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1 | /* Copyright (C) 2011-2015 Free Software Foundation, Inc. | |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011. | |
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 | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <sysdep.h> | |
20 | #include <jmpbuf-offsets.h> | |
21 | #include <asm-syntax.h> | |
22 | #include <arch/spr_def.h> | |
23 | ||
24 | /* PL to return to via iret in longjmp */ | |
25 | #define RETURN_PL 0 | |
26 | ||
27 | .text | |
28 | ENTRY (__longjmp) | |
29 | FEEDBACK_ENTER(__longjmp) | |
30 | ||
31 | #define RESTORE(r) { LD r, r0 ; ADDI_PTR r0, r0, REGSIZE } | |
32 | FOR_EACH_CALLEE_SAVED_REG(RESTORE) | |
33 | ||
34 | /* Make longjmp(buf, 0) return "1" instead. | |
35 | At the same time, construct our iret context; we set ICS so | |
36 | we can validly load EX_CONTEXT for iret without being | |
37 | interrupted halfway through. */ | |
38 | { | |
39 | LD r2, r0 /* retrieve ICS bit from jmp_buf */ | |
40 | movei r3, 1 | |
41 | CMPEQI r0, r1, 0 | |
42 | } | |
43 | { | |
44 | mtspr INTERRUPT_CRITICAL_SECTION, r3 | |
45 | shli r2, r2, SPR_EX_CONTEXT_0_1__ICS_SHIFT | |
46 | } | |
47 | { | |
48 | mtspr EX_CONTEXT_0_0, lr | |
49 | ori r2, r2, RETURN_PL | |
50 | } | |
51 | { | |
52 | or r0, r1, r0 | |
53 | mtspr EX_CONTEXT_0_1, r2 | |
54 | } | |
55 | iret | |
56 | jrp lr /* Keep the backtracer happy. */ | |
57 | END (__longjmp) |