/* * arch/v850/kernel/module.c -- Architecture-specific module functions * *  Copyright (C) 2002,03  NEC Electronics Corporation *  Copyright (C) 2002,03  Miles Bader <miles@gnu.org> *  Copyright (C) 2001,03  Rusty Russell * * This file is subject to the terms and conditions of the GNU General * Public License.  See the file COPYING in the main directory of this * archive for more details. * * Written by Miles Bader <miles@gnu.org> * * Derived in part from arch/ppc/kernel/module.c */#include <linux/kernel.h>#include <linux/vmalloc.h>#include <linux/moduleloader.h>#include <linux/elf.h>#if 0#define DEBUGP printk#else#define DEBUGP(fmt , ...)#endifvoid *module_alloc (unsigned long size){	return size == 0 ? 0 : vmalloc (size);}void module_free (struct module *mod, void *module_region){	vfree (module_region);	/* FIXME: If module_region == mod->init_region, trim exception           table entries. */}int module_finalize (const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs,		     struct module *mod){	return 0;}/* Count how many different relocations (different symbol, different   addend) */static unsigned int count_relocs(const Elf32_Rela *rela, unsigned int num){	unsigned int i, j, ret = 0;	/* Sure, this is order(n^2), but it's usually short, and not           time critical */	for (i = 0; i < num; i++) {		for (j = 0; j < i; j++) {			/* If this addend appeared before, it's                           already been counted */			if (ELF32_R_SYM(rela[i].r_info)			    == ELF32_R_SYM(rela[j].r_info)			    && rela[i].r_addend == rela[j].r_addend)				break;		}		if (j == i) ret++;	}	return ret;}/* Get the potential trampolines size required of the init and   non-init sections */static unsigned long get_plt_size(const Elf32_Ehdr *hdr,				  const Elf32_Shdr *sechdrs,				  const char *secstrings,				  int is_init){	unsigned long ret = 0;	unsigned i;	/* Everything marked ALLOC (this includes the exported           symbols) */	for (i = 1; i < hdr->e_shnum; i++) {		/* If it's called *.init*, and we're not init, we're                   not interested */		if ((strstr(secstrings + sechdrs[i].sh_name, ".init") != 0)		    != is_init)			continue;		if (sechdrs[i].sh_type == SHT_RELA) {			DEBUGP("Found relocations in section %u\n", i);			DEBUGP("Ptr: %p.  Number: %u\n",			       (void *)hdr + sechdrs[i].sh_offset,			       sechdrs[i].sh_size / sizeof(Elf32_Rela));			ret += count_relocs((void *)hdr					     + sechdrs[i].sh_offset,					     sechdrs[i].sh_size					     / sizeof(Elf32_Rela))				* sizeof(struct v850_plt_entry);		}	}	return ret;}int module_frob_arch_sections(Elf32_Ehdr *hdr,			      Elf32_Shdr *sechdrs,			      char *secstrings,			      struct module *me){	unsigned int i;	/* Find .plt and .pltinit sections */	for (i = 0; i < hdr->e_shnum; i++) {		if (strcmp(secstrings + sechdrs[i].sh_name, ".init.plt") == 0)			me->arch.init_plt_section = i;		else if (strcmp(secstrings + sechdrs[i].sh_name, ".plt") == 0)			me->arch.core_plt_section = i;	}	if (!me->arch.core_plt_section || !me->arch.init_plt_section) {		printk("Module doesn't contain .plt or .plt.init sections.\n");		return -ENOEXEC;	}	/* Override their sizes */	sechdrs[me->arch.core_plt_section].sh_size		= get_plt_size(hdr, sechdrs, secstrings, 0);	sechdrs[me->arch.init_plt_section].sh_size		= get_plt_size(hdr, sechdrs, secstrings, 1);	return 0;}int apply_relocate (Elf32_Shdr *sechdrs, const char *strtab,		    unsigned int symindex, unsigned int relsec,		    struct module *mod){	printk ("Barf\n");	return -ENOEXEC;}/* Set up a trampoline in the PLT to bounce us to the distant function */static uint32_t do_plt_call (void *location, Elf32_Addr val,			     Elf32_Shdr *sechdrs, struct module *mod){	struct v850_plt_entry *entry;	/* Instructions used to do the indirect jump.  */	uint32_t tramp[2];	/* We have to trash a register, so we assume that any control	   transfer more than 21-bits away must be a function call	   (so we can use a call-clobbered register).  */	tramp[0] = 0x0621 + ((val & 0xffff) << 16);   /* mov sym, r1 ... */	tramp[1] = ((val >> 16) & 0xffff) + 0x610000; /* ...; jmp r1 */	/* Init, or core PLT? */	if (location >= mod->module_core	    && location < mod->module_core + mod->core_size)		entry = (void *)sechdrs[mod->arch.core_plt_section].sh_addr;	else		entry = (void *)sechdrs[mod->arch.init_plt_section].sh_addr;	/* Find this entry, or if that fails, the next avail. entry */	while (entry->tramp[0])		if (entry->tramp[0] == tramp[0] && entry->tramp[1] == tramp[1])			return (uint32_t)entry;		else			entry++;	entry->tramp[0] = tramp[0];	entry->tramp[1] = tramp[1];	return (uint32_t)entry;}int apply_relocate_add (Elf32_Shdr *sechdrs, const char *strtab,			unsigned int symindex, unsigned int relsec,			struct module *mod){	unsigned int i;	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;	DEBUGP ("Applying relocate section %u to %u\n", relsec,		sechdrs[relsec].sh_info);	for (i = 0; i < sechdrs[relsec].sh_size / sizeof (*rela); i++) {		/* This is where to make the change */		uint32_t *loc			= ((void *)sechdrs[sechdrs[relsec].sh_info].sh_addr			   + rela[i].r_offset);		/* This is the symbol it is referring to.  Note that all		   undefined symbols have been resolved.  */		Elf32_Sym *sym			= ((Elf32_Sym *)sechdrs[symindex].sh_addr			   + ELF32_R_SYM (rela[i].r_info));		uint32_t val = sym->st_value + rela[i].r_addend;		switch (ELF32_R_TYPE (rela[i].r_info)) {		case R_V850_32:			/* We write two shorts instead of a long because even			   32-bit insns only need half-word alignment, but			   32-bit data writes need to be long-word aligned.  */			val += ((uint16_t *)loc)[0];			val += ((uint16_t *)loc)[1] << 16;			((uint16_t *)loc)[0] = val & 0xffff;			((uint16_t *)loc)[1] = (val >> 16) & 0xffff;			break;		case R_V850_22_PCREL:			/* Maybe jump indirectly via a PLT table entry.  */			if ((int32_t)(val - (uint32_t)loc) > 0x1fffff			    || (int32_t)(val - (uint32_t)loc) < -0x200000)				val = do_plt_call (loc, val, sechdrs, mod);			val -= (uint32_t)loc;			/* We write two shorts instead of a long because			   even 32-bit insns only need half-word alignment,			   but 32-bit data writes need to be long-word			   aligned.  */			((uint16_t *)loc)[0] =				(*(uint16_t *)loc & 0xffc0) /* opcode + reg */				| ((val >> 16) & 0xffc03f); /* offs high */			((uint16_t *)loc)[1] =				(val & 0xffff);		    /* offs low */			break;		default:			printk (KERN_ERR "module %s: Unknown reloc: %u\n",				mod->name, ELF32_R_TYPE (rela[i].r_info));			return -ENOEXEC;		}	}	return 0;}voidmodule_arch_cleanup(struct module *mod){}