1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
9 #include <asm-generic/sections.h>
11 extern ulong __image_copy_start;
12 extern ulong __ivt_start;
13 extern ulong __ivt_end;
14 extern ulong __text_end;
16 DECLARE_GLOBAL_DATA_PTR;
18 int copy_uboot_to_ram(void)
20 size_t len = (size_t)&__image_copy_end - (size_t)&__image_copy_start;
22 if (gd->flags & GD_FLG_SKIP_RELOC)
25 memcpy((void *)gd->relocaddr, (void *)&__image_copy_start, len);
32 ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
33 size_t len = (size_t)&__bss_end - (size_t)&__bss_start;
35 memset((void *)dst_addr, 0x00, len);
41 * Base functionality is taken from x86 version with added ARC-specifics
43 int do_elf_reloc_fixups(void)
45 Elf32_Rela *re_src = (Elf32_Rela *)(&__rel_dyn_start);
46 Elf32_Rela *re_end = (Elf32_Rela *)(&__rel_dyn_end);
48 if (gd->flags & GD_FLG_SKIP_RELOC)
51 debug("Section .rela.dyn is located at %08x-%08x\n",
52 (unsigned int)re_src, (unsigned int)re_end);
54 Elf32_Addr *offset_ptr_rom;
55 Elf32_Addr *offset_ptr_ram;
58 /* Get the location from the relocation entry */
59 offset_ptr_rom = (Elf32_Addr *)re_src->r_offset;
61 /* Check that the location of the relocation is in .text */
62 if (offset_ptr_rom >= (Elf32_Addr *)&__image_copy_start &&
63 offset_ptr_rom < (Elf32_Addr *)&__image_copy_end) {
64 unsigned int val, do_swap = 0;
65 /* Switch to the in-RAM version */
66 offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
69 #ifdef __LITTLE_ENDIAN__
70 /* If location in ".text" section swap value */
71 if (((u32)offset_ptr_rom >= (u32)&__text_start &&
72 (u32)offset_ptr_rom <= (u32)&__text_end)
73 #if defined(__ARC700__) || defined(__ARC600__)
74 || ((u32)offset_ptr_rom >= (u32)&__ivt_start &&
75 (u32)offset_ptr_rom <= (u32)&__ivt_end)
81 debug("Patching value @ %08x (relocated to %08x)%s\n",
82 (unsigned int)offset_ptr_rom,
83 (unsigned int)offset_ptr_ram,
84 do_swap ? ", middle-endian encoded" : "");
87 * Use "memcpy" because target location might be
88 * 16-bit aligned on ARC so we may need to read
89 * byte-by-byte. On attempt to read entire word by
90 * CPU throws an exception
92 memcpy(&val, offset_ptr_ram, sizeof(int));
95 val = (val << 16) | (val >> 16);
97 /* Check that the target points into executable */
98 if (val < (unsigned int)&__image_copy_start ||
99 val > (unsigned int)&__image_copy_end) {
100 /* TODO: Use panic() instead of debug()
102 * For some reason GCC might generate
103 * fake relocation even for LD/SC of constant
104 * inderectly. See an example below:
105 * ----------------------->8--------------------
106 * static int setup_mon_len(void)
108 * gd->mon_len = (ulong)&__bss_end - CONFIG_SYS_MONITOR_BASE;
111 * ----------------------->8--------------------
113 * And that's what we get in the binary:
114 * ----------------------->8--------------------
115 * 10005cb4 <setup_mon_len>:
116 * 10005cb4: 193c 3f80 0003 2f80 st 0x32f80,[r25,60]
117 * 10005cb8: R_ARC_RELATIVE *ABS*-0x10000000
118 * 10005cbc: 7fe0 j_s.d [blink]
119 * 10005cbe: 700c mov_s r0,0
120 * ----------------------->8--------------------
122 debug("Relocation target %08x points outside of image\n",
126 val += gd->reloc_off;
129 val = (val << 16) | (val >> 16);
131 memcpy(offset_ptr_ram, &val, sizeof(int));
133 } while (++re_src < re_end);