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tcg/i386: Use byte form of xgetbv instruction

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The assembler in most versions of Mac OS X is pretty old and does not
support the xgetbv instruction. To go around this problem, the raw
encoding of the instruction is used instead.

Backports commit 1019242af11400252f6735ca71a35f81ac23a66d from qemu
This commit is contained in:
John Arbuckle 2018-06-28 13:23:00 -05:00 committed by Lioncash
parent f447a6f668
commit 22c3206738
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GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 4 additions and 1 deletions
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5
qemu/tcg/i386/tcg-target.inc.c
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@ -3606,7 +3606,10 @@ 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;