91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/* asm-common-s390x.h - Common macros for zSeries assembly
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*
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* Copyright (C) 2020 Jussi Kivilinna <jussi.kivilinna@iki.fi>
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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_S390X_H
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#define GCRY_ASM_COMMON_S390X_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 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 15
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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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0x7f, /* DW_OP_breg15, 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)+160)
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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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0x7f, /* DW_OP_breg15, 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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#endif /* GCRY_ASM_COMMON_AMD64_H */
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