| user-exec.c (9c125d17e9402c232c46610802e5931b3639d77b) | user-exec.c (9323e79f10e5f5d8fffc3b307776173ca11faeae) |
|---|---|
| 1/* 2 * User emulator execution 3 * 4 * Copyright (c) 2003-2005 Fabrice Bellard 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either --- 87 unchanged lines hidden (view full) --- 96 * @cpu: the cpu context 97 * @old_set: the sigset_t from the signal ucontext_t 98 * @host_pc: the host pc, adjusted for the signal 99 * @guest_addr: the guest address of the fault 100 * 101 * Return true if the write fault has been handled, and should be re-tried. 102 * 103 * Note that it is important that we don't call page_unprotect() unless | 1/* 2 * User emulator execution 3 * 4 * Copyright (c) 2003-2005 Fabrice Bellard 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either --- 87 unchanged lines hidden (view full) --- 96 * @cpu: the cpu context 97 * @old_set: the sigset_t from the signal ucontext_t 98 * @host_pc: the host pc, adjusted for the signal 99 * @guest_addr: the guest address of the fault 100 * 101 * Return true if the write fault has been handled, and should be re-tried. 102 * 103 * Note that it is important that we don't call page_unprotect() unless |
| 104 * this is really a "write to nonwriteable page" fault, because | 104 * this is really a "write to nonwritable page" fault, because |
| 105 * page_unprotect() assumes that if it is called for an access to | 105 * page_unprotect() assumes that if it is called for an access to |
| 106 * a page that's writeable this means we had two threads racing and 107 * another thread got there first and already made the page writeable; | 106 * a page that's writable this means we had two threads racing and 107 * another thread got there first and already made the page writable; |
| 108 * so we will retry the access. If we were to call page_unprotect() 109 * for some other kind of fault that should really be passed to the 110 * guest, we'd end up in an infinite loop of retrying the faulting access. 111 */ 112bool handle_sigsegv_accerr_write(CPUState *cpu, sigset_t *old_set, 113 uintptr_t host_pc, abi_ptr guest_addr) 114{ 115 switch (page_unprotect(guest_addr, host_pc)) { --- 412 unchanged lines hidden --- | 108 * so we will retry the access. If we were to call page_unprotect() 109 * for some other kind of fault that should really be passed to the 110 * guest, we'd end up in an infinite loop of retrying the faulting access. 111 */ 112bool handle_sigsegv_accerr_write(CPUState *cpu, sigset_t *old_set, 113 uintptr_t host_pc, abi_ptr guest_addr) 114{ 115 switch (page_unprotect(guest_addr, host_pc)) { --- 412 unchanged lines hidden --- |