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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 --- 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 From patchwork Thu Sep 5 23:05:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13793077 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 91951CE7AA1 for ; 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Signed-off-by: Mark Brown --- Documentation/arch/arm64/elf_hwcaps.rst | 6 +++--- arch/arm64/include/asm/cpufeature.h | 3 ++- arch/arm64/include/asm/hwcap.h | 6 +++++- arch/arm64/include/uapi/asm/hwcap.h | 4 ++++ arch/arm64/kernel/cpufeature.c | 6 ++++++ 5 files changed, 20 insertions(+), 5 deletions(-) diff --git a/Documentation/arch/arm64/elf_hwcaps.rst b/Documentation/arch/arm64/elf_hwcaps.rst index 448c1664879b..36530d613adb 100644 --- a/Documentation/arch/arm64/elf_hwcaps.rst +++ b/Documentation/arch/arm64/elf_hwcaps.rst @@ -16,9 +16,9 @@ architected discovery mechanism available to userspace code at EL0. The kernel exposes the presence of these features to userspace through a set of flags called hwcaps, exposed in the auxiliary vector. -Userspace software can test for features by acquiring the AT_HWCAP or -AT_HWCAP2 entry of the auxiliary vector, and testing whether the relevant -flags are set, e.g.:: +Userspace software can test for features by acquiring the AT_HWCAP, +AT_HWCAP2 or AT_HWCAP3 entry of the auxiliary vector, and testing +whether the relevant flags are set, e.g.:: bool floating_point_is_present(void) { diff --git a/arch/arm64/include/asm/cpufeature.h b/arch/arm64/include/asm/cpufeature.h index 558434267271..0a999a45ce02 100644 --- a/arch/arm64/include/asm/cpufeature.h +++ b/arch/arm64/include/asm/cpufeature.h @@ -12,7 +12,7 @@ #include #include -#define MAX_CPU_FEATURES 128 +#define MAX_CPU_FEATURES 192 #define cpu_feature(x) KERNEL_HWCAP_ ## x #define ARM64_SW_FEATURE_OVERRIDE_NOKASLR 0 @@ -438,6 +438,7 @@ void cpu_set_feature(unsigned int num); bool cpu_have_feature(unsigned int num); unsigned long cpu_get_elf_hwcap(void); unsigned long cpu_get_elf_hwcap2(void); +unsigned long cpu_get_elf_hwcap3(void); #define cpu_set_named_feature(name) cpu_set_feature(cpu_feature(name)) #define cpu_have_named_feature(name) cpu_have_feature(cpu_feature(name)) diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h index 4edd3b61df11..c1107456cb81 100644 --- a/arch/arm64/include/asm/hwcap.h +++ b/arch/arm64/include/asm/hwcap.h @@ -158,17 +158,21 @@ #define KERNEL_HWCAP_SME_SF8DP4 __khwcap2_feature(SME_SF8DP4) #define KERNEL_HWCAP_SME_SF8DP2 __khwcap2_feature(SME_SF8DP2) +#define __khwcap3_feature(x) (const_ilog2(HWCAP3_ ## x) + 128) + /* * This yields a mask that user programs can use to figure out what * instruction set this cpu supports. */ #define ELF_HWCAP cpu_get_elf_hwcap() #define ELF_HWCAP2 cpu_get_elf_hwcap2() +#define ELF_HWCAP3 cpu_get_elf_hwcap3() #ifdef CONFIG_COMPAT #define COMPAT_ELF_HWCAP (compat_elf_hwcap) #define COMPAT_ELF_HWCAP2 (compat_elf_hwcap2) -extern unsigned int compat_elf_hwcap, compat_elf_hwcap2; +#define COMPAT_ELF_HWCAP3 (compat_elf_hwcap3) +extern unsigned int compat_elf_hwcap, compat_elf_hwcap2, compat_elf_hwcap3; #endif enum { diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h index 285610e626f5..170eac371991 100644 --- a/arch/arm64/include/uapi/asm/hwcap.h +++ b/arch/arm64/include/uapi/asm/hwcap.h @@ -123,4 +123,8 @@ #define HWCAP2_SME_SF8DP4 (1UL << 61) #define HWCAP2_SME_SF8DP2 (1UL << 62) +/* + * HWCAP3 flags - for AT_HWCAP3 + */ + #endif /* _UAPI__ASM_HWCAP_H */ diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 646ecd3069fd..77d6a84e27e5 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -103,6 +103,7 @@ static DECLARE_BITMAP(elf_hwcap, MAX_CPU_FEATURES) __read_mostly; COMPAT_HWCAP_LPAE) unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT; unsigned int compat_elf_hwcap2 __read_mostly; +unsigned int compat_elf_hwcap3 __read_mostly; #endif DECLARE_BITMAP(system_cpucaps, ARM64_NCAPS); @@ -3476,6 +3477,11 @@ unsigned long cpu_get_elf_hwcap2(void) return elf_hwcap[1]; } +unsigned long cpu_get_elf_hwcap3(void) +{ + return elf_hwcap[2]; +} + static void __init setup_boot_cpu_capabilities(void) { /*