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-rw-r--r--arch/x86/lib/getuser.S185
1 files changed, 185 insertions, 0 deletions
diff --git a/arch/x86/lib/getuser.S b/arch/x86/lib/getuser.S
new file mode 100644
index 0000000000..9c63713477
--- /dev/null
+++ b/arch/x86/lib/getuser.S
@@ -0,0 +1,185 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * __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/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>
+#include <asm/export.h>
+
+#define ASM_BARRIER_NOSPEC ALTERNATIVE "", "lfence", X86_FEATURE_LFENCE_RDTSC
+
+.macro check_range size:req
+.if IS_ENABLED(CONFIG_X86_64)
+ mov %rax, %rdx
+ sar $63, %rdx
+ or %rdx, %rax
+.else
+ cmp $TASK_SIZE_MAX-\size+1, %eax
+ jae .Lbad_get_user
+ sbb %edx, %edx /* array_index_mask_nospec() */
+ and %edx, %eax
+.endif
+.endm
+
+ .text
+SYM_FUNC_START(__get_user_1)
+ check_range size=1
+ ASM_STAC
+1: movzbl (%_ASM_AX),%edx
+ xor %eax,%eax
+ ASM_CLAC
+ RET
+SYM_FUNC_END(__get_user_1)
+EXPORT_SYMBOL(__get_user_1)
+
+SYM_FUNC_START(__get_user_2)
+ check_range size=2
+ ASM_STAC
+2: movzwl (%_ASM_AX),%edx
+ xor %eax,%eax
+ ASM_CLAC
+ RET
+SYM_FUNC_END(__get_user_2)
+EXPORT_SYMBOL(__get_user_2)
+
+SYM_FUNC_START(__get_user_4)
+ check_range size=4
+ ASM_STAC
+3: movl (%_ASM_AX),%edx
+ xor %eax,%eax
+ ASM_CLAC
+ RET
+SYM_FUNC_END(__get_user_4)
+EXPORT_SYMBOL(__get_user_4)
+
+SYM_FUNC_START(__get_user_8)
+ check_range size=8
+ ASM_STAC
+#ifdef CONFIG_X86_64
+4: movq (%_ASM_AX),%rdx
+#else
+4: movl (%_ASM_AX),%edx
+5: movl 4(%_ASM_AX),%ecx
+#endif
+ xor %eax,%eax
+ ASM_CLAC
+ RET
+SYM_FUNC_END(__get_user_8)
+EXPORT_SYMBOL(__get_user_8)
+
+/* .. and the same for __get_user, just without the range checks */
+SYM_FUNC_START(__get_user_nocheck_1)
+ ASM_STAC
+ ASM_BARRIER_NOSPEC
+6: movzbl (%_ASM_AX),%edx
+ xor %eax,%eax
+ ASM_CLAC
+ RET
+SYM_FUNC_END(__get_user_nocheck_1)
+EXPORT_SYMBOL(__get_user_nocheck_1)
+
+SYM_FUNC_START(__get_user_nocheck_2)
+ ASM_STAC
+ ASM_BARRIER_NOSPEC
+7: movzwl (%_ASM_AX),%edx
+ xor %eax,%eax
+ ASM_CLAC
+ RET
+SYM_FUNC_END(__get_user_nocheck_2)
+EXPORT_SYMBOL(__get_user_nocheck_2)
+
+SYM_FUNC_START(__get_user_nocheck_4)
+ ASM_STAC
+ ASM_BARRIER_NOSPEC
+8: movl (%_ASM_AX),%edx
+ xor %eax,%eax
+ ASM_CLAC
+ RET
+SYM_FUNC_END(__get_user_nocheck_4)
+EXPORT_SYMBOL(__get_user_nocheck_4)
+
+SYM_FUNC_START(__get_user_nocheck_8)
+ ASM_STAC
+ ASM_BARRIER_NOSPEC
+#ifdef CONFIG_X86_64
+9: movq (%_ASM_AX),%rdx
+#else
+9: movl (%_ASM_AX),%edx
+10: movl 4(%_ASM_AX),%ecx
+#endif
+ xor %eax,%eax
+ ASM_CLAC
+ RET
+SYM_FUNC_END(__get_user_nocheck_8)
+EXPORT_SYMBOL(__get_user_nocheck_8)
+
+
+SYM_CODE_START_LOCAL(__get_user_handle_exception)
+ ASM_CLAC
+.Lbad_get_user:
+ xor %edx,%edx
+ mov $(-EFAULT),%_ASM_AX
+ RET
+SYM_CODE_END(__get_user_handle_exception)
+
+#ifdef CONFIG_X86_32
+SYM_CODE_START_LOCAL(__get_user_8_handle_exception)
+ ASM_CLAC
+bad_get_user_8:
+ xor %edx,%edx
+ xor %ecx,%ecx
+ mov $(-EFAULT),%_ASM_AX
+ RET
+SYM_CODE_END(__get_user_8_handle_exception)
+#endif
+
+/* get_user */
+ _ASM_EXTABLE(1b, __get_user_handle_exception)
+ _ASM_EXTABLE(2b, __get_user_handle_exception)
+ _ASM_EXTABLE(3b, __get_user_handle_exception)
+#ifdef CONFIG_X86_64
+ _ASM_EXTABLE(4b, __get_user_handle_exception)
+#else
+ _ASM_EXTABLE(4b, __get_user_8_handle_exception)
+ _ASM_EXTABLE(5b, __get_user_8_handle_exception)
+#endif
+
+/* __get_user */
+ _ASM_EXTABLE(6b, __get_user_handle_exception)
+ _ASM_EXTABLE(7b, __get_user_handle_exception)
+ _ASM_EXTABLE(8b, __get_user_handle_exception)
+#ifdef CONFIG_X86_64
+ _ASM_EXTABLE(9b, __get_user_handle_exception)
+#else
+ _ASM_EXTABLE(9b, __get_user_8_handle_exception)
+ _ASM_EXTABLE(10b, __get_user_8_handle_exception)
+#endif