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_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 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 current_ds; 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 struct restart_block restart_block; 62 63 struct pt_regs *kern_una_regs; 64 unsigned int kern_una_insn; 65 66 unsigned long fpregs[(7 * 256) / sizeof(unsigned long)] 67 __attribute__ ((aligned(64))); 68 }; 69 70 #endif /* !(__ASSEMBLY__) */ 71 72 /* offsets into the thread_info struct for assembly code access */ 73 #define TI_TASK 0x00000000 74 #define TI_FLAGS 0x00000008 75 #define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE) 76 #define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE) 77 #define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP) 78 #define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH) 79 #define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED) 80 #define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR) 81 #define TI_FPSAVED 0x00000010 82 #define TI_KSP 0x00000018 83 #define TI_FAULT_ADDR 0x00000020 84 #define TI_KREGS 0x00000028 85 #define TI_EXEC_DOMAIN 0x00000030 86 #define TI_PRE_COUNT 0x00000038 87 #define TI_NEW_CHILD 0x0000003c 88 #define TI_CURRENT_DS 0x0000003d 89 #define TI_CPU 0x0000003e 90 #define TI_UTRAPS 0x00000040 91 #define TI_REG_WINDOW 0x00000048 92 #define TI_RWIN_SPTRS 0x000003c8 93 #define TI_GSR 0x00000400 94 #define TI_XFSR 0x00000438 95 #define TI_RESTART_BLOCK 0x00000470 96 #define TI_KUNA_REGS 0x000004a0 97 #define TI_KUNA_INSN 0x000004a8 98 #define TI_FPREGS 0x000004c0 99 100 /* We embed this in the uppermost byte of thread_info->flags */ 101 #define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */ 102 #define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */ 103 #define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */ 104 #define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */ 105 #define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */ 106 #define FAULT_CODE_BAD_RA 0x20 /* Bad RA for sun4v */ 107 108 #if PAGE_SHIFT == 13 109 #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 */ 115 116 /* 117 * macros/functions for gaining access to the thread information structure 118 */ 119 #ifndef __ASSEMBLY__ 120 121 #define INIT_THREAD_INFO(tsk) \ 122 { \ 123 .task = &tsk, \ 124 .current_ds = ASI_P, \ 125 .exec_domain = &default_exec_domain, \ 126 .preempt_count = INIT_PREEMPT_COUNT, \ 127 .restart_block = { \ 128 .fn = do_no_restart_syscall, \ 129 }, \ 130 } 131 132 #define init_thread_info (init_thread_union.thread_info) 133 #define init_stack (init_thread_union.stack) 134 135 /* how to get the thread information struct from C */ 136 register struct thread_info *current_thread_info_reg asm("g6"); 137 #define current_thread_info() (current_thread_info_reg) 138 139 /* thread information allocation */ 140 #if PAGE_SHIFT == 13 141 #define THREAD_SIZE_ORDER 1 142 #else /* PAGE_SHIFT == 13 */ 143 #define THREAD_SIZE_ORDER 0 144 #endif /* PAGE_SHIFT == 13 */ 145 146 #define __thread_flag_byte_ptr(ti) \ 147 ((unsigned char *)(&((ti)->flags))) 148 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info()) 149 150 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE]) 151 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val)) 152 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE]) 153 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val)) 154 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP]) 155 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val)) 156 #define get_thread_noerror() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR]) 157 #define set_thread_noerror(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_NOERROR] = (val)) 158 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH]) 159 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val)) 160 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED]) 161 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val)) 162 #endif /* !(__ASSEMBLY__) */ 163 164 /* 165 * Thread information flags, only 16 bits are available as we encode 166 * other values into the upper 6 bytes. 167 * 168 * On trap return we need to test several values: 169 * 170 * user: need_resched, notify_resume, sigpending, wsaved 171 * kernel: fpdepth 172 * 173 * So to check for work in the kernel case we simply load the fpdepth 174 * byte out of the flags and test it. For the user case we encode the 175 * lower 3 bytes of flags as follows: 176 * ---------------------------------------- 177 * | wsaved | flags byte 1 | flags byte 2 | 178 * ---------------------------------------- 179 * This optimizes the user test into: 180 * ldx [%g6 + TI_FLAGS], REG1 181 * sethi %hi(_TIF_USER_WORK_MASK), REG2 182 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2 183 * andcc REG1, REG2, %g0 184 * be,pt no_work_to_do 185 * nop 186 */ 187 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 188 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 189 #define TIF_SIGPENDING 2 /* signal pending */ 190 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 191 /* flag bit 4 is available */ 192 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */ 193 /* flag bit 6 is available */ 194 #define TIF_32BIT 7 /* 32-bit binary */ 195 #define TIF_NOHZ 8 /* in adaptive nohz mode */ 196 #define TIF_SECCOMP 9 /* secure computing */ 197 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */ 198 #define TIF_SYSCALL_TRACEPOINT 11 /* syscall tracepoint instrumentation */ 199 /* NOTE: Thread flags >= 12 should be ones we have no interest 200 * in using in assembly, else we can't use the mask as 201 * an immediate value in instructions such as andcc. 202 */ 203 /* flag bit 12 is available */ 204 #define TIF_MEMDIE 13 /* is terminating due to OOM killer */ 205 #define TIF_POLLING_NRFLAG 14 206 207 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 208 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 209 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 210 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 211 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED) 212 #define _TIF_32BIT (1<<TIF_32BIT) 213 #define _TIF_NOHZ (1<<TIF_NOHZ) 214 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 215 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 216 #define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 217 #define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 218 219 #define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \ 220 _TIF_DO_NOTIFY_RESUME_MASK | \ 221 _TIF_NEED_RESCHED) 222 #define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING) 223 224 #define is_32bit_task() (test_thread_flag(TIF_32BIT)) 225 226 /* 227 * Thread-synchronous status. 228 * 229 * This is different from the flags in that nobody else 230 * ever touches our thread-synchronous status, so we don't 231 * have to worry about atomic accesses. 232 * 233 * Note that there are only 8 bits available. 234 */ 235 #define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */ 236 237 #ifndef __ASSEMBLY__ 238 #define HAVE_SET_RESTORE_SIGMASK 1 239 static inline void set_restore_sigmask(void) 240 { 241 struct thread_info *ti = current_thread_info(); 242 ti->status |= TS_RESTORE_SIGMASK; 243 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags)); 244 } 245 static inline void clear_restore_sigmask(void) 246 { 247 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 248 } 249 static inline bool test_restore_sigmask(void) 250 { 251 return current_thread_info()->status & TS_RESTORE_SIGMASK; 252 } 253 static inline bool test_and_clear_restore_sigmask(void) 254 { 255 struct thread_info *ti = current_thread_info(); 256 if (!(ti->status & TS_RESTORE_SIGMASK)) 257 return false; 258 ti->status &= ~TS_RESTORE_SIGMASK; 259 return true; 260 } 261 262 #define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0) 263 #define test_thread_64bit_stack(__SP) \ 264 ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \ 265 false : true) 266 267 #endif /* !__ASSEMBLY__ */ 268 269 #endif /* __KERNEL__ */ 270 271 #endif /* _ASM_THREAD_INFO_H */ 272