linux-kernel - [tip:perf/urgent] perf jit: genelf makes assumptions about endian

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Date:	Wed, 30 Mar 2016 23:34:00 -0700
From:	tip-bot for Anton Blanchard <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	anton@...ba.org, eranian@...gle.com, cel@...ibm.com,
	sukadev@...ux.vnet.ibm.com, mingo@...nel.org, hpa@...or.com,
	tglx@...utronix.de, mpe@...erman.id.au, acme@...hat.com,
	linux-kernel@...r.kernel.org
Subject: [tip:perf/urgent] perf jit: genelf makes assumptions about endian

Commit-ID:  9f56c092b99b40ce3cf4c6d0134ff7e513c9f1a6
Gitweb:     http://git.kernel.org/tip/9f56c092b99b40ce3cf4c6d0134ff7e513c9f1a6
Author:     Anton Blanchard <anton@...ba.org>
AuthorDate: Tue, 29 Mar 2016 17:59:44 +1100
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 30 Mar 2016 18:12:06 -0300

perf jit: genelf makes assumptions about endian

Commit 9b07e27f88b9 ("perf inject: Add jitdump mmap injection support")
incorrectly assumed that PowerPC is big endian only.

Simplify things by consolidating the define of GEN_ELF_ENDIAN and checking
for __BYTE_ORDER == __BIG_ENDIAN.

The PowerPC checks were also incorrect, they do not match what gcc
emits. We should first look for __powerpc64__, then __powerpc__.

Signed-off-by: Anton Blanchard <anton@...ba.org>
Acked-by: Michael Ellerman <mpe@...erman.id.au>
Cc: Carl Love <cel@...ibm.com>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc: linuxppc-dev@...ts.ozlabs.org
Fixes: 9b07e27f88b9 ("perf inject: Add jitdump mmap injection support")
Link: http://lkml.kernel.org/r/20160329175944.33a211cc@kryten
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/genelf.h | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/tools/perf/util/genelf.h b/tools/perf/util/genelf.h
index cd67e64..2fbeb59 100644
--- a/tools/perf/util/genelf.h
+++ b/tools/perf/util/genelf.h
@@ -9,36 +9,32 @@ int jit_add_debug_info(Elf *e, uint64_t code_addr, void *debug, int nr_debug_ent
 
 #if   defined(__arm__)
 #define GEN_ELF_ARCH	EM_ARM
-#define GEN_ELF_ENDIAN	ELFDATA2LSB
 #define GEN_ELF_CLASS	ELFCLASS32
 #elif defined(__aarch64__)
 #define GEN_ELF_ARCH	EM_AARCH64
-#define GEN_ELF_ENDIAN	ELFDATA2LSB
 #define GEN_ELF_CLASS	ELFCLASS64
 #elif defined(__x86_64__)
 #define GEN_ELF_ARCH	EM_X86_64
-#define GEN_ELF_ENDIAN	ELFDATA2LSB
 #define GEN_ELF_CLASS	ELFCLASS64
 #elif defined(__i386__)
 #define GEN_ELF_ARCH	EM_386
-#define GEN_ELF_ENDIAN	ELFDATA2LSB
 #define GEN_ELF_CLASS	ELFCLASS32
-#elif defined(__ppcle__)
-#define GEN_ELF_ARCH	EM_PPC
-#define GEN_ELF_ENDIAN	ELFDATA2LSB
-#define GEN_ELF_CLASS	ELFCLASS64
-#elif defined(__powerpc__)
-#define GEN_ELF_ARCH	EM_PPC64
-#define GEN_ELF_ENDIAN	ELFDATA2MSB
-#define GEN_ELF_CLASS	ELFCLASS64
-#elif defined(__powerpcle__)
+#elif defined(__powerpc64__)
 #define GEN_ELF_ARCH	EM_PPC64
-#define GEN_ELF_ENDIAN	ELFDATA2LSB
 #define GEN_ELF_CLASS	ELFCLASS64
+#elif defined(__powerpc__)
+#define GEN_ELF_ARCH	EM_PPC
+#define GEN_ELF_CLASS	ELFCLASS32
 #else
 #error "unsupported architecture"
 #endif
 
+#if __BYTE_ORDER == __BIG_ENDIAN
+#define GEN_ELF_ENDIAN	ELFDATA2MSB
+#else
+#define GEN_ELF_ENDIAN	ELFDATA2LSB
+#endif
+
 #if GEN_ELF_CLASS == ELFCLASS64
 #define elf_newehdr	elf64_newehdr
 #define elf_getshdr	elf64_getshdr