switch_to.h File Reference

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Macros
#define	SAVE_CONTEXT   "pushf ; pushq %%rbp ; movq %%rsi,%%rbp\n\t"
#define	RESTORE_CONTEXT   "movq %%rbp,%%rsi ; popq %%rbp ; popf\t"
#define	__EXTRA_CLOBBER
#define	__switch_canary
#define	__switch_canary_oparam
#define	__switch_canary_iparam
#define	switch_to(prev, next, last)

Functions
struct task_struct *	__switch_to (struct task_struct *prev, struct task_struct *next)
void	__switch_to_xtra (struct task_struct *prev_p, struct task_struct *next_p, struct tss_struct *tss)

Macro Definition Documentation

#define __EXTRA_CLOBBER

Value:

, "rcx", "rbx", "rdx", "r8", "r9", "r10", "r11", \
      "r12", "r13", "r14", "r15"

Definition at line 85 of file switch_to.h.

#define __switch_canary

Definition at line 98 of file switch_to.h.

#define __switch_canary_iparam

Definition at line 100 of file switch_to.h.

#define __switch_canary_oparam

Definition at line 99 of file switch_to.h.

#define RESTORE_CONTEXT   "movq %%rbp,%%rsi ; popq %%rbp ; popf\t"

Definition at line 83 of file switch_to.h.

#define SAVE_CONTEXT   "pushf ; pushq %%rbp ; movq %%rsi,%%rbp\n\t"

Definition at line 82 of file switch_to.h.

#define switch_to	(		prev,
			next,
			last
	)

Value:

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"                   \
         "movq "__percpu_arg([current_task])",%%rsi\n\t"          \
         __switch_canary                          \
         "movq %P[thread_info](%%rsi),%%r8\n\t"           \
         "movq %%rax,%%rdi\n\t"                       \
         "testl  %[_tif_fork],%P[ti_flags](%%r8)\n\t"         \
         "jnz   ret_from_fork\n\t"                    \
         RESTORE_CONTEXT                          \
         : "=a" (last)                        \
           __switch_canary_oparam                     \
         : [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)),   \
           [current_task] "m" (current_task)              \
           __switch_canary_iparam                     \
         : "memory", "cc" __EXTRA_CLOBBER)

Definition at line 104 of file switch_to.h.

Function Documentation

struct task_struct* __switch_to ( struct task_struct *  prev, struct task_struct *  next  )

read

Definition at line 297 of file process.c.

void __switch_to_xtra	(	struct task_struct *	prev_p,
		struct task_struct *	next_p,
		struct tss_struct *	tss
	)

Definition at line 221 of file process.c.