aarch32-linux-nat.c revision 1.1.1.3 
1/* Copyright (C) 1999-2019 Free Software Foundation, Inc.
2
3   This file is part of GDB.
4
5   This program is free software; you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#include "defs.h"
19
20#include "regcache.h"
21#include "arm-tdep.h"
22#include "arm-linux-tdep.h"
23#include "arch/arm-linux.h"
24
25#include "aarch32-linux-nat.h"
26
27/* Supply GP registers contents, stored in REGS, to REGCACHE.  ARM_APCS_32
28   is true if the 32-bit mode is in use, otherwise, it is false.  */
29
30void
31aarch32_gp_regcache_supply (struct regcache *regcache, uint32_t *regs,
32			    int arm_apcs_32)
33{
34  int regno;
35
36  for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
37    regcache->raw_supply (regno, &regs[regno]);
38
39  if (arm_apcs_32)
40    {
41      /* Clear reserved bits bit 20 to bit 23.  */
42      regs[ARM_CPSR_GREGNUM] &= 0xff0fffff;
43      regcache->raw_supply (ARM_PS_REGNUM, &regs[ARM_CPSR_GREGNUM]);
44    }
45  else
46    regcache->raw_supply (ARM_PS_REGNUM, &regs[ARM_PC_REGNUM]);
47
48  regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove
49			  (regcache->arch (), regs[ARM_PC_REGNUM]);
50  regcache->raw_supply (ARM_PC_REGNUM, &regs[ARM_PC_REGNUM]);
51}
52
53/* Collect GP registers from REGCACHE to buffer REGS.  ARM_APCS_32 is
54   true if the 32-bit mode is in use, otherwise, it is false.  */
55
56void
57aarch32_gp_regcache_collect (const struct regcache *regcache, uint32_t *regs,
58			     int arm_apcs_32)
59{
60  int regno;
61
62  for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++)
63    {
64      if (REG_VALID == regcache->get_register_status (regno))
65	regcache->raw_collect (regno, &regs[regno]);
66    }
67
68  if (arm_apcs_32
69      && REG_VALID == regcache->get_register_status (ARM_PS_REGNUM))
70    {
71      uint32_t cpsr = regs[ARM_CPSR_GREGNUM];
72
73      regcache->raw_collect (ARM_PS_REGNUM, &regs[ARM_CPSR_GREGNUM]);
74      /* Keep reserved bits bit 20 to bit 23.  */
75      regs[ARM_CPSR_GREGNUM] = ((regs[ARM_CPSR_GREGNUM] & 0xff0fffff)
76				| (cpsr & 0x00f00000));
77    }
78}
79
80/* Supply VFP registers contents, stored in REGS, to REGCACHE.
81   VFP_REGISTER_COUNT is the number of VFP registers.  */
82
83void
84aarch32_vfp_regcache_supply (struct regcache *regcache, gdb_byte *regs,
85			     const int vfp_register_count)
86{
87  int regno;
88
89  for (regno = 0; regno < vfp_register_count; regno++)
90    regcache->raw_supply (regno + ARM_D0_REGNUM, regs + regno * 8);
91
92  regcache->raw_supply (ARM_FPSCR_REGNUM, regs + 32 * 8);
93}
94
95/* Collect VFP registers from REGCACHE to buffer REGS.
96   VFP_REGISTER_COUNT is the number VFP registers.  */
97
98void
99aarch32_vfp_regcache_collect (const struct regcache *regcache, gdb_byte *regs,
100			      const int vfp_register_count)
101{
102  int regno;
103
104  for (regno = 0; regno < vfp_register_count; regno++)
105    regcache->raw_collect (regno + ARM_D0_REGNUM, regs + regno * 8);
106
107  regcache->raw_collect (ARM_FPSCR_REGNUM, regs + 32 * 8);
108}
109