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91 lines
2.9 KiB
91 lines
2.9 KiB
/* arm ABI-specified defaults for DWARF CFI.
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Copyright (C) 2013 Red Hat, Inc.
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This file is part of elfutils.
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This file is free software; you can redistribute it and/or modify
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it under the terms of either
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at
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your option) any later version
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at
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your option) any later version
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or both in parallel, as here.
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elfutils is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <dwarf.h>
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#define BACKEND arm_
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#include "libebl_CPU.h"
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/* ABI-specified state of DWARF CFI based on:
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"DWARF for the ARM Architecture ABI r2.09"
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http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040b/IHI0040B_aadwarf.pdf
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"Procedure Call Standard for the ARM Architecture ABI r2.09"
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http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042e/IHI0042E_aapcs.pdf
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*/
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int
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arm_abi_cfi (Ebl *ebl __attribute__ ((unused)), Dwarf_CIE *abi_info)
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{
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static const uint8_t abi_cfi[] =
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{
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/* The initial Canonical Frame Address is the value of the
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Stack Pointer (r13) as setup in the previous frame. */
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DW_CFA_def_cfa, ULEB128_7 (13), ULEB128_7 (0),
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/* The Stack Pointer (r13) is restored from CFA address by default. */
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DW_CFA_val_offset, ULEB128_7 (13), ULEB128_7 (0),
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#define SV(n) DW_CFA_same_value, ULEB128_7 (n)
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/* Callee-saved regs r4-r8, r10, r11. */
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SV (4), SV (5), SV (6), SV (7), SV (8), SV (10), SV (11),
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/* The link register contains the return address setup by caller. */
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SV (14),
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DW_CFA_register, ULEB128_7 (15), ULEB128_7 (14), /* pc = lr */
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#undef SV
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/* VFP S16-S31/D8-D15/Q4-Q7 are callee saved.
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And uleb128 encoded with two bytes. */
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#define ULEB128_8_2(x) ((x & 0x7f) | 0x80), 0x02
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#define SV(n) DW_CFA_same_value, ULEB128_8_2 (n)
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SV (264), SV (265), SV (266), SV (267),
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SV (268), SV (269), SV (270), SV (271),
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/* XXX Note: registers intentionally unused by the program,
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for example as a consequence of the procedure call standard
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should be initialized as if by DW_CFA_same_value. */
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};
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#undef ULEB128_8_2
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#undef SV
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abi_info->initial_instructions = abi_cfi;
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abi_info->initial_instructions_end = &abi_cfi[sizeof abi_cfi];
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abi_info->data_alignment_factor = 4;
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abi_info->return_address_register = 15; /* pc. */
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return 0;
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}
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