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1 | /* Copyright (C) 2010 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010. | |
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 | In addition to the permissions in the GNU Lesser General Public | |
11 | License, the Free Software Foundation gives you unlimited | |
12 | permission to link the compiled version of this file with other | |
13 | programs, and to distribute those programs without any restriction | |
14 | coming from the use of this file. (The GNU Lesser General Public | |
15 | License restrictions do apply in other respects; for example, they | |
16 | cover modification of the file, and distribution when not linked | |
17 | into another program.) | |
18 | ||
19 | Note that people who make modified versions of this file are not | |
20 | obligated to grant this special exception for their modified | |
21 | versions; it is their choice whether to do so. The GNU Lesser | |
22 | General Public License gives permission to release a modified | |
23 | version without this exception; this exception also makes it | |
24 | possible to release a modified version which carries forward this | |
25 | exception. | |
26 | ||
27 | The GNU C Library is distributed in the hope that it will be useful, | |
28 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
30 | Lesser General Public License for more details. | |
31 | ||
32 | You should have received a copy of the GNU Lesser General Public | |
33 | License along with the GNU C Library; if not, write to the Free | |
34 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
35 | 02111-1307 USA. */ | |
36 | ||
37 | #include <sysdep.h> | |
38 | #include <bits/m68k-vdso.h> | |
39 | ||
40 | .text | |
41 | ||
42 | .hidden __vdso_read_tp_stub | |
43 | ENTRY (__vdso_read_tp_stub) | |
44 | cfi_startproc | |
45 | move.l #__NR_get_thread_area, %d0 | |
46 | trap #0 | |
47 | move.l %d0, %a0 | |
48 | rts | |
49 | cfi_endproc | |
50 | END (__vdso_read_tp_stub) | |
51 | ||
52 | # ifdef SHARED | |
53 | /* GCC will emit calls to this routine. Linux has an | |
54 | equivalent helper function (which clobbers fewer registers than | |
55 | a normal function call) in a vdso; tail call to the | |
56 | helper. */ | |
57 | # ifdef IS_IN_rtld | |
58 | /* rtld gets a hidden copy of __m68k_read_tp. */ | |
59 | .hidden __m68k_read_tp | |
60 | # endif | |
61 | ENTRY (__m68k_read_tp) | |
62 | cfi_startproc | |
63 | move.l #_GLOBAL_OFFSET_TABLE_@GOTPC, %a0 | |
64 | lea (-6, %pc, %a0), %a0 | |
65 | move.l M68K_VDSO_SYMBOL (__vdso_read_tp)@GOT(%a0), %a0 | |
66 | move.l (%a0), %a0 | |
67 | jmp (%a0) | |
68 | cfi_endproc | |
69 | END (__m68k_read_tp) | |
70 | ||
71 | /* The following two stubs are for macros in atomic.h, they can't | |
72 | clobber anything. */ | |
73 | ||
74 | .hidden __vdso_atomic_cmpxchg_32_stub | |
75 | ENTRY (__vdso_atomic_cmpxchg_32_stub) | |
76 | cfi_startproc | |
77 | move.l %d2, -(%sp) | |
78 | cfi_adjust_cfa_offset (4) | |
79 | cfi_rel_offset (%d2, 0) | |
80 | move.l %d0, %d2 | |
81 | move.l #SYS_ify (atomic_cmpxchg_32), %d0 | |
82 | trap #0 | |
83 | move.l (%sp)+, %d2 | |
84 | cfi_adjust_cfa_offset (-4) | |
85 | cfi_restore (%d2) | |
86 | rts | |
87 | cfi_endproc | |
88 | END (__vdso_atomic_cmpxchg_32_stub) | |
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90 | .hidden __vdso_atomic_barrier_stub |
91 | ENTRY (__vdso_atomic_barrier_stub) | |
92 | cfi_startproc | |
93 | move.l %d0, -(%sp) | |
94 | cfi_adjust_cfa_offset (4) | |
95 | move.l #SYS_ify (atomic_barrier), %d0 | |
96 | trap #0 | |
97 | move.l (%sp)+, %d0 | |
98 | cfi_adjust_cfa_offset (-4) | |
99 | rts | |
100 | cfi_endproc | |
101 | END (__vdso_atomic_barrier_stub) | |
102 | # else /* !SHARED */ | |
103 | /* If the vDSO is not available, use a syscall to get TP. */ | |
104 | strong_alias (__vdso_read_tp_stub, __m68k_read_tp) | |
105 | # endif /* SHARED */ |