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csky: add arch support current_stack_pointer

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To follow the existing per-arch conventions, using "current_stack_pointer"
to set sp.

This will let it be used in non-arch places(like HARDENED_USERCOPY).

Refer to the implementation of riscv commit fdecfea093 ("riscv: Rename
"sp_in_global" to "current_stack_pointer"").

Link: https://lore.kernel.org/lkml/20220224060411.1855683-1-keescook@chromium.org/
Signed-off-by: Tong Tiangen <tongtiangen@huawei.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
This commit is contained in:
Tong Tiangen 2022-10-22 01:43:40 +00:00 committed by Guo Ren
parent 9abf2313ad
commit b203c67ebe
3 changed files with 5 additions and 4 deletions
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1
arch/csky/Kconfig
View File

@ -9,6 +9,7 @@ config CSKY
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_QUEUED_RWLOCKS
select ARCH_USE_QUEUED_SPINLOCKS
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_INLINE_READ_LOCK if !PREEMPTION
select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION

2
arch/csky/include/asm/processor.h
View File

@ -84,4 +84,6 @@ unsigned long __get_wchan(struct task_struct *p);
#define cpu_relax() barrier()
register unsigned long current_stack_pointer __asm__("sp");
#endif /* __ASM_CSKY_PROCESSOR_H */

6
arch/csky/kernel/stacktrace.c
View File

@ -23,10 +23,9 @@ void notrace walk_stackframe(struct task_struct *task, struct pt_regs *regs,
sp = user_stack_pointer(regs);
pc = instruction_pointer(regs);
} else if (task == NULL || task == current) {
const register unsigned long current_sp __asm__ ("sp");
const register unsigned long current_fp __asm__ ("r8");
fp = current_fp;
sp = current_sp;
sp = current_stack_pointer;
pc = (unsigned long)walk_stackframe;
} else {
/* task blocked in __switch_to */
@ -68,8 +67,7 @@ static void notrace walk_stackframe(struct task_struct *task,
sp = user_stack_pointer(regs);
pc = instruction_pointer(regs);
} else if (task == NULL || task == current) {
const register unsigned long current_sp __asm__ ("sp");
sp = current_sp;
sp = current_stack_pointer;
pc = (unsigned long)walk_stackframe;
} else {
/* task blocked in __switch_to */