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author | iap10@labyrinth.cl.cam.ac.uk <iap10@labyrinth.cl.cam.ac.uk> | 2003-02-24 16:55:07 +0000 |
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committer | iap10@labyrinth.cl.cam.ac.uk <iap10@labyrinth.cl.cam.ac.uk> | 2003-02-24 16:55:07 +0000 |
commit | a48212cb65e09669ed243581556529681cebba0a (patch) | |
tree | a58f47e4764f343db87eba48d17ce9b2ddbf8047 /old/xenolinux-2.4.16-sparse/arch/xeno/lib/getuser.S | |
parent | 96ce9e11d148a721557d48ed5a8ca7857a7bc937 (diff) | |
download | xen-a48212cb65e09669ed243581556529681cebba0a.tar.gz xen-a48212cb65e09669ed243581556529681cebba0a.tar.bz2 xen-a48212cb65e09669ed243581556529681cebba0a.zip |
bitkeeper revision 1.93 (3e5a4e6bkPheUp3x1uufN2MS3LAB7A)
Latest and Greatest version of XenoLinux based on the Linux-2.4.21-pre4
kernel.
Diffstat (limited to 'old/xenolinux-2.4.16-sparse/arch/xeno/lib/getuser.S')
-rw-r--r-- | old/xenolinux-2.4.16-sparse/arch/xeno/lib/getuser.S | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/old/xenolinux-2.4.16-sparse/arch/xeno/lib/getuser.S b/old/xenolinux-2.4.16-sparse/arch/xeno/lib/getuser.S new file mode 100644 index 0000000000..c244721e70 --- /dev/null +++ b/old/xenolinux-2.4.16-sparse/arch/xeno/lib/getuser.S @@ -0,0 +1,73 @@ +/* + * __get_user functions. + * + * (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: %eax contains the address + * + * Outputs: %eax is error code (0 or -EFAULT) + * %edx contains zero-extended value + * + * These functions should not modify any other registers, + * as they get called from within inline assembly. + */ + +addr_limit = 12 + +.text +.align 4 +.globl __get_user_1 +__get_user_1: + movl %esp,%edx + andl $0xffffe000,%edx + cmpl addr_limit(%edx),%eax + jae bad_get_user +1: movzbl (%eax),%edx + xorl %eax,%eax + ret + +.align 4 +.globl __get_user_2 +__get_user_2: + addl $1,%eax + movl %esp,%edx + jc bad_get_user + andl $0xffffe000,%edx + cmpl addr_limit(%edx),%eax + jae bad_get_user +2: movzwl -1(%eax),%edx + xorl %eax,%eax + ret + +.align 4 +.globl __get_user_4 +__get_user_4: + addl $3,%eax + movl %esp,%edx + jc bad_get_user + andl $0xffffe000,%edx + cmpl addr_limit(%edx),%eax + jae bad_get_user +3: movl -3(%eax),%edx + xorl %eax,%eax + ret + +bad_get_user: + xorl %edx,%edx + movl $-14,%eax + ret + +.section __ex_table,"a" + .long 1b,bad_get_user + .long 2b,bad_get_user + .long 3b,bad_get_user +.previous |