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b168057a | 1 | /* Copyright (C) 2002-2015 Free Software Foundation, Inc. |
db5f2fc9 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
db5f2fc9 UD |
18 | |
19 | #include <sysdep.h> | |
e51deae7 | 20 | #include <lowlevellock.h> |
db5f2fc9 | 21 | #include <shlib-compat.h> |
326132db | 22 | #include <pthread-errnos.h> |
3d2dd6ca | 23 | #include <structsem.h> |
db5f2fc9 | 24 | |
db5f2fc9 UD |
25 | |
26 | .text | |
27 | ||
7588880f UD |
28 | .globl sem_wait |
29 | .type sem_wait,@function | |
db5f2fc9 | 30 | .align 16 |
7588880f | 31 | sem_wait: |
3d2dd6ca | 32 | .LSTARTCODE: |
c3c2f3cf UD |
33 | cfi_startproc |
34 | #ifdef SHARED | |
35 | cfi_personality(DW_EH_PE_pcrel | DW_EH_PE_sdata4 | DW_EH_PE_indirect, | |
36 | DW.ref.__gcc_personality_v0) | |
37 | cfi_lsda(DW_EH_PE_pcrel | DW_EH_PE_sdata4, .LexceptSTART) | |
38 | #else | |
39 | cfi_personality(DW_EH_PE_udata4, __gcc_personality_v0) | |
40 | cfi_lsda(DW_EH_PE_udata4, .LexceptSTART) | |
41 | #endif | |
7726edc2 | 42 | |
3d2dd6ca | 43 | #if VALUE == 0 |
0adae468 | 44 | movl (%rdi), %eax |
3d2dd6ca | 45 | #else |
0adae468 | 46 | movl VALUE(%rdi), %eax |
3d2dd6ca | 47 | #endif |
db5f2fc9 UD |
48 | 2: testl %eax, %eax |
49 | je 1f | |
50 | ||
3d2dd6ca | 51 | leal -1(%rax), %edx |
db5f2fc9 | 52 | LOCK |
3d2dd6ca | 53 | #if VALUE == 0 |
0adae468 | 54 | cmpxchgl %edx, (%rdi) |
3d2dd6ca | 55 | #else |
0adae468 | 56 | cmpxchgl %edx, VALUE(%rdi) |
3d2dd6ca | 57 | #endif |
db5f2fc9 | 58 | jne 2b |
db5f2fc9 | 59 | |
0adae468 | 60 | xorl %eax, %eax |
db5f2fc9 UD |
61 | retq |
62 | ||
9083bcc5 UD |
63 | /* This push is only needed to store the sem_t pointer for the |
64 | exception handler. */ | |
65 | 1: pushq %rdi | |
0adae468 | 66 | cfi_adjust_cfa_offset(8) |
0adae468 UD |
67 | |
68 | LOCK | |
dde05f00 | 69 | LP_OP(add) $1, NWAITERS(%rdi) |
3d2dd6ca UD |
70 | |
71 | .LcleanupSTART: | |
72 | 6: call __pthread_enable_asynccancel | |
7726edc2 UD |
73 | movl %eax, %r8d |
74 | ||
75 | xorq %r10, %r10 | |
ee618985 | 76 | movl $SYS_futex, %eax |
42e6c665 UD |
77 | #if FUTEX_WAIT == 0 |
78 | movl PRIVATE(%rdi), %esi | |
79 | #else | |
3d2dd6ca | 80 | movl $FUTEX_WAIT, %esi |
42e6c665 UD |
81 | orl PRIVATE(%rdi), %esi |
82 | #endif | |
3d2dd6ca | 83 | xorl %edx, %edx |
db5f2fc9 | 84 | syscall |
9083bcc5 | 85 | movq %rax, %rcx |
7726edc2 | 86 | |
9083bcc5 | 87 | xchgq %r8, %rdi |
7726edc2 | 88 | call __pthread_disable_asynccancel |
3d2dd6ca | 89 | .LcleanupEND: |
9083bcc5 | 90 | movq %r8, %rdi |
db5f2fc9 | 91 | |
9083bcc5 | 92 | testq %rcx, %rcx |
3d2dd6ca | 93 | je 3f |
9083bcc5 | 94 | cmpq $-EWOULDBLOCK, %rcx |
3d2dd6ca UD |
95 | jne 4f |
96 | ||
97 | 3: | |
98 | #if VALUE == 0 | |
9083bcc5 | 99 | movl (%rdi), %eax |
3d2dd6ca | 100 | #else |
9083bcc5 | 101 | movl VALUE(%rdi), %eax |
3d2dd6ca UD |
102 | #endif |
103 | 5: testl %eax, %eax | |
104 | je 6b | |
105 | ||
106 | leal -1(%rax), %edx | |
107 | LOCK | |
108 | #if VALUE == 0 | |
9083bcc5 | 109 | cmpxchgl %edx, (%rdi) |
3d2dd6ca | 110 | #else |
9083bcc5 | 111 | cmpxchgl %edx, VALUE(%rdi) |
3d2dd6ca UD |
112 | #endif |
113 | jne 5b | |
114 | ||
0adae468 UD |
115 | xorl %eax, %eax |
116 | ||
9083bcc5 | 117 | 9: LOCK |
dde05f00 | 118 | LP_OP(sub) $1, NWAITERS(%rdi) |
9083bcc5 UD |
119 | |
120 | leaq 8(%rsp), %rsp | |
0adae468 | 121 | cfi_adjust_cfa_offset(-8) |
0adae468 UD |
122 | |
123 | retq | |
124 | ||
9083bcc5 UD |
125 | cfi_adjust_cfa_offset(8) |
126 | 4: negq %rcx | |
db5f2fc9 | 127 | movq errno@gottpoff(%rip), %rdx |
9083bcc5 | 128 | movl %ecx, %fs:(%rdx) |
db5f2fc9 | 129 | orl $-1, %eax |
7726edc2 | 130 | |
3d2dd6ca | 131 | jmp 9b |
7588880f | 132 | .size sem_wait,.-sem_wait |
3d2dd6ca UD |
133 | |
134 | ||
135 | .type sem_wait_cleanup,@function | |
136 | sem_wait_cleanup: | |
9083bcc5 | 137 | movq (%rsp), %rdi |
3d2dd6ca | 138 | LOCK |
dde05f00 | 139 | LP_OP(sub) $1, NWAITERS(%rdi) |
3d2dd6ca UD |
140 | movq %rax, %rdi |
141 | .LcallUR: | |
142 | call _Unwind_Resume@PLT | |
143 | hlt | |
144 | .LENDCODE: | |
c3c2f3cf | 145 | cfi_endproc |
3d2dd6ca UD |
146 | .size sem_wait_cleanup,.-sem_wait_cleanup |
147 | ||
148 | ||
149 | .section .gcc_except_table,"a",@progbits | |
150 | .LexceptSTART: | |
c3c2f3cf UD |
151 | .byte DW_EH_PE_omit # @LPStart format |
152 | .byte DW_EH_PE_omit # @TType format | |
153 | .byte DW_EH_PE_uleb128 # call-site format | |
3d2dd6ca UD |
154 | .uleb128 .Lcstend-.Lcstbegin |
155 | .Lcstbegin: | |
156 | .uleb128 .LcleanupSTART-.LSTARTCODE | |
157 | .uleb128 .LcleanupEND-.LcleanupSTART | |
158 | .uleb128 sem_wait_cleanup-.LSTARTCODE | |
159 | .uleb128 0 | |
160 | .uleb128 .LcallUR-.LSTARTCODE | |
161 | .uleb128 .LENDCODE-.LcallUR | |
162 | .uleb128 0 | |
163 | .uleb128 0 | |
164 | .Lcstend: | |
165 | ||
166 | ||
3d2dd6ca UD |
167 | #ifdef SHARED |
168 | .hidden DW.ref.__gcc_personality_v0 | |
169 | .weak DW.ref.__gcc_personality_v0 | |
170 | .section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits | |
dde05f00 | 171 | .align LP_SIZE |
3d2dd6ca | 172 | .type DW.ref.__gcc_personality_v0, @object |
dde05f00 | 173 | .size DW.ref.__gcc_personality_v0, LP_SIZE |
3d2dd6ca | 174 | DW.ref.__gcc_personality_v0: |
dde05f00 | 175 | ASM_ADDR __gcc_personality_v0 |
3d2dd6ca | 176 | #endif |