mirror of
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.
264 lines
6.7 KiB
C
264 lines
6.7 KiB
C
/* libunwind - a platform-independent unwind library
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Copyright (C) 2006-2007 IBM
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Contributed by
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Corey Ashford <cjashfor@us.ibm.com>
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Jose Flavio Aguilar Paulino <jflavio@br.ibm.com> <joseflavio@gmail.com>
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Copied from libunwind-x86_64.h, modified slightly for building
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frysk successfully on ppc64, by Wu Zhou <woodzltc@cn.ibm.com>
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Will be replaced when libunwind is ready on ppc64 platform.
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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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#define UNW_TARGET ppc64
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#define UNW_TARGET_PPC64 1
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#define _U_TDEP_QP_TRUE 0 /* see libunwind-dynamic.h */
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/*
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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 want
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* to err on making it rather too big than too small.
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*
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* To simplify this whole process, we are at least initially taking the
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* tack that UNW_PPC64_* map straight across to the .eh_frame column register
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* numbers. These register numbers come from gcc's source in
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* gcc/config/rs6000/rs6000.h
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*
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* UNW_TDEP_CURSOR_LEN is in terms of unw_word_t size. Since we have 115
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* elements in the loc array, each sized 2 * unw_word_t, plus the rest of
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* the cursor struct, this puts us at about 2 * 115 + 40 = 270. Let's
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* round that up to 280.
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*/
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#define UNW_TDEP_CURSOR_LEN 280
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#if __WORDSIZE==32
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typedef uint32_t unw_word_t;
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typedef int32_t unw_sword_t;
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#else
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typedef uint64_t unw_word_t;
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typedef int64_t unw_sword_t;
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#endif
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typedef long double unw_tdep_fpreg_t;
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/*
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* Vector register (in PowerPC64 used for AltiVec registers)
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*/
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typedef struct {
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uint64_t halves[2];
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} unw_tdep_vreg_t;
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typedef enum
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{
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UNW_PPC64_R0,
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UNW_PPC64_R1, /* called STACK_POINTER in gcc */
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UNW_PPC64_R2,
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UNW_PPC64_R3,
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UNW_PPC64_R4,
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UNW_PPC64_R5,
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UNW_PPC64_R6,
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UNW_PPC64_R7,
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UNW_PPC64_R8,
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UNW_PPC64_R9,
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UNW_PPC64_R10,
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UNW_PPC64_R11, /* called STATIC_CHAIN in gcc */
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UNW_PPC64_R12,
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UNW_PPC64_R13,
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UNW_PPC64_R14,
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UNW_PPC64_R15,
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UNW_PPC64_R16,
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UNW_PPC64_R17,
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UNW_PPC64_R18,
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UNW_PPC64_R19,
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UNW_PPC64_R20,
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UNW_PPC64_R21,
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UNW_PPC64_R22,
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UNW_PPC64_R23,
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UNW_PPC64_R24,
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UNW_PPC64_R25,
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UNW_PPC64_R26,
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UNW_PPC64_R27,
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UNW_PPC64_R28,
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UNW_PPC64_R29,
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UNW_PPC64_R30,
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UNW_PPC64_R31, /* called HARD_FRAME_POINTER in gcc */
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UNW_PPC64_F0 = 32,
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UNW_PPC64_F1,
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UNW_PPC64_F2,
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UNW_PPC64_F3,
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UNW_PPC64_F4,
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UNW_PPC64_F5,
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UNW_PPC64_F6,
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UNW_PPC64_F7,
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UNW_PPC64_F8,
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UNW_PPC64_F9,
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UNW_PPC64_F10,
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UNW_PPC64_F11,
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UNW_PPC64_F12,
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UNW_PPC64_F13,
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UNW_PPC64_F14,
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UNW_PPC64_F15,
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UNW_PPC64_F16,
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UNW_PPC64_F17,
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UNW_PPC64_F18,
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UNW_PPC64_F19,
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UNW_PPC64_F20,
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UNW_PPC64_F21,
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UNW_PPC64_F22,
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UNW_PPC64_F23,
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UNW_PPC64_F24,
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UNW_PPC64_F25,
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UNW_PPC64_F26,
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UNW_PPC64_F27,
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UNW_PPC64_F28,
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UNW_PPC64_F29,
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UNW_PPC64_F30,
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UNW_PPC64_F31,
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/* Note that there doesn't appear to be an .eh_frame register column
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for the FPSCR register. I don't know why this is. Since .eh_frame
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info is what this implementation uses for unwinding, we have no way
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to unwind this register, and so we will not expose an FPSCR register
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number in the libunwind API.
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*/
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UNW_PPC64_LR = 65,
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UNW_PPC64_CTR = 66,
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UNW_PPC64_ARG_POINTER = 67,
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UNW_PPC64_CR0 = 68,
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UNW_PPC64_CR1,
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UNW_PPC64_CR2,
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UNW_PPC64_CR3,
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UNW_PPC64_CR4,
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/* CR5 .. CR7 are currently unused */
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UNW_PPC64_CR5,
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UNW_PPC64_CR6,
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UNW_PPC64_CR7,
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UNW_PPC64_XER = 76,
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UNW_PPC64_V0 = 77,
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UNW_PPC64_V1,
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UNW_PPC64_V2,
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UNW_PPC64_V3,
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UNW_PPC64_V4,
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UNW_PPC64_V5,
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UNW_PPC64_V6,
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UNW_PPC64_V7,
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UNW_PPC64_V8,
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UNW_PPC64_V9,
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UNW_PPC64_V10,
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UNW_PPC64_V11,
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UNW_PPC64_V12,
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UNW_PPC64_V13,
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UNW_PPC64_V14,
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UNW_PPC64_V15,
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UNW_PPC64_V16,
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UNW_PPC64_V17,
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UNW_PPC64_V18,
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UNW_PPC64_V19,
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UNW_PPC64_V20,
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UNW_PPC64_V21,
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UNW_PPC64_V22,
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UNW_PPC64_V23,
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UNW_PPC64_V24,
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UNW_PPC64_V25,
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UNW_PPC64_V26,
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UNW_PPC64_V27,
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UNW_PPC64_V28,
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UNW_PPC64_V29,
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UNW_PPC64_V30,
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UNW_PPC64_V31,
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UNW_PPC64_VRSAVE = 109,
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UNW_PPC64_VSCR = 110,
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UNW_PPC64_SPE_ACC = 111,
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UNW_PPC64_SPEFSCR = 112,
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/* frame info (read-only) */
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UNW_PPC64_FRAME_POINTER,
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UNW_PPC64_NIP,
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UNW_TDEP_LAST_REG = UNW_PPC64_NIP,
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UNW_TDEP_IP = UNW_PPC64_NIP,
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UNW_TDEP_SP = UNW_PPC64_R1,
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UNW_TDEP_EH = UNW_PPC64_R12
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}
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ppc64_regnum_t;
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/*
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* According to David Edelsohn, GNU gcc uses R3, R4, R5, and maybe R6 for
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* passing parameters to exception handlers.
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*/
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#define UNW_TDEP_NUM_EH_REGS 4
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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 ppc64, we can directly use ucontext_t as the unwind context. */
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typedef ucontext_t unw_tdep_context_t;
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/* XXX this is not ideal: an application should not be prevented from
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using the "getcontext" name just because it's using libunwind. We
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can't just use __getcontext() either, because that isn't exported
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by glibc... */
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#define unw_tdep_getcontext(uc) (getcontext (uc), 0)
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#include "libunwind-dynamic.h"
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typedef struct
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{
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/* no ppc64-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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#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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