| #ifndef __ASM_SYSTEM_H |
| #define __ASM_SYSTEM_H |
| |
| #include <asm/segment.h> |
| #include <asm/cmpxchg.h> |
| |
| #ifdef __KERNEL__ |
| |
| /* entries in ARCH_DLINFO: */ |
| #ifdef CONFIG_IA32_EMULATION |
| # define AT_VECTOR_SIZE_ARCH 2 |
| #else |
| # define AT_VECTOR_SIZE_ARCH 1 |
| #endif |
| |
| #define __SAVE(reg,offset) "movq %%" #reg ",(14-" #offset ")*8(%%rsp)\n\t" |
| #define __RESTORE(reg,offset) "movq (14-" #offset ")*8(%%rsp),%%" #reg "\n\t" |
| |
| /* frame pointer must be last for get_wchan */ |
| #define SAVE_CONTEXT "pushf ; pushq %%rbp ; movq %%rsi,%%rbp\n\t" |
| #define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp ; popf\t" |
| |
| #define __EXTRA_CLOBBER \ |
| ,"rcx","rbx","rdx","r8","r9","r10","r11","r12","r13","r14","r15" |
| |
| /* Save restore flags to clear handle leaking NT */ |
| #define switch_to(prev,next,last) \ |
| asm volatile(SAVE_CONTEXT \ |
| "movq %%rsp,%P[threadrsp](%[prev])\n\t" /* save RSP */ \ |
| "movq %P[threadrsp](%[next]),%%rsp\n\t" /* restore RSP */ \ |
| "call __switch_to\n\t" \ |
| ".globl thread_return\n" \ |
| "thread_return:\n\t" \ |
| "movq %%gs:%P[pda_pcurrent],%%rsi\n\t" \ |
| "movq %P[thread_info](%%rsi),%%r8\n\t" \ |
| LOCK_PREFIX "btr %[tif_fork],%P[ti_flags](%%r8)\n\t" \ |
| "movq %%rax,%%rdi\n\t" \ |
| "jc ret_from_fork\n\t" \ |
| RESTORE_CONTEXT \ |
| : "=a" (last) \ |
| : [next] "S" (next), [prev] "D" (prev), \ |
| [threadrsp] "i" (offsetof(struct task_struct, thread.sp)), \ |
| [ti_flags] "i" (offsetof(struct thread_info, flags)),\ |
| [tif_fork] "i" (TIF_FORK), \ |
| [thread_info] "i" (offsetof(struct task_struct, stack)), \ |
| [pda_pcurrent] "i" (offsetof(struct x8664_pda, pcurrent)) \ |
| : "memory", "cc" __EXTRA_CLOBBER) |
| |
| #endif /* __KERNEL__ */ |
| |
| static inline unsigned long read_cr8(void) |
| { |
| unsigned long cr8; |
| asm volatile("movq %%cr8,%0" : "=r" (cr8)); |
| return cr8; |
| } |
| |
| static inline void write_cr8(unsigned long val) |
| { |
| asm volatile("movq %0,%%cr8" :: "r" (val) : "memory"); |
| } |
| |
| #include <linux/irqflags.h> |
| |
| #endif |