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1 | /* Copyright (C) 1992, 1995, 1997, 2000 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. | |
3 | Contributed by Brendan Kehoe (brendan@zen.org). | |
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, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <setjmp.h> | |
21 | #include <stdlib.h> | |
22 | ||
23 | #undef __longjmp | |
24 | ||
25 | #ifndef __GNUC__ | |
26 | #error This file uses GNU C extensions; you must compile with GCC. | |
27 | #endif | |
28 | ||
29 | void | |
30 | __longjmp (env, val_arg) | |
31 | __jmp_buf env; | |
32 | int val_arg; | |
33 | { | |
34 | /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before | |
35 | the hack around it); force it to use $a1 for the longjmp value. | |
36 | Without this it saves $a1 in a register which gets clobbered | |
37 | along the way. */ | |
38 | register int val asm ("a1"); | |
39 | ||
40 | /* Pull back the floating point callee-saved registers. */ | |
41 | asm volatile ("l.d $f20, %0" : : "m" (env[0].__fpregs[0])); | |
42 | asm volatile ("l.d $f22, %0" : : "m" (env[0].__fpregs[1])); | |
43 | asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[2])); | |
44 | asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[3])); | |
45 | asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4])); | |
46 | asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[5])); | |
47 | ||
48 | /* Get and reconstruct the floating point csr. */ | |
49 | asm volatile ("lw $2, %0" : : "m" (env[0].__fpc_csr)); | |
50 | asm volatile ("ctc1 $2, $31"); | |
51 | ||
52 | /* Get the GP. */ | |
53 | asm volatile ("lw $gp, %0" : : "m" (env[0].__gp)); | |
54 | ||
55 | /* Get the callee-saved registers. */ | |
56 | asm volatile ("lw $16, %0" : : "m" (env[0].__regs[0])); | |
57 | asm volatile ("lw $17, %0" : : "m" (env[0].__regs[1])); | |
58 | asm volatile ("lw $18, %0" : : "m" (env[0].__regs[2])); | |
59 | asm volatile ("lw $19, %0" : : "m" (env[0].__regs[3])); | |
60 | asm volatile ("lw $20, %0" : : "m" (env[0].__regs[4])); | |
61 | asm volatile ("lw $21, %0" : : "m" (env[0].__regs[5])); | |
62 | asm volatile ("lw $22, %0" : : "m" (env[0].__regs[6])); | |
63 | asm volatile ("lw $23, %0" : : "m" (env[0].__regs[7])); | |
64 | ||
65 | /* Get the PC. */ | |
66 | asm volatile ("lw $25, %0" : : "m" (env[0].__pc)); | |
67 | ||
68 | /* Restore the stack pointer and the FP. They have to be restored | |
69 | last and in a single asm as gcc, depending on options used, may | |
70 | use either of them to access env. */ | |
71 | asm volatile ("lw $29, %0\n\t" | |
72 | "lw $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp)); | |
73 | ||
74 | /* Give setjmp 1 if given a 0, or what they gave us if non-zero. */ | |
75 | if (val == 0) | |
76 | asm volatile ("li $2, 1"); | |
77 | else | |
78 | asm volatile ("move $2, %0" : : "r" (val)); | |
79 | ||
80 | asm volatile ("jr $25"); | |
81 | ||
82 | /* Avoid `volatile function does return' warnings. */ | |
83 | for (;;); | |
84 | } |