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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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200036a8e8
A 64-bit kernel built without CONFIG_MLONGCALLS (-mlong-calls compiler option) usually fails to link because of unreachable functions. Try to work around that linking issue by moving the *.init and *.exit text segments closer to the main text segment. With that change those segments now don't get freed at runtime any longer, but since we in most cases run with huge-page enabled, we ignore the lost memory in preference of better performance. This change will not guarantee that every kernel config will now sucessfully build with short calls and without linking issues. Signed-off-by: Helge Deller <deller@gmx.de>
186 lines
3.8 KiB
ArmAsm
186 lines
3.8 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/* Kernel link layout for various "sections"
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*
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* Copyright (C) 1999-2003 Matthew Wilcox <willy at parisc-linux.org>
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* Copyright (C) 2000-2003 Paul Bame <bame at parisc-linux.org>
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* Copyright (C) 2000 John Marvin <jsm at parisc-linux.org>
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* Copyright (C) 2000 Michael Ang <mang with subcarrier.org>
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* Copyright (C) 2002 Randolph Chung <tausq with parisc-linux.org>
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* Copyright (C) 2003 James Bottomley <jejb with parisc-linux.org>
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* Copyright (C) 2006-2013 Helge Deller <deller@gmx.de>
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*/
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/*
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* Put page table entries (swapper_pg_dir) as the first thing in .bss. This
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* will ensure that it has .bss alignment (PAGE_SIZE).
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*/
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#define BSS_FIRST_SECTIONS *(.data..vm0.pmd) \
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*(.data..vm0.pgd) \
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*(.data..vm0.pte)
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#include <asm-generic/vmlinux.lds.h>
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/* needed for the processor specific cache alignment size */
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#include <asm/cache.h>
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#include <asm/page.h>
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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/* ld script to make hppa Linux kernel */
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#ifndef CONFIG_64BIT
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OUTPUT_FORMAT("elf32-hppa-linux")
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OUTPUT_ARCH(hppa)
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#else
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OUTPUT_FORMAT("elf64-hppa-linux")
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OUTPUT_ARCH(hppa:hppa2.0w)
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#endif
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#define EXIT_TEXT_SECTIONS() .exit.text : { EXIT_TEXT }
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#if !defined(CONFIG_64BIT) || defined(CONFIG_MLONGCALLS)
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#define MLONGCALL_KEEP(x)
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#define MLONGCALL_DISCARD(x) x
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#else
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#define MLONGCALL_KEEP(x) x
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#define MLONGCALL_DISCARD(x)
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#endif
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ENTRY(parisc_kernel_start)
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#ifndef CONFIG_64BIT
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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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SECTIONS
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{
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. = KERNEL_BINARY_TEXT_START;
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__init_begin = .;
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HEAD_TEXT_SECTION
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MLONGCALL_DISCARD(INIT_TEXT_SECTION(8))
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. = ALIGN(PAGE_SIZE);
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INIT_DATA_SECTION(PAGE_SIZE)
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MLONGCALL_DISCARD(EXIT_TEXT_SECTIONS())
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.exit.data :
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{
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EXIT_DATA
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}
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PERCPU_SECTION(8)
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. = ALIGN(4);
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.altinstructions : {
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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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. = ALIGN(HUGEPAGE_SIZE);
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__init_end = .;
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/* freed after init ends here */
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_text = .; /* Text and read-only data */
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_stext = .;
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MLONGCALL_KEEP(INIT_TEXT_SECTION(8))
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.text ALIGN(PAGE_SIZE) : {
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TEXT_TEXT
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LOCK_TEXT
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SCHED_TEXT
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CPUIDLE_TEXT
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KPROBES_TEXT
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IRQENTRY_TEXT
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SOFTIRQENTRY_TEXT
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*(.text.do_softirq)
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*(.text.sys_exit)
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*(.text.do_sigaltstack)
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*(.text.do_fork)
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*(.text.div)
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*($$*) /* millicode routines */
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*(.text.*)
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*(.fixup)
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*(.lock.text) /* out-of-line lock text */
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*(.gnu.warning)
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}
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MLONGCALL_KEEP(EXIT_TEXT_SECTIONS())
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. = ALIGN(PAGE_SIZE);
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_etext = .;
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/* End of text section */
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/* Start of data section */
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_sdata = .;
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/* Architecturally we need to keep __gp below 0x1000000 and thus
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* in front of RO_DATA_SECTION() which stores lots of tracepoint
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* and ftrace symbols. */
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#ifdef CONFIG_64BIT
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. = ALIGN(16);
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/* Linkage tables */
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.opd : {
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__start_opd = .;
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*(.opd)
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__end_opd = .;
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} PROVIDE (__gp = .);
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.plt : {
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*(.plt)
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}
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.dlt : {
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*(.dlt)
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}
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#endif
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RO_DATA_SECTION(8)
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/* RO because of BUILDTIME_EXTABLE_SORT */
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EXCEPTION_TABLE(8)
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NOTES
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/* unwind info */
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.PARISC.unwind : {
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__start___unwind = .;
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*(.PARISC.unwind)
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__stop___unwind = .;
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}
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/* writeable */
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/* Make sure this is page aligned so
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* that we can properly leave these
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* as writable
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*/
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. = ALIGN(HUGEPAGE_SIZE);
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data_start = .;
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/* Data */
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RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, PAGE_SIZE)
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/* PA-RISC locks requires 16-byte alignment */
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. = ALIGN(16);
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.data..lock_aligned : {
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*(.data..lock_aligned)
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}
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/* End of data section */
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_edata = .;
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/* BSS */
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BSS_SECTION(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE)
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. = ALIGN(HUGEPAGE_SIZE);
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_end = . ;
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STABS_DEBUG
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.note 0 : { *(.note) }
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/* Sections to be discarded */
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DISCARDS
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/DISCARD/ : {
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#ifdef CONFIG_64BIT
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/* temporary hack until binutils is fixed to not emit these
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* for static binaries
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*/
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*(.interp)
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*(.dynsym)
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*(.dynstr)
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*(.dynamic)
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*(.hash)
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*(.gnu.hash)
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#endif
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}
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}
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