc.
  * Written by Erik Andersen <andersen@lineo.com>
@@ -123,7 +124,7 @@
 #ifndef MODUTILS_MODULE_H
 static const int MODUTILS_MODULE_H = 1;
 
-#ident "$Id: insmod.c,v 1.58 2001/04/24 21:41:41 andersen Exp $"
+#ident "$Id: insmod.c,v 1.60 2001/04/26 19:29:58 andersen Exp $"
 
 /* This file contains the structures used by the 2.0 and 2.1 kernels.
    We do not use the kernel headers directly because we do not wish
@@ -329,7 +330,7 @@ int delete_module(const char *);
 #ifndef MODUTILS_OBJ_H
 static const int MODUTILS_OBJ_H = 1;
 
-#ident "$Id: insmod.c,v 1.58 2001/04/24 21:41:41 andersen Exp $"
+#ident "$Id: insmod.c,v 1.60 2001/04/26 19:29:58 andersen Exp $"
 
 /* The relocatable object is manipulated using elfin types.  */
 
@@ -1535,7 +1536,9 @@ struct obj_section *obj_create_alloced_section_first(struct obj_file *f,
 void *obj_extend_section(struct obj_section *sec, unsigned long more)
 {
        unsigned long oldsize = sec->header.sh_size;
-       sec->contents = xrealloc(sec->contents, sec->header.sh_size += more);
+       if (more) { 
+               sec->contents = xrealloc(sec->contents, sec->header.sh_size += more);
+       }
        return sec->contents + oldsize;
 }
 
@@ -1787,7 +1790,10 @@ static int old_get_kernel_symbols(const char *m_name)
 
        nks = get_kernel_syms(NULL);
        if (nks <= 0) {
-               perror_msg("get_kernel_syms: %s", m_name);
+               if (nks)
+                       perror_msg("get_kernel_syms: %s", m_name);
+               else
+                       error_msg("No kernel symbols");
                return 0;
        }
 
@@ -1807,7 +1813,6 @@ static int old_get_kernel_symbols(const char *m_name)
 
        while (k->name[0] == '#' && k->name[1]) {
                struct old_kernel_sym *k2;
-               struct new_module_symbol *s;
 
                /* Find out how many symbols this module has.  */
                for (k2 = k + 1; k2->name[0] != '#'; ++k2)
@@ -2277,7 +2282,7 @@ static int new_get_kernel_symbols(void)
        module_names = xmalloc(bufsize = 256);
   retry_modules_load:
        if (query_module(NULL, QM_MODULES, module_names, bufsize, &ret)) {
-               if (errno == ENOSPC) {
+               if (errno == ENOSPC && bufsize < ret) {
                        module_names = xrealloc(module_names, bufsize = ret);
                        goto retry_modules_load;
                }
@@ -2338,7 +2343,7 @@ static int new_get_kernel_symbols(void)
        syms = xmalloc(bufsize = 16 * 1024);
   retry_kern_sym_load:
        if (query_module(NULL, QM_SYMBOLS, syms, bufsize, &ret)) {
-               if (errno == ENOSPC) {
+               if (errno == ENOSPC && bufsize < ret) {
                        syms = xrealloc(syms, bufsize = ret);
                        goto retry_kern_sym_load;
                }
@@ -2471,6 +2476,9 @@ new_init_module(const char *m_name, struct obj_file *f,
        tgt_long m_addr;
 
        sec = obj_find_section(f, ".this");
+       if (!sec || !sec->contents) { 
+               perror_msg_and_die("corrupt module %s?",m_name);
+       }
        module = (struct new_module *) sec->contents;
        m_addr = sec->header.sh_addr;
 
@@ -3022,6 +3030,12 @@ struct obj_file *obj_load(FILE * fp)
        for (i = 0; i < shnum; ++i) {
                struct obj_section *sec = f->sections[i];
 
+               /* .modinfo should be contents only but gcc has no attribute for that.
+                * The kernel may have marked .modinfo as ALLOC, ignore this bit.
+                */
+               if (strcmp(sec->name, ".modinfo") == 0)
+                       sec->header.sh_flags &= ~SHF_ALLOC;
+
                if (sec->header.sh_flags & SHF_ALLOC)
                        obj_insert_section_load_order(f, sec);
 
@@ -3045,22 +3059,20 @@ struct obj_file *obj_load(FILE * fp)
 
                                /* 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);
+                               f->local_symtab = xcalloc(j, sizeof(struct obj_symbol *));
 
                                /* 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
+                                       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;
 
                case SHT_RELM:
@@ -3071,6 +3083,10 @@ struct obj_file *obj_load(FILE * fp)
                                return NULL;
                        }
                        break;
+                       /* XXX  Relocation code from modutils-2.3.19 is not here.
+                        * Why?  That's about 20 lines of code from obj/obj_load.c,
+                        * which gets done in a second pass through the sections.
+                        * This BusyBox insmod does similar work in obj_relocate(). */
                }
        }