1 /* $Id: thread_info.h,v 1.1 2002/02/10 00:00:58 davem Exp $
2 * thread_info.h: sparc64 low-level thread information
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
7 #ifndef _ASM_THREAD_INFO_H
8 #define _ASM_THREAD_INFO_H
14 #define TI_FLAG_BYTE_FAULT_CODE 0
15 #define TI_FLAG_FAULT_CODE_SHIFT 56
16 #define TI_FLAG_BYTE_WSTATE 1
17 #define TI_FLAG_WSTATE_SHIFT 48
18 #define TI_FLAG_BYTE_CWP 2
19 #define TI_FLAG_CWP_SHIFT 40
20 #define TI_FLAG_BYTE_CURRENT_DS 3
21 #define TI_FLAG_CURRENT_DS_SHIFT 32
22 #define TI_FLAG_BYTE_FPDEPTH 4
23 #define TI_FLAG_FPDEPTH_SHIFT 24
24 #define TI_FLAG_BYTE_WSAVED 5
25 #define TI_FLAG_WSAVED_SHIFT 16
31 #include <asm/ptrace.h>
32 #include <asm/types.h>
39 struct task_struct *task;
46 unsigned long fault_address;
47 struct pt_regs *kregs;
48 struct exec_domain *exec_domain;
49 int preempt_count; /* 0 => preemptable, <0 => BUG */
54 unsigned long *utraps;
56 struct reg_window reg_window[NSWINS];
57 unsigned long rwbuf_stkptrs[NSWINS];
60 unsigned long xfsr[7];
62 __u64 __user *user_cntd0;
63 __u64 __user *user_cntd1;
64 __u64 kernel_cntd0, kernel_cntd1;
69 struct restart_block restart_block;
71 unsigned long fpregs[0] __attribute__ ((aligned(64)));
74 #endif /* !(__ASSEMBLY__) */
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_CPU 0x00000010
86 #define TI_FPSAVED 0x00000011
87 #define TI_KSP 0x00000018
88 #define TI_FAULT_ADDR 0x00000020
89 #define TI_KREGS 0x00000028
90 #define TI_EXEC_DOMAIN 0x00000030
91 #define TI_PRE_COUNT 0x00000038
92 #define TI_NEW_CHILD 0x0000003c
93 #define TI_SYS_NOERROR 0x0000003d
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_CEE_STUFF 0x00000498
105 #define TI_RESTART_BLOCK 0x000004a0
106 #define TI_FPREGS 0x00000500
108 /* We embed this in the uppermost byte of thread_info->flags */
109 #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
110 #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
111 #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
112 #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
113 #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
116 #define THREAD_SIZE (2*PAGE_SIZE)
117 #define THREAD_SHIFT (PAGE_SHIFT + 1)
118 #else /* PAGE_SHIFT == 13 */
119 #define THREAD_SIZE PAGE_SIZE
120 #define THREAD_SHIFT PAGE_SHIFT
121 #endif /* PAGE_SHIFT == 13 */
123 #define PREEMPT_ACTIVE 0x4000000
126 * macros/functions for gaining access to the thread information structure
128 * preempt_count needs to be 1 initially, until the scheduler is functional.
132 #define INIT_THREAD_INFO(tsk) \
135 .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
136 .exec_domain = &default_exec_domain, \
137 .preempt_count = 1, \
139 .fn = do_no_restart_syscall, \
143 #define init_thread_info (init_thread_union.thread_info)
144 #define init_stack (init_thread_union.stack)
146 /* how to get the thread information struct from C */
147 register struct thread_info *current_thread_info_reg asm("g6");
148 #define current_thread_info() (current_thread_info_reg)
150 /* thread information allocation */
152 #define __THREAD_INFO_ORDER 1
153 #else /* PAGE_SHIFT == 13 */
154 #define __THREAD_INFO_ORDER 0
155 #endif /* PAGE_SHIFT == 13 */
157 #ifdef CONFIG_DEBUG_STACK_USAGE
158 #define alloc_thread_info(tsk) \
160 struct thread_info *ret; \
162 ret = (struct thread_info *) \
163 __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \
165 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
169 #define alloc_thread_info(tsk) \
170 ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
173 #define free_thread_info(ti) \
174 free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
176 #define __thread_flag_byte_ptr(ti) \
177 ((unsigned char *)(&((ti)->flags)))
178 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
180 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
181 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
182 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
183 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
184 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
185 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
186 #define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
187 #define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
188 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
189 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
190 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
191 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
193 #endif /* !(__ASSEMBLY__) */
196 * Thread information flags, only 16 bits are available as we encode
197 * other values into the upper 6 bytes.
199 * On trap return we need to test several values:
201 * user: need_resched, notify_resume, sigpending, wsaved, perfctr
204 * So to check for work in the kernel case we simply load the fpdepth
205 * byte out of the flags and test it. For the user case we encode the
206 * lower 3 bytes of flags as follows:
207 * ----------------------------------------
208 * | wsaved | flags byte 1 | flags byte 2 |
209 * ----------------------------------------
210 * This optimizes the user test into:
211 * ldx [%g6 + TI_FLAGS], REG1
212 * sethi %hi(_TIF_USER_WORK_MASK), REG2
213 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
214 * andcc REG1, REG2, %g0
215 * be,pt no_work_to_do
218 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */
219 #define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
220 #define TIF_SIGPENDING 2 /* signal pending */
221 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */
222 #define TIF_PERFCTR 4 /* performance counters active */
223 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
224 #define TIF_NEWSIGNALS 6 /* wants new-style signals */
225 #define TIF_32BIT 7 /* 32-bit binary */
226 /* flag bit 8 is available */
227 #define TIF_SECCOMP 9 /* secure computing */
228 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
229 /* flag bit 11 is available */
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.
234 #define TIF_ABI_PENDING 12
235 #define TIF_MEMDIE 13
236 #define TIF_POLLING_NRFLAG 14
238 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
239 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
240 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
241 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
242 #define _TIF_PERFCTR (1<<TIF_PERFCTR)
243 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
244 #define _TIF_NEWSIGNALS (1<<TIF_NEWSIGNALS)
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_ABI_PENDING (1<<TIF_ABI_PENDING)
249 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
251 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
252 (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
253 _TIF_NEED_RESCHED | _TIF_PERFCTR))
255 #endif /* __KERNEL__ */
257 #endif /* _ASM_THREAD_INFO_H */