elf_reloc.c

来自「RT-Thread是发展中的下一代微内核嵌入式实时操作系统」· C语言 代码 · 共 54 行

#include "arch.h"

#include "lib.h"

#include "elf.h"

#include "mkservice.h"


#ifdef DEBUG_BOOT_IMAGE
#define elf_dbg(x,y...) printf(x, ##y)

#else
#define elf_dbg(x,y...)
#endif

int relocate_rel(Elf32_Rel *rel, Elf32_Addr sym_val, char *target_sect)
{
	Elf32_Addr *where, tmp;
	Elf32_Sword addend;

	where = (Elf32_Addr *)(target_sect + rel->r_offset);

	switch (ELF32_R_TYPE(rel->r_info))
	{
	case R_ARM_NONE:
		break;
	case R_ARM_ABS32:
		*where += (Elf32_Addr)phys_to_virt(sym_val);
		/* elf_dbg("R_ARM_ABS32: %x -> %x\n", where, *where); */
		break;
	case R_ARM_PC24:
	case R_ARM_PLT32:
		addend = *where & 0x00ffffff;
		if (addend & 0x00800000)
			addend |= 0xff000000;
		tmp = sym_val - (Elf32_Addr)where + (addend << 2);
		tmp >>= 2;
		*where = (*where & 0xff000000) | (tmp & 0x00ffffff);
		/* elf_dbg("R_ARM_PC24: %x -> %x\n", where, *where); */
		break;
	default:
		elf_dbg("relocation fail\n");
		return -1;
	}
	return 0;
}

int relocate_rela(Elf32_Rela *rela, Elf32_Addr sym_val, char *target_sec)
{
	elf_dbg("Invalid relocation type\n");
	return -1;
}