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Subject[PATCH] s390 (12/13): kernel module loader.
Date
Add missing/fix existing s390 relocations in the kernel module loader.

diff -urN linux-2.5.62/arch/s390/kernel/module.c linux-2.5.62-s390/arch/s390/kernel/module.c
--- linux-2.5.62/arch/s390/kernel/module.c Mon Feb 17 23:56:54 2003
+++ linux-2.5.62-s390/arch/s390/kernel/module.c Mon Feb 24 18:24:54 2003
@@ -2,7 +2,8 @@
* arch/s390/kernel/module.c - Kernel module help for s390.
*
* S390 version
- * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Copyright (C) 2002, 2003 IBM Deutschland Entwicklung GmbH,
+ * IBM Corporation
* Author(s): Arnd Bergmann (arndb@de.ibm.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*
@@ -36,6 +37,9 @@
#define DEBUGP(fmt , ...)
#endif

+#define GOT_ENTRY_SIZE 4
+#define PLT_ENTRY_SIZE 12
+
void *module_alloc(unsigned long size)
{
if (size == 0)
@@ -51,109 +55,296 @@
table entries. */
}

-int module_frob_arch_sections(Elf_Ehdr *hdr,
- Elf_Shdr *sechdrs,
- char *secstrings,
- struct module *mod)
+static inline void
+check_rela(Elf32_Rela *rela, struct module *me)
{
- // FIXME: add space needed for GOT/PLT
- return 0;
+ struct mod_arch_syminfo *info;
+
+ info = me->arch.syminfo + ELF32_R_SYM (rela->r_info);
+ switch (ELF32_R_TYPE (rela->r_info)) {
+ case R_390_GOT12: /* 12 bit GOT offset. */
+ case R_390_GOT16: /* 16 bit GOT offset. */
+ case R_390_GOT32: /* 32 bit GOT offset. */
+ case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
+ case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
+ case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
+ case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
+ case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
+ if (info->got_offset == -1UL) {
+ info->got_offset = me->arch.got_size;
+ me->arch.got_size += GOT_ENTRY_SIZE;
+ }
+ break;
+ case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
+ case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
+ case R_390_PLT32: /* 32 bit PC relative PLT address. */
+ case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
+ case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
+ if (info->plt_offset == -1UL) {
+ info->plt_offset = me->arch.plt_size;
+ me->arch.plt_size += PLT_ENTRY_SIZE;
+ }
+ break;
+ case R_390_COPY:
+ case R_390_GLOB_DAT:
+ case R_390_JMP_SLOT:
+ case R_390_RELATIVE:
+ /* Only needed if we want to support loading of
+ modules linked with -shared. */
+ break;
+ }
}

-int apply_relocate(Elf_Shdr *sechdrs,
- const char *strtab,
- unsigned int symindex,
- unsigned int relsec,
- struct module *me)
+/*
+ * Account for GOT and PLT relocations. We can't add sections for
+ * got and plt but we can increase the core module size.
+ */
+int
+module_frob_arch_sections(Elf32_Ehdr *hdr, Elf32_Shdr *sechdrs,
+ char *secstrings, struct module *me)
{
- unsigned int i;
- ElfW(Rel) *rel = (void *)sechdrs[relsec].sh_addr;
- ElfW(Sym) *sym;
- ElfW(Addr) *location;
-
- DEBUGP("Applying relocate section %u to %u\n", relsec,
- sechdrs[relsec].sh_info);
- for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
- /* This is where to make the change */
- location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
- + rel[i].r_offset;
- /* This is the symbol it is referring to. Note that all
- undefined symbols have been resolved. */
- sym = (ElfW(Sym) *)sechdrs[symindex].sh_addr
- + ELFW(R_SYM)(rel[i].r_info);
-
- switch (ELF_R_TYPE(rel[i].r_info)) {
- case R_390_8: /* Direct 8 bit. */
- *(u8*) location += sym->st_value;
- break;
- case R_390_12: /* Direct 12 bit. */
- *(u16*) location = (*(u16*) location & 0xf000) |
- (sym->st_value & 0xfff);
- break;
- case R_390_16: /* Direct 16 bit. */
- *(u16*) location += sym->st_value;
- break;
- case R_390_32: /* Direct 32 bit. */
- *(u32*) location += sym->st_value;
- break;
- case R_390_PC16: /* PC relative 16 bit. */
- *(u16*) location += sym->st_value
- - (unsigned long )location;
-
- case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */
- *(u16*) location += (sym->st_value
- - (unsigned long )location) >> 1;
- case R_390_PC32: /* PC relative 32 bit. */
- *(u32*) location += sym->st_value
- - (unsigned long )location;
- break;
- case R_390_GOT12: /* 12 bit GOT offset. */
- case R_390_GOT16: /* 16 bit GOT offset. */
- case R_390_GOT32: /* 32 bit GOT offset. */
- // FIXME: TODO
- break;
-
- case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
- case R_390_PLT32: /* 32 bit PC relative PLT address. */
- // FIXME: TODO
- break;
- case R_390_GLOB_DAT: /* Create GOT entry. */
- case R_390_JMP_SLOT: /* Create PLT entry. */
- *location = sym->st_value;
- break;
- case R_390_RELATIVE: /* Adjust by program base. */
- // FIXME: TODO
- break;
- case R_390_GOTOFF: /* 32 bit offset to GOT. */
- // FIXME: TODO
- break;
- case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */
- // FIXME: TODO
+ Elf32_Shdr *symtab;
+ Elf32_Sym *symbols;
+ Elf32_Rela *rela;
+ char *strings;
+ int nrela, i, j;
+
+ /* Find symbol table and string table. */
+ symtab = 0;
+ for (i = 0; i < hdr->e_shnum; i++)
+ switch (sechdrs[i].sh_type) {
+ case SHT_SYMTAB:
+ symtab = sechdrs + i;
break;
- default:
- printk(KERN_ERR "module %s: Unknown relocation: %lu\n",
- me->name,
- (unsigned long)ELF_R_TYPE(rel[i].r_info));
- return -ENOEXEC;
}
+ if (!symtab) {
+ printk(KERN_ERR "module %s: no symbol table\n", me->name);
+ return -ENOEXEC;
}
+
+ /* Allocate one syminfo structure per symbol. */
+ me->arch.nsyms = symtab->sh_size / sizeof(Elf32_Sym);
+ me->arch.syminfo = kmalloc(me->arch.nsyms *
+ sizeof(struct mod_arch_syminfo),
+ GFP_KERNEL);
+ if (!me->arch.syminfo)
+ return -ENOMEM;
+ symbols = (void *) hdr + symtab->sh_offset;
+ strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset;
+ for (i = 0; i < me->arch.nsyms; i++) {
+ if (symbols[i].st_shndx == SHN_UNDEF &&
+ strcmp(strings + symbols[i].st_name,
+ "_GLOBAL_OFFSET_TABLE_") == 0)
+ /* "Define" it as absolute. */
+ symbols[i].st_shndx = SHN_ABS;
+ me->arch.syminfo[i].got_offset = -1UL;
+ me->arch.syminfo[i].plt_offset = -1UL;
+ me->arch.syminfo[i].got_initialized = 0;
+ me->arch.syminfo[i].plt_initialized = 0;
+ }
+
+ /* Search for got/plt relocations. */
+ me->arch.got_size = me->arch.plt_size = 0;
+ for (i = 0; i < hdr->e_shnum; i++) {
+ if (sechdrs[i].sh_type != SHT_RELA)
+ continue;
+ nrela = sechdrs[i].sh_size / sizeof(Elf32_Rela);
+ rela = (void *) hdr + sechdrs[i].sh_offset;
+ for (j = 0; j < nrela; j++)
+ check_rela(rela + j, me);
+ }
+
+ /* Increase core size by size of got & plt and set start
+ offsets for got and plt. */
+ me->core_size = ALIGN(me->core_size, 4);
+ me->arch.got_offset = me->core_size;
+ me->core_size += me->arch.got_size;
+ me->arch.plt_offset = me->core_size;
+ me->core_size += me->arch.plt_size;
return 0;
}

-int apply_relocate_add(Elf32_Shdr *sechdrs,
- const char *strtab,
- unsigned int symindex,
- unsigned int relsec,
- struct module *me)
+int
+apply_relocate(Elf_Shdr *sechdrs, const char *strtab, unsigned int symindex,
+ unsigned int relsec, struct module *me)
{
- printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
+ printk(KERN_ERR "module %s: RELOCATION unsupported\n",
me->name);
return -ENOEXEC;
}

+static inline int
+apply_rela(Elf32_Rela *rela, Elf32_Addr base, Elf32_Sym *symtab,
+ struct module *me)
+{
+ struct mod_arch_syminfo *info;
+ Elf32_Addr loc, val;
+ int r_type, r_sym;
+
+ /* This is where to make the change */
+ loc = base + rela->r_offset;
+ /* This is the symbol it is referring to. Note that all
+ undefined symbols have been resolved. */
+ r_sym = ELF32_R_SYM(rela->r_info);
+ r_type = ELF32_R_TYPE(rela->r_info);
+ info = me->arch.syminfo + r_sym;
+ val = symtab[r_sym].st_value;
+
+ switch (r_type) {
+ case R_390_8: /* Direct 8 bit. */
+ case R_390_12: /* Direct 12 bit. */
+ case R_390_16: /* Direct 16 bit. */
+ case R_390_32: /* Direct 32 bit. */
+ val += rela->r_addend;
+ if (r_type == R_390_8)
+ *(unsigned char *) loc = val;
+ else if (r_type == R_390_12)
+ *(unsigned short *) loc = (val & 0xfff) |
+ (*(unsigned short *) loc & 0xf000);
+ else if (r_type == R_390_16)
+ *(unsigned short *) loc = val;
+ else if (r_type == R_390_32)
+ *(unsigned int *) loc = val;
+ break;
+ case R_390_PC16: /* PC relative 16 bit. */
+ case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */
+ case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */
+ case R_390_PC32: /* PC relative 32 bit. */
+ val += rela->r_addend - loc;
+ if (r_type == R_390_PC16)
+ *(unsigned short *) loc = val;
+ else if (r_type == R_390_PC16DBL)
+ *(unsigned short *) loc = val >> 1;
+ else if (r_type == R_390_PC32DBL)
+ *(unsigned int *) loc = val >> 1;
+ else if (r_type == R_390_PC32)
+ *(unsigned int *) loc = val;
+ break;
+ case R_390_GOT12: /* 12 bit GOT offset. */
+ case R_390_GOT16: /* 16 bit GOT offset. */
+ case R_390_GOT32: /* 32 bit GOT offset. */
+ case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
+ case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
+ case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
+ case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
+ case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
+ if (info->got_initialized == 0) {
+ Elf32_Addr *gotent;
+ gotent = me->module_core + me->arch.got_offset +
+ info->got_offset;
+ *gotent = val;
+ info->got_initialized = 1;
+ }
+ val = info->got_offset + rela->r_addend;
+ if (r_type == R_390_GOT12 ||
+ r_type == R_390_GOTPLT12)
+ *(unsigned short *) loc = (val & 0xfff) |
+ (*(unsigned short *) loc & 0xf000);
+ else if (r_type == R_390_GOT16 ||
+ r_type == R_390_GOTPLT16)
+ *(unsigned short *) loc = val;
+ else if (r_type == R_390_GOT32 ||
+ r_type == R_390_GOTPLT32)
+ *(unsigned int *) loc = val;
+ else if (r_type == R_390_GOTENT ||
+ r_type == R_390_GOTPLTENT)
+ *(unsigned int *) loc = val >> 1;
+ break;
+ case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
+ case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
+ case R_390_PLT32: /* 32 bit PC relative PLT address. */
+ case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
+ case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
+ if (info->plt_initialized == 0) {
+ unsigned int *ip;
+ ip = me->module_core + me->arch.plt_offset +
+ info->plt_offset;
+ ip[0] = 0x0d105810; /* basr 1,0; l 1,6(1); br 1 */
+ ip[1] = 0x100607f1;
+ ip[2] = val;
+ info->plt_initialized = 1;
+ }
+ if (r_type == R_390_PLTOFF16 ||
+ r_type == R_390_PLTOFF32)
+ val = me->arch.plt_offset - me->arch.got_offset +
+ info->plt_offset + rela->r_addend;
+ else
+ val = (Elf32_Addr) me->module_core +
+ me->arch.plt_offset + info->plt_offset +
+ rela->r_addend - loc;
+ if (r_type == R_390_PLT16DBL)
+ *(unsigned short *) loc = val >> 1;
+ else if (r_type == R_390_PLTOFF16)
+ *(unsigned short *) loc = val;
+ else if (r_type == R_390_PLT32DBL)
+ *(unsigned int *) loc = val >> 1;
+ else if (r_type == R_390_PLT32 ||
+ r_type == R_390_PLTOFF32)
+ *(unsigned int *) loc = val;
+ break;
+ case R_390_GOTOFF16: /* 16 bit offset to GOT. */
+ case R_390_GOTOFF32: /* 32 bit offset to GOT. */
+ val = val + rela->r_addend -
+ ((Elf32_Addr) me->module_core + me->arch.got_offset);
+ if (r_type == R_390_GOTOFF16)
+ *(unsigned short *) loc = val;
+ else if (r_type == R_390_GOTOFF32)
+ *(unsigned int *) loc = val;
+ break;
+ case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */
+ case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */
+ val = (Elf32_Addr) me->module_core + me->arch.got_offset +
+ rela->r_addend - loc;
+ if (r_type == R_390_GOTPC)
+ *(unsigned int *) loc = val;
+ else if (r_type == R_390_GOTPCDBL)
+ *(unsigned int *) loc = val >> 1;
+ break;
+ case R_390_COPY:
+ case R_390_GLOB_DAT: /* Create GOT entry. */
+ case R_390_JMP_SLOT: /* Create PLT entry. */
+ case R_390_RELATIVE: /* Adjust by program base. */
+ /* Only needed if we want to support loading of
+ modules linked with -shared. */
+ break;
+ default:
+ printk(KERN_ERR "module %s: Unknown relocation: %u\n",
+ me->name, r_type);
+ return -ENOEXEC;
+ }
+ return 0;
+}
+
+int
+apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
+ unsigned int symindex, unsigned int relsec,
+ struct module *me)
+{
+ Elf32_Addr base;
+ Elf32_Sym *symtab;
+ Elf32_Rela *rela;
+ unsigned long i, n;
+ int rc;
+
+ DEBUGP("Applying relocate section %u to %u\n",
+ relsec, sechdrs[relsec].sh_info);
+ base = sechdrs[sechdrs[relsec].sh_info].sh_addr;
+ symtab = (Elf32_Sym *) sechdrs[symindex].sh_addr;
+ rela = (Elf32_Rela *) sechdrs[relsec].sh_addr;
+ n = sechdrs[relsec].sh_size / sizeof(Elf32_Rela);
+ for (i = 0; i < n; i++, rela++) {
+ rc = apply_rela(rela, base, symtab, me);
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
+
int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *me)
{
+ if (me->arch.syminfo)
+ kfree(me->arch.syminfo);
return 0;
}
diff -urN linux-2.5.62/arch/s390x/kernel/module.c linux-2.5.62-s390/arch/s390x/kernel/module.c
--- linux-2.5.62/arch/s390x/kernel/module.c Mon Feb 17 23:57:21 2003
+++ linux-2.5.62-s390/arch/s390x/kernel/module.c Mon Feb 24 18:24:54 2003
@@ -2,7 +2,8 @@
* arch/s390x/kernel/module.c - Kernel module help for s390x.
*
* S390 version
- * Copyright (C) 2002 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Copyright (C) 2002, 2003 IBM Deutschland Entwicklung GmbH,
+ * IBM Corporation
* Author(s): Arnd Bergmann (arndb@de.ibm.com)
* Martin Schwidefsky (schwidefsky@de.ibm.com)
*
@@ -36,6 +37,9 @@
#define DEBUGP(fmt , ...)
#endif

+#define GOT_ENTRY_SIZE 8
+#define PLT_ENTRY_SIZE 20
+
void *module_alloc(unsigned long size)
{
if (size == 0)
@@ -51,126 +55,322 @@
table entries. */
}

-/* s390/s390x needs additional memory for GOT/PLT sections. */
-int module_frob_arch_sections(Elf_Ehdr *hdr,
- Elf_Shdr *sechdrs,
- char *secstrings,
- struct module *mod)
+static inline void
+check_rela(Elf64_Rela *rela, struct module *me)
{
- // FIXME: add space needed for GOT/PLT
- return 0;
+ struct mod_arch_syminfo *info;
+
+ info = me->arch.syminfo + ELF64_R_SYM (rela->r_info);
+ switch (ELF64_R_TYPE (rela->r_info)) {
+ case R_390_GOT12: /* 12 bit GOT offset. */
+ case R_390_GOT16: /* 16 bit GOT offset. */
+ case R_390_GOT32: /* 32 bit GOT offset. */
+ case R_390_GOT64: /* 64 bit GOT offset. */
+ case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
+ case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
+ case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
+ case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
+ case R_390_GOTPLT64: /* 64 bit offset to jump slot. */
+ case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
+ if (info->got_offset == -1UL) {
+ info->got_offset = me->arch.got_size;
+ me->arch.got_size += GOT_ENTRY_SIZE;
+ }
+ break;
+ case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
+ case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
+ case R_390_PLT32: /* 32 bit PC relative PLT address. */
+ case R_390_PLT64: /* 64 bit PC relative PLT address. */
+ case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
+ case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
+ case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */
+ if (info->plt_offset == -1UL) {
+ info->plt_offset = me->arch.plt_size;
+ me->arch.plt_size += PLT_ENTRY_SIZE;
+ }
+ break;
+ case R_390_COPY:
+ case R_390_GLOB_DAT:
+ case R_390_JMP_SLOT:
+ case R_390_RELATIVE:
+ /* Only needed if we want to support loading of
+ modules linked with -shared. */
+ break;
+ }
}

-int apply_relocate(Elf_Shdr *sechdrs,
- const char *strtab,
- unsigned int symindex,
- unsigned int relsec,
- struct module *me)
+/*
+ * Account for GOT and PLT relocations. We can't add sections for
+ * got and plt but we can increase the core module size.
+ */
+int
+module_frob_arch_sections(Elf64_Ehdr *hdr, Elf64_Shdr *sechdrs,
+ char *secstrings, struct module *me)
{
- unsigned int i;
- ElfW(Rel) *rel = (void *)sechdrs[relsec].sh_addr;
- ElfW(Sym) *sym;
- ElfW(Addr) *location;
-
- DEBUGP("Applying relocate section %u to %u\n", relsec,
- sechdrs[relsec].sh_info);
- for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
- /* This is where to make the change */
- location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
- + rel[i].r_offset;
- /* This is the symbol it is referring to. Note that all
- undefined symbols have been resolved. */
- sym = (ElfW(Sym) *)sechdrs[symindex].sh_addr
- + ELFW(R_SYM)(rel[i].r_info);
-
- switch (ELF_R_TYPE(rel[i].r_info)) {
- case R_390_8: /* Direct 8 bit. */
- *(u8*) location += sym->st_value;
- break;
- case R_390_12: /* Direct 12 bit. */
- *(u16*) location = (*(u16*) location & 0xf000) |
- (sym->st_value & 0xfff);
- break;
- case R_390_16: /* Direct 16 bit. */
- *(u16*) location += sym->st_value;
- break;
- case R_390_32: /* Direct 32 bit. */
- *(u32*) location += sym->st_value;
- break;
- case R_390_64: /* Direct 64 bit. */
- *(u64*) location += sym->st_value;
- break;
- case R_390_PC16: /* PC relative 16 bit. */
- *(u16*) location += sym->st_value
- - (unsigned long )location;
-
- case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */
- *(u16*) location += (sym->st_value
- - (unsigned long )location) >> 1;
- case R_390_PC32: /* PC relative 32 bit. */
- *(u32*) location += sym->st_value
- - (unsigned long )location;
- break;
- case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */
- *(u32*) location += (sym->st_value
- - (unsigned long )location) >> 1;
- break;
- case R_390_PC64: /* PC relative 64 bit. */
- *(u64*) location += sym->st_value
- - (unsigned long )location;
- break;
- case R_390_GOT12: /* 12 bit GOT offset. */
- case R_390_GOT16: /* 16 bit GOT offset. */
- case R_390_GOT32: /* 32 bit GOT offset. */
- case R_390_GOT64: /* 64 bit GOT offset. */
- case R_390_GOTENT: /* 32 bit PC rel. to GOT entry >> 1. */
- // FIXME: TODO
- break;
-
- case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
- case R_390_PLT32: /* 32 bit PC relative PLT address. */
- case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
- case R_390_PLT64: /* 64 bit PC relative PLT address. */
- // FIXME: TODO
- break;
- case R_390_GLOB_DAT: /* Create GOT entry. */
- case R_390_JMP_SLOT: /* Create PLT entry. */
- *location = sym->st_value;
- break;
- case R_390_RELATIVE: /* Adjust by program base. */
- // FIXME: TODO
+ Elf64_Shdr *symtab;
+ Elf64_Sym *symbols;
+ Elf64_Rela *rela;
+ char *strings;
+ int nrela, i, j;
+
+ /* Find symbol table and string table. */
+ symtab = 0;
+ for (i = 0; i < hdr->e_shnum; i++)
+ switch (sechdrs[i].sh_type) {
+ case SHT_SYMTAB:
+ symtab = sechdrs + i;
break;
- case R_390_GOTOFF: /* 32 bit offset to GOT. */
- // FIXME: TODO
- break;
- case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */
- case R_390_GOTPCDBL: /* 32 bit PC rel. GOT shifted by 1. */
- // FIXME: TODO
- break;
- default:
- printk(KERN_ERR "module %s: Unknown relocation: %lu\n",
- me->name,
- (unsigned long)ELF_R_TYPE(rel[i].r_info));
- return -ENOEXEC;
}
+ if (!symtab) {
+ printk(KERN_ERR "module %s: no symbol table\n", me->name);
+ return -ENOEXEC;
+ }
+
+ /* Allocate one syminfo structure per symbol. */
+ me->arch.nsyms = symtab->sh_size / sizeof(Elf64_Sym);
+ me->arch.syminfo = kmalloc(me->arch.nsyms *
+ sizeof(struct mod_arch_syminfo),
+ GFP_KERNEL);
+ if (!me->arch.syminfo)
+ return -ENOMEM;
+ symbols = (void *) hdr + symtab->sh_offset;
+ strings = (void *) hdr + sechdrs[symtab->sh_link].sh_offset;
+ for (i = 0; i < me->arch.nsyms; i++) {
+ if (symbols[i].st_shndx == SHN_UNDEF &&
+ strcmp(strings + symbols[i].st_name,
+ "_GLOBAL_OFFSET_TABLE_") == 0)
+ /* "Define" it as absolute. */
+ symbols[i].st_shndx = SHN_ABS;
+ me->arch.syminfo[i].got_offset = -1UL;
+ me->arch.syminfo[i].plt_offset = -1UL;
+ me->arch.syminfo[i].got_initialized = 0;
+ me->arch.syminfo[i].plt_initialized = 0;
+ }
+
+ /* Search for got/plt relocations. */
+ me->arch.got_size = me->arch.plt_size = 0;
+ for (i = 0; i < hdr->e_shnum; i++) {
+ if (sechdrs[i].sh_type != SHT_RELA)
+ continue;
+ nrela = sechdrs[i].sh_size / sizeof(Elf64_Rela);
+ rela = (void *) hdr + sechdrs[i].sh_offset;
+ for (j = 0; j < nrela; j++)
+ check_rela(rela + j, me);
}
+
+ /* Increase core size by size of got & plt and set start
+ offsets for got and plt. */
+ me->core_size = ALIGN(me->core_size, 4);
+ me->arch.got_offset = me->core_size;
+ me->core_size += me->arch.got_size;
+ me->arch.plt_offset = me->core_size;
+ me->core_size += me->arch.plt_size;
return 0;
}

-int apply_relocate_add(Elf32_Shdr *sechdrs,
- const char *strtab,
- unsigned int symindex,
- unsigned int relsec,
- struct module *me)
+int
+apply_relocate(Elf_Shdr *sechdrs, const char *strtab, unsigned int symindex,
+ unsigned int relsec, struct module *me)
{
- printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
+ printk(KERN_ERR "module %s: RELOCATION unsupported\n",
me->name);
return -ENOEXEC;
}

+static inline int
+apply_rela(Elf64_Rela *rela, Elf64_Addr base, Elf64_Sym *symtab,
+ struct module *me)
+{
+ struct mod_arch_syminfo *info;
+ Elf64_Addr loc, val;
+ int r_type, r_sym;
+
+ /* This is where to make the change */
+ loc = base + rela->r_offset;
+ /* This is the symbol it is referring to. Note that all
+ undefined symbols have been resolved. */
+ r_sym = ELF64_R_SYM(rela->r_info);
+ r_type = ELF64_R_TYPE(rela->r_info);
+ info = me->arch.syminfo + r_sym;
+ val = symtab[r_sym].st_value;
+
+ switch (r_type) {
+ case R_390_8: /* Direct 8 bit. */
+ case R_390_12: /* Direct 12 bit. */
+ case R_390_16: /* Direct 16 bit. */
+ case R_390_32: /* Direct 32 bit. */
+ case R_390_64: /* Direct 64 bit. */
+ val += rela->r_addend;
+ if (r_type == R_390_8)
+ *(unsigned char *) loc = val;
+ else if (r_type == R_390_12)
+ *(unsigned short *) loc = (val & 0xfff) |
+ (*(unsigned short *) loc & 0xf000);
+ else if (r_type == R_390_16)
+ *(unsigned short *) loc = val;
+ else if (r_type == R_390_32)
+ *(unsigned int *) loc = val;
+ else if (r_type == R_390_64)
+ *(unsigned long *) loc = val;
+ break;
+ case R_390_PC16: /* PC relative 16 bit. */
+ case R_390_PC16DBL: /* PC relative 16 bit shifted by 1. */
+ case R_390_PC32DBL: /* PC relative 32 bit shifted by 1. */
+ case R_390_PC32: /* PC relative 32 bit. */
+ case R_390_PC64: /* PC relative 64 bit. */
+ val += rela->r_addend - loc;
+ if (r_type == R_390_PC16)
+ *(unsigned short *) loc = val;
+ else if (r_type == R_390_PC16DBL)
+ *(unsigned short *) loc = val >> 1;
+ else if (r_type == R_390_PC32DBL)
+ *(unsigned int *) loc = val >> 1;
+ else if (r_type == R_390_PC32)
+ *(unsigned int *) loc = val;
+ else if (r_type == R_390_PC64)
+ *(unsigned long *) loc = val;
+ break;
+ case R_390_GOT12: /* 12 bit GOT offset. */
+ case R_390_GOT16: /* 16 bit GOT offset. */
+ case R_390_GOT32: /* 32 bit GOT offset. */
+ case R_390_GOT64: /* 64 bit GOT offset. */
+ case R_390_GOTENT: /* 32 bit PC rel. to GOT entry shifted by 1. */
+ case R_390_GOTPLT12: /* 12 bit offset to jump slot. */
+ case R_390_GOTPLT16: /* 16 bit offset to jump slot. */
+ case R_390_GOTPLT32: /* 32 bit offset to jump slot. */
+ case R_390_GOTPLT64: /* 64 bit offset to jump slot. */
+ case R_390_GOTPLTENT: /* 32 bit rel. offset to jump slot >> 1. */
+ if (info->got_initialized == 0) {
+ Elf64_Addr *gotent;
+ gotent = me->module_core + me->arch.got_offset +
+ info->got_offset;
+ *gotent = val;
+ info->got_initialized = 1;
+ }
+ val = info->got_offset + rela->r_addend;
+ if (r_type == R_390_GOT12 ||
+ r_type == R_390_GOTPLT12)
+ *(unsigned short *) loc = (val & 0xfff) |
+ (*(unsigned short *) loc & 0xf000);
+ else if (r_type == R_390_GOT16 ||
+ r_type == R_390_GOTPLT16)
+ *(unsigned short *) loc = val;
+ else if (r_type == R_390_GOT32 ||
+ r_type == R_390_GOTPLT32)
+ *(unsigned int *) loc = val;
+ else if (r_type == R_390_GOTENT ||
+ r_type == R_390_GOTPLTENT)
+ *(unsigned int *) loc = val >> 1;
+ else if (r_type == R_390_GOT64 ||
+ r_type == R_390_GOTPLT64)
+ *(unsigned long *) loc = val;
+ break;
+ case R_390_PLT16DBL: /* 16 bit PC rel. PLT shifted by 1. */
+ case R_390_PLT32DBL: /* 32 bit PC rel. PLT shifted by 1. */
+ case R_390_PLT32: /* 32 bit PC relative PLT address. */
+ case R_390_PLT64: /* 64 bit PC relative PLT address. */
+ case R_390_PLTOFF16: /* 16 bit offset from GOT to PLT. */
+ case R_390_PLTOFF32: /* 32 bit offset from GOT to PLT. */
+ case R_390_PLTOFF64: /* 16 bit offset from GOT to PLT. */
+ if (info->plt_initialized == 0) {
+ unsigned int *ip;
+ ip = me->module_core + me->arch.plt_offset +
+ info->plt_offset;
+ ip[0] = 0x0d10e310; /* basr 1,0; lg 1,10(1); br 1 */
+ ip[1] = 0x100a0004;
+ ip[2] = 0x07f10000;
+ ip[3] = (unsigned int) (val >> 32);
+ ip[4] = (unsigned int) val;
+ info->plt_initialized = 1;
+ }
+ if (r_type == R_390_PLTOFF16 ||
+ r_type == R_390_PLTOFF32 ||
+ r_type == R_390_PLTOFF64)
+ val = me->arch.plt_offset - me->arch.got_offset +
+ info->plt_offset + rela->r_addend;
+ else
+ val = (Elf64_Addr) me->module_core +
+ me->arch.plt_offset + info->plt_offset +
+ rela->r_addend - loc;
+ if (r_type == R_390_PLT16DBL)
+ *(unsigned short *) loc = val >> 1;
+ else if (r_type == R_390_PLTOFF16)
+ *(unsigned short *) loc = val;
+ else if (r_type == R_390_PLT32DBL)
+ *(unsigned int *) loc = val >> 1;
+ else if (r_type == R_390_PLT32 ||
+ r_type == R_390_PLTOFF32)
+ *(unsigned int *) loc = val;
+ else if (r_type == R_390_PLT64 ||
+ r_type == R_390_PLTOFF64)
+ *(unsigned long *) loc = val;
+ break;
+ case R_390_GOTOFF16: /* 16 bit offset to GOT. */
+ case R_390_GOTOFF32: /* 32 bit offset to GOT. */
+ case R_390_GOTOFF64: /* 64 bit offset to GOT. */
+ val = val + rela->r_addend -
+ ((Elf64_Addr) me->module_core + me->arch.got_offset);
+ if (r_type == R_390_GOTOFF16)
+ *(unsigned short *) loc = val;
+ else if (r_type == R_390_GOTOFF32)
+ *(unsigned int *) loc = val;
+ else if (r_type == R_390_GOTOFF64)
+ *(unsigned long *) loc = val;
+ break;
+ case R_390_GOTPC: /* 32 bit PC relative offset to GOT. */
+ case R_390_GOTPCDBL: /* 32 bit PC rel. off. to GOT shifted by 1. */
+ val = (Elf64_Addr) me->module_core + me->arch.got_offset +
+ rela->r_addend - loc;
+ if (r_type == R_390_GOTPC)
+ *(unsigned int *) loc = val;
+ else if (r_type == R_390_GOTPCDBL)
+ *(unsigned int *) loc = val >> 1;
+ break;
+ case R_390_COPY:
+ case R_390_GLOB_DAT: /* Create GOT entry. */
+ case R_390_JMP_SLOT: /* Create PLT entry. */
+ case R_390_RELATIVE: /* Adjust by program base. */
+ /* Only needed if we want to support loading of
+ modules linked with -shared. */
+ break;
+ default:
+ printk(KERN_ERR "module %s: Unknown relocation: %u\n",
+ me->name, r_type);
+ return -ENOEXEC;
+ }
+ return 0;
+}
+
+int
+apply_relocate_add(Elf64_Shdr *sechdrs, const char *strtab,
+ unsigned int symindex, unsigned int relsec,
+ struct module *me)
+{
+ Elf64_Addr base;
+ Elf64_Sym *symtab;
+ Elf64_Rela *rela;
+ unsigned long i, n;
+ int rc;
+
+ DEBUGP("Applying relocate section %u to %u\n",
+ relsec, sechdrs[relsec].sh_info);
+ base = sechdrs[sechdrs[relsec].sh_info].sh_addr;
+ symtab = (Elf64_Sym *) sechdrs[symindex].sh_addr;
+ rela = (Elf64_Rela *) sechdrs[relsec].sh_addr;
+ n = sechdrs[relsec].sh_size / sizeof(Elf64_Rela);
+ for (i = 0; i < n; i++, rela++) {
+ rc = apply_rela(rela, base, symtab, me);
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
+
int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
struct module *me)
{
+ if (me->arch.syminfo)
+ kfree(me->arch.syminfo);
return 0;
}
diff -urN linux-2.5.62/include/asm-s390/module.h linux-2.5.62-s390/include/asm-s390/module.h
--- linux-2.5.62/include/asm-s390/module.h Mon Feb 17 23:55:49 2003
+++ linux-2.5.62-s390/include/asm-s390/module.h Mon Feb 24 18:24:54 2003
@@ -4,10 +4,28 @@
* This file contains the s390 architecture specific module code.
*/

+struct mod_arch_syminfo
+{
+ unsigned long got_offset;
+ unsigned long plt_offset;
+ int got_initialized;
+ int plt_initialized;
+};
+
struct mod_arch_specific
{
- void *module_got, *module_plt;
- unsigned long got_size, plt_size;
+ /* Starting offset of got in the module core memory. */
+ unsigned long got_offset;
+ /* Starting offset of plt in the module core memory. */
+ unsigned long plt_offset;
+ /* Size of the got. */
+ unsigned long got_size;
+ /* Size of the plt. */
+ unsigned long plt_size;
+ /* Number of symbols in syminfo. */
+ int nsyms;
+ /* Additional symbol information (got and plt offsets). */
+ struct mod_arch_syminfo *syminfo;
};

#ifdef CONFIG_ARCH_S390X
diff -urN linux-2.5.62/include/asm-s390x/module.h linux-2.5.62-s390/include/asm-s390x/module.h
--- linux-2.5.62/include/asm-s390x/module.h Mon Feb 17 23:55:48 2003
+++ linux-2.5.62-s390/include/asm-s390x/module.h Mon Feb 24 18:24:54 2003
@@ -4,10 +4,28 @@
* This file contains the s390 architecture specific module code.
*/

+struct mod_arch_syminfo
+{
+ unsigned long got_offset;
+ unsigned long plt_offset;
+ int got_initialized;
+ int plt_initialized;
+};
+
struct mod_arch_specific
{
- void *module_got, *module_plt;
- unsigned long got_size, plt_size;
+ /* Starting offset of got in the module core memory. */
+ unsigned long got_offset;
+ /* Starting offset of plt in the module core memory. */
+ unsigned long plt_offset;
+ /* Size of the got. */
+ unsigned long got_size;
+ /* Size of the plt. */
+ unsigned long plt_size;
+ /* Number of symbols in syminfo. */
+ int nsyms;
+ /* Additional symbol information (got and plt offsets). */
+ struct mod_arch_syminfo *syminfo;
};

#ifdef CONFIG_ARCH_S390X
diff -urN linux-2.5.62/include/linux/elf.h linux-2.5.62-s390/include/linux/elf.h
--- linux-2.5.62/include/linux/elf.h Mon Feb 17 23:55:57 2003
+++ linux-2.5.62-s390/include/linux/elf.h Mon Feb 24 18:24:54 2003
@@ -433,35 +433,82 @@
#define R_PPC_NUM 37

/* s390 relocations defined by the ABIs */
-#define R_390_NONE 0 /* No reloc. */
-#define R_390_8 1 /* Direct 8 bit. */
-#define R_390_12 2 /* Direct 12 bit. */
-#define R_390_16 3 /* Direct 16 bit. */
-#define R_390_32 4 /* Direct 32 bit. */
-#define R_390_PC32 5 /* PC relative 32 bit. */
-#define R_390_GOT12 6 /* 12 bit GOT offset. */
-#define R_390_GOT32 7 /* 32 bit GOT offset. */
-#define R_390_PLT32 8 /* 32 bit PC relative PLT address. */
-#define R_390_COPY 9 /* Copy symbol at runtime. */
-#define R_390_GLOB_DAT 10 /* Create GOT entry. */
-#define R_390_JMP_SLOT 11 /* Create PLT entry. */
-#define R_390_RELATIVE 12 /* Adjust by program base. */
-#define R_390_GOTOFF 13 /* 32 bit offset to GOT. */
-#define R_390_GOTPC 14 /* 32 bit PC relative offset to GOT. */
-#define R_390_GOT16 15 /* 16 bit GOT offset. */
-#define R_390_PC16 16 /* PC relative 16 bit. */
-#define R_390_PC16DBL 17 /* PC relative 16 bit shifted by 1. */
-#define R_390_PLT16DBL 18 /* 16 bit PC rel. PLT shifted by 1. */
-#define R_390_PC32DBL 19 /* PC relative 32 bit shifted by 1. */
-#define R_390_PLT32DBL 20 /* 32 bit PC rel. PLT shifted by 1. */
-#define R_390_GOTPCDBL 21 /* 32 bit PC rel. GOT shifted by 1. */
-#define R_390_64 22 /* Direct 64 bit. */
-#define R_390_PC64 23 /* PC relative 64 bit. */
-#define R_390_GOT64 24 /* 64 bit GOT offset. */
-#define R_390_PLT64 25 /* 64 bit PC relative PLT address. */
-#define R_390_GOTENT 26 /* 32 bit PC rel. to GOT entry >> 1. */
+#define R_390_NONE 0 /* No reloc. */
+#define R_390_8 1 /* Direct 8 bit. */
+#define R_390_12 2 /* Direct 12 bit. */
+#define R_390_16 3 /* Direct 16 bit. */
+#define R_390_32 4 /* Direct 32 bit. */
+#define R_390_PC32 5 /* PC relative 32 bit. */
+#define R_390_GOT12 6 /* 12 bit GOT offset. */
+#define R_390_GOT32 7 /* 32 bit GOT offset. */
+#define R_390_PLT32 8 /* 32 bit PC relative PLT address. */
+#define R_390_COPY 9 /* Copy symbol at runtime. */
+#define R_390_GLOB_DAT 10 /* Create GOT entry. */
+#define R_390_JMP_SLOT 11 /* Create PLT entry. */
+#define R_390_RELATIVE 12 /* Adjust by program base. */
+#define R_390_GOTOFF32 13 /* 32 bit offset to GOT. */
+#define R_390_GOTPC 14 /* 32 bit PC rel. offset to GOT. */
+#define R_390_GOT16 15 /* 16 bit GOT offset. */
+#define R_390_PC16 16 /* PC relative 16 bit. */
+#define R_390_PC16DBL 17 /* PC relative 16 bit shifted by 1. */
+#define R_390_PLT16DBL 18 /* 16 bit PC rel. PLT shifted by 1. */
+#define R_390_PC32DBL 19 /* PC relative 32 bit shifted by 1. */
+#define R_390_PLT32DBL 20 /* 32 bit PC rel. PLT shifted by 1. */
+#define R_390_GOTPCDBL 21 /* 32 bit PC rel. GOT shifted by 1. */
+#define R_390_64 22 /* Direct 64 bit. */
+#define R_390_PC64 23 /* PC relative 64 bit. */
+#define R_390_GOT64 24 /* 64 bit GOT offset. */
+#define R_390_PLT64 25 /* 64 bit PC relative PLT address. */
+#define R_390_GOTENT 26 /* 32 bit PC rel. to GOT entry >> 1. */
+#define R_390_GOTOFF16 27 /* 16 bit offset to GOT. */
+#define R_390_GOTOFF64 28 /* 64 bit offset to GOT. */
+#define R_390_GOTPLT12 29 /* 12 bit offset to jump slot. */
+#define R_390_GOTPLT16 30 /* 16 bit offset to jump slot. */
+#define R_390_GOTPLT32 31 /* 32 bit offset to jump slot. */
+#define R_390_GOTPLT64 32 /* 64 bit offset to jump slot. */
+#define R_390_GOTPLTENT 33 /* 32 bit rel. offset to jump slot. */
+#define R_390_PLTOFF16 34 /* 16 bit offset from GOT to PLT. */
+#define R_390_PLTOFF32 35 /* 32 bit offset from GOT to PLT. */
+#define R_390_PLTOFF64 36 /* 16 bit offset from GOT to PLT. */
+#define R_390_TLS_LOAD 37 /* Tag for load insn in TLS code. */
+#define R_390_TLS_GDCALL 38 /* Tag for function call in general
+ dynamic TLS code. */
+#define R_390_TLS_LDCALL 39 /* Tag for function call in local
+ dynamic TLS code. */
+#define R_390_TLS_GD32 40 /* Direct 32 bit for general dynamic
+ thread local data. */
+#define R_390_TLS_GD64 41 /* Direct 64 bit for general dynamic
+ thread local data. */
+#define R_390_TLS_GOTIE12 42 /* 12 bit GOT offset for static TLS
+ block offset. */
+#define R_390_TLS_GOTIE32 43 /* 32 bit GOT offset for static TLS
+ block offset. */
+#define R_390_TLS_GOTIE64 44 /* 64 bit GOT offset for static TLS
+ block offset. */
+#define R_390_TLS_LDM32 45 /* Direct 32 bit for local dynamic
+ thread local data in LD code. */
+#define R_390_TLS_LDM64 46 /* Direct 64 bit for local dynamic
+ thread local data in LD code. */
+#define R_390_TLS_IE32 47 /* 32 bit address of GOT entry for
+ negated static TLS block offset. */
+#define R_390_TLS_IE64 48 /* 64 bit address of GOT entry for
+ negated static TLS block offset. */
+#define R_390_TLS_IEENT 49 /* 32 bit rel. offset to GOT entry for
+ negated static TLS block offset. */
+#define R_390_TLS_LE32 50 /* 32 bit negated offset relative to
+ static TLS block. */
+#define R_390_TLS_LE64 51 /* 64 bit negated offset relative to
+ static TLS block. */
+#define R_390_TLS_LDO32 52 /* 32 bit offset relative to TLS
+ block. */
+#define R_390_TLS_LDO64 53 /* 64 bit offset relative to TLS
+ block. */
+#define R_390_TLS_DTPMOD 54 /* ID of module containing symbol. */
+#define R_390_TLS_DTPOFF 55 /* Offset in TLS block. */
+#define R_390_TLS_TPOFF 56 /* Negate offset in static TLS
+ block. */
/* Keep this the last entry. */
-#define R_390_NUM 27
+#define R_390_NUM 57

/* x86-64 relocation types */
#define R_X86_64_NONE 0 /* No reloc */
@@ -484,37 +531,6 @@

#define R_X86_64_NUM 16

-/* s390 relocations defined by the ABIs */
-#define R_390_NONE 0 /* No reloc. */
-#define R_390_8 1 /* Direct 8 bit. */
-#define R_390_12 2 /* Direct 12 bit. */
-#define R_390_16 3 /* Direct 16 bit. */
-#define R_390_32 4 /* Direct 32 bit. */
-#define R_390_PC32 5 /* PC relative 32 bit. */
-#define R_390_GOT12 6 /* 12 bit GOT offset. */
-#define R_390_GOT32 7 /* 32 bit GOT offset. */
-#define R_390_PLT32 8 /* 32 bit PC relative PLT address. */
-#define R_390_COPY 9 /* Copy symbol at runtime. */
-#define R_390_GLOB_DAT 10 /* Create GOT entry. */
-#define R_390_JMP_SLOT 11 /* Create PLT entry. */
-#define R_390_RELATIVE 12 /* Adjust by program base. */
-#define R_390_GOTOFF 13 /* 32 bit offset to GOT. */
-#define R_390_GOTPC 14 /* 32 bit PC relative offset to GOT. */
-#define R_390_GOT16 15 /* 16 bit GOT offset. */
-#define R_390_PC16 16 /* PC relative 16 bit. */
-#define R_390_PC16DBL 17 /* PC relative 16 bit shifted by 1. */
-#define R_390_PLT16DBL 18 /* 16 bit PC rel. PLT shifted by 1. */
-#define R_390_PC32DBL 19 /* PC relative 32 bit shifted by 1. */
-#define R_390_PLT32DBL 20 /* 32 bit PC rel. PLT shifted by 1. */
-#define R_390_GOTPCDBL 21 /* 32 bit PC rel. GOT shifted by 1. */
-#define R_390_64 22 /* Direct 64 bit. */
-#define R_390_PC64 23 /* PC relative 64 bit. */
-#define R_390_GOT64 24 /* 64 bit GOT offset. */
-#define R_390_PLT64 25 /* 64 bit PC relative PLT address. */
-#define R_390_GOTENT 26 /* 32 bit PC rel. to GOT entry >> 1. */
-/* Keep this the last entry. */
-#define R_390_NUM 27
-
/* Legal values for e_flags field of Elf64_Ehdr. */

#define EF_ALPHA_32BIT 1 /* All addresses are below 2GB */
-
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