mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2025-01-17 13:58:46 +00:00
23c6e901c7
When testing modules in OpenRISC I found R_OR1K_AHI16 (signed adjusted high 16-bit) and R_OR1K_SLO16 (split low 16-bit) relocations are used in modules but not implemented yet. This patch implements the relocations. I have tested with a few modules. Signed-off-by: Stafford Horne <shorne@gmail.com>
77 lines
2.0 KiB
C
77 lines
2.0 KiB
C
// 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;
|
|
}
|