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2609ec28 PMD |
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" | |
a0858608 | 21 | #include "qemu/error-report.h" |
2609ec28 | 22 | #include "exec/exec-all.h" |
2609ec28 PMD |
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 | } |