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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_CWP                2
 18 #define TI_FLAG_CWP_SHIFT               40
 19 #define TI_FLAG_BYTE_CURRENT_DS         3
 20 #define TI_FLAG_CURRENT_DS_SHIFT        32
 21 #define TI_FLAG_BYTE_FPDEPTH            4
 22 #define TI_FLAG_FPDEPTH_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 struct exec_domain;
 35 
 36 struct thread_info {
 37         /* D$ line 1 */
 38         struct task_struct      *task;
 39         unsigned long           flags;
 40         __u8                    fpsaved[7];
 41         __u8                    status;
 42         unsigned long           ksp;
 43 
 44         /* D$ line 2 */
 45         unsigned long           fault_address;
 46         struct pt_regs          *kregs;
 47         struct exec_domain      *exec_domain;
 48         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
 49         __u8                    new_child;
 50         __u8                    syscall_noerror;
 51         __u16                   cpu;
 52 
 53         unsigned long           *utraps;
 54 
 55         struct reg_window       reg_window[NSWINS];
 56         unsigned long           rwbuf_stkptrs[NSWINS];
 57 
 58         unsigned long           gsr[7];
 59         unsigned long           xfsr[7];
 60 
 61         __u64                   __user *user_cntd0;
 62         __u64                   __user *user_cntd1;
 63         __u64                   kernel_cntd0, kernel_cntd1;
 64         __u64                   pcr_reg;
 65 
 66         struct restart_block    restart_block;
 67 
 68         struct pt_regs          *kern_una_regs;
 69         unsigned int            kern_una_insn;
 70 
 71         unsigned long           fpregs[0] __attribute__ ((aligned(64)));
 72 };
 73 
 74 #endif /* !(__ASSEMBLY__) */
 75 
 76 /* offsets into the thread_info struct for assembly code access */
 77 #define TI_TASK         0x00000000
 78 #define TI_FLAGS        0x00000008
 79 #define TI_FAULT_CODE   (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
 80 #define TI_WSTATE       (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
 81 #define TI_CWP          (TI_FLAGS + TI_FLAG_BYTE_CWP)
 82 #define TI_CURRENT_DS   (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
 83 #define TI_FPDEPTH      (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
 84 #define TI_WSAVED       (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
 85 #define TI_FPSAVED      0x00000010
 86 #define TI_KSP          0x00000018
 87 #define TI_FAULT_ADDR   0x00000020
 88 #define TI_KREGS        0x00000028
 89 #define TI_EXEC_DOMAIN  0x00000030
 90 #define TI_PRE_COUNT    0x00000038
 91 #define TI_NEW_CHILD    0x0000003c
 92 #define TI_SYS_NOERROR  0x0000003d
 93 #define TI_CPU          0x0000003e
 94 #define TI_UTRAPS       0x00000040
 95 #define TI_REG_WINDOW   0x00000048
 96 #define TI_RWIN_SPTRS   0x000003c8
 97 #define TI_GSR          0x00000400
 98 #define TI_XFSR         0x00000438
 99 #define TI_USER_CNTD0   0x00000470
100 #define TI_USER_CNTD1   0x00000478
101 #define TI_KERN_CNTD0   0x00000480
102 #define TI_KERN_CNTD1   0x00000488
103 #define TI_PCR          0x00000490
104 #define TI_RESTART_BLOCK 0x00000498
105 #define TI_KUNA_REGS    0x000004c8
106 #define TI_KUNA_INSN    0x000004d0
107 #define TI_FPREGS       0x00000500
108 
109 /* We embed this in the uppermost byte of thread_info->flags */
110 #define FAULT_CODE_WRITE        0x01    /* Write access, implies D-TLB     */
111 #define FAULT_CODE_DTLB         0x02    /* Miss happened in D-TLB          */
112 #define FAULT_CODE_ITLB         0x04    /* Miss happened in I-TLB          */
113 #define FAULT_CODE_WINFIXUP     0x08    /* Miss happened during spill/fill */
114 #define FAULT_CODE_BLKCOMMIT    0x10    /* Use blk-commit ASI in copy_page */
115 
116 #if PAGE_SHIFT == 13
117 #define THREAD_SIZE (2*PAGE_SIZE)
118 #define THREAD_SHIFT (PAGE_SHIFT + 1)
119 #else /* PAGE_SHIFT == 13 */
120 #define THREAD_SIZE PAGE_SIZE
121 #define THREAD_SHIFT PAGE_SHIFT
122 #endif /* PAGE_SHIFT == 13 */
123 
124 #define PREEMPT_ACTIVE          0x4000000
125 
126 /*
127  * macros/functions for gaining access to the thread information structure
128  */
129 #ifndef __ASSEMBLY__
130 
131 #define INIT_THREAD_INFO(tsk)                           \
132 {                                                       \
133         .task           =       &tsk,                   \
134         .flags          = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT,   \
135         .exec_domain    =       &default_exec_domain,   \
136         .preempt_count  =       INIT_PREEMPT_COUNT,     \
137         .restart_block  = {                             \
138                 .fn     =       do_no_restart_syscall,  \
139         },                                              \
140 }
141 
142 #define init_thread_info        (init_thread_union.thread_info)
143 #define init_stack              (init_thread_union.stack)
144 
145 /* how to get the thread information struct from C */
146 register struct thread_info *current_thread_info_reg asm("g6");
147 #define current_thread_info()   (current_thread_info_reg)
148 
149 /* thread information allocation */
150 #if PAGE_SHIFT == 13
151 #define __THREAD_INFO_ORDER     1
152 #else /* PAGE_SHIFT == 13 */
153 #define __THREAD_INFO_ORDER     0
154 #endif /* PAGE_SHIFT == 13 */
155 
156 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
157 
158 #ifdef CONFIG_DEBUG_STACK_USAGE
159 #define alloc_thread_info(tsk)                                  \
160 ({                                                              \
161         struct thread_info *ret;                                \
162                                                                 \
163         ret = (struct thread_info *)                            \
164           __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER);    \
165         if (ret)                                                \
166                 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
167         ret;                                                    \
168 })
169 #else
170 #define alloc_thread_info(tsk) \
171         ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
172 #endif
173 
174 #define free_thread_info(ti) \
175         free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
176 
177 #define __thread_flag_byte_ptr(ti)      \
178         ((unsigned char *)(&((ti)->flags)))
179 #define __cur_thread_flag_byte_ptr      __thread_flag_byte_ptr(current_thread_info())
180 
181 #define get_thread_fault_code()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
182 #define set_thread_fault_code(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
183 #define get_thread_wstate()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
184 #define set_thread_wstate(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
185 #define get_thread_cwp()                (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
186 #define set_thread_cwp(val)             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
187 #define get_thread_current_ds()         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
188 #define set_thread_current_ds(val)      (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
189 #define get_thread_fpdepth()            (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
190 #define set_thread_fpdepth(val)         (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
191 #define get_thread_wsaved()             (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
192 #define set_thread_wsaved(val)          (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
193 
194 #endif /* !(__ASSEMBLY__) */
195 
196 /*
197  * Thread information flags, only 16 bits are available as we encode
198  * other values into the upper 6 bytes.
199  *
200  * On trap return we need to test several values:
201  *
202  * user:        need_resched, notify_resume, sigpending, wsaved, perfctr
203  * kernel:      fpdepth
204  *
205  * So to check for work in the kernel case we simply load the fpdepth
206  * byte out of the flags and test it.  For the user case we encode the
207  * lower 3 bytes of flags as follows:
208  *      ----------------------------------------
209  *      | wsaved | flags byte 1 | flags byte 2 |
210  *      ----------------------------------------
211  * This optimizes the user test into:
212  *      ldx             [%g6 + TI_FLAGS], REG1
213  *      sethi           %hi(_TIF_USER_WORK_MASK), REG2
214  *      or              REG2, %lo(_TIF_USER_WORK_MASK), REG2
215  *      andcc           REG1, REG2, %g0
216  *      be,pt           no_work_to_do
217  *       nop
218  */
219 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
220 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
221 #define TIF_SIGPENDING          2       /* signal pending */
222 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
223 #define TIF_PERFCTR             4       /* performance counters active */
224 #define TIF_UNALIGNED           5       /* allowed to do unaligned accesses */
225 /* flag bit 6 is available */
226 #define TIF_32BIT               7       /* 32-bit binary */
227 /* flag bit 8 is available */
228 #define TIF_SECCOMP             9       /* secure computing */
229 #define TIF_SYSCALL_AUDIT       10      /* syscall auditing active */
230 /* NOTE: Thread flags >= 12 should be ones we have no interest
231  *       in using in assembly, else we can't use the mask as
232  *       an immediate value in instructions such as andcc.
233  */
234 /* flag bit 12 is available */
235 #define TIF_MEMDIE              13
236 #define TIF_POLLING_NRFLAG      14
237 #define TIF_FREEZE              15      /* is freezing for suspend */
238 
239 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
240 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
241 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
242 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
243 #define _TIF_PERFCTR            (1<<TIF_PERFCTR)
244 #define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
245 #define _TIF_32BIT              (1<<TIF_32BIT)
246 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
247 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
248 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
249 #define _TIF_FREEZE             (1<<TIF_FREEZE)
250 
251 #define _TIF_USER_WORK_MASK     ((0xff << TI_FLAG_WSAVED_SHIFT) | \
252                                  _TIF_DO_NOTIFY_RESUME_MASK | \
253                                  _TIF_NEED_RESCHED | _TIF_PERFCTR)
254 #define _TIF_DO_NOTIFY_RESUME_MASK      (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
255 
256 /*
257  * Thread-synchronous status.
258  *
259  * This is different from the flags in that nobody else
260  * ever touches our thread-synchronous status, so we don't
261  * have to worry about atomic accesses.
262  *
263  * Note that there are only 8 bits available.
264  */
265 #define TS_RESTORE_SIGMASK      0x0001  /* restore signal mask in do_signal() */
266 
267 #ifndef __ASSEMBLY__
268 #define HAVE_SET_RESTORE_SIGMASK        1
269 static inline void set_restore_sigmask(void)
270 {
271         struct thread_info *ti = current_thread_info();
272         ti->status |= TS_RESTORE_SIGMASK;
273         set_bit(TIF_SIGPENDING, &ti->flags);
274 }
275 #endif  /* !__ASSEMBLY__ */
276 
277 #endif /* __KERNEL__ */
278 
279 #endif /* _ASM_THREAD_INFO_H */
280 

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