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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [x86/] [lib/] [semaphore_32.S] - Blame information for rev 3

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Line No. Rev Author Line
1 3 xianfeng 
/*
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 * i386 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
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 */
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#include
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#include
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#include
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#include
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#include
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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 whish is either a return
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 * value or just clobbered..
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 */
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        .section .sched.text
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ENTRY(__down_failed)
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        CFI_STARTPROC
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        FRAME
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        pushl %edx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET edx,0
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        pushl %ecx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET ecx,0
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        call __down
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        popl %ecx
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        CFI_ADJUST_CFA_OFFSET -4
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        CFI_RESTORE ecx
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        popl %edx
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        CFI_ADJUST_CFA_OFFSET -4
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        CFI_RESTORE edx
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        ENDFRAME
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        ret
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        CFI_ENDPROC
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        END(__down_failed)
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ENTRY(__down_failed_interruptible)
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        CFI_STARTPROC
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        FRAME
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        pushl %edx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET edx,0
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        pushl %ecx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET ecx,0
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        call __down_interruptible
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        popl %ecx
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        CFI_ADJUST_CFA_OFFSET -4
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        CFI_RESTORE ecx
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        popl %edx
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        CFI_ADJUST_CFA_OFFSET -4
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        CFI_RESTORE edx
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        ENDFRAME
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        ret
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        CFI_ENDPROC
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        END(__down_failed_interruptible)
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ENTRY(__down_failed_trylock)
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        CFI_STARTPROC
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        FRAME
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        pushl %edx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET edx,0
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        pushl %ecx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET ecx,0
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        call __down_trylock
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        popl %ecx
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        CFI_ADJUST_CFA_OFFSET -4
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        CFI_RESTORE ecx
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        popl %edx
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        CFI_ADJUST_CFA_OFFSET -4
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        CFI_RESTORE edx
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        ENDFRAME
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        ret
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        CFI_ENDPROC
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        END(__down_failed_trylock)
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ENTRY(__up_wakeup)
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        CFI_STARTPROC
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        FRAME
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        pushl %edx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET edx,0
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        pushl %ecx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET ecx,0
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        call __up
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        popl %ecx
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        CFI_ADJUST_CFA_OFFSET -4
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        CFI_RESTORE ecx
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        popl %edx
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        CFI_ADJUST_CFA_OFFSET -4
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        CFI_RESTORE edx
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        ENDFRAME
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        ret
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        CFI_ENDPROC
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        END(__up_wakeup)
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/*
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 * rw spinlock fallbacks
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 */
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#ifdef CONFIG_SMP
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ENTRY(__write_lock_failed)
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        CFI_STARTPROC simple
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        FRAME
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2:      LOCK_PREFIX
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        addl    $ RW_LOCK_BIAS,(%eax)
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1:      rep; nop
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        cmpl    $ RW_LOCK_BIAS,(%eax)
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        jne     1b
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        LOCK_PREFIX
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        subl    $ RW_LOCK_BIAS,(%eax)
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        jnz     2b
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        ENDFRAME
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        ret
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        CFI_ENDPROC
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        END(__write_lock_failed)
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ENTRY(__read_lock_failed)
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        CFI_STARTPROC
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        FRAME
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2:      LOCK_PREFIX
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        incl    (%eax)
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1:      rep; nop
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        cmpl    $1,(%eax)
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        js      1b
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        LOCK_PREFIX
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        decl    (%eax)
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        js      2b
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        ENDFRAME
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        ret
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        CFI_ENDPROC
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        END(__read_lock_failed)
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#endif
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#ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
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/* Fix up special calling conventions */
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ENTRY(call_rwsem_down_read_failed)
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        CFI_STARTPROC
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        push %ecx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET ecx,0
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        push %edx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET edx,0
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        call rwsem_down_read_failed
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        pop %edx
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        CFI_ADJUST_CFA_OFFSET -4
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        pop %ecx
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        CFI_ADJUST_CFA_OFFSET -4
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        ret
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        CFI_ENDPROC
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        END(call_rwsem_down_read_failed)
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ENTRY(call_rwsem_down_write_failed)
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        CFI_STARTPROC
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        push %ecx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET ecx,0
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        calll rwsem_down_write_failed
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        pop %ecx
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        CFI_ADJUST_CFA_OFFSET -4
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        ret
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        CFI_ENDPROC
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        END(call_rwsem_down_write_failed)
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ENTRY(call_rwsem_wake)
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        CFI_STARTPROC
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        decw %dx    /* do nothing if still outstanding active readers */
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        jnz 1f
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        push %ecx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET ecx,0
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        call rwsem_wake
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        pop %ecx
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        CFI_ADJUST_CFA_OFFSET -4
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1:      ret
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        CFI_ENDPROC
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        END(call_rwsem_wake)
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/* Fix up special calling conventions */
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ENTRY(call_rwsem_downgrade_wake)
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        CFI_STARTPROC
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        push %ecx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET ecx,0
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        push %edx
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        CFI_ADJUST_CFA_OFFSET 4
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        CFI_REL_OFFSET edx,0
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        call rwsem_downgrade_wake
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        pop %edx
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        CFI_ADJUST_CFA_OFFSET -4
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        pop %ecx
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        CFI_ADJUST_CFA_OFFSET -4
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        ret
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        CFI_ENDPROC
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        END(call_rwsem_downgrade_wake)
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#endif

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