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aaf5420c | 1 | /* Save current context and install the given one. |
2b778ceb | 2 | Copyright (C) 2012-2021 Free Software Foundation, Inc. |
aaf5420c AS |
3 | This file is part of the GNU C Library. |
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 | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
aaf5420c AS |
18 | |
19 | #include <sysdep.h> | |
20 | ||
21 | #include "ucontext_i.h" | |
22 | ||
23 | ||
24 | ENTRY(__swapcontext) | |
25 | /* Load address of the context data structure we save in. */ | |
26 | move.l 4(%sp), %a0 | |
27 | ||
28 | /* Save the preserved registers and the return address. */ | |
29 | movem.l %d2-%d7, oGREGS+2*4(%a0) | |
30 | movem.l %a2-%a6, oGREGS+10*4(%a0) | |
31 | lea 4(%sp), %a1 | |
32 | move.l %a1, oSP(%a0) | |
33 | move.l (%sp), oPC(%a0) | |
34 | fmovem.l %fpsr/%fpcr/%fpiar, oFPREGS(%a0) | |
35 | fmovem.x %fp2-%fp7, oFP2(%a0) | |
36 | cfi_def_cfa (%a0, 0) | |
37 | cfi_offset (%d2, oGREGS+2*4) | |
38 | cfi_offset (%d3, oGREGS+3*4) | |
39 | cfi_offset (%a2, oGREGS+10*4) | |
40 | cfi_offset (%pc, oPC) | |
41 | ||
42 | /* Load address of the context data structure we have to load. */ | |
43 | move.l 8(%sp), %a1 | |
44 | ||
45 | /* Save the current signal mask and install the new one. */ | |
46 | lea oSIGMASK(%a0), %a2 | |
47 | move.l %a2, %d3 | |
48 | lea oSIGMASK(%a1), %a2 | |
49 | move.l %a2, %d2 | |
50 | move.l #SIG_SETMASK, %d1 | |
51 | move.l #__NR_sigprocmask, %d0 | |
52 | trap #0 | |
53 | cmp.l #-4095, %d0 /* Check %d0 for error. */ | |
54 | jcs 0f | |
55 | /* Restore registers. */ | |
56 | move.l oGREGS+2*4(%a0), %d2 | |
57 | cfi_restore (%d2) | |
58 | move.l oGREGS+3*4(%a0), %d3 | |
59 | cfi_restore (%d3) | |
60 | move.l oGREGS+10*4(%a0), %a2 | |
61 | cfi_restore (%a2) | |
62 | jra SYSCALL_ERROR_LABEL /* Jump to error handler. */ | |
63 | ||
64 | 0: /* Load the new stack pointer. */ | |
65 | move.l oSP(%a1), %sp | |
66 | cfi_def_cfa (%a1, 0) | |
67 | cfi_offset (%d2, oGREGS+2*4) | |
68 | cfi_offset (%d3, oGREGS+3*4) | |
69 | cfi_offset (%d4, oGREGS+4*4) | |
70 | cfi_offset (%d5, oGREGS+5*4) | |
71 | cfi_offset (%d6, oGREGS+6*4) | |
72 | cfi_offset (%d7, oGREGS+7*4) | |
73 | cfi_offset (%a2, oGREGS+10*4) | |
74 | cfi_offset (%a3, oGREGS+11*4) | |
75 | cfi_offset (%a4, oGREGS+12*4) | |
76 | cfi_offset (%a5, oGREGS+13*4) | |
77 | cfi_offset (%a6, oGREGS+14*4) | |
78 | cfi_offset (%fp2, oFP2+0*12) | |
79 | cfi_offset (%fp3, oFP2+1*12) | |
80 | cfi_offset (%fp4, oFP2+2*12) | |
81 | cfi_offset (%fp5, oFP2+3*12) | |
82 | cfi_offset (%fp6, oFP2+4*12) | |
83 | cfi_offset (%fp7, oFP2+5*12) | |
84 | cfi_offset (%pc, oPC) | |
85 | ||
86 | /* Load the values of all the preserved registers (except SP). */ | |
87 | movem.l oGREGS+2*4(%a1), %d2-%d7 | |
88 | movem.l oGREGS+10*4(%a1), %a2-%a6 | |
89 | fmovem.l oFPREGS(%a1), %fpsr/%fpcr/%fpiar | |
90 | fmovem.x oFP2(%a1), %fp2-%fp7 | |
91 | ||
92 | /* Clear D0 to indicate success. */ | |
93 | clr.l %d0 | |
94 | ||
95 | /* Fetch the address to return to. */ | |
96 | move.l oPC(%a1), %a0 | |
97 | ||
98 | /* End FDE here, we fall into another context. */ | |
99 | cfi_endproc | |
100 | cfi_startproc | |
101 | cfi_register (%pc, %a0) | |
102 | ||
103 | jmp (%a0) | |
104 | ||
105 | cfi_offset (%pc, -4) | |
106 | PSEUDO_END(__swapcontext) | |
107 | ||
108 | weak_alias (__swapcontext, swapcontext) |