Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 95 insertions, 0 deletions

diff --git a/arch/x86_64/lib/thunk.S b/arch/x86_64/lib/thunk.S
new file mode 100644
index 000000000000..acc1e2ca7ed7
--- /dev/null
+++ b/arch/x86_64/lib/thunk.S
@@ -0,0 +1,95 @@
+        /*
+         * 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/dwarf2.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:  
+        CFI_STARTPROC
+        SAVE_ARGS
+        call \func
+        jmp  restore
+        CFI_ENDPROC
+        .endm
+
+        /* rdi: arg1 ... normal C conventions. rax is passed from C. */         
+        .macro thunk_retrax name,func
+        .globl \name
+\name:  
+        CFI_STARTPROC
+        SAVE_ARGS
+        call \func
+        jmp  restore_norax
+        CFI_ENDPROC
+        .endm
+        
+
+        .section .sched.text
+#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
+        thunk rwsem_downgrade_thunk,rwsem_downgrade_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
+        
+        /* SAVE_ARGS below is used only for the .cfi directives it contains. */
+        CFI_STARTPROC
+        SAVE_ARGS
+restore:
+        RESTORE_ARGS
+        ret     
+        CFI_ENDPROC
+        
+        CFI_STARTPROC
+        SAVE_ARGS
+restore_norax:  
+        RESTORE_ARGS 1
+        ret
+        CFI_ENDPROC
+
+#ifdef CONFIG_SMP
+/* Support for read/write spinlocks. */
+        .text
+/* 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