138 lines
3.8 KiB
C
138 lines
3.8 KiB
C
// 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 <log.h>
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#include <asm-generic/sections.h>
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#include <asm/global_data.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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