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04277e02 | 1 | /* Copyright (C) 1991-2019 Free Software Foundation, Inc. |
5107cf1d | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
5107cf1d | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
5107cf1d UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 RM |
17 | |
18 | #include <sysdep.h> | |
28f540f4 | 19 | |
a7140723 | 20 | #include <jmpbuf-offsets.h> |
8163845f UD |
21 | #define ENV(base,reg) [%base + (reg * 4)] |
22 | #define ST_FLUSH_WINDOWS 3 | |
28f540f4 | 23 | |
f41c8091 | 24 | ENTRY(__longjmp) |
1177c8ba RM |
25 | /* Store our arguments in global registers so we can still |
26 | use them while unwinding frames and their register windows. */ | |
8163845f UD |
27 | |
28 | ld ENV(o0,JB_FP), %g3 /* Cache target FP in register %g3. */ | |
305bb37e UD |
29 | #ifdef PTR_DEMANGLE |
30 | PTR_DEMANGLE (%g3, %g3, %g4) | |
31 | #endif | |
1177c8ba | 32 | mov %o0, %g1 /* ENV in %g1 */ |
350635a5 OB |
33 | orcc %o1, %g0, %g2 /* VAL in %g2 */ |
34 | be,a 0f /* Branch if zero; else skip delay slot. */ | |
f41c8091 | 35 | mov 1, %g2 /* Delay slot only hit if zero: VAL = 1. */ |
1177c8ba | 36 | 0: |
8163845f UD |
37 | xor %fp, %g3, %o0 |
38 | add %fp, 512, %o1 | |
39 | andncc %o0, 4095, %o0 | |
40 | bne LOC(thread) | |
41 | cmp %o1, %g3 | |
42 | bl LOC(thread) | |
1177c8ba RM |
43 | |
44 | /* Now we will loop, unwinding the register windows up the stack | |
f41c8091 | 45 | until the restored %fp value matches the target value in %g3. */ |
1177c8ba | 46 | |
f41c8091 UD |
47 | LOC(loop): |
48 | cmp %fp, %g3 /* Have we reached the target frame? */ | |
49 | bl,a LOC(loop) /* Loop while current fp is below target. */ | |
1177c8ba | 50 | restore /* Unwind register window in delay slot. */ |
f41c8091 | 51 | be,a LOC(found) /* Better have hit it exactly. */ |
8163845f | 52 | ld ENV(g1,JB_SP), %o0 /* Delay slot: extract target SP. */ |
1177c8ba | 53 | |
8163845f | 54 | LOC(thread): |
c0e70b25 | 55 | save %sp, -96, %sp |
8163845f UD |
56 | /* |
57 | * Do a "flush register windows trap". The trap handler in the | |
58 | * kernel writes all the register windows to their stack slots, and | |
59 | * marks them all as invalid (needing to be sucked up from the | |
60 | * stack when used). This ensures that all information needed to | |
61 | * unwind to these callers is in memory, not in the register | |
62 | * windows. | |
63 | */ | |
64 | ta ST_FLUSH_WINDOWS | |
305bb37e UD |
65 | #ifdef PTR_DEMANGLE |
66 | ld ENV(g1,JB_PC), %g5 /* Set return PC. */ | |
67 | ld ENV(g1,JB_SP), %g1 /* Set saved SP on restore below. */ | |
c0e70b25 | 68 | PTR_DEMANGLE2 (%i7, %g5, %g4) |
305bb37e UD |
69 | PTR_DEMANGLE2 (%fp, %g1, %g4) |
70 | #else | |
c0e70b25 | 71 | ld ENV(g1,JB_PC), %i7 /* Set return PC. */ |
8163845f | 72 | ld ENV(g1,JB_SP), %fp /* Set saved SP on restore below. */ |
305bb37e | 73 | #endif |
c0e70b25 | 74 | jmp %i7 + 8 |
8163845f | 75 | restore %g2, 0, %o0 /* Restore values from above register frame. */ |
1177c8ba | 76 | |
f41c8091 UD |
77 | LOC(found): |
78 | /* We have unwound register windows so %fp matches the target. */ | |
305bb37e UD |
79 | #ifdef PTR_DEMANGLE |
80 | PTR_DEMANGLE2 (%sp, %o0, %g4) | |
81 | #else | |
8163845f | 82 | mov %o0, %sp /* OK, install new SP. */ |
305bb37e | 83 | #endif |
1177c8ba | 84 | |
f41c8091 | 85 | LOC(sp_ok): |
8163845f | 86 | ld ENV(g1,JB_PC), %o0 /* Extract target return PC. */ |
305bb37e UD |
87 | #ifdef PTR_DEMANGLE |
88 | PTR_DEMANGLE2 (%o0, %o0, %g4) | |
89 | #endif | |
1177c8ba | 90 | jmp %o0 + 8 /* Return there. */ |
f41c8091 UD |
91 | mov %g2, %o0 /* Delay slot: set return value. */ |
92 | ||
93 | END(__longjmp) |