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-rw-r--r--kernel/arch/x86/lib/getuser.S140
1 files changed, 140 insertions, 0 deletions
diff --git a/kernel/arch/x86/lib/getuser.S b/kernel/arch/x86/lib/getuser.S
new file mode 100644
index 000000000..a45123596
--- /dev/null
+++ b/kernel/arch/x86/lib/getuser.S
@@ -0,0 +1,140 @@
+/*
+ * __get_user functions.
+ *
+ * (C) Copyright 1998 Linus Torvalds
+ * (C) Copyright 2005 Andi Kleen
+ * (C) Copyright 2008 Glauber Costa
+ *
+ * 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: %[r|e]ax contains the address.
+ *
+ * Outputs: %[r|e]ax is error code (0 or -EFAULT)
+ * %[r|e]dx contains zero-extended value
+ * %ecx contains the high half for 32-bit __get_user_8
+ *
+ *
+ * These functions should not modify any other registers,
+ * as they get called from within inline assembly.
+ */
+
+#include <linux/linkage.h>
+#include <asm/dwarf2.h>
+#include <asm/page_types.h>
+#include <asm/errno.h>
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+#include <asm/asm.h>
+#include <asm/smap.h>
+
+ .text
+ENTRY(__get_user_1)
+ CFI_STARTPROC
+ GET_THREAD_INFO(%_ASM_DX)
+ cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
+ jae bad_get_user
+ ASM_STAC
+1: movzbl (%_ASM_AX),%edx
+ xor %eax,%eax
+ ASM_CLAC
+ ret
+ CFI_ENDPROC
+ENDPROC(__get_user_1)
+
+ENTRY(__get_user_2)
+ CFI_STARTPROC
+ add $1,%_ASM_AX
+ jc bad_get_user
+ GET_THREAD_INFO(%_ASM_DX)
+ cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
+ jae bad_get_user
+ ASM_STAC
+2: movzwl -1(%_ASM_AX),%edx
+ xor %eax,%eax
+ ASM_CLAC
+ ret
+ CFI_ENDPROC
+ENDPROC(__get_user_2)
+
+ENTRY(__get_user_4)
+ CFI_STARTPROC
+ add $3,%_ASM_AX
+ jc bad_get_user
+ GET_THREAD_INFO(%_ASM_DX)
+ cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
+ jae bad_get_user
+ ASM_STAC
+3: movl -3(%_ASM_AX),%edx
+ xor %eax,%eax
+ ASM_CLAC
+ ret
+ CFI_ENDPROC
+ENDPROC(__get_user_4)
+
+ENTRY(__get_user_8)
+ CFI_STARTPROC
+#ifdef CONFIG_X86_64
+ add $7,%_ASM_AX
+ jc bad_get_user
+ GET_THREAD_INFO(%_ASM_DX)
+ cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
+ jae bad_get_user
+ ASM_STAC
+4: movq -7(%_ASM_AX),%rdx
+ xor %eax,%eax
+ ASM_CLAC
+ ret
+#else
+ add $7,%_ASM_AX
+ jc bad_get_user_8
+ GET_THREAD_INFO(%_ASM_DX)
+ cmp TI_addr_limit(%_ASM_DX),%_ASM_AX
+ jae bad_get_user_8
+ ASM_STAC
+4: movl -7(%_ASM_AX),%edx
+5: movl -3(%_ASM_AX),%ecx
+ xor %eax,%eax
+ ASM_CLAC
+ ret
+#endif
+ CFI_ENDPROC
+ENDPROC(__get_user_8)
+
+
+bad_get_user:
+ CFI_STARTPROC
+ xor %edx,%edx
+ mov $(-EFAULT),%_ASM_AX
+ ASM_CLAC
+ ret
+ CFI_ENDPROC
+END(bad_get_user)
+
+#ifdef CONFIG_X86_32
+bad_get_user_8:
+ CFI_STARTPROC
+ xor %edx,%edx
+ xor %ecx,%ecx
+ mov $(-EFAULT),%_ASM_AX
+ ASM_CLAC
+ ret
+ CFI_ENDPROC
+END(bad_get_user_8)
+#endif
+
+ _ASM_EXTABLE(1b,bad_get_user)
+ _ASM_EXTABLE(2b,bad_get_user)
+ _ASM_EXTABLE(3b,bad_get_user)
+#ifdef CONFIG_X86_64
+ _ASM_EXTABLE(4b,bad_get_user)
+#else
+ _ASM_EXTABLE(4b,bad_get_user_8)
+ _ASM_EXTABLE(5b,bad_get_user_8)
+#endif