diff options
Diffstat (limited to 'sysdeps/aarch64/sysdep.h')
| -rw-r--r-- | sysdeps/aarch64/sysdep.h | 34 |
1 files changed, 33 insertions, 1 deletions
diff --git a/sysdeps/aarch64/sysdep.h b/sysdeps/aarch64/sysdep.h index 604c489170..4664329d3a 100644 --- a/sysdeps/aarch64/sysdep.h +++ b/sysdeps/aarch64/sysdep.h @@ -41,12 +41,42 @@ #define ASM_SIZE_DIRECTIVE(name) .size name,.-name +/* Branch Target Identitication support. */ +#define BTI_C hint 34 +#define BTI_J hint 36 + +/* GNU_PROPERTY_AARCH64_* macros from elf.h for use in asm code. */ +#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 + +/* Add GNU property note with the supported features to all asm code + where sysdep.h is included. */ +#if HAVE_AARCH64_BTI +GNU_PROPERTY (FEATURE_1_AND, FEATURE_1_BTI) +#endif + /* Define an entry point visible from C. */ #define ENTRY(name) \ .globl C_SYMBOL_NAME(name); \ .type C_SYMBOL_NAME(name),%function; \ .align 4; \ C_LABEL(name) \ + BTI_C; \ cfi_startproc; \ CALL_MCOUNT @@ -56,6 +86,7 @@ .type C_SYMBOL_NAME(name),%function; \ .p2align align; \ C_LABEL(name) \ + BTI_C; \ cfi_startproc; \ CALL_MCOUNT @@ -68,10 +99,11 @@ .globl C_SYMBOL_NAME(name); \ .type C_SYMBOL_NAME(name),%function; \ .p2align align; \ - .rep padding; \ + .rep padding - 1; /* -1 for bti c. */ \ nop; \ .endr; \ C_LABEL(name) \ + BTI_C; \ cfi_startproc; \ CALL_MCOUNT |