Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
objtool/LoongArch: Enable objtool to be built
Add the minimal changes to enable objtool build on LoongArch,
most of the functions are stubs to only fix the build errors
when make -C tools/objtool.
This is similar with commit e52ec98c5ab1 ("objtool/powerpc:
Enable objtool to be built on ppc").
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>
authored by
Tiezhu Yang
and committed by
Huacai Chen
e8aff71c
e8f897f4
+173
+71
tools/objtool/arch/loongarch/decode.c
+71
tools/objtool/arch/loongarch/decode.c
···
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <string.h>
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#include <objtool/check.h>
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int arch_ftrace_match(char *name)
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{
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return !strcmp(name, "_mcount");
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}
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unsigned long arch_jump_destination(struct instruction *insn)
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{
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return insn->offset + (insn->immediate << 2);
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}
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+
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unsigned long arch_dest_reloc_offset(int addend)
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{
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return addend;
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}
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bool arch_pc_relative_reloc(struct reloc *reloc)
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{
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return false;
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}
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+
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bool arch_callee_saved_reg(unsigned char reg)
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{
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switch (reg) {
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case CFI_RA:
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case CFI_FP:
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case CFI_S0 ... CFI_S8:
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return true;
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default:
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return false;
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}
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}
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int arch_decode_hint_reg(u8 sp_reg, int *base)
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{
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return 0;
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}
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int arch_decode_instruction(struct objtool_file *file, const struct section *sec,
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unsigned long offset, unsigned int maxlen,
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struct instruction *insn)
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{
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return 0;
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}
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const char *arch_nop_insn(int len)
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{
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return NULL;
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}
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const char *arch_ret_insn(int len)
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{
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return NULL;
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}
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void arch_initial_func_cfi_state(struct cfi_init_state *state)
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{
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int i;
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for (i = 0; i < CFI_NUM_REGS; i++) {
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state->regs[i].base = CFI_UNDEFINED;
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state->regs[i].offset = 0;
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}
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/* initial CFA (call frame address) */
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state->cfa.base = CFI_SP;
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state->cfa.offset = 0;
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}
+22
tools/objtool/arch/loongarch/include/arch/cfi_regs.h
+22
tools/objtool/arch/loongarch/include/arch/cfi_regs.h
···
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _OBJTOOL_ARCH_CFI_REGS_H
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#define _OBJTOOL_ARCH_CFI_REGS_H
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#define CFI_RA 1
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#define CFI_SP 3
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#define CFI_A0 4
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#define CFI_FP 22
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#define CFI_S0 23
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#define CFI_S1 24
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#define CFI_S2 25
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#define CFI_S3 26
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#define CFI_S4 27
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#define CFI_S5 28
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#define CFI_S6 29
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#define CFI_S7 30
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#define CFI_S8 31
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#define CFI_NUM_REGS 32
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#define CFI_BP CFI_FP
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#endif /* _OBJTOOL_ARCH_CFI_REGS_H */
+30
tools/objtool/arch/loongarch/include/arch/elf.h
+30
tools/objtool/arch/loongarch/include/arch/elf.h
···
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _OBJTOOL_ARCH_ELF_H
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#define _OBJTOOL_ARCH_ELF_H
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/*
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* See the following link for more info about ELF Relocation types:
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* https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_relocations
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*/
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#ifndef R_LARCH_NONE
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#define R_LARCH_NONE 0
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#endif
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#ifndef R_LARCH_32
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#define R_LARCH_32 1
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#endif
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#ifndef R_LARCH_64
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#define R_LARCH_64 2
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#endif
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#ifndef R_LARCH_32_PCREL
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#define R_LARCH_32_PCREL 99
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#endif
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#define R_NONE R_LARCH_NONE
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#define R_ABS32 R_LARCH_32
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#define R_ABS64 R_LARCH_64
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#define R_DATA32 R_LARCH_32_PCREL
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#define R_DATA64 R_LARCH_32_PCREL
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#define R_TEXT32 R_LARCH_32_PCREL
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#define R_TEXT64 R_LARCH_32_PCREL
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#endif /* _OBJTOOL_ARCH_ELF_H */
+33
tools/objtool/arch/loongarch/include/arch/special.h
+33
tools/objtool/arch/loongarch/include/arch/special.h
···
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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#ifndef _OBJTOOL_ARCH_SPECIAL_H
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#define _OBJTOOL_ARCH_SPECIAL_H
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/*
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* See more info about struct exception_table_entry
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* in arch/loongarch/include/asm/extable.h
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*/
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#define EX_ENTRY_SIZE 12
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#define EX_ORIG_OFFSET 0
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#define EX_NEW_OFFSET 4
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/*
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* See more info about struct jump_entry
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* in include/linux/jump_label.h
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*/
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#define JUMP_ENTRY_SIZE 16
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#define JUMP_ORIG_OFFSET 0
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#define JUMP_NEW_OFFSET 4
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#define JUMP_KEY_OFFSET 8
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/*
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* See more info about struct alt_instr
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* in arch/loongarch/include/asm/alternative.h
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*/
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#define ALT_ENTRY_SIZE 12
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#define ALT_ORIG_OFFSET 0
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#define ALT_NEW_OFFSET 4
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#define ALT_FEATURE_OFFSET 8
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#define ALT_ORIG_LEN_OFFSET 10
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#define ALT_NEW_LEN_OFFSET 11
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#endif /* _OBJTOOL_ARCH_SPECIAL_H */
+15
tools/objtool/arch/loongarch/special.c
+15
tools/objtool/arch/loongarch/special.c
···
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <objtool/special.h>
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bool arch_support_alt_relocation(struct special_alt *special_alt,
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struct instruction *insn,
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struct reloc *reloc)
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{
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return false;
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}
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struct reloc *arch_find_switch_table(struct objtool_file *file,
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struct instruction *insn)
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{
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return NULL;
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}