1 /* libunwind - a platform-independent unwind library
2 Copyright (C) 2008 CodeSourcery
3 Copyright (C) 2011-2013 Linaro Limited
4 Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com>
5
6 This file is part of libunwind.
7
8 Permission is hereby granted, free of charge, to any person obtaining
9 a copy of this software and associated documentation files (the
10 "Software"), to deal in the Software without restriction, including
11 without limitation the rights to use, copy, modify, merge, publish,
12 distribute, sublicense, and/or sell copies of the Software, and to
13 permit persons to whom the Software is furnished to do so, subject to
14 the following conditions:
15
16 The above copyright notice and this permission notice shall be
17 included in all copies or substantial portions of the Software.
18
19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
23 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
24 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
25 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
26
27 #include "unwind_i.h"
28 #include "offsets.h"
29
30 PROTECTED int
unw_handle_signal_frame(unw_cursor_t * cursor)31 unw_handle_signal_frame (unw_cursor_t *cursor)
32 {
33 struct cursor *c = (struct cursor *) cursor;
34 int ret;
35 unw_word_t sc_addr, sp, sp_addr = c->dwarf.cfa;
36 struct dwarf_loc sp_loc = DWARF_LOC (sp_addr, 0);
37
38 if ((ret = dwarf_get (&c->dwarf, sp_loc, &sp)) < 0)
39 return -UNW_EUNSPEC;
40
41 ret = unw_is_signal_frame (cursor);
42 Debug(1, "unw_is_signal_frame()=%d\n", ret);
43
44 /* Save the SP and PC to be able to return execution at this point
45 later in time (unw_resume). */
46 c->sigcontext_sp = c->dwarf.cfa;
47 c->sigcontext_pc = c->dwarf.ip;
48
49 if (ret)
50 {
51 c->sigcontext_format = AARCH64_SCF_LINUX_RT_SIGFRAME;
52 sc_addr = sp_addr + sizeof (siginfo_t) + LINUX_UC_MCONTEXT_OFF;
53 }
54 else
55 return -UNW_EUNSPEC;
56
57 c->sigcontext_addr = sc_addr;
58
59 /* Update the dwarf cursor.
60 Set the location of the registers to the corresponding addresses of the
61 uc_mcontext / sigcontext structure contents. */
62 c->dwarf.loc[UNW_AARCH64_X0] = DWARF_LOC (sc_addr + LINUX_SC_X0_OFF, 0);
63 c->dwarf.loc[UNW_AARCH64_X1] = DWARF_LOC (sc_addr + LINUX_SC_X1_OFF, 0);
64 c->dwarf.loc[UNW_AARCH64_X2] = DWARF_LOC (sc_addr + LINUX_SC_X2_OFF, 0);
65 c->dwarf.loc[UNW_AARCH64_X3] = DWARF_LOC (sc_addr + LINUX_SC_X3_OFF, 0);
66 c->dwarf.loc[UNW_AARCH64_X4] = DWARF_LOC (sc_addr + LINUX_SC_X4_OFF, 0);
67 c->dwarf.loc[UNW_AARCH64_X5] = DWARF_LOC (sc_addr + LINUX_SC_X5_OFF, 0);
68 c->dwarf.loc[UNW_AARCH64_X6] = DWARF_LOC (sc_addr + LINUX_SC_X6_OFF, 0);
69 c->dwarf.loc[UNW_AARCH64_X7] = DWARF_LOC (sc_addr + LINUX_SC_X7_OFF, 0);
70 c->dwarf.loc[UNW_AARCH64_X8] = DWARF_LOC (sc_addr + LINUX_SC_X8_OFF, 0);
71 c->dwarf.loc[UNW_AARCH64_X9] = DWARF_LOC (sc_addr + LINUX_SC_X9_OFF, 0);
72 c->dwarf.loc[UNW_AARCH64_X10] = DWARF_LOC (sc_addr + LINUX_SC_X10_OFF, 0);
73 c->dwarf.loc[UNW_AARCH64_X11] = DWARF_LOC (sc_addr + LINUX_SC_X11_OFF, 0);
74 c->dwarf.loc[UNW_AARCH64_X12] = DWARF_LOC (sc_addr + LINUX_SC_X12_OFF, 0);
75 c->dwarf.loc[UNW_AARCH64_X13] = DWARF_LOC (sc_addr + LINUX_SC_X13_OFF, 0);
76 c->dwarf.loc[UNW_AARCH64_X14] = DWARF_LOC (sc_addr + LINUX_SC_X14_OFF, 0);
77 c->dwarf.loc[UNW_AARCH64_X15] = DWARF_LOC (sc_addr + LINUX_SC_X15_OFF, 0);
78 c->dwarf.loc[UNW_AARCH64_X16] = DWARF_LOC (sc_addr + LINUX_SC_X16_OFF, 0);
79 c->dwarf.loc[UNW_AARCH64_X17] = DWARF_LOC (sc_addr + LINUX_SC_X17_OFF, 0);
80 c->dwarf.loc[UNW_AARCH64_X18] = DWARF_LOC (sc_addr + LINUX_SC_X18_OFF, 0);
81 c->dwarf.loc[UNW_AARCH64_X19] = DWARF_LOC (sc_addr + LINUX_SC_X19_OFF, 0);
82 c->dwarf.loc[UNW_AARCH64_X20] = DWARF_LOC (sc_addr + LINUX_SC_X20_OFF, 0);
83 c->dwarf.loc[UNW_AARCH64_X21] = DWARF_LOC (sc_addr + LINUX_SC_X21_OFF, 0);
84 c->dwarf.loc[UNW_AARCH64_X22] = DWARF_LOC (sc_addr + LINUX_SC_X22_OFF, 0);
85 c->dwarf.loc[UNW_AARCH64_X23] = DWARF_LOC (sc_addr + LINUX_SC_X23_OFF, 0);
86 c->dwarf.loc[UNW_AARCH64_X24] = DWARF_LOC (sc_addr + LINUX_SC_X24_OFF, 0);
87 c->dwarf.loc[UNW_AARCH64_X25] = DWARF_LOC (sc_addr + LINUX_SC_X25_OFF, 0);
88 c->dwarf.loc[UNW_AARCH64_X26] = DWARF_LOC (sc_addr + LINUX_SC_X26_OFF, 0);
89 c->dwarf.loc[UNW_AARCH64_X27] = DWARF_LOC (sc_addr + LINUX_SC_X27_OFF, 0);
90 c->dwarf.loc[UNW_AARCH64_X28] = DWARF_LOC (sc_addr + LINUX_SC_X28_OFF, 0);
91 c->dwarf.loc[UNW_AARCH64_X29] = DWARF_LOC (sc_addr + LINUX_SC_X29_OFF, 0);
92 c->dwarf.loc[UNW_AARCH64_X30] = DWARF_LOC (sc_addr + LINUX_SC_X30_OFF, 0);
93 c->dwarf.loc[UNW_AARCH64_SP] = DWARF_LOC (sc_addr + LINUX_SC_SP_OFF, 0);
94 c->dwarf.loc[UNW_AARCH64_PC] = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0);
95 c->dwarf.loc[UNW_AARCH64_PSTATE] = DWARF_LOC (sc_addr + LINUX_SC_PSTATE_OFF, 0);
96
97 /* Set SP/CFA and PC/IP. */
98 dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_SP], &c->dwarf.cfa);
99 dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_PC], &c->dwarf.ip);
100
101 c->dwarf.pi_valid = 0;
102
103 return 1;
104 }
105
106 PROTECTED int
unw_step(unw_cursor_t * cursor)107 unw_step (unw_cursor_t *cursor)
108 {
109 struct cursor *c = (struct cursor *) cursor;
110 int ret = -UNW_ENOINFO;
111
112 Debug (1, "(cursor=%p, ip=0x%016lx, cfa=0x%016lx))\n",
113 c, c->dwarf.ip, c->dwarf.cfa);
114
115 /* Check if this is a signal frame. */
116 if (unw_is_signal_frame (cursor))
117 /* ANDROID support update. */
118 ret = unw_handle_signal_frame (cursor);
119 /* End ANDROID update. */
120
121 /* ANDROID support update. */
122 if (ret < 0)
123 {
124 ret = dwarf_step (&c->dwarf);
125 Debug(1, "dwarf_step()=%d\n", ret);
126 }
127
128 if (ret < 0 && c->dwarf.frame == 0)
129 {
130 /* If this is the first frame, the code may be executing garbage
131 * in the middle of nowhere. In this case, try using the lr as
132 * the pc.
133 */
134 unw_word_t lr;
135 if (dwarf_get(&c->dwarf, c->dwarf.loc[UNW_AARCH64_X30], &lr) >= 0)
136 {
137 if (lr != c->dwarf.ip)
138 {
139 ret = 1;
140 c->dwarf.ip = lr;
141 }
142 }
143 }
144 /* End ANDROID update. */
145
146 if (ret >= 0)
147 {
148 c->dwarf.frame++;
149 if (c->dwarf.ip >= 4)
150 c->dwarf.ip -= 4;
151 }
152
153 if (unlikely (ret == -UNW_ESTOPUNWIND))
154 return ret;
155
156 if (unlikely (ret < 0))
157 return 0;
158
159 return (c->dwarf.ip == 0) ? 0 : 1;
160 }
161