| Message ID | 20180604215102.11002-1-programmingkidx@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] tcg-target.inc.c: Use byte form of xgetbv instruction | expand |
On 06/04/2018 02:51 PM, John Arbuckle wrote: > Signed-off-by: John Arbuckle <programmingkidx@gmail.com> > --- > v2 changes: > - Fixed a spacing issue in the asm() function. Applied, thanks. r~
diff --git a/tcg/i386/tcg-target.inc.c b/tcg/i386/tcg-target.inc.c index 5357909fff..09141fa8e0 100644 --- a/tcg/i386/tcg-target.inc.c +++ b/tcg/i386/tcg-target.inc.c @@ -3501,7 +3501,11 @@ static void tcg_target_init(TCGContext *s) sure of not hitting invalid opcode. */ if (c & bit_OSXSAVE) { unsigned xcrl, xcrh; - asm ("xgetbv" : "=a" (xcrl), "=d" (xcrh) : "c" (0)); + /* + * The xgetbv instruction is not available to older versions of the + * assembler, so we encode the instruction manually. + */ + asm(".byte 0x0f, 0x01, 0xd0" : "=a" (xcrl), "=d" (xcrh) : "c" (0)); if ((xcrl & 6) == 6) { have_avx1 = (c & bit_AVX) != 0; have_avx2 = (b7 & bit_AVX2) != 0;
Signed-off-by: John Arbuckle <programmingkidx@gmail.com> --- v2 changes: - Fixed a spacing issue in the asm() function. tcg/i386/tcg-target.inc.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)