/* 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 <stdlib.h> #include <string.h> #include "unwind_i.h" #ifdef UNW_REMOTE_ONLY /* unw_local_addr_space is a NULL pointer in this case. */ PROTECTED unw_addr_space_t unw_local_addr_space; #else /* !UNW_REMOTE_ONLY */ static struct unw_addr_space local_addr_space; PROTECTED unw_addr_space_t unw_local_addr_space = &local_addr_space; /* Return the address of the 64-bit slot in UC for REG (even for o32, where registers are 32-bit, the slots are still 64-bit). */ static inline void * uc_addr (ucontext_t *uc, int reg) { if (reg >= UNW_MIPS_R0 && reg < UNW_MIPS_R0 + 32) return &uc->uc_mcontext.gregs[reg - UNW_MIPS_R0]; else if (reg == UNW_MIPS_PC) return &uc->uc_mcontext.pc; else return NULL; } # ifdef UNW_LOCAL_ONLY HIDDEN void * tdep_uc_addr (ucontext_t *uc, int reg) { char *addr = uc_addr (uc, reg); if (reg >= UNW_MIPS_R0 && reg <= UNW_MIPS_R31 && tdep_big_endian (unw_local_addr_space) && unw_local_addr_space->abi == UNW_MIPS_ABI_O32) addr += 4; return addr; } # endif /* UNW_LOCAL_ONLY */ HIDDEN unw_dyn_info_list_t _U_dyn_info_list; /* XXX fix me: there is currently no way to locate the dyn-info list by a remote unwinder. On ia64, this is done via a special unwind-table entry. Perhaps something similar can be done with DWARF2 unwind info. */ static void put_unwind_info (unw_addr_space_t as, unw_proc_info_t *proc_info, void *arg) { /* it's a no-op */ } static int get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr, void *arg) { *dyn_info_list_addr = (unw_word_t) (intptr_t) &_U_dyn_info_list; return 0; } static int access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write, void *arg) { if (write) { /* ANDROID support update. */ #ifdef UNW_LOCAL_ONLY if (map_local_is_writable (addr)) { #endif Debug (16, "mem[%llx] <- %llx\n", (long long) addr, (long long) *val); *(unw_word_t *) (uintptr_t) addr = *val; #ifdef UNW_LOCAL_ONLY } else { Debug (16, "Unwritable memory mem[%llx] <- %llx\n", (long long) addr, (long long) *val); return -1; } #endif /* End of ANDROID update. */ } else { /* ANDROID support update. */ #ifdef UNW_LOCAL_ONLY if (map_local_is_readable (addr)) { #endif *val = *(unw_word_t *) (uintptr_t) addr; Debug (16, "mem[%llx] -> %llx\n", (long long) addr, (long long) *val); #ifdef UNW_LOCAL_ONLY } else { Debug (16, "Unreadable memory mem[%llx] -> XXX\n", (long long) addr); return -1; } #endif /* End of ANDROID update. */ } return 0; } static int access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write, void *arg) { unw_word_t *addr; ucontext_t *uc = arg; if (unw_is_fpreg (reg)) goto badreg; Debug (16, "reg = %s\n", unw_regname (reg)); if (!(addr = uc_addr (uc, reg))) goto badreg; if (write) { *(unw_word_t *) (intptr_t) addr = (mips_reg_t) *val; Debug (12, "%s <- %llx\n", unw_regname (reg), (long long) *val); } else { *val = (mips_reg_t) *(unw_word_t *) (intptr_t) addr; Debug (12, "%s -> %llx\n", unw_regname (reg), (long long) *val); } return 0; badreg: Debug (1, "bad register number %u\n", reg); return -UNW_EBADREG; } static int access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val, int write, void *arg) { ucontext_t *uc = arg; unw_fpreg_t *addr; if (!unw_is_fpreg (reg)) goto badreg; if (!(addr = uc_addr (uc, reg))) goto badreg; if (write) { Debug (12, "%s <- %08lx.%08lx.%08lx\n", unw_regname (reg), ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]); *(unw_fpreg_t *) (intptr_t) addr = *val; } else { *val = *(unw_fpreg_t *) (intptr_t) addr; Debug (12, "%s -> %08lx.%08lx.%08lx\n", unw_regname (reg), ((long *)val)[0], ((long *)val)[1], ((long *)val)[2]); } return 0; badreg: Debug (1, "bad register number %u\n", reg); /* attempt to access a non-preserved register */ return -UNW_EBADREG; } static int get_static_proc_name (unw_addr_space_t as, unw_word_t ip, char *buf, size_t buf_len, unw_word_t *offp, void *arg) { return elf_w (get_proc_name) (as, getpid (), ip, buf, buf_len, offp, arg); } static int access_mem_unrestricted (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write, void *arg) { if (write) return -1; *val = *(unw_word_t *) (uintptr_t) addr; Debug (16, "mem[%llx] <- %llx\n", (long long) addr, (long long) *val); return 0; } // This initializes just enough of the address space to call the // access memory function. PROTECTED void unw_local_access_addr_space_init (unw_addr_space_t as) { memset (as, 0, sizeof (*as)); as->acc.access_mem = access_mem_unrestricted; } HIDDEN void mips_local_addr_space_init (void) { memset (&local_addr_space, 0, sizeof (local_addr_space)); local_addr_space.big_endian = (__BYTE_ORDER == __BIG_ENDIAN); #if _MIPS_SIM == _ABIO32 local_addr_space.abi = UNW_MIPS_ABI_O32; #elif _MIPS_SIM == _ABIN32 local_addr_space.abi = UNW_MIPS_ABI_N32; #elif _MIPS_SIM == _ABI64 local_addr_space.abi = UNW_MIPS_ABI_N64; #else # error Unsupported ABI #endif local_addr_space.addr_size = sizeof (void *); local_addr_space.caching_policy = UNW_CACHE_GLOBAL; local_addr_space.acc.find_proc_info = dwarf_find_proc_info; local_addr_space.acc.put_unwind_info = put_unwind_info; local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr; local_addr_space.acc.access_mem = access_mem; local_addr_space.acc.access_reg = access_reg; local_addr_space.acc.access_fpreg = access_fpreg; local_addr_space.acc.resume = NULL; /* mips_local_resume? FIXME! */ local_addr_space.acc.get_proc_name = get_static_proc_name; unw_flush_cache (&local_addr_space, 0, 0); map_local_init (); } #endif /* !UNW_REMOTE_ONLY */