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-rw-r--r--arch/x86/lib/rwsem.S156
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diff --git a/arch/x86/lib/rwsem.S b/arch/x86/lib/rwsem.S
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-/*
- * x86 semaphore implementation.
- *
- * (C) Copyright 1999 Linus Torvalds
- *
- * Portions Copyright 1999 Red Hat, Inc.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * rw semaphores implemented November 1999 by Benjamin LaHaise <bcrl@kvack.org>
- */
-
-#include <linux/linkage.h>
-#include <asm/alternative-asm.h>
-#include <asm/frame.h>
-
-#define __ASM_HALF_REG(reg) __ASM_SEL(reg, e##reg)
-#define __ASM_HALF_SIZE(inst) __ASM_SEL(inst##w, inst##l)
-
-#ifdef CONFIG_X86_32
-
-/*
- * The semaphore operations have a special calling sequence that
- * allow us to do a simpler in-line version of them. These routines
- * need to convert that sequence back into the C sequence when
- * there is contention on the semaphore.
- *
- * %eax contains the semaphore pointer on entry. Save the C-clobbered
- * registers (%eax, %edx and %ecx) except %eax which is either a return
- * value or just gets clobbered. Same is true for %edx so make sure GCC
- * reloads it after the slow path, by making it hold a temporary, for
- * example see ____down_write().
- */
-
-#define save_common_regs \
- pushl %ecx
-
-#define restore_common_regs \
- popl %ecx
-
- /* Avoid uglifying the argument copying x86-64 needs to do. */
- .macro movq src, dst
- .endm
-
-#else
-
-/*
- * x86-64 rwsem wrappers
- *
- * This interfaces the inline asm code to the slow-path
- * C routines. We need to save the call-clobbered regs
- * that the asm does not mark as clobbered, and move the
- * argument from %rax to %rdi.
- *
- * NOTE! We don't need to save %rax, because the functions
- * will always return the semaphore pointer in %rax (which
- * is also the input argument to these helpers)
- *
- * The following can clobber %rdx because the asm clobbers it:
- * call_rwsem_down_write_failed
- * call_rwsem_wake
- * but %rdi, %rsi, %rcx, %r8-r11 always need saving.
- */
-
-#define save_common_regs \
- pushq %rdi; \
- pushq %rsi; \
- pushq %rcx; \
- pushq %r8; \
- pushq %r9; \
- pushq %r10; \
- pushq %r11
-
-#define restore_common_regs \
- popq %r11; \
- popq %r10; \
- popq %r9; \
- popq %r8; \
- popq %rcx; \
- popq %rsi; \
- popq %rdi
-
-#endif
-
-/* Fix up special calling conventions */
-ENTRY(call_rwsem_down_read_failed)
- FRAME_BEGIN
- save_common_regs
- __ASM_SIZE(push,) %__ASM_REG(dx)
- movq %rax,%rdi
- call rwsem_down_read_failed
- __ASM_SIZE(pop,) %__ASM_REG(dx)
- restore_common_regs
- FRAME_END
- ret
-ENDPROC(call_rwsem_down_read_failed)
-
-ENTRY(call_rwsem_down_read_failed_killable)
- FRAME_BEGIN
- save_common_regs
- __ASM_SIZE(push,) %__ASM_REG(dx)
- movq %rax,%rdi
- call rwsem_down_read_failed_killable
- __ASM_SIZE(pop,) %__ASM_REG(dx)
- restore_common_regs
- FRAME_END
- ret
-ENDPROC(call_rwsem_down_read_failed_killable)
-
-ENTRY(call_rwsem_down_write_failed)
- FRAME_BEGIN
- save_common_regs
- movq %rax,%rdi
- call rwsem_down_write_failed
- restore_common_regs
- FRAME_END
- ret
-ENDPROC(call_rwsem_down_write_failed)
-
-ENTRY(call_rwsem_down_write_failed_killable)
- FRAME_BEGIN
- save_common_regs
- movq %rax,%rdi
- call rwsem_down_write_failed_killable
- restore_common_regs
- FRAME_END
- ret
-ENDPROC(call_rwsem_down_write_failed_killable)
-
-ENTRY(call_rwsem_wake)
- FRAME_BEGIN
- /* do nothing if still outstanding active readers */
- __ASM_HALF_SIZE(dec) %__ASM_HALF_REG(dx)
- jnz 1f
- save_common_regs
- movq %rax,%rdi
- call rwsem_wake
- restore_common_regs
-1: FRAME_END
- ret
-ENDPROC(call_rwsem_wake)
-
-ENTRY(call_rwsem_downgrade_wake)
- FRAME_BEGIN
- save_common_regs
- __ASM_SIZE(push,) %__ASM_REG(dx)
- movq %rax,%rdi
- call rwsem_downgrade_wake
- __ASM_SIZE(pop,) %__ASM_REG(dx)
- restore_common_regs
- FRAME_END
- ret
-ENDPROC(call_rwsem_downgrade_wake)