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 (at) 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 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 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 unw_word_t old_ip = c->dwarf.ip; 116 unw_word_t old_cfa = c->dwarf.cfa; 117 118 /* Check if this is a signal frame. */ 119 if (unw_is_signal_frame (cursor)) 120 /* ANDROID support update. */ 121 ret = unw_handle_signal_frame (cursor); 122 /* End ANDROID update. */ 123 124 /* ANDROID support update. */ 125 if (ret < 0) 126 { 127 ret = dwarf_step (&c->dwarf); 128 Debug(1, "dwarf_step()=%d\n", ret); 129 } 130 131 if (ret < 0 && c->dwarf.frame == 0) 132 { 133 /* If this is the first frame, the code may be executing garbage 134 * in the middle of nowhere. In this case, try using the lr as 135 * the pc. 136 */ 137 unw_word_t lr; 138 if (dwarf_get(&c->dwarf, c->dwarf.loc[UNW_AARCH64_X30], &lr) >= 0) 139 { 140 if (lr != c->dwarf.ip) 141 { 142 ret = 1; 143 c->dwarf.ip = lr; 144 } 145 } 146 } 147 /* End ANDROID update. */ 148 149 if (ret >= 0) 150 { 151 if (c->dwarf.ip >= 4) 152 c->dwarf.ip -= 4; 153 /* If the decode yields the exact same ip/cfa as before, then indicate 154 the unwind is complete. */ 155 if (c->dwarf.ip == old_ip && c->dwarf.cfa == old_cfa) 156 { 157 Dprintf ("%s: ip and cfa unchanged; stopping here (ip=0x%lx)\n", 158 __FUNCTION__, (long) c->dwarf.ip); 159 return -UNW_EBADFRAME; 160 } 161 c->dwarf.frame++; 162 } 163 164 if (unlikely (ret == -UNW_ESTOPUNWIND)) 165 return ret; 166 167 if (unlikely (ret <= 0)) 168 return 0; 169 170 return (c->dwarf.ip == 0) ? 0 : 1; 171 } 172
