Commit e52ec98c authored by Sathvika Vasireddy's avatar Sathvika Vasireddy Committed by Michael Ellerman
Browse files

objtool/powerpc: Enable objtool to be built on ppc 



This patch adds [stub] implementations for required functions, inorder
to enable objtool build on powerpc.

[Christophe Leroy: powerpc: Add missing asm/asm.h for objtool,
Use local variables for type and imm in arch_decode_instruction(),
Adapt len for prefixed instructions.]

Tested-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: default avatarJosh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: default avatarSathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221114175754.1131267-16-sv@linux.ibm.com
parent 4ca993d4

arch/powerpc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -238,6 +238,7 @@ config PPC 
	select HAVE_MOD_ARCH_SPECIFIC

	select HAVE_NMI				if PERF_EVENTS || (PPC64 && PPC_BOOK3S)

	select HAVE_OPTPROBES

	select HAVE_OBJTOOL			if PPC32 || MPROFILE_KERNEL

	select HAVE_PERF_EVENTS

	select HAVE_PERF_EVENTS_NMI		if PPC64

	select HAVE_PERF_REGS

arch/powerpc/include/asm/asm.h

0 → 100644
+7 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _ASM_POWERPC_ASM_H

#define _ASM_POWERPC_ASM_H



#define _ASM_PTR	" .long "



#endif /* _ASM_POWERPC_ASM_H */

tools/objtool/arch/powerpc/Build

0 → 100644
+2 −0
Original line number Diff line number Diff line 
objtool-y += decode.o

objtool-y += special.o

tools/objtool/arch/powerpc/decode.c

0 → 100644
+85 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-or-later



#include <stdio.h>

#include <stdlib.h>

#include <objtool/check.h>

#include <objtool/elf.h>

#include <objtool/arch.h>

#include <objtool/warn.h>

#include <objtool/builtin.h>

#include <objtool/endianness.h>



unsigned long arch_dest_reloc_offset(int addend)

{

	return addend;

}



bool arch_callee_saved_reg(unsigned char reg)

{

	return false;

}



int arch_decode_hint_reg(u8 sp_reg, int *base)

{

	exit(-1);

}



const char *arch_nop_insn(int len)

{

	exit(-1);

}



const char *arch_ret_insn(int len)

{

	exit(-1);

}



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

			    unsigned long offset, unsigned int maxlen,

			    unsigned int *len, enum insn_type *type,

			    unsigned long *immediate,

			    struct list_head *ops_list)

{

	unsigned int opcode;

	enum insn_type typ;

	unsigned long imm;

	u32 insn;



	insn = bswap_if_needed(file->elf, *(u32 *)(sec->data->d_buf + offset));

	opcode = insn >> 26;

	typ = INSN_OTHER;

	imm = 0;



	if (opcode == 1)

		*len = 8;

	else

		*len = 4;



	*type = typ;

	*immediate = imm;



	return 0;

}



unsigned long arch_jump_destination(struct instruction *insn)

{

	return insn->offset + insn->immediate;

}



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;



	/* initial LR (return address) */

	state->regs[CFI_RA].base = CFI_CFA;

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

}

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

0 → 100644
+11 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-or-later */



#ifndef _OBJTOOL_CFI_REGS_H

#define _OBJTOOL_CFI_REGS_H



#define CFI_BP 1

#define CFI_SP CFI_BP

#define CFI_RA 32

#define CFI_NUM_REGS 33



#endif