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c98cd1df22
A recent change only initializes the regs.how[] during Dwarf unwinding which resulted in an uninitialized offset used in return address signing and random failures during unwinding. The fix is to encode the return address signing state in REG_UNSAVED and a new state REG_UNSAVED_ARCHEXT. libgcc/ PR target/107678 * unwind-dw2.h (REG_UNSAVED_ARCHEXT): Add new enum. * unwind-dw2.c (uw_update_context_1): Add REG_UNSAVED_ARCHEXT case. * unwind-dw2-execute_cfa.h: Use REG_UNSAVED_ARCHEXT/REG_UNSAVED to encode the return address signing state. * config/aarch64/aarch64-unwind.h (aarch64_demangle_return_addr) Check current return address signing state. (aarch64_frob_update_contex): Remove.
85 lines
2.5 KiB
C
85 lines
2.5 KiB
C
/* DWARF2 frame unwind data structure.
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Copyright (C) 1997-2023 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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enum {
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REG_UNSAVED,
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REG_SAVED_OFFSET,
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REG_SAVED_REG,
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REG_SAVED_EXP,
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REG_SAVED_VAL_OFFSET,
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REG_SAVED_VAL_EXP,
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REG_UNSAVED_ARCHEXT, /* Target specific extension. */
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REG_UNDEFINED
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};
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/* The result of interpreting the frame unwind info for a frame.
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This is all symbolic at this point, as none of the values can
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be resolved until the target pc is located. */
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typedef struct
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{
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/* Each register save state can be described in terms of a CFA slot,
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another register, or a location expression. */
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struct frame_state_reg_info
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{
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struct {
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union {
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_Unwind_Word reg;
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_Unwind_Sword offset;
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const unsigned char *exp;
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} loc;
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} reg[__LIBGCC_DWARF_FRAME_REGISTERS__+1];
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unsigned char how[__LIBGCC_DWARF_FRAME_REGISTERS__+1];
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enum {
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CFA_UNSET,
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CFA_REG_OFFSET,
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CFA_EXP
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} cfa_how : 8;
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/* Used to implement DW_CFA_remember_state. */
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struct frame_state_reg_info *prev;
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/* The CFA can be described in terms of a reg+offset or a
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location expression. */
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_Unwind_Sword cfa_offset;
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_Unwind_Word cfa_reg;
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const unsigned char *cfa_exp;
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} regs;
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/* The PC described by the current frame state. */
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void *pc;
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/* The information we care about from the CIE/FDE. */
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_Unwind_Personality_Fn personality;
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_Unwind_Sword data_align;
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_Unwind_Word code_align;
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_Unwind_Word retaddr_column;
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unsigned char fde_encoding;
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unsigned char lsda_encoding;
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unsigned char saw_z;
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unsigned char signal_frame;
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void *eh_ptr;
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} _Unwind_FrameState;
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