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![Linus Torvalds](/assets/img/avatar_default.png)
- Convert the 32bit syscalls to be pt_regs based which removes the requirement to push all 6 potential arguments onto the stack and consolidates the interface with the 64bit variant - The first small portion of the exception and syscall related entry code consolidation which aims to address the recently discovered issues vs. RCU, int3, NMI and some other exceptions which can interrupt any context. The bulk of the changes is still work in progress and aimed for 5.8. - A few lockdep namespace cleanups which have been applied into this branch to keep the prerequisites for the ongoing work confined. -----BEGIN PGP SIGNATURE----- iQJHBAABCgAxFiEEQp8+kY+LLUocC4bMphj1TA10mKEFAl6B/TMTHHRnbHhAbGlu dXRyb25peC5kZQAKCRCmGPVMDXSYoYA6EAC7r/bCMxBelljT3b7LkBbiJcocJ+zK OSzWU9miJGTAvYqn4/ciLKg4dA424b/1rBFlF1hBTCQ0HL5Cv4lajxdKEZCO5WCC WWTCz+MC60aWFaH3VNoywiLGb39H2IbqWbS9yNPd/wBkLHiMAD6NPQntOvcPaD4j 1lyrMtLzfrWlrHxvxdI3kt5ZpFLYNXr2xk61xQjTz0ROFQBhf2sDsuhHhiYVLPj7 JwYktpbBiPeaw2+I18NPymNPY+VfY8LCTgLl5M+rbKyCqebKaedZQJ7QXFhAEqKC Y2f+gJsKWtTDzGP2mk/5kF0uP7cd0vJK35ZCXtLZ9BbcNtFZU6w+ADqRo4pJBHRY QRzo/AWrdkuTJF0CrP6mcneNC7NwWLSdKrE1z77RQCHUPVvhHhRDZsgdLcZ/KKwx y1ji22trwNB+7LmI2fUOU5RRHZBIuNvQT+mPt24febJuHpZKul62dd3cqTGeSTC+ MYVknYDSg/+jk+83DhuZnTyb9lWTbq/0Q1HRDu6l2LrMIH7YMPpY5Ea64ZFYzWXy s0+iHEM4mUzltwNauHIntjbwXi3C0l2k1WQyG0gun2eS6SXfu0lb93V4msFj/N1+ oHavH2n2A4XrRr+Ob87fsl7nfXJibWP7R9xPblrWP2sNdqfjSyGd49rnsvpWqWMK Fj0d7tQ78+/SwA== =tWXS -----END PGP SIGNATURE----- Merge tag 'x86-entry-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 entry code updates from Thomas Gleixner: - Convert the 32bit syscalls to be pt_regs based which removes the requirement to push all 6 potential arguments onto the stack and consolidates the interface with the 64bit variant - The first small portion of the exception and syscall related entry code consolidation which aims to address the recently discovered issues vs. RCU, int3, NMI and some other exceptions which can interrupt any context. The bulk of the changes is still work in progress and aimed for 5.8. - A few lockdep namespace cleanups which have been applied into this branch to keep the prerequisites for the ongoing work confined. * tag 'x86-entry-2020-03-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (35 commits) x86/entry: Fix build error x86 with !CONFIG_POSIX_TIMERS lockdep: Rename trace_{hard,soft}{irq_context,irqs_enabled}() lockdep: Rename trace_softirqs_{on,off}() lockdep: Rename trace_hardirq_{enter,exit}() x86/entry: Rename ___preempt_schedule x86: Remove unneeded includes x86/entry: Drop asmlinkage from syscalls x86/entry/32: Enable pt_regs based syscalls x86/entry/32: Use IA32-specific wrappers for syscalls taking 64-bit arguments x86/entry/32: Rename 32-bit specific syscalls x86/entry/32: Clean up syscall_32.tbl x86/entry: Remove ABI prefixes from functions in syscall tables x86/entry/64: Add __SYSCALL_COMMON() x86/entry: Remove syscall qualifier support x86/entry/64: Remove ptregs qualifier from syscall table x86/entry: Move max syscall number calculation to syscallhdr.sh x86/entry/64: Split X32 syscall table into its own file x86/entry/64: Move sys_ni_syscall stub to common.c x86/entry/64: Use syscall wrappers for x32_rt_sigreturn x86/entry: Refactor SYS_NI macros ...
217 lines
6.5 KiB
C
217 lines
6.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* include/linux/irqflags.h
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*
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* IRQ flags tracing: follow the state of the hardirq and softirq flags and
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* provide callbacks for transitions between ON and OFF states.
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*
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* This file gets included from lowlevel asm headers too, to provide
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* wrapped versions of the local_irq_*() APIs, based on the
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* raw_local_irq_*() macros from the lowlevel headers.
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*/
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#ifndef _LINUX_TRACE_IRQFLAGS_H
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#define _LINUX_TRACE_IRQFLAGS_H
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#include <linux/typecheck.h>
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#include <asm/irqflags.h>
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/* Currently lockdep_softirqs_on/off is used only by lockdep */
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#ifdef CONFIG_PROVE_LOCKING
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extern void lockdep_softirqs_on(unsigned long ip);
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extern void lockdep_softirqs_off(unsigned long ip);
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extern void lockdep_hardirqs_on(unsigned long ip);
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extern void lockdep_hardirqs_off(unsigned long ip);
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#else
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static inline void lockdep_softirqs_on(unsigned long ip) { }
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static inline void lockdep_softirqs_off(unsigned long ip) { }
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static inline void lockdep_hardirqs_on(unsigned long ip) { }
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static inline void lockdep_hardirqs_off(unsigned long ip) { }
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#endif
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#ifdef CONFIG_TRACE_IRQFLAGS
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extern void trace_hardirqs_on(void);
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extern void trace_hardirqs_off(void);
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# define lockdep_hardirq_context(p) ((p)->hardirq_context)
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# define lockdep_softirq_context(p) ((p)->softirq_context)
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# define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled)
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# define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
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# define lockdep_hardirq_enter() \
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do { \
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if (!current->hardirq_context++) \
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current->hardirq_threaded = 0; \
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} while (0)
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# define lockdep_hardirq_threaded() \
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do { \
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current->hardirq_threaded = 1; \
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} while (0)
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# define lockdep_hardirq_exit() \
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do { \
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current->hardirq_context--; \
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} while (0)
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# define lockdep_softirq_enter() \
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do { \
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current->softirq_context++; \
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} while (0)
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# define lockdep_softirq_exit() \
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do { \
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current->softirq_context--; \
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} while (0)
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# define lockdep_hrtimer_enter(__hrtimer) \
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do { \
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if (!__hrtimer->is_hard) \
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current->irq_config = 1; \
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} while (0)
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# define lockdep_hrtimer_exit(__hrtimer) \
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do { \
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if (!__hrtimer->is_hard) \
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current->irq_config = 0; \
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} while (0)
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# define lockdep_posixtimer_enter() \
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do { \
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current->irq_config = 1; \
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} while (0)
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# define lockdep_posixtimer_exit() \
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do { \
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current->irq_config = 0; \
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} while (0)
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# define lockdep_irq_work_enter(__work) \
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do { \
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if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
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current->irq_config = 1; \
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} while (0)
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# define lockdep_irq_work_exit(__work) \
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do { \
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if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
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current->irq_config = 0; \
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} while (0)
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#else
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# define trace_hardirqs_on() do { } while (0)
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# define trace_hardirqs_off() do { } while (0)
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# define lockdep_hardirq_context(p) 0
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# define lockdep_softirq_context(p) 0
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# define lockdep_hardirqs_enabled(p) 0
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# define lockdep_softirqs_enabled(p) 0
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# define lockdep_hardirq_enter() do { } while (0)
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# define lockdep_hardirq_threaded() do { } while (0)
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# define lockdep_hardirq_exit() do { } while (0)
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# define lockdep_softirq_enter() do { } while (0)
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# define lockdep_softirq_exit() do { } while (0)
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# define lockdep_hrtimer_enter(__hrtimer) do { } while (0)
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# define lockdep_hrtimer_exit(__hrtimer) do { } while (0)
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# define lockdep_posixtimer_enter() do { } while (0)
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# define lockdep_posixtimer_exit() do { } while (0)
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# define lockdep_irq_work_enter(__work) do { } while (0)
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# define lockdep_irq_work_exit(__work) do { } while (0)
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#endif
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#if defined(CONFIG_IRQSOFF_TRACER) || \
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defined(CONFIG_PREEMPT_TRACER)
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extern void stop_critical_timings(void);
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extern void start_critical_timings(void);
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#else
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# define stop_critical_timings() do { } while (0)
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# define start_critical_timings() do { } while (0)
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#endif
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/*
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* Wrap the arch provided IRQ routines to provide appropriate checks.
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*/
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#define raw_local_irq_disable() arch_local_irq_disable()
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#define raw_local_irq_enable() arch_local_irq_enable()
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#define raw_local_irq_save(flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = arch_local_irq_save(); \
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} while (0)
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#define raw_local_irq_restore(flags) \
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do { \
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typecheck(unsigned long, flags); \
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arch_local_irq_restore(flags); \
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} while (0)
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#define raw_local_save_flags(flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = arch_local_save_flags(); \
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} while (0)
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#define raw_irqs_disabled_flags(flags) \
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({ \
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typecheck(unsigned long, flags); \
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arch_irqs_disabled_flags(flags); \
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})
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#define raw_irqs_disabled() (arch_irqs_disabled())
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#define raw_safe_halt() arch_safe_halt()
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/*
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* The local_irq_*() APIs are equal to the raw_local_irq*()
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* if !TRACE_IRQFLAGS.
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*/
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#ifdef CONFIG_TRACE_IRQFLAGS
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#define local_irq_enable() \
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do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
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#define local_irq_disable() \
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do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
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#define local_irq_save(flags) \
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do { \
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raw_local_irq_save(flags); \
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trace_hardirqs_off(); \
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} while (0)
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#define local_irq_restore(flags) \
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do { \
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if (raw_irqs_disabled_flags(flags)) { \
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raw_local_irq_restore(flags); \
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trace_hardirqs_off(); \
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} else { \
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trace_hardirqs_on(); \
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raw_local_irq_restore(flags); \
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} \
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} while (0)
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#define safe_halt() \
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do { \
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trace_hardirqs_on(); \
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raw_safe_halt(); \
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} while (0)
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#else /* !CONFIG_TRACE_IRQFLAGS */
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#define local_irq_enable() do { raw_local_irq_enable(); } while (0)
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#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
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#define local_irq_save(flags) \
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do { \
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raw_local_irq_save(flags); \
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} while (0)
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#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
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#define safe_halt() do { raw_safe_halt(); } while (0)
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#endif /* CONFIG_TRACE_IRQFLAGS */
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#define local_save_flags(flags) raw_local_save_flags(flags)
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/*
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* Some architectures don't define arch_irqs_disabled(), so even if either
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* definition would be fine we need to use different ones for the time being
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* to avoid build issues.
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*/
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#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
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#define irqs_disabled() \
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({ \
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unsigned long _flags; \
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raw_local_save_flags(_flags); \
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raw_irqs_disabled_flags(_flags); \
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})
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#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
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#define irqs_disabled() raw_irqs_disabled()
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#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
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#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
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#endif
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