aboutsummaryrefslogtreecommitdiff
path: root/gdb/sparc64-linux-tdep.c
blob: 2474575d0eacd1cb0dc6ba891e0a1ea720a6430c (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
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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
/* Target-dependent code for GNU/Linux UltraSPARC.

   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009
   Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program 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 General Public License for more details.

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

#include "defs.h"
#include "frame.h"
#include "frame-unwind.h"
#include "dwarf2-frame.h"
#include "regset.h"
#include "regcache.h"
#include "gdbarch.h"
#include "gdbcore.h"
#include "osabi.h"
#include "solib-svr4.h"
#include "symtab.h"
#include "trad-frame.h"
#include "tramp-frame.h"

#include "sparc64-tdep.h"

/* Signal trampoline support.  */

static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
					 struct frame_info *this_frame,
					 struct trad_frame_cache *this_cache,
					 CORE_ADDR func);

/* See sparc-linux-tdep.c for details.  Note that 64-bit binaries only
   use RT signals.  */

static const struct tramp_frame sparc64_linux_rt_sigframe =
{
  SIGTRAMP_FRAME,
  4,
  {
    { 0x82102065, -1 },		/* mov __NR_rt_sigreturn, %g1 */
    { 0x91d0206d, -1 },		/* ta  0x6d */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  sparc64_linux_sigframe_init
};

static void
sparc64_linux_sigframe_init (const struct tramp_frame *self,
			     struct frame_info *this_frame,
			     struct trad_frame_cache *this_cache,
			     CORE_ADDR func)
{
  CORE_ADDR base, addr, sp_addr;
  int regnum;

  base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM);
  base += 128;

  /* Offsets from <bits/sigcontext.h>.  */

  /* Since %g0 is always zero, keep the identity encoding.  */
  addr = base + 8;
  sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
  for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
    {
      trad_frame_set_reg_addr (this_cache, regnum, addr);
      addr += 8;
    }

  trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
  trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
  trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
  trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
  trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);

  base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
  if (base & 1)
    base += BIAS;

  addr = get_frame_memory_unsigned (this_frame, sp_addr, 8);
  if (addr & 1)
    addr += BIAS;

  for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
    {
      trad_frame_set_reg_addr (this_cache, regnum, addr);
      addr += 8;
    }
  trad_frame_set_id (this_cache, frame_id_build (base, func));
}

/* Return the address of a system call's alternative return
   address.  */

static CORE_ADDR
sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)
{
  if (insn == 0x91d0206d)
    {
      ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);
      if (sp & 1)
	sp += BIAS;

      /* The kernel puts the sigreturn registers on the stack,
	 and this is where the signal unwinding state is take from
	 when returning from a signal.

	 A siginfo_t sits 192 bytes from the base of the stack.  This
	 siginfo_t is 128 bytes, and is followed by the sigreturn
	 register save area.  The saved PC sits at a 136 byte offset
	 into there.  */

      return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8);
    }

  return 0;
}


const struct sparc_gregset sparc64_linux_core_gregset =
{
  32 * 8,			/* %tstate */
  33 * 8,			/* %tpc */
  34 * 8,			/* %tnpc */
  35 * 8,			/* %y */
  -1,				/* %wim */
  -1,				/* %tbr */
  1 * 8,			/* %g1 */
  16 * 8,			/* %l0 */
  8,				/* y size */
};


static void
sparc64_linux_supply_core_gregset (const struct regset *regset,
				   struct regcache *regcache,
				   int regnum, const void *gregs, size_t len)
{
  sparc64_supply_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
}

static void
sparc64_linux_collect_core_gregset (const struct regset *regset,
				    const struct regcache *regcache,
				    int regnum, void *gregs, size_t len)
{
  sparc64_collect_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
}

static void
sparc64_linux_supply_core_fpregset (const struct regset *regset,
				    struct regcache *regcache,
				    int regnum, const void *fpregs, size_t len)
{
  sparc64_supply_fpregset (regcache, regnum, fpregs);
}

static void
sparc64_linux_collect_core_fpregset (const struct regset *regset,
				     const struct regcache *regcache,
				     int regnum, void *fpregs, size_t len)
{
  sparc64_collect_fpregset (regcache, regnum, fpregs);
}

/* Set the program counter for process PTID to PC.  */

#define TSTATE_SYSCALL	0x0000000000000020ULL

static void
sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
  ULONGEST state;

  regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
  regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4);

  /* Clear the "in syscall" bit to prevent the kernel from
     messing with the PCs we just installed, if we happen to be
     within an interrupted system call that the kernel wants to
     restart.

     Note that after we return from the dummy call, the TSTATE et al.
     registers will be automatically restored, and the kernel
     continues to restart the system call at this point.  */
  regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state);
  state &= ~TSTATE_SYSCALL;
  regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state);
}



static void
sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset,
				sparc64_linux_collect_core_gregset);
  tdep->sizeof_gregset = 288;

  tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset,
				 sparc64_linux_collect_core_fpregset);
  tdep->sizeof_fpregset = 280;

  tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);

  /* Hook in the DWARF CFI frame unwinder.  */
  dwarf2_append_unwinders (gdbarch);

  sparc64_init_abi (info, gdbarch);

  /* GNU/Linux has SVR4-style shared libraries...  */
  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
  set_solib_svr4_fetch_link_map_offsets
    (gdbarch, svr4_lp64_fetch_link_map_offsets);

  /* ...which means that we need some special handling when doing
     prologue analysis.  */
  tdep->plt_entry_size = 16;

  /* Enable TLS support.  */
  set_gdbarch_fetch_tls_load_module_address (gdbarch,
                                             svr4_fetch_objfile_link_map);

  /* Make sure we can single-step over signal return system calls.  */
  tdep->step_trap = sparc64_linux_step_trap;

  set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc);
}


/* Provide a prototype to silence -Wmissing-prototypes.  */
extern void _initialize_sparc64_linux_tdep (void);

void
_initialize_sparc64_linux_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
			  GDB_OSABI_LINUX, sparc64_linux_init_abi);
}