78f3cdfa2a
Fix resembles implementation from Marc Gauthier and Piet Denaly:
In the Xtensa architecture, assembly generates literals which must always
precede the code (the L32R instruction that loads them only uses negative
PC-relative offsets). For any *.text section, literals are placed in a
corresponding *.literal section. The linker script (vmlinux.lds) must
place these in the correct order. It must also combine them, when the
*.text section can be larger than L32R's 256 kB range.
For example, this doesn't work: *(.literal) *(.text) because L32R
instructions at the end of .text can't reach the literals.
The linker can solve this if they are combined in parentheses, like this:
*(.literal .text)
because it is now allowed mix literals in .text to bring them in range.
None of this is done by standard vmlinux.lds.h macros such as TEXT_TEXT
and INIT_TEXT. To avoid replicating the logic of that header file, we
instead post-process the generated linker script to convert *(xxx.text)
to *(xxx.literal xxx.text) for the following text sections:
.text .ref.text .*init.text .*exit.text .text.*
using a sed script. To do this we must override the default rule for
vmlinux.lds (see scripts/Makefile.build and the top-level Makefile)
to insert this extra step.
Signed-off-by: Marc Gauthier <marc@tensilica.com>
Signed-off-by: Pete Delaney <piet@tensilica.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
325 lines
7.7 KiB
ArmAsm
325 lines
7.7 KiB
ArmAsm
/*
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* arch/xtensa/kernel/vmlinux.lds.S
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*
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* Xtensa linker script
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 - 2005 Tensilica Inc.
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*
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* Chris Zankel <chris@zankel.net>
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* Marc Gauthier <marc@tensilica.com, marc@alumni.uwaterloo.ca>
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* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
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*/
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#include <asm-generic/vmlinux.lds.h>
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#include <variant/core.h>
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#include <platform/hardware.h>
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OUTPUT_ARCH(xtensa)
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ENTRY(_start)
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#ifdef __XTENSA_EB__
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jiffies = jiffies_64 + 4;
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#else
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jiffies = jiffies_64;
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#endif
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#ifndef KERNELOFFSET
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#define KERNELOFFSET 0xd0001000
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#endif
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/* Note: In the following macros, it would be nice to specify only the
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vector name and section kind and construct "sym" and "section" using
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CPP concatenation, but that does not work reliably. Concatenating a
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string with "." produces an invalid token. CPP will not print a
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warning because it thinks this is an assembly file, but it leaves
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them as multiple tokens and there may or may not be whitespace
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between them. */
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/* Macro for a relocation entry */
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#define RELOCATE_ENTRY(sym, section) \
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LONG(sym ## _start); \
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LONG(sym ## _end); \
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LONG(LOADADDR(section))
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/* Macro to define a section for a vector.
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*
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* Use of the MIN function catches the types of errors illustrated in
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* the following example:
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*
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* Assume the section .DoubleExceptionVector.literal is completely
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* full. Then a programmer adds code to .DoubleExceptionVector.text
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* that produces another literal. The final literal position will
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* overlay onto the first word of the adjacent code section
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* .DoubleExceptionVector.text. (In practice, the literals will
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* overwrite the code, and the first few instructions will be
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* garbage.)
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*/
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#define SECTION_VECTOR(sym, section, addr, max_prevsec_size, prevsec) \
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section addr : AT((MIN(LOADADDR(prevsec) + max_prevsec_size, \
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LOADADDR(prevsec) + SIZEOF(prevsec)) + 3) & ~ 3) \
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{ \
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. = ALIGN(4); \
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sym ## _start = ABSOLUTE(.); \
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*(section) \
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sym ## _end = ABSOLUTE(.); \
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}
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/*
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* Mapping of input sections to output sections when linking.
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*/
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SECTIONS
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{
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. = KERNELOFFSET;
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/* .text section */
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_text = .;
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_stext = .;
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_ftext = .;
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.text :
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{
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/* The HEAD_TEXT section must be the first section! */
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HEAD_TEXT
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TEXT_TEXT
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VMLINUX_SYMBOL(__sched_text_start) = .;
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*(.sched.literal .sched.text)
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VMLINUX_SYMBOL(__sched_text_end) = .;
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VMLINUX_SYMBOL(__lock_text_start) = .;
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*(.spinlock.literal .spinlock.text)
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VMLINUX_SYMBOL(__lock_text_end) = .;
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}
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_etext = .;
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PROVIDE (etext = .);
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. = ALIGN(16);
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RODATA
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/* Relocation table */
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.fixup : { *(.fixup) }
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. = ALIGN(16);
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__ex_table : {
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__start___ex_table = .;
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*(__ex_table)
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__stop___ex_table = .;
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}
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/* Data section */
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. = ALIGN(XCHAL_ICACHE_LINESIZE);
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_fdata = .;
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.data :
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{
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DATA_DATA
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CONSTRUCTORS
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. = ALIGN(XCHAL_ICACHE_LINESIZE);
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*(.data.cacheline_aligned)
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}
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_edata = .;
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/* The initial task */
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. = ALIGN(8192);
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.data.init_task : { *(.data.init_task) }
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/* Initialization code and data: */
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. = ALIGN(1 << 12);
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__init_begin = .;
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.init.text : {
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_sinittext = .;
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INIT_TEXT
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_einittext = .;
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}
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.init.data :
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{
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INIT_DATA
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. = ALIGN(0x4);
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__tagtable_begin = .;
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*(.taglist)
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__tagtable_end = .;
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. = ALIGN(16);
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__boot_reloc_table_start = ABSOLUTE(.);
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RELOCATE_ENTRY(_WindowVectors_text,
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.WindowVectors.text);
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RELOCATE_ENTRY(_KernelExceptionVector_text,
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.KernelExceptionVector.text);
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RELOCATE_ENTRY(_UserExceptionVector_text,
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.UserExceptionVector.text);
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RELOCATE_ENTRY(_DoubleExceptionVector_literal,
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.DoubleExceptionVector.literal);
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RELOCATE_ENTRY(_DoubleExceptionVector_text,
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.DoubleExceptionVector.text);
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RELOCATE_ENTRY(_DebugInterruptVector_text,
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.DebugInterruptVector.text);
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__boot_reloc_table_end = ABSOLUTE(.) ;
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}
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. = ALIGN(XCHAL_ICACHE_LINESIZE);
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__setup_start = .;
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.init.setup : { *(.init.setup) }
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__setup_end = .;
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__initcall_start = .;
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.initcall.init : {
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INITCALLS
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}
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__initcall_end = .;
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__con_initcall_start = .;
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.con_initcall.init : { *(.con_initcall.init) }
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__con_initcall_end = .;
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SECURITY_INIT
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#ifdef CONFIG_BLK_DEV_INITRD
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. = ALIGN(4096);
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__initramfs_start =.;
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.init.ramfs : { *(.init.ramfs) }
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__initramfs_end = .;
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#endif
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PERCPU(4096)
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/* We need this dummy segment here */
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. = ALIGN(4);
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.dummy : { LONG(0) }
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/* The vectors are relocated to the real position at startup time */
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SECTION_VECTOR (_WindowVectors_text,
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.WindowVectors.text,
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XCHAL_WINDOW_VECTORS_VADDR, 4,
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.dummy)
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SECTION_VECTOR (_DebugInterruptVector_literal,
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.DebugInterruptVector.literal,
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XCHAL_DEBUG_VECTOR_VADDR - 4,
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SIZEOF(.WindowVectors.text),
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.WindowVectors.text)
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SECTION_VECTOR (_DebugInterruptVector_text,
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.DebugInterruptVector.text,
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XCHAL_DEBUG_VECTOR_VADDR,
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4,
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.DebugInterruptVector.literal)
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SECTION_VECTOR (_KernelExceptionVector_literal,
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.KernelExceptionVector.literal,
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XCHAL_KERNEL_VECTOR_VADDR - 4,
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SIZEOF(.DebugInterruptVector.text),
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.DebugInterruptVector.text)
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SECTION_VECTOR (_KernelExceptionVector_text,
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.KernelExceptionVector.text,
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XCHAL_KERNEL_VECTOR_VADDR,
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4,
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.KernelExceptionVector.literal)
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SECTION_VECTOR (_UserExceptionVector_literal,
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.UserExceptionVector.literal,
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XCHAL_USER_VECTOR_VADDR - 4,
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SIZEOF(.KernelExceptionVector.text),
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.KernelExceptionVector.text)
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SECTION_VECTOR (_UserExceptionVector_text,
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.UserExceptionVector.text,
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XCHAL_USER_VECTOR_VADDR,
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4,
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.UserExceptionVector.literal)
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SECTION_VECTOR (_DoubleExceptionVector_literal,
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.DoubleExceptionVector.literal,
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XCHAL_DOUBLEEXC_VECTOR_VADDR - 16,
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SIZEOF(.UserExceptionVector.text),
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.UserExceptionVector.text)
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SECTION_VECTOR (_DoubleExceptionVector_text,
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.DoubleExceptionVector.text,
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XCHAL_DOUBLEEXC_VECTOR_VADDR,
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32,
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.DoubleExceptionVector.literal)
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. = (LOADADDR( .DoubleExceptionVector.text ) + SIZEOF( .DoubleExceptionVector.text ) + 3) & ~ 3;
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. = ALIGN(1 << 12);
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__init_end = .;
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. = ALIGN(8192);
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/* BSS section */
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_bss_start = .;
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.bss : { *(.bss.page_aligned) *(.bss) }
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_bss_end = .;
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_end = .;
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/* only used by the boot loader */
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. = ALIGN(0x10);
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.bootstrap : { *(.bootstrap.literal .bootstrap.text .bootstrap.data) }
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. = ALIGN(0x1000);
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__initrd_start = .;
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.initrd : { *(.initrd) }
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__initrd_end = .;
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.ResetVector.text XCHAL_RESET_VECTOR_VADDR :
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{
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*(.ResetVector.text)
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}
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/* Sections to be discarded */
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/DISCARD/ :
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{
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*(.exit.literal)
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EXIT_TEXT
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EXIT_DATA
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*(.exitcall.exit)
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}
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.xt.lit : { *(.xt.lit) }
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.xt.prop : { *(.xt.prop) }
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.debug 0 : { *(.debug) }
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.line 0 : { *(.line) }
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.debug_srcinfo 0 : { *(.debug_srcinfo) }
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.debug_sfnames 0 : { *(.debug_sfnames) }
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.debug_aranges 0 : { *(.debug_aranges) }
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.debug_pubnames 0 : { *(.debug_pubnames) }
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.debug_info 0 : { *(.debug_info) }
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.debug_abbrev 0 : { *(.debug_abbrev) }
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.debug_line 0 : { *(.debug_line) }
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.debug_frame 0 : { *(.debug_frame) }
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.debug_str 0 : { *(.debug_str) }
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.debug_loc 0 : { *(.debug_loc) }
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.debug_macinfo 0 : { *(.debug_macinfo) }
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.debug_weaknames 0 : { *(.debug_weaknames) }
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.debug_funcnames 0 : { *(.debug_funcnames) }
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.debug_typenames 0 : { *(.debug_typenames) }
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.debug_varnames 0 : { *(.debug_varnames) }
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.xt.insn 0 :
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{
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*(.xt.insn)
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*(.gnu.linkonce.x*)
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}
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.xt.lit 0 :
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{
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*(.xt.lit)
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*(.gnu.linkonce.p*)
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}
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}
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