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96 lines
1.9 KiB
96 lines
1.9 KiB
20 years ago
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/*
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* Save registers before calling assembly functions. This avoids
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* disturbance of register allocation in some inline assembly constructs.
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* Copyright 2001,2002 by Andi Kleen, SuSE Labs.
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* Subject to the GNU public license, v.2. No warranty of any kind.
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* $Id: thunk.S,v 1.2 2002/03/13 20:06:58 ak Exp $
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*/
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#include <linux/config.h>
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#include <linux/linkage.h>
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#include <asm/dwarf2.h>
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#include <asm/calling.h>
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#include <asm/rwlock.h>
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/* rdi: arg1 ... normal C conventions. rax is saved/restored. */
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.macro thunk name,func
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.globl \name
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\name:
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CFI_STARTPROC
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SAVE_ARGS
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call \func
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jmp restore
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CFI_ENDPROC
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.endm
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/* rdi: arg1 ... normal C conventions. rax is passed from C. */
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.macro thunk_retrax name,func
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.globl \name
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\name:
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CFI_STARTPROC
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SAVE_ARGS
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call \func
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jmp restore_norax
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CFI_ENDPROC
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.endm
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.section .sched.text
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#ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
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thunk rwsem_down_read_failed_thunk,rwsem_down_read_failed
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thunk rwsem_down_write_failed_thunk,rwsem_down_write_failed
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thunk rwsem_wake_thunk,rwsem_wake
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thunk rwsem_downgrade_thunk,rwsem_downgrade_wake
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#endif
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thunk do_softirq_thunk,do_softirq
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thunk __down_failed,__down
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thunk_retrax __down_failed_interruptible,__down_interruptible
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thunk_retrax __down_failed_trylock,__down_trylock
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thunk __up_wakeup,__up
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/* SAVE_ARGS below is used only for the .cfi directives it contains. */
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CFI_STARTPROC
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SAVE_ARGS
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restore:
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RESTORE_ARGS
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ret
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CFI_ENDPROC
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CFI_STARTPROC
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SAVE_ARGS
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restore_norax:
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RESTORE_ARGS 1
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ret
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CFI_ENDPROC
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#ifdef CONFIG_SMP
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/* Support for read/write spinlocks. */
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.text
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/* rax: pointer to rwlock_t */
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ENTRY(__write_lock_failed)
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lock
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addl $RW_LOCK_BIAS,(%rax)
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1: rep
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nop
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cmpl $RW_LOCK_BIAS,(%rax)
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jne 1b
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lock
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subl $RW_LOCK_BIAS,(%rax)
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jnz __write_lock_failed
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ret
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/* rax: pointer to rwlock_t */
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ENTRY(__read_lock_failed)
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lock
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incl (%rax)
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1: rep
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nop
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cmpl $1,(%rax)
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js 1b
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lock
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decl (%rax)
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js __read_lock_failed
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ret
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#endif
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