1 /* thread_info.h: sparc64 low-level thread information
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
6 #ifndef _ASM_THREAD_INFO_H
7 #define _ASM_THREAD_INFO_H
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_NOERROR 4
22 #define TI_FLAG_BYTE_NOERROR_SHIFT 24
23 #define TI_FLAG_BYTE_FPDEPTH 5
24 #define TI_FLAG_FPDEPTH_SHIFT 16
25 #define TI_FLAG_BYTE_WSAVED 6
26 #define TI_FLAG_WSAVED_SHIFT 8
32 #include <asm/ptrace.h>
33 #include <asm/types.h>
40 struct task_struct *task;
47 unsigned long fault_address;
48 struct pt_regs *kregs;
49 struct exec_domain *exec_domain;
50 int preempt_count; /* 0 => preemptable, <0 => BUG */
55 unsigned long *utraps;
57 struct reg_window reg_window[NSWINS];
58 unsigned long rwbuf_stkptrs[NSWINS];
61 unsigned long xfsr[7];
63 struct restart_block restart_block;
65 struct pt_regs *kern_una_regs;
66 unsigned int kern_una_insn;
68 unsigned long fpregs[0] __attribute__ ((aligned(64)));
71 #endif /* !(__ASSEMBLY__) */
73 /* offsets into the thread_info struct for assembly code access */
74 #define TI_TASK 0x00000000
75 #define TI_FLAGS 0x00000008
76 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
77 #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
78 #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
79 #define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
80 #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
81 #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
82 #define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
83 #define TI_FPSAVED 0x00000010
84 #define TI_KSP 0x00000018
85 #define TI_FAULT_ADDR 0x00000020
86 #define TI_KREGS 0x00000028
87 #define TI_EXEC_DOMAIN 0x00000030
88 #define TI_PRE_COUNT 0x00000038
89 #define TI_NEW_CHILD 0x0000003c
90 #define TI_CPU 0x0000003e
91 #define TI_UTRAPS 0x00000040
92 #define TI_REG_WINDOW 0x00000048
93 #define TI_RWIN_SPTRS 0x000003c8
94 #define TI_GSR 0x00000400
95 #define TI_XFSR 0x00000438
96 #define TI_RESTART_BLOCK 0x00000470
97 #define TI_KUNA_REGS 0x000004a0
98 #define TI_KUNA_INSN 0x000004a8
99 #define TI_FPREGS 0x000004c0
101 /* We embed this in the uppermost byte of thread_info->flags */
102 #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
103 #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
104 #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
105 #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
106 #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
109 #define THREAD_SIZE (2*PAGE_SIZE)
110 #define THREAD_SHIFT (PAGE_SHIFT + 1)
111 #else /* PAGE_SHIFT == 13 */
112 #define THREAD_SIZE PAGE_SIZE
113 #define THREAD_SHIFT PAGE_SHIFT
114 #endif /* PAGE_SHIFT == 13 */
116 #define PREEMPT_ACTIVE 0x10000000
119 * macros/functions for gaining access to the thread information structure
123 #define INIT_THREAD_INFO(tsk) \
126 .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
127 .exec_domain = &default_exec_domain, \
128 .preempt_count = INIT_PREEMPT_COUNT, \
130 .fn = do_no_restart_syscall, \
134 #define init_thread_info (init_thread_union.thread_info)
135 #define init_stack (init_thread_union.stack)
137 /* how to get the thread information struct from C */
138 register struct thread_info *current_thread_info_reg asm("g6");
139 #define current_thread_info() (current_thread_info_reg)
141 /* thread information allocation */
143 #define THREAD_SIZE_ORDER 1
144 #else /* PAGE_SHIFT == 13 */
145 #define THREAD_SIZE_ORDER 0
146 #endif /* PAGE_SHIFT == 13 */
148 #define __thread_flag_byte_ptr(ti) \
149 ((unsigned char *)(&((ti)->flags)))
150 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
152 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
153 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
154 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
155 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
156 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
157 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
158 #define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
159 #define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
160 #define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
161 #define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
162 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
163 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
164 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
165 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
167 #endif /* !(__ASSEMBLY__) */
170 * Thread information flags, only 16 bits are available as we encode
171 * other values into the upper 6 bytes.
173 * On trap return we need to test several values:
175 * user: need_resched, notify_resume, sigpending, wsaved
178 * So to check for work in the kernel case we simply load the fpdepth
179 * byte out of the flags and test it. For the user case we encode the
180 * lower 3 bytes of flags as follows:
181 * ----------------------------------------
182 * | wsaved | flags byte 1 | flags byte 2 |
183 * ----------------------------------------
184 * This optimizes the user test into:
185 * ldx [%g6 + TI_FLAGS], REG1
186 * sethi %hi(_TIF_USER_WORK_MASK), REG2
187 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
188 * andcc REG1, REG2, %g0
189 * be,pt no_work_to_do
192 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
193 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
194 #define TIF_SIGPENDING 2 /* signal pending */
195 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
196 /* flag bit 4 is available */
197 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
198 /* flag bit 6 is available */
199 #define TIF_32BIT 7 /* 32-bit binary */
200 /* flag bit 8 is available */
201 #define TIF_SECCOMP 9 /* secure computing */
202 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
203 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
204 /* NOTE: Thread flags >= 12 should be ones we have no interest
205 * in using in assembly, else we can't use the mask as
206 * an immediate value in instructions such as andcc.
208 /* flag bit 12 is available */
209 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */
210 #define TIF_POLLING_NRFLAG 14
212 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
213 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
214 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
215 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
216 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
217 #define _TIF_32BIT (1<<TIF_32BIT)
218 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
219 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
220 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
221 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
223 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
224 _TIF_DO_NOTIFY_RESUME_MASK | \
226 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
229 * Thread-synchronous status.
231 * This is different from the flags in that nobody else
232 * ever touches our thread-synchronous status, so we don't
233 * have to worry about atomic accesses.
235 * Note that there are only 8 bits available.
237 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
240 #define HAVE_SET_RESTORE_SIGMASK 1
241 static inline void set_restore_sigmask(void)
243 struct thread_info *ti = current_thread_info();
244 ti->status |= TS_RESTORE_SIGMASK;
245 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
247 static inline void clear_restore_sigmask(void)
249 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
251 static inline bool test_restore_sigmask(void)
253 return current_thread_info()->status & TS_RESTORE_SIGMASK;
255 static inline bool test_and_clear_restore_sigmask(void)
257 struct thread_info *ti = current_thread_info();
258 if (!(ti->status & TS_RESTORE_SIGMASK))
260 ti->status &= ~TS_RESTORE_SIGMASK;
263 #endif /* !__ASSEMBLY__ */
265 #endif /* __KERNEL__ */
267 #endif /* _ASM_THREAD_INFO_H */