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/cputlb.h" 23 #include "exec/target_page.h" 24 #include "exec/watchpoint.h" 25 #include "hw/core/cpu.h" 26 27 /* Add a watchpoint. */ 28 int cpu_watchpoint_insert(CPUState *cpu, vaddr addr, vaddr len, 29 int flags, CPUWatchpoint **watchpoint) 30 { 31 CPUWatchpoint *wp; 32 vaddr in_page; 33 34 /* forbid ranges which are empty or run off the end of the address space */ 35 if (len == 0 || (addr + len - 1) < addr) { 36 error_report("tried to set invalid watchpoint at %" 37 VADDR_PRIx ", len=%" VADDR_PRIu, addr, len); 38 return -EINVAL; 39 } 40 wp = g_malloc(sizeof(*wp)); 41 42 wp->vaddr = addr; 43 wp->len = len; 44 wp->flags = flags; 45 46 /* keep all GDB-injected watchpoints in front */ 47 if (flags & BP_GDB) { 48 QTAILQ_INSERT_HEAD(&cpu->watchpoints, wp, entry); 49 } else { 50 QTAILQ_INSERT_TAIL(&cpu->watchpoints, wp, entry); 51 } 52 53 in_page = -(addr | TARGET_PAGE_MASK); 54 if (len <= in_page) { 55 tlb_flush_page(cpu, addr); 56 } else { 57 tlb_flush(cpu); 58 } 59 60 if (watchpoint) { 61 *watchpoint = wp; 62 } 63 return 0; 64 } 65 66 /* Remove a specific watchpoint. */ 67 int cpu_watchpoint_remove(CPUState *cpu, vaddr addr, vaddr len, 68 int flags) 69 { 70 CPUWatchpoint *wp; 71 72 QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) { 73 if (addr == wp->vaddr && len == wp->len 74 && flags == (wp->flags & ~BP_WATCHPOINT_HIT)) { 75 cpu_watchpoint_remove_by_ref(cpu, wp); 76 return 0; 77 } 78 } 79 return -ENOENT; 80 } 81 82 /* Remove a specific watchpoint by reference. */ 83 void cpu_watchpoint_remove_by_ref(CPUState *cpu, CPUWatchpoint *watchpoint) 84 { 85 QTAILQ_REMOVE(&cpu->watchpoints, watchpoint, entry); 86 87 tlb_flush_page(cpu, watchpoint->vaddr); 88 89 g_free(watchpoint); 90 } 91 92 /* Remove all matching watchpoints. */ 93 void cpu_watchpoint_remove_all(CPUState *cpu, int mask) 94 { 95 CPUWatchpoint *wp, *next; 96 97 QTAILQ_FOREACH_SAFE(wp, &cpu->watchpoints, entry, next) { 98 if (wp->flags & mask) { 99 cpu_watchpoint_remove_by_ref(cpu, wp); 100 } 101 } 102 } 103