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x86, reloc: Use xorl instead of xorq in relocate_kernel_64.S 

There is no point in using "xorq" to clear a register... use "xorl" to
clear the bottom 32 bits, and the upper 32 bits get cleared by virtue
of zero extension.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Kees Cook <keescook@chromium.org>
Link: http://lkml.kernel.org/n/tip-b76zi1gep39c0zs8fbvkhie9@git.kernel.org
This commit is contained in:
H. Peter Anvin 2013-06-20 21:16:00 -07:00
parent e6bca5a6a8
commit f037e416af
1 changed files with 17 additions and 17 deletions
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34
arch/x86/kernel/relocate_kernel_64.S
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@ -151,21 +151,21 @@ identity_mapped:
testq %r11, %r11 testq %r11, %r11
jnz 1f jnz 1f
xorq %rax, %rax xorl %eax, %eax
xorq %rbx, %rbx xorl %ebx, %ebx
xorq %rcx, %rcx xorl %ecx, %ecx
xorq %rdx, %rdx xorl %edx, %edx
xorq %rsi, %rsi xorl %esi, %esi
xorq %rdi, %rdi xorl %edi, %edi
xorq %rbp, %rbp xorl %ebp, %ebp
xorq %r8, %r8 xorl %r8d, %r8d
xorq %r9, %r9 xorl %r9d, %r9d
xorq %r10, %r10 xorl %r10d, %r10d
xorq %r11, %r11 xorl %r11d, %r11d
xorq %r12, %r12 xorl %r12d, %r12d
xorq %r13, %r13 xorl %r13d, %r13d
xorq %r14, %r14 xorl %r14d, %r14d
xorq %r15, %r15 xorl %r15d, %r15d
ret ret
@ -212,8 +212,8 @@ virtual_mapped:
/* Do the copies */ /* Do the copies */
swap_pages: swap_pages:
movq %rdi, %rcx /* Put the page_list in %rcx */ movq %rdi, %rcx /* Put the page_list in %rcx */
xorq %rdi, %rdi xorl %edi, %edi
xorq %rsi, %rsi xorl %esi, %esi
jmp 1f jmp 1f
0: /* top, read another word for the indirection page */ 0: /* top, read another word for the indirection page */