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[glibc.git] / sysdeps / mips / setjmp_aux.c
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1 /* Copyright (C) 1996-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
18 #include <setjmp.h>
20 /* This function is only called via the assembly language routine
21 __sigsetjmp, which arranges to pass in the stack pointer and the frame
22 pointer. We do things this way because it's difficult to reliably
23 access them in C. */
25 /* Stack protection is disabled to avoid changing s0 (or any other
26 caller-save register) before storing it to environment.
27 See BZ #22624. */
29 int __attribute__ ((nomips16))
30 inhibit_stack_protector
31 __sigsetjmp_aux (jmp_buf env, int savemask, int sp, int fp)
33 #ifdef __mips_hard_float
34 /* Store the floating point callee-saved registers... */
35 asm volatile ("s.d $f20, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
36 asm volatile ("s.d $f22, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
37 asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
38 asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
39 asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
40 asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
41 #endif
43 /* .. and the PC; */
44 asm volatile ("sw $31, %0" : : "m" (env[0].__jmpbuf[0].__pc));
46 /* .. and the stack pointer; */
47 env[0].__jmpbuf[0].__sp = (void *) sp;
49 /* .. and the FP; it'll be in s8. */
50 env[0].__jmpbuf[0].__fp = (void *) fp;
52 /* .. and the GP; */
53 asm volatile ("sw $gp, %0" : : "m" (env[0].__jmpbuf[0].__gp));
55 /* .. and the callee-saved registers; */
56 asm volatile ("sw $16, %0" : : "m" (env[0].__jmpbuf[0].__regs[0]));
57 asm volatile ("sw $17, %0" : : "m" (env[0].__jmpbuf[0].__regs[1]));
58 asm volatile ("sw $18, %0" : : "m" (env[0].__jmpbuf[0].__regs[2]));
59 asm volatile ("sw $19, %0" : : "m" (env[0].__jmpbuf[0].__regs[3]));
60 asm volatile ("sw $20, %0" : : "m" (env[0].__jmpbuf[0].__regs[4]));
61 asm volatile ("sw $21, %0" : : "m" (env[0].__jmpbuf[0].__regs[5]));
62 asm volatile ("sw $22, %0" : : "m" (env[0].__jmpbuf[0].__regs[6]));
63 asm volatile ("sw $23, %0" : : "m" (env[0].__jmpbuf[0].__regs[7]));
65 /* Save the signal mask if requested. */
66 return __sigjmp_save (env, savemask);