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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.
157 lines
4.1 KiB
C
157 lines
4.1 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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#ifndef LIBUNWIND_H
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#define LIBUNWIND_H
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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#include <inttypes.h>
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#include <ucontext.h>
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#ifdef mips
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# undef mips
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#endif
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#define UNW_TARGET mips
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#define UNW_TARGET_MIPS 1
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#define _U_TDEP_QP_TRUE 0 /* see libunwind-dynamic.h */
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/* This needs to be big enough to accommodate "struct cursor", while
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leaving some slack for future expansion. Changing this value will
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require recompiling all users of this library. Stack allocation is
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relatively cheap and unwind-state copying is relatively rare, so we
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want to err on making it rather too big than too small. */
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/* FIXME for MIPS. Too big? What do other things use for similar tasks? */
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#define UNW_TDEP_CURSOR_LEN 4096
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/* The size of a "word" varies on MIPS. This type is used for memory
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addresses and register values. To allow a single library to support
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multiple ABIs, and to support N32 at all, we must use a 64-bit type
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even when addresses are only 32 bits. */
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typedef uint64_t unw_word_t;
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typedef int32_t unw_sword_t;
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/* FIXME: MIPS ABIs. */
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typedef long double unw_tdep_fpreg_t;
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typedef enum
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{
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UNW_MIPS_R0,
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UNW_MIPS_R1,
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UNW_MIPS_R2,
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UNW_MIPS_R3,
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UNW_MIPS_R4,
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UNW_MIPS_R5,
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UNW_MIPS_R6,
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UNW_MIPS_R7,
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UNW_MIPS_R8,
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UNW_MIPS_R9,
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UNW_MIPS_R10,
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UNW_MIPS_R11,
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UNW_MIPS_R12,
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UNW_MIPS_R13,
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UNW_MIPS_R14,
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UNW_MIPS_R15,
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UNW_MIPS_R16,
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UNW_MIPS_R17,
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UNW_MIPS_R18,
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UNW_MIPS_R19,
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UNW_MIPS_R20,
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UNW_MIPS_R21,
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UNW_MIPS_R22,
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UNW_MIPS_R23,
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UNW_MIPS_R24,
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UNW_MIPS_R25,
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UNW_MIPS_R26,
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UNW_MIPS_R27,
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UNW_MIPS_R28,
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UNW_MIPS_R29,
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UNW_MIPS_R30,
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UNW_MIPS_R31,
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UNW_MIPS_PC = 34,
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/* FIXME: Other registers! */
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/* For MIPS, the CFA is the value of SP (r29) at the call site in the
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previous frame. */
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UNW_MIPS_CFA,
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UNW_TDEP_LAST_REG = UNW_MIPS_R31,
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UNW_TDEP_IP = UNW_MIPS_R31,
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UNW_TDEP_SP = UNW_MIPS_R29,
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UNW_TDEP_EH = UNW_MIPS_R0 /* FIXME. */
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}
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mips_regnum_t;
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typedef enum
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{
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UNW_MIPS_ABI_O32,
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UNW_MIPS_ABI_N32,
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UNW_MIPS_ABI_N64
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}
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mips_abi_t;
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#define UNW_TDEP_NUM_EH_REGS 2 /* FIXME for MIPS. */
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typedef struct unw_tdep_save_loc
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{
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/* Additional target-dependent info on a save location. */
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}
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unw_tdep_save_loc_t;
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/* On x86, we can directly use ucontext_t as the unwind context. FIXME for
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MIPS. */
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typedef ucontext_t unw_tdep_context_t;
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#include "libunwind-dynamic.h"
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typedef struct
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{
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/* no mips-specific auxiliary proc-info */
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}
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unw_tdep_proc_info_t;
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#include "libunwind-common.h"
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/* There is no getcontext() on MIPS. Use a stub version which only saves GP
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registers. FIXME: Not ideal, may not be sufficient for all libunwind
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use cases. */
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#define unw_tdep_getcontext UNW_ARCH_OBJ(getcontext)
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extern int unw_tdep_getcontext (ucontext_t *uc);
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#define unw_tdep_is_fpreg UNW_ARCH_OBJ(is_fpreg)
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extern int unw_tdep_is_fpreg (int);
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#if defined(__cplusplus) || defined(c_plusplus)
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}
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#endif
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#endif /* LIBUNWIND_H */
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