diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arc/include/asm/module.h | 4 | ||||
| -rw-r--r-- | arch/arc/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/arc/kernel/module.c | 87 |
3 files changed, 93 insertions, 0 deletions
diff --git a/arch/arc/include/asm/module.h b/arch/arc/include/asm/module.h index 165d768d00c..234b4354e2b 100644 --- a/arch/arc/include/asm/module.h +++ b/arch/arc/include/asm/module.h @@ -14,4 +14,8 @@ #include <asm-generic/module.h> +#define MODULE_PROC_FAMILY "ARC700" + +#define MODULE_ARCH_VERMAGIC MODULE_PROC_FAMILY + #endif /* _ASM_ARC_MODULE_H */ diff --git a/arch/arc/kernel/Makefile b/arch/arc/kernel/Makefile index f4885891dab..f32f65f9885 100644 --- a/arch/arc/kernel/Makefile +++ b/arch/arc/kernel/Makefile @@ -12,6 +12,8 @@ obj-y := arcksyms.o setup.o irq.o time.o reset.o ptrace.o entry.o process.o obj-y += signal.o traps.o sys.o troubleshoot.o stacktrace.o clk.o obj-y += devtree.o +obj-$(CONFIG_MODULES) += arcksyms.o module.o + obj-$(CONFIG_ARC_FPU_SAVE_RESTORE) += fpu.o CFLAGS_fpu.o += -mdpfp diff --git a/arch/arc/kernel/module.c b/arch/arc/kernel/module.c new file mode 100644 index 00000000000..a1bb70d6e97 --- /dev/null +++ b/arch/arc/kernel/module.c @@ -0,0 +1,87 @@ +/* + * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/module.h> +#include <linux/moduleloader.h> +#include <linux/kernel.h> +#include <linux/elf.h> +#include <linux/vmalloc.h> +#include <linux/slab.h> +#include <linux/fs.h> +#include <linux/string.h> + +static inline void arc_write_me(unsigned short *addr, unsigned long value) +{ + *addr = (value & 0xffff0000) >> 16; + *(addr + 1) = (value & 0xffff); +} + +int apply_relocate_add(Elf32_Shdr *sechdrs, + const char *strtab, + unsigned int symindex, /* sec index for sym tbl */ + unsigned int relsec, /* sec index for relo sec */ + struct module *module) +{ + int i, n; + Elf32_Rela *rel_entry = (void *)sechdrs[relsec].sh_addr; + Elf32_Sym *sym_entry, *sym_sec; + Elf32_Addr relocation; + Elf32_Addr location; + Elf32_Addr sec_to_patch; + int relo_type; + + sec_to_patch = sechdrs[sechdrs[relsec].sh_info].sh_addr; + sym_sec = (Elf32_Sym *) sechdrs[symindex].sh_addr; + n = sechdrs[relsec].sh_size / sizeof(*rel_entry); + + pr_debug("\n========== Module Sym reloc ===========================\n"); + pr_debug("Section to fixup %x\n", sec_to_patch); + pr_debug("=========================================================\n"); + pr_debug("rela->r_off | rela->addend | sym->st_value | ADDR | VALUE\n"); + pr_debug("=========================================================\n"); + + /* Loop thru entries in relocation section */ + for (i = 0; i < n; i++) { + + /* This is where to make the change */ + location = sec_to_patch + rel_entry[i].r_offset; + + /* This is the symbol it is referring to. Note that all + undefined symbols have been resolved. */ + sym_entry = sym_sec + ELF32_R_SYM(rel_entry[i].r_info); + + relocation = sym_entry->st_value + rel_entry[i].r_addend; + + pr_debug("\t%x\t\t%x\t\t%x %x %x [%s]\n", + rel_entry[i].r_offset, rel_entry[i].r_addend, + sym_entry->st_value, location, relocation, + strtab + sym_entry->st_name); + + /* This assumes modules are built with -mlong-calls + * so any branches/jumps are absolute 32 bit jmps + * global data access again is abs 32 bit. + * Both of these are handled by same relocation type + */ + relo_type = ELF32_R_TYPE(rel_entry[i].r_info); + + if (likely(R_ARC_32_ME == relo_type)) + arc_write_me((unsigned short *)location, relocation); + else if (R_ARC_32 == relo_type) + *((Elf32_Addr *) location) = relocation; + else + goto relo_err; + + } + return 0; + +relo_err: + pr_err("%s: unknown relocation: %u\n", + module->name, ELF32_R_TYPE(rel_entry[i].r_info)); + return -ENOEXEC; + +} |