mirror of
https://github.com/edk2-porting/linux-next.git
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873b5271f8
This adds a new category of symbols to the relocs program: symbols which are known to be relative, even though the linker emits them as absolute; this is the case for symbols that live in the linker script, which currently applies to _end. Unfortunately the previous workaround of putting _end in its own empty section was defeated by newer binutils, which remove empty sections completely. This patch also changes the symbol matching to use regular expressions instead of hardcoded C for specific patterns. This is a decidedly non-minimal patch: a modified version of the relocs program is used as part of the Syslinux build, and this is basically a backport to Linux of some of those changes; they have thus been well tested. Signed-off-by: H. Peter Anvin <hpa@zytor.com> LKML-Reference: <4AF86211.3070103@zytor.com> Acked-by: Michal Marek <mmarek@suse.cz> Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
368 lines
8.2 KiB
ArmAsm
368 lines
8.2 KiB
ArmAsm
/*
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* ld script for the x86 kernel
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*
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* Historic 32-bit version written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
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*
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* Modernisation, unification and other changes and fixes:
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* Copyright (C) 2007-2009 Sam Ravnborg <sam@ravnborg.org>
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*
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*
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* Don't define absolute symbols until and unless you know that symbol
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* value is should remain constant even if kernel image is relocated
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* at run time. Absolute symbols are not relocated. If symbol value should
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* change if kernel is relocated, make the symbol section relative and
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* put it inside the section definition.
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*/
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#ifdef CONFIG_X86_32
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#define LOAD_OFFSET __PAGE_OFFSET
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#else
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#define LOAD_OFFSET __START_KERNEL_map
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#endif
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#include <asm-generic/vmlinux.lds.h>
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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#include <asm/page_types.h>
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#include <asm/cache.h>
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#include <asm/boot.h>
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#undef i386 /* in case the preprocessor is a 32bit one */
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OUTPUT_FORMAT(CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT, CONFIG_OUTPUT_FORMAT)
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#ifdef CONFIG_X86_32
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OUTPUT_ARCH(i386)
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ENTRY(phys_startup_32)
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jiffies = jiffies_64;
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#else
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OUTPUT_ARCH(i386:x86-64)
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ENTRY(phys_startup_64)
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jiffies_64 = jiffies;
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#endif
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#if defined(CONFIG_X86_64) && defined(CONFIG_DEBUG_RODATA)
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/*
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* On 64-bit, align RODATA to 2MB so that even with CONFIG_DEBUG_RODATA
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* we retain large page mappings for boundaries spanning kernel text, rodata
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* and data sections.
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*
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* However, kernel identity mappings will have different RWX permissions
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* to the pages mapping to text and to the pages padding (which are freed) the
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* text section. Hence kernel identity mappings will be broken to smaller
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* pages. For 64-bit, kernel text and kernel identity mappings are different,
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* so we can enable protection checks that come with CONFIG_DEBUG_RODATA,
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* as well as retain 2MB large page mappings for kernel text.
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*/
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#define X64_ALIGN_DEBUG_RODATA_BEGIN . = ALIGN(HPAGE_SIZE);
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#define X64_ALIGN_DEBUG_RODATA_END \
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. = ALIGN(HPAGE_SIZE); \
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__end_rodata_hpage_align = .;
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#else
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#define X64_ALIGN_DEBUG_RODATA_BEGIN
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#define X64_ALIGN_DEBUG_RODATA_END
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#endif
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PHDRS {
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text PT_LOAD FLAGS(5); /* R_E */
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data PT_LOAD FLAGS(7); /* RWE */
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#ifdef CONFIG_X86_64
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user PT_LOAD FLAGS(5); /* R_E */
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#ifdef CONFIG_SMP
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percpu PT_LOAD FLAGS(6); /* RW_ */
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#endif
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init PT_LOAD FLAGS(7); /* RWE */
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#endif
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note PT_NOTE FLAGS(0); /* ___ */
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}
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SECTIONS
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{
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#ifdef CONFIG_X86_32
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. = LOAD_OFFSET + LOAD_PHYSICAL_ADDR;
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phys_startup_32 = startup_32 - LOAD_OFFSET;
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#else
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. = __START_KERNEL;
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phys_startup_64 = startup_64 - LOAD_OFFSET;
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#endif
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/* Text and read-only data */
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.text : AT(ADDR(.text) - LOAD_OFFSET) {
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_text = .;
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/* bootstrapping code */
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HEAD_TEXT
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#ifdef CONFIG_X86_32
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. = ALIGN(PAGE_SIZE);
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*(.text.page_aligned)
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#endif
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. = ALIGN(8);
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_stext = .;
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TEXT_TEXT
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SCHED_TEXT
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LOCK_TEXT
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KPROBES_TEXT
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IRQENTRY_TEXT
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*(.fixup)
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*(.gnu.warning)
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/* End of text section */
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_etext = .;
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} :text = 0x9090
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NOTES :text :note
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EXCEPTION_TABLE(16) :text = 0x9090
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X64_ALIGN_DEBUG_RODATA_BEGIN
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RO_DATA(PAGE_SIZE)
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X64_ALIGN_DEBUG_RODATA_END
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/* Data */
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.data : AT(ADDR(.data) - LOAD_OFFSET) {
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/* Start of data section */
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_sdata = .;
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/* init_task */
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INIT_TASK_DATA(THREAD_SIZE)
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#ifdef CONFIG_X86_32
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/* 32 bit has nosave before _edata */
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NOSAVE_DATA
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#endif
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PAGE_ALIGNED_DATA(PAGE_SIZE)
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CACHELINE_ALIGNED_DATA(L1_CACHE_BYTES)
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DATA_DATA
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CONSTRUCTORS
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/* rarely changed data like cpu maps */
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READ_MOSTLY_DATA(INTERNODE_CACHE_BYTES)
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/* End of data section */
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_edata = .;
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} :data
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#ifdef CONFIG_X86_64
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#define VSYSCALL_ADDR (-10*1024*1024)
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#define VLOAD_OFFSET (VSYSCALL_ADDR - __vsyscall_0 + LOAD_OFFSET)
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#define VLOAD(x) (ADDR(x) - VLOAD_OFFSET)
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#define VVIRT_OFFSET (VSYSCALL_ADDR - __vsyscall_0)
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#define VVIRT(x) (ADDR(x) - VVIRT_OFFSET)
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. = ALIGN(4096);
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__vsyscall_0 = .;
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. = VSYSCALL_ADDR;
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.vsyscall_0 : AT(VLOAD(.vsyscall_0)) {
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*(.vsyscall_0)
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} :user
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. = ALIGN(L1_CACHE_BYTES);
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.vsyscall_fn : AT(VLOAD(.vsyscall_fn)) {
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*(.vsyscall_fn)
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}
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. = ALIGN(L1_CACHE_BYTES);
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.vsyscall_gtod_data : AT(VLOAD(.vsyscall_gtod_data)) {
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*(.vsyscall_gtod_data)
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}
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vsyscall_gtod_data = VVIRT(.vsyscall_gtod_data);
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.vsyscall_clock : AT(VLOAD(.vsyscall_clock)) {
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*(.vsyscall_clock)
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}
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vsyscall_clock = VVIRT(.vsyscall_clock);
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.vsyscall_1 ADDR(.vsyscall_0) + 1024: AT(VLOAD(.vsyscall_1)) {
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*(.vsyscall_1)
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}
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.vsyscall_2 ADDR(.vsyscall_0) + 2048: AT(VLOAD(.vsyscall_2)) {
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*(.vsyscall_2)
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}
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.vgetcpu_mode : AT(VLOAD(.vgetcpu_mode)) {
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*(.vgetcpu_mode)
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}
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vgetcpu_mode = VVIRT(.vgetcpu_mode);
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. = ALIGN(L1_CACHE_BYTES);
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.jiffies : AT(VLOAD(.jiffies)) {
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*(.jiffies)
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}
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jiffies = VVIRT(.jiffies);
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.vsyscall_3 ADDR(.vsyscall_0) + 3072: AT(VLOAD(.vsyscall_3)) {
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*(.vsyscall_3)
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}
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. = __vsyscall_0 + PAGE_SIZE;
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#undef VSYSCALL_ADDR
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#undef VLOAD_OFFSET
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#undef VLOAD
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#undef VVIRT_OFFSET
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#undef VVIRT
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#endif /* CONFIG_X86_64 */
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/* Init code and data - will be freed after init */
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. = ALIGN(PAGE_SIZE);
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.init.begin : AT(ADDR(.init.begin) - LOAD_OFFSET) {
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__init_begin = .; /* paired with __init_end */
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}
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#if defined(CONFIG_X86_64) && defined(CONFIG_SMP)
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/*
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* percpu offsets are zero-based on SMP. PERCPU_VADDR() changes the
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* output PHDR, so the next output section - .init.text - should
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* start another segment - init.
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*/
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PERCPU_VADDR(0, :percpu)
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#endif
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INIT_TEXT_SECTION(PAGE_SIZE)
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#ifdef CONFIG_X86_64
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:init
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#endif
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INIT_DATA_SECTION(16)
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.x86_cpu_dev.init : AT(ADDR(.x86_cpu_dev.init) - LOAD_OFFSET) {
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__x86_cpu_dev_start = .;
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*(.x86_cpu_dev.init)
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__x86_cpu_dev_end = .;
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}
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. = ALIGN(8);
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.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
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__parainstructions = .;
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*(.parainstructions)
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__parainstructions_end = .;
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}
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. = ALIGN(8);
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.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
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__alt_instructions = .;
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*(.altinstructions)
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__alt_instructions_end = .;
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}
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.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
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*(.altinstr_replacement)
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}
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/*
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* .exit.text is discard at runtime, not link time, to deal with
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* references from .altinstructions and .eh_frame
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*/
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.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) {
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EXIT_TEXT
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}
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.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) {
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EXIT_DATA
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}
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#if !defined(CONFIG_X86_64) || !defined(CONFIG_SMP)
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PERCPU(PAGE_SIZE)
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#endif
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. = ALIGN(PAGE_SIZE);
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/* freed after init ends here */
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.init.end : AT(ADDR(.init.end) - LOAD_OFFSET) {
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__init_end = .;
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}
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/*
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* smp_locks might be freed after init
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* start/end must be page aligned
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*/
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. = ALIGN(PAGE_SIZE);
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.smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
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__smp_locks = .;
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*(.smp_locks)
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__smp_locks_end = .;
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. = ALIGN(PAGE_SIZE);
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}
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#ifdef CONFIG_X86_64
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.data_nosave : AT(ADDR(.data_nosave) - LOAD_OFFSET) {
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NOSAVE_DATA
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}
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#endif
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/* BSS */
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. = ALIGN(PAGE_SIZE);
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.bss : AT(ADDR(.bss) - LOAD_OFFSET) {
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__bss_start = .;
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*(.bss.page_aligned)
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*(.bss)
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. = ALIGN(4);
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__bss_stop = .;
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}
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. = ALIGN(PAGE_SIZE);
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.brk : AT(ADDR(.brk) - LOAD_OFFSET) {
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__brk_base = .;
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. += 64 * 1024; /* 64k alignment slop space */
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*(.brk_reservation) /* areas brk users have reserved */
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__brk_limit = .;
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}
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_end = .;
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STABS_DEBUG
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DWARF_DEBUG
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/* Sections to be discarded */
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DISCARDS
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/DISCARD/ : { *(.eh_frame) }
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}
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#ifdef CONFIG_X86_32
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/*
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* The ASSERT() sink to . is intentional, for binutils 2.14 compatibility:
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*/
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. = ASSERT((_end - LOAD_OFFSET <= KERNEL_IMAGE_SIZE),
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"kernel image bigger than KERNEL_IMAGE_SIZE");
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#else
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/*
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* Per-cpu symbols which need to be offset from __per_cpu_load
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* for the boot processor.
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*/
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#define INIT_PER_CPU(x) init_per_cpu__##x = per_cpu__##x + __per_cpu_load
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INIT_PER_CPU(gdt_page);
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INIT_PER_CPU(irq_stack_union);
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/*
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* Build-time check on the image size:
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*/
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. = ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
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"kernel image bigger than KERNEL_IMAGE_SIZE");
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#ifdef CONFIG_SMP
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. = ASSERT((per_cpu__irq_stack_union == 0),
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"irq_stack_union is not at start of per-cpu area");
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#endif
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#endif /* CONFIG_X86_32 */
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#ifdef CONFIG_KEXEC
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#include <asm/kexec.h>
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. = ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,
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"kexec control code size is too big");
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#endif
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