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x86: Clean up current_stack_pointer 

There's no good reason for it to be a macro, and x86_64 will want to
use it, so it should be in a header.

Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
This commit is contained in:
Andy Lutomirski 2014-11-13 15:57:07 -08:00
parent 9592747538
commit 83653c16da
2 changed files with 14 additions and 10 deletions
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11
arch/x86/include/asm/thread_info.h
View File

@ -170,6 +170,17 @@ static inline struct thread_info *current_thread_info(void)
return ti;
}
static inline unsigned long current_stack_pointer(void)
{
unsigned long sp;
#ifdef CONFIG_X86_64
asm("mov %%rsp,%0" : "=g" (sp));
#else
asm("mov %%esp,%0" : "=g" (sp));
#endif
return sp;
}
#else /* !__ASSEMBLY__ */
/* how to get the thread information struct from ASM */

13
arch/x86/kernel/irq_32.c
View File

@ -69,16 +69,9 @@ static void call_on_stack(void *func, void *stack)
: "memory", "cc", "edx", "ecx", "eax");
}
/* how to get the current stack pointer from C */
#define current_stack_pointer ({ \
unsigned long sp; \
asm("mov %%esp,%0" : "=g" (sp)); \
sp; \
})
static inline void *current_stack(void)
{
return (void *)(current_stack_pointer & ~(THREAD_SIZE - 1));
return (void *)(current_stack_pointer() & ~(THREAD_SIZE - 1));
}
static inline int
@ -103,7 +96,7 @@ execute_on_irq_stack(int overflow, struct irq_desc *desc, int irq)
/* Save the next esp at the bottom of the stack */
prev_esp = (u32 *)irqstk;
*prev_esp = current_stack_pointer;
*prev_esp = current_stack_pointer();
if (unlikely(overflow))
call_on_stack(print_stack_overflow, isp);
@ -156,7 +149,7 @@ void do_softirq_own_stack(void)
/* Push the previous esp onto the stack */
prev_esp = (u32 *)irqstk;
*prev_esp = current_stack_pointer;
*prev_esp = current_stack_pointer();
call_on_stack(__do_softirq, isp);
}