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https://github.com/tobast/libunwind-eh_elf.git
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79c2c254a7
Add MIPS support to the coredump library. Explicit support for the MIPS program counter register is added so that we can start backtracing from the program counter value we read from a core dump. The PC register support was not strictly required for local backtracing, and we will in fact just plug the return address to the PC register in getcontext(). I have only tested the 32bit "OABI" paths.
210 lines
5.8 KiB
C
210 lines
5.8 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2008 CodeSourcery
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This file is part of libunwind.
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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"Software"), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include <stdlib.h>
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#include <string.h>
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#include "unwind_i.h"
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#ifdef UNW_REMOTE_ONLY
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/* unw_local_addr_space is a NULL pointer in this case. */
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PROTECTED unw_addr_space_t unw_local_addr_space;
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#else /* !UNW_REMOTE_ONLY */
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static struct unw_addr_space local_addr_space;
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PROTECTED unw_addr_space_t unw_local_addr_space = &local_addr_space;
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/* Return the address of the 64-bit slot in UC for REG (even for o32,
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where registers are 32-bit, the slots are still 64-bit). */
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static inline void *
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uc_addr (ucontext_t *uc, int reg)
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{
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if (reg >= UNW_MIPS_R0 && reg < UNW_MIPS_R0 + 32)
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return &uc->uc_mcontext.gregs[reg - UNW_MIPS_R0];
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else if (reg == UNW_MIPS_PC)
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return &uc->uc_mcontext.pc;
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else
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return NULL;
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}
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# ifdef UNW_LOCAL_ONLY
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HIDDEN void *
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tdep_uc_addr (ucontext_t *uc, int reg)
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{
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char *addr = uc_addr (uc, reg);
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if (reg >= UNW_MIPS_R0 && reg <= UNW_MIPS_R31
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&& tdep_big_endian (unw_local_addr_space)
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&& unw_local_addr_space->abi == UNW_MIPS_ABI_O32)
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addr += 4;
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return addr;
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}
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# endif /* UNW_LOCAL_ONLY */
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HIDDEN unw_dyn_info_list_t _U_dyn_info_list;
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/* XXX fix me: there is currently no way to locate the dyn-info list
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by a remote unwinder. On ia64, this is done via a special
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unwind-table entry. Perhaps something similar can be done with
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DWARF2 unwind info. */
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static void
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put_unwind_info (unw_addr_space_t as, unw_proc_info_t *proc_info, void *arg)
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{
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/* it's a no-op */
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}
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static int
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get_dyn_info_list_addr (unw_addr_space_t as, unw_word_t *dyn_info_list_addr,
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void *arg)
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{
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*dyn_info_list_addr = (unw_word_t) (intptr_t) &_U_dyn_info_list;
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return 0;
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}
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static int
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access_mem (unw_addr_space_t as, unw_word_t addr, unw_word_t *val, int write,
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void *arg)
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{
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if (write)
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{
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Debug (16, "mem[%llx] <- %llx\n", (long long) addr, (long long) *val);
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*(unw_word_t *) (intptr_t) addr = *val;
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}
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else
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{
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*val = *(unw_word_t *) (intptr_t) addr;
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Debug (16, "mem[%llx] -> %llx\n", (long long) addr, (long long) *val);
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}
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return 0;
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}
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static int
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access_reg (unw_addr_space_t as, unw_regnum_t reg, unw_word_t *val, int write,
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void *arg)
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{
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unw_word_t *addr;
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ucontext_t *uc = arg;
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if (unw_is_fpreg (reg))
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goto badreg;
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Debug (16, "reg = %s\n", unw_regname (reg));
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if (!(addr = uc_addr (uc, reg)))
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goto badreg;
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if (write)
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{
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*(unw_word_t *) (intptr_t) addr = (mips_reg_t) *val;
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Debug (12, "%s <- %llx\n", unw_regname (reg), (long long) *val);
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}
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else
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{
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*val = (mips_reg_t) *(unw_word_t *) (intptr_t) addr;
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Debug (12, "%s -> %llx\n", unw_regname (reg), (long long) *val);
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}
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return 0;
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badreg:
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Debug (1, "bad register number %u\n", reg);
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return -UNW_EBADREG;
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}
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static int
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access_fpreg (unw_addr_space_t as, unw_regnum_t reg, unw_fpreg_t *val,
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int write, void *arg)
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{
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ucontext_t *uc = arg;
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unw_fpreg_t *addr;
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if (!unw_is_fpreg (reg))
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goto badreg;
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if (!(addr = uc_addr (uc, reg)))
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goto badreg;
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if (write)
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{
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Debug (12, "%s <- %08lx.%08lx.%08lx\n", unw_regname (reg),
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((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
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*(unw_fpreg_t *) (intptr_t) addr = *val;
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}
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else
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{
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*val = *(unw_fpreg_t *) (intptr_t) addr;
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Debug (12, "%s -> %08lx.%08lx.%08lx\n", unw_regname (reg),
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((long *)val)[0], ((long *)val)[1], ((long *)val)[2]);
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}
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return 0;
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badreg:
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Debug (1, "bad register number %u\n", reg);
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/* attempt to access a non-preserved register */
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return -UNW_EBADREG;
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}
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static int
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get_static_proc_name (unw_addr_space_t as, unw_word_t ip,
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char *buf, size_t buf_len, unw_word_t *offp,
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void *arg)
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{
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return elf_w (get_proc_name) (as, getpid (), ip, buf, buf_len, offp);
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}
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HIDDEN void
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mips_local_addr_space_init (void)
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{
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memset (&local_addr_space, 0, sizeof (local_addr_space));
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local_addr_space.big_endian = (__BYTE_ORDER == __BIG_ENDIAN);
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#if _MIPS_SIM == _ABIO32
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local_addr_space.abi = UNW_MIPS_ABI_O32;
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#elif _MIPS_SIM == _ABIN32
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local_addr_space.abi = UNW_MIPS_ABI_N32;
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#elif _MIPS_SIM == _ABI64
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local_addr_space.abi = UNW_MIPS_ABI_N64;
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#else
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# error Unsupported ABI
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#endif
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local_addr_space.addr_size = sizeof (void *);
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local_addr_space.caching_policy = UNW_CACHE_GLOBAL;
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local_addr_space.acc.find_proc_info = dwarf_find_proc_info;
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local_addr_space.acc.put_unwind_info = put_unwind_info;
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local_addr_space.acc.get_dyn_info_list_addr = get_dyn_info_list_addr;
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local_addr_space.acc.access_mem = access_mem;
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local_addr_space.acc.access_reg = access_reg;
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local_addr_space.acc.access_fpreg = access_fpreg;
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local_addr_space.acc.resume = 0; /* mips_local_resume? FIXME! */
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local_addr_space.acc.get_proc_name = get_static_proc_name;
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unw_flush_cache (&local_addr_space, 0, 0);
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}
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#endif /* !UNW_REMOTE_ONLY */
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