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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
3 *
4 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
5 */
6
7#ifndef _ASM_THREAD_INFO_H
8#define _ASM_THREAD_INFO_H
9
10#ifdef __KERNEL__
11
12#define NSWINS 7
13
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
26
27#include <asm/page.h>
28
29#ifndef __ASSEMBLY__
30
31#include <asm/ptrace.h>
32#include <asm/types.h>
33
34struct task_struct;
35struct exec_domain;
36
37struct thread_info {
38 /* D$ line 1 */
39 struct task_struct *task;
40 unsigned long flags;
41 __u8 cpu;
42 __u8 fpsaved[7];
43 unsigned long ksp;
44
45 /* D$ line 2 */
46 unsigned long fault_address;
47 struct pt_regs *kregs;
48 struct exec_domain *exec_domain;
49 int preempt_count; /* 0 => preemptable, <0 => BUG */
50 __u8 new_child;
51 __u8 syscall_noerror;
52 __u16 __pad;
53
54 unsigned long *utraps;
55
56 struct reg_window reg_window[NSWINS];
57 unsigned long rwbuf_stkptrs[NSWINS];
58
59 unsigned long gsr[7];
60 unsigned long xfsr[7];
61
62 __u64 __user *user_cntd0;
63 __u64 __user *user_cntd1;
64 __u64 kernel_cntd0, kernel_cntd1;
65 __u64 pcr_reg;
66
67 __u64 cee_stuff;
68
69 struct restart_block restart_block;
70
71 struct pt_regs *kern_una_regs;
72 unsigned int kern_una_insn;
73
74 unsigned long fpregs[0] __attribute__ ((aligned(64)));
75};
76
77#endif /* !(__ASSEMBLY__) */
78
79/* offsets into the thread_info struct for assembly code access */
80#define TI_TASK 0x00000000
81#define TI_FLAGS 0x00000008
82#define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE)
83#define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE)
84#define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP)
85#define TI_CURRENT_DS (TI_FLAGS + TI_FLAG_BYTE_CURRENT_DS)
86#define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH)
87#define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED)
88#define TI_CPU 0x00000010
89#define TI_FPSAVED 0x00000011
90#define TI_KSP 0x00000018
91#define TI_FAULT_ADDR 0x00000020
92#define TI_KREGS 0x00000028
93#define TI_EXEC_DOMAIN 0x00000030
94#define TI_PRE_COUNT 0x00000038
95#define TI_NEW_CHILD 0x0000003c
96#define TI_SYS_NOERROR 0x0000003d
97#define TI_UTRAPS 0x00000040
98#define TI_REG_WINDOW 0x00000048
99#define TI_RWIN_SPTRS 0x000003c8
100#define TI_GSR 0x00000400
101#define TI_XFSR 0x00000438
102#define TI_USER_CNTD0 0x00000470
103#define TI_USER_CNTD1 0x00000478
104#define TI_KERN_CNTD0 0x00000480
105#define TI_KERN_CNTD1 0x00000488
106#define TI_PCR 0x00000490
107#define TI_CEE_STUFF 0x00000498
108#define TI_RESTART_BLOCK 0x000004a0
109#define TI_KUNA_REGS 0x000004c8
110#define TI_KUNA_INSN 0x000004d0
111#define TI_FPREGS 0x00000500
112
113/* We embed this in the uppermost byte of thread_info->flags */
114#define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */
115#define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */
116#define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */
117#define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */
118#define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */
119
120#if PAGE_SHIFT == 13
121#define THREAD_SIZE (2*PAGE_SIZE)
122#define THREAD_SHIFT (PAGE_SHIFT + 1)
123#else /* PAGE_SHIFT == 13 */
124#define THREAD_SIZE PAGE_SIZE
125#define THREAD_SHIFT PAGE_SHIFT
126#endif /* PAGE_SHIFT == 13 */
127
128#define PREEMPT_ACTIVE 0x4000000
129
130/*
131 * macros/functions for gaining access to the thread information structure
132 *
133 * preempt_count needs to be 1 initially, until the scheduler is functional.
134 */
135#ifndef __ASSEMBLY__
136
137#define INIT_THREAD_INFO(tsk) \
138{ \
139 .task = &tsk, \
140 .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \
141 .exec_domain = &default_exec_domain, \
142 .preempt_count = 1, \
143 .restart_block = { \
144 .fn = do_no_restart_syscall, \
145 }, \
146}
147
148#define init_thread_info (init_thread_union.thread_info)
149#define init_stack (init_thread_union.stack)
150
151/* how to get the thread information struct from C */
152register struct thread_info *current_thread_info_reg asm("g6");
153#define current_thread_info() (current_thread_info_reg)
154
155/* thread information allocation */
156#if PAGE_SHIFT == 13
157#define __THREAD_INFO_ORDER 1
158#else /* PAGE_SHIFT == 13 */
159#define __THREAD_INFO_ORDER 0
160#endif /* PAGE_SHIFT == 13 */
161
162#ifdef CONFIG_DEBUG_STACK_USAGE
163#define alloc_thread_info(tsk) \
164({ \
165 struct thread_info *ret; \
166 \
167 ret = (struct thread_info *) \
168 __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \
169 if (ret) \
170 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \
171 ret; \
172})
173#else
174#define alloc_thread_info(tsk) \
175 ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER))
176#endif
177
178#define free_thread_info(ti) \
179 free_pages((unsigned long)(ti),__THREAD_INFO_ORDER)
180
181#define __thread_flag_byte_ptr(ti) \
182 ((unsigned char *)(&((ti)->flags)))
183#define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info())
184
185#define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE])
186#define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val))
187#define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE])
188#define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val))
189#define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP])
190#define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val))
191#define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS])
192#define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val))
193#define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH])
194#define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val))
195#define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED])
196#define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val))
197
198#endif /* !(__ASSEMBLY__) */
199
200/*
201 * Thread information flags, only 16 bits are available as we encode
202 * other values into the upper 6 bytes.
203 *
204 * On trap return we need to test several values:
205 *
206 * user: need_resched, notify_resume, sigpending, wsaved, perfctr
207 * kernel: fpdepth
208 *
209 * So to check for work in the kernel case we simply load the fpdepth
210 * byte out of the flags and test it. For the user case we encode the
211 * lower 3 bytes of flags as follows:
212 * ----------------------------------------
213 * | wsaved | flags byte 1 | flags byte 2 |
214 * ----------------------------------------
215 * This optimizes the user test into:
216 * ldx [%g6 + TI_FLAGS], REG1
217 * sethi %hi(_TIF_USER_WORK_MASK), REG2
218 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2
219 * andcc REG1, REG2, %g0
220 * be,pt no_work_to_do
221 * nop
222 */
223#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
224#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
225#define TIF_SIGPENDING 2 /* signal pending */
226#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
227#define TIF_PERFCTR 4 /* performance counters active */
228#define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */
229#define TIF_NEWSIGNALS 6 /* wants new-style signals */
230#define TIF_32BIT 7 /* 32-bit binary */
231/* flag bit 8 is available */
232#define TIF_SECCOMP 9 /* secure computing */
233#define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */
234/* flag bit 11 is available */
235/* NOTE: Thread flags >= 12 should be ones we have no interest
236 * in using in assembly, else we can't use the mask as
237 * an immediate value in instructions such as andcc.
238 */
239#define TIF_ABI_PENDING 12
240#define TIF_MEMDIE 13
241#define TIF_POLLING_NRFLAG 14
242
243#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
244#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
245#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
246#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
247#define _TIF_PERFCTR (1<<TIF_PERFCTR)
248#define _TIF_UNALIGNED (1<<TIF_UNALIGNED)
249#define _TIF_NEWSIGNALS (1<<TIF_NEWSIGNALS)
250#define _TIF_32BIT (1<<TIF_32BIT)
251#define _TIF_SECCOMP (1<<TIF_SECCOMP)
252#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
253#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
254#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
255
256#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \
257 (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
258 _TIF_NEED_RESCHED | _TIF_PERFCTR))
259
260#endif /* __KERNEL__ */
261
262#endif /* _ASM_THREAD_INFO_H */