mirror of
https://github.com/tobast/libunwind-eh_elf.git
synced 2024-12-23 03:53:43 +01:00
1a4b357598
The ARM Thumb implementation of unw_tdep_getcontext switches to ARM
mode (".code 32"), but doesn't switch back to Thumb mode.
In gcc, this is fine (it automatically switches back to Thumb mode
at the end of an asm block), but in clang, this causes bad assembly
output (thumb instructions generated by C/C++ code later on are
interpreted as ARM mode assembly, which can't work).
Switching back to Thumb mode manually fixes clang, and is a no-op for gcc.
303 lines
7.5 KiB
C
303 lines
7.5 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 <stddef.h>
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#define UNW_TARGET arm
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#define UNW_TARGET_ARM 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 ARM. Too big? What do other things use for similar tasks? */
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#define UNW_TDEP_CURSOR_LEN 4096
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typedef uint32_t unw_word_t;
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typedef int32_t unw_sword_t;
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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_ARM_R0,
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UNW_ARM_R1,
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UNW_ARM_R2,
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UNW_ARM_R3,
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UNW_ARM_R4,
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UNW_ARM_R5,
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UNW_ARM_R6,
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UNW_ARM_R7,
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UNW_ARM_R8,
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UNW_ARM_R9,
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UNW_ARM_R10,
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UNW_ARM_R11,
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UNW_ARM_R12,
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UNW_ARM_R13,
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UNW_ARM_R14,
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UNW_ARM_R15,
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/* VFPv2 s0-s31 (obsolescent numberings). */
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UNW_ARM_S0 = 64,
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UNW_ARM_S1,
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UNW_ARM_S2,
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UNW_ARM_S3,
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UNW_ARM_S4,
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UNW_ARM_S5,
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UNW_ARM_S6,
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UNW_ARM_S7,
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UNW_ARM_S8,
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UNW_ARM_S9,
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UNW_ARM_S10,
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UNW_ARM_S11,
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UNW_ARM_S12,
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UNW_ARM_S13,
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UNW_ARM_S14,
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UNW_ARM_S15,
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UNW_ARM_S16,
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UNW_ARM_S17,
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UNW_ARM_S18,
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UNW_ARM_S19,
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UNW_ARM_S20,
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UNW_ARM_S21,
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UNW_ARM_S22,
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UNW_ARM_S23,
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UNW_ARM_S24,
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UNW_ARM_S25,
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UNW_ARM_S26,
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UNW_ARM_S27,
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UNW_ARM_S28,
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UNW_ARM_S29,
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UNW_ARM_S30,
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UNW_ARM_S31,
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/* FPA register numberings. */
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UNW_ARM_F0 = 96,
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UNW_ARM_F1,
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UNW_ARM_F2,
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UNW_ARM_F3,
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UNW_ARM_F4,
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UNW_ARM_F5,
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UNW_ARM_F6,
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UNW_ARM_F7,
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/* iWMMXt GR register numberings. */
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UNW_ARM_wCGR0 = 104,
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UNW_ARM_wCGR1,
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UNW_ARM_wCGR2,
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UNW_ARM_wCGR3,
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UNW_ARM_wCGR4,
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UNW_ARM_wCGR5,
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UNW_ARM_wCGR6,
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UNW_ARM_wCGR7,
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/* iWMMXt register numberings. */
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UNW_ARM_wR0 = 112,
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UNW_ARM_wR1,
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UNW_ARM_wR2,
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UNW_ARM_wR3,
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UNW_ARM_wR4,
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UNW_ARM_wR5,
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UNW_ARM_wR6,
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UNW_ARM_wR7,
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UNW_ARM_wR8,
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UNW_ARM_wR9,
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UNW_ARM_wR10,
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UNW_ARM_wR11,
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UNW_ARM_wR12,
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UNW_ARM_wR13,
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UNW_ARM_wR14,
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UNW_ARM_wR15,
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/* Two-byte encodings from here on. */
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/* SPSR. */
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UNW_ARM_SPSR = 128,
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UNW_ARM_SPSR_FIQ,
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UNW_ARM_SPSR_IRQ,
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UNW_ARM_SPSR_ABT,
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UNW_ARM_SPSR_UND,
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UNW_ARM_SPSR_SVC,
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/* User mode registers. */
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UNW_ARM_R8_USR = 144,
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UNW_ARM_R9_USR,
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UNW_ARM_R10_USR,
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UNW_ARM_R11_USR,
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UNW_ARM_R12_USR,
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UNW_ARM_R13_USR,
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UNW_ARM_R14_USR,
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/* FIQ registers. */
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UNW_ARM_R8_FIQ = 151,
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UNW_ARM_R9_FIQ,
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UNW_ARM_R10_FIQ,
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UNW_ARM_R11_FIQ,
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UNW_ARM_R12_FIQ,
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UNW_ARM_R13_FIQ,
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UNW_ARM_R14_FIQ,
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/* IRQ registers. */
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UNW_ARM_R13_IRQ = 158,
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UNW_ARM_R14_IRQ,
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/* ABT registers. */
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UNW_ARM_R13_ABT = 160,
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UNW_ARM_R14_ABT,
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/* UND registers. */
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UNW_ARM_R13_UND = 162,
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UNW_ARM_R14_UND,
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/* SVC registers. */
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UNW_ARM_R13_SVC = 164,
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UNW_ARM_R14_SVC,
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/* iWMMXt control registers. */
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UNW_ARM_wC0 = 192,
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UNW_ARM_wC1,
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UNW_ARM_wC2,
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UNW_ARM_wC3,
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UNW_ARM_wC4,
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UNW_ARM_wC5,
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UNW_ARM_wC6,
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UNW_ARM_wC7,
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/* VFPv3/Neon 64-bit registers. */
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UNW_ARM_D0 = 256,
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UNW_ARM_D1,
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UNW_ARM_D2,
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UNW_ARM_D3,
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UNW_ARM_D4,
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UNW_ARM_D5,
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UNW_ARM_D6,
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UNW_ARM_D7,
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UNW_ARM_D8,
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UNW_ARM_D9,
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UNW_ARM_D10,
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UNW_ARM_D11,
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UNW_ARM_D12,
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UNW_ARM_D13,
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UNW_ARM_D14,
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UNW_ARM_D15,
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UNW_ARM_D16,
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UNW_ARM_D17,
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UNW_ARM_D18,
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UNW_ARM_D19,
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UNW_ARM_D20,
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UNW_ARM_D21,
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UNW_ARM_D22,
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UNW_ARM_D23,
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UNW_ARM_D24,
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UNW_ARM_D25,
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UNW_ARM_D26,
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UNW_ARM_D27,
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UNW_ARM_D28,
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UNW_ARM_D29,
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UNW_ARM_D30,
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UNW_ARM_D31,
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/* For ARM, the CFA is the value of SP (r13) at the call site in the
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previous frame. */
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UNW_ARM_CFA,
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UNW_TDEP_LAST_REG = UNW_ARM_D31,
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UNW_TDEP_IP = UNW_ARM_R14, /* A little white lie. */
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UNW_TDEP_SP = UNW_ARM_R13,
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UNW_TDEP_EH = UNW_ARM_R0 /* FIXME. */
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}
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arm_regnum_t;
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#define UNW_TDEP_NUM_EH_REGS 2 /* FIXME for ARM. */
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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 ARM, we define our own unw_tdep_context instead of using ucontext_t.
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This allows us to support systems that don't support getcontext and
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therefore do not define ucontext_t. */
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typedef struct unw_tdep_context
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{
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unsigned long regs[16];
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}
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unw_tdep_context_t;
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/* There is no getcontext() on ARM. 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. Stores pc+8, which is only approximately correct, really. */
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#ifndef __thumb__
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#define unw_tdep_getcontext(uc) (({ \
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unw_tdep_context_t *unw_ctx = (uc); \
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register unsigned long *unw_base __asm__ ("r0") = unw_ctx->regs; \
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__asm__ __volatile__ ( \
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"stmia %[base], {r0-r15}" \
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: : [base] "r" (unw_base) : "memory"); \
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}), 0)
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#else /* __thumb__ */
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#define unw_tdep_getcontext(uc) (({ \
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unw_tdep_context_t *unw_ctx = (uc); \
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register unsigned long *unw_base __asm__ ("r0") = unw_ctx->regs; \
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__asm__ __volatile__ ( \
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".align 2\nbx pc\nnop\n.code 32\n" \
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"stmia %[base], {r0-r15}\n" \
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"orr %[base], pc, #1\nbx %[base]\n" \
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".code 16\n" \
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: [base] "+r" (unw_base) : : "memory", "cc"); \
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}), 0)
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#endif
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#include "libunwind-dynamic.h"
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typedef struct
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{
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/* no arm-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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