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 I386_HOSTDEP_H 13 #define I386_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 */ rewind_if_in_safe_syscall(void * puc)25static inline void rewind_if_in_safe_syscall(void *puc) 26 { 27 ucontext_t *uc = puc; 28 greg_t *pcreg = &uc->uc_mcontext.gregs[REG_EIP]; 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 39