summaryrefslogtreecommitdiff
path: root/sysdeps/mips/mips64/setjmp_aux.c
blob: 7dea2092f84f1944e24841b18a3e82487b81b17f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
/* Copyright (C) 1996-2020 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Brendan Kehoe (brendan@zen.org).

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <https://www.gnu.org/licenses/>.  */

#include <setjmp.h>
#include <sgidefs.h>

/* This function is only called via the assembly language routine
   __sigsetjmp, which arranges to pass in the stack pointer and the frame
   pointer.  We do things this way because it's difficult to reliably
   access them in C.  */

/* Stack protection is disabled to avoid changing s0 (or any other
   caller-save register) before storing it to environment.
   See BZ #22624.  */

int
inhibit_stack_protector
__sigsetjmp_aux (jmp_buf env, int savemask, long long sp, long long fp,
		 long long gp)
{
#ifdef __mips_hard_float
  /* Store the floating point callee-saved registers...  */
#if _MIPS_SIM == _ABI64
  asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
  asm volatile ("s.d $f25, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
  asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
  asm volatile ("s.d $f27, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
  asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
  asm volatile ("s.d $f29, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
  asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[6]));
  asm volatile ("s.d $f31, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[7]));
#else
  asm volatile ("s.d $f20, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[0]));
  asm volatile ("s.d $f22, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[1]));
  asm volatile ("s.d $f24, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[2]));
  asm volatile ("s.d $f26, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[3]));
  asm volatile ("s.d $f28, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[4]));
  asm volatile ("s.d $f30, %0" : : "m" (env[0].__jmpbuf[0].__fpregs[5]));
#endif
#endif

  /* .. and the PC;  */
  asm volatile ("sd $31, %0" : : "m" (env[0].__jmpbuf[0].__pc));

  /* .. and the stack pointer;  */
  env[0].__jmpbuf[0].__sp = sp;

  /* .. and the FP; it'll be in s8. */
  env[0].__jmpbuf[0].__fp = fp;

  /* .. and the GP; */
  env[0].__jmpbuf[0].__gp = gp;

  /* .. and the callee-saved registers; */
  asm volatile ("sd $16, %0" : : "m" (env[0].__jmpbuf[0].__regs[0]));
  asm volatile ("sd $17, %0" : : "m" (env[0].__jmpbuf[0].__regs[1]));
  asm volatile ("sd $18, %0" : : "m" (env[0].__jmpbuf[0].__regs[2]));
  asm volatile ("sd $19, %0" : : "m" (env[0].__jmpbuf[0].__regs[3]));
  asm volatile ("sd $20, %0" : : "m" (env[0].__jmpbuf[0].__regs[4]));
  asm volatile ("sd $21, %0" : : "m" (env[0].__jmpbuf[0].__regs[5]));
  asm volatile ("sd $22, %0" : : "m" (env[0].__jmpbuf[0].__regs[6]));
  asm volatile ("sd $23, %0" : : "m" (env[0].__jmpbuf[0].__regs[7]));

  /* Save the signal mask if requested.  */
  return __sigjmp_save (env, savemask);
}