Green shading in the line number column means the source is part of the translation unit, red means it is conditionally excluded. Highlighted line numbers link to the translation unit page. Highlighted macros link to the macro page.
1: /* thread_info.h: low-level thread information 2: * 3: * Copyright (C) 2002 David Howells (dhowells@redhat.com) 4: * - Incorporating suggestions made by Linus Torvalds and Dave Miller 5: */ 6: 7: #ifndef _ASM_X86_THREAD_INFO_H 8: #define _ASM_X86_THREAD_INFO_H 9: 10: #include <linux/compiler.h> 11: #include <asm/page.h> 12: #include <asm/types.h> 13: 14: /* 15: * low level task data that entry.S needs immediate access to 16: * - this struct should fit entirely inside of one cache line 17: * - this struct shares the supervisor stack pages 18: */ 19: #ifndef __ASSEMBLY__ 20: struct task_struct; 21: struct exec_domain; 22: #include <asm/processor.h> 23: #include <linux/atomic.h> 24: 25: struct thread_info { 26: struct task_struct *task; /* main task structure */ 27: struct exec_domain *exec_domain; /* execution domain */ 28: __u32 flags; /* low level flags */ 29: __u32 status; /* thread synchronous flags */ 30: __u32 cpu; /* current CPU */ 31: int saved_preempt_count; 32: mm_segment_t addr_limit; 33: struct restart_block restart_block; 34: void __user *sysenter_return; 35: #ifdef CONFIG_X86_32 36: unsigned long previous_esp; /* ESP of the previous stack in 37: case of nested (IRQ) stacks 38: */ 39: __u8 supervisor_stack[0]; 40: #endif 41: unsigned int sig_on_uaccess_error:1; 42: unsigned int uaccess_err:1; /* uaccess failed */ 43: }; 44: 45: #define INIT_THREAD_INFO(tsk) \ 46: { \ 47: .task = &tsk, \ 48: .exec_domain = &default_exec_domain, \ 49: .flags = 0, \ 50: .cpu = 0, \ 51: .saved_preempt_count = INIT_PREEMPT_COUNT, \ 52: .addr_limit = KERNEL_DS, \ 53: .restart_block = { \ 54: .fn = do_no_restart_syscall, \ 55: }, \ 56: } 57: 58: #define init_thread_info (init_thread_union.thread_info) 59: #define init_stack (init_thread_union.stack) 60: 61: #else /* !__ASSEMBLY__ */ 62: 63: #include <asm/asm-offsets.h> 64: 65: #endif 66: 67: /* 68: * thread information flags 69: * - these are process state flags that various assembly files 70: * may need to access 71: * - pending work-to-be-done flags are in LSW 72: * - other flags in MSW 73: * Warning: layout of LSW is hardcoded in entry.S 74: */ 75: #define TIF_SYSCALL_TRACE 0 /* syscall trace active */ 76: #define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ 77: #define TIF_SIGPENDING 2 /* signal pending */ 78: #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ 79: #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ 80: #define TIF_SYSCALL_EMU 6 /* syscall emulation active */ 81: #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ 82: #define TIF_SECCOMP 8 /* secure computing */ 83: #define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */ 84: #define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */ 85: #define TIF_UPROBE 12 /* breakpointed or singlestepping */ 86: #define TIF_NOTSC 16 /* TSC is not accessible in userland */ 87: #define TIF_IA32 17 /* IA32 compatibility process */ 88: #define TIF_FORK 18 /* ret_from_fork */ 89: #define TIF_NOHZ 19 /* in adaptive nohz mode */ 90: #define TIF_MEMDIE 20 /* is terminating due to OOM killer */ 91: #define TIF_IO_BITMAP 22 /* uses I/O bitmap */ 92: #define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ 93: #define TIF_BLOCKSTEP 25 /* set when we want DEBUGCTLMSR_BTF */ 94: #define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */ 95: #define TIF_SYSCALL_TRACEPOINT 28 /* syscall tracepoint instrumentation */ 96: #define TIF_ADDR32 29 /* 32-bit address space on 64 bits */ 97: #define TIF_X32 30 /* 32-bit native x86-64 binary */ 98: 99: #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE) 100: #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) 101: #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) 102: #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) 103: #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) 104: #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) 105: #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) 106: #define _TIF_SECCOMP (1 << TIF_SECCOMP) 107: #define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY) 108: #define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY) 109: #define _TIF_UPROBE (1 << TIF_UPROBE) 110: #define _TIF_NOTSC (1 << TIF_NOTSC) 111: #define _TIF_IA32 (1 << TIF_IA32) 112: #define _TIF_FORK (1 << TIF_FORK) 113: #define _TIF_NOHZ (1 << TIF_NOHZ) 114: #define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP) 115: #define _TIF_FORCED_TF (1 << TIF_FORCED_TF) 116: #define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP) 117: #define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES) 118: #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) 119: #define _TIF_ADDR32 (1 << TIF_ADDR32) 120: #define _TIF_X32 (1 << TIF_X32) 121: 122: /* work to do in syscall_trace_enter() */ 123: #define _TIF_WORK_SYSCALL_ENTRY \ 124: (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | _TIF_SYSCALL_AUDIT | \ 125: _TIF_SECCOMP | _TIF_SINGLESTEP | _TIF_SYSCALL_TRACEPOINT | \ 126: _TIF_NOHZ) 127: 128: /* work to do in syscall_trace_leave() */ 129: #define _TIF_WORK_SYSCALL_EXIT \ 130: (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP | \ 131: _TIF_SYSCALL_TRACEPOINT | _TIF_NOHZ) 132: 133: /* work to do on interrupt/exception return */ 134: #define _TIF_WORK_MASK \ 135: (0x0000FFFF & \ 136: ~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT| \ 137: _TIF_SINGLESTEP|_TIF_SECCOMP|_TIF_SYSCALL_EMU)) 138: 139: /* work to do on any return to user space */ 140: #define _TIF_ALLWORK_MASK \ 141: ((0x0000FFFF & ~_TIF_SECCOMP) | _TIF_SYSCALL_TRACEPOINT | \ 142: _TIF_NOHZ) 143: 144: /* Only used for 64 bit */ 145: #define _TIF_DO_NOTIFY_MASK \ 146: (_TIF_SIGPENDING | _TIF_MCE_NOTIFY | _TIF_NOTIFY_RESUME | \ 147: _TIF_USER_RETURN_NOTIFY) 148: 149: /* flags to check in __switch_to() */ 150: #define _TIF_WORK_CTXSW \ 151: (_TIF_IO_BITMAP|_TIF_NOTSC|_TIF_BLOCKSTEP) 152: 153: #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY) 154: #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW) 155: 156: #ifdef CONFIG_X86_32 157: 158: #define STACK_WARN (THREAD_SIZE/8) 159: /* 160: * macros/functions for gaining access to the thread information structure 161: * 162: * preempt_count needs to be 1 initially, until the scheduler is functional. 163: */ 164: #ifndef __ASSEMBLY__ 165: 166: 167: /* how to get the current stack pointer from C */ 168: register unsigned long current_stack_pointer asm("esp") __used; 169: 170: /* how to get the thread information struct from C */ 171: static inline struct thread_info *current_thread_info(void) 172: { 173: return (struct thread_info *) 174: (current_stack_pointer & ~(THREAD_SIZE - 1)); 175: } 176: 177: #else /* !__ASSEMBLY__ */ 178: 179: /* how to get the thread information struct from ASM */ 180: #define GET_THREAD_INFO(reg) \ 181: movl $-THREAD_SIZE, reg; \ 182: andl %esp, reg 183: 184: /* use this one if reg already contains %esp */ 185: #define GET_THREAD_INFO_WITH_ESP(reg) \ 186: andl $-THREAD_SIZE, reg 187: 188: #endif 189: 190: #else /* X86_32 */ 191: 192: #include <asm/percpu.h> 193: #define KERNEL_STACK_OFFSET (5*8) 194: 195: /* 196: * macros/functions for gaining access to the thread information structure 197: * preempt_count needs to be 1 initially, until the scheduler is functional. 198: */ 199: #ifndef __ASSEMBLY__ 200: DECLARE_PER_CPU(unsigned long, kernel_stack); 201: 202: static inline struct thread_info *current_thread_info(void) 203: { 204: struct thread_info *ti; 205: ti = (void *)(this_cpu_read_stable(kernel_stack) + 206: KERNEL_STACK_OFFSET - THREAD_SIZE); 207: return ti; 208: } 209: 210: #else /* !__ASSEMBLY__ */ 211: 212: /* how to get the thread information struct from ASM */ 213: #define GET_THREAD_INFO(reg) \ 214: movq PER_CPU_VAR(kernel_stack),reg ; \ 215: subq $(THREAD_SIZE-KERNEL_STACK_OFFSET),reg 216: 217: /* 218: * Same if PER_CPU_VAR(kernel_stack) is, perhaps with some offset, already in 219: * a certain register (to be used in assembler memory operands). 220: */ 221: #define THREAD_INFO(reg, off) KERNEL_STACK_OFFSET+(off)-THREAD_SIZE(reg) 222: 223: #endif 224: 225: #endif /* !X86_32 */ 226: 227: /* 228: * Thread-synchronous status. 229: * 230: * This is different from the flags in that nobody else 231: * ever touches our thread-synchronous status, so we don't 232: * have to worry about atomic accesses. 233: */ 234: #define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/ 235: #define TS_POLLING 0x0004 /* idle task polling need_resched, 236: skip sending interrupt */ 237: #define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */ 238: 239: #ifndef __ASSEMBLY__ 240: #define HAVE_SET_RESTORE_SIGMASK 1 241: static inline void set_restore_sigmask(void) 242: { 243: struct thread_info *ti = current_thread_info(); 244: ti->status |= TS_RESTORE_SIGMASK; 245: WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags)); 246: } 247: static inline void clear_restore_sigmask(void) 248: { 249: current_thread_info()->status &= ~TS_RESTORE_SIGMASK; 250: } 251: static inline bool test_restore_sigmask(void) 252: { 253: return current_thread_info()->status & TS_RESTORE_SIGMASK; 254: } 255: static inline bool test_and_clear_restore_sigmask(void) 256: { 257: struct thread_info *ti = current_thread_info(); 258: if (!(ti->status & TS_RESTORE_SIGMASK)) 259: return false; 260: ti->status &= ~TS_RESTORE_SIGMASK; 261: return true; 262: } 263: 264: static inline bool is_ia32_task(void) 265: { 266: #ifdef CONFIG_X86_32 267: return true; 268: #endif 269: #ifdef CONFIG_IA32_EMULATION 270: if (current_thread_info()->status & TS_COMPAT) 271: return true; 272: #endif 273: return false; 274: } 275: #endif /* !__ASSEMBLY__ */ 276: 277: #ifndef __ASSEMBLY__ 278: extern void arch_task_cache_init(void); 279: extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 280: extern void arch_release_task_struct(struct task_struct *tsk); 281: #endif 282: #endif /* _ASM_X86_THREAD_INFO_H */ 283: