145 lines
3.4 KiB
ArmAsm
145 lines
3.4 KiB
ArmAsm
/*
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* x86 semaphore implementation.
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*
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* (C) Copyright 1999 Linus Torvalds
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*
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* Portions Copyright 1999 Red Hat, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* rw semaphores implemented November 1999 by Benjamin LaHaise <bcrl@kvack.org>
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*/
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#include <linux/linkage.h>
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#include <asm/alternative-asm.h>
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#include <asm/frame.h>
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#define __ASM_HALF_REG(reg) __ASM_SEL(reg, e##reg)
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#define __ASM_HALF_SIZE(inst) __ASM_SEL(inst##w, inst##l)
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#ifdef CONFIG_X86_32
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/*
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* The semaphore operations have a special calling sequence that
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* allow us to do a simpler in-line version of them. These routines
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* need to convert that sequence back into the C sequence when
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* there is contention on the semaphore.
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*
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* %eax contains the semaphore pointer on entry. Save the C-clobbered
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* registers (%eax, %edx and %ecx) except %eax which is either a return
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* value or just gets clobbered. Same is true for %edx so make sure GCC
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* reloads it after the slow path, by making it hold a temporary, for
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* example see ____down_write().
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*/
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#define save_common_regs \
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pushl %ecx
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#define restore_common_regs \
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popl %ecx
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/* Avoid uglifying the argument copying x86-64 needs to do. */
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.macro movq src, dst
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.endm
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#else
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/*
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* x86-64 rwsem wrappers
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*
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* This interfaces the inline asm code to the slow-path
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* C routines. We need to save the call-clobbered regs
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* that the asm does not mark as clobbered, and move the
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* argument from %rax to %rdi.
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*
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* NOTE! We don't need to save %rax, because the functions
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* will always return the semaphore pointer in %rax (which
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* is also the input argument to these helpers)
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*
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* The following can clobber %rdx because the asm clobbers it:
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* call_rwsem_down_write_failed
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* call_rwsem_wake
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* but %rdi, %rsi, %rcx, %r8-r11 always need saving.
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*/
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#define save_common_regs \
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pushq %rdi; \
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pushq %rsi; \
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pushq %rcx; \
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pushq %r8; \
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pushq %r9; \
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pushq %r10; \
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pushq %r11
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#define restore_common_regs \
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popq %r11; \
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popq %r10; \
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popq %r9; \
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popq %r8; \
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popq %rcx; \
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popq %rsi; \
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popq %rdi
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#endif
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/* Fix up special calling conventions */
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ENTRY(call_rwsem_down_read_failed)
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FRAME_BEGIN
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save_common_regs
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__ASM_SIZE(push,) %__ASM_REG(dx)
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movq %rax,%rdi
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call rwsem_down_read_failed
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__ASM_SIZE(pop,) %__ASM_REG(dx)
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restore_common_regs
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FRAME_END
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ret
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ENDPROC(call_rwsem_down_read_failed)
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ENTRY(call_rwsem_down_write_failed)
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FRAME_BEGIN
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save_common_regs
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movq %rax,%rdi
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call rwsem_down_write_failed
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restore_common_regs
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FRAME_END
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ret
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ENDPROC(call_rwsem_down_write_failed)
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ENTRY(call_rwsem_down_write_failed_killable)
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FRAME_BEGIN
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save_common_regs
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movq %rax,%rdi
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call rwsem_down_write_failed_killable
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restore_common_regs
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FRAME_END
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ret
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ENDPROC(call_rwsem_down_write_failed_killable)
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ENTRY(call_rwsem_wake)
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FRAME_BEGIN
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/* do nothing if still outstanding active readers */
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__ASM_HALF_SIZE(dec) %__ASM_HALF_REG(dx)
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jnz 1f
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save_common_regs
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movq %rax,%rdi
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call rwsem_wake
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restore_common_regs
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1: FRAME_END
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ret
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ENDPROC(call_rwsem_wake)
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ENTRY(call_rwsem_downgrade_wake)
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FRAME_BEGIN
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save_common_regs
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__ASM_SIZE(push,) %__ASM_REG(dx)
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movq %rax,%rdi
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call rwsem_downgrade_wake
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__ASM_SIZE(pop,) %__ASM_REG(dx)
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restore_common_regs
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FRAME_END
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ret
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ENDPROC(call_rwsem_downgrade_wake)
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