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135 lines
3.7 KiB
135 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. |
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*/ |
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#include <common.h> |
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#include <elf.h> |
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#include <asm-generic/sections.h> |
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extern ulong __image_copy_start; |
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extern ulong __ivt_start; |
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extern ulong __ivt_end; |
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extern ulong __text_end; |
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DECLARE_GLOBAL_DATA_PTR; |
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int copy_uboot_to_ram(void) |
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{ |
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size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start; |
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if (gd->flags & GD_FLG_SKIP_RELOC) |
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return 0; |
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memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len); |
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return 0; |
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} |
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int clear_bss(void) |
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{ |
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ulong dst_addr = (ulong)&__bss_start + gd->reloc_off; |
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size_t len = (size_t)&__bss_end - (size_t)&__bss_start; |
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memset((void *)dst_addr, 0x00, len); |
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return 0; |
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} |
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/* |
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* Base functionality is taken from x86 version with added ARC-specifics |
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*/ |
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int do_elf_reloc_fixups(void) |
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{ |
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Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start); |
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Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end); |
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if (gd->flags & GD_FLG_SKIP_RELOC) |
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return 0; |
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debug("Section .rela.dyn is located at %08x-%08x\n", |
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(unsigned int)re_src, (unsigned int)re_end); |
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Elf32_Addr *offset_ptr_rom; |
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Elf32_Addr *offset_ptr_ram; |
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do { |
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/* Get the location from the relocation entry */ |
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offset_ptr_rom = (Elf32_Addr *)re_src->r_offset; |
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/* Check that the location of the relocation is in .text */ |
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if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start && |
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offset_ptr_rom < (Elf32_Addr *)&__image_copy_end) { |
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unsigned int val, do_swap = 0; |
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/* Switch to the in-RAM version */ |
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offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom + |
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gd->reloc_off); |
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#ifdef __LITTLE_ENDIAN__ |
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/* If location in ".text" section swap value */ |
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if (((u32)offset_ptr_rom >= (u32)&__text_start && |
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(u32)offset_ptr_rom <= (u32)&__text_end) |
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#if defined(__ARC700__) || defined(__ARC600__) |
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|| ((u32)offset_ptr_rom >= (u32)&__ivt_start && |
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(u32)offset_ptr_rom <= (u32)&__ivt_end) |
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#endif |
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) |
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do_swap = 1; |
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#endif |
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debug("Patching value @ %08x (relocated to %08x)%s\n", |
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(unsigned int)offset_ptr_rom, |
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(unsigned int)offset_ptr_ram, |
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do_swap ? ", middle-endian encoded" : ""); |
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/* |
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* Use "memcpy" because target location might be |
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* 16-bit aligned on ARC so we may need to read |
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* byte-by-byte. On attempt to read entire word by |
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* CPU throws an exception |
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*/ |
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memcpy(&val, offset_ptr_ram, sizeof(int)); |
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if (do_swap) |
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val = (val << 16) | (val >> 16); |
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/* Check that the target points into executable */ |
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if (val < (unsigned int)&__image_copy_start || |
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val > (unsigned int)&__image_copy_end) { |
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/* TODO: Use panic() instead of debug() |
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* |
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* For some reason GCC might generate |
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* fake relocation even for LD/SC of constant |
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* inderectly. See an example below: |
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* ----------------------->8-------------------- |
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* static int setup_mon_len(void) |
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* { |
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* gd->mon_len = (ulong)&__bss_end - CONFIG_SYS_MONITOR_BASE; |
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* return 0; |
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* } |
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* ----------------------->8-------------------- |
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* |
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* And that's what we get in the binary: |
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* ----------------------->8-------------------- |
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* 10005cb4 <setup_mon_len>: |
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* 10005cb4: 193c 3f80 0003 2f80 st 0x32f80,[r25,60] |
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* 10005cb8: R_ARC_RELATIVE *ABS*-0x10000000 |
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* 10005cbc: 7fe0 j_s.d [blink] |
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* 10005cbe: 700c mov_s r0,0 |
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* ----------------------->8-------------------- |
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*/ |
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debug("Relocation target %08x points outside of image\n", |
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val); |
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} |
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val += gd->reloc_off; |
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if (do_swap) |
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val = (val << 16) | (val >> 16); |
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memcpy(offset_ptr_ram, &val, sizeof(int)); |
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} |
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} while (++re_src < re_end); |
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return 0; |
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}
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