1 /* 2 * CPU watchpoints 3 * 4 * Copyright (c) 2003 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 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "qemu/error-report.h" 22 #include "exec/exec-all.h" 23 #include "hw/core/cpu.h" 24 25 /* Add a watchpoint. */ 26 int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len, 27 int flags, CPUWatchpoint **watchpoint) 28 { 29 CPUWatchpoint *wp; 30 vaddr in_page; 31 32 /* forbid ranges which are empty or run off the end of the address space */ 33 if (len == 0 || (addr + len - 1) < addr) { 34 error_report("tried to set invalid watchpoint at %" 35 VADDR_PRIx ", len=%" VADDR_PRIu, addr, len); 36 return -EINVAL; 37 } 38 wp = g_malloc(sizeof(*wp)); 39 40 wp->vaddr = addr; 41 wp->len = len; 42 wp->flags = flags; 43 44 /* keep all GDB-injected watchpoints in front */ 45 if (flags & BP_GDB) { 46 QTAILQ_INSERT_HEAD(&cpu->watchpoints, wp, entry); 47 } else { 48 QTAILQ_INSERT_TAIL(&cpu->watchpoints, wp, entry); 49 } 50 51 in_page = -(addr | TARGET_PAGE_MASK); 52 if (len <= in_page) { 53 tlb_flush_page(cpu, addr); 54 } else { 55 tlb_flush(cpu); 56 } 57 58 if (watchpoint) { 59 *watchpoint = wp; 60 } 61 return 0; 62 } 63 64 /* Remove a specific watchpoint. */ 65 int cpu_watchpoint_remove(CPUState *cpu, vaddr addr, vaddr len, 66 int flags) 67 { 68 CPUWatchpoint *wp; 69 70 QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) { 71 if (addr == wp->vaddr && len == wp->len 72 && flags == (wp->flags & ~BP_WATCHPOINT_HIT)) { 73 cpu_watchpoint_remove_by_ref(cpu, wp); 74 return 0; 75 } 76 } 77 return -ENOENT; 78 } 79 80 /* Remove a specific watchpoint by reference. */ 81 void cpu_watchpoint_remove_by_ref(CPUState *cpu, CPUWatchpoint *watchpoint) 82 { 83 QTAILQ_REMOVE(&cpu->watchpoints, watchpoint, entry); 84 85 tlb_flush_page(cpu, watchpoint->vaddr); 86 87 g_free(watchpoint); 88 } 89 90 /* Remove all matching watchpoints. */ 91 void cpu_watchpoint_remove_all(CPUState *cpu, int mask) 92 { 93 CPUWatchpoint *wp, *next; 94 95 QTAILQ_FOREACH_SAFE(wp, &cpu->watchpoints, entry, next) { 96 if (wp->flags & mask) { 97 cpu_watchpoint_remove_by_ref(cpu, wp); 98 } 99 } 100 } 101