gdb/ppc-tdep.h

   1 /* Target-dependent code for GDB, the GNU debugger.
   2
   3    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef PPC_TDEP_H
  22 #define PPC_TDEP_H
  23
  24 struct gdbarch;
  25 struct frame_info;
  26 struct value;
  27 struct regcache;
  28 struct type;
  29
  30 /* From ppc-linux-tdep.c... */
  31 enum return_value_convention ppc_sysv_abi_return_value (struct gdbarch *gdbarch,
  32                                                         struct type *valtype,
  33                                                         struct regcache *regcache,
  34                                                         gdb_byte *readbuf,
  35                                                         const gdb_byte *writebuf);
  36 enum return_value_convention ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch,
  37                                                                struct type *valtype,
  38                                                                struct regcache *regcache,
  39                                                                gdb_byte *readbuf,
  40                                                                const gdb_byte *writebuf);
  41 CORE_ADDR ppc_sysv_abi_push_dummy_call (struct gdbarch *gdbarch,
  42                                         struct value *function,
  43                                         struct regcache *regcache,
  44                                         CORE_ADDR bp_addr, int nargs,
  45                                         struct value **args, CORE_ADDR sp,
  46                                         int struct_return,
  47                                         CORE_ADDR struct_addr);
  48 CORE_ADDR ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch,
  49                                           struct value *function,
  50                                           struct regcache *regcache,
  51                                           CORE_ADDR bp_addr, int nargs,
  52                                           struct value **args, CORE_ADDR sp,
  53                                           int struct_return,
  54                                           CORE_ADDR struct_addr);
  55 CORE_ADDR ppc64_sysv_abi_adjust_breakpoint_address (struct gdbarch *gdbarch,
  56                                                     CORE_ADDR bpaddr);
  57 int ppc_linux_memory_remove_breakpoint (struct bp_target_info *bp_tgt);
  58 struct link_map_offsets *ppc_linux_svr4_fetch_link_map_offsets (void);
  59 const struct regset *ppc_linux_gregset (int);
  60 const struct regset *ppc_linux_fpregset (void);
  61
  62 enum return_value_convention ppc64_sysv_abi_return_value (struct gdbarch *gdbarch,
  63                                                           struct type *valtype,
  64                                                           struct regcache *regcache,
  65                                                           gdb_byte *readbuf,
  66                                                           const gdb_byte *writebuf);
  67
  68 /* From rs6000-tdep.c... */
  69 int altivec_register_p (int regno);
  70 int spe_register_p (int regno);
  71
  72 /* Return non-zero if the architecture described by GDBARCH has
  73    floating-point registers (f0 --- f31 and fpscr).  */
  74 int ppc_floating_point_unit_p (struct gdbarch *gdbarch);
  75
  76 /* Return non-zero if the architecture described by GDBARCH has
  77    Altivec registers (vr0 --- vr31, vrsave and vscr).  */
  78 int ppc_altivec_support_p (struct gdbarch *gdbarch);
  79
  80 /* Register set description.  */
  81
  82 struct ppc_reg_offsets
  83 {
  84   /* General-purpose registers.  */
  85   int r0_offset;
  86   int gpr_size; /* size for r0-31, pc, ps, lr, ctr.  */
  87   int xr_size;  /* size for cr, xer, mq.  */
  88   int pc_offset;
  89   int ps_offset;
  90   int cr_offset;
  91   int lr_offset;
  92   int ctr_offset;
  93   int xer_offset;
  94   int mq_offset;
  95
  96   /* Floating-point registers.  */
  97   int f0_offset;
  98   int fpscr_offset;
  99   int fpscr_size;
 100
 101   /* AltiVec registers.  */
 102   int vr0_offset;
 103   int vscr_offset;
 104   int vrsave_offset;
 105 };
 106
 107 /* Supply register REGNUM in the general-purpose register set REGSET
 108    from the buffer specified by GREGS and LEN to register cache
 109    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
 110
 111 extern void ppc_supply_gregset (const struct regset *regset,
 112                                 struct regcache *regcache,
 113                                 int regnum, const void *gregs, size_t len);
 114
 115 /* Supply register REGNUM in the floating-point register set REGSET
 116    from the buffer specified by FPREGS and LEN to register cache
 117    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
 118
 119 extern void ppc_supply_fpregset (const struct regset *regset,
 120                                  struct regcache *regcache,
 121                                  int regnum, const void *fpregs, size_t len);
 122
 123 /* Supply register REGNUM in the Altivec register set REGSET
 124    from the buffer specified by VRREGS and LEN to register cache
 125    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
 126
 127 extern void ppc_supply_vrregset (const struct regset *regset,
 128                                  struct regcache *regcache,
 129                                  int regnum, const void *vrregs, size_t len);
 130
 131 /* Collect register REGNUM in the general-purpose register set
 132    REGSET. from register cache REGCACHE into the buffer specified by
 133    GREGS and LEN.  If REGNUM is -1, do this for all registers in
 134    REGSET.  */
 135
 136 extern void ppc_collect_gregset (const struct regset *regset,
 137                                  const struct regcache *regcache,
 138                                  int regnum, void *gregs, size_t len);
 139
 140 /* Collect register REGNUM in the floating-point register set
 141    REGSET. from register cache REGCACHE into the buffer specified by
 142    FPREGS and LEN.  If REGNUM is -1, do this for all registers in
 143    REGSET.  */
 144
 145 extern void ppc_collect_fpregset (const struct regset *regset,
 146                                   const struct regcache *regcache,
 147                                   int regnum, void *fpregs, size_t len);
 148
 149 /* Collect register REGNUM in the Altivec register set
 150    REGSET from register cache REGCACHE into the buffer specified by
 151    VRREGS and LEN.  If REGNUM is -1, do this for all registers in
 152    REGSET.  */
 153
 154 extern void ppc_collect_vrregset (const struct regset *regset,
 155                                   const struct regcache *regcache,
 156                                   int regnum, void *vrregs, size_t len);
 157
 158 /* Private data that this module attaches to struct gdbarch. */
 159
 160 /* Vector ABI used by the inferior.  */
 161 enum powerpc_vector_abi
 162 {
 163   POWERPC_VEC_AUTO,
 164   POWERPC_VEC_GENERIC,
 165   POWERPC_VEC_ALTIVEC,
 166   POWERPC_VEC_SPE,
 167   POWERPC_VEC_LAST
 168 };
 169
 170 struct gdbarch_tdep
 171   {
 172     int wordsize;               /* Size in bytes of fixed-point word.  */
 173     int soft_float;             /* Avoid FP registers for arguments?  */
 174
 175     /* How to pass vector arguments.  Never set to AUTO or LAST.  */
 176     enum powerpc_vector_abi vector_abi;
 177
 178     int ppc_gp0_regnum;         /* GPR register 0 */
 179     int ppc_toc_regnum;         /* TOC register */
 180     int ppc_ps_regnum;          /* Processor (or machine) status (%msr) */
 181     int ppc_cr_regnum;          /* Condition register */
 182     int ppc_lr_regnum;          /* Link register */
 183     int ppc_ctr_regnum;         /* Count register */
 184     int ppc_xer_regnum;         /* Integer exception register */
 185
 186     /* Not all PPC and RS6000 variants will have the registers
 187        represented below.  A -1 is used to indicate that the register
 188        is not present in this variant.  */
 189
 190     /* Floating-point registers.  */
 191     int ppc_fp0_regnum;         /* floating-point register 0 */
 192     int ppc_fpscr_regnum;       /* fp status and condition register */
 193
 194     /* Multiplier-Quotient Register (older POWER architectures only).  */
 195     int ppc_mq_regnum;
 196
 197     /* Altivec registers.  */
 198     int ppc_vr0_regnum;         /* First AltiVec register */
 199     int ppc_vrsave_regnum;      /* Last AltiVec register */
 200
 201     /* SPE registers.  */
 202     int ppc_ev0_upper_regnum;   /* First GPR upper half register */
 203     int ppc_ev0_regnum;         /* First ev register */
 204     int ppc_ev31_regnum;        /* Last ev register */
 205     int ppc_acc_regnum;         /* SPE 'acc' register */
 206     int ppc_spefscr_regnum;     /* SPE 'spefscr' register */
 207
 208     /* Offset to ABI specific location where link register is saved.  */
 209     int lr_frame_offset;
 210
 211     /* An array of integers, such that sim_regno[I] is the simulator
 212        register number for GDB register number I, or -1 if the
 213        simulator does not implement that register.  */
 214     int *sim_regno;
 215
 216     /* Minimum possible text address.  */
 217     CORE_ADDR text_segment_base;
 218
 219     /* ISA-specific types.  */
 220     struct type *ppc_builtin_type_vec64;
 221 };
 222
 223
 224 /* Constants for register set sizes.  */
 225 enum
 226   {
 227     ppc_num_gprs = 32,          /* 32 general-purpose registers */
 228     ppc_num_fprs = 32,          /* 32 floating-point registers */
 229     ppc_num_srs = 16,           /* 16 segment registers */
 230     ppc_num_vrs = 32            /* 32 Altivec vector registers */
 231   };
 232
 233
 234 /* Register number constants.  These are GDB internal register
 235    numbers; they are not used for the simulator or remote targets.
 236    Extra SPRs (those other than MQ, CTR, LR, XER, SPEFSCR) are given
 237    numbers above PPC_NUM_REGS.  So are segment registers and other
 238    target-defined registers.  */
 239 enum {
 240   PPC_R0_REGNUM = 0,
 241   PPC_F0_REGNUM = 32,
 242   PPC_PC_REGNUM = 64,
 243   PPC_MSR_REGNUM = 65,
 244   PPC_CR_REGNUM = 66,
 245   PPC_LR_REGNUM = 67,
 246   PPC_CTR_REGNUM = 68,
 247   PPC_XER_REGNUM = 69,
 248   PPC_FPSCR_REGNUM = 70,
 249   PPC_MQ_REGNUM = 71,
 250   PPC_SPE_UPPER_GP0_REGNUM = 72,
 251   PPC_SPE_ACC_REGNUM = 104,
 252   PPC_SPE_FSCR_REGNUM = 105,
 253   PPC_VR0_REGNUM = 106,
 254   PPC_VSCR_REGNUM = 138,
 255   PPC_VRSAVE_REGNUM = 139,
 256   PPC_NUM_REGS
 257 };
 258
 259
 260 /* Instruction size.  */
 261 #define PPC_INSN_SIZE 4
 262
 263 /* Estimate for the maximum number of instrctions in a function epilogue.  */
 264 #define PPC_MAX_EPILOGUE_INSTRUCTIONS  52
 265
 266 extern struct target_desc *tdesc_powerpc_e500;
 267
 268 #endif /* ppc-tdep.h */