2 * Copyright IBM Corp. 1999, 2009
4 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
7 #ifndef __ASM_SWITCH_TO_H
8 #define __ASM_SWITCH_TO_H
10 #include <linux/thread_info.h>
11 #include <asm/ptrace.h>
13 extern struct task_struct *__switch_to(void *, void *);
14 extern void update_cr_regs(struct task_struct *task);
16 static inline int test_fp_ctl(u32 fpc)
21 if (!MACHINE_HAS_IEEE)
31 : "=d" (rc), "=d" (orig_fpc)
32 : "d" (fpc), "0" (-EINVAL));
36 static inline void save_fp_ctl(u32 *fpc)
38 if (!MACHINE_HAS_IEEE)
46 static inline int restore_fp_ctl(u32 *fpc)
50 if (!MACHINE_HAS_IEEE)
58 : "=d" (rc) : "Q" (*fpc), "0" (-EINVAL));
62 static inline void save_fp_regs(freg_t *fprs)
64 asm volatile("std 0,%0" : "=Q" (fprs[0]));
65 asm volatile("std 2,%0" : "=Q" (fprs[2]));
66 asm volatile("std 4,%0" : "=Q" (fprs[4]));
67 asm volatile("std 6,%0" : "=Q" (fprs[6]));
68 if (!MACHINE_HAS_IEEE)
70 asm volatile("std 1,%0" : "=Q" (fprs[1]));
71 asm volatile("std 3,%0" : "=Q" (fprs[3]));
72 asm volatile("std 5,%0" : "=Q" (fprs[5]));
73 asm volatile("std 7,%0" : "=Q" (fprs[7]));
74 asm volatile("std 8,%0" : "=Q" (fprs[8]));
75 asm volatile("std 9,%0" : "=Q" (fprs[9]));
76 asm volatile("std 10,%0" : "=Q" (fprs[10]));
77 asm volatile("std 11,%0" : "=Q" (fprs[11]));
78 asm volatile("std 12,%0" : "=Q" (fprs[12]));
79 asm volatile("std 13,%0" : "=Q" (fprs[13]));
80 asm volatile("std 14,%0" : "=Q" (fprs[14]));
81 asm volatile("std 15,%0" : "=Q" (fprs[15]));
84 static inline void restore_fp_regs(freg_t *fprs)
86 asm volatile("ld 0,%0" : : "Q" (fprs[0]));
87 asm volatile("ld 2,%0" : : "Q" (fprs[2]));
88 asm volatile("ld 4,%0" : : "Q" (fprs[4]));
89 asm volatile("ld 6,%0" : : "Q" (fprs[6]));
90 if (!MACHINE_HAS_IEEE)
92 asm volatile("ld 1,%0" : : "Q" (fprs[1]));
93 asm volatile("ld 3,%0" : : "Q" (fprs[3]));
94 asm volatile("ld 5,%0" : : "Q" (fprs[5]));
95 asm volatile("ld 7,%0" : : "Q" (fprs[7]));
96 asm volatile("ld 8,%0" : : "Q" (fprs[8]));
97 asm volatile("ld 9,%0" : : "Q" (fprs[9]));
98 asm volatile("ld 10,%0" : : "Q" (fprs[10]));
99 asm volatile("ld 11,%0" : : "Q" (fprs[11]));
100 asm volatile("ld 12,%0" : : "Q" (fprs[12]));
101 asm volatile("ld 13,%0" : : "Q" (fprs[13]));
102 asm volatile("ld 14,%0" : : "Q" (fprs[14]));
103 asm volatile("ld 15,%0" : : "Q" (fprs[15]));
106 static inline void save_access_regs(unsigned int *acrs)
108 typedef struct { int _[NUM_ACRS]; } acrstype;
110 asm volatile("stam 0,15,%0" : "=Q" (*(acrstype *)acrs));
113 static inline void restore_access_regs(unsigned int *acrs)
115 typedef struct { int _[NUM_ACRS]; } acrstype;
117 asm volatile("lam 0,15,%0" : : "Q" (*(acrstype *)acrs));
120 #define switch_to(prev,next,last) do { \
122 save_fp_ctl(&prev->thread.fp_regs.fpc); \
123 save_fp_regs(prev->thread.fp_regs.fprs); \
124 save_access_regs(&prev->thread.acrs[0]); \
125 save_ri_cb(prev->thread.ri_cb); \
128 restore_fp_ctl(&next->thread.fp_regs.fpc); \
129 restore_fp_regs(next->thread.fp_regs.fprs); \
130 restore_access_regs(&next->thread.acrs[0]); \
131 restore_ri_cb(next->thread.ri_cb, prev->thread.ri_cb); \
132 update_cr_regs(next); \
134 prev = __switch_to(prev,next); \
137 #endif /* __ASM_SWITCH_TO_H */