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| author | Al Viro <viro@zeniv.linux.org.uk> | 2017-03-26 01:36:22 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-03-29 01:24:04 +0300 |
| commit | 122b05ddf506e637336dcf64b5a129825f7bf6d4 (patch) | |
| tree | e8addfa4b5747e198698c0d54789b077cf2a92a0 /arch/x86/include/asm/uaccess.h | |
| parent | d597580d373774b1bdab84b3d26ff0b55162b916 (diff) | |
| download | linux-122b05ddf506e637336dcf64b5a129825f7bf6d4.tar.xz | |
amd64: get rid of zeroing
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/x86/include/asm/uaccess.h')
| -rw-r--r-- | arch/x86/include/asm/uaccess.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 0522d88a7f90..26410afcb8b0 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -379,6 +379,18 @@ do { \ : "=r" (err), ltype(x) \ : "m" (__m(addr)), "i" (errret), "0" (err)) +#define __get_user_asm_nozero(x, addr, err, itype, rtype, ltype, errret) \ + asm volatile("\n" \ + "1: mov"itype" %2,%"rtype"1\n" \ + "2:\n" \ + ".section .fixup,\"ax\"\n" \ + "3: mov %3,%0\n" \ + " jmp 2b\n" \ + ".previous\n" \ + _ASM_EXTABLE(1b, 3b) \ + : "=r" (err), ltype(x) \ + : "m" (__m(addr)), "i" (errret), "0" (err)) + /* * This doesn't do __uaccess_begin/end - the exception handling * around it must do that. |