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 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ 231 /* flag bit 11 is available */ 232 /* NOTE: Thread flags >= 12 should be ones we have no interest 233 * in using in assembly, else we can't use the mask as 234 * an immediate value in instructions such as andcc. 235 */ 236 #define TIF_ABI_PENDING 12 237 #define TIF_MEMDIE 13 238 #define TIF_POLLING_NRFLAG 14 239 #define TIF_FREEZE 15 /* is freezing for suspend */ 240 241 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 242 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 243 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 244 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 245 #define _TIF_PERFCTR (1<<TIF_PERFCTR) 246 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED) 247 #define _TIF_32BIT (1<<TIF_32BIT) 248 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 249 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 250 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 251 #define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING) 252 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 253 #define _TIF_FREEZE (1<<TIF_FREEZE) 254 255 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \ 256 _TIF_DO_NOTIFY_RESUME_MASK | \ 257 _TIF_NEED_RESCHED | _TIF_PERFCTR) 258 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING) 259 260 /* 261 * Thread-synchronous status. 262 * 263 * This is different from the flags in that nobody else 264 * ever touches our thread-synchronous status, so we don't 265 * have to worry about atomic accesses. 266 * 267 * Note that there are only 8 bits available. 268 */ 269 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */ 270 271 #ifndef __ASSEMBLY__ 272 #define HAVE_SET_RESTORE_SIGMASK 1 273 static inline void set_restore_sigmask(void) 274 { 275 struct thread_info *ti = current_thread_info(); 276 ti->status |= TS_RESTORE_SIGMASK; 277 set_bit(TIF_SIGPENDING, &ti->flags); 278 } 279 #endif /* !__ASSEMBLY__ */ 280 281 #endif /* __KERNEL__ */ 282 283 #endif /* _ASM_THREAD_INFO_H */ 284