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objtool/powerpc: Add --mcount specific implementation

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

Tested-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Sathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221114175754.1131267-17-sv@linux.ibm.com
This commit is contained in:
Sathvika Vasireddy 2022-11-14 23:27:54 +05:30 committed by Michael Ellerman
parent e52ec98c5a
commit c984aef8c8
3 changed files with 19 additions and 0 deletions
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1
arch/powerpc/Kconfig
View File

@ -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

16
tools/objtool/arch/powerpc/decode.c
View File

@ -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

2
tools/objtool/arch/powerpc/include/arch/elf.h
View File

@ -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 */