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-rw-r--r--insmod.c301
1 files changed, 206 insertions, 95 deletions
diff --git a/insmod.c b/insmod.c
index 6386b9407..0963225fa 100644
--- a/insmod.c
+++ b/insmod.c
@@ -7,11 +7,12 @@
* and Ron Alder <alder@lineo.com>
*
* Modified by Bryan Rittmeyer <bryan@ixiacom.com> to support SH4
- * and (theoretically) SH3. Note that there is still no true
- * multiple architecture support. You just get SH3|SH4|i386, despite
- * the mention of ARM and m68k--which may or may not work (but
- * almost certainly do not, due to at least MATCH_MACHINE). I have
- * only tested SH4 in little endian mode.
+ * and (theoretically) SH3. I have only tested SH4 in little endian mode.
+ *
+ * Modified by Alcove, Julien Gaulmin <julien.gaulmin@alcove.fr> and
+ * Nicolas Ferre <nicolas.ferre@alcove.fr> to support ARM7TDMI. Only
+ * very minor changes required to also work with StrongArm and presumably
+ * all ARM based systems.
*
* Based almost entirely on the Linux modutils-2.3.11 implementation.
* Copyright 1996, 1997 Linux International.
@@ -77,7 +78,7 @@
#ifndef MODUTILS_MODULE_H
#define MODUTILS_MODULE_H 1
-#ident "$Id: insmod.c,v 1.29 2000/12/01 02:55:13 kraai Exp $"
+#ident "$Id: insmod.c,v 1.30 2000/12/06 18:18:26 andersen Exp $"
/* This file contains the structures used by the 2.0 and 2.1 kernels.
We do not use the kernel headers directly because we do not wish
@@ -283,7 +284,7 @@ int delete_module(const char *);
#ifndef MODUTILS_OBJ_H
#define MODUTILS_OBJ_H 1
-#ident "$Id: insmod.c,v 1.29 2000/12/01 02:55:13 kraai Exp $"
+#ident "$Id: insmod.c,v 1.30 2000/12/06 18:18:26 andersen Exp $"
/* The relocatable object is manipulated using elfin types. */
@@ -317,12 +318,17 @@ int delete_module(const char *);
#define SHT_RELM SHT_RELA
#define Elf32_RelM Elf32_Rela
-#else
+#elif defined(__arm__)
-/* presumably we can use these for anything but the SH */
+#define MATCH_MACHINE(x) (x == EM_ARM)
+#define SHT_RELM SHT_REL
+#define Elf32_RelM Elf32_Rel
+
+#elif defined(__i386__)
+
+/* presumably we can use these for anything but the SH and ARM*/
/* this is the previous behavior, but it does result in
insmod.c being broken on anything except i386 */
-
#ifndef EM_486
#define MATCH_MACHINE(x) (x == EM_386)
#else
@@ -332,6 +338,8 @@ int delete_module(const char *);
#define SHT_RELM SHT_REL
#define Elf32_RelM Elf32_Rel
+#else
+#error insmod.c no platform specified
#endif
#ifndef ElfW
@@ -531,6 +539,17 @@ int flag_export = 1;
and we can't support anything else right now anyway. In the
future maybe they should be #if defined'd */
+/* Done ;-) */
+
+#if defined(__arm__)
+struct arm_plt_entry
+{
+ int offset;
+ int allocated:1;
+ int inited:1; /* has been set up */
+};
+#endif
+
struct arch_got_entry {
int offset;
unsigned offset_done:1;
@@ -539,11 +558,17 @@ struct arch_got_entry {
struct arch_file {
struct obj_file root;
+#if defined(__arm__)
+ struct obj_section *plt;
+#endif
struct obj_section *got;
};
struct arch_symbol {
struct obj_symbol root;
+#if defined(__arm__)
+ struct arm_plt_entry pltent;
+#endif
struct arch_got_entry gotent;
};
@@ -590,6 +615,10 @@ extern int delete_module(const char *);
-- Bryan Rittmeyer <bryan@ixiacom.com> */
+#ifdef BB_FEATURE_INSMOD_OLD_KERNEL
+_syscall1(int, get_kernel_syms, struct old_kernel_sym *, ks)
+#endif
+
#if defined(__i386__) || defined(__m68k__) || defined(__arm__)
/* Jump through hoops to fixup error return codes */
#define __NR__create_module __NR_create_module
@@ -623,7 +652,7 @@ static int findNamedModule(const char *fileName, struct stat *statbuf,
if (fullName[0] == '\0')
return (FALSE);
else {
- char *tmp = strrchr(fileName, '/');
+ char *tmp = strrchr((char *) fileName, '/');
if (tmp == NULL)
tmp = (char *) fileName;
@@ -667,18 +696,20 @@ arch_apply_relocation(struct obj_file *f,
struct obj_section *targsec,
struct obj_section *symsec,
struct obj_symbol *sym,
-#if defined(__sh__)
- Elf32_Rela * rel, Elf32_Addr v)
-#else
- Elf32_Rel * rel, Elf32_Addr v)
-#endif
+ ElfW(RelM) *rel, ElfW(Addr) v)
{
struct arch_file *ifile = (struct arch_file *) f;
struct arch_symbol *isym = (struct arch_symbol *) sym;
- Elf32_Addr *loc = (Elf32_Addr *) (targsec->contents + rel->r_offset);
- Elf32_Addr dot = targsec->header.sh_addr + rel->r_offset;
- Elf32_Addr got = ifile->got ? ifile->got->header.sh_addr : 0;
+ ElfW(Addr) *loc = (ElfW(Addr) *) (targsec->contents + rel->r_offset);
+ ElfW(Addr) dot = targsec->header.sh_addr + rel->r_offset;
+ ElfW(Addr) got = ifile->got ? ifile->got->header.sh_addr : 0;
+#if defined(__arm__)
+ ElfW(Addr) plt = ifile->plt ? ifile->plt->header.sh_addr : 0;
+
+ struct arm_plt_entry *pe;
+ unsigned long *ip;
+#endif
enum obj_reloc ret = obj_reloc_ok;
@@ -689,52 +720,91 @@ arch_apply_relocation(struct obj_file *f,
and in case that ever changes */
#if defined(__sh__)
case R_SH_NONE:
-#else
+#elif defined(__arm__)
+ case R_ARM_NONE:
+#elif defined(__i386__)
case R_386_NONE:
#endif
break;
#if defined(__sh__)
case R_SH_DIR32:
-#else
+#elif defined(__arm__)
+ case R_ARM_ABS32:
+#elif defined(__i386__)
case R_386_32:
#endif
*loc += v;
break;
-#if defined(__sh__)
+#if defined(__arm__)
+#elif defined(__sh__)
case R_SH_REL32:
-#else
+ *loc += v - dot;
+ break;
+#elif defined(__i386__)
case R_386_PLT32:
case R_386_PC32:
-#endif
*loc += v - dot;
break;
+#endif
#if defined(__sh__)
case R_SH_PLT32:
*loc = v - dot;
break;
+#elif defined(__arm__)
+ case R_ARM_PC24:
+ case R_ARM_PLT32:
+ /* find the plt entry and initialize it if necessary */
+ assert(isym != NULL);
+ pe = (struct arm_plt_entry*) &isym->pltent;
+ if (! pe->inited) {
+ ip = (unsigned long *) (ifile->plt->contents + pe->offset);
+ ip[0] = 0xe51ff004; /* ldr pc,[pc,#-4] */
+ ip[1] = v; /* sym@ */
+ pe->inited = 1;
+ }
+
+ /* relative distance to target */
+ v -= dot;
+ /* if the target is too far away.... */
+ if ((int)v < -0x02000000 || (int)v >= 0x02000000) {
+ /* go via the plt */
+ v = plt + pe->offset - dot;
+ }
+ if (v & 3)
+ ret = obj_reloc_dangerous;
+
+ /* Convert to words. */
+ v >>= 2;
+
+ /* merge the offset into the instruction. */
+ *loc = (*loc & ~0x00ffffff) | ((v + *loc) & 0x00ffffff);
+ break;
+#elif defined(__i386__)
#endif
-#if defined(__sh__)
+#if defined(__arm__)
+#elif defined(__sh__)
case R_SH_GLOB_DAT:
case R_SH_JMP_SLOT:
*loc = v;
break;
-#else
+#elif defined(__i386__)
case R_386_GLOB_DAT:
case R_386_JMP_SLOT:
*loc = v;
break;
#endif
-#if defined(__sh__)
+#if defined(__arm__)
+#elif defined(__sh__)
case R_SH_RELATIVE:
*loc += f->baseaddr + rel->r_addend;
break;
-#else
+#elif defined(__i386__)
case R_386_RELATIVE:
*loc += f->baseaddr;
break;
@@ -742,41 +812,46 @@ arch_apply_relocation(struct obj_file *f,
#if defined(__sh__)
case R_SH_GOTPC:
- assert(got != 0);
- *loc += got - dot + rel->r_addend;;
- break;
-#else
+#elif defined(__arm__)
+ case R_ARM_GOTPC:
+#elif defined(__i386__)
case R_386_GOTPC:
+#endif
assert(got != 0);
+#if defined(__sh__)
+ *loc += got - dot + rel->r_addend;;
+#elif defined(__i386__) || defined(__arm__)
*loc += got - dot;
- break;
#endif
+ break;
#if defined(__sh__)
case R_SH_GOT32:
- assert(isym != NULL);
- if (!isym->gotent.reloc_done) {
- isym->gotent.reloc_done = 1;
- *(Elf32_Addr *) (ifile->got->contents + isym->gotent.offset) =
- v;
- }
- *loc += isym->gotent.offset + rel->r_addend;
- break;
-#else
+#elif defined(__arm__)
+ case R_ARM_GOT32:
+#elif defined(__i386__)
case R_386_GOT32:
+#endif
assert(isym != NULL);
+ /* needs an entry in the .got: set it, once */
if (!isym->gotent.reloc_done) {
isym->gotent.reloc_done = 1;
- *(Elf32_Addr *) (ifile->got->contents + isym->gotent.offset) =
- v;
+ *(ElfW(Addr) *) (ifile->got->contents + isym->gotent.offset) = v;
}
+ /* make the reloc with_respect_to_.got */
+#if defined(__sh__)
+ *loc += isym->gotent.offset + rel->r_addend;
+#elif defined(__i386__) || defined(__arm__)
*loc += isym->gotent.offset;
- break;
#endif
+ break;
+ /* address relative to the got */
#if defined(__sh__)
case R_SH_GOTOFF:
-#else
+#elif defined(__arm__)
+ case R_ARM_GOTOFF:
+#elif defined(__i386__)
case R_386_GOTOFF:
#endif
assert(got != 0);
@@ -784,6 +859,7 @@ arch_apply_relocation(struct obj_file *f,
break;
default:
+ printf("Warning: unhandled reloc %d\n",ELF32_R_TYPE(rel->r_info));
ret = obj_reloc_unhandled;
break;
}
@@ -794,81 +870,111 @@ arch_apply_relocation(struct obj_file *f,
int arch_create_got(struct obj_file *f)
{
struct arch_file *ifile = (struct arch_file *) f;
- int i, n, offset = 0, gotneeded = 0;
-
- n = ifile->root.header.e_shnum;
- for (i = 0; i < n; ++i) {
- struct obj_section *relsec, *symsec, *strsec;
-#if defined(__sh__)
- Elf32_Rela *rel, *relend;
-#else
- Elf32_Rel *rel, *relend;
+ int i, got_offset = 0, gotneeded = 0;
+#if defined(__arm__)
+ int plt_offset = 0, pltneeded = 0;
#endif
- Elf32_Sym *symtab;
- const char *strtab;
+ struct obj_section *relsec, *symsec, *strsec;
+ ElfW(RelM) *rel, *relend;
+ ElfW(Sym) *symtab, *extsym;
+ const char *strtab, *name;
+ struct arch_symbol *intsym;
- relsec = ifile->root.sections[i];
- if (relsec->header.sh_type != SHT_REL)
+ for (i = 0; i < f->header.e_shnum; ++i) {
+ relsec = f->sections[i];
+ if (relsec->header.sh_type != SHT_RELM)
continue;
- symsec = ifile->root.sections[relsec->header.sh_link];
- strsec = ifile->root.sections[symsec->header.sh_link];
-
+ symsec = f->sections[relsec->header.sh_link];
+ strsec = f->sections[symsec->header.sh_link];
-#if defined(__sh__)
- rel = (Elf32_Rela *) relsec->contents;
- relend = rel + (relsec->header.sh_size / sizeof(Elf32_Rela));
-#else
- rel = (Elf32_Rel *) relsec->contents;
- relend = rel + (relsec->header.sh_size / sizeof(Elf32_Rel));
-#endif
- symtab = (Elf32_Sym *) symsec->contents;
+ rel = (ElfW(RelM) *) relsec->contents;
+ relend = rel + (relsec->header.sh_size / sizeof(ElfW(RelM)));
+ symtab = (ElfW(Sym) *) symsec->contents;
strtab = (const char *) strsec->contents;
for (; rel < relend; ++rel) {
- Elf32_Sym *extsym;
- struct arch_symbol *intsym;
- const char *name;
+ extsym = &symtab[ELF32_R_SYM(rel->r_info)];
switch (ELF32_R_TYPE(rel->r_info)) {
-#if defined(__sh__)
+#if defined(__arm__)
+ case R_ARM_GOT32:
+#elif defined(__sh__)
+ case R_SH_GOT32:
+#elif defined(__i386__)
+ case R_386_GOT32:
+#endif
+ break;
+
+#if defined(__arm__)
+ case R_ARM_PC24:
+ case R_ARM_PLT32:
+ pltneeded = 1;
+ break;
+
+ case R_ARM_GOTPC:
+ case R_ARM_GOTOFF:
+ gotneeded = 1;
+ if (got_offset == 0)
+ got_offset = 4;
+#elif defined(__sh__)
case R_SH_GOTPC:
case R_SH_GOTOFF:
-#else
+ gotneeded = 1;
+#elif defined(__i386__)
case R_386_GOTPC:
case R_386_GOTOFF:
-#endif
gotneeded = 1;
+#endif
+
default:
continue;
-
-#if defined(__sh__)
- case R_SH_GOT32:
-#else
- case R_386_GOT32:
-#endif
- break;
}
- extsym = &symtab[ELF32_R_SYM(rel->r_info)];
- if (extsym->st_name)
+ if (extsym->st_name != 0) {
name = strtab + extsym->st_name;
- else
+ } else {
name = f->sections[extsym->st_shndx]->name;
- intsym =
- (struct arch_symbol *) obj_find_symbol(&ifile->root, name);
+ }
+ intsym = (struct arch_symbol *) obj_find_symbol(f, name);
if (!intsym->gotent.offset_done) {
intsym->gotent.offset_done = 1;
- intsym->gotent.offset = offset;
- offset += 4;
+ intsym->gotent.offset = got_offset;
+ got_offset += 4;
}
+#if defined(__arm__)
+ if (pltneeded && intsym->pltent.allocated == 0) {
+ intsym->pltent.allocated = 1;
+ intsym->pltent.offset = plt_offset;
+ plt_offset += 8;
+ intsym->pltent.inited = 0;
+ pltneeded = 0;
+ }
+#endif
+ }
+ }
+
+#if defined(__arm__)
+ if (got_offset) {
+ struct obj_section* relsec = obj_find_section(f, ".got");
+
+ if (relsec) {
+ obj_extend_section(relsec, got_offset);
+ } else {
+ relsec = obj_create_alloced_section(f, ".got", 8, got_offset);
+ assert(relsec);
}
+
+ ifile->got = relsec;
}
- if (offset > 0 || gotneeded)
- ifile->got =
- obj_create_alloced_section(&ifile->root, ".got", 4, offset);
+ if (plt_offset)
+ ifile->plt = obj_create_alloced_section(f, ".plt", 8, plt_offset);
+#else
+ if (got_offset > 0 || gotneeded)
+ ifile->got = obj_create_alloced_section(f, ".got", 4, got_offset);
+#endif
return 1;
}
@@ -1598,7 +1704,7 @@ old_init_module(const char *m_name, struct obj_file *f,
ksym->name =
(unsigned long) str - (unsigned long) symtab;
- str = stpcpy(str, sym->name) + 1;
+ str = strcpy(str, sym->name) + 1;
ksym++;
}
}
@@ -2201,8 +2307,9 @@ new_init_module(const char *m_name, struct obj_file *f,
#define new_init_module(x, y, z) TRUE
#define new_create_this_module(x, y) 0
#define new_create_module_ksymtab(x)
+#define query_module(v, w, x, y, z) -1
-#endif /* BB_FEATURE_INSMOD_OLD_KERNEL */
+#endif /* BB_FEATURE_INSMOD_NEW_KERNEL */
/*======================================================================*/
@@ -2372,8 +2479,12 @@ void obj_allocate_commons(struct obj_file *f)
for (i = 0; i < f->header.e_shnum; ++i) {
struct obj_section *s = f->sections[i];
if (s->header.sh_type == SHT_NOBITS) {
+ if (s->header.sh_size != 0)
s->contents = memset(xmalloc(s->header.sh_size),
0, s->header.sh_size);
+ else
+ s->contents = NULL;
+
s->header.sh_type = SHT_PROGBITS;
}
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-12 21:29:10 +0000