| // Copyright (c) 2015, 2022, Red Hat Inc. All rights reserved. |
| // Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved. |
| // DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| // |
| // This code is free software; you can redistribute it and/or modify it |
| // under the terms of the GNU General Public License version 2 only, as |
| // published by the Free Software Foundation. |
| // |
| // This code 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 General Public License |
| // version 2 for more details (a copy is included in the LICENSE file that |
| // accompanied this code). |
| // |
| // You should have received a copy of the GNU General Public License version |
| // 2 along with this work; if not, write to the Free Software Foundation, |
| // Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| // |
| // Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| // or visit www.oracle.com if you need additional information or have any |
| // questions. |
| |
| #include "defs.S.inc" |
| |
| // JavaThread::aarch64_get_thread_helper() |
| // |
| // Return the current thread pointer in x0. |
| // Clobber x1, flags. |
| // All other registers are preserved, |
| |
| DECLARE_FUNC(_ZN10JavaThread25aarch64_get_thread_helperEv): |
| hint #0x19 // paciasp |
| stp x29, x30, [sp, -16]! |
| adrp x0, :tlsdesc:_ZN6Thread12_thr_currentE |
| ldr x1, [x0, #:tlsdesc_lo12:_ZN6Thread12_thr_currentE] |
| add x0, x0, :tlsdesc_lo12:_ZN6Thread12_thr_currentE |
| .tlsdesccall _ZN6Thread12_thr_currentE |
| blr x1 |
| mrs x1, tpidr_el0 |
| add x0, x1, x0 |
| ldr x0, [x0] |
| ldp x29, x30, [sp], 16 |
| hint #0x1d // autiasp |
| ret |
| |
| .size _ZN10JavaThread25aarch64_get_thread_helperEv, .-_ZN10JavaThread25aarch64_get_thread_helperEv |
| |
| /* Emit .note.gnu.property section in case of PAC or BTI being enabled. |
| * For more details see "ELF for the Arm(R) 64-bit Architecture (AArch64)". |
| * https://github.com/ARM-software/abi-aa/blob/main/aaelf64/aaelf64.rst |
| */ |
| #ifdef __ARM_FEATURE_BTI_DEFAULT |
| #ifdef __ARM_FEATURE_PAC_DEFAULT |
| #define GNU_PROPERTY_AARCH64_FEATURE 3 |
| #else |
| #define GNU_PROPERTY_AARCH64_FEATURE 1 |
| #endif |
| #else |
| #ifdef __ARM_FEATURE_PAC_DEFAULT |
| #define GNU_PROPERTY_AARCH64_FEATURE 2 |
| #else |
| #define GNU_PROPERTY_AARCH64_FEATURE 0 |
| #endif |
| #endif |
| |
| #if (GNU_PROPERTY_AARCH64_FEATURE != 0) |
| .pushsection .note.gnu.property, "a" |
| .align 3 |
| .long 4 /* name length */ |
| .long 0x10 /* data length */ |
| .long 5 /* note type: NT_GNU_PROPERTY_TYPE_0 */ |
| .string "GNU" /* vendor name */ |
| .long 0xc0000000 /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */ |
| .long 4 /* pr_datasze */ |
| .long GNU_PROPERTY_AARCH64_FEATURE |
| .long 0 |
| .popsection |
| #endif |
