Commit c984aef8 authored by Sathvika Vasireddy's avatar Sathvika Vasireddy Committed by Michael Ellerman
Browse files

objtool/powerpc: Add --mcount specific implementation 



This patch enables objtool --mcount on powerpc, and adds implementation
specific to powerpc.

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>
Reviewed-by: default avatarChristophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: default avatarJosh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: default avatarSathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221114175754.1131267-17-sv@linux.ibm.com
parent e52ec98c

arch/powerpc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -239,6 +239,7 @@ config PPC 
	select HAVE_NMI				if PERF_EVENTS || (PPC64 && PPC_BOOK3S)

	select HAVE_OPTPROBES

	select HAVE_OBJTOOL			if PPC32 || MPROFILE_KERNEL

	select HAVE_OBJTOOL_MCOUNT		if HAVE_OBJTOOL

	select HAVE_PERF_EVENTS

	select HAVE_PERF_EVENTS_NMI		if PPC64

	select HAVE_PERF_REGS

tools/objtool/arch/powerpc/decode.c

+16 −0
Original line number Diff line number Diff line
@@ -9,6 +9,11 @@ 
#include <objtool/builtin.h>

#include <objtool/endianness.h>



int arch_ftrace_match(char *name)

{

	return !strcmp(name, "_mcount");

}



unsigned long arch_dest_reloc_offset(int addend)

{

	return addend;
@@ -50,6 +55,17 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec 
	typ = INSN_OTHER;

	imm = 0;



	switch (opcode) {

	case 18: /* b[l][a] */

		if ((insn & 3) == 1) /* bl */

			typ = INSN_CALL;



		imm = insn & 0x3fffffc;

		if (imm & 0x2000000)

			imm -= 0x4000000;

		break;

	}



	if (opcode == 1)

		*len = 8;

	else

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

+2 −0
Original line number Diff line number Diff line
@@ -4,5 +4,7 @@ 
#define _OBJTOOL_ARCH_ELF



#define R_NONE R_PPC_NONE

#define R_ABS64 R_PPC64_ADDR64

#define R_ABS32 R_PPC_ADDR32



#endif /* _OBJTOOL_ARCH_ELF */