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66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <m4x@m4xw.net> wrote this file. As long as you retain this notice you can do
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* whatever you want with this stuff. If we meet some day, and you think this
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* stuff is worth it, you can buy me a beer in return. M4xw
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* ----------------------------------------------------------------------------
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*/
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#include "elfload.h"
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#if defined(__arm__)
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// Taken from http://infocenter.arm.com/help/topic/com.arm.doc.ihi0044f/IHI0044F_aaelf.pdf
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#define R_ARM_NONE 0
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#define R_ARM_ABS32 2
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#define R_ARM_JUMP_SLOT 22
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#define R_ARM_GLOB_DAT 21
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#define R_ARM_RELATIVE 23
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el_status el_applyrel(el_ctx *ctx, Elf_Rel *rel)
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{
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uint32_t sym = ELF_R_SYM(rel->r_info); // Symbol offset
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uint32_t type = ELF_R_TYPE(rel->r_info); // Relocation Type
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uintptr_t *p = (uintptr_t *)(rel->r_offset + ctx->base_load_paddr); // Target Addr
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#if 0 // For later symbol usage
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Elf32_Sym *elfSym;
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const char *symbolName;
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// We resolve relocs from the originating elf-image
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elfSym = (Elf32_Sym *)(ctx->symtab.sh_offset + (char *)buffteg) + sym;
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int strtab_offset = ctx->shstr.sh_offset;
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char *strtab = (char *)buffteg + strtab_offset;
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symbolName = strtab + elfSym->st_name;
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//EL_DEBUG("Str: %s sz: %x val: %x\n", symbolName, elfSym->st_size, elfSym->st_value);
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#endif
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switch (type)
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{
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case R_ARM_NONE:
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EL_DEBUG("R_ARM_NONE\n");
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break;
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case R_ARM_JUMP_SLOT:
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case R_ARM_ABS32:
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case R_ARM_GLOB_DAT:
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// Stubbed for later purpose
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//*p += elfSym->st_value; // + vaddr from sec
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//*p |= 0; // 1 if Thumb && STT_FUNC, ignored for now
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break;
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case R_ARM_RELATIVE: // Needed for PIE
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if (sym)
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{
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return EL_BADREL;
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}
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*p += ctx->base_load_vaddr;
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break;
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default:
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return EL_BADREL;
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}
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return EL_OK;
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}
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#endif
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