blob: 853ae5a948915151d6d701ef5e7ee02dd66bb9af [file] [log] [blame]
Chris Zankelc978b522016-08-10 18:36:44 +03001/*
2 * (C) Copyright 2008 - 2013 Tensilica, Inc.
3 * (C) Copyright 2014 - 2016 Cadence Design Systems Inc.
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <config.h>
9#include <asm/ldscript.h>
10#include <asm/arch/core.h>
11#include <asm/addrspace.h>
12#include <asm-offsets.h>
13
14OUTPUT_ARCH(xtensa)
15ENTRY(_start)
16
17/*
18 * U-Boot resets from SYSROM and unpacks itself from a ROM store to RAM.
19 * The reset vector is usually near the base of SYSROM and has room
20 * above it for the ROM store into which the rest of U-Boot is packed.
21 * The ROM store also needs to be above any other vectors that are in ROM.
22 * If a core has its vectors near the top of ROM, this must be edited.
23 *
24 * Note that to run C code out of ROM, the processor would have to support
25 * 'relocatable' exception vectors and provide a scratch memory for the
26 * initial stack. Not all Xtensa processor configurations support that, so
27 * we can simplify the boot process and unpack U-Boot to RAM immediately.
28 * This, however, requires that memory have been initialized throug some
29 * other means (serial ROM, for example) or are initialized early (requiring
30 * an assembler function. See start.S for more details)
31 */
32
33SECTIONS
34{
35 . = + SIZEOF_HEADERS;
36 SECTION_ResetVector(XCHAL_RESET_VECTOR_VADDR, LMA_EQ_VMA)
37
38 .reloc_table ALIGN(4) : FOLLOWING(.ResetVector.text)
39 {
40 __reloc_table_start = ABSOLUTE(.);
41#if XCHAL_HAVE_WINDOWED
42 RELOCATE2(WindowVectors,text);
43#endif
44 RELOCATE2(KernelExceptionVector,literal);
45 RELOCATE2(KernelExceptionVector,text);
46 RELOCATE2(UserExceptionVector,literal);
47 RELOCATE2(UserExceptionVector,text);
48 RELOCATE2(DoubleExceptionVector,literal);
49 RELOCATE2(DoubleExceptionVector,text);
50 RELOCATE1(text);
51 RELOCATE1(rodata);
52 RELOCATE1(data);
53 RELOCATE1(u_boot_list);
54 __reloc_table_end = ABSOLUTE(.);
55 }
56
57#if XCHAL_HAVE_WINDOWED
58 SECTION_VECTOR(WindowVectors,text,XCHAL_WINDOW_VECTORS_VADDR,
59 FOLLOWING(.reloc_table))
60 SECTION_VECTOR(KernelExceptionVector,literal,XCHAL_KERNEL_VECTOR_VADDR-8,
61 FOLLOWING(.WindowVectors.text))
62#else
63 SECTION_VECTOR(KernelExceptionVector,literal,XCHAL_KERNEL_VECTOR_VADDR-8,
64 FOLLOWING(.reloc_table))
65#endif
66 SECTION_VECTOR(KernelExceptionVector,text,XCHAL_KERNEL_VECTOR_VADDR,
67 FOLLOWING(.KernelExceptionVector.literal))
68 SECTION_VECTOR(UserExceptionVector,literal,XCHAL_USER_VECTOR_VADDR-8,
69 FOLLOWING(.KernelExceptionVector.text))
70 SECTION_VECTOR(UserExceptionVector,text,XCHAL_USER_VECTOR_VADDR,
71 FOLLOWING(.UserExceptionVector.literal))
72 SECTION_VECTOR(DoubleExceptionVector,literal,XCHAL_DOUBLEEXC_VECTOR_VADDR-8,
73 FOLLOWING(.UserExceptionVector.text))
74 SECTION_VECTOR(DoubleExceptionVector,text,XCHAL_DOUBLEEXC_VECTOR_VADDR,
75 FOLLOWING(.DoubleExceptionVector.literal))
76
77 __monitor_start = CONFIG_SYS_TEXT_ADDR;
78
79 SECTION_text(CONFIG_SYS_TEXT_ADDR, FOLLOWING(.DoubleExceptionVector.text))
80 SECTION_rodata(ALIGN(16), FOLLOWING(.text))
81 SECTION_u_boot_list(ALIGN(16), FOLLOWING(.rodata))
82 SECTION_data(ALIGN(16), FOLLOWING(.u_boot_list))
83
84 __reloc_end = .;
85 __init_end = .;
86
87 SECTION_bss(__init_end (OVERLAY),)
88
89 __monitor_end = .;
90
91 /*
92 * On many Xtensa boards a region of RAM may be mapped to the ROM address
93 * space to facilitate on-chip-debug, and U-Boot must fit with that region.
94 * The config variables CONFIG_SYS_MONITOR_* define the region.
95 * If U-Boot extends beyond this region it will appear discontiguous in the
96 * address space and is in danger of overwriting itself during unpacking
97 * ("relocation").
98 * This causes U-Boot to crash in a way that is difficult to debug. On some
99 * boards (such as xtav60) the region is small enough that U-Boot will not
100 * fit if compiled entirely with -O0 (a common scenario). To avoid a lengthy
101 * debugging session when this happens, ensure a link-time error occurs.
102 *
103 */
104
105 ASSERT(__monitor_end - __monitor_start <= CONFIG_SYS_MONITOR_LEN,
106 "U-Boot ROM image is too large. Check optimization level.")
107
108 SECTION_xtensa
109 SECTION_debug
110
111 /DISCARD/ : { *(.dynstr*) }
112 /DISCARD/ : { *(.hash*) }
113 /DISCARD/ : { *(.interp) }
114 /DISCARD/ : { *(.got*) }
115 /DISCARD/ : { *(.dynsym) }
116}