| /* libunwind - a platform-independent unwind library |
| Copyright (C) 2008 CodeSourcery |
| Copyright (C) 2011-2013 Linaro Limited |
| Copyright (C) 2012 Tommi Rantala <tt.rantala@gmail.com> |
| |
| This file is part of libunwind. |
| |
| Permission is hereby granted, free of charge, to any person obtaining |
| a copy of this software and associated documentation files (the |
| "Software"), to deal in the Software without restriction, including |
| without limitation the rights to use, copy, modify, merge, publish, |
| distribute, sublicense, and/or sell copies of the Software, and to |
| permit persons to whom the Software is furnished to do so, subject to |
| the following conditions: |
| |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
| LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
| OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
| WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ |
| |
| #include "unwind_i.h" |
| #include "offsets.h" |
| |
| PROTECTED int |
| unw_handle_signal_frame (unw_cursor_t *cursor) |
| { |
| struct cursor *c = (struct cursor *) cursor; |
| int ret; |
| unw_word_t sc_addr, sp, sp_addr = c->dwarf.cfa; |
| struct dwarf_loc sp_loc = DWARF_LOC (sp_addr, 0); |
| |
| if ((ret = dwarf_get (&c->dwarf, sp_loc, &sp)) < 0) |
| return -UNW_EUNSPEC; |
| |
| ret = unw_is_signal_frame (cursor); |
| Debug(1, "unw_is_signal_frame()=%d\n", ret); |
| |
| /* Save the SP and PC to be able to return execution at this point |
| later in time (unw_resume). */ |
| c->sigcontext_sp = c->dwarf.cfa; |
| c->sigcontext_pc = c->dwarf.ip; |
| |
| if (ret) |
| { |
| c->sigcontext_format = AARCH64_SCF_LINUX_RT_SIGFRAME; |
| sc_addr = sp_addr + sizeof (siginfo_t) + LINUX_UC_MCONTEXT_OFF; |
| } |
| else |
| return -UNW_EUNSPEC; |
| |
| c->sigcontext_addr = sc_addr; |
| |
| /* Update the dwarf cursor. |
| Set the location of the registers to the corresponding addresses of the |
| uc_mcontext / sigcontext structure contents. */ |
| c->dwarf.loc[UNW_AARCH64_X0] = DWARF_LOC (sc_addr + LINUX_SC_X0_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X1] = DWARF_LOC (sc_addr + LINUX_SC_X1_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X2] = DWARF_LOC (sc_addr + LINUX_SC_X2_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X3] = DWARF_LOC (sc_addr + LINUX_SC_X3_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X4] = DWARF_LOC (sc_addr + LINUX_SC_X4_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X5] = DWARF_LOC (sc_addr + LINUX_SC_X5_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X6] = DWARF_LOC (sc_addr + LINUX_SC_X6_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X7] = DWARF_LOC (sc_addr + LINUX_SC_X7_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X8] = DWARF_LOC (sc_addr + LINUX_SC_X8_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X9] = DWARF_LOC (sc_addr + LINUX_SC_X9_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X10] = DWARF_LOC (sc_addr + LINUX_SC_X10_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X11] = DWARF_LOC (sc_addr + LINUX_SC_X11_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X12] = DWARF_LOC (sc_addr + LINUX_SC_X12_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X13] = DWARF_LOC (sc_addr + LINUX_SC_X13_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X14] = DWARF_LOC (sc_addr + LINUX_SC_X14_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X15] = DWARF_LOC (sc_addr + LINUX_SC_X15_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X16] = DWARF_LOC (sc_addr + LINUX_SC_X16_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X17] = DWARF_LOC (sc_addr + LINUX_SC_X17_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X18] = DWARF_LOC (sc_addr + LINUX_SC_X18_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X19] = DWARF_LOC (sc_addr + LINUX_SC_X19_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X20] = DWARF_LOC (sc_addr + LINUX_SC_X20_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X21] = DWARF_LOC (sc_addr + LINUX_SC_X21_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X22] = DWARF_LOC (sc_addr + LINUX_SC_X22_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X23] = DWARF_LOC (sc_addr + LINUX_SC_X23_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X24] = DWARF_LOC (sc_addr + LINUX_SC_X24_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X25] = DWARF_LOC (sc_addr + LINUX_SC_X25_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X26] = DWARF_LOC (sc_addr + LINUX_SC_X26_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X27] = DWARF_LOC (sc_addr + LINUX_SC_X27_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X28] = DWARF_LOC (sc_addr + LINUX_SC_X28_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X29] = DWARF_LOC (sc_addr + LINUX_SC_X29_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_X30] = DWARF_LOC (sc_addr + LINUX_SC_X30_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_SP] = DWARF_LOC (sc_addr + LINUX_SC_SP_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_PC] = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0); |
| c->dwarf.loc[UNW_AARCH64_PSTATE] = DWARF_LOC (sc_addr + LINUX_SC_PSTATE_OFF, 0); |
| |
| /* Set SP/CFA and PC/IP. */ |
| dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_SP], &c->dwarf.cfa); |
| dwarf_get (&c->dwarf, c->dwarf.loc[UNW_AARCH64_PC], &c->dwarf.ip); |
| |
| c->dwarf.pi_valid = 0; |
| |
| return 1; |
| } |
| |
| PROTECTED int |
| unw_step (unw_cursor_t *cursor) |
| { |
| struct cursor *c = (struct cursor *) cursor; |
| int ret = -UNW_ENOINFO; |
| |
| Debug (1, "(cursor=%p, ip=0x%016lx, cfa=0x%016lx))\n", |
| c, c->dwarf.ip, c->dwarf.cfa); |
| |
| unw_word_t old_ip = c->dwarf.ip; |
| unw_word_t old_cfa = c->dwarf.cfa; |
| |
| /* Check if this is a signal frame. */ |
| if (unw_is_signal_frame (cursor)) |
| /* ANDROID support update. */ |
| ret = unw_handle_signal_frame (cursor); |
| /* End ANDROID update. */ |
| |
| /* ANDROID support update. */ |
| if (ret < 0) |
| { |
| ret = dwarf_step (&c->dwarf); |
| Debug(1, "dwarf_step()=%d\n", ret); |
| } |
| |
| if (ret < 0 && c->dwarf.frame == 0) |
| { |
| /* If this is the first frame, the code may be executing garbage |
| * in the middle of nowhere. In this case, try using the lr as |
| * the pc. |
| */ |
| unw_word_t lr; |
| if (dwarf_get(&c->dwarf, c->dwarf.loc[UNW_AARCH64_X30], &lr) >= 0) |
| { |
| if (lr != c->dwarf.ip) |
| { |
| ret = 1; |
| c->dwarf.ip = lr; |
| } |
| } |
| } |
| /* End ANDROID update. */ |
| |
| if (ret >= 0) |
| { |
| if (c->dwarf.ip >= 4) |
| c->dwarf.ip -= 4; |
| /* If the decode yields the exact same ip/cfa as before, then indicate |
| the unwind is complete. */ |
| if (c->dwarf.ip == old_ip && c->dwarf.cfa == old_cfa) |
| { |
| Dprintf ("%s: ip and cfa unchanged; stopping here (ip=0x%lx)\n", |
| __FUNCTION__, (long) c->dwarf.ip); |
| return -UNW_EBADFRAME; |
| } |
| c->dwarf.frame++; |
| } |
| |
| if (unlikely (ret == -UNW_ESTOPUNWIND)) |
| return ret; |
| |
| if (unlikely (ret < 0)) |
| return 0; |
| |
| return (c->dwarf.ip == 0) ? 0 : 1; |
| } |