1 | /* Copyright (C) 1992-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
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. |
8 | |
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 |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library. If not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <setjmp.h> |
19 | #include <stdlib.h> |
20 | |
21 | #ifndef __GNUC__ |
22 | #error This file uses GNU C extensions; you must compile with GCC. |
23 | #endif |
24 | |
25 | static void __attribute__ ((nomips16)) |
26 | ____longjmp (__jmp_buf env_arg, int val_arg) |
27 | { |
28 | /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before |
29 | the hack around it); force it to use $a1 for the longjmp value. |
30 | Without this it saves $a1 in a register which gets clobbered |
31 | along the way. */ |
32 | register struct __jmp_buf_internal_tag *env asm ("a0" ); |
33 | register int val asm ("a1" ); |
34 | #ifdef CHECK_SP |
35 | register long sp asm ("$29" ); |
36 | CHECK_SP (env[0].__sp, sp, long); |
37 | #endif |
38 | |
39 | #ifdef __mips_hard_float |
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 | #endif |
48 | |
49 | /* Get the GP. */ |
50 | asm volatile ("lw $gp, %0" : : "m" (env[0].__gp)); |
51 | |
52 | /* Get the callee-saved registers. */ |
53 | asm volatile ("lw $16, %0" : : "m" (env[0].__regs[0])); |
54 | asm volatile ("lw $17, %0" : : "m" (env[0].__regs[1])); |
55 | asm volatile ("lw $18, %0" : : "m" (env[0].__regs[2])); |
56 | asm volatile ("lw $19, %0" : : "m" (env[0].__regs[3])); |
57 | asm volatile ("lw $20, %0" : : "m" (env[0].__regs[4])); |
58 | asm volatile ("lw $21, %0" : : "m" (env[0].__regs[5])); |
59 | asm volatile ("lw $22, %0" : : "m" (env[0].__regs[6])); |
60 | asm volatile ("lw $23, %0" : : "m" (env[0].__regs[7])); |
61 | |
62 | /* Get the PC. */ |
63 | asm volatile ("lw $25, %0" : : "m" (env[0].__pc)); |
64 | |
65 | /* Restore the stack pointer and the FP. They have to be restored |
66 | last and in a single asm as gcc, depending on options used, may |
67 | use either of them to access env. */ |
68 | asm volatile ("lw $29, %0\n\t" |
69 | "lw $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp)); |
70 | |
71 | /* Give setjmp 1 if given a 0, or what they gave us if non-zero. */ |
72 | if (val == 0) |
73 | asm volatile ("li $2, 1" ); |
74 | else |
75 | asm volatile ("move $2, %0" : : "r" (val)); |
76 | |
77 | asm volatile ("jr $25" ); |
78 | |
79 | /* Avoid `volatile function does return' warnings. */ |
80 | for (;;); |
81 | } |
82 | |
83 | /* Not using strong_alias because the nomips16 attribute cannot be |
84 | copied from ____longjmp to __longjmp, because of the |
85 | architecture-independent declaration of __longjmp without the |
86 | attribute and compiler errors for such attributes not being the |
87 | same on all declarations. */ |
88 | extern __typeof (____longjmp) __longjmp __attribute__ ((alias ("____longjmp" ))); |
89 | |