diff options
| author | Behan Webster <behanw@converseincode.com> | 2012-11-14 12:55:28 +0100 |
|---|---|---|
| committer | Behan Webster <behanw@converseincode.com> | 2014-03-31 00:07:19 -0700 |
| commit | d8423926186223a7596226c06c048671ecef1aac (patch) | |
| tree | c42d02ed632f0e24df5b860ace47cb70b45b470e /arch/x86 | |
| parent | b894633e7b00bcdb3e320b7ff0b995a08749441b (diff) | |
x86: LLVMLinux: Reimplement current_stack_pointer without register usage.
Use asm to make the globally named register work again for gcc and clang.
Much more efficient than copying the stack pointer to a variable and back again.
Signed-off-by: Behan Webster <behanw@converseincode.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/include/asm/thread_info.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index e1940c06ed0..e27ccc17c7d 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -163,10 +163,10 @@ struct thread_info { */ #ifndef __ASSEMBLY__ -#define current_stack_pointer ({ \ - unsigned long sp; \ - asm("mov %%esp,%0" : "=g" (sp)); \ - sp; \ +#define current_stack_pointer ({ \ + register unsigned long sp asm("esp") __used; \ + asm("" : "=r" (sp)); \ + sp; \ }) /* how to get the thread information struct from C */ |