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