| /* libunwind - a platform-independent unwind library |
| Copyright (C) 2008 CodeSourcery |
| |
| 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; |
| unw_word_t sc_addr, sp, sp_addr = c->dwarf.cfa; |
| unw_word_t ra, fp; |
| int ret; |
| |
| /* FIXME (simon): 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; |
| |
| switch (unw_is_signal_frame (cursor)) { |
| case 1: |
| sc_addr = sp_addr + LINUX_SF_TRAMP_SIZE + sizeof (siginfo_t) + |
| LINUX_UC_MCONTEXT_OFF; |
| break; |
| case 2: |
| sc_addr = sp_addr + LINUX_UC_MCONTEXT_OFF; |
| break; |
| default: |
| return -UNW_EUNSPEC; |
| } |
| |
| if (tdep_big_endian(c->dwarf.as)) |
| sc_addr += 4; |
| |
| c->sigcontext_addr = sc_addr; |
| |
| /* Update the dwarf cursor. */ |
| c->dwarf.loc[UNW_MIPS_R0] = DWARF_LOC (sc_addr + LINUX_SC_R0_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R1] = DWARF_LOC (sc_addr + LINUX_SC_R1_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R2] = DWARF_LOC (sc_addr + LINUX_SC_R2_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R3] = DWARF_LOC (sc_addr + LINUX_SC_R3_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R4] = DWARF_LOC (sc_addr + LINUX_SC_R4_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R5] = DWARF_LOC (sc_addr + LINUX_SC_R5_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R6] = DWARF_LOC (sc_addr + LINUX_SC_R6_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R7] = DWARF_LOC (sc_addr + LINUX_SC_R7_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R8] = DWARF_LOC (sc_addr + LINUX_SC_R8_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R9] = DWARF_LOC (sc_addr + LINUX_SC_R9_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R10] = DWARF_LOC (sc_addr + LINUX_SC_R10_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R11] = DWARF_LOC (sc_addr + LINUX_SC_R11_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R12] = DWARF_LOC (sc_addr + LINUX_SC_R12_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R13] = DWARF_LOC (sc_addr + LINUX_SC_R13_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R14] = DWARF_LOC (sc_addr + LINUX_SC_R14_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R15] = DWARF_LOC (sc_addr + LINUX_SC_R15_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R16] = DWARF_LOC (sc_addr + LINUX_SC_R16_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R17] = DWARF_LOC (sc_addr + LINUX_SC_R17_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R18] = DWARF_LOC (sc_addr + LINUX_SC_R18_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R19] = DWARF_LOC (sc_addr + LINUX_SC_R19_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R20] = DWARF_LOC (sc_addr + LINUX_SC_R20_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R21] = DWARF_LOC (sc_addr + LINUX_SC_R21_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R22] = DWARF_LOC (sc_addr + LINUX_SC_R22_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R23] = DWARF_LOC (sc_addr + LINUX_SC_R23_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R24] = DWARF_LOC (sc_addr + LINUX_SC_R24_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R25] = DWARF_LOC (sc_addr + LINUX_SC_R25_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R26] = DWARF_LOC (sc_addr + LINUX_SC_R26_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R27] = DWARF_LOC (sc_addr + LINUX_SC_R27_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R28] = DWARF_LOC (sc_addr + LINUX_SC_R28_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R29] = DWARF_LOC (sc_addr + LINUX_SC_R29_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R30] = DWARF_LOC (sc_addr + LINUX_SC_R30_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_R31] = DWARF_LOC (sc_addr + LINUX_SC_R31_OFF, 0); |
| c->dwarf.loc[UNW_MIPS_PC] = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0); |
| |
| /* Set SP/CFA and PC/IP. */ |
| dwarf_get (&c->dwarf, c->dwarf.loc[UNW_MIPS_R29], &c->dwarf.cfa); |
| //dwarf_get (&c->dwarf, c->dwarf.loc[UNW_MIPS_R31], &c->dwarf.ip); |
| |
| if ((ret = dwarf_get(&c->dwarf, DWARF_LOC(sc_addr + LINUX_SC_PC_OFF, 0), |
| &c->dwarf.ip)) < 0) |
| return ret; |
| |
| if ((ret = dwarf_get(&c->dwarf, DWARF_LOC(sc_addr + LINUX_SC_R31_OFF, 0), |
| &ra)) < 0) |
| return ret; |
| if ((ret = dwarf_get(&c->dwarf, DWARF_LOC(sc_addr + LINUX_SC_R30_OFF, 0), |
| &fp)) < 0) |
| return ret; |
| |
| Debug (2, "SH (ip=0x%016llx, ra=0x%016llx, sp=0x%016llx, fp=0x%016llx)\n", |
| (unsigned long long)c->dwarf.ip, (unsigned long long)ra, |
| (unsigned long long)c->dwarf.cfa, (unsigned long long)fp); |
| |
| c->dwarf.pi_valid = 0; |
| c->dwarf.use_prev_instr = 0; |
| |
| return 1; |
| } |
| |
| PROTECTED int |
| unw_step (unw_cursor_t *cursor) |
| { |
| struct cursor *c = (struct cursor *) cursor; |
| int ret; |
| |
| unw_word_t old_ip = c->dwarf.ip; |
| unw_word_t old_cfa = c->dwarf.cfa; |
| |
| ret = unw_handle_signal_frame (cursor); |
| if (ret < 0) |
| /* Not a signal frame, try DWARF-based unwinding. */ |
| ret = dwarf_step (&c->dwarf); |
| |
| if (unlikely (ret == -UNW_ESTOPUNWIND)) |
| return ret; |
| |
| /* Dwarf unwinding didn't work, stop. */ |
| if (unlikely (ret < 0)) |
| return 0; |
| |
| /* 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; |
| } |
| |
| return (c->dwarf.ip == 0) ? 0 : 1; |
| } |