| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | /* See https://gitlab.com/qemu-project/qemu/-/work_items/3391 */ |
| 3 | |
| 4 | int main() |
| 5 | { |
| 6 | int data = 0; |
| 7 | |
| 8 | /* Ensure that ignored segment override prefixes are actually ignored */ |
| 9 | asm volatile ( |
| 10 | "wrgsbase %0\n\t" |
| 11 | ".byte 0x65, 0x26\n\t" /* prefixes: GS + ES */ |
| 12 | "movb $0, 0\n\t" |
| 13 | ".byte 0x65, 0x2E\n\t" /* prefixes: GS + CS */ |
| 14 | "movb $0, 0\n\t" |
| 15 | ".byte 0x65, 0x36\n\t" /* prefixes: GS + SS */ |
| 16 | "movb $0, 0\n\t" |
| 17 | ".byte 0x65, 0x3E\n\t" /* prefixes: GS + DS */ |
| 18 | "movb $0, 0\n\t" |
| 19 | : |
| 20 | : "r" (&data) |
| 21 | : "memory" |
| 22 | ); |
| 23 | |
| 24 | return 0; |
| 25 | } |