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Linux/arch/sparc/include/asm/thread_info_64.h

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  1 /* thread_info.h: sparc64 low-level thread information
  2  *
  3  * Copyright (C) 2002  David S. Miller (davem@redhat.com)
  4  */
  5 
  6 #ifndef _ASM_THREAD_INFO_H
  7 #define _ASM_THREAD_INFO_H
  8 
  9 #ifdef __KERNEL__
 10 
 11 #define NSWINS          7
 12 
 13 #define TI_FLAG_BYTE_FAULT_CODE         0
 14 #define TI_FLAG_FAULT_CODE_SHIFT        56
 15 #define TI_FLAG_BYTE_WSTATE             1
 16 #define TI_FLAG_WSTATE_SHIFT            48
 17 #define TI_FLAG_BYTE_NOERROR            2
 18 #define TI_FLAG_BYTE_NOERROR_SHIFT      40
 19 #define TI_FLAG_BYTE_FPDEPTH            3
 20 #define TI_FLAG_FPDEPTH_SHIFT           32
 21 #define TI_FLAG_BYTE_CWP                4
 22 #define TI_FLAG_CWP_SHIFT               24
 23 #define TI_FLAG_BYTE_WSAVED             5
 24 #define TI_FLAG_WSAVED_SHIFT            16
 25 
 26 #include <asm/page.h>
 27 
 28 #ifndef __ASSEMBLY__
 29 
 30 #include <asm/ptrace.h>
 31 #include <asm/types.h>
 32 
 33 struct task_struct;
 34 
 35 struct thread_info {
 36         /* D$ line 1 */
 37         struct task_struct      *task;
 38         unsigned long           flags;
 39         __u8                    fpsaved[7];
 40         __u8                    status;
 41         unsigned long           ksp;
 42 
 43         /* D$ line 2 */
 44         unsigned long           fault_address;
 45         struct pt_regs          *kregs;
 46         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
 47         __u8                    new_child;
 48         __u8                    current_ds;
 49         __u16                   cpu;
 50 
 51         unsigned long           *utraps;
 52 
 53         struct reg_window       reg_window[NSWINS];
 54         unsigned long           rwbuf_stkptrs[NSWINS];
 55 
 56         unsigned long           gsr[7];
 57         unsigned long           xfsr[7];
 58 
 59         struct pt_regs          *kern_una_regs;
 60         unsigned int            kern_una_insn;
 61 
 62         unsigned long           fpregs[(7 * 256) / sizeof(unsigned long)]
 63                 __attribute__ ((aligned(64)));
 64 };
 65 
 66 #endif /* !(__ASSEMBLY__) */
 67 
 68 /* offsets into the thread_info struct for assembly code access */
 69 #define TI_TASK         0x00000000
 70 #define TI_FLAGS        0x00000008
 71 #define TI_FAULT_CODE   (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
 72 #define TI_WSTATE       (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
 73 #define TI_CWP          (TI_FLAGS + TI_FLAG_BYTE_CWP)
 74 #define TI_FPDEPTH      (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
 75 #define TI_WSAVED       (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
 76 #define TI_SYS_NOERROR  (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
 77 #define TI_FPSAVED      0x00000010
 78 #define TI_KSP          0x00000018
 79 #define TI_FAULT_ADDR   0x00000020
 80 #define TI_KREGS        0x00000028
 81 #define TI_PRE_COUNT    0x00000030
 82 #define TI_NEW_CHILD    0x00000034
 83 #define TI_CURRENT_DS   0x00000035
 84 #define TI_CPU          0x00000036
 85 #define TI_UTRAPS       0x00000038
 86 #define TI_REG_WINDOW   0x00000040
 87 #define TI_RWIN_SPTRS   0x000003c0
 88 #define TI_GSR          0x000003f8
 89 #define TI_XFSR         0x00000430
 90 #define TI_KUNA_REGS    0x00000468
 91 #define TI_KUNA_INSN    0x00000470
 92 #define TI_FPREGS       0x00000480
 93 
 94 /* We embed this in the uppermost byte of thread_info->flags */
 95 #define FAULT_CODE_WRITE        0x01    /* Write access, implies D-TLB     */
 96 #define FAULT_CODE_DTLB         0x02    /* Miss happened in D-TLB          */
 97 #define FAULT_CODE_ITLB         0x04    /* Miss happened in I-TLB          */
 98 #define FAULT_CODE_WINFIXUP     0x08    /* Miss happened during spill/fill */
 99 #define FAULT_CODE_BLKCOMMIT    0x10    /* Use blk-commit ASI in copy_page */
100 #define FAULT_CODE_BAD_RA       0x20    /* Bad RA for sun4v                */
101 
102 #if PAGE_SHIFT == 13
103 #define THREAD_SIZE (2*PAGE_SIZE)
104 #define THREAD_SHIFT (PAGE_SHIFT + 1)
105 #else /* PAGE_SHIFT == 13 */
106 #define THREAD_SIZE PAGE_SIZE
107 #define THREAD_SHIFT PAGE_SHIFT
108 #endif /* PAGE_SHIFT == 13 */
109 
110 /*
111  * macros/functions for gaining access to the thread information structure
112  */
113 #ifndef __ASSEMBLY__
114 
115 #define INIT_THREAD_INFO(tsk)                           \
116 {                                                       \
117         .task           =       &tsk,                   \
118         .current_ds     =       ASI_P,                  \
119         .preempt_count  =       INIT_PREEMPT_COUNT,     \
120 }
121 
122 #define init_thread_info        (init_thread_union.thread_info)
123 #define init_stack              (init_thread_union.stack)
124 
125 /* how to get the thread information struct from C */
126 register struct thread_info *current_thread_info_reg asm("g6");
127 #define current_thread_info()   (current_thread_info_reg)
128 
129 /* thread information allocation */
130 #if PAGE_SHIFT == 13
131 #define THREAD_SIZE_ORDER       1
132 #else /* PAGE_SHIFT == 13 */
133 #define THREAD_SIZE_ORDER       0
134 #endif /* PAGE_SHIFT == 13 */
135 
136 #define __thread_flag_byte_ptr(ti)      \
137         ((unsigned char *)(&((ti)->flags)))
138 #define __cur_thread_flag_byte_ptr      __thread_flag_byte_ptr(current_thread_info())
139 
140 #define get_thread_fault_code()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
141 #define set_thread_fault_code(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
142 #define get_thread_wstate()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
143 #define set_thread_wstate(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
144 #define get_thread_cwp()                (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
145 #define set_thread_cwp(val)             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
146 #define get_thread_noerror()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
147 #define set_thread_noerror(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
148 #define get_thread_fpdepth()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
149 #define set_thread_fpdepth(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
150 #define get_thread_wsaved()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
151 #define set_thread_wsaved(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
152 #endif /* !(__ASSEMBLY__) */
153 
154 /*
155  * Thread information flags, only 16 bits are available as we encode
156  * other values into the upper 6 bytes.
157  *
158  * On trap return we need to test several values:
159  *
160  * user:        need_resched, notify_resume, sigpending, wsaved
161  * kernel:      fpdepth
162  *
163  * So to check for work in the kernel case we simply load the fpdepth
164  * byte out of the flags and test it.  For the user case we encode the
165  * lower 3 bytes of flags as follows:
166  *      ----------------------------------------
167  *      | wsaved | flags byte 1 | flags byte 2 |
168  *      ----------------------------------------
169  * This optimizes the user test into:
170  *      ldx             [%g6 + TI_FLAGS], REG1
171  *      sethi           %hi(_TIF_USER_WORK_MASK), REG2
172  *      or              REG2, %lo(_TIF_USER_WORK_MASK), REG2
173  *      andcc           REG1, REG2, %g0
174  *      be,pt           no_work_to_do
175  *       nop
176  */
177 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
178 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
179 #define TIF_SIGPENDING          2       /* signal pending */
180 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
181 /* flag bit 4 is available */
182 #define TIF_UNALIGNED           5       /* allowed to do unaligned accesses */
183 /* flag bit 6 is available */
184 #define TIF_32BIT               7       /* 32-bit binary */
185 #define TIF_NOHZ                8       /* in adaptive nohz mode */
186 #define TIF_SECCOMP             9       /* secure computing */
187 #define TIF_SYSCALL_AUDIT       10      /* syscall auditing active */
188 #define TIF_SYSCALL_TRACEPOINT  11      /* syscall tracepoint instrumentation */
189 /* NOTE: Thread flags >= 12 should be ones we have no interest
190  *       in using in assembly, else we can't use the mask as
191  *       an immediate value in instructions such as andcc.
192  */
193 /* flag bit 12 is available */
194 #define TIF_MEMDIE              13      /* is terminating due to OOM killer */
195 #define TIF_POLLING_NRFLAG      14
196 
197 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
198 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
199 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
200 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
201 #define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
202 #define _TIF_32BIT              (1<<TIF_32BIT)
203 #define _TIF_NOHZ               (1<<TIF_NOHZ)
204 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
205 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
206 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
207 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
208 
209 #define _TIF_USER_WORK_MASK     ((0xff << TI_FLAG_WSAVED_SHIFT) | \
210                                  _TIF_DO_NOTIFY_RESUME_MASK | \
211                                  _TIF_NEED_RESCHED)
212 #define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
213 
214 #define is_32bit_task() (test_thread_flag(TIF_32BIT))
215 
216 /*
217  * Thread-synchronous status.
218  *
219  * This is different from the flags in that nobody else
220  * ever touches our thread-synchronous status, so we don't
221  * have to worry about atomic accesses.
222  *
223  * Note that there are only 8 bits available.
224  */
225 #define TS_RESTORE_SIGMASK      0x0001  /* restore signal mask in do_signal() */
226 
227 #ifndef __ASSEMBLY__
228 #define HAVE_SET_RESTORE_SIGMASK        1
229 static inline void set_restore_sigmask(void)
230 {
231         struct thread_info *ti = current_thread_info();
232         ti->status |= TS_RESTORE_SIGMASK;
233         WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
234 }
235 static inline void clear_restore_sigmask(void)
236 {
237         current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
238 }
239 static inline bool test_restore_sigmask(void)
240 {
241         return current_thread_info()->status & TS_RESTORE_SIGMASK;
242 }
243 static inline bool test_and_clear_restore_sigmask(void)
244 {
245         struct thread_info *ti = current_thread_info();
246         if (!(ti->status & TS_RESTORE_SIGMASK))
247                 return false;
248         ti->status &= ~TS_RESTORE_SIGMASK;
249         return true;
250 }
251 
252 #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
253 #define test_thread_64bit_stack(__SP) \
254         ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \
255          false : true)
256 
257 #endif  /* !__ASSEMBLY__ */
258 
259 #endif /* __KERNEL__ */
260 
261 #endif /* _ASM_THREAD_INFO_H */
262 

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