mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
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168829ad09
Pull locking updates from Ingo Molnar:
"The main changes in this cycle were:
- A comprehensive rewrite of the robust/PI futex code's exit handling
to fix various exit races. (Thomas Gleixner et al)
- Rework the generic REFCOUNT_FULL implementation using
atomic_fetch_* operations so that the performance impact of the
cmpxchg() loops is mitigated for common refcount operations.
With these performance improvements the generic implementation of
refcount_t should be good enough for everybody - and this got
confirmed by performance testing, so remove ARCH_HAS_REFCOUNT and
REFCOUNT_FULL entirely, leaving the generic implementation enabled
unconditionally. (Will Deacon)
- Other misc changes, fixes, cleanups"
* 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits)
lkdtm: Remove references to CONFIG_REFCOUNT_FULL
locking/refcount: Remove unused 'refcount_error_report()' function
locking/refcount: Consolidate implementations of refcount_t
locking/refcount: Consolidate REFCOUNT_{MAX,SATURATED} definitions
locking/refcount: Move saturation warnings out of line
locking/refcount: Improve performance of generic REFCOUNT_FULL code
locking/refcount: Move the bulk of the REFCOUNT_FULL implementation into the <linux/refcount.h> header
locking/refcount: Remove unused refcount_*_checked() variants
locking/refcount: Ensure integer operands are treated as signed
locking/refcount: Define constants for saturation and max refcount values
futex: Prevent exit livelock
futex: Provide distinct return value when owner is exiting
futex: Add mutex around futex exit
futex: Provide state handling for exec() as well
futex: Sanitize exit state handling
futex: Mark the begin of futex exit explicitly
futex: Set task::futex_state to DEAD right after handling futex exit
futex: Split futex_mm_release() for exit/exec
exit/exec: Seperate mm_release()
futex: Replace PF_EXITPIDONE with a state
...
187 lines
4.6 KiB
C
187 lines
4.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_ASM_H
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#define _ASM_X86_ASM_H
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#ifdef __ASSEMBLY__
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# define __ASM_FORM(x) x
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# define __ASM_FORM_RAW(x) x
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# define __ASM_FORM_COMMA(x) x,
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#else
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#include <linux/stringify.h>
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# define __ASM_FORM(x) " " __stringify(x) " "
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# define __ASM_FORM_RAW(x) __stringify(x)
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# define __ASM_FORM_COMMA(x) " " __stringify(x) ","
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#endif
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#ifndef __x86_64__
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/* 32 bit */
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# define __ASM_SEL(a,b) __ASM_FORM(a)
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# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
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#else
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/* 64 bit */
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# define __ASM_SEL(a,b) __ASM_FORM(b)
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# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
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#endif
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#define __ASM_SIZE(inst, ...) __ASM_SEL(inst##l##__VA_ARGS__, \
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inst##q##__VA_ARGS__)
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#define __ASM_REG(reg) __ASM_SEL_RAW(e##reg, r##reg)
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#define _ASM_PTR __ASM_SEL(.long, .quad)
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#define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8)
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#define _ASM_MOV __ASM_SIZE(mov)
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#define _ASM_INC __ASM_SIZE(inc)
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#define _ASM_DEC __ASM_SIZE(dec)
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#define _ASM_ADD __ASM_SIZE(add)
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#define _ASM_SUB __ASM_SIZE(sub)
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#define _ASM_XADD __ASM_SIZE(xadd)
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#define _ASM_MUL __ASM_SIZE(mul)
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#define _ASM_AX __ASM_REG(ax)
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#define _ASM_BX __ASM_REG(bx)
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#define _ASM_CX __ASM_REG(cx)
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#define _ASM_DX __ASM_REG(dx)
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#define _ASM_SP __ASM_REG(sp)
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#define _ASM_BP __ASM_REG(bp)
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#define _ASM_SI __ASM_REG(si)
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#define _ASM_DI __ASM_REG(di)
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#ifndef __x86_64__
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/* 32 bit */
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#define _ASM_ARG1 _ASM_AX
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#define _ASM_ARG2 _ASM_DX
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#define _ASM_ARG3 _ASM_CX
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#define _ASM_ARG1L eax
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#define _ASM_ARG2L edx
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#define _ASM_ARG3L ecx
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#define _ASM_ARG1W ax
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#define _ASM_ARG2W dx
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#define _ASM_ARG3W cx
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#define _ASM_ARG1B al
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#define _ASM_ARG2B dl
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#define _ASM_ARG3B cl
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#else
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/* 64 bit */
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#define _ASM_ARG1 _ASM_DI
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#define _ASM_ARG2 _ASM_SI
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#define _ASM_ARG3 _ASM_DX
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#define _ASM_ARG4 _ASM_CX
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#define _ASM_ARG5 r8
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#define _ASM_ARG6 r9
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#define _ASM_ARG1Q rdi
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#define _ASM_ARG2Q rsi
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#define _ASM_ARG3Q rdx
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#define _ASM_ARG4Q rcx
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#define _ASM_ARG5Q r8
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#define _ASM_ARG6Q r9
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#define _ASM_ARG1L edi
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#define _ASM_ARG2L esi
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#define _ASM_ARG3L edx
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#define _ASM_ARG4L ecx
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#define _ASM_ARG5L r8d
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#define _ASM_ARG6L r9d
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#define _ASM_ARG1W di
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#define _ASM_ARG2W si
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#define _ASM_ARG3W dx
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#define _ASM_ARG4W cx
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#define _ASM_ARG5W r8w
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#define _ASM_ARG6W r9w
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#define _ASM_ARG1B dil
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#define _ASM_ARG2B sil
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#define _ASM_ARG3B dl
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#define _ASM_ARG4B cl
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#define _ASM_ARG5B r8b
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#define _ASM_ARG6B r9b
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#endif
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/*
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* Macros to generate condition code outputs from inline assembly,
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* The output operand must be type "bool".
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*/
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#ifdef __GCC_ASM_FLAG_OUTPUTS__
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# define CC_SET(c) "\n\t/* output condition code " #c "*/\n"
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# define CC_OUT(c) "=@cc" #c
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#else
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# define CC_SET(c) "\n\tset" #c " %[_cc_" #c "]\n"
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# define CC_OUT(c) [_cc_ ## c] "=qm"
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#endif
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/* Exception table entry */
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#ifdef __ASSEMBLY__
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# define _ASM_EXTABLE_HANDLE(from, to, handler) \
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.pushsection "__ex_table","a" ; \
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.balign 4 ; \
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.long (from) - . ; \
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.long (to) - . ; \
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.long (handler) - . ; \
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.popsection
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# define _ASM_EXTABLE(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
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# define _ASM_EXTABLE_UA(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
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# define _ASM_EXTABLE_FAULT(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
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# define _ASM_EXTABLE_EX(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
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# define _ASM_NOKPROBE(entry) \
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.pushsection "_kprobe_blacklist","aw" ; \
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_ASM_ALIGN ; \
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_ASM_PTR (entry); \
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.popsection
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#else
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# define _EXPAND_EXTABLE_HANDLE(x) #x
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# define _ASM_EXTABLE_HANDLE(from, to, handler) \
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" .pushsection \"__ex_table\",\"a\"\n" \
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" .balign 4\n" \
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" .long (" #from ") - .\n" \
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" .long (" #to ") - .\n" \
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" .long (" _EXPAND_EXTABLE_HANDLE(handler) ") - .\n" \
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" .popsection\n"
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# define _ASM_EXTABLE(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_default)
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# define _ASM_EXTABLE_UA(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_uaccess)
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# define _ASM_EXTABLE_FAULT(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
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# define _ASM_EXTABLE_EX(from, to) \
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_ASM_EXTABLE_HANDLE(from, to, ex_handler_ext)
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/* For C file, we already have NOKPROBE_SYMBOL macro */
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#endif
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#ifndef __ASSEMBLY__
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/*
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* This output constraint should be used for any inline asm which has a "call"
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* instruction. Otherwise the asm may be inserted before the frame pointer
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* gets set up by the containing function. If you forget to do this, objtool
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* may print a "call without frame pointer save/setup" warning.
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*/
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register unsigned long current_stack_pointer asm(_ASM_SP);
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#define ASM_CALL_CONSTRAINT "+r" (current_stack_pointer)
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#endif
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#endif /* _ASM_X86_ASM_H */
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