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
25static 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. */
88extern __typeof (____longjmp) __longjmp __attribute__ ((alias ("____longjmp")));
89

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