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authorGravatar Eric Andersen <andersen@codepoet.org>2001-05-21 16:09:18 +0000
committerGravatar Eric Andersen <andersen@codepoet.org>2001-05-21 16:09:18 +0000
commit8ae319a32228dff15f4b9696deb5883fb242f024 (patch)
treebd1306d5a4a1f218d8c244ad5000248c5f518b90 /modutils
parent2f6e1f880b630751fa20cb29bafc06aa0f3d0fcb (diff)
downloadbusybox-8ae319a32228dff15f4b9696deb5883fb242f024.tar.gz
busybox-8ae319a32228dff15f4b9696deb5883fb242f024.tar.bz2
This patch from Bernhard Kuhn <kuhn@lpr.e-technik.tu-muenchen.de> is based on
the work of Jinux Kim on his "babobox" (derived from busybox-0.42), and enables kernel module loading and unloading for uClinux/m68k.
Diffstat (limited to 'modutils')
-rw-r--r--modutils/insmod.c159
1 files changed, 152 insertions, 7 deletions
diff --git a/modutils/insmod.c b/modutils/insmod.c
index 0644affd1..5e51fcb70 100644
--- a/modutils/insmod.c
+++ b/modutils/insmod.c
@@ -69,6 +69,12 @@
# define old_sys_init_module init_module
#endif
+#ifdef BB_FEATURE_INSMOD_LOADINKMEM
+#define LOADBITS 0
+#else
+#define LOADBITS 1
+#endif
+
#if defined(__powerpc__)
#define BB_USE_PLT_ENTRIES
#define BB_PLT_ENTRY_SIZE 16
@@ -124,7 +130,7 @@
#ifndef MODUTILS_MODULE_H
static const int MODUTILS_MODULE_H = 1;
-#ident "$Id: insmod.c,v 1.63 2001/05/14 20:03:04 andersen Exp $"
+#ident "$Id: insmod.c,v 1.64 2001/05/21 16:09:18 andersen Exp $"
/* This file contains the structures used by the 2.0 and 2.1 kernels.
We do not use the kernel headers directly because we do not wish
@@ -257,8 +263,19 @@ struct new_module
unsigned tgt_long persist_end;
unsigned tgt_long can_unload;
unsigned tgt_long runsize;
+#ifdef BB_FEATURE_NEW_MODULE_INTERFACE
+ const char *kallsyms_start; /* All symbols for kernel debugging */
+ const char *kallsyms_end;
+ const char *archdata_start; /* arch specific data for module */
+ const char *archdata_end;
+ const char *kernel_data; /* Reserved for kernel internal use */
+#endif
};
+#define ARCHDATA_SEC_NAME "__archdata"
+#define KALLSYMS_SEC_NAME "__kallsyms"
+
+
struct new_module_info
{
unsigned long addr;
@@ -330,7 +347,7 @@ int delete_module(const char *);
#ifndef MODUTILS_OBJ_H
static const int MODUTILS_OBJ_H = 1;
-#ident "$Id: insmod.c,v 1.63 2001/05/14 20:03:04 andersen Exp $"
+#ident "$Id: insmod.c,v 1.64 2001/05/21 16:09:18 andersen Exp $"
/* The relocatable object is manipulated using elfin types. */
@@ -355,6 +372,14 @@ static const int MODUTILS_OBJ_H = 1;
#define ELFCLASSM ELFCLASS32
+#if (defined(__m68k__))
+#define ELFDATAM ELFDATA2MSB
+#else
+#define ELFDATAM ELFDATA2LSB
+#endif
+
+
+
#if defined(__sh__)
#define MATCH_MACHINE(x) (x == EM_SH)
@@ -412,6 +437,12 @@ static const int MODUTILS_OBJ_H = 1;
#define Elf32_RelM Elf32_Rel
#define ELFDATAM ELFDATA2LSB
+#elif defined(__m68k__)
+
+#define MATCH_MACHINE(x) (x == EM_68K)
+#define SHT_RELM SHT_RELA
+#define Elf32_RelM Elf32_Rela
+
#else
#error Sorry, but insmod.c does not yet support this architecture...
#endif
@@ -558,7 +589,7 @@ unsigned long obj_load_size (struct obj_file *f);
int obj_relocate (struct obj_file *f, ElfW(Addr) base);
-struct obj_file *obj_load(FILE *f);
+struct obj_file *obj_load(FILE *f, int loadprogbits);
int obj_create_image (struct obj_file *f, char *image);
@@ -784,6 +815,8 @@ arch_apply_relocation(struct obj_file *f,
case R_ARM_NONE:
#elif defined(__i386__)
case R_386_NONE:
+#elif defined(__m68k__)
+ case R_68K_NONE:
#elif defined(__powerpc__)
case R_PPC_NONE:
#elif defined(__mips__)
@@ -797,6 +830,8 @@ arch_apply_relocation(struct obj_file *f,
case R_ARM_ABS32:
#elif defined(__i386__)
case R_386_32:
+#elif defined(__m68k__)
+ case R_68K_32:
#elif defined(__powerpc__)
case R_PPC_ADDR32:
#elif defined(__mips__)
@@ -804,6 +839,18 @@ arch_apply_relocation(struct obj_file *f,
#endif
*loc += v;
break;
+#if defined(__m68k__)
+ case R_68K_8:
+ if (v > 0xff)
+ ret = obj_reloc_overflow;
+ *(char *)loc = v;
+ break;
+ case R_68K_16:
+ if (v > 0xffff)
+ ret = obj_reloc_overflow;
+ *(short *)loc = v;
+ break;
+#endif /* __m68k__ */
#if defined(__powerpc__)
case R_PPC_ADDR16_HA:
@@ -909,6 +956,22 @@ arch_apply_relocation(struct obj_file *f,
case R_386_PC32:
*loc += v - dot;
break;
+#elif defined(__m68k__)
+ case R_68K_PC8:
+ v -= dot;
+ if ((Elf32_Sword)v > 0x7f || (Elf32_Sword)v < -(Elf32_Sword)0x80)
+ ret = obj_reloc_overflow;
+ *(char *)loc = v;
+ break;
+ case R_68K_PC16:
+ v -= dot;
+ if ((Elf32_Sword)v > 0x7fff || (Elf32_Sword)v < -(Elf32_Sword)0x8000)
+ ret = obj_reloc_overflow;
+ *(short *)loc = v;
+ break;
+ case R_68K_PC32:
+ *(int *)loc = v - dot;
+ break;
#elif defined(__powerpc__)
case R_PPC_REL32:
*loc = v - dot;
@@ -988,6 +1051,11 @@ arch_apply_relocation(struct obj_file *f,
case R_386_JMP_SLOT:
*loc = v;
break;
+#elif defined(__m68k__)
+ case R_68K_GLOB_DAT:
+ case R_68K_JMP_SLOT:
+ *loc = v;
+ break;
#endif
#if defined(__arm__)
@@ -999,10 +1067,15 @@ arch_apply_relocation(struct obj_file *f,
case R_386_RELATIVE:
*loc += f->baseaddr;
break;
+#elif defined(__m68k__)
+ case R_68K_RELATIVE:
+ *(int *)loc += f->baseaddr;
+ break;
#endif
#if defined(BB_USE_GOT_ENTRIES)
+#if !defined(__68k__)
#if defined(__sh__)
case R_SH_GOTPC:
#elif defined(__arm__)
@@ -1013,10 +1086,11 @@ arch_apply_relocation(struct obj_file *f,
assert(got != 0);
#if defined(__sh__)
*loc += got - dot + rel->r_addend;;
-#elif defined(__i386__) || defined(__arm__)
+#elif defined(__i386__) || defined(__arm__) || defined(__m68k_)
*loc += got - dot;
#endif
break;
+#endif // __68k__
#if defined(__sh__)
case R_SH_GOT32:
@@ -1024,6 +1098,8 @@ arch_apply_relocation(struct obj_file *f,
case R_ARM_GOT32:
#elif defined(__i386__)
case R_386_GOT32:
+#elif defined(__m68k__)
+ case R_68K_GOT32:
#endif
assert(isym != NULL);
/* needs an entry in the .got: set it, once */
@@ -1034,22 +1110,26 @@ arch_apply_relocation(struct obj_file *f,
/* make the reloc with_respect_to_.got */
#if defined(__sh__)
*loc += isym->gotent.offset + rel->r_addend;
-#elif defined(__i386__) || defined(__arm__)
+#elif defined(__i386__) || defined(__arm__) || defined(__m68k__)
*loc += isym->gotent.offset;
#endif
break;
/* address relative to the got */
+#if !defined(__m68k__)
#if defined(__sh__)
case R_SH_GOTOFF:
#elif defined(__arm__)
case R_ARM_GOTOFF:
#elif defined(__i386__)
case R_386_GOTOFF:
+#elif defined(__m68k__)
+ case R_68K_GOTOFF:
#endif
assert(got != 0);
*loc += v - got;
break;
+#endif // __m68k__
#endif /* BB_USE_GOT_ENTRIES */
@@ -1105,6 +1185,9 @@ int arch_create_got(struct obj_file *f)
#elif defined(__i386__)
case R_386_GOT32:
break;
+#elif defined(__m68k__)
+ case R_68K_GOT32:
+ break;
#endif
#if defined(__powerpc__)
@@ -2504,6 +2587,16 @@ new_init_module(const char *m_name, struct obj_file *f,
module->runsize > sec->header.sh_addr - m_addr)
module->runsize = sec->header.sh_addr - m_addr;
}
+ sec = obj_find_section(f, ARCHDATA_SEC_NAME);
+ if (sec && sec->header.sh_size) {
+ module->archdata_start = (void*)sec->header.sh_addr;
+ module->archdata_end = module->archdata_start + sec->header.sh_size;
+ }
+ sec = obj_find_section(f, KALLSYMS_SEC_NAME);
+ if (sec && sec->header.sh_size) {
+ module->kallsyms_start = (void*)sec->header.sh_addr;
+ module->kallsyms_end = module->kallsyms_start + sec->header.sh_size;
+ }
if (!arch_init_module(f, module))
return 0;
@@ -2884,7 +2977,7 @@ int obj_create_image(struct obj_file *f, char *image)
/*======================================================================*/
-struct obj_file *obj_load(FILE * fp)
+struct obj_file *obj_load(FILE * fp, int loadprogbits)
{
struct obj_file *f;
ElfW(Shdr) * section_headers;
@@ -2963,6 +3056,12 @@ struct obj_file *obj_load(FILE * fp)
break;
case SHT_PROGBITS:
+#if LOADBITS
+ if (!loadprogbits) {
+ sec->contents = NULL;
+ break;
+ }
+#endif
case SHT_SYMTAB:
case SHT_STRTAB:
case SHT_RELM:
@@ -3078,6 +3177,39 @@ struct obj_file *obj_load(FILE * fp)
return f;
}
+#ifdef BB_FEATURE_INSMOD_LOADINKMEM
+/*
+ * load the unloaded sections directly into the memory allocated by
+ * kernel for the module
+ */
+
+int obj_load_progbits(FILE * fp, struct obj_file* f)
+{
+ char* imagebase = (char*) f->imagebase;
+ ElfW(Addr) base = f->baseaddr;
+ struct obj_section* sec;
+
+ for (sec = f->load_order; sec; sec = sec->load_next) {
+
+ /* section already loaded? */
+ if (sec->contents != NULL)
+ continue;
+
+ if (sec->header.sh_size == 0)
+ continue;
+
+ sec->contents = imagebase + (sec->header.sh_addr - base);
+ fseek(fp, sec->header.sh_offset, SEEK_SET);
+ if (fread(sec->contents, sec->header.sh_size, 1, fp) != 1) {
+ errorMsg("error reading ELF section data: %s\n", strerror(errno));
+ return 0;
+ }
+
+ }
+ return 1;
+}
+#endif
+
static void hide_special_symbols(struct obj_file *f)
{
static const char *const specials[] = {
@@ -3219,7 +3351,7 @@ extern int insmod_main( int argc, char **argv)
printf("Using %s\n", m_filename);
- if ((f = obj_load(fp)) == NULL)
+ if ((f = obj_load(fp, LOADBITS)) == NULL)
perror_msg_and_die("Could not load the module");
if (get_modinfo_value(f, "kernel_version") == NULL)
@@ -3344,6 +3476,19 @@ extern int insmod_main( int argc, char **argv)
goto out;
}
+#if !LOADBITS
+ /*
+ * the PROGBITS section was not loaded by the obj_load
+ * now we can load them directly into the kernel memory
+ */
+ // f->imagebase = (char*) m_addr;
+ f->imagebase = (ElfW(Addr)) m_addr;
+ if (!obj_load_progbits(fp, f)) {
+ delete_module(m_name);
+ goto out;
+ }
+#endif
+
if (!obj_relocate(f, m_addr)) {
delete_module(m_name);
goto out;