/* libunwind - a platform-independent unwind library Copyright (C) 2008 CodeSourcery Copyright (C) 2015 Imagination Technologies Limited Copyright (C) 2021 Loongson Technology Corporation Limited 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" static int loongarch64_handle_signal_frame (unw_cursor_t *cursor) { struct cursor *c = (struct cursor *) cursor; unw_word_t sc_addr, sp_addr = c->dwarf.cfa; unw_word_t ra, fp; int i, ret; if (unw_is_signal_frame (cursor)) { sc_addr = sp_addr + sizeof (siginfo_t) + LINUX_UC_MCONTEXT_OFF; } else { c->sigcontext_format = LOONGARCH64_SCF_NONE; return -UNW_EUNSPEC; } c->sigcontext_addr = sc_addr; /* 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; c->sigcontext_format = LOONGARCH64_SCF_LINUX_RT_SIGFRAME; for (i = 0; i < DWARF_NUM_PRESERVED_REGS; ++i) c->dwarf.loc[i] = DWARF_NULL_LOC; /* 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_LOONGARCH64_R0] = DWARF_LOC (sc_addr + LINUX_SC_R0_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R1] = DWARF_LOC (sc_addr + LINUX_SC_R1_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R2] = DWARF_LOC (sc_addr + LINUX_SC_R2_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R3] = DWARF_LOC (sc_addr + LINUX_SC_R3_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R4] = DWARF_LOC (sc_addr + LINUX_SC_R4_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R5] = DWARF_LOC (sc_addr + LINUX_SC_R5_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R6] = DWARF_LOC (sc_addr + LINUX_SC_R6_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R7] = DWARF_LOC (sc_addr + LINUX_SC_R7_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R8] = DWARF_LOC (sc_addr + LINUX_SC_R8_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R9] = DWARF_LOC (sc_addr + LINUX_SC_R9_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R10] = DWARF_LOC (sc_addr + LINUX_SC_R10_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R11] = DWARF_LOC (sc_addr + LINUX_SC_R11_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R12] = DWARF_LOC (sc_addr + LINUX_SC_R12_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R13] = DWARF_LOC (sc_addr + LINUX_SC_R13_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R14] = DWARF_LOC (sc_addr + LINUX_SC_R14_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R15] = DWARF_LOC (sc_addr + LINUX_SC_R15_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R16] = DWARF_LOC (sc_addr + LINUX_SC_R16_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R17] = DWARF_LOC (sc_addr + LINUX_SC_R17_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R18] = DWARF_LOC (sc_addr + LINUX_SC_R18_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R19] = DWARF_LOC (sc_addr + LINUX_SC_R19_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R20] = DWARF_LOC (sc_addr + LINUX_SC_R20_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R21] = DWARF_LOC (sc_addr + LINUX_SC_R21_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R22] = DWARF_LOC (sc_addr + LINUX_SC_R22_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R23] = DWARF_LOC (sc_addr + LINUX_SC_R23_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R24] = DWARF_LOC (sc_addr + LINUX_SC_R24_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R25] = DWARF_LOC (sc_addr + LINUX_SC_R25_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R26] = DWARF_LOC (sc_addr + LINUX_SC_R26_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R27] = DWARF_LOC (sc_addr + LINUX_SC_R27_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R28] = DWARF_LOC (sc_addr + LINUX_SC_R28_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R29] = DWARF_LOC (sc_addr + LINUX_SC_R29_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R30] = DWARF_LOC (sc_addr + LINUX_SC_R30_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_R31] = DWARF_LOC (sc_addr + LINUX_SC_R31_OFF, 0); c->dwarf.loc[UNW_LOONGARCH64_PC] = DWARF_LOC (sc_addr + LINUX_SC_PC_OFF, 0); /* Set SP/CFA and PC/IP. */ dwarf_get (&c->dwarf, c->dwarf.loc[UNW_LOONGARCH64_R3], &c->dwarf.cfa); 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_R1_OFF, 0), &ra)) < 0) return ret; if ((ret = dwarf_get(&c->dwarf, DWARF_LOC(sc_addr + LINUX_SC_R22_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; } int unw_step (unw_cursor_t *cursor) { struct cursor *c = (struct cursor *) cursor; int validate = c->validate; int ret; Debug (1, "(cursor=%p, ip=0x%016lx, sp=0x%016lx)\n", c, c->dwarf.ip, c->dwarf.cfa); ret = unw_is_signal_frame (cursor); if (ret > 0) return loongarch64_handle_signal_frame (cursor); /* Not a signal frame, try DWARF-based unwinding. */ ret = dwarf_step (&c->dwarf); /* Restore default memory validation state */ c->validate = validate; if (unlikely (ret == -UNW_ESTOPUNWIND)) return ret; /* Dwarf unwinding didn't work, stop. */ if (unlikely (ret < 0)) return 0; return (c->dwarf.ip == 0) ? 0 : 1; }