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// SPDX-License-Identifier: GPL-2.0
/*
* (C) Copyright 2022 Advanced Micro Devices, Inc
* Michal Simek <michal.simek@amd.com>
*/
#include <common.h>
#include <elf.h>
#define R_MICROBLAZE_NONE 0
#define R_MICROBLAZE_32 1
#define R_MICROBLAZE_REL 16
#define R_MICROBLAZE_GLOB_DAT 18
/**
* mb_fix_rela - update relocation to new address
* @reloc_addr: new relocation address
* @verbose: enable version messages
* @rela_start: rela section start
* @rela_end: rela section end
* @dyn_start: dynamic section start
* @origin_addr: address where u-boot starts(doesn't need to be CONFIG_TEXT_BASE)
*/
void mb_fix_rela(u32 reloc_addr, u32 verbose, u32 rela_start,
u32 rela_end, u32 dyn_start, u32 origin_addr)
{
u32 num, type, mask, i, reloc_off;
/*
* Return in case u-boot.elf is used directly.
* Skip it when u-boot.bin is loaded to different address than
* CONFIG_TEXT_BASE. In this case relocation is necessary to run.
*/
if (reloc_addr == CONFIG_TEXT_BASE) {
debug_cond(verbose,
"Relocation address is the same - skip relocation\n");
return;
}
reloc_off = reloc_addr - origin_addr;
debug_cond(verbose, "Relocation address:\t0x%08x\n", reloc_addr);
debug_cond(verbose, "Relocation offset:\t0x%08x\n", reloc_off);
debug_cond(verbose, "Origin address:\t0x%08x\n", origin_addr);
debug_cond(verbose, "Rela start:\t0x%08x\n", rela_start);
debug_cond(verbose, "Rela end:\t0x%08x\n", rela_end);
debug_cond(verbose, "Dynsym start:\t0x%08x\n", dyn_start);
num = (rela_end - rela_start) / sizeof(Elf32_Rela);
debug_cond(verbose, "Number of entries:\t%u\n", num);
for (i = 0; i < num; i++) {
Elf32_Rela *rela;
u32 temp;
rela = (Elf32_Rela *)(rela_start + sizeof(Elf32_Rela) * i);
mask = 0xffULL; /* would be different on 32-bit */
type = rela->r_info & mask;
debug_cond(verbose, "\nRela possition:\t%d/0x%x\n",
i, (u32)rela);
switch (type) {
case R_MICROBLAZE_REL:
temp = *(u32 *)rela->r_offset;
debug_cond(verbose, "Type:\tREL\n");
debug_cond(verbose, "Rela r_offset:\t\t0x%x\n", rela->r_offset);
debug_cond(verbose, "Rela r_info:\t\t0x%x\n", rela->r_info);
debug_cond(verbose, "Rela r_addend:\t\t0x%x\n", rela->r_addend);
debug_cond(verbose, "Value at r_offset:\t0x%x\n", temp);
rela->r_offset += reloc_off;
rela->r_addend += reloc_off;
temp = *(u32 *)rela->r_offset;
temp += reloc_off;
*(u32 *)rela->r_offset = temp;
debug_cond(verbose, "New:Rela r_offset:\t0x%x\n", rela->r_offset);
debug_cond(verbose, "New:Rela r_addend:\t0x%x\n", rela->r_addend);
debug_cond(verbose, "New:Value at r_offset:\t0x%x\n", temp);
break;
case R_MICROBLAZE_32:
case R_MICROBLAZE_GLOB_DAT:
debug_cond(verbose, "Type:\t(32/GLOB) %u\n", type);
debug_cond(verbose, "Rela r_offset:\t\t0x%x\n", rela->r_offset);
debug_cond(verbose, "Rela r_info:\t\t0x%x\n", rela->r_info);
debug_cond(verbose, "Rela r_addend:\t\t0x%x\n", rela->r_addend);
debug_cond(verbose, "Value at r_offset:\t0x%x\n", temp);
rela->r_offset += reloc_off;
temp = *(u32 *)rela->r_offset;
temp += reloc_off;
*(u32 *)rela->r_offset = temp;
debug_cond(verbose, "New:Rela r_offset:\t0x%x\n", rela->r_offset);
debug_cond(verbose, "New:Value at r_offset:\t0x%x\n", temp);
break;
case R_MICROBLAZE_NONE:
debug_cond(verbose, "R_MICROBLAZE_NONE - skip\n");
break;
default:
debug_cond(verbose, "warning: unsupported relocation type %d at %x\n",
type, rela->r_offset);
}
}
}