Commit e8aff71c authored by Tiezhu Yang's avatar Tiezhu Yang Committed by Huacai Chen
Browse files

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 e52ec98c ("objtool/powerpc:
Enable objtool to be built on ppc").

Co-developed-by: default avatarJinyang He <hejinyang@loongson.cn>
Signed-off-by: default avatarJinyang He <hejinyang@loongson.cn>
Co-developed-by: default avatarYouling Tang <tangyouling@loongson.cn>
Signed-off-by: default avatarYouling Tang <tangyouling@loongson.cn>
Signed-off-by: default avatarTiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: default avatarHuacai Chen <chenhuacai@loongson.cn>
parent e8f897f4

tools/objtool/arch/loongarch/Build

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objtool-y += decode.o

objtool-y += special.o

tools/objtool/arch/loongarch/decode.c

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// SPDX-License-Identifier: GPL-2.0-or-later

#include <string.h>

#include <objtool/check.h>



int arch_ftrace_match(char *name)

{

	return !strcmp(name, "_mcount");

}



unsigned long arch_jump_destination(struct instruction *insn)

{

	return insn->offset + (insn->immediate << 2);

}



unsigned long arch_dest_reloc_offset(int addend)

{

	return addend;

}



bool arch_pc_relative_reloc(struct reloc *reloc)

{

	return false;

}



bool arch_callee_saved_reg(unsigned char reg)

{

	switch (reg) {

	case CFI_RA:

	case CFI_FP:

	case CFI_S0 ... CFI_S8:

		return true;

	default:

		return false;

	}

}



int arch_decode_hint_reg(u8 sp_reg, int *base)

{

	return 0;

}



int arch_decode_instruction(struct objtool_file *file, const struct section *sec,

			    unsigned long offset, unsigned int maxlen,

			    struct instruction *insn)

{

	return 0;

}



const char *arch_nop_insn(int len)

{

	return NULL;

}



const char *arch_ret_insn(int len)

{

	return NULL;

}



void arch_initial_func_cfi_state(struct cfi_init_state *state)

{

	int i;



	for (i = 0; i < CFI_NUM_REGS; i++) {

		state->regs[i].base = CFI_UNDEFINED;

		state->regs[i].offset = 0;

	}



	/* initial CFA (call frame address) */

	state->cfa.base = CFI_SP;

	state->cfa.offset = 0;

}

tools/objtool/arch/loongarch/include/arch/cfi_regs.h

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/* SPDX-License-Identifier: GPL-2.0-or-later */

#ifndef _OBJTOOL_ARCH_CFI_REGS_H

#define _OBJTOOL_ARCH_CFI_REGS_H



#define CFI_RA		1

#define CFI_SP		3

#define CFI_A0		4

#define CFI_FP		22

#define CFI_S0		23

#define CFI_S1		24

#define CFI_S2		25

#define CFI_S3		26

#define CFI_S4		27

#define CFI_S5		28

#define CFI_S6		29

#define CFI_S7		30

#define CFI_S8		31

#define CFI_NUM_REGS	32



#define CFI_BP		CFI_FP



#endif /* _OBJTOOL_ARCH_CFI_REGS_H */

tools/objtool/arch/loongarch/include/arch/elf.h

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/* SPDX-License-Identifier: GPL-2.0-or-later */

#ifndef _OBJTOOL_ARCH_ELF_H

#define _OBJTOOL_ARCH_ELF_H



/*

 * See the following link for more info about ELF Relocation types:

 * https://loongson.github.io/LoongArch-Documentation/LoongArch-ELF-ABI-EN.html#_relocations

 */

#ifndef R_LARCH_NONE

#define R_LARCH_NONE		0

#endif

#ifndef R_LARCH_32

#define R_LARCH_32		1

#endif

#ifndef R_LARCH_64

#define R_LARCH_64		2

#endif

#ifndef R_LARCH_32_PCREL

#define R_LARCH_32_PCREL	99

#endif



#define R_NONE			R_LARCH_NONE

#define R_ABS32			R_LARCH_32

#define R_ABS64			R_LARCH_64

#define R_DATA32		R_LARCH_32_PCREL

#define R_DATA64		R_LARCH_32_PCREL

#define R_TEXT32		R_LARCH_32_PCREL

#define R_TEXT64		R_LARCH_32_PCREL



#endif /* _OBJTOOL_ARCH_ELF_H */

tools/objtool/arch/loongarch/include/arch/special.h

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/* SPDX-License-Identifier: GPL-2.0-or-later */

#ifndef _OBJTOOL_ARCH_SPECIAL_H

#define _OBJTOOL_ARCH_SPECIAL_H



/*

 * See more info about struct exception_table_entry

 * in arch/loongarch/include/asm/extable.h

 */

#define EX_ENTRY_SIZE		12

#define EX_ORIG_OFFSET		0

#define EX_NEW_OFFSET		4



/*

 * See more info about struct jump_entry

 * in include/linux/jump_label.h

 */

#define JUMP_ENTRY_SIZE		16

#define JUMP_ORIG_OFFSET	0

#define JUMP_NEW_OFFSET		4

#define JUMP_KEY_OFFSET		8



/*

 * See more info about struct alt_instr

 * in arch/loongarch/include/asm/alternative.h

 */

#define ALT_ENTRY_SIZE		12

#define ALT_ORIG_OFFSET		0

#define ALT_NEW_OFFSET		4

#define ALT_FEATURE_OFFSET	8

#define ALT_ORIG_LEN_OFFSET	10

#define ALT_NEW_LEN_OFFSET	11



#endif /* _OBJTOOL_ARCH_SPECIAL_H */