diff options
Diffstat (limited to 'string/asmdefs.h')
| -rw-r--r-- | string/asmdefs.h | 69 |
1 files changed, 68 insertions, 1 deletions
diff --git a/string/asmdefs.h b/string/asmdefs.h index 7d143a9..340b427 100644 --- a/string/asmdefs.h +++ b/string/asmdefs.h @@ -1,13 +1,64 @@ /* * Macros for asm code. * - * Copyright (c) 2019, Arm Limited. + * Copyright (c) 2019-2020, Arm Limited. * SPDX-License-Identifier: MIT */ #ifndef _ASMDEFS_H #define _ASMDEFS_H +#if defined(__aarch64__) + +/* Branch Target Identitication support. */ +#define BTI_C hint 34 +#define BTI_J hint 36 +/* Return address signing support (pac-ret). */ +#define PACIASP hint 25; .cfi_window_save +#define AUTIASP hint 29; .cfi_window_save + +/* GNU_PROPERTY_AARCH64_* macros from elf.h. */ +#define FEATURE_1_AND 0xc0000000 +#define FEATURE_1_BTI 1 +#define FEATURE_1_PAC 2 + +/* Add a NT_GNU_PROPERTY_TYPE_0 note. */ +#define GNU_PROPERTY(type, value) \ + .section .note.gnu.property, "a"; \ + .p2align 3; \ + .word 4; \ + .word 16; \ + .word 5; \ + .asciz "GNU"; \ + .word type; \ + .word 4; \ + .word value; \ + .word 0; \ + .text + +/* If set then the GNU Property Note section will be added to + mark objects to support BTI and PAC-RET. */ +#ifndef WANT_GNU_PROPERTY +#define WANT_GNU_PROPERTY 1 +#endif + +#if WANT_GNU_PROPERTY +/* Add property note with supported features to all asm files. */ +GNU_PROPERTY (FEATURE_1_AND, FEATURE_1_BTI|FEATURE_1_PAC) +#endif + +#define ENTRY_ALIGN(name, alignment) \ + .global name; \ + .type name,%function; \ + .align alignment; \ + name: \ + .cfi_startproc; \ + BTI_C; + +#else + +#define END_FILE + #define ENTRY_ALIGN(name, alignment) \ .global name; \ .type name,%function; \ @@ -15,6 +66,8 @@ name: \ .cfi_startproc; +#endif + #define ENTRY(name) ENTRY_ALIGN(name, 6) #define ENTRY_ALIAS(name) \ @@ -28,4 +81,18 @@ #define L(l) .L ## l +#ifdef __ILP32__ + /* Sanitize padding bits of pointer arguments as per aapcs64 */ +#define PTR_ARG(n) mov w##n, w##n +#else +#define PTR_ARG(n) +#endif + +#ifdef __ILP32__ + /* Sanitize padding bits of size arguments as per aapcs64 */ +#define SIZE_ARG(n) mov w##n, w##n +#else +#define SIZE_ARG(n) +#endif + #endif |