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 6This file is part of libunwind. 7 8Permission is hereby granted, free of charge, to any person obtaining 9a copy of this software and associated documentation files (the 10"Software"), to deal in the Software without restriction, including 11without limitation the rights to use, copy, modify, merge, publish, 12distribute, sublicense, and/or sell copies of the Software, and to 13permit persons to whom the Software is furnished to do so, subject to 14the following conditions: 15 16The above copyright notice and this permission notice shall be 17included in all copies or substantial portions of the Software. 18 19THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 20EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 21MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 22NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 23LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 24OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 25WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 26 27#include "unwind_i.h" 28#include "offsets.h" 29 30PROTECTED int 31unw_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 106PROTECTED int 107unw_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