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 33struct task_struct; 34struct exec_domain; 35 36struct 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[0] __attribute__ ((aligned(64))); 67}; 68 69#endif /* !(__ASSEMBLY__) */ 70 71/* offsets into the thread_info struct for assembly code access */ 72#define TI_TASK 0x00000000 73#define TI_FLAGS 0x00000008 74#define TI_FAULT_CODE (TI_FLAGS + TI_FLAG_BYTE_FAULT_CODE) 75#define TI_WSTATE (TI_FLAGS + TI_FLAG_BYTE_WSTATE) 76#define TI_CWP (TI_FLAGS + TI_FLAG_BYTE_CWP) 77#define TI_FPDEPTH (TI_FLAGS + TI_FLAG_BYTE_FPDEPTH) 78#define TI_WSAVED (TI_FLAGS + TI_FLAG_BYTE_WSAVED) 79#define TI_SYS_NOERROR (TI_FLAGS + TI_FLAG_BYTE_NOERROR) 80#define TI_FPSAVED 0x00000010 81#define TI_KSP 0x00000018 82#define TI_FAULT_ADDR 0x00000020 83#define TI_KREGS 0x00000028 84#define TI_EXEC_DOMAIN 0x00000030 85#define TI_PRE_COUNT 0x00000038 86#define TI_NEW_CHILD 0x0000003c 87#define TI_CURRENT_DS 0x0000003d 88#define TI_CPU 0x0000003e 89#define TI_UTRAPS 0x00000040 90#define TI_REG_WINDOW 0x00000048 91#define TI_RWIN_SPTRS 0x000003c8 92#define TI_GSR 0x00000400 93#define TI_XFSR 0x00000438 94#define TI_RESTART_BLOCK 0x00000470 95#define TI_KUNA_REGS 0x000004a0 96#define TI_KUNA_INSN 0x000004a8 97#define TI_FPREGS 0x000004c0 98 99/* We embed this in the uppermost byte of thread_info->flags */ 100#define FAULT_CODE_WRITE 0x01 /* Write access, implies D-TLB */ 101#define FAULT_CODE_DTLB 0x02 /* Miss happened in D-TLB */ 102#define FAULT_CODE_ITLB 0x04 /* Miss happened in I-TLB */ 103#define FAULT_CODE_WINFIXUP 0x08 /* Miss happened during spill/fill */ 104#define FAULT_CODE_BLKCOMMIT 0x10 /* Use blk-commit ASI in copy_page */ 105 106#if PAGE_SHIFT == 13 107#define THREAD_SIZE (2*PAGE_SIZE) 108#define THREAD_SHIFT (PAGE_SHIFT + 1) 109#else /* PAGE_SHIFT == 13 */ 110#define THREAD_SIZE PAGE_SIZE 111#define THREAD_SHIFT PAGE_SHIFT 112#endif /* PAGE_SHIFT == 13 */ 113 114#define PREEMPT_ACTIVE 0x10000000 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 */ 136register 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/* flag bit 8 is available */ 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_SECCOMP (1<<TIF_SECCOMP) 214#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT) 215#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT) 216#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG) 217 218#define _TIF_USER_WORK_MASK ((0xff << TI_FLAG_WSAVED_SHIFT) | \ 219 _TIF_DO_NOTIFY_RESUME_MASK | \ 220 _TIF_NEED_RESCHED) 221#define _TIF_DO_NOTIFY_RESUME_MASK (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING) 222 223/* 224 * Thread-synchronous status. 225 * 226 * This is different from the flags in that nobody else 227 * ever touches our thread-synchronous status, so we don't 228 * have to worry about atomic accesses. 229 * 230 * Note that there are only 8 bits available. 231 */ 232#define TS_RESTORE_SIGMASK 0x0001 /* restore signal mask in do_signal() */ 233 234#ifndef __ASSEMBLY__ 235#define HAVE_SET_RESTORE_SIGMASK 1 236static inline void set_restore_sigmask(void) 237{ 238 struct thread_info *ti = current_thread_info(); 239 ti->status |= TS_RESTORE_SIGMASK; 240 WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags)); 241} 242static inline void clear_restore_sigmask(void) 243{ 244 current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 245} 246static inline bool test_restore_sigmask(void) 247{ 248 return current_thread_info()->status & TS_RESTORE_SIGMASK; 249} 250static inline bool test_and_clear_restore_sigmask(void) 251{ 252 struct thread_info *ti = current_thread_info(); 253 if (!(ti->status & TS_RESTORE_SIGMASK)) 254 return false; 255 ti->status &= ~TS_RESTORE_SIGMASK; 256 return true; 257} 258 259#define thread32_stack_is_64bit(__SP) (((__SP) & 0x1) != 0) 260#define test_thread_64bit_stack(__SP) \ 261 ((test_thread_flag(TIF_32BIT) && !thread32_stack_is_64bit(__SP)) ? \ 262 false : true) 263 264#endif /* !__ASSEMBLY__ */ 265 266#endif /* __KERNEL__ */ 267 268#endif /* _ASM_THREAD_INFO_H */ 269