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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OpenRISC module.c
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* Modifications for the OpenRISC architecture:
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
*/
#include <linux/moduleloader.h>
#include <linux/elf.h>
int apply_relocate_add(Elf32_Shdr *sechdrs,
const char *strtab,
unsigned int symindex,
unsigned int relsec,
struct module *me)
{
unsigned int i;
Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
Elf32_Sym *sym;
uint32_t *location;
uint32_t value;
pr_debug("Applying relocate section %u to %u\n", relsec,
sechdrs[relsec].sh_info);
for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
/* This is where to make the change */
location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
+ rel[i].r_offset;
/* This is the symbol it is referring to. Note that all
undefined symbols have been resolved. */
sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+ ELF32_R_SYM(rel[i].r_info);
value = sym->st_value + rel[i].r_addend;
switch (ELF32_R_TYPE(rel[i].r_info)) {
case R_OR1K_32:
*location = value;
break;
case R_OR1K_LO_16_IN_INSN:
*((uint16_t *)location + 1) = value;
break;
case R_OR1K_HI_16_IN_INSN:
*((uint16_t *)location + 1) = value >> 16;
break;
case R_OR1K_INSN_REL_26:
value -= (uint32_t)location;
value >>= 2;
value &= 0x03ffffff;
value |= *location & 0xfc000000;
*location = value;
break;
case R_OR1K_AHI16:
/* Adjust the operand to match with a signed LO16. */
value += 0x8000;
*((uint16_t *)location + 1) = value >> 16;
break;
case R_OR1K_SLO16:
/* Split value lower 16-bits. */
value = ((value & 0xf800) << 10) | (value & 0x7ff);
*location = (*location & ~0x3e007ff) | value;
break;
default:
pr_err("module %s: Unknown relocation: %u\n",
me->name, ELF32_R_TYPE(rel[i].r_info));
break;
}
}
return 0;
}
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