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 0x000004c0 106 #define TI_KUNA_INSN 0x000004c8 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 * preempt_count needs to be 1 initially, until the scheduler is functional. 130 */ 131 #ifndef __ASSEMBLY__ 132 133 #define INIT_THREAD_INFO(tsk) \ 134 { \ 135 .task = &tsk, \ 136 .flags = ((unsigned long)ASI_P) << TI_FLAG_CURRENT_DS_SHIFT, \ 137 .exec_domain = &default_exec_domain, \ 138 .preempt_count = 1, \ 139 .restart_block = { \ 140 .fn = do_no_restart_syscall, \ 141 }, \ 142 } 143 144 #define init_thread_info (init_thread_union.thread_info) 145 #define init_stack (init_thread_union.stack) 146 147 /* how to get the thread information struct from C */ 148 register struct thread_info *current_thread_info_reg asm("g6"); 149 #define current_thread_info() (current_thread_info_reg) 150 151 /* thread information allocation */ 152 #if PAGE_SHIFT == 13 153 #define __THREAD_INFO_ORDER 1 154 #else /* PAGE_SHIFT == 13 */ 155 #define __THREAD_INFO_ORDER 0 156 #endif /* PAGE_SHIFT == 13 */ 157 158 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR 159 160 #ifdef CONFIG_DEBUG_STACK_USAGE 161 #define alloc_thread_info(tsk) \ 162 ({ \ 163 struct thread_info *ret; \ 164 \ 165 ret = (struct thread_info *) \ 166 __get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER); \ 167 if (ret) \ 168 memset(ret, 0, PAGE_SIZE<<__THREAD_INFO_ORDER); \ 169 ret; \ 170 }) 171 #else 172 #define alloc_thread_info(tsk) \ 173 ((struct thread_info *)__get_free_pages(GFP_KERNEL, __THREAD_INFO_ORDER)) 174 #endif 175 176 #define free_thread_info(ti) \ 177 free_pages((unsigned long)(ti),__THREAD_INFO_ORDER) 178 179 #define __thread_flag_byte_ptr(ti) \ 180 ((unsigned char *)(&((ti)->flags))) 181 #define __cur_thread_flag_byte_ptr __thread_flag_byte_ptr(current_thread_info()) 182 183 #define get_thread_fault_code() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE]) 184 #define set_thread_fault_code(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FAULT_CODE] = (val)) 185 #define get_thread_wstate() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE]) 186 #define set_thread_wstate(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSTATE] = (val)) 187 #define get_thread_cwp() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP]) 188 #define set_thread_cwp(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CWP] = (val)) 189 #define get_thread_current_ds() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS]) 190 #define set_thread_current_ds(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_CURRENT_DS] = (val)) 191 #define get_thread_fpdepth() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH]) 192 #define set_thread_fpdepth(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_FPDEPTH] = (val)) 193 #define get_thread_wsaved() (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED]) 194 #define set_thread_wsaved(val) (__cur_thread_flag_byte_ptr[TI_FLAG_BYTE_WSAVED] = (val)) 195 196 #endif /* !(__ASSEMBLY__) */ 197 198 /* 199 * Thread information flags, only 16 bits are available as we encode 200 * other values into the upper 6 bytes. 201 * 202 * On trap return we need to test several values: 203 * 204 * user: need_resched, notify_resume, sigpending, wsaved, perfctr 205 * kernel: fpdepth 206 * 207 * So to check for work in the kernel case we simply load the fpdepth 208 * byte out of the flags and test it. For the user case we encode the 209 * lower 3 bytes of flags as follows: 210 * ---------------------------------------- 211 * | wsaved | flags byte 1 | flags byte 2 | 212 * ---------------------------------------- 213 * This optimizes the user test into: 214 * ldx [%g6 + TI_FLAGS], REG1 215 * sethi %hi(_TIF_USER_WORK_MASK), REG2 216 * or REG2, %lo(_TIF_USER_WORK_MASK), REG2 217 * andcc REG1, REG2, %g0 218 * be,pt no_work_to_do 219 * nop 220 */ 221 #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 222 #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 223 #define TIF_SIGPENDING 2 /* signal pending */ 224 #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 225 #define TIF_PERFCTR 4 /* performance counters active */ 226 #define TIF_UNALIGNED 5 /* allowed to do unaligned accesses */ 227 /* flag bit 6 is available */ 228 #define TIF_32BIT 7 /* 32-bit binary */ 229 /* flag bit 8 is available */ 230 #define TIF_SECCOMP 9 /* secure computing */ 231 #define TIF_SYSCALL_AUDIT 10 /* syscall auditing active */ 232 /* flag bit 11 is available */ 233 /* NOTE: Thread flags >= 12 should be ones we have no interest 234 * in using in assembly, else we can't use the mask as 235 * an immediate value in instructions such as andcc. 236 */ 237 #define TIF_ABI_PENDING 12 238 #define TIF_MEMDIE 13 239 #define TIF_POLLING_NRFLAG 14 240 #define TIF_FREEZE 15 /* is freezing for suspend */ 241 242 #define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE) 243 #define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME) 244 #define _TIF_SIGPENDING (1<<TIF_SIGPENDING) 245 #define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED) 246 #define _TIF_PERFCTR (1<<TIF_PERFCTR) 247 #define _TIF_UNALIGNED (1<<TIF_UNALIGNED) 248 #define _TIF_32BIT (1<<TIF_32BIT) 249 #define _TIF_SECCOMP (1<<TIF_SECCOMP) 250 #define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 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