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e05d4cd9b8
RELR as a relocation packing format for relative relocations for reducing the size of relative relocation records. In a position independent executable there are often many relative relocation records, and our vmlinux is a PIE. The LLD linker (since 17.0.0) and the BFD linker (since 2.43) supports packing the relocations in the RELR format for LoongArch, with the flag -z pack-relative-relocs. Commits5cf896fb6b("arm64: Add support for relocating the kernel with RELR relocations") andccb2d173b9("Makefile: use -z pack-relative-relocs") have already added the framework to use RELR. We just need to wire it up and process the RELR relocation records in relocate_relative() in addition to the RELA relocation records. A ".p2align 3" directive is added to la_abs macro or the BFD linker cannot pack the relocation records against the .la_abs section (the ". = ALIGN(8);" directive in vmlinux.lds.S is too late in the linking process). With defconfig and CONFIG_RELR vmlinux.efi is 2.1 MiB (6%) smaller, and vmlinuz.efi (using gzip compression) is 384 KiB (2.8%) smaller. Link: https://groups.google.com/d/topic/generic-abi/bX460iggiKg Link: https://reviews.llvm.org/D138135#4531389 Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=d89ecf33ab6d Signed-off-by: Xi Ruoyao <xry111@xry111.site> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
51 lines
1.1 KiB
C
51 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _LOONGARCH_SETUP_H
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#define _LOONGARCH_SETUP_H
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#include <linux/types.h>
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#include <asm/sections.h>
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#include <uapi/asm/setup.h>
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#define VECSIZE 0x200
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extern unsigned long eentry;
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extern unsigned long tlbrentry;
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extern char init_command_line[COMMAND_LINE_SIZE];
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extern void tlb_init(int cpu);
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extern void cpu_cache_init(void);
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extern void cache_error_setup(void);
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extern void per_cpu_trap_init(int cpu);
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extern void set_handler(unsigned long offset, void *addr, unsigned long len);
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extern void set_merr_handler(unsigned long offset, void *addr, unsigned long len);
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#ifdef CONFIG_RELOCATABLE
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struct rela_la_abs {
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long pc;
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long symvalue;
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};
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extern long __la_abs_begin;
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extern long __la_abs_end;
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extern long __rela_dyn_begin;
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extern long __rela_dyn_end;
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#ifdef CONFIG_RELR
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extern long __relr_dyn_begin;
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extern long __relr_dyn_end;
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#endif
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extern unsigned long __init relocate_kernel(void);
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#endif
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static inline unsigned long kaslr_offset(void)
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{
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return (unsigned long)&_text - VMLINUX_LOAD_ADDRESS;
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}
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#endif /* __SETUP_H */
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