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cb8a2ef084
The kernel CONFIG_UNWINDER_ORC option enables the ORC unwinder, which is similar in concept to a DWARF unwinder. The difference is that the format of the ORC data is much simpler than DWARF, which in turn allows the ORC unwinder to be much simpler and faster. The ORC data consists of unwind tables which are generated by objtool. After analyzing all the code paths of a .o file, it determines information about the stack state at each instruction address in the file and outputs that information to the .orc_unwind and .orc_unwind_ip sections. The per-object ORC sections are combined at link time and are sorted and post-processed at boot time. The unwinder uses the resulting data to correlate instruction addresses with their stack states at run time. Most of the logic are similar with x86, in order to get ra info before ra is saved into stack, add ra_reg and ra_offset into orc_entry. At the same time, modify some arch-specific code to silence the objtool warnings. Co-developed-by: Jinyang He <hejinyang@loongson.cn> Signed-off-by: Jinyang He <hejinyang@loongson.cn> Co-developed-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
168 lines
2.9 KiB
ArmAsm
168 lines
2.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/sizes.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/orc_lookup.h>
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#define PAGE_SIZE _PAGE_SIZE
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#define RO_EXCEPTION_TABLE_ALIGN 4
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/*
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* Put .bss..swapper_pg_dir as the first thing in .bss. This will
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* ensure that it has .bss alignment (64K).
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*/
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#define BSS_FIRST_SECTIONS *(.bss..swapper_pg_dir)
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#include <asm-generic/vmlinux.lds.h>
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#include "image-vars.h"
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/*
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* Max avaliable Page Size is 64K, so we set SectionAlignment
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* field of EFI application to 64K.
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*/
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PECOFF_FILE_ALIGN = 0x200;
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PECOFF_SEGMENT_ALIGN = 0x10000;
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OUTPUT_ARCH(loongarch)
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ENTRY(kernel_entry)
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PHDRS {
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text PT_LOAD FLAGS(7); /* RWX */
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note PT_NOTE FLAGS(4); /* R__ */
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}
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jiffies = jiffies_64;
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SECTIONS
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{
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. = VMLINUX_LOAD_ADDRESS;
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_text = .;
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HEAD_TEXT_SECTION
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. = ALIGN(PECOFF_SEGMENT_ALIGN);
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_stext = .;
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.text : {
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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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SOFTIRQENTRY_TEXT
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*(.fixup)
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*(.gnu.warning)
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} :text = 0
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. = ALIGN(PECOFF_SEGMENT_ALIGN);
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_etext = .;
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. = ALIGN(PECOFF_SEGMENT_ALIGN);
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__init_begin = .;
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__inittext_begin = .;
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INIT_TEXT_SECTION(PAGE_SIZE)
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.exit.text : {
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EXIT_TEXT
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}
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. = ALIGN(PECOFF_SEGMENT_ALIGN);
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__inittext_end = .;
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__initdata_begin = .;
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/*
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* struct alt_inst entries. From the header (alternative.h):
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* "Alternative instructions for different CPU types or capabilities"
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* Think locking instructions on spinlocks.
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*/
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. = ALIGN(4);
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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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INIT_DATA_SECTION(16)
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.exit.data : {
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EXIT_DATA
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}
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#ifdef CONFIG_SMP
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PERCPU_SECTION(1 << CONFIG_L1_CACHE_SHIFT)
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#endif
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.init.bss : {
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*(.init.bss)
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}
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. = ALIGN(PECOFF_SEGMENT_ALIGN);
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__initdata_end = .;
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__init_end = .;
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_sdata = .;
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RO_DATA(4096)
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.got : ALIGN(16) { *(.got) }
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.plt : ALIGN(16) { *(.plt) }
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.got.plt : ALIGN(16) { *(.got.plt) }
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RW_DATA(1 << CONFIG_L1_CACHE_SHIFT, PAGE_SIZE, THREAD_SIZE)
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.rela.dyn : ALIGN(8) {
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__rela_dyn_begin = .;
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*(.rela.dyn) *(.rela*)
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__rela_dyn_end = .;
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}
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.data.rel : { *(.data.rel*) }
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#ifdef CONFIG_RELOCATABLE
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. = ALIGN(8);
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.la_abs : AT(ADDR(.la_abs) - LOAD_OFFSET) {
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__la_abs_begin = .;
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*(.la_abs)
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__la_abs_end = .;
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}
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#endif
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ORC_UNWIND_TABLE
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.sdata : {
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*(.sdata)
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}
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.edata_padding : { BYTE(0); . = ALIGN(PECOFF_FILE_ALIGN); }
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_edata = .;
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BSS_SECTION(0, SZ_64K, 8)
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. = ALIGN(PECOFF_SEGMENT_ALIGN);
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_end = .;
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STABS_DEBUG
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DWARF_DEBUG
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ELF_DETAILS
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#ifdef CONFIG_EFI_STUB
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/* header symbols */
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_kernel_asize = _end - _text;
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_kernel_fsize = _edata - _text;
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_kernel_vsize = _end - __initdata_begin;
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_kernel_rsize = _edata - __initdata_begin;
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#endif
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.gptab.sdata : {
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*(.gptab.data)
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*(.gptab.sdata)
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}
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.gptab.sbss : {
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*(.gptab.bss)
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*(.gptab.sbss)
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}
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DISCARDS
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/DISCARD/ : {
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*(.dynamic .dynsym .dynstr .hash .gnu.hash)
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*(.gnu.attributes)
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*(.options)
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*(.eh_frame)
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}
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}
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