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240 lines
7.8 KiB
240 lines
7.8 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* thread_info.h: low-level thread information |
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* |
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* Copyright (C) 2002 David Howells ([email protected]) |
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* - Incorporating suggestions made by Linus Torvalds and Dave Miller |
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*/ |
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#ifndef _ASM_X86_THREAD_INFO_H |
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#define _ASM_X86_THREAD_INFO_H |
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#include <linux/compiler.h> |
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#include <asm/page.h> |
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#include <asm/percpu.h> |
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#include <asm/types.h> |
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/* |
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* TOP_OF_KERNEL_STACK_PADDING is a number of unused bytes that we |
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* reserve at the top of the kernel stack. We do it because of a nasty |
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* 32-bit corner case. On x86_32, the hardware stack frame is |
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* variable-length. Except for vm86 mode, struct pt_regs assumes a |
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* maximum-length frame. If we enter from CPL 0, the top 8 bytes of |
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* pt_regs don't actually exist. Ordinarily this doesn't matter, but it |
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* does in at least one case: |
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* |
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* If we take an NMI early enough in SYSENTER, then we can end up with |
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* pt_regs that extends above sp0. On the way out, in the espfix code, |
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* we can read the saved SS value, but that value will be above sp0. |
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* Without this offset, that can result in a page fault. (We are |
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* careful that, in this case, the value we read doesn't matter.) |
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* |
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* In vm86 mode, the hardware frame is much longer still, so add 16 |
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* bytes to make room for the real-mode segments. |
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* |
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* x86_64 has a fixed-length stack frame. |
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*/ |
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#ifdef CONFIG_X86_32 |
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# ifdef CONFIG_VM86 |
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# define TOP_OF_KERNEL_STACK_PADDING 16 |
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# else |
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# define TOP_OF_KERNEL_STACK_PADDING 8 |
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# endif |
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#else |
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# define TOP_OF_KERNEL_STACK_PADDING 0 |
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#endif |
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/* |
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* low level task data that entry.S needs immediate access to |
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* - this struct should fit entirely inside of one cache line |
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* - this struct shares the supervisor stack pages |
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*/ |
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#ifndef __ASSEMBLY__ |
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struct task_struct; |
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#include <asm/cpufeature.h> |
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#include <linux/atomic.h> |
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struct thread_info { |
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unsigned long flags; /* low level flags */ |
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unsigned long syscall_work; /* SYSCALL_WORK_ flags */ |
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u32 status; /* thread synchronous flags */ |
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}; |
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#define INIT_THREAD_INFO(tsk) \ |
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{ \ |
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.flags = 0, \ |
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} |
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#else /* !__ASSEMBLY__ */ |
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#include <asm/asm-offsets.h> |
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#endif |
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/* |
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* thread information flags |
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* - these are process state flags that various assembly files |
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* may need to access |
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*/ |
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#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */ |
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#define TIF_SIGPENDING 2 /* signal pending */ |
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#define TIF_NEED_RESCHED 3 /* rescheduling necessary */ |
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#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ |
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#define TIF_SSBD 5 /* Speculative store bypass disable */ |
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#define TIF_SPEC_IB 9 /* Indirect branch speculation mitigation */ |
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#define TIF_SPEC_FORCE_UPDATE 10 /* Force speculation MSR update in context switch */ |
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#define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */ |
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#define TIF_UPROBE 12 /* breakpointed or singlestepping */ |
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#define TIF_PATCH_PENDING 13 /* pending live patching update */ |
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#define TIF_NEED_FPU_LOAD 14 /* load FPU on return to userspace */ |
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#define TIF_NOCPUID 15 /* CPUID is not accessible in userland */ |
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#define TIF_NOTSC 16 /* TSC is not accessible in userland */ |
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#define TIF_NOTIFY_SIGNAL 17 /* signal notifications exist */ |
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#define TIF_SLD 18 /* Restore split lock detection on context switch */ |
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#define TIF_MEMDIE 20 /* is terminating due to OOM killer */ |
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#define TIF_POLLING_NRFLAG 21 /* idle is polling for TIF_NEED_RESCHED */ |
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#define TIF_IO_BITMAP 22 /* uses I/O bitmap */ |
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#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */ |
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#define TIF_BLOCKSTEP 25 /* set when we want DEBUGCTLMSR_BTF */ |
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#define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */ |
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#define TIF_ADDR32 29 /* 32-bit address space on 64 bits */ |
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#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) |
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) |
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) |
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#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) |
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#define _TIF_SSBD (1 << TIF_SSBD) |
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#define _TIF_SPEC_IB (1 << TIF_SPEC_IB) |
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#define _TIF_SPEC_FORCE_UPDATE (1 << TIF_SPEC_FORCE_UPDATE) |
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#define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY) |
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#define _TIF_UPROBE (1 << TIF_UPROBE) |
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#define _TIF_PATCH_PENDING (1 << TIF_PATCH_PENDING) |
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#define _TIF_NEED_FPU_LOAD (1 << TIF_NEED_FPU_LOAD) |
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#define _TIF_NOCPUID (1 << TIF_NOCPUID) |
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#define _TIF_NOTSC (1 << TIF_NOTSC) |
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#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) |
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#define _TIF_SLD (1 << TIF_SLD) |
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#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) |
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#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP) |
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#define _TIF_FORCED_TF (1 << TIF_FORCED_TF) |
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#define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP) |
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#define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES) |
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#define _TIF_ADDR32 (1 << TIF_ADDR32) |
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/* flags to check in __switch_to() */ |
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#define _TIF_WORK_CTXSW_BASE \ |
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(_TIF_NOCPUID | _TIF_NOTSC | _TIF_BLOCKSTEP | \ |
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_TIF_SSBD | _TIF_SPEC_FORCE_UPDATE | _TIF_SLD) |
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/* |
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* Avoid calls to __switch_to_xtra() on UP as STIBP is not evaluated. |
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*/ |
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#ifdef CONFIG_SMP |
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# define _TIF_WORK_CTXSW (_TIF_WORK_CTXSW_BASE | _TIF_SPEC_IB) |
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#else |
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# define _TIF_WORK_CTXSW (_TIF_WORK_CTXSW_BASE) |
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#endif |
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#ifdef CONFIG_X86_IOPL_IOPERM |
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# define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW| _TIF_USER_RETURN_NOTIFY | \ |
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_TIF_IO_BITMAP) |
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#else |
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# define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW| _TIF_USER_RETURN_NOTIFY) |
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#endif |
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#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW) |
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#define STACK_WARN (THREAD_SIZE/8) |
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/* |
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* macros/functions for gaining access to the thread information structure |
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* |
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* preempt_count needs to be 1 initially, until the scheduler is functional. |
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*/ |
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#ifndef __ASSEMBLY__ |
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/* |
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* Walks up the stack frames to make sure that the specified object is |
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* entirely contained by a single stack frame. |
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* |
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* Returns: |
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* GOOD_FRAME if within a frame |
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* BAD_STACK if placed across a frame boundary (or outside stack) |
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* NOT_STACK unable to determine (no frame pointers, etc) |
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*/ |
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static inline int arch_within_stack_frames(const void * const stack, |
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const void * const stackend, |
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const void *obj, unsigned long len) |
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{ |
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#if defined(CONFIG_FRAME_POINTER) |
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const void *frame = NULL; |
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const void *oldframe; |
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oldframe = __builtin_frame_address(1); |
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if (oldframe) |
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frame = __builtin_frame_address(2); |
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/* |
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* low ----------------------------------------------> high |
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* [saved bp][saved ip][args][local vars][saved bp][saved ip] |
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* ^----------------^ |
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* allow copies only within here |
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*/ |
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while (stack <= frame && frame < stackend) { |
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/* |
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* If obj + len extends past the last frame, this |
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* check won't pass and the next frame will be 0, |
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* causing us to bail out and correctly report |
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* the copy as invalid. |
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*/ |
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if (obj + len <= frame) |
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return obj >= oldframe + 2 * sizeof(void *) ? |
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GOOD_FRAME : BAD_STACK; |
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oldframe = frame; |
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frame = *(const void * const *)frame; |
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} |
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return BAD_STACK; |
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#else |
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return NOT_STACK; |
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#endif |
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} |
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#else /* !__ASSEMBLY__ */ |
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#ifdef CONFIG_X86_64 |
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# define cpu_current_top_of_stack (cpu_tss_rw + TSS_sp1) |
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#endif |
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#endif |
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/* |
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* Thread-synchronous status. |
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* |
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* This is different from the flags in that nobody else |
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* ever touches our thread-synchronous status, so we don't |
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* have to worry about atomic accesses. |
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*/ |
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#define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/ |
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#ifndef __ASSEMBLY__ |
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#ifdef CONFIG_COMPAT |
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#define TS_I386_REGS_POKED 0x0004 /* regs poked by 32-bit ptracer */ |
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#define arch_set_restart_data(restart) \ |
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do { restart->arch_data = current_thread_info()->status; } while (0) |
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#endif |
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#ifdef CONFIG_X86_32 |
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#define in_ia32_syscall() true |
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#else |
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#define in_ia32_syscall() (IS_ENABLED(CONFIG_IA32_EMULATION) && \ |
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current_thread_info()->status & TS_COMPAT) |
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#endif |
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extern void arch_task_cache_init(void); |
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extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); |
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extern void arch_release_task_struct(struct task_struct *tsk); |
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extern void arch_setup_new_exec(void); |
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#define arch_setup_new_exec arch_setup_new_exec |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* _ASM_X86_THREAD_INFO_H */
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