asm-common-amd64.h

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/* asm-common-amd64.h  -  Common macros for AMD64 assembly

 * Copyright (C) 2018 Jussi Kivilinna <jussi.kivilinna@iki.fi>

 * This file is part of Libgcrypt.

 * Libgcrypt is free software; you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as

 * published by the Free Software Foundation; either version 2.1 of

 * the License, or (at your option) any later version.

 * Libgcrypt is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Lesser General Public License for more details.

 * You should have received a copy of the GNU Lesser General Public

 * License along with this program; if not, see <http://www.gnu.org/licenses/>.

*/

#ifndef GCRY_ASM_COMMON_AMD64_H

#define GCRY_ASM_COMMON_AMD64_H

#include <config.h>

#ifdef HAVE_COMPATIBLE_GCC_AMD64_PLATFORM_AS

# define ELF(...) __VA_ARGS__

#else

# define ELF(...) /*_*/

#endif

#ifdef __PIC__

#  define rRIP (%rip)

#else

#  define rRIP

#endif

#ifdef __PIC__

#  define RIP %rip

#else

#  define RIP

#endif

#ifdef __PIC__

#  define ADD_RIP +rip

#else

#  define ADD_RIP

#endif

#if defined(HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS) || !defined(__PIC__)

#  define GET_EXTERN_POINTER(name, reg) movabsq $name, reg

#else

#  ifdef __code_model_large__

#    define GET_EXTERN_POINTER(name, reg) \

	       pushq %r15; \

	       pushq %r14; \

	    1: leaq 1b(%rip), reg; \

	       movabsq $_GLOBAL_OFFSET_TABLE_-1b, %r14; \

	       movabsq $name@GOT, %r15; \

	       addq %r14, reg; \

	       popq %r14; \

	       movq (reg, %r15), reg; \

	       popq %r15;

#  else

#    define GET_EXTERN_POINTER(name, reg) movq name@GOTPCREL(%rip), reg

#  endif

#endif

#ifdef HAVE_GCC_ASM_CFI_DIRECTIVES

/* CFI directives to emit DWARF stack unwinding information. */

# define CFI_STARTPROC()            .cfi_startproc

# define CFI_ENDPROC()              .cfi_endproc

# define CFI_REMEMBER_STATE()       .cfi_remember_state

# define CFI_RESTORE_STATE()        .cfi_restore_state

# define CFI_ADJUST_CFA_OFFSET(off) .cfi_adjust_cfa_offset off

# define CFI_REL_OFFSET(reg,off)    .cfi_rel_offset reg, off

# define CFI_DEF_CFA_REGISTER(reg)  .cfi_def_cfa_register reg

# define CFI_REGISTER(ro,rn)        .cfi_register ro, rn

# define CFI_RESTORE(reg)           .cfi_restore reg

# define CFI_PUSH(reg) \

	CFI_ADJUST_CFA_OFFSET(8); CFI_REL_OFFSET(reg, 0)

# define CFI_POP(reg) \

	CFI_ADJUST_CFA_OFFSET(-8); CFI_RESTORE(reg)

# define CFI_POP_TMP_REG() \

	CFI_ADJUST_CFA_OFFSET(-8);

# define CFI_LEAVE() \

	CFI_ADJUST_CFA_OFFSET(-8); CFI_DEF_CFA_REGISTER(%rsp)

/* CFA expressions are used for pointing CFA and registers to

 * %rsp relative offsets. */

# define DW_REGNO_rax 0

# define DW_REGNO_rdx 1

# define DW_REGNO_rcx 2

# define DW_REGNO_rbx 3

# define DW_REGNO_rsi 4

# define DW_REGNO_rdi 5

# define DW_REGNO_rbp 6

# define DW_REGNO_rsp 7

# define DW_REGNO_r8  8

# define DW_REGNO_r9  9

# define DW_REGNO_r10 10

# define DW_REGNO_r11 11

# define DW_REGNO_r12 12

# define DW_REGNO_r13 13

# define DW_REGNO_r14 14

# define DW_REGNO_r15 15

# define DW_REGNO(reg) DW_REGNO_ ## reg

/* Fixed length encoding used for integers for now. */

# define DW_SLEB128_7BIT(value) \

	0x00|((value) & 0x7f)

# define DW_SLEB128_28BIT(value) \

	0x80|((value)&0x7f), \

	0x80|(((value)>>7)&0x7f), \

	0x80|(((value)>>14)&0x7f), \

	0x00|(((value)>>21)&0x7f)

# define CFI_CFA_ON_STACK(rsp_offs,cfa_depth) \

	.cfi_escape \

	  0x0f, /* DW_CFA_def_cfa_expression */ \

	    DW_SLEB128_7BIT(11), /* length */ \

	  0x77, /* DW_OP_breg7, rsp + constant */ \

	    DW_SLEB128_28BIT(rsp_offs), \

	  0x06, /* DW_OP_deref */ \

	  0x23, /* DW_OP_plus_constu */ \

	    DW_SLEB128_28BIT((cfa_depth)+8)

# define CFI_REG_ON_STACK(reg,rsp_offs) \

	.cfi_escape \

	  0x10, /* DW_CFA_expression */ \

	    DW_SLEB128_7BIT(DW_REGNO(reg)), \

	    DW_SLEB128_7BIT(5), /* length */ \

	  0x77, /* DW_OP_breg7, rsp + constant */ \

	    DW_SLEB128_28BIT(rsp_offs)

#else

# define CFI_STARTPROC()

# define CFI_ENDPROC()

# define CFI_REMEMBER_STATE()

# define CFI_RESTORE_STATE()

# define CFI_ADJUST_CFA_OFFSET(off)

# define CFI_REL_OFFSET(reg,off)

# define CFI_DEF_CFA_REGISTER(reg)

# define CFI_REGISTER(ro,rn)

# define CFI_RESTORE(reg)

# define CFI_PUSH(reg)

# define CFI_POP(reg)

# define CFI_POP_TMP_REG()

# define CFI_LEAVE()

# define CFI_CFA_ON_STACK(rsp_offs,cfa_depth)

# define CFI_REG_ON_STACK(reg,rsp_offs)

#endif

#ifdef HAVE_COMPATIBLE_GCC_WIN64_PLATFORM_AS

# define ENTER_SYSV_FUNC_PARAMS_0_4 \

	pushq %rdi; \

	CFI_PUSH(%rdi); \

	pushq %rsi; \

	CFI_PUSH(%rsi); \

	movq %rcx, %rdi; \

	movq %rdx, %rsi; \

	movq %r8, %rdx; \

	movq %r9, %rcx; \

# define ENTER_SYSV_FUNC_PARAMS_5 \

	ENTER_SYSV_FUNC_PARAMS_0_4; \

	movq 0x38(%rsp), %r8;

# define ENTER_SYSV_FUNC_PARAMS_6 \

	ENTER_SYSV_FUNC_PARAMS_5; \

	movq 0x40(%rsp), %r9;

# define EXIT_SYSV_FUNC \

	popq %rsi; \

	CFI_POP(%rsi); \

	popq %rdi; \

	CFI_POP(%rdi);

#else

# define ENTER_SYSV_FUNC_PARAMS_0_4

# define ENTER_SYSV_FUNC_PARAMS_5

# define ENTER_SYSV_FUNC_PARAMS_6

# define EXIT_SYSV_FUNC

#endif

#endif /* GCRY_ASM_COMMON_AMD64_H */