tests/acpi: add new unit test to test hotplug off/on feature on the root pci bus
[qemu.git] / linux-user / host / x86_64 / hostdep.h
1 /*
2 * hostdep.h : things which are dependent on the host architecture
3 *
4 * * Written by Peter Maydell <peter.maydell@linaro.org>
5 *
6 * Copyright (C) 2016 Linaro Limited
7 *
8 * This work is licensed under the terms of the GNU GPL, version 2 or later.
9 * See the COPYING file in the top-level directory.
10 */
11
12 #ifndef X86_64_HOSTDEP_H
13 #define X86_64_HOSTDEP_H
14
15 /* We have a safe-syscall.inc.S */
16 #define HAVE_SAFE_SYSCALL
17
18 #ifndef __ASSEMBLER__
19
20 /* These are defined by the safe-syscall.inc.S file */
21 extern char safe_syscall_start[];
22 extern char safe_syscall_end[];
23
24 /* Adjust the signal context to rewind out of safe-syscall if we're in it */
25 static inline void rewind_if_in_safe_syscall(void *puc)
26 {
27 ucontext_t *uc = puc;
28 greg_t *pcreg = &uc->uc_mcontext.gregs[REG_RIP];
29
30 if (*pcreg > (uintptr_t)safe_syscall_start
31 && *pcreg < (uintptr_t)safe_syscall_end) {
32 *pcreg = (uintptr_t)safe_syscall_start;
33 }
34 }
35
36 #endif /* __ASSEMBLER__ */
37
38 #endif