| 1 | /* Copyright (C) 2005-2022 Free Software Foundation, Inc. |
|---|
| 2 | This file is part of the GNU C Library. |
|---|
| 3 | |
|---|
| 4 | The GNU C Library is free software; you can redistribute it and/or |
|---|
| 5 | modify it under the terms of the GNU Lesser General Public |
|---|
| 6 | License as published by the Free Software Foundation; either |
|---|
| 7 | version 2.1 of the License, or (at your option) any later version. |
|---|
| 8 | |
|---|
| 9 | In addition to the permissions in the GNU Lesser General Public |
|---|
| 10 | License, the Free Software Foundation gives you unlimited |
|---|
| 11 | permission to link the compiled version of this file with other |
|---|
| 12 | programs, and to distribute those programs without any restriction |
|---|
| 13 | coming from the use of this file. (The GNU Lesser General Public |
|---|
| 14 | License restrictions do apply in other respects; for example, they |
|---|
| 15 | cover modification of the file, and distribution when not linked |
|---|
| 16 | into another program.) |
|---|
| 17 | |
|---|
| 18 | Note that people who make modified versions of this file are not |
|---|
| 19 | obligated to grant this special exception for their modified |
|---|
| 20 | versions; it is their choice whether to do so. The GNU Lesser |
|---|
| 21 | General Public License gives permission to release a modified |
|---|
| 22 | version without this exception; this exception also makes it |
|---|
| 23 | possible to release a modified version which carries forward this |
|---|
| 24 | exception. |
|---|
| 25 | |
|---|
| 26 | The GNU C Library is distributed in the hope that it will be useful, |
|---|
| 27 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 28 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 29 | Lesser General Public License for more details. |
|---|
| 30 | |
|---|
| 31 | You should have received a copy of the GNU Lesser General Public |
|---|
| 32 | License along with the GNU C Library. If not, see |
|---|
| 33 | <https://www.gnu.org/licenses/>. */ |
|---|
| 34 | |
|---|
| 35 | #include <sysdep.h> |
|---|
| 36 | |
|---|
| 37 | /* GCC will emit calls to this routine under -mtp=soft. Linux has an |
|---|
| 38 | equivalent helper function (which clobbers fewer registers than |
|---|
| 39 | a normal function call) in a high page of memory; tail call to the |
|---|
| 40 | helper. */ |
|---|
| 41 | |
|---|
| 42 | .hidden __aeabi_read_tp |
|---|
| 43 | ENTRY (__aeabi_read_tp) |
|---|
| 44 | #ifdef ARCH_HAS_HARD_TP |
|---|
| 45 | mrc p15, 0, r0, c13, c0, 3 |
|---|
| 46 | bx lr |
|---|
| 47 | #elif defined(__thumb2__) |
|---|
| 48 | movw r0, #0x0fe0 |
|---|
| 49 | movt r0, #0xffff |
|---|
| 50 | bx r0 |
|---|
| 51 | #else |
|---|
| 52 | mov r0, #0xffff0fff |
|---|
| 53 | sub pc, r0, #31 |
|---|
| 54 | #endif |
|---|
| 55 | END (__aeabi_read_tp) |
|---|
| 56 | |
|---|
