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99dee823 | 1 | /* Copyright (C) 2014-2021 Free Software Foundation, Inc. |
b17f08dd RH |
2 | Contributed by Richard Henderson <rth@redhat.com>. |
3 | ||
4 | This file is part of the GNU Transactional Memory Library (libitm). | |
5 | ||
6 | Libitm is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | Libitm is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
13 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
14 | more details. | |
15 | ||
16 | Under Section 7 of GPL version 3, you are granted additional | |
17 | permissions described in the GCC Runtime Library Exception, version | |
18 | 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | You should have received a copy of the GNU General Public License and | |
21 | a copy of the GCC Runtime Library Exception along with this program; | |
22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | <http://www.gnu.org/licenses/>. */ | |
24 | ||
25 | #include "asmcfi.h" | |
26 | ||
319078da | 27 | #define BTI_C hint 34 |
ab240ab5 SN |
28 | #define PACIASP hint 25 |
29 | #define AUTIASP hint 29 | |
30 | #define PACIBSP hint 27 | |
31 | #define AUTIBSP hint 31 | |
32 | ||
33 | #if defined(HAVE_AS_CFI_PSEUDO_OP) && defined(__GCC_HAVE_DWARF2_CFI_ASM) | |
34 | # define cfi_window_save .cfi_window_save | |
35 | # define cfi_b_key_frame .cfi_b_key_frame | |
36 | #else | |
37 | # define cfi_window_save | |
38 | # define cfi_b_key_frame | |
39 | #endif | |
40 | ||
41 | #if __ARM_FEATURE_PAC_DEFAULT & 1 | |
42 | # define CFI_PAC_TOGGLE cfi_window_save | |
43 | # define CFI_PAC_KEY | |
44 | # define PAC_AND_BTI PACIASP | |
45 | # define AUT AUTIASP | |
46 | #elif __ARM_FEATURE_PAC_DEFAULT & 2 | |
47 | # define CFI_PAC_TOGGLE cfi_window_save | |
48 | # define CFI_PAC_KEY cfi_b_key_frame | |
49 | # define PAC_AND_BTI PACIBSP | |
50 | # define AUT AUTIBSP | |
51 | #else | |
52 | # define CFI_PAC_TOGGLE | |
53 | # define CFI_PAC_KEY | |
54 | # define PAC_AND_BTI BTI_C | |
55 | # define AUT | |
56 | #endif | |
319078da | 57 | |
b17f08dd RH |
58 | .text |
59 | .align 2 | |
60 | .global _ITM_beginTransaction | |
61 | .type _ITM_beginTransaction, %function | |
62 | ||
63 | _ITM_beginTransaction: | |
64 | cfi_startproc | |
ab240ab5 SN |
65 | CFI_PAC_KEY |
66 | PAC_AND_BTI | |
67 | CFI_PAC_TOGGLE | |
b17f08dd RH |
68 | mov x1, sp |
69 | stp x29, x30, [sp, -11*16]! | |
70 | cfi_adjust_cfa_offset(11*16) | |
71 | cfi_rel_offset(x29, 0) | |
72 | cfi_rel_offset(x30, 8) | |
73 | mov x29, sp | |
74 | stp x19, x20, [sp, 1*16] | |
75 | stp x21, x22, [sp, 2*16] | |
76 | stp x23, x24, [sp, 3*16] | |
77 | stp x25, x26, [sp, 4*16] | |
78 | stp x27, x28, [sp, 5*16] | |
79 | stp d8, d9, [sp, 6*16] | |
80 | stp d10, d11, [sp, 7*16] | |
81 | stp d12, d13, [sp, 8*16] | |
82 | stp d14, d15, [sp, 9*16] | |
83 | str x1, [sp, 10*16] | |
84 | ||
85 | /* Invoke GTM_begin_transaction with the struct we just built. */ | |
86 | mov x1, sp | |
87 | bl GTM_begin_transaction | |
88 | ||
89 | /* Return; we don't need to restore any of the call-saved regs. */ | |
b6334cf4 | 90 | ldp x29, x30, [sp], 11*16 |
b17f08dd RH |
91 | cfi_adjust_cfa_offset(-11*16) |
92 | cfi_restore(x29) | |
93 | cfi_restore(x30) | |
ab240ab5 SN |
94 | AUT |
95 | CFI_PAC_TOGGLE | |
b17f08dd RH |
96 | ret |
97 | cfi_endproc | |
98 | .size _ITM_beginTransaction, . - _ITM_beginTransaction | |
99 | ||
100 | .align 2 | |
101 | .global GTM_longjmp | |
102 | .hidden GTM_longjmp | |
103 | .type GTM_longjmp, %function | |
104 | ||
105 | GTM_longjmp: | |
106 | /* The first parameter becomes the return value (x0). | |
107 | The third parameter is ignored for now. */ | |
108 | cfi_startproc | |
ab240ab5 | 109 | CFI_PAC_KEY |
319078da | 110 | BTI_C |
b17f08dd RH |
111 | ldp x19, x20, [x1, 1*16] |
112 | ldp x21, x22, [x1, 2*16] | |
113 | ldp x23, x24, [x1, 3*16] | |
114 | ldp x25, x26, [x1, 4*16] | |
115 | ldp x27, x28, [x1, 5*16] | |
116 | ldp d8, d9, [x1, 6*16] | |
117 | ldp d10, d11, [x1, 7*16] | |
118 | ldp d12, d13, [x1, 8*16] | |
119 | ldp d14, d15, [x1, 9*16] | |
120 | ldr x3, [x1, 10*16] | |
121 | ldp x29, x30, [x1] | |
122 | cfi_def_cfa(x1, 0) | |
ab240ab5 | 123 | CFI_PAC_TOGGLE |
b17f08dd | 124 | mov sp, x3 |
ab240ab5 SN |
125 | AUT |
126 | CFI_PAC_TOGGLE | |
b17f08dd RH |
127 | br x30 |
128 | cfi_endproc | |
129 | .size GTM_longjmp, . - GTM_longjmp | |
130 | ||
319078da SN |
131 | /* GNU_PROPERTY_AARCH64_* macros from elf.h for use in asm code. */ |
132 | #define FEATURE_1_AND 0xc0000000 | |
133 | #define FEATURE_1_BTI 1 | |
134 | #define FEATURE_1_PAC 2 | |
135 | ||
ab240ab5 SN |
136 | /* Supported features based on the code generation options. */ |
137 | #if defined(__ARM_FEATURE_BTI_DEFAULT) | |
138 | # define BTI_FLAG FEATURE_1_BTI | |
139 | #else | |
140 | # define BTI_FLAG 0 | |
141 | #endif | |
142 | ||
143 | #if __ARM_FEATURE_PAC_DEFAULT & 3 | |
144 | # define PAC_FLAG FEATURE_1_PAC | |
145 | #else | |
146 | # define PAC_FLAG 0 | |
147 | #endif | |
148 | ||
319078da SN |
149 | /* Add a NT_GNU_PROPERTY_TYPE_0 note. */ |
150 | #define GNU_PROPERTY(type, value) \ | |
151 | .section .note.gnu.property, "a"; \ | |
152 | .p2align 3; \ | |
153 | .word 4; \ | |
154 | .word 16; \ | |
155 | .word 5; \ | |
156 | .asciz "GNU"; \ | |
157 | .word type; \ | |
158 | .word 4; \ | |
159 | .word value; \ | |
160 | .word 0; | |
161 | ||
463ba375 | 162 | #if defined(__linux__) || defined(__FreeBSD__) |
b17f08dd | 163 | .section .note.GNU-stack, "", %progbits |
319078da SN |
164 | |
165 | /* Add GNU property note if built with branch protection. */ | |
ab240ab5 SN |
166 | # if (BTI_FLAG|PAC_FLAG) != 0 |
167 | GNU_PROPERTY (FEATURE_1_AND, BTI_FLAG|PAC_FLAG) | |
319078da | 168 | # endif |
b17f08dd | 169 | #endif |