patch-2.4.13 linux/arch/arm/lib/getuser.S
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- Lines: 97
- Date:
Thu Oct 11 09:04:57 2001
- Orig file:
v2.4.12/linux/arch/arm/lib/getuser.S
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.12/linux/arch/arm/lib/getuser.S linux/arch/arm/lib/getuser.S
@@ -0,0 +1,96 @@
+/*
+ * linux/arch/arm/lib/getuser.S
+ *
+ * Copyright (C) 2001 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Idea from x86 version, (C) Copyright 1998 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.
+ *
+ * __get_user_X
+ *
+ * Inputs: r0 contains the address
+ * Outputs: r0 is the error code
+ * r1, r2 contains the zero-extended value
+ * lr corrupted
+ *
+ * No other registers must be altered. (see include/asm-arm/uaccess.h
+ * for specific ASM register usage).
+ *
+ * Note that ADDR_LIMIT is either 0 or 0xc0000000.
+ * Note also that it is intended that __get_user_bad is not global.
+ */
+#include <asm/constants.h>
+
+ .global __get_user_1
+__get_user_1:
+ bic r1, sp, #0x1f00
+ bic r1, r1, #0x00ff
+ ldr r1, [r1, #TSK_ADDR_LIMIT]
+ sub r1, r1, #1
+ cmp r0, r1
+1: ldrlsbt r1, [r0]
+ movls r0, #0
+ movls pc, lr
+ b __get_user_bad
+
+ .global __get_user_2
+__get_user_2:
+ bic r2, sp, #0x1f00
+ bic r2, r2, #0x00ff
+ ldr r2, [r2, #TSK_ADDR_LIMIT]
+ sub r2, r2, #2
+ cmp r0, r2
+2: ldrlsbt r1, [r0], #1
+3: ldrlsbt r2, [r0]
+ orrls r1, r1, r2, lsl #8
+ movls r0, #0
+ movls pc, lr
+ b __get_user_bad
+
+ .global __get_user_4
+__get_user_4:
+ bic r1, sp, #0x1f00
+ bic r1, r1, #0x00ff
+ ldr r1, [r1, #TSK_ADDR_LIMIT]
+ sub r1, r1, #4
+ cmp r0, r1
+4: ldrlst r1, [r0]
+ movls r0, #0
+ movls pc, lr
+ b __get_user_bad
+
+ .global __get_user_8
+__get_user_8:
+ bic r2, sp, #0x1f00
+ bic r2, r2, #0x00ff
+ ldr r2, [r2, #TSK_ADDR_LIMIT]
+ sub r2, r2, #8
+ cmp r0, r2
+5: ldrlst r1, [r0], #4
+6: ldrlst r2, [r0]
+ movls r0, #0
+ movls pc, lr
+
+ /* fall through */
+
+__get_user_bad:
+ mov r2, #0
+ mov r1, #0
+ mov r0, #-14
+ mov pc, lr
+
+.section __ex_table, "a"
+ .long 1b, __get_user_bad
+ .long 2b, __get_user_bad
+ .long 3b, __get_user_bad
+ .long 4b, __get_user_bad
+ .long 5b, __get_user_bad
+ .long 6b, __get_user_bad
+.previous
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