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Date: Wed, 23 Feb 2022 22:05:58 -0800 From: Kees Cook <keescook@...omium.org> To: Richard Henderson <rth@...ddle.net> Cc: Kees Cook <keescook@...omium.org>, Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner <mattst88@...il.com>, Geert Uytterhoeven <geert@...ux-m68k.org>, Andrew Morton <akpm@...ux-foundation.org>, Mike Rapoport <rppt@...nel.org>, Mark Rutland <mark.rutland@....com>, "Peter Zijlstra (Intel)" <peterz@...radead.org>, Kefeng Wang <wangkefeng.wang@...wei.com>, "Alexander A. Klimov" <grandmaster@...klimov.de>, linux-alpha@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] alpha: Implement "current_stack_pointer" To follow the existing per-arch conventions replace open-coded use of asm "$30" as "current_stack_pointer". This will let it be used in non-arch places (like HARDENED_USERCOPY). Cc: Richard Henderson <rth@...ddle.net> Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru> Cc: Matt Turner <mattst88@...il.com> Cc: Geert Uytterhoeven <geert@...ux-m68k.org> Cc: Andrew Morton <akpm@...ux-foundation.org> Cc: Mike Rapoport <rppt@...nel.org> Cc: Mark Rutland <mark.rutland@....com> Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org> Cc: Kefeng Wang <wangkefeng.wang@...wei.com> Cc: "Alexander A. Klimov" <grandmaster@...klimov.de> Cc: linux-alpha@...r.kernel.org Signed-off-by: Kees Cook <keescook@...omium.org> --- arch/alpha/Kconfig | 1 + arch/alpha/include/asm/thread_info.h | 2 ++ arch/alpha/lib/stacktrace.c | 2 +- 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index 4e87783c90ad..31f3dbcdc28c 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -3,6 +3,7 @@ config ALPHA bool default y select ARCH_32BIT_USTAT_F_TINODE + select ARCH_HAS_CURRENT_STACK_POINTER select ARCH_MIGHT_HAVE_PC_PARPORT select ARCH_MIGHT_HAVE_PC_SERIO select ARCH_NO_PREEMPT diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h index 2592356e3215..28214db31053 100644 --- a/arch/alpha/include/asm/thread_info.h +++ b/arch/alpha/include/asm/thread_info.h @@ -43,6 +43,8 @@ struct thread_info { register struct thread_info *__current_thread_info __asm__("$8"); #define current_thread_info() __current_thread_info +register unsigned long *current_stack_pointer __asm__ ("$30"); + #endif /* __ASSEMBLY__ */ /* Thread information allocation. */ diff --git a/arch/alpha/lib/stacktrace.c b/arch/alpha/lib/stacktrace.c index 62454a7810e2..2b1176dd5174 100644 --- a/arch/alpha/lib/stacktrace.c +++ b/arch/alpha/lib/stacktrace.c @@ -92,7 +92,7 @@ stacktrace(void) { instr * ret_pc; instr * prologue = (instr *)stacktrace; - register unsigned char * sp __asm__ ("$30"); + unsigned char *sp = (unsigned char *)current_stack_pointer; printk("\tstack trace:\n"); do { -- 2.30.2
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