linux-kernel - [PATCH RFC 1/2] binfmt_elf: Wire up AT_HWCAP3 at AT

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Message-Id: <20240906-arm64-elf-hwcap3-v1-1-8df1a5e63508@kernel.org>
Date: Fri, 06 Sep 2024 00:05:24 +0100
From: Mark Brown <broonie@...nel.org>
To: Alexander Viro <viro@...iv.linux.org.uk>, 
 Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>, 
 Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Jonathan Corbet <corbet@....net>
Cc: linux-fsdevel@...r.kernel.org, linux-mm@...ck.org, 
 linux-kernel@...r.kernel.org, Yury Khrustalev <yury.khrustalev@....com>, 
 Wilco Dijkstra <wilco.dijkstra@....com>, 
 linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org, 
 Mark Brown <broonie@...nel.org>
Subject: [PATCH RFC 1/2] binfmt_elf: Wire up AT_HWCAP3 at AT_HWCAP4

AT_HWCAP3 and AT_HWCAP4 were recently defined for use on PowerPC in commit
3281366a8e79 ("uapi/auxvec: Define AT_HWCAP3 and AT_HWCAP4 aux vector,
entries"). Since we want to start using AT_HWCAP3 on arm64 add support for
exposing both these new hwcaps via binfmt_elf.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
 fs/binfmt_elf.c        |  6 ++++++
 fs/binfmt_elf_fdpic.c  |  6 ++++++
 fs/compat_binfmt_elf.c | 15 +++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 19fa49cd9907..32e45e65de8f 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -257,6 +257,12 @@ create_elf_tables(struct linux_binprm *bprm, const struct elfhdr *exec,
 	NEW_AUX_ENT(AT_RANDOM, (elf_addr_t)(unsigned long)u_rand_bytes);
 #ifdef ELF_HWCAP2
 	NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
+#endif
+#ifdef ELF_HWCAP3
+	NEW_AUX_ENT(AT_HWCAP3, ELF_HWCAP3);
+#endif
+#ifdef ELF_HWCAP4
+	NEW_AUX_ENT(AT_HWCAP3, ELF_HWCAP4);
 #endif
 	NEW_AUX_ENT(AT_EXECFN, bprm->exec);
 	if (k_platform) {
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 28a3439f163a..9365f48598a1 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -620,6 +620,12 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
 	NEW_AUX_ENT(AT_HWCAP,	ELF_HWCAP);
 #ifdef ELF_HWCAP2
 	NEW_AUX_ENT(AT_HWCAP2,	ELF_HWCAP2);
+#endif
+#ifdef ELF_HWCAP3
+	NEW_AUX_ENT(AT_HWCAP3,	ELF_HWCAP3);
+#endif
+#ifdef ELF_HWCAP3
+	NEW_AUX_ENT(AT_HWCAP4,	ELF_HWCAP4);
 #endif
 	NEW_AUX_ENT(AT_PAGESZ,	PAGE_SIZE);
 	NEW_AUX_ENT(AT_CLKTCK,	CLOCKS_PER_SEC);
diff --git a/fs/compat_binfmt_elf.c b/fs/compat_binfmt_elf.c
index 8f0af4f62631..0a219e26692a 100644
--- a/fs/compat_binfmt_elf.c
+++ b/fs/compat_binfmt_elf.c
@@ -80,6 +80,21 @@
 #define	ELF_HWCAP2		COMPAT_ELF_HWCAP2
 #endif
 
+#ifdef	COMPAT_ELF_HWCAP3
+#undef	ELF_HWCAP3
+#define	ELF_HWCAP3		COMPAT_ELF_HWCAP3
+#endif
+
+#ifdef	COMPAT_ELF_HWCAP3
+#undef	ELF_HWCAP3
+#define	ELF_HWCAP3		COMPAT_ELF_HWCAP3
+#endif
+
+#ifdef	COMPAT_ELF_HWCAP4
+#undef	ELF_HWCAP4
+#define	ELF_HWCAP4		COMPAT_ELF_HWCAP4
+#endif
+
 #ifdef	COMPAT_ARCH_DLINFO
 #undef	ARCH_DLINFO
 #define	ARCH_DLINFO		COMPAT_ARCH_DLINFO

-- 
2.39.2