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_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
30 #include <asm/ptrace.h>
31 #include <asm/types.h>
38 struct task_struct *task;
45 unsigned long fault_address;
46 struct pt_regs *kregs;
47 struct exec_domain *exec_domain;
48 int preempt_count; /* 0 => preemptable, <0 => BUG */
53 unsigned long *utraps;
55 struct reg_window reg_window[NSWINS];
56 unsigned long rwbuf_stkptrs[NSWINS];
59 unsigned long xfsr[7];
61 struct restart_block restart_block;
63 struct pt_regs *kern_una_regs;
64 unsigned int kern_una_insn;
66 unsigned long fpregs[0] __attribute__ ((aligned(64)));
69 #endif /* !(__ASSEMBLY__) */
71 /* offsets into the thread_info struct for assembly code access */
72 #define TI_TASK 0x00000000
73 #define TI_FLAGS 0x00000008
74 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
75 #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
76 #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
77 #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
78 #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
79 #define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR)
80 #define TI_FPSAVED 0x00000010
81 #define TI_KSP 0x00000018
82 #define TI_FAULT_ADDR 0x00000020
83 #define TI_KREGS 0x00000028
84 #define TI_EXEC_DOMAIN 0x00000030
85 #define TI_PRE_COUNT 0x00000038
86 #define TI_NEW_CHILD 0x0000003c
87 #define TI_CURRENT_DS 0x0000003d
88 #define TI_CPU 0x0000003e
89 #define TI_UTRAPS 0x00000040
90 #define TI_REG_WINDOW 0x00000048
91 #define TI_RWIN_SPTRS 0x000003c8
92 #define TI_GSR 0x00000400
93 #define TI_XFSR 0x00000438
94 #define TI_RESTART_BLOCK 0x00000470
95 #define TI_KUNA_REGS 0x000004a0
96 #define TI_KUNA_INSN 0x000004a8
97 #define TI_FPREGS 0x000004c0
99 /* We embed this in the uppermost byte of thread_info->flags */
100 #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
101 #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
102 #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
103 #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
104 #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
105 #define FAULT_CODE_BAD_RA 0x20 /* Bad RA for sun4v */
108 #define THREAD_SIZE (2*PAGE_SIZE)
109 #define THREAD_SHIFT (PAGE_SHIFT + 1)
110 #else /* PAGE_SHIFT == 13 */
111 #define THREAD_SIZE PAGE_SIZE
112 #define THREAD_SHIFT PAGE_SHIFT
113 #endif /* PAGE_SHIFT == 13 */
116 * macros/functions for gaining access to the thread information structure
120 #define INIT_THREAD_INFO(tsk) \
123 .current_ds = ASI_P, \
124 .exec_domain = &default_exec_domain, \
125 .preempt_count = INIT_PREEMPT_COUNT, \
127 .fn = do_no_restart_syscall, \
131 #define init_thread_info (init_thread_union.thread_info)
132 #define init_stack (init_thread_union.stack)
134 /* how to get the thread information struct from C */
135 register struct thread_info *current_thread_info_reg asm("g6");
136 #define current_thread_info() (current_thread_info_reg)
138 /* thread information allocation */
140 #define THREAD_SIZE_ORDER 1
141 #else /* PAGE_SHIFT == 13 */
142 #define THREAD_SIZE_ORDER 0
143 #endif /* PAGE_SHIFT == 13 */
145 #define __thread_flag_byte_ptr(ti) \
146 ((unsigned char *)(&((ti)->flags)))
147 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
149 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
150 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
151 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
152 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
153 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
154 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
155 #define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR])
156 #define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val))
157 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
158 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
159 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
160 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
161 #endif /* !(__ASSEMBLY__) */
164 * Thread information flags, only 16 bits are available as we encode
165 * other values into the upper 6 bytes.
167 * On trap return we need to test several values:
169 * user: need_resched, notify_resume, sigpending, wsaved
172 * So to check for work in the kernel case we simply load the fpdepth
173 * byte out of the flags and test it. For the user case we encode the
174 * lower 3 bytes of flags as follows:
175 * ----------------------------------------
176 * | wsaved | flags byte 1 | flags byte 2 |
177 * ----------------------------------------
178 * This optimizes the user test into:
179 * ldx [%g6 + TI_FLAGS], REG1
180 * sethi %hi(_TIF_USER_WORK_MASK), REG2
181 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
182 * andcc REG1, REG2, %g0
183 * be,pt no_work_to_do
186 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
187 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
188 #define TIF_SIGPENDING 2 /* signal pending */
189 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
190 /* flag bit 4 is available */
191 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
192 /* flag bit 6 is available */
193 #define TIF_32BIT 7 /* 32-bit binary */
194 #define TIF_NOHZ 8 /* in adaptive nohz mode */
195 #define TIF_SECCOMP 9 /* secure computing */
196 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
197 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */
198 /* NOTE: Thread flags >= 12 should be ones we have no interest
199 * in using in assembly, else we can't use the mask as
200 * an immediate value in instructions such as andcc.
202 /* flag bit 12 is available */
203 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */
204 #define TIF_POLLING_NRFLAG 14
206 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
207 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
208 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
209 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
210 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
211 #define _TIF_32BIT (1<<TIF_32BIT)
212 #define _TIF_NOHZ (1<<TIF_NOHZ)
213 #define _TIF_SECCOMP (1<<TIF_SECCOMP)
214 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
215 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
216 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
218 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
219 _TIF_DO_NOTIFY_RESUME_MASK | \
221 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING)
224 * Thread-synchronous status.
226 * This is different from the flags in that nobody else
227 * ever touches our thread-synchronous status, so we don't
228 * have to worry about atomic accesses.
230 * Note that there are only 8 bits available.
232 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */
235 #define HAVE_SET_RESTORE_SIGMASK 1
236 static inline void set_restore_sigmask(void)
238 struct thread_info *ti = current_thread_info();
239 ti->status |= TS_RESTORE_SIGMASK;
240 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
242 static inline void clear_restore_sigmask(void)
244 current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
246 static inline bool test_restore_sigmask(void)
248 return current_thread_info()->status & TS_RESTORE_SIGMASK;
250 static inline bool test_and_clear_restore_sigmask(void)
252 struct thread_info *ti = current_thread_info();
253 if (!(ti->status & TS_RESTORE_SIGMASK))
255 ti->status &= ~TS_RESTORE_SIGMASK;
259 #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0)
260 #define test_thread_64bit_stack(__SP) \
261 ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \
264 #endif /* !__ASSEMBLY__ */
266 #endif /* __KERNEL__ */
268 #endif /* _ASM_THREAD_INFO_H */