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https://github.com/tobast/libunwind-eh_elf.git
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5f38f35d5d
Dropping the extra frame for unw_backtrace itself using unw_step is approximately 15% slower than skipping the frame in tdep_trace. So drop the frame in the latter, and make the function a private implementation detail for libunwind, not an exported interface. Also moves unw_getcontext call back into unw_backtrace to avoid an extra call frame in case slow_backtrace does not get inlined into unw_backtrace.
155 lines
4.1 KiB
C
155 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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/* 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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