Messages in this thread Patch in this message | | | From | Andrea della Porta <> | Subject | [PATCH 1/4] arm64: Introduce aarch32_enabled() | Date | Wed, 18 Oct 2023 13:13:19 +0200 |
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Aarch32 bit support on 64bit kernels depends on whether CONFIG_COMPAT is selected or not. As it is a compile time option it doesn't provide the flexibility to have distributions set their own policy for Aarch32 support and give the user the flexibility to override it.
As a first step introduce aarch32_enabled() which abstracts whether 32 bit compat is turned on or off. Upcoming patches will implement the ability to set Aarch32 compat state at boot time.
Signed-off-by: Andrea della Porta <andrea.porta@suse.com> --- arch/arm64/include/asm/compat.h | 12 ++++++++++++ arch/arm64/kernel/entry-common.c | 2 ++ 2 files changed, 14 insertions(+)
diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h index ae904a1ad529..f5ef71bd0024 100644 --- a/arch/arm64/include/asm/compat.h +++ b/arch/arm64/include/asm/compat.h @@ -98,6 +98,13 @@ static inline int is_compat_thread(struct thread_info *thread) long compat_arm_syscall(struct pt_regs *regs, int scno); +extern bool __aarch32_enabled; + +static inline bool aarch32_enabled(void) +{ + return __aarch32_enabled; +} + #else /* !CONFIG_COMPAT */ static inline int is_compat_thread(struct thread_info *thread) @@ -105,5 +112,10 @@ static inline int is_compat_thread(struct thread_info *thread) return 0; } +static inline bool aarch32_enabled(void) +{ + return false; +} + #endif /* CONFIG_COMPAT */ #endif /* __ASM_COMPAT_H */ diff --git a/arch/arm64/kernel/entry-common.c b/arch/arm64/kernel/entry-common.c index 0fc94207e69a..69ff9b8c0bde 100644 --- a/arch/arm64/kernel/entry-common.c +++ b/arch/arm64/kernel/entry-common.c @@ -877,6 +877,8 @@ asmlinkage void noinstr el0t_32_error_handler(struct pt_regs *regs) { __el0_error_handler_common(regs); } + +bool __aarch32_enabled __ro_after_init = true; #else /* CONFIG_COMPAT */ UNHANDLED(el0t, 32, sync) UNHANDLED(el0t, 32, irq) -- 2.35.3
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