1/* Copyright (C) 1992-2024 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 <sgidefs.h>
20#include <stdlib.h>
21
22#ifndef __GNUC__
23 #error This file uses GNU C extensions; you must compile with GCC.
24#endif
25
26void
27__longjmp (__jmp_buf env_arg, int val_arg)
28{
29 /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
30 the hack around it); force it to use $a1 for the longjmp value.
31 Without this it saves $a1 in a register which gets clobbered
32 along the way. */
33 register struct __jmp_buf_internal_tag *env asm ("a0");
34 register int val asm ("a1");
35#ifdef CHECK_SP
36 register long long sp asm ("$29");
37 CHECK_SP (env[0].__sp, sp, long long);
38#endif
39
40#ifdef __mips_hard_float
41 /* Pull back the floating point callee-saved registers. */
42#if _MIPS_SIM == _ABI64
43 asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[0]));
44 asm volatile ("l.d $f25, %0" : : "m" (env[0].__fpregs[1]));
45 asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[2]));
46 asm volatile ("l.d $f27, %0" : : "m" (env[0].__fpregs[3]));
47 asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
48 asm volatile ("l.d $f29, %0" : : "m" (env[0].__fpregs[5]));
49 asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[6]));
50 asm volatile ("l.d $f31, %0" : : "m" (env[0].__fpregs[7]));
51#else
52 asm volatile ("l.d $f20, %0" : : "m" (env[0].__fpregs[0]));
53 asm volatile ("l.d $f22, %0" : : "m" (env[0].__fpregs[1]));
54 asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[2]));
55 asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[3]));
56 asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
57 asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[5]));
58#endif
59#endif
60
61 /* Get the GP. */
62 asm volatile ("ld $gp, %0" : : "m" (env[0].__gp));
63
64 /* Get the callee-saved registers. */
65 asm volatile ("ld $16, %0" : : "m" (env[0].__regs[0]));
66 asm volatile ("ld $17, %0" : : "m" (env[0].__regs[1]));
67 asm volatile ("ld $18, %0" : : "m" (env[0].__regs[2]));
68 asm volatile ("ld $19, %0" : : "m" (env[0].__regs[3]));
69 asm volatile ("ld $20, %0" : : "m" (env[0].__regs[4]));
70 asm volatile ("ld $21, %0" : : "m" (env[0].__regs[5]));
71 asm volatile ("ld $22, %0" : : "m" (env[0].__regs[6]));
72 asm volatile ("ld $23, %0" : : "m" (env[0].__regs[7]));
73
74 /* Get the PC. */
75 asm volatile ("ld $31, %0" : : "m" (env[0].__pc));
76
77
78 /* Restore the stack pointer and the FP. They have to be restored
79 last and in a single asm as gcc, depending on options used, may
80 use either of them to access env. */
81 asm volatile ("ld $29, %0\n\t"
82 "ld $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp));
83
84/* Give setjmp 1 if given a 0, or what they gave us if non-zero. */
85 if (val == 0)
86 asm volatile ("dli $2, 1");
87 else
88 asm volatile ("move $2, %0" : : "r" (val));
89
90 asm volatile ("j $31");
91
92 /* Avoid `volatile function does return' warnings. */
93 for (;;);
94}
95

source code of glibc/sysdeps/mips/mips64/__longjmp.c