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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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>
115 lines
2.7 KiB
C
115 lines
2.7 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 _ASM_MODULE_H
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#define _ASM_MODULE_H
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#include <asm/inst.h>
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#include <asm/orc_types.h>
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#include <asm-generic/module.h>
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#define RELA_STACK_DEPTH 16
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struct mod_section {
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int shndx;
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int num_entries;
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int max_entries;
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};
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struct mod_arch_specific {
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struct mod_section got;
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struct mod_section plt;
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struct mod_section plt_idx;
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#ifdef CONFIG_UNWINDER_ORC
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unsigned int num_orcs;
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int *orc_unwind_ip;
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struct orc_entry *orc_unwind;
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#endif
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/* For CONFIG_DYNAMIC_FTRACE */
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struct plt_entry *ftrace_trampolines;
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};
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struct got_entry {
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Elf_Addr symbol_addr;
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};
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struct plt_entry {
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u32 inst_lu12iw;
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u32 inst_lu32id;
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u32 inst_lu52id;
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u32 inst_jirl;
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};
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struct plt_idx_entry {
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Elf_Addr symbol_addr;
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};
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Elf_Addr module_emit_got_entry(struct module *mod, Elf_Shdr *sechdrs, Elf_Addr val);
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Elf_Addr module_emit_plt_entry(struct module *mod, Elf_Shdr *sechdrs, Elf_Addr val);
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static inline struct got_entry emit_got_entry(Elf_Addr val)
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{
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return (struct got_entry) { val };
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}
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static inline struct plt_entry emit_plt_entry(unsigned long val)
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{
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u32 lu12iw, lu32id, lu52id, jirl;
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lu12iw = larch_insn_gen_lu12iw(LOONGARCH_GPR_T1, ADDR_IMM(val, LU12IW));
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lu32id = larch_insn_gen_lu32id(LOONGARCH_GPR_T1, ADDR_IMM(val, LU32ID));
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lu52id = larch_insn_gen_lu52id(LOONGARCH_GPR_T1, LOONGARCH_GPR_T1, ADDR_IMM(val, LU52ID));
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jirl = larch_insn_gen_jirl(0, LOONGARCH_GPR_T1, ADDR_IMM(val, ORI));
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return (struct plt_entry) { lu12iw, lu32id, lu52id, jirl };
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}
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static inline struct plt_idx_entry emit_plt_idx_entry(unsigned long val)
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{
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return (struct plt_idx_entry) { val };
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}
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static inline int get_plt_idx(unsigned long val, Elf_Shdr *sechdrs, const struct mod_section *sec)
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{
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int i;
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struct plt_idx_entry *plt_idx = (struct plt_idx_entry *)sechdrs[sec->shndx].sh_addr;
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for (i = 0; i < sec->num_entries; i++) {
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if (plt_idx[i].symbol_addr == val)
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return i;
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}
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return -1;
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}
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static inline struct plt_entry *get_plt_entry(unsigned long val,
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Elf_Shdr *sechdrs,
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const struct mod_section *sec_plt,
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const struct mod_section *sec_plt_idx)
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{
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int plt_idx = get_plt_idx(val, sechdrs, sec_plt_idx);
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struct plt_entry *plt = (struct plt_entry *)sechdrs[sec_plt->shndx].sh_addr;
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if (plt_idx < 0)
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return NULL;
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return plt + plt_idx;
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}
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static inline struct got_entry *get_got_entry(Elf_Addr val,
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Elf_Shdr *sechdrs,
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const struct mod_section *sec)
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{
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int i;
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struct got_entry *got = (struct got_entry *)sechdrs[sec->shndx].sh_addr;
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for (i = 0; i < sec->num_entries; i++)
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if (got[i].symbol_addr == val)
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return &got[i];
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return NULL;
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}
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#endif /* _ASM_MODULE_H */
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