* I've only tested the code on mpc8xx platforms in big-endian mode.
* Did some cleanup and added BB_USE_xxx_ENTRIES...
*
+ * Quinn Jensen <jensenq@lineo.com> added MIPS support 23-Feb-2001.
+ * based on modutils-2.4.2
+ * MIPS specific support for Elf loading and relocation.
+ * Copyright 1996, 1997 Linux International.
+ * Contributed by Ralf Baechle <ralf@gnu.ai.mit.edu>
+ *
* Based almost entirely on the Linux modutils-2.3.11 implementation.
* Copyright 1996, 1997 Linux International.
* New implementation contributed by Richard Henderson <rth@tamu.edu>
#define BB_GOT_ENTRY_SIZE 4
#endif
+#if defined(__mips__)
+// neither used
+#endif
+
//----------------------------------------------------------------------------
//--------modutils module.h, lines 45-242
//----------------------------------------------------------------------------
#ifndef MODUTILS_MODULE_H
static const int MODUTILS_MODULE_H = 1;
-#ident "$Id: insmod.c,v 1.49 2001/02/20 20:47:08 andersen Exp $"
+#ident "$Id: insmod.c,v 1.53 2001/03/22 19:01:16 andersen Exp $"
/* This file contains the structures used by the 2.0 and 2.1 kernels.
We do not use the kernel headers directly because we do not wish
#ifndef MODUTILS_OBJ_H
static const int MODUTILS_OBJ_H = 1;
-#ident "$Id: insmod.c,v 1.49 2001/02/20 20:47:08 andersen Exp $"
+#ident "$Id: insmod.c,v 1.53 2001/03/22 19:01:16 andersen Exp $"
/* The relocatable object is manipulated using elfin types. */
#define Elf32_RelM Elf32_Rela
#define ELFDATAM ELFDATA2MSB
+#elif defined(__mips__)
+
+/* Account for ELF spec changes. */
+#ifndef EM_MIPS_RS3_LE
+#ifdef EM_MIPS_RS4_BE
+#define EM_MIPS_RS3_LE EM_MIPS_RS4_BE
+#else
+#define EM_MIPS_RS3_LE 10
+#endif
+#endif /* !EM_MIPS_RS3_LE */
+
+#define MATCH_MACHINE(x) (x == EM_MIPS || x == EM_MIPS_RS3_LE)
+#define SHT_RELM SHT_REL
+#define Elf32_RelM Elf32_Rel
+#ifdef __MIPSEB__
+#define ELFDATAM ELFDATA2MSB
+#endif
+#ifdef __MIPSEL__
+#define ELFDATAM ELFDATA2LSB
+#endif
+
#elif defined(__i386__)
/* presumably we can use these for anything but the SH and ARM*/
};
#endif
+#if defined(__mips__)
+struct mips_hi16
+{
+ struct mips_hi16 *next;
+ Elf32_Addr *addr;
+ Elf32_Addr value;
+};
+#endif
+
struct arch_file {
struct obj_file root;
#if defined(BB_USE_PLT_ENTRIES)
#if defined(BB_USE_GOT_ENTRIES)
struct obj_section *got;
#endif
+#if defined(__mips__)
+ struct mips_hi16 *mips_hi16_list;
+#endif
};
struct arch_symbol {
#else
_syscall2(unsigned long, create_module, const char *, name, size_t, size)
#endif
-static char m_filename[BUFSIZ + 1] = "\0";
-static char m_fullName[BUFSIZ + 1] = "\0";
+static char m_filename[BUFSIZ + 1];
+static char m_fullName[BUFSIZ + 1];
/*======================================================================*/
#if defined(BB_USE_GOT_ENTRIES)
f->got = NULL;
#endif
+#if defined(__mips__)
+ f->mips_hi16_list = NULL;
+#endif
return &f->root;
}
ElfW(RelM) *rel, ElfW(Addr) v)
{
struct arch_file *ifile = (struct arch_file *) f;
+#if !(defined(__mips__))
struct arch_symbol *isym = (struct arch_symbol *) sym;
+#endif
ElfW(Addr) *loc = (ElfW(Addr) *) (targsec->contents + rel->r_offset);
ElfW(Addr) dot = targsec->header.sh_addr + rel->r_offset;
case R_386_NONE:
#elif defined(__powerpc__)
case R_PPC_NONE:
+#elif defined(__mips__)
+ case R_MIPS_NONE:
#endif
break;
case R_386_32:
#elif defined(__powerpc__)
case R_PPC_ADDR32:
+#elif defined(__mips__)
+ case R_MIPS_32:
#endif
*loc += v;
break;
break;
#endif
+#if defined(__mips__)
+ case R_MIPS_26:
+ if (v % 4)
+ ret = obj_reloc_dangerous;
+ if ((v & 0xf0000000) != ((dot + 4) & 0xf0000000))
+ ret = obj_reloc_overflow;
+ *loc =
+ (*loc & ~0x03ffffff) | ((*loc + (v >> 2)) &
+ 0x03ffffff);
+ break;
+
+ case R_MIPS_HI16:
+ {
+ struct mips_hi16 *n;
+
+ /* We cannot relocate this one now because we don't know the value
+ of the carry we need to add. Save the information, and let LO16
+ do the actual relocation. */
+ n = (struct mips_hi16 *) xmalloc(sizeof *n);
+ n->addr = loc;
+ n->value = v;
+ n->next = ifile->mips_hi16_list;
+ ifile->mips_hi16_list = n;
+ break;
+ }
+
+ case R_MIPS_LO16:
+ {
+ unsigned long insnlo = *loc;
+ Elf32_Addr val, vallo;
+
+ /* Sign extend the addend we extract from the lo insn. */
+ vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
+
+ if (ifile->mips_hi16_list != NULL) {
+ struct mips_hi16 *l;
+
+ l = ifile->mips_hi16_list;
+ while (l != NULL) {
+ struct mips_hi16 *next;
+ unsigned long insn;
+
+ /* The value for the HI16 had best be the same. */
+ assert(v == l->value);
+
+ /* Do the HI16 relocation. Note that we actually don't
+ need to know anything about the LO16 itself, except where
+ to find the low 16 bits of the addend needed by the LO16. */
+ insn = *l->addr;
+ val =
+ ((insn & 0xffff) << 16) +
+ vallo;
+ val += v;
+
+ /* Account for the sign extension that will happen in the
+ low bits. */
+ val =
+ ((val >> 16) +
+ ((val & 0x8000) !=
+ 0)) & 0xffff;
+
+ insn = (insn & ~0xffff) | val;
+ *l->addr = insn;
+
+ next = l->next;
+ free(l);
+ l = next;
+ }
+
+ ifile->mips_hi16_list = NULL;
+ }
+
+ /* Ok, we're done with the HI16 relocs. Now deal with the LO16. */
+ val = v + vallo;
+ insnlo = (insnlo & ~0xffff) | (val & 0xffff);
+ *loc = insnlo;
+ break;
+ }
+#endif
+
#if defined(__arm__)
#elif defined(__sh__)
case R_SH_REL32:
int arch_create_got(struct obj_file *f)
{
+#if defined(BB_USE_GOT_ENTRIES) || defined(BB_USE_PLT_ENTRIES)
struct arch_file *ifile = (struct arch_file *) f;
int i;
#if defined(BB_USE_GOT_ENTRIES)
ifile->plt = obj_create_alloced_section(f, ".plt",
BB_PLT_ENTRY_SIZE,
plt_offset);
+#endif
#endif
return 1;
}
}
n_ext_modules = nmod = ret;
- ext_modules = modules = xmalloc(nmod * sizeof(*modules));
- memset(modules, 0, nmod * sizeof(*modules));
/* Collect the modules' symbols. */
- for (i = 0, mn = module_names, m = modules;
- i < nmod; ++i, ++m, mn += strlen(mn) + 1) {
- struct new_module_info info;
-
- if (query_module(mn, QM_INFO, &info, sizeof(info), &ret)) {
- if (errno == ENOENT) {
- /* The module was removed out from underneath us. */
- continue;
- }
- perror_msg("query_module: QM_INFO: %s", mn);
- return 0;
- }
-
- syms = xmalloc(bufsize = 1024);
- retry_mod_sym_load:
- if (query_module(mn, QM_SYMBOLS, syms, bufsize, &ret)) {
- switch (errno) {
- case ENOSPC:
- syms = xrealloc(syms, bufsize = ret);
- goto retry_mod_sym_load;
- case ENOENT:
- /* The module was removed out from underneath us. */
- continue;
- default:
- perror_msg("query_module: QM_SYMBOLS: %s", mn);
+ if (nmod){
+ ext_modules = modules = xmalloc(nmod * sizeof(*modules));
+ memset(modules, 0, nmod * sizeof(*modules));
+ for (i = 0, mn = module_names, m = modules;
+ i < nmod; ++i, ++m, mn += strlen(mn) + 1) {
+ struct new_module_info info;
+
+ if (query_module(mn, QM_INFO, &info, sizeof(info), &ret)) {
+ if (errno == ENOENT) {
+ /* The module was removed out from underneath us. */
+ continue;
+ }
+ perror_msg("query_module: QM_INFO: %s", mn);
return 0;
}
- }
- nsyms = ret;
-
- m->name = mn;
- m->addr = info.addr;
- m->nsyms = nsyms;
- m->syms = syms;
-
- for (j = 0, s = syms; j < nsyms; ++j, ++s) {
- s->name += (unsigned long) syms;
+
+ syms = xmalloc(bufsize = 1024);
+ retry_mod_sym_load:
+ if (query_module(mn, QM_SYMBOLS, syms, bufsize, &ret)) {
+ switch (errno) {
+ case ENOSPC:
+ syms = xrealloc(syms, bufsize = ret);
+ goto retry_mod_sym_load;
+ case ENOENT:
+ /* The module was removed out from underneath us. */
+ continue;
+ default:
+ perror_msg("query_module: QM_SYMBOLS: %s", mn);
+ return 0;
+ }
+ }
+ nsyms = ret;
+
+ m->name = mn;
+ m->addr = info.addr;
+ m->nsyms = nsyms;
+ m->syms = syms;
+
+ for (j = 0, s = syms; j < nsyms; ++j, ++s) {
+ s->name += (unsigned long) syms;
+ }
}
}
for (sec = f->load_order; sec; sec = sec->load_next) {
char *secimg;
- if (sec->header.sh_size == 0)
+ if (sec->contents == 0 || sec->header.sh_size == 0)
continue;
secimg = image + (sec->header.sh_addr - base);
sec->header = section_headers[i];
sec->idx = i;
- switch (sec->header.sh_type) {
+ if(sec->header.sh_size) switch (sec->header.sh_type) {
case SHT_NULL:
case SHT_NOTE:
case SHT_NOBITS:
projects / oweals / busybox.git / blobdiff