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c978b524 CZ |
1 | /* |
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 | ||
14 | OUTPUT_ARCH(xtensa) | |
15 | ENTRY(_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 | ||
33 | SECTIONS | |
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 | ||
10117a29 | 77 | __monitor_start = XTENSA_SYS_TEXT_ADDR; |
c978b524 | 78 | |
10117a29 | 79 | SECTION_text(XTENSA_SYS_TEXT_ADDR, FOLLOWING(.DoubleExceptionVector.text)) |
c978b524 CZ |
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 | } |