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