[net-next-2.6.git] / arch / h8300 / kernel / module.c

#include <linux/moduleloader.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>

#if 0
#define DEBUGP printk
#else
#define DEBUGP(fmt...)
#endif

void *module_alloc(unsigned long size)
{
	if (size == 0)
		return NULL;
	return vmalloc(size);
}


/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
	vfree(module_region);
}

/* We don't need anything special. */
int module_frob_arch_sections(Elf_Ehdr *hdr,
			      Elf_Shdr *sechdrs,
			      char *secstrings,
			      struct module *mod)
{
	return 0;
}

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

int apply_relocate_add(Elf32_Shdr *sechdrs,
		       const char *strtab,
		       unsigned int symindex,
		       unsigned int relsec,
		       struct module *me)
{
	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 = (uint32_t *)(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 v = sym->st_value + rela[i].r_addend;

		switch (ELF32_R_TYPE(rela[i].r_info)) {
		case R_H8_DIR24R8:
			loc = (uint32_t *)((uint32_t)loc - 1);
			*loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v);
			break;
		case R_H8_DIR24A8:
			if (ELF32_R_SYM(rela[i].r_info))
				*loc += v;
			break;
		case R_H8_DIR32:
		case R_H8_DIR32A16:
			*loc += v;
			break;
		case R_H8_PCREL16:
			v -= (unsigned long)loc + 2;
			if ((Elf32_Sword)v > 0x7fff || 
			    (Elf32_Sword)v < -(Elf32_Sword)0x8000)
				goto overflow;
			else 
				*(unsigned short *)loc = v;
			break;
		case R_H8_PCREL8:
			v -= (unsigned long)loc + 1;
			if ((Elf32_Sword)v > 0x7f || 
			    (Elf32_Sword)v < -(Elf32_Sword)0x80)
				goto overflow;
			else 
				*(unsigned char *)loc = v;
			break;
		default:
			printk(KERN_ERR "module %s: Unknown relocation: %u\n",
			       me->name, ELF32_R_TYPE(rela[i].r_info));
			return -ENOEXEC;
		}
	}
	return 0;
 overflow:
	printk(KERN_ERR "module %s: relocation offset overflow: %08x\n",
	       me->name, rela[i].r_offset);
	return -ENOEXEC;
}

int module_finalize(const Elf_Ehdr *hdr,
		    const Elf_Shdr *sechdrs,
		    struct module *me)
{
	return 0;
}

void module_arch_cleanup(struct module *mod)
{
}
Commit	Line	Data
1da177e4 LT	1	#include <linux/moduleloader.h>
	2	#include <linux/elf.h>
	3	#include <linux/vmalloc.h>
	4	#include <linux/fs.h>
	5	#include <linux/string.h>
	6	#include <linux/kernel.h>
	7
	8	#if 0
	9	#define DEBUGP printk
	10	#else
	11	#define DEBUGP(fmt...)
	12	#endif
	13
	14	void *module_alloc(unsigned long size)
	15	{
	16	if (size == 0)
	17	return NULL;
	18	return vmalloc(size);
	19	}
	20
	21
	22	/* Free memory returned from module_alloc */
	23	void module_free(struct module mod, void module_region)
	24	{
	25	vfree(module_region);
1da177e4 LT	26	}
	27
	28	/* We don't need anything special. */
	29	int module_frob_arch_sections(Elf_Ehdr *hdr,
	30	Elf_Shdr *sechdrs,
	31	char *secstrings,
	32	struct module *mod)
	33	{
	34	return 0;
	35	}
	36
	37	int apply_relocate(Elf32_Shdr *sechdrs,
	38	const char *strtab,
	39	unsigned int symindex,
	40	unsigned int relsec,
	41	struct module *me)
	42	{
	43	printk(KERN_ERR "module %s: RELOCATION unsupported\n",
	44	me->name);
	45	return -ENOEXEC;
	46	}
	47
	48	int apply_relocate_add(Elf32_Shdr *sechdrs,
	49	const char *strtab,
	50	unsigned int symindex,
	51	unsigned int relsec,
	52	struct module *me)
	53	{
	54	unsigned int i;
	55	Elf32_Rela rela = (void )sechdrs[relsec].sh_addr;
	56
	57	DEBUGP("Applying relocate section %u to %u\n", relsec,
	58	sechdrs[relsec].sh_info);
	59	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
	60	/* This is where to make the change */
	61	uint32_t loc = (uint32_t )(sechdrs[sechdrs[relsec].sh_info].sh_addr
	62	+ rela[i].r_offset);
	63	/* This is the symbol it is referring to. Note that all
	64	undefined symbols have been resolved. */
	65	Elf32_Sym sym = (Elf32_Sym )sechdrs[symindex].sh_addr
	66	+ ELF32_R_SYM(rela[i].r_info);
	67	uint32_t v = sym->st_value + rela[i].r_addend;
	68
	69	switch (ELF32_R_TYPE(rela[i].r_info)) {
	70	case R_H8_DIR24R8:
	71	loc = (uint32_t *)((uint32_t)loc - 1);
	72	loc = (loc & 0xff000000) \| ((*loc & 0xffffff) + v);
	73	break;
	74	case R_H8_DIR24A8:
	75	if (ELF32_R_SYM(rela[i].r_info))
	76	*loc += v;
	77	break;
	78	case R_H8_DIR32:
	79	case R_H8_DIR32A16:
	80	*loc += v;
	81	break;
	82	case R_H8_PCREL16:
	83	v -= (unsigned long)loc + 2;
	84	if ((Elf32_Sword)v > 0x7fff \|\|
	85	(Elf32_Sword)v < -(Elf32_Sword)0x8000)
	86	goto overflow;
	87	else
	88	(unsigned short )loc = v;
	89	break;
90	case R_H8_PCREL8:
91	v -= (unsigned long)loc + 1;
92	if ((Elf32_Sword)v > 0x7f \|\|
93	(Elf32_Sword)v < -(Elf32_Sword)0x80)
94	goto overflow;
95	else
96	(unsigned char )loc = v;
97	break;
98	default:
99	printk(KERN_ERR "module %s: Unknown relocation: %u\n",
100	me->name, ELF32_R_TYPE(rela[i].r_info));
101	return -ENOEXEC;
102	}
103	}
104	return 0;
105	overflow:
106	printk(KERN_ERR "module %s: relocation offset overflow: %08x\n",
107	me->name, rela[i].r_offset);
108	return -ENOEXEC;
109	}
110
111	int module_finalize(const Elf_Ehdr *hdr,
112	const Elf_Shdr *sechdrs,
113	struct module *me)
114	{
5336377d	115	return 0;
1da177e4 LT	116	}
	117
	118	void module_arch_cleanup(struct module *mod)
	119	{
	120	}