about summary refs log tree commit diff
path: root/sysdeps/mips/mips64/__longjmp.c
blob: fccb1a9333bed05e9f5999143c2d1189c02ac18a (plain) (blame)
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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
/* Copyright (C) 1992-2021 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>
#include <stdlib.h>

#ifndef	__GNUC__
  #error This file uses GNU C extensions; you must compile with GCC.
#endif

void
__longjmp (__jmp_buf env_arg, int val_arg)
{
  /* gcc 1.39.19 miscompiled the longjmp routine (as it did setjmp before
     the hack around it); force it to use $a1 for the longjmp value.
     Without this it saves $a1 in a register which gets clobbered
     along the way.  */
  register struct __jmp_buf_internal_tag *env asm ("a0");
  register int val asm ("a1");
#ifdef CHECK_SP
  register long long sp asm ("$29");
  CHECK_SP (env[0].__sp, sp, long long);
#endif

#ifdef __mips_hard_float
  /* Pull back the floating point callee-saved registers.  */
#if _MIPS_SIM == _ABI64
  asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[0]));
  asm volatile ("l.d $f25, %0" : : "m" (env[0].__fpregs[1]));
  asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[2]));
  asm volatile ("l.d $f27, %0" : : "m" (env[0].__fpregs[3]));
  asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  asm volatile ("l.d $f29, %0" : : "m" (env[0].__fpregs[5]));
  asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[6]));
  asm volatile ("l.d $f31, %0" : : "m" (env[0].__fpregs[7]));
#else
  asm volatile ("l.d $f20, %0" : : "m" (env[0].__fpregs[0]));
  asm volatile ("l.d $f22, %0" : : "m" (env[0].__fpregs[1]));
  asm volatile ("l.d $f24, %0" : : "m" (env[0].__fpregs[2]));
  asm volatile ("l.d $f26, %0" : : "m" (env[0].__fpregs[3]));
  asm volatile ("l.d $f28, %0" : : "m" (env[0].__fpregs[4]));
  asm volatile ("l.d $f30, %0" : : "m" (env[0].__fpregs[5]));
#endif
#endif

  /* Get the GP. */
  asm volatile ("ld $gp, %0" : : "m" (env[0].__gp));

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

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


  /* Restore the stack pointer and the FP.  They have to be restored
     last and in a single asm as gcc, depending on options used, may
     use either of them to access env.  */
  asm volatile ("ld $29, %0\n\t"
		"ld $30, %1\n\t" : : "m" (env[0].__sp), "m" (env[0].__fp));

/* Give setjmp 1 if given a 0, or what they gave us if non-zero.  */
  if (val == 0)
    asm volatile ("dli $2, 1");
  else
    asm volatile ("move $2, %0" : : "r" (val));

  asm volatile ("j $31");

  /* Avoid `volatile function does return' warnings.  */
  for (;;);
}