1/* libunwind - a platform-independent unwind library 2 Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com> 3 Copyright (C) 2013 Linaro Limited 4 5This file is part of libunwind. 6 7Permission is hereby granted, free of charge, to any person obtaining 8a copy of this software and associated documentation files (the 9"Software"), to deal in the Software without restriction, including 10without limitation the rights to use, copy, modify, merge, publish, 11distribute, sublicense, and/or sell copies of the Software, and to 12permit persons to whom the Software is furnished to do so, subject to 13the following conditions: 14 15The above copyright notice and this permission notice shall be 16included in all copies or substantial portions of the Software. 17 18THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 21NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE 22LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ 25 26#include "unwind_i.h" 27#include "offsets.h" 28 29/* The restorer stub will always have the form: 30 31 d2801168 movz x8, #0x8b 32 d4000001 svc #0x0 33*/ 34 35PROTECTED int 36unw_is_signal_frame (unw_cursor_t *cursor) 37{ 38#ifdef __linux__ 39 struct cursor *c = (struct cursor *) cursor; 40 unw_word_t w0, ip; 41 unw_addr_space_t as; 42 unw_accessors_t *a; 43 void *arg; 44 int ret; 45 46 as = c->dwarf.as; 47 a = unw_get_accessors (as); 48 arg = c->dwarf.as_arg; 49 50 ip = c->dwarf.ip; 51 52 ret = (*a->access_mem) (as, ip, &w0, 0, arg); 53 if (ret < 0) 54 return ret; 55 56 /* FIXME: distinguish 32bit insn vs 64bit registers. */ 57 if (w0 != 0xd4000001d2801168) 58 return 0; 59 60 return 1; 61#elif defined (__Fuchsia__) 62 return 0; 63#else 64 return -UNW_ENOINFO; 65#endif 66} 67 68PROTECTED int 69unw_handle_signal_frame (unw_cursor_t *cursor) 70{ 71#ifdef __linux__ 72 struct cursor *c = (struct cursor *) cursor; 73 int ret; 74 unw_word_t sc_addr, sp, sp_addr = c->dwarf.cfa; 75 struct dwarf_loc sp_loc = DWARF_LOC (sp_addr, 0); 76 77 if ((ret = dwarf_get (&c->dwarf, sp_loc, &sp)) < 0) 78 return -UNW_EUNSPEC; 79 80 ret = unw_is_signal_frame (cursor); 81 Debug(1, "unw_is_signal_frame()=%d\n", ret); 82 83 if (ret) 84 { 85 c->sigcontext_format = AARCH64_SCF_LINUX_RT_SIGFRAME; 86 sc_addr = sp_addr + sizeof (siginfo_t) + LINUX_UC_MCONTEXT_OFF; 87 } 88 else 89 return -UNW_EUNSPEC; 90 91 c->sigcontext_addr = sc_addr; 92 c->frame_info.frame_type = UNW_AARCH64_FRAME_SIGRETURN; 93 c->frame_info.cfa_reg_offset = sc_addr - sp_addr; 94 95 /* Update the dwarf cursor. 96 Set the location of the registers to the corresponding addresses of the 97 uc_mcontext / sigcontext structure contents. */ 98 c->dwarf.loc[UNW_AARCH64_X0] = DWARF_LOC (sc_addr + LINUX_SC_X0_OFF, 0); 99 c->dwarf.loc[UNW_AARCH64_X1] = DWARF_LOC (sc_addr + LINUX_SC_X1_OFF, 0); 100 c->dwarf.loc[UNW_AARCH64_X2] = DWARF_LOC (sc_addr + LINUX_SC_X2_OFF, 0); 101 c->dwarf.loc[UNW_AARCH64_X3] = DWARF_LOC (sc_addr + LINUX_SC_X3_OFF, 0); 102 c->dwarf.loc[UNW_AARCH64_X4] = DWARF_LOC (sc_addr + LINUX_SC_X4_OFF, 0); 103 c->dwarf.loc[UNW_AARCH64_X5] = DWARF_LOC (sc_addr + LINUX_SC_X5_OFF, 0); 104 c->dwarf.loc[UNW_AARCH64_X6] = DWARF_LOC (sc_addr + LINUX_SC_X6_OFF, 0); 105 c->dwarf.loc[UNW_AARCH64_X7] = DWARF_LOC (sc_addr + LINUX_SC_X7_OFF, 0); 106 c->dwarf.loc[UNW_AARCH64_X8] = DWARF_LOC (sc_addr + LINUX_SC_X8_OFF, 0); 107 c->dwarf.loc[UNW_AARCH64_X9] = DWARF_LOC (sc_addr + LINUX_SC_X9_OFF, 0); 108 c->dwarf.loc[UNW_AARCH64_X10] = DWARF_LOC (sc_addr + LINUX_SC_X10_OFF, 0); 109 c->dwarf.loc[UNW_AARCH64_X11] = DWARF_LOC (sc_addr + LINUX_SC_X11_OFF, 0); 110 c->dwarf.loc[UNW_AARCH64_X12] = DWARF_LOC (sc_addr + LINUX_SC_X12_OFF, 0); 111 c->dwarf.loc[UNW_AARCH64_X13] = DWARF_LOC (sc_addr + LINUX_SC_X13_OFF, 0); 112 c->dwarf.loc[UNW_AARCH64_X14] = DWARF_LOC (sc_addr + LINUX_SC_X14_OFF, 0); 113 c->dwarf.loc[UNW_AARCH64_X15] = DWARF_LOC (sc_addr + LINUX_SC_X15_OFF, 0); 114 c->dwarf.loc[UNW_AARCH64_X16] = DWARF_LOC (sc_addr + LINUX_SC_X16_OFF, 0); 115 c->dwarf.loc[UNW_AARCH64_X17] = DWARF_LOC (sc_addr + LINUX_SC_X17_OFF, 0); 116 c->dwarf.loc[UNW_AARCH64_X18] = DWARF_LOC (sc_addr + LINUX_SC_X18_OFF, 0); 117 c->dwarf.loc[UNW_AARCH64_X19] = DWARF_LOC (sc_addr + LINUX_SC_X19_OFF, 0); 118 c->dwarf.loc[UNW_AARCH64_X20] = DWARF_LOC (sc_addr + LINUX_SC_X20_OFF, 0); 119 c->dwarf.loc[UNW_AARCH64_X21] = DWARF_LOC (sc_addr + LINUX_SC_X21_OFF, 0); 120 c->dwarf.loc[UNW_AARCH64_X22] = DWARF_LOC (sc_addr + LINUX_SC_X22_OFF, 0); 121 c->dwarf.loc[UNW_AARCH64_X23] = DWARF_LOC (sc_addr + LINUX_SC_X23_OFF, 0); 122 c->dwarf.loc[UNW_AARCH64_X24] = DWARF_LOC (sc_addr + LINUX_SC_X24_OFF, 0); 123 c->dwarf.loc[UNW_AARCH64_X25] = DWARF_LOC (sc_addr + LINUX_SC_X25_OFF, 0); 124 c->dwarf.loc[UNW_AARCH64_X26] = DWARF_LOC (sc_addr + LINUX_SC_X26_OFF, 0); 125 c->dwarf.loc[UNW_AARCH64_X27] = DWARF_LOC (sc_addr + LINUX_SC_X27_OFF, 0); 126 c->dwarf.loc[UNW_AARCH64_X28] = DWARF_LOC (sc_addr + LINUX_SC_X28_OFF, 0); 127 c->dwarf.loc[UNW_AARCH64_X29] = DWARF_LOC (sc_addr + LINUX_SC_X29_OFF, 0); 128 c->dwarf.loc[UNW_AARCH64_X30] = DWARF_LOC (sc_addr + LINUX_SC_X30_OFF, 0); 129 c->dwarf.loc[UNW_AARCH64_SP] = DWARF_LOC (sc_addr + LINUX_SC_SP_OFF, 0); 130 c->dwarf.loc[UNW_AARCH64_PC] = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0); 131 c->dwarf.loc[UNW_AARCH64_PSTATE] = DWARF_LOC (sc_addr + LINUX_SC_PSTATE_OFF, 0); 132 133 /* Set SP/CFA and PC/IP. */ 134 dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_SP], &c->dwarf.cfa); 135 dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_PC], &c->dwarf.ip); 136 137 c->dwarf.pi_valid = 0; 138 139 return 1; 140#else 141 return -UNW_EBADFRAME; 142#endif 143} 144