64ac24e738
Semaphores are no longer performance-critical, so a generic C implementation is better for maintainability, debuggability and extensibility. Thanks to Peter Zijlstra for fixing the lockdep warning. Thanks to Harvey Harrison for pointing out that the unlikely() was unnecessary. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Acked-by: Ingo Molnar <mingo@elte.hu>
66 lines
1.5 KiB
ArmAsm
66 lines
1.5 KiB
ArmAsm
/*
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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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*/
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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, "ax"
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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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#ifdef CONFIG_TRACE_IRQFLAGS
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thunk trace_hardirqs_on_thunk,trace_hardirqs_on
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thunk trace_hardirqs_off_thunk,trace_hardirqs_off
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#endif
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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thunk lockdep_sys_exit_thunk,lockdep_sys_exit
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#endif
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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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