about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/m68k/register-dump.h
blob: c0cc7f6156c0a8d94df5e6a3fd73f3919527805e (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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
/* Dump registers.
   Copyright (C) 1998-2018 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Andreas Schwab <schwab@gnu.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
   <http://www.gnu.org/licenses/>.  */

#include <stddef.h>
#include <sys/uio.h>
#include <_itoa.h>

/* We will print the register dump in this format:

  D0: XXXXXXXX   D1: XXXXXXXX   D2: XXXXXXXX   D3: XXXXXXXX
  D4: XXXXXXXX   D5: XXXXXXXX   D6: XXXXXXXX   D7: XXXXXXXX
  A0: XXXXXXXX   A1: XXXXXXXX   A2: XXXXXXXX   A3: XXXXXXXX
  A4: XXXXXXXX   A5: XXXXXXXX   A6: XXXXXXXX   A7: XXXXXXXX
  PC: XXXXXXXX   SR: XXXX

  OldMask: XXXXXXXX  Vector: XXXX

  FP0: XXXXXXXXXXXXXXXXXXXXXXXX   FP1: XXXXXXXXXXXXXXXXXXXXXXXX
  FP2: XXXXXXXXXXXXXXXXXXXXXXXX   FP3: XXXXXXXXXXXXXXXXXXXXXXXX
  FP4: XXXXXXXXXXXXXXXXXXXXXXXX   FP5: XXXXXXXXXXXXXXXXXXXXXXXX
  FP6: XXXXXXXXXXXXXXXXXXXXXXXX   FP7: XXXXXXXXXXXXXXXXXXXXXXXX
  FPCR: XXXXXXXX   FPSR: XXXXXXXX   FPIAR: XXXXXXXX

*/

/* Linux saves only the call-clobbered registers in the sigcontext.  We
   need to use a trampoline that saves the rest so that the C code can
   access them.  We use the sc_fpstate field, since the handler is not
   supposed to return anyway, thus it doesn't matter that it's clobbered.  */

/* static */ void catch_segfault (int, int, struct sigcontext *);

/* Dummy function so that we can use asm with arguments.  */
static void __attribute_used__
__dummy__ (void)
{
  asm ("\n\
catch_segfault:\n\
	move.l 12(%%sp),%%a0\n\
	lea %c0(%%a0),%%a0\n\
	/* Clear the first 4 bytes to make it a null fp state, just\n\
	   in case the handler does return.  */\n\
	clr.l (%%a0)+\n\
	movem.l %%d2-%%d7/%%a2-%%a6,(%%a0)\n"
#ifndef __mcoldfire__
       "fmovem.x %%fp2-%%fp7,11*4(%%a0)\n"
#elif defined __mcffpu__
       "fmovem.d %%fp2-%%fp7,11*4(%%a0)\n"
#endif
       "jra real_catch_segfault"
       : : "n" (offsetof (struct sigcontext, sc_fpstate)));
}
#define catch_segfault(a,b) \
  __attribute_used__ real_catch_segfault(a,b)

static void
hexvalue (unsigned long int value, char *buf, size_t len)
{
  char *cp = _itoa_word (value, buf + len, 16, 0);
  while (cp > buf)
    *--cp = '0';
}

static void
register_dump (int fd, struct sigcontext *ctx)
{
  char regs[20][8];
  char fpregs[11][24];
  struct iovec iov[63], *next_iov = iov;
  unsigned long *p = (unsigned long *) ctx->sc_fpstate + 1;
  unsigned long *pfp = (unsigned long *) ctx->sc_fpregs;
  int i, j, fpreg_size;

#define ADD_STRING(str) \
  next_iov->iov_base = (char *) (str); \
  next_iov->iov_len = strlen (str); \
  ++next_iov
#define ADD_MEM(str, len) \
  next_iov->iov_base = (str); \
  next_iov->iov_len = (len); \
  ++next_iov

#ifdef __mcoldfire__
  fpreg_size = 16;
#else
  fpreg_size = 24;
#endif

  /* Generate strings of register contents.  */
  hexvalue (ctx->sc_d0, regs[0], 8);
  hexvalue (ctx->sc_d1, regs[1], 8);
  hexvalue (*p++, regs[2], 8);
  hexvalue (*p++, regs[3], 8);
  hexvalue (*p++, regs[4], 8);
  hexvalue (*p++, regs[5], 8);
  hexvalue (*p++, regs[6], 8);
  hexvalue (*p++, regs[7], 8);
  hexvalue (ctx->sc_a0, regs[8], 8);
  hexvalue (ctx->sc_a1, regs[9], 8);
  hexvalue (*p++, regs[10], 8);
  hexvalue (*p++, regs[11], 8);
  hexvalue (*p++, regs[12], 8);
  hexvalue (*p++, regs[13], 8);
  hexvalue (*p++, regs[14], 8);
  hexvalue (ctx->sc_usp, regs[15], 8);
  hexvalue (ctx->sc_pc, regs[16], 8);
  hexvalue (ctx->sc_sr, regs[17], 4);
  hexvalue (ctx->sc_mask, regs[18], 8);
  hexvalue (ctx->sc_formatvec & 0xfff, regs[19], 4);
  for (i = 0; i < 2; i++)
    for (j = 0; j < fpreg_size; j += 8)
      hexvalue (*pfp++, fpregs[i] + j, 8);
  for (i = 2; i < 8; i++)
    for (j = 0; j < fpreg_size; j += 8)
      hexvalue (*p++, fpregs[i] + j, 8);
  hexvalue (ctx->sc_fpcntl[0], fpregs[8], 8);
  hexvalue (ctx->sc_fpcntl[1], fpregs[9], 8);
  hexvalue (ctx->sc_fpcntl[2], fpregs[10], 8);

  /* Generate the output.  */
  ADD_STRING ("Register dump:\n\n  D0: ");
  ADD_MEM (regs[0], 8);
  ADD_STRING ("  D1: ");
  ADD_MEM (regs[1], 8);
  ADD_STRING ("  D2: ");
  ADD_MEM (regs[2], 8);
  ADD_STRING ("  D3: ");
  ADD_MEM (regs[3], 8);
  ADD_STRING ("\n  D4: ");
  ADD_MEM (regs[4], 8);
  ADD_STRING ("  D5: ");
  ADD_MEM (regs[5], 8);
  ADD_STRING ("  D6: ");
  ADD_MEM (regs[6], 8);
  ADD_STRING ("  D7: ");
  ADD_MEM (regs[7], 8);
  ADD_STRING ("\n  A0: ");
  ADD_MEM (regs[8], 8);
  ADD_STRING ("  A1: ");
  ADD_MEM (regs[9], 8);
  ADD_STRING ("  A2: ");
  ADD_MEM (regs[10], 8);
  ADD_STRING ("  A3: ");
  ADD_MEM (regs[11], 8);
  ADD_STRING ("\n  A4: ");
  ADD_MEM (regs[12], 8);
  ADD_STRING ("  A5: ");
  ADD_MEM (regs[13], 8);
  ADD_STRING ("  A6: ");
  ADD_MEM (regs[14], 8);
  ADD_STRING ("  A7: ");
  ADD_MEM (regs[15], 8);
  ADD_STRING ("\n  PC: ");
  ADD_MEM (regs[16], 8);
  ADD_STRING ("  SR: ");
  ADD_MEM (regs[17], 4);

  ADD_STRING ("\n\n  OldMask: ");
  ADD_MEM (regs[18], 8);
  ADD_STRING ("  Vector: ");
  ADD_MEM (regs[19], 4);

  ADD_STRING ("\n\n  FP0: ");
  ADD_MEM (fpregs[0], fpreg_size);
  ADD_STRING ("  FP1: ");
  ADD_MEM (fpregs[1], fpreg_size);
  ADD_STRING ("\n  FP2: ");
  ADD_MEM (fpregs[2], fpreg_size);
  ADD_STRING ("  FP3: ");
  ADD_MEM (fpregs[3], fpreg_size);
  ADD_STRING ("\n  FP4: ");
  ADD_MEM (fpregs[4], fpreg_size);
  ADD_STRING ("  FP5: ");
  ADD_MEM (fpregs[5], fpreg_size);
  ADD_STRING ("\n  FP6: ");
  ADD_MEM (fpregs[6], fpreg_size);
  ADD_STRING ("  FP7: ");
  ADD_MEM (fpregs[7], fpreg_size);
  ADD_STRING ("\n  FPCR: ");
  ADD_MEM (fpregs[8], 8);
  ADD_STRING ("  FPSR: ");
  ADD_MEM (fpregs[9], 8);
  ADD_STRING ("  FPIAR: ");
  ADD_MEM (fpregs[10], 8);
  ADD_STRING ("\n");

  /* Write the stuff out.  */
  writev (fd, iov, next_iov - iov);
}

#define REGISTER_DUMP register_dump (fd, ctx)