gdbserver/lynx-ppc-low.cc

   1 /* Copyright (C) 2009-2020 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 "server.h"
  19 #include "lynx-low.h"
  20 #include <limits.h>
  21 #include <sys/ptrace.h>
  22
  23 /* The following two typedefs are defined in a .h file which is not
  24    in the standard include path (/sys/include/family/ppc/ucontext.h),
  25    so we just duplicate them here.  */
  26
  27 /* General register context */
  28 typedef struct usr_econtext_s
  29 {
  30         uint32_t        uec_iregs[32];
  31         uint32_t        uec_inum;
  32         uint32_t        uec_srr0;
  33         uint32_t        uec_srr1;
  34         uint32_t        uec_lr;
  35         uint32_t        uec_ctr;
  36         uint32_t        uec_cr;
  37         uint32_t        uec_xer;
  38         uint32_t        uec_dar;
  39         uint32_t        uec_mq;
  40         uint32_t        uec_msr;
  41         uint32_t        uec_sregs[16];
  42         uint32_t        uec_ss_count;
  43         uint32_t        uec_ss_addr1;
  44         uint32_t        uec_ss_addr2;
  45         uint32_t        uec_ss_code1;
  46         uint32_t        uec_ss_code2;
  47 } usr_econtext_t;
  48
  49 /* Floating point register context */
  50 typedef struct usr_fcontext_s
  51 {
  52         uint64_t        ufc_freg[32];
  53         uint32_t        ufc_fpscr[2];
  54 } usr_fcontext_t;
  55
  56 /* Index of for various registers inside the regcache.  */
  57 #define R0_REGNUM    0
  58 #define F0_REGNUM    32
  59 #define PC_REGNUM    64
  60 #define MSR_REGNUM   65
  61 #define CR_REGNUM    66
  62 #define LR_REGNUM    67
  63 #define CTR_REGNUM   68
  64 #define XER_REGNUM   69
  65 #define FPSCR_REGNUM 70
  66
  67 /* Defined in auto-generated file powerpc-32.c.  */
  68 extern void init_registers_powerpc_32 (void);
  69 extern const struct target_desc *tdesc_powerpc_32;
  70
  71 /* The fill_function for the general-purpose register set.  */
  72
  73 static void
  74 lynx_ppc_fill_gregset (struct regcache *regcache, char *buf)
  75 {
  76   int i;
  77
  78   /* r0 - r31 */
  79   for (i = 0; i < 32; i++)
  80     collect_register (regcache, R0_REGNUM + i,
  81                       buf + offsetof (usr_econtext_t, uec_iregs[i]));
  82
  83   /* The other registers provided in the GP register context.  */
  84   collect_register (regcache, PC_REGNUM,
  85                     buf + offsetof (usr_econtext_t, uec_srr0));
  86   collect_register (regcache, MSR_REGNUM,
  87                     buf + offsetof (usr_econtext_t, uec_srr1));
  88   collect_register (regcache, CR_REGNUM,
  89                     buf + offsetof (usr_econtext_t, uec_cr));
  90   collect_register (regcache, LR_REGNUM,
  91                     buf + offsetof (usr_econtext_t, uec_lr));
  92   collect_register (regcache, CTR_REGNUM,
  93                     buf + offsetof (usr_econtext_t, uec_ctr));
  94   collect_register (regcache, XER_REGNUM,
  95                     buf + offsetof (usr_econtext_t, uec_xer));
  96 }
  97
  98 /* The store_function for the general-purpose register set.  */
  99
 100 static void
 101 lynx_ppc_store_gregset (struct regcache *regcache, const char *buf)
 102 {
 103   int i;
 104
 105   /* r0 - r31 */
 106   for (i = 0; i < 32; i++)
 107     supply_register (regcache, R0_REGNUM + i,
 108                       buf + offsetof (usr_econtext_t, uec_iregs[i]));
 109
 110   /* The other registers provided in the GP register context.  */
 111   supply_register (regcache, PC_REGNUM,
 112                    buf + offsetof (usr_econtext_t, uec_srr0));
 113   supply_register (regcache, MSR_REGNUM,
 114                    buf + offsetof (usr_econtext_t, uec_srr1));
 115   supply_register (regcache, CR_REGNUM,
 116                    buf + offsetof (usr_econtext_t, uec_cr));
 117   supply_register (regcache, LR_REGNUM,
 118                    buf + offsetof (usr_econtext_t, uec_lr));
 119   supply_register (regcache, CTR_REGNUM,
 120                    buf + offsetof (usr_econtext_t, uec_ctr));
 121   supply_register (regcache, XER_REGNUM,
 122                    buf + offsetof (usr_econtext_t, uec_xer));
 123 }
 124
 125 /* The fill_function for the floating-point register set.  */
 126
 127 static void
 128 lynx_ppc_fill_fpregset (struct regcache *regcache, char *buf)
 129 {
 130   int i;
 131
 132   /* f0 - f31 */
 133   for (i = 0; i < 32; i++)
 134     collect_register (regcache, F0_REGNUM + i,
 135                       buf + offsetof (usr_fcontext_t, ufc_freg[i]));
 136
 137   /* fpscr */
 138   collect_register (regcache, FPSCR_REGNUM,
 139                     buf + offsetof (usr_fcontext_t, ufc_fpscr));
 140 }
 141
 142 /* The store_function for the floating-point register set.  */
 143
 144 static void
 145 lynx_ppc_store_fpregset (struct regcache *regcache, const char *buf)
 146 {
 147   int i;
 148
 149   /* f0 - f31 */
 150   for (i = 0; i < 32; i++)
 151     supply_register (regcache, F0_REGNUM + i,
 152                      buf + offsetof (usr_fcontext_t, ufc_freg[i]));
 153
 154   /* fpscr */
 155   supply_register (regcache, FPSCR_REGNUM,
 156                    buf + offsetof (usr_fcontext_t, ufc_fpscr));
 157 }
 158
 159 /* Implements the lynx_target_ops.arch_setup routine.  */
 160
 161 static void
 162 lynx_ppc_arch_setup (void)
 163 {
 164   init_registers_powerpc_32 ();
 165   lynx_tdesc = tdesc_powerpc_32;
 166 }
 167
 168 /* Description of all the powerpc-lynx register sets.  */
 169
 170 struct lynx_regset_info lynx_target_regsets[] = {
 171   /* General Purpose Registers.  */
 172   {PTRACE_GETREGS, PTRACE_SETREGS, sizeof(usr_econtext_t),
 173    lynx_ppc_fill_gregset, lynx_ppc_store_gregset},
 174   /* Floating Point Registers.  */
 175   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof(usr_fcontext_t),
 176     lynx_ppc_fill_fpregset, lynx_ppc_store_fpregset },
 177   /* End of list marker.  */
 178   {0, 0, -1, NULL, NULL }
 179 };
 180
 181 /* The lynx_target_ops vector for powerpc-lynxos.  */
 182
 183 struct lynx_target_ops the_low_target = {
 184   lynx_ppc_arch_setup,
 185 };