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comparison libgcc/unwind-dw2.c @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
parents 04ced10e8804
children 1830386684a0
comparison
equal deleted inserted replaced
111:04ced10e8804 131:84e7813d76e9
1 /* DWARF2 exception handling and frame unwind runtime interface routines. 1 /* DWARF2 exception handling and frame unwind runtime interface routines.
2 Copyright (C) 1997-2017 Free Software Foundation, Inc. 2 Copyright (C) 1997-2018 Free Software Foundation, Inc.
3 3
4 This file is part of GCC. 4 This file is part of GCC.
5 5
6 GCC is free software; you can redistribute it and/or modify it 6 GCC is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by 7 under the terms of the GNU General Public License as published by
214 { 214 {
215 return (ASSUME_EXTENDED_UNWIND_CONTEXT 215 return (ASSUME_EXTENDED_UNWIND_CONTEXT
216 || (context->flags & EXTENDED_CONTEXT_BIT)); 216 || (context->flags & EXTENDED_CONTEXT_BIT));
217 } 217 }
218 218
219 /* Get the value of register INDEX as saved in CONTEXT. */ 219 /* Get the value of register REGNO as saved in CONTEXT. */
220 220
221 inline _Unwind_Word 221 inline _Unwind_Word
222 _Unwind_GetGR (struct _Unwind_Context *context, int index) 222 _Unwind_GetGR (struct _Unwind_Context *context, int regno)
223 { 223 {
224 int size; 224 int size, index;
225 _Unwind_Context_Reg_Val val; 225 _Unwind_Context_Reg_Val val;
226 226
227 #ifdef DWARF_ZERO_REG 227 #ifdef DWARF_ZERO_REG
228 if (index == DWARF_ZERO_REG) 228 if (index == DWARF_ZERO_REG)
229 return 0; 229 return 0;
230 #endif 230 #endif
231 231
232 index = DWARF_REG_TO_UNWIND_COLUMN (index); 232 index = DWARF_REG_TO_UNWIND_COLUMN (regno);
233 gcc_assert (index < (int) sizeof(dwarf_reg_size_table)); 233 gcc_assert (index < (int) sizeof(dwarf_reg_size_table));
234 size = dwarf_reg_size_table[index]; 234 size = dwarf_reg_size_table[index];
235 val = context->reg[index]; 235 val = context->reg[index];
236 236
237 if (_Unwind_IsExtendedContext (context) && context->by_value[index]) 237 if (_Unwind_IsExtendedContext (context) && context->by_value[index])
238 return _Unwind_Get_Unwind_Word (val); 238 return _Unwind_Get_Unwind_Word (val);
239
240 #ifdef DWARF_LAZY_REGISTER_VALUE
241 {
242 _Unwind_Word value;
243 if (DWARF_LAZY_REGISTER_VALUE (regno, &value))
244 return value;
245 }
246 #endif
239 247
240 /* This will segfault if the register hasn't been saved. */ 248 /* This will segfault if the register hasn't been saved. */
241 if (size == sizeof(_Unwind_Ptr)) 249 if (size == sizeof(_Unwind_Ptr))
242 return * (_Unwind_Ptr *) (_Unwind_Internal_Ptr) val; 250 return * (_Unwind_Ptr *) (_Unwind_Internal_Ptr) val;
243 else 251 else
1642 return ret_addr; 1650 return ret_addr;
1643 } 1651 }
1644 1652
1645 /* Install TARGET into CURRENT so that we can return to it. This is a 1653 /* Install TARGET into CURRENT so that we can return to it. This is a
1646 macro because __builtin_eh_return must be invoked in the context of 1654 macro because __builtin_eh_return must be invoked in the context of
1647 our caller. */ 1655 our caller. FRAMES is a number of frames to be unwind.
1648 1656 _Unwind_Frames_Extra is a macro to do additional work during unwinding
1649 #define uw_install_context(CURRENT, TARGET) \ 1657 if needed, for example shadow stack pointer adjustment for Intel CET
1658 technology. */
1659
1660 #define uw_install_context(CURRENT, TARGET, FRAMES) \
1650 do \ 1661 do \
1651 { \ 1662 { \
1652 long offset = uw_install_context_1 ((CURRENT), (TARGET)); \ 1663 long offset = uw_install_context_1 ((CURRENT), (TARGET)); \
1653 void *handler = uw_frob_return_addr ((CURRENT), (TARGET)); \ 1664 void *handler = uw_frob_return_addr ((CURRENT), (TARGET)); \
1654 _Unwind_DebugHook ((TARGET)->cfa, handler); \ 1665 _Unwind_DebugHook ((TARGET)->cfa, handler); \
1666 _Unwind_Frames_Extra (FRAMES); \
1655 __builtin_eh_return (offset, handler); \ 1667 __builtin_eh_return (offset, handler); \
1656 } \ 1668 } \
1657 while (0) 1669 while (0)
1658 1670
1659 static long 1671 static long