/*
* Copyright © 2008 Mozilla Corporation
* Copyright © 2010 Nokia Corporation
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Mozilla Corporation not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Mozilla Corporation makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
* AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
*
* Author: Jeff Muizelaar (jeff@infidigm.net)
*
*/
#ifndef PIXMAN_ARM_ASM_H
#define PIXMAN_ARM_ASM_H
#ifdef HAVE_CONFIG_H
#include "pixman-config.h"
#endif
/*
* References:
* - https://developer.arm.com/documentation/101028/0012/5--Feature-test-macros
* - https://github.com/ARM-software/abi-aa/blob/main/aaelf64/aaelf64.rst
*/
#if defined(__ARM_FEATURE_BTI_DEFAULT) && __ARM_FEATURE_BTI_DEFAULT == 1
#define BTI_C hint 34
/* bti c: for calls, IE bl instructions */
#define GNU_PROPERTY_AARCH64_BTI 1
/* bit 0 GNU Notes is for BTI support */
#else
#define BTI_C
#define GNU_PROPERTY_AARCH64_BTI 0
#endif
#if defined(__ARM_FEATURE_PAC_DEFAULT)
#if __ARM_FEATURE_PAC_DEFAULT & 1
#define SIGN_LR hint 25
/* paciasp: sign with the A key */
#define VERIFY_LR hint 29
/* autiasp: verify with the b key */
#elif __ARM_FEATURE_PAC_DEFAULT & 2
#define SIGN_LR hint 27
/* pacibsp: sign with the b key */
#define VERIFY_LR hint 31
/* autibsp: verify with the b key */
#endif
#define GNU_PROPERTY_AARCH64_POINTER_AUTH 2
/* bit 1 GNU Notes is for PAC support */
#else
#define SIGN_LR BTI_C
#define VERIFY_LR
#define GNU_PROPERTY_AARCH64_POINTER_AUTH 0
#endif
/* Add the BTI support to GNU Notes section for ASM files */
#if GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_POINTER_AUTH != 0
.pushsection .note.gnu.property,
"a";
/* Start a new allocatable section */
.balign 8;
/* align it on a byte boundry */
.
long 4;
/* size of "GNU\0" */
.
long 0x10;
/* size of descriptor */
.
long 0x5;
/* NT_GNU_PROPERTY_TYPE_0 */
.asciz
"GNU";
.
long 0xc0000000;
/* GNU_PROPERTY_AARCH64_FEATURE_1_AND */
.
long 4;
/* Four bytes of data */
.
long (GNU_PROPERTY_AARCH64_BTI|GNU_PROPERTY_AARCH64_POINTER_AUTH);
/* BTI or PAC is enabled */
.
long 0;
/* padding for 8 byte alignment */
.popsection;
/* end the section */
#endif
/* Supplementary macro for setting function attributes */
.macro pixman_asm_function_impl fname
#ifdef ASM_HAVE_FUNC_DIRECTIVE
.func \fname
#endif
.global \fname
#ifdef __ELF__
.hidden \fname
.type \fname, %function
#endif
\fname:
SIGN_LR
.endm
.macro pixman_asm_function fname
#ifdef ASM_LEADING_UNDERSCORE
pixman_asm_function_impl _\fname
#else
pixman_asm_function_impl \fname
#endif
.endm
.macro pixman_syntax_unified
#ifdef ASM_HAVE_SYNTAX_UNIFIED
.syntax unified
#endif
.endm
.macro pixman_end_asm_function
#ifdef ASM_HAVE_FUNC_DIRECTIVE
.endfunc
#endif
.endm
#endif /* PIXMAN_ARM_ASM_H */
