| /* libunwind - a platform-independent unwind library |
| Copyright (C) 2008 CodeSourcery |
| Copyright 2011 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 == 1) |
| { |
| /* Handle non-RT signal frame. */ |
| c->sigcontext_format = SH_SCF_LINUX_SIGFRAME; |
| sc_addr = sp_addr; |
| } |
| else if (ret == 2) |
| { |
| /* Handle RT signal frame. */ |
| c->sigcontext_format = SH_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_SH_R0] = DWARF_LOC (sc_addr + LINUX_SC_R0_OFF, 0); |
| c->dwarf.loc[UNW_SH_R1] = DWARF_LOC (sc_addr + LINUX_SC_R1_OFF, 0); |
| c->dwarf.loc[UNW_SH_R2] = DWARF_LOC (sc_addr + LINUX_SC_R2_OFF, 0); |
| c->dwarf.loc[UNW_SH_R3] = DWARF_LOC (sc_addr + LINUX_SC_R3_OFF, 0); |
| c->dwarf.loc[UNW_SH_R4] = DWARF_LOC (sc_addr + LINUX_SC_R4_OFF, 0); |
| c->dwarf.loc[UNW_SH_R5] = DWARF_LOC (sc_addr + LINUX_SC_R5_OFF, 0); |
| c->dwarf.loc[UNW_SH_R6] = DWARF_LOC (sc_addr + LINUX_SC_R6_OFF, 0); |
| c->dwarf.loc[UNW_SH_R7] = DWARF_LOC (sc_addr + LINUX_SC_R7_OFF, 0); |
| c->dwarf.loc[UNW_SH_R8] = DWARF_LOC (sc_addr + LINUX_SC_R8_OFF, 0); |
| c->dwarf.loc[UNW_SH_R9] = DWARF_LOC (sc_addr + LINUX_SC_R9_OFF, 0); |
| c->dwarf.loc[UNW_SH_R10] = DWARF_LOC (sc_addr + LINUX_SC_R10_OFF, 0); |
| c->dwarf.loc[UNW_SH_R11] = DWARF_LOC (sc_addr + LINUX_SC_R11_OFF, 0); |
| c->dwarf.loc[UNW_SH_R12] = DWARF_LOC (sc_addr + LINUX_SC_R12_OFF, 0); |
| c->dwarf.loc[UNW_SH_R13] = DWARF_LOC (sc_addr + LINUX_SC_R13_OFF, 0); |
| c->dwarf.loc[UNW_SH_R14] = DWARF_LOC (sc_addr + LINUX_SC_R14_OFF, 0); |
| c->dwarf.loc[UNW_SH_R15] = DWARF_LOC (sc_addr + LINUX_SC_R15_OFF, 0); |
| c->dwarf.loc[UNW_SH_PR] = DWARF_LOC (sc_addr + LINUX_SC_PR_OFF, 0); |
| c->dwarf.loc[UNW_SH_PC] = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0); |
| |
| /* Set SP/CFA and PC/IP. */ |
| dwarf_get (&c->dwarf, c->dwarf.loc[UNW_SH_R15], &c->dwarf.cfa); |
| dwarf_get (&c->dwarf, c->dwarf.loc[UNW_SH_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; |
| |
| Debug (1, "(cursor=%p)\n", c); |
| |
| if (unw_is_signal_frame (cursor)) |
| return unw_handle_signal_frame (cursor); |
| |
| ret = dwarf_step (&c->dwarf); |
| |
| if (unlikely (ret == -UNW_ESTOPUNWIND)) |
| return ret; |
| |
| if (unlikely (ret < 0)) |
| return 0; |
| |
| return (c->dwarf.ip == 0) ? 0 : 1; |
| } |