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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 11:16:33 +0200
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 11:16:33 +0200
commit44f0257fc316ff4b33aa3438dd8d891b7d6d72b9 (patch)
treec1a9a571db37d631489f18e1dfe5554874b19027 /arch/x86/lib/putuser_32.S
parentda957e111bb0c189a4a3bf8a00caaecb59ed94ca (diff)
i386: move lib
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/lib/putuser_32.S')
-rw-r--r--arch/x86/lib/putuser_32.S98
1 files changed, 98 insertions, 0 deletions
diff --git a/arch/x86/lib/putuser_32.S b/arch/x86/lib/putuser_32.S
new file mode 100644
index 00000000000..f58fba109d1
--- /dev/null
+++ b/arch/x86/lib/putuser_32.S
@@ -0,0 +1,98 @@
+/*
+ * __put_user functions.
+ *
+ * (C) Copyright 2005 Linus Torvalds
+ *
+ * These functions have a non-standard call interface
+ * to make them more efficient, especially as they
+ * return an error value in addition to the "real"
+ * return value.
+ */
+#include <linux/linkage.h>
+#include <asm/dwarf2.h>
+#include <asm/thread_info.h>
+
+
+/*
+ * __put_user_X
+ *
+ * Inputs: %eax[:%edx] contains the data
+ * %ecx contains the address
+ *
+ * Outputs: %eax is error code (0 or -EFAULT)
+ *
+ * These functions should not modify any other registers,
+ * as they get called from within inline assembly.
+ */
+
+#define ENTER CFI_STARTPROC ; \
+ pushl %ebx ; \
+ CFI_ADJUST_CFA_OFFSET 4 ; \
+ CFI_REL_OFFSET ebx, 0 ; \
+ GET_THREAD_INFO(%ebx)
+#define EXIT popl %ebx ; \
+ CFI_ADJUST_CFA_OFFSET -4 ; \
+ CFI_RESTORE ebx ; \
+ ret ; \
+ CFI_ENDPROC
+
+.text
+ENTRY(__put_user_1)
+ ENTER
+ cmpl TI_addr_limit(%ebx),%ecx
+ jae bad_put_user
+1: movb %al,(%ecx)
+ xorl %eax,%eax
+ EXIT
+ENDPROC(__put_user_1)
+
+ENTRY(__put_user_2)
+ ENTER
+ movl TI_addr_limit(%ebx),%ebx
+ subl $1,%ebx
+ cmpl %ebx,%ecx
+ jae bad_put_user
+2: movw %ax,(%ecx)
+ xorl %eax,%eax
+ EXIT
+ENDPROC(__put_user_2)
+
+ENTRY(__put_user_4)
+ ENTER
+ movl TI_addr_limit(%ebx),%ebx
+ subl $3,%ebx
+ cmpl %ebx,%ecx
+ jae bad_put_user
+3: movl %eax,(%ecx)
+ xorl %eax,%eax
+ EXIT
+ENDPROC(__put_user_4)
+
+ENTRY(__put_user_8)
+ ENTER
+ movl TI_addr_limit(%ebx),%ebx
+ subl $7,%ebx
+ cmpl %ebx,%ecx
+ jae bad_put_user
+4: movl %eax,(%ecx)
+5: movl %edx,4(%ecx)
+ xorl %eax,%eax
+ EXIT
+ENDPROC(__put_user_8)
+
+bad_put_user:
+ CFI_STARTPROC simple
+ CFI_DEF_CFA esp, 2*4
+ CFI_OFFSET eip, -1*4
+ CFI_OFFSET ebx, -2*4
+ movl $-14,%eax
+ EXIT
+END(bad_put_user)
+
+.section __ex_table,"a"
+ .long 1b,bad_put_user
+ .long 2b,bad_put_user
+ .long 3b,bad_put_user
+ .long 4b,bad_put_user
+ .long 5b,bad_put_user
+.previous