gdb/gdbserver/lynx-ppc-low.c

   1 /* Copyright (C) 2009-2014 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
  21 #include <stdint.h>
  22 #include <limits.h>
  23 #include <sys/ptrace.h>
  24
  25 /* The following two typedefs are defined in a .h file which is not
  26    in the standard include path (/sys/include/family/ppc/ucontext.h),
  27    so we just duplicate them here.  */
  28
  29 /* General register context */
  30 typedef struct usr_econtext_s
  31 {
  32         uint32_t        uec_iregs[32];
  33         uint32_t        uec_inum;
  34         uint32_t        uec_srr0;
  35         uint32_t        uec_srr1;
  36         uint32_t        uec_lr;
  37         uint32_t        uec_ctr;
  38         uint32_t        uec_cr;
  39         uint32_t        uec_xer;
  40         uint32_t        uec_dar;
  41         uint32_t        uec_mq;
  42         uint32_t        uec_msr;
  43         uint32_t        uec_sregs[16];
  44         uint32_t        uec_ss_count;
  45         uint32_t        uec_ss_addr1;
  46         uint32_t        uec_ss_addr2;
  47         uint32_t        uec_ss_code1;
  48         uint32_t        uec_ss_code2;
  49 } usr_econtext_t;
  50
  51 /* Floating point register context */
  52 typedef struct usr_fcontext_s
  53 {
  54         uint64_t        ufc_freg[32];
  55         uint32_t        ufc_fpscr[2];
  56 } usr_fcontext_t;
  57
  58 /* Index of for various registers inside the regcache.  */
  59 #define R0_REGNUM    0
  60 #define F0_REGNUM    32
  61 #define PC_REGNUM    64
  62 #define MSR_REGNUM   65
  63 #define CR_REGNUM    66
  64 #define LR_REGNUM    67
  65 #define CTR_REGNUM   68
  66 #define XER_REGNUM   69
  67 #define FPSCR_REGNUM 70
  68
  69 /* Defined in auto-generated file powerpc-32.c.  */
  70 extern void init_registers_powerpc_32 (void);
  71 extern const struct target_desc *tdesc_powerpc_32;
  72
  73 /* The fill_function for the general-purpose register set.  */
  74
  75 static void
  76 lynx_ppc_fill_gregset (struct regcache *regcache, char *buf)
  77 {
  78   int i;
  79
  80   /* r0 - r31 */
  81   for (i = 0; i < 32; i++)
  82     collect_register (regcache, R0_REGNUM + i,
  83                       buf + offsetof (usr_econtext_t, uec_iregs[i]));
  84
  85   /* The other registers provided in the GP register context.  */
  86   collect_register (regcache, PC_REGNUM,
  87                     buf + offsetof (usr_econtext_t, uec_srr0));
  88   collect_register (regcache, MSR_REGNUM,
  89                     buf + offsetof (usr_econtext_t, uec_srr1));
  90   collect_register (regcache, CR_REGNUM,
  91                     buf + offsetof (usr_econtext_t, uec_cr));
  92   collect_register (regcache, LR_REGNUM,
  93                     buf + offsetof (usr_econtext_t, uec_lr));
  94   collect_register (regcache, CTR_REGNUM,
  95                     buf + offsetof (usr_econtext_t, uec_ctr));
  96   collect_register (regcache, XER_REGNUM,
  97                     buf + offsetof (usr_econtext_t, uec_xer));
  98 }
  99
 100 /* The store_function for the general-purpose register set.  */
 101
 102 static void
 103 lynx_ppc_store_gregset (struct regcache *regcache, const char *buf)
 104 {
 105   int i;
 106
 107   /* r0 - r31 */
 108   for (i = 0; i < 32; i++)
 109     supply_register (regcache, R0_REGNUM + i,
 110                       buf + offsetof (usr_econtext_t, uec_iregs[i]));
 111
 112   /* The other registers provided in the GP register context.  */
 113   supply_register (regcache, PC_REGNUM,
 114                    buf + offsetof (usr_econtext_t, uec_srr0));
 115   supply_register (regcache, MSR_REGNUM,
 116                    buf + offsetof (usr_econtext_t, uec_srr1));
 117   supply_register (regcache, CR_REGNUM,
 118                    buf + offsetof (usr_econtext_t, uec_cr));
 119   supply_register (regcache, LR_REGNUM,
 120                    buf + offsetof (usr_econtext_t, uec_lr));
 121   supply_register (regcache, CTR_REGNUM,
 122                    buf + offsetof (usr_econtext_t, uec_ctr));
 123   supply_register (regcache, XER_REGNUM,
 124                    buf + offsetof (usr_econtext_t, uec_xer));
 125 }
 126
 127 /* The fill_function for the floating-point register set.  */
 128
 129 static void
 130 lynx_ppc_fill_fpregset (struct regcache *regcache, char *buf)
 131 {
 132   int i;
 133
 134   /* f0 - f31 */
 135   for (i = 0; i < 32; i++)
 136     collect_register (regcache, F0_REGNUM + i,
 137                       buf + offsetof (usr_fcontext_t, ufc_freg[i]));
 138
 139   /* fpscr */
 140   collect_register (regcache, FPSCR_REGNUM,
 141                     buf + offsetof (usr_fcontext_t, ufc_fpscr));
 142 }
 143
 144 /* The store_function for the floating-point register set.  */
 145
 146 static void
 147 lynx_ppc_store_fpregset (struct regcache *regcache, const char *buf)
 148 {
 149   int i;
 150
 151   /* f0 - f31 */
 152   for (i = 0; i < 32; i++)
 153     supply_register (regcache, F0_REGNUM + i,
 154                      buf + offsetof (usr_fcontext_t, ufc_freg[i]));
 155
 156   /* fpscr */
 157   supply_register (regcache, FPSCR_REGNUM,
 158                    buf + offsetof (usr_fcontext_t, ufc_fpscr));
 159 }
 160
 161 /* Implements the lynx_target_ops.arch_setup routine.  */
 162
 163 static void
 164 lynx_ppc_arch_setup (void)
 165 {
 166   init_registers_powerpc_32 ();
 167   lynx_tdesc = tdesc_powerpc_32;
 168 }
 169
 170 /* Description of all the powerpc-lynx register sets.  */
 171
 172 struct lynx_regset_info lynx_target_regsets[] = {
 173   /* General Purpose Registers.  */
 174   {PTRACE_GETREGS, PTRACE_SETREGS, sizeof(usr_econtext_t),
 175    lynx_ppc_fill_gregset, lynx_ppc_store_gregset},
 176   /* Floating Point Registers.  */
 177   { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof(usr_fcontext_t),
 178     lynx_ppc_fill_fpregset, lynx_ppc_store_fpregset },
 179   /* End of list marker.  */
 180   {0, 0, -1, NULL, NULL }
 181 };
 182
 183 /* The lynx_target_ops vector for powerpc-lynxos.  */
 184
 185 struct lynx_target_ops the_low_target = {
 186   lynx_ppc_arch_setup,
 187 };