patch-2.4.20 linux-2.4.20/arch/x86_64/lib/thunk.S
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- Lines: 82
- Date:
Thu Nov 28 15:53:12 2002
- Orig file:
linux-2.4.19/arch/x86_64/lib/thunk.S
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN linux-2.4.19/arch/x86_64/lib/thunk.S linux-2.4.20/arch/x86_64/lib/thunk.S
@@ -0,0 +1,81 @@
+ /*
+ * Save registers before calling assembly functions. This avoids
+ * disturbance of register allocation in some inline assembly constructs.
+ * Copyright 2001,2002 by Andi Kleen, SuSE Labs.
+ * Subject to the GNU public license, v.2. No warranty of any kind.
+ * $Id: thunk.S,v 1.2 2002/03/13 20:06:58 ak Exp $
+ */
+
+ #include <linux/config.h>
+ #include <linux/linkage.h>
+ #include <asm/calling.h>
+ #include <asm/rwlock.h>
+
+ /* rdi: arg1 ... normal C conventions. rax is saved/restored. */
+ .macro thunk name,func
+ .globl \name
+\name:
+ SAVE_ARGS
+ call \func
+ jmp restore
+ .endm
+
+ /* rdi: arg1 ... normal C conventions. rax is passed from C. */
+ .macro thunk_retrax name,func
+ .globl \name
+\name:
+ SAVE_ARGS
+ call \func
+ jmp restore_norax
+ .endm
+
+
+#ifdef CONFIG_RWSEM_XCHGADD_ALGORITHM
+ thunk rwsem_down_read_failed_thunk,rwsem_down_read_failed
+ thunk rwsem_down_write_failed_thunk,rwsem_down_write_failed
+ thunk rwsem_wake_thunk,rwsem_wake
+#endif
+ thunk do_softirq_thunk,do_softirq
+
+ thunk __down_failed,__down
+ thunk_retrax __down_failed_interruptible,__down_interruptible
+ thunk_retrax __down_failed_trylock,__down_trylock
+ thunk __up_wakeup,__up
+
+restore:
+ RESTORE_ARGS
+ ret
+
+restore_norax:
+ RESTORE_ARGS 1
+ ret
+
+#ifdef CONFIG_SMP
+/* Support for read/write spinlocks. */
+
+/* rax: pointer to rwlock_t */
+ENTRY(__write_lock_failed)
+ lock
+ addl $RW_LOCK_BIAS,(%rax)
+1: rep
+ nop
+ cmpl $RW_LOCK_BIAS,(%rax)
+ jne 1b
+ lock
+ subl $RW_LOCK_BIAS,(%rax)
+ jnz __write_lock_failed
+ ret
+
+/* rax: pointer to rwlock_t */
+ENTRY(__read_lock_failed)
+ lock
+ incl (%rax)
+1: rep
+ nop
+ cmpl $1,(%rax)
+ js 1b
+ lock
+ decl (%rax)
+ js __read_lock_failed
+ ret
+#endif
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