1/* Copyright (C) 1996-2024 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
21/* This function is only called via the assembly language routine
22 __sigsetjmp, which arranges to pass in the stack pointer and the frame
23 pointer. We do things this way because it's difficult to reliably
24 access them in C. */
25
26/* Stack protection is disabled to avoid changing s0 (or any other
27 caller-save register) before storing it to environment.
28 See BZ #22624. */
29
30int
31inhibit_stack_protector
32__sigsetjmp_aux (jmp_buf env, int savemask, long long sp, long long fp,
33 long long gp)
34{
35#ifdef __mips_hard_float
36 /* Store the floating point callee-saved registers... */
37#if _MIPS_SIM == _ABI64
38 asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
39 asm volatile ("s.d $f25, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
40 asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
41 asm volatile ("s.d $f27, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
42 asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
43 asm volatile ("s.d $f29, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
44 asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[6]));
45 asm volatile ("s.d $f31, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[7]));
46#else
47 asm volatile ("s.d $f20, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
48 asm volatile ("s.d $f22, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
49 asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
50 asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
51 asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
52 asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
53#endif
54#endif
55
56 /* .. and the PC; */
57 asm volatile ("sd $31, %0" : : "m" (env[0].__jmpbuf[0].__pc));
58
59 /* .. and the stack pointer; */
60 env[0].__jmpbuf[0].__sp = sp;
61
62 /* .. and the FP; it'll be in s8. */
63 env[0].__jmpbuf[0].__fp = fp;
64
65 /* .. and the GP; */
66 env[0].__jmpbuf[0].__gp = gp;
67
68 /* .. and the callee-saved registers; */
69 asm volatile ("sd $16, %0" : : "m" (env[0].__jmpbuf[0].__regs[0]));
70 asm volatile ("sd $17, %0" : : "m" (env[0].__jmpbuf[0].__regs[1]));
71 asm volatile ("sd $18, %0" : : "m" (env[0].__jmpbuf[0].__regs[2]));
72 asm volatile ("sd $19, %0" : : "m" (env[0].__jmpbuf[0].__regs[3]));
73 asm volatile ("sd $20, %0" : : "m" (env[0].__jmpbuf[0].__regs[4]));
74 asm volatile ("sd $21, %0" : : "m" (env[0].__jmpbuf[0].__regs[5]));
75 asm volatile ("sd $22, %0" : : "m" (env[0].__jmpbuf[0].__regs[6]));
76 asm volatile ("sd $23, %0" : : "m" (env[0].__jmpbuf[0].__regs[7]));
77
78 /* Save the signal mask if requested. */
79 return __sigjmp_save (env: env, savemask: savemask);
80}
81

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