pixman-arm-asm.h - mozsearch

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/*

 * 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 */