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libgcc: Specialize execute_cfa_program in DWARF unwinder for alignments [redo]
The parameters fs->data_align and fs->code_align always have fixed values for a particular target in GCC-generated code. Specialize execute_cfa_program for these values, to avoid multiplications. gcc/c-family/ * c-cppbuiltin.cc (c_cpp_builtins): Define __LIBGCC_DWARF_CIE_DATA_ALIGNMENT__. libgcc/ * unwind-dw2-execute_cfa.h: New file. Extracted from the execute_cfa_program function in unwind-dw2.c. * unwind-dw2.c (execute_cfa_program_generic): New function. (execute_cfa_program_specialized): Likewise. (execute_cfa_program): Call execute_cfa_program_specialized or execute_cfa_program_generic, as appropriate.
This commit is contained in:
Florian Weimer
parent
455acc4351
commit
8fdef16cd5
@ -1521,6 +1521,9 @@ c_cpp_builtins (cpp_reader *pfile)
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#endif
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#endif
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builtin_define_with_int_value ("__LIBGCC_DWARF_FRAME_REGISTERS__",
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builtin_define_with_int_value ("__LIBGCC_DWARF_FRAME_REGISTERS__",
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DWARF_FRAME_REGISTERS);
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DWARF_FRAME_REGISTERS);
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builtin_define_with_int_value ("__LIBGCC_DWARF_CIE_DATA_ALIGNMENT__",
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DWARF_CIE_DATA_ALIGNMENT);
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#ifdef EH_RETURN_STACKADJ_RTX
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#ifdef EH_RETURN_STACKADJ_RTX
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cpp_define (pfile, "__LIBGCC_EH_RETURN_STACKADJ_RTX__");
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cpp_define (pfile, "__LIBGCC_EH_RETURN_STACKADJ_RTX__");
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#endif
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#endif
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322
libgcc/unwind-dw2-execute_cfa.h
Normal file
322
libgcc/unwind-dw2-execute_cfa.h
Normal file
@ -0,0 +1,322 @@
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/* DWARF2 exception handling CFA execution engine.
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Copyright (C) 1997-2022 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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/* This file is included from unwind-dw2.c to specialize the code for certain
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values of DATA_ALIGN and CODE_ALIGN. These macros must be defined prior to
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including this file. */
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{
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struct frame_state_reg_info *unused_rs = NULL;
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/* Don't allow remember/restore between CIE and FDE programs. */
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fs->regs.prev = NULL;
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/* The comparison with the return address uses < rather than <= because
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we are only interested in the effects of code before the call; for a
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noreturn function, the return address may point to unrelated code with
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a different stack configuration that we are not interested in. We
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assume that the call itself is unwind info-neutral; if not, or if
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there are delay instructions that adjust the stack, these must be
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reflected at the point immediately before the call insn.
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In signal frames, return address is after last completed instruction,
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so we add 1 to return address to make the comparison <=. */
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while (insn_ptr < insn_end
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&& fs->pc < context->ra + _Unwind_IsSignalFrame (context))
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{
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unsigned char insn = *insn_ptr++;
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_uleb128_t reg, utmp;
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_sleb128_t offset, stmp;
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if ((insn & 0xc0) == DW_CFA_advance_loc)
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fs->pc += (insn & 0x3f) * CODE_ALIGN;
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else if ((insn & 0xc0) == DW_CFA_offset)
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{
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reg = insn & 0x3f;
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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offset = (_Unwind_Sword) utmp * DATA_ALIGN;
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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{
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fs->regs.how[reg] = REG_SAVED_OFFSET;
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fs->regs.reg[reg].loc.offset = offset;
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}
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}
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else if ((insn & 0xc0) == DW_CFA_restore)
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{
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reg = insn & 0x3f;
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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fs->regs.how[reg] = REG_UNSAVED;
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}
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else switch (insn)
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{
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case DW_CFA_set_loc:
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{
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_Unwind_Ptr pc;
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insn_ptr = read_encoded_value (context, fs->fde_encoding,
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insn_ptr, &pc);
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fs->pc = (void *) pc;
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}
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break;
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case DW_CFA_advance_loc1:
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fs->pc += read_1u (insn_ptr) * CODE_ALIGN;
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insn_ptr += 1;
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break;
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case DW_CFA_advance_loc2:
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fs->pc += read_2u (insn_ptr) * CODE_ALIGN;
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insn_ptr += 2;
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break;
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case DW_CFA_advance_loc4:
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fs->pc += read_4u (insn_ptr) * CODE_ALIGN;
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insn_ptr += 4;
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break;
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case DW_CFA_offset_extended:
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insn_ptr = read_uleb128 (insn_ptr, ®);
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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offset = (_Unwind_Sword) utmp * DATA_ALIGN;
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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{
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fs->regs.how[reg] = REG_SAVED_OFFSET;
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fs->regs.reg[reg].loc.offset = offset;
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}
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break;
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case DW_CFA_restore_extended:
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insn_ptr = read_uleb128 (insn_ptr, ®);
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/* FIXME, this is wrong; the CIE might have said that the
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register was saved somewhere. */
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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fs->regs.how[reg] = REG_UNSAVED;
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break;
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case DW_CFA_same_value:
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insn_ptr = read_uleb128 (insn_ptr, ®);
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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fs->regs.how[reg] = REG_UNSAVED;
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break;
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case DW_CFA_undefined:
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insn_ptr = read_uleb128 (insn_ptr, ®);
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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fs->regs.how[reg] = REG_UNDEFINED;
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break;
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case DW_CFA_nop:
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break;
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case DW_CFA_register:
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{
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_uleb128_t reg2;
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insn_ptr = read_uleb128 (insn_ptr, ®);
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insn_ptr = read_uleb128 (insn_ptr, ®2);
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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{
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fs->regs.how[reg] = REG_SAVED_REG;
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fs->regs.reg[reg].loc.reg = (_Unwind_Word)reg2;
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}
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}
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break;
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case DW_CFA_remember_state:
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{
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struct frame_state_reg_info *new_rs;
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if (unused_rs)
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{
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new_rs = unused_rs;
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unused_rs = unused_rs->prev;
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}
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else
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new_rs = alloca (sizeof (struct frame_state_reg_info));
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*new_rs = fs->regs;
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fs->regs.prev = new_rs;
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}
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break;
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case DW_CFA_restore_state:
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{
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struct frame_state_reg_info *old_rs = fs->regs.prev;
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fs->regs = *old_rs;
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old_rs->prev = unused_rs;
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unused_rs = old_rs;
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}
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break;
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case DW_CFA_def_cfa:
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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fs->regs.cfa_reg = (_Unwind_Word)utmp;
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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fs->regs.cfa_offset = (_Unwind_Word)utmp;
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fs->regs.cfa_how = CFA_REG_OFFSET;
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break;
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case DW_CFA_def_cfa_register:
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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fs->regs.cfa_reg = (_Unwind_Word)utmp;
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fs->regs.cfa_how = CFA_REG_OFFSET;
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break;
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case DW_CFA_def_cfa_offset:
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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fs->regs.cfa_offset = utmp;
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/* cfa_how deliberately not set. */
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break;
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case DW_CFA_def_cfa_expression:
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fs->regs.cfa_exp = insn_ptr;
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fs->regs.cfa_how = CFA_EXP;
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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insn_ptr += utmp;
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break;
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case DW_CFA_expression:
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insn_ptr = read_uleb128 (insn_ptr, ®);
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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{
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fs->regs.how[reg] = REG_SAVED_EXP;
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fs->regs.reg[reg].loc.exp = insn_ptr;
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}
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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insn_ptr += utmp;
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break;
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/* Dwarf3. */
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case DW_CFA_offset_extended_sf:
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insn_ptr = read_uleb128 (insn_ptr, ®);
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insn_ptr = read_sleb128 (insn_ptr, &stmp);
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offset = stmp * DATA_ALIGN;
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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{
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fs->regs.how[reg] = REG_SAVED_OFFSET;
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fs->regs.reg[reg].loc.offset = offset;
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}
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break;
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case DW_CFA_def_cfa_sf:
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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fs->regs.cfa_reg = (_Unwind_Word)utmp;
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insn_ptr = read_sleb128 (insn_ptr, &stmp);
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fs->regs.cfa_offset = (_Unwind_Sword)stmp;
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fs->regs.cfa_how = CFA_REG_OFFSET;
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fs->regs.cfa_offset *= DATA_ALIGN;
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break;
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case DW_CFA_def_cfa_offset_sf:
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insn_ptr = read_sleb128 (insn_ptr, &stmp);
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fs->regs.cfa_offset = (_Unwind_Sword)stmp;
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fs->regs.cfa_offset *= DATA_ALIGN;
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/* cfa_how deliberately not set. */
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break;
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case DW_CFA_val_offset:
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insn_ptr = read_uleb128 (insn_ptr, ®);
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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offset = (_Unwind_Sword) utmp * DATA_ALIGN;
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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{
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fs->regs.how[reg] = REG_SAVED_VAL_OFFSET;
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fs->regs.reg[reg].loc.offset = offset;
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}
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break;
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case DW_CFA_val_offset_sf:
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insn_ptr = read_uleb128 (insn_ptr, ®);
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insn_ptr = read_sleb128 (insn_ptr, &stmp);
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offset = stmp * DATA_ALIGN;
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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{
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fs->regs.how[reg] = REG_SAVED_VAL_OFFSET;
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fs->regs.reg[reg].loc.offset = offset;
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}
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break;
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case DW_CFA_val_expression:
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insn_ptr = read_uleb128 (insn_ptr, ®);
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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{
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fs->regs.how[reg] = REG_SAVED_VAL_EXP;
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fs->regs.reg[reg].loc.exp = insn_ptr;
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}
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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insn_ptr += utmp;
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break;
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case DW_CFA_GNU_window_save:
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#if defined (__aarch64__) && !defined (__ILP32__)
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/* This CFA is multiplexed with Sparc. On AArch64 it's used to toggle
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return address signing status. */
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reg = DWARF_REGNUM_AARCH64_RA_STATE;
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gcc_assert (fs->regs.how[reg] == REG_UNSAVED);
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fs->regs.reg[reg].loc.offset ^= 1;
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#else
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/* ??? Hardcoded for SPARC register window configuration. */
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if (__LIBGCC_DWARF_FRAME_REGISTERS__ >= 32)
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for (reg = 16; reg < 32; ++reg)
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{
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fs->regs.how[reg] = REG_SAVED_OFFSET;
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fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *);
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}
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#endif
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break;
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case DW_CFA_GNU_args_size:
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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context->args_size = (_Unwind_Word)utmp;
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break;
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case DW_CFA_GNU_negative_offset_extended:
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/* Obsoleted by DW_CFA_offset_extended_sf, but used by
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older PowerPC code. */
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insn_ptr = read_uleb128 (insn_ptr, ®);
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insn_ptr = read_uleb128 (insn_ptr, &utmp);
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offset = (_Unwind_Word) utmp * DATA_ALIGN;
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reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
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if (UNWIND_COLUMN_IN_RANGE (reg))
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{
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fs->regs.how[reg] = REG_SAVED_OFFSET;
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fs->regs.reg[reg].loc.offset = -offset;
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}
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break;
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default:
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gcc_unreachable ();
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}
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}
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}
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#undef DATA_ALIGN
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#undef CODE_ALIGN
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@ -947,302 +947,43 @@ execute_stack_op (const unsigned char *op_ptr, const unsigned char *op_end,
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instruction sequence to decode, current register information and
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instruction sequence to decode, current register information and
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CIE info, and the PC range to evaluate. */
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CIE info, and the PC range to evaluate. */
|
||||||
|
|
||||||
|
static void __attribute__ ((__noinline__))
|
||||||
|
execute_cfa_program_generic (const unsigned char *insn_ptr,
|
||||||
|
const unsigned char *insn_end,
|
||||||
|
struct _Unwind_Context *context,
|
||||||
|
_Unwind_FrameState *fs)
|
||||||
|
{
|
||||||
|
#define DATA_ALIGN fs->data_align
|
||||||
|
#define CODE_ALIGN fs->code_align
|
||||||
|
#include "unwind-dw2-execute_cfa.h"
|
||||||
|
}
|
||||||
|
|
||||||
|
static inline void
|
||||||
|
execute_cfa_program_specialized (const unsigned char *insn_ptr,
|
||||||
|
const unsigned char *insn_end,
|
||||||
|
struct _Unwind_Context *context,
|
||||||
|
_Unwind_FrameState *fs)
|
||||||
|
{
|
||||||
|
#define DATA_ALIGN __LIBGCC_DWARF_CIE_DATA_ALIGNMENT__
|
||||||
|
/* GCC always uses 1 even on architectures with a fixed instruction
|
||||||
|
width. */
|
||||||
|
#define CODE_ALIGN 1
|
||||||
|
#include "unwind-dw2-execute_cfa.h"
|
||||||
|
}
|
||||||
|
|
||||||
static void
|
static void
|
||||||
execute_cfa_program (const unsigned char *insn_ptr,
|
execute_cfa_program (const unsigned char *insn_ptr,
|
||||||
const unsigned char *insn_end,
|
const unsigned char *insn_end,
|
||||||
struct _Unwind_Context *context,
|
struct _Unwind_Context *context,
|
||||||
_Unwind_FrameState *fs)
|
_Unwind_FrameState *fs)
|
||||||
{
|
{
|
||||||
struct frame_state_reg_info *unused_rs = NULL;
|
if (fs->data_align == __LIBGCC_DWARF_CIE_DATA_ALIGNMENT__
|
||||||
|
&& fs->code_align == 1)
|
||||||
/* Don't allow remember/restore between CIE and FDE programs. */
|
execute_cfa_program_specialized (insn_ptr, insn_end, context, fs);
|
||||||
fs->regs.prev = NULL;
|
else
|
||||||
|
execute_cfa_program_generic (insn_ptr, insn_end, context, fs);
|
||||||
/* The comparison with the return address uses < rather than <= because
|
|
||||||
we are only interested in the effects of code before the call; for a
|
|
||||||
noreturn function, the return address may point to unrelated code with
|
|
||||||
a different stack configuration that we are not interested in. We
|
|
||||||
assume that the call itself is unwind info-neutral; if not, or if
|
|
||||||
there are delay instructions that adjust the stack, these must be
|
|
||||||
reflected at the point immediately before the call insn.
|
|
||||||
In signal frames, return address is after last completed instruction,
|
|
||||||
so we add 1 to return address to make the comparison <=. */
|
|
||||||
while (insn_ptr < insn_end
|
|
||||||
&& fs->pc < context->ra + _Unwind_IsSignalFrame (context))
|
|
||||||
{
|
|
||||||
unsigned char insn = *insn_ptr++;
|
|
||||||
_uleb128_t reg, utmp;
|
|
||||||
_sleb128_t offset, stmp;
|
|
||||||
|
|
||||||
if ((insn & 0xc0) == DW_CFA_advance_loc)
|
|
||||||
fs->pc += (insn & 0x3f) * fs->code_align;
|
|
||||||
else if ((insn & 0xc0) == DW_CFA_offset)
|
|
||||||
{
|
|
||||||
reg = insn & 0x3f;
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
offset = (_Unwind_Sword) utmp * fs->data_align;
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
{
|
|
||||||
fs->regs.how[reg] = REG_SAVED_OFFSET;
|
|
||||||
fs->regs.reg[reg].loc.offset = offset;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
else if ((insn & 0xc0) == DW_CFA_restore)
|
|
||||||
{
|
|
||||||
reg = insn & 0x3f;
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
fs->regs.how[reg] = REG_UNSAVED;
|
|
||||||
}
|
|
||||||
else switch (insn)
|
|
||||||
{
|
|
||||||
case DW_CFA_set_loc:
|
|
||||||
{
|
|
||||||
_Unwind_Ptr pc;
|
|
||||||
|
|
||||||
insn_ptr = read_encoded_value (context, fs->fde_encoding,
|
|
||||||
insn_ptr, &pc);
|
|
||||||
fs->pc = (void *) pc;
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_advance_loc1:
|
|
||||||
fs->pc += read_1u (insn_ptr) * fs->code_align;
|
|
||||||
insn_ptr += 1;
|
|
||||||
break;
|
|
||||||
case DW_CFA_advance_loc2:
|
|
||||||
fs->pc += read_2u (insn_ptr) * fs->code_align;
|
|
||||||
insn_ptr += 2;
|
|
||||||
break;
|
|
||||||
case DW_CFA_advance_loc4:
|
|
||||||
fs->pc += read_4u (insn_ptr) * fs->code_align;
|
|
||||||
insn_ptr += 4;
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_offset_extended:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
offset = (_Unwind_Sword) utmp * fs->data_align;
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
{
|
|
||||||
fs->regs.how[reg] = REG_SAVED_OFFSET;
|
|
||||||
fs->regs.reg[reg].loc.offset = offset;
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_restore_extended:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
/* FIXME, this is wrong; the CIE might have said that the
|
|
||||||
register was saved somewhere. */
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
fs->regs.how[reg] = REG_UNSAVED;
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_same_value:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
fs->regs.how[reg] = REG_UNSAVED;
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_undefined:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
fs->regs.how[reg] = REG_UNDEFINED;
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_nop:
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_register:
|
|
||||||
{
|
|
||||||
_uleb128_t reg2;
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®2);
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
{
|
|
||||||
fs->regs.how[reg] = REG_SAVED_REG;
|
|
||||||
fs->regs.reg[reg].loc.reg = (_Unwind_Word)reg2;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_remember_state:
|
|
||||||
{
|
|
||||||
struct frame_state_reg_info *new_rs;
|
|
||||||
if (unused_rs)
|
|
||||||
{
|
|
||||||
new_rs = unused_rs;
|
|
||||||
unused_rs = unused_rs->prev;
|
|
||||||
}
|
|
||||||
else
|
|
||||||
new_rs = alloca (sizeof (struct frame_state_reg_info));
|
|
||||||
|
|
||||||
*new_rs = fs->regs;
|
|
||||||
fs->regs.prev = new_rs;
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_restore_state:
|
|
||||||
{
|
|
||||||
struct frame_state_reg_info *old_rs = fs->regs.prev;
|
|
||||||
fs->regs = *old_rs;
|
|
||||||
old_rs->prev = unused_rs;
|
|
||||||
unused_rs = old_rs;
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_def_cfa:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
fs->regs.cfa_reg = (_Unwind_Word)utmp;
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
fs->regs.cfa_offset = (_Unwind_Word)utmp;
|
|
||||||
fs->regs.cfa_how = CFA_REG_OFFSET;
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_def_cfa_register:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
fs->regs.cfa_reg = (_Unwind_Word)utmp;
|
|
||||||
fs->regs.cfa_how = CFA_REG_OFFSET;
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_def_cfa_offset:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
fs->regs.cfa_offset = utmp;
|
|
||||||
/* cfa_how deliberately not set. */
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_def_cfa_expression:
|
|
||||||
fs->regs.cfa_exp = insn_ptr;
|
|
||||||
fs->regs.cfa_how = CFA_EXP;
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
insn_ptr += utmp;
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_expression:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
{
|
|
||||||
fs->regs.how[reg] = REG_SAVED_EXP;
|
|
||||||
fs->regs.reg[reg].loc.exp = insn_ptr;
|
|
||||||
}
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
insn_ptr += utmp;
|
|
||||||
break;
|
|
||||||
|
|
||||||
/* Dwarf3. */
|
|
||||||
case DW_CFA_offset_extended_sf:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
insn_ptr = read_sleb128 (insn_ptr, &stmp);
|
|
||||||
offset = stmp * fs->data_align;
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
{
|
|
||||||
fs->regs.how[reg] = REG_SAVED_OFFSET;
|
|
||||||
fs->regs.reg[reg].loc.offset = offset;
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_def_cfa_sf:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
fs->regs.cfa_reg = (_Unwind_Word)utmp;
|
|
||||||
insn_ptr = read_sleb128 (insn_ptr, &stmp);
|
|
||||||
fs->regs.cfa_offset = (_Unwind_Sword)stmp;
|
|
||||||
fs->regs.cfa_how = CFA_REG_OFFSET;
|
|
||||||
fs->regs.cfa_offset *= fs->data_align;
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_def_cfa_offset_sf:
|
|
||||||
insn_ptr = read_sleb128 (insn_ptr, &stmp);
|
|
||||||
fs->regs.cfa_offset = (_Unwind_Sword)stmp;
|
|
||||||
fs->regs.cfa_offset *= fs->data_align;
|
|
||||||
/* cfa_how deliberately not set. */
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_val_offset:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
offset = (_Unwind_Sword) utmp * fs->data_align;
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
{
|
|
||||||
fs->regs.how[reg] = REG_SAVED_VAL_OFFSET;
|
|
||||||
fs->regs.reg[reg].loc.offset = offset;
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_val_offset_sf:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
insn_ptr = read_sleb128 (insn_ptr, &stmp);
|
|
||||||
offset = stmp * fs->data_align;
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
{
|
|
||||||
fs->regs.how[reg] = REG_SAVED_VAL_OFFSET;
|
|
||||||
fs->regs.reg[reg].loc.offset = offset;
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_val_expression:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
{
|
|
||||||
fs->regs.how[reg] = REG_SAVED_VAL_EXP;
|
|
||||||
fs->regs.reg[reg].loc.exp = insn_ptr;
|
|
||||||
}
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
insn_ptr += utmp;
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_GNU_window_save:
|
|
||||||
#if defined (__aarch64__) && !defined (__ILP32__)
|
|
||||||
/* This CFA is multiplexed with Sparc. On AArch64 it's used to toggle
|
|
||||||
return address signing status. */
|
|
||||||
reg = DWARF_REGNUM_AARCH64_RA_STATE;
|
|
||||||
gcc_assert (fs->regs.how[reg] == REG_UNSAVED);
|
|
||||||
fs->regs.reg[reg].loc.offset ^= 1;
|
|
||||||
#else
|
|
||||||
/* ??? Hardcoded for SPARC register window configuration. */
|
|
||||||
if (__LIBGCC_DWARF_FRAME_REGISTERS__ >= 32)
|
|
||||||
for (reg = 16; reg < 32; ++reg)
|
|
||||||
{
|
|
||||||
fs->regs.how[reg] = REG_SAVED_OFFSET;
|
|
||||||
fs->regs.reg[reg].loc.offset = (reg - 16) * sizeof (void *);
|
|
||||||
}
|
|
||||||
#endif
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_GNU_args_size:
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
context->args_size = (_Unwind_Word)utmp;
|
|
||||||
break;
|
|
||||||
|
|
||||||
case DW_CFA_GNU_negative_offset_extended:
|
|
||||||
/* Obsoleted by DW_CFA_offset_extended_sf, but used by
|
|
||||||
older PowerPC code. */
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, ®);
|
|
||||||
insn_ptr = read_uleb128 (insn_ptr, &utmp);
|
|
||||||
offset = (_Unwind_Word) utmp * fs->data_align;
|
|
||||||
reg = DWARF_REG_TO_UNWIND_COLUMN (reg);
|
|
||||||
if (UNWIND_COLUMN_IN_RANGE (reg))
|
|
||||||
{
|
|
||||||
fs->regs.how[reg] = REG_SAVED_OFFSET;
|
|
||||||
fs->regs.reg[reg].loc.offset = -offset;
|
|
||||||
}
|
|
||||||
break;
|
|
||||||
|
|
||||||
default:
|
|
||||||
gcc_unreachable ();
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
||||||
/* Given the _Unwind_Context CONTEXT for a stack frame, look up the FDE for
|
/* Given the _Unwind_Context CONTEXT for a stack frame, look up the FDE for
|
||||||
its caller and decode it into FS. This function also sets the
|
its caller and decode it into FS. This function also sets the
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user