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alpha: Implement "current_stack_pointer"

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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@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: "Alexander A. Klimov" <grandmaster@al2klimov.de>
Cc: linux-alpha@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Kees Cook 2022-02-23 22:05:58 -08:00 committed by Matt Turner
parent d7cf43edeb
commit bd1912de89
3 changed files with 4 additions and 1 deletions
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1
arch/alpha/Kconfig
View File

@ -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

2
arch/alpha/include/asm/thread_info.h
View File

@ -41,6 +41,8 @@ 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. */

2
arch/alpha/lib/stacktrace.c
View File

@ -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 {