133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/* asm-common-aarch64.h - Common macros for AArch64 assembly
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*
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* Copyright (C) 2018 Martin Storsjö <martin@martin.st>
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GCRY_ASM_COMMON_AARCH64_H
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#define GCRY_ASM_COMMON_AARCH64_H
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#include <config.h>
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#ifdef HAVE_GCC_ASM_ELF_DIRECTIVES
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# define ELF(...) __VA_ARGS__
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#else
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# define ELF(...) /*_*/
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#endif
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#ifdef _WIN32
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# define SECTION_RODATA .section .rdata
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#else
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# define SECTION_RODATA .section .rodata
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#endif
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#ifdef __APPLE__
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#define GET_DATA_POINTER(reg, name) \
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adrp reg, name@GOTPAGE ; \
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add reg, reg, name@GOTPAGEOFF ;
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#else
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#define GET_DATA_POINTER(reg, name) \
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adrp reg, name ; \
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add reg, reg, #:lo12:name ;
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#endif
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#ifdef HAVE_GCC_ASM_CFI_DIRECTIVES
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/* CFI directives to emit DWARF stack unwinding information. */
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# define CFI_STARTPROC() .cfi_startproc
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# define CFI_ENDPROC() .cfi_endproc
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# define CFI_REMEMBER_STATE() .cfi_remember_state
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# define CFI_RESTORE_STATE() .cfi_restore_state
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# define CFI_ADJUST_CFA_OFFSET(off) .cfi_adjust_cfa_offset off
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# define CFI_REL_OFFSET(reg,off) .cfi_rel_offset reg, off
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# define CFI_DEF_CFA_REGISTER(reg) .cfi_def_cfa_register reg
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# define CFI_REGISTER(ro,rn) .cfi_register ro, rn
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# define CFI_RESTORE(reg) .cfi_restore reg
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/* CFA expressions are used for pointing CFA and registers to
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* SP relative offsets. */
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# define DW_REGNO_SP 31
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/* Fixed length encoding used for integers for now. */
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# define DW_SLEB128_7BIT(value) \
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0x00|((value) & 0x7f)
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# define DW_SLEB128_28BIT(value) \
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0x80|((value)&0x7f), \
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0x80|(((value)>>7)&0x7f), \
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0x80|(((value)>>14)&0x7f), \
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0x00|(((value)>>21)&0x7f)
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# define CFI_CFA_ON_STACK(rsp_offs,cfa_depth) \
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.cfi_escape \
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0x0f, /* DW_CFA_def_cfa_expression */ \
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DW_SLEB128_7BIT(11), /* length */ \
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0x8f, /* DW_OP_breg31, rsp + constant */ \
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DW_SLEB128_28BIT(rsp_offs), \
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0x06, /* DW_OP_deref */ \
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0x23, /* DW_OP_plus_constu */ \
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DW_SLEB128_28BIT((cfa_depth)+8)
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# define CFI_REG_ON_STACK(regno,rsp_offs) \
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.cfi_escape \
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0x10, /* DW_CFA_expression */ \
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DW_SLEB128_7BIT(regno), \
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DW_SLEB128_7BIT(5), /* length */ \
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0x8f, /* DW_OP_breg31, rsp + constant */ \
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DW_SLEB128_28BIT(rsp_offs)
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#else
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# define CFI_STARTPROC()
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# define CFI_ENDPROC()
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# define CFI_REMEMBER_STATE()
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# define CFI_RESTORE_STATE()
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# define CFI_ADJUST_CFA_OFFSET(off)
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# define CFI_REL_OFFSET(reg,off)
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# define CFI_DEF_CFA_REGISTER(reg)
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# define CFI_REGISTER(ro,rn)
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# define CFI_RESTORE(reg)
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# define CFI_CFA_ON_STACK(rsp_offs,cfa_depth)
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# define CFI_REG_ON_STACK(reg,rsp_offs)
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#endif
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/* 'ret' instruction replacement for straight-line speculation mitigation */
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#define ret_spec_stop \
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ret; dsb sy; isb;
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#define CLEAR_REG(reg) movi reg.16b, #0;
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#define VPUSH_ABI \
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stp d8, d9, [sp, #-16]!; \
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CFI_ADJUST_CFA_OFFSET(16); \
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stp d10, d11, [sp, #-16]!; \
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CFI_ADJUST_CFA_OFFSET(16); \
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stp d12, d13, [sp, #-16]!; \
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CFI_ADJUST_CFA_OFFSET(16); \
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stp d14, d15, [sp, #-16]!; \
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CFI_ADJUST_CFA_OFFSET(16);
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#define VPOP_ABI \
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ldp d14, d15, [sp], #16; \
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CFI_ADJUST_CFA_OFFSET(-16); \
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ldp d12, d13, [sp], #16; \
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CFI_ADJUST_CFA_OFFSET(-16); \
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ldp d10, d11, [sp], #16; \
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CFI_ADJUST_CFA_OFFSET(-16); \
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ldp d8, d9, [sp], #16; \
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CFI_ADJUST_CFA_OFFSET(-16);
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#endif /* GCRY_ASM_COMMON_AARCH64_H */
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