gdb/aarch32-linux-nat.c

   1 /* Copyright (C) 1999-2018 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
  30 void
  31 aarch32_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 (regcache, 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 (regcache, ARM_PS_REGNUM, &regs[ARM_CPSR_GREGNUM]);
  44     }
  45   else
  46     regcache_raw_supply (regcache, 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 (regcache, 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
  56 void
  57 aarch32_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_register_status (regcache, regno))
  65         regcache_raw_collect (regcache, regno, &regs[regno]);
  66     }
  67
  68   if (arm_apcs_32
  69       && REG_VALID == regcache_register_status (regcache, ARM_PS_REGNUM))
  70     {
  71       uint32_t cpsr = regs[ARM_CPSR_GREGNUM];
  72
  73       regcache_raw_collect (regcache, ARM_PS_REGNUM,
  74                             &regs[ARM_CPSR_GREGNUM]);
  75       /* Keep reserved bits bit 20 to bit 23.  */
  76       regs[ARM_CPSR_GREGNUM] = ((regs[ARM_CPSR_GREGNUM] & 0xff0fffff)
  77                                 | (cpsr & 0x00f00000));
  78     }
  79 }
  80
  81 /* Supply VFP registers contents, stored in REGS, to REGCACHE.
  82    VFP_REGISTER_COUNT is the number of VFP registers.  */
  83
  84 void
  85 aarch32_vfp_regcache_supply (struct regcache *regcache, gdb_byte *regs,
  86                              const int vfp_register_count)
  87 {
  88   int regno;
  89
  90   for (regno = 0; regno < vfp_register_count; regno++)
  91     regcache_raw_supply (regcache, regno + ARM_D0_REGNUM,
  92                          regs + regno * 8);
  93
  94   regcache_raw_supply (regcache, ARM_FPSCR_REGNUM,
  95                        regs + 32 * 8);
  96 }
  97
  98 /* Collect VFP registers from REGCACHE to buffer REGS.
  99    VFP_REGISTER_COUNT is the number VFP registers.  */
 100
 101 void
 102 aarch32_vfp_regcache_collect (const struct regcache *regcache, gdb_byte *regs,
 103                               const int vfp_register_count)
 104 {
 105   int regno;
 106
 107   for (regno = 0; regno < vfp_register_count; regno++)
 108     regcache_raw_collect (regcache, regno + ARM_D0_REGNUM, regs + regno * 8);
 109
 110   regcache_raw_collect (regcache, ARM_FPSCR_REGNUM, regs + 32 * 8);
 111 }