Linux-2.6.12-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!
diff --git a/arch/x86_64/lib/getuser.S b/arch/x86_64/lib/getuser.S
new file mode 100644
index 0000000..f94ea8a
--- /dev/null
+++ b/arch/x86_64/lib/getuser.S
@@ -0,0 +1,101 @@
+/*
+ * __get_user functions.
+ *
+ * (C) Copyright 1998 Linus Torvalds
+ * (C) Copyright 2005 Andi Kleen
+ *
+ * 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: %rcx contains the address.
+ * The register is modified, but all changes are undone
+ * before returning because the C code doesn't know about it.
+ *
+ * Outputs: %rax is error code (0 or -EFAULT)
+ * %rdx contains zero-extended value
+ *
+ * %r8 is destroyed.
+ *
+ * These functions should not modify any other registers,
+ * as they get called from within inline assembly.
+ */
+
+#include <linux/linkage.h>
+#include <asm/page.h>
+#include <asm/errno.h>
+#include <asm/offset.h>
+#include <asm/thread_info.h>
+
+ .text
+ .p2align 4
+.globl __get_user_1
+__get_user_1:
+ GET_THREAD_INFO(%r8)
+ cmpq threadinfo_addr_limit(%r8),%rcx
+ jae bad_get_user
+1: movzb (%rcx),%edx
+ xorl %eax,%eax
+ ret
+
+ .p2align 4
+.globl __get_user_2
+__get_user_2:
+ GET_THREAD_INFO(%r8)
+ addq $1,%rcx
+ jc 20f
+ cmpq threadinfo_addr_limit(%r8),%rcx
+ jae 20f
+ decq %rcx
+2: movzwl (%rcx),%edx
+ xorl %eax,%eax
+ ret
+20: decq %rcx
+ jmp bad_get_user
+
+ .p2align 4
+.globl __get_user_4
+__get_user_4:
+ GET_THREAD_INFO(%r8)
+ addq $3,%rcx
+ jc 30f
+ cmpq threadinfo_addr_limit(%r8),%rcx
+ jae 30f
+ subq $3,%rcx
+3: movl (%rcx),%edx
+ xorl %eax,%eax
+ ret
+30: subq $3,%rcx
+ jmp bad_get_user
+
+ .p2align 4
+.globl __get_user_8
+__get_user_8:
+ GET_THREAD_INFO(%r8)
+ addq $7,%rcx
+ jc bad_get_user
+ cmpq threadinfo_addr_limit(%r8),%rcx
+ jae bad_get_user
+ subq $7,%rcx
+4: movq (%rcx),%rdx
+ xorl %eax,%eax
+ ret
+40: subq $7,%rcx
+ jmp bad_get_user
+
+bad_get_user:
+ xorl %edx,%edx
+ movq $(-EFAULT),%rax
+ ret
+
+.section __ex_table,"a"
+ .quad 1b,bad_get_user
+ .quad 2b,bad_get_user
+ .quad 3b,bad_get_user
+ .quad 4b,bad_get_user
+.previous