gdb/ppc-tdep.h

/* Target-dependent code for GDB, the GNU debugger.

   Copyright (C) 2000-2022 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef PPC_TDEP_H
#define PPC_TDEP_H

#include "gdbarch.h"

struct gdbarch;
class frame_info_ptr;
struct value;
struct regcache;
struct type;

/* From ppc-sysv-tdep.c ...  */
enum return_value_convention ppc_sysv_abi_return_value (struct gdbarch *gdbarch,
							struct value *function,
							struct type *valtype,
							struct regcache *regcache,
							gdb_byte *readbuf,
							const gdb_byte *writebuf);
enum return_value_convention ppc_sysv_abi_broken_return_value (struct gdbarch *gdbarch,
							       struct value *function,
							       struct type *valtype,
							       struct regcache *regcache,
							       gdb_byte *readbuf,
							       const gdb_byte *writebuf);

CORE_ADDR ppc_sysv_abi_push_dummy_call
  (struct gdbarch *gdbarch, struct value *function, struct regcache *regcache,
   CORE_ADDR bp_addr, int nargs, struct value **args, CORE_ADDR sp,
   function_call_return_method return_method, CORE_ADDR struct_addr);

CORE_ADDR ppc64_sysv_abi_push_dummy_call
  (struct gdbarch *gdbarch, struct value *function, struct regcache *regcache,
   CORE_ADDR bp_addr, int nargs, struct value **args, CORE_ADDR sp,
   function_call_return_method return_method, CORE_ADDR struct_addr);

enum return_value_convention ppc64_sysv_abi_return_value (struct gdbarch *gdbarch,
							  struct value *function,
							  struct type *valtype,
							  struct regcache *regcache,
							  gdb_byte *readbuf,
							  const gdb_byte *writebuf);

/* From rs6000-tdep.c...  */
int altivec_register_p (struct gdbarch *gdbarch, int regno);
int vsx_register_p (struct gdbarch *gdbarch, int regno);
int spe_register_p (struct gdbarch *gdbarch, int regno);

/* Return non-zero if the architecture described by GDBARCH has
   floating-point registers (f0 --- f31 and fpscr).  */
int ppc_floating_point_unit_p (struct gdbarch *gdbarch);

/* Return non-zero if the architecture described by GDBARCH has
   Altivec registers (vr0 --- vr31, vrsave and vscr).  */
int ppc_altivec_support_p (struct gdbarch *gdbarch);

/* Return non-zero if the architecture described by GDBARCH has
   VSX registers (vsr0 --- vsr63).  */
int vsx_support_p (struct gdbarch *gdbarch);
std::vector<CORE_ADDR> ppc_deal_with_atomic_sequence
  (struct regcache *regcache);


/* Register set description.  */

struct ppc_reg_offsets
{
  /* General-purpose registers.  */
  int r0_offset;
  int gpr_size; /* size for r0-31, pc, ps, lr, ctr.  */
  int xr_size;  /* size for cr, xer, mq.  */
  int pc_offset;
  int ps_offset;
  int cr_offset;
  int lr_offset;
  int ctr_offset;
  int xer_offset;
  int mq_offset;

  /* Floating-point registers.  */
  int f0_offset;
  int fpscr_offset;
  int fpscr_size;
};

extern void ppc_supply_reg (struct regcache *regcache, int regnum,
			    const gdb_byte *regs, size_t offset, int regsize);

extern void ppc_collect_reg (const struct regcache *regcache, int regnum,
			     gdb_byte *regs, size_t offset, int regsize);

/* Supply register REGNUM in the general-purpose register set REGSET
   from the buffer specified by GREGS and LEN to register cache
   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

extern void ppc_supply_gregset (const struct regset *regset,
				struct regcache *regcache,
				int regnum, const void *gregs, size_t len);

/* Supply register REGNUM in the floating-point register set REGSET
   from the buffer specified by FPREGS and LEN to register cache
   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

extern void ppc_supply_fpregset (const struct regset *regset,
				 struct regcache *regcache,
				 int regnum, const void *fpregs, size_t len);

/* Supply register REGNUM in the Altivec register set REGSET
   from the buffer specified by VRREGS and LEN to register cache
   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

extern void ppc_supply_vrregset (const struct regset *regset,
				 struct regcache *regcache,
				 int regnum, const void *vrregs, size_t len);

/* Supply register REGNUM in the VSX register set REGSET
   from the buffer specified by VSXREGS and LEN to register cache
   REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */

extern void ppc_supply_vsxregset (const struct regset *regset,
				 struct regcache *regcache,
				 int regnum, const void *vsxregs, size_t len);

/* Collect register REGNUM in the general-purpose register set
   REGSET, from register cache REGCACHE into the buffer specified by
   GREGS and LEN.  If REGNUM is -1, do this for all registers in
   REGSET.  */

extern void ppc_collect_gregset (const struct regset *regset,
				 const struct regcache *regcache,
				 int regnum, void *gregs, size_t len);

/* Collect register REGNUM in the floating-point register set
   REGSET, from register cache REGCACHE into the buffer specified by
   FPREGS and LEN.  If REGNUM is -1, do this for all registers in
   REGSET.  */

extern void ppc_collect_fpregset (const struct regset *regset,
				  const struct regcache *regcache,
				  int regnum, void *fpregs, size_t len);

/* Collect register REGNUM in the Altivec register set
   REGSET from register cache REGCACHE into the buffer specified by
   VRREGS and LEN.  If REGNUM is -1, do this for all registers in
   REGSET.  */

extern void ppc_collect_vrregset (const struct regset *regset,
				  const struct regcache *regcache,
				  int regnum, void *vrregs, size_t len);

/* Collect register REGNUM in the VSX register set
   REGSET from register cache REGCACHE into the buffer specified by
   VSXREGS and LEN.  If REGNUM is -1, do this for all registers in
   REGSET.  */

extern void ppc_collect_vsxregset (const struct regset *regset,
				  const struct regcache *regcache,
				  int regnum, void *vsxregs, size_t len);

extern CORE_ADDR ppc64_sysv_get_return_buf_addr (type*, frame_info_ptr);

/* Private data that this module attaches to struct gdbarch.  */

/* ELF ABI version used by the inferior.  */
enum powerpc_elf_abi
{
  POWERPC_ELF_AUTO,
  POWERPC_ELF_V1,
  POWERPC_ELF_V2,
  POWERPC_ELF_LAST
};

/* Vector ABI used by the inferior.  */
enum powerpc_vector_abi
{
  POWERPC_VEC_AUTO,
  POWERPC_VEC_GENERIC,
  POWERPC_VEC_ALTIVEC,
  POWERPC_VEC_SPE,
  POWERPC_VEC_LAST
};

/* long double ABI version used by the inferior.  */
enum powerpc_long_double_abi
{
  POWERPC_LONG_DOUBLE_AUTO,
  POWERPC_LONG_DOUBLE_IBM128,
  POWERPC_LONG_DOUBLE_IEEE128,
  POWERPC_LONG_DOUBLE_LAST
};

struct ppc_gdbarch_tdep : gdbarch_tdep_base
  {
    int wordsize = 0;		/* Size in bytes of fixed-point word.  */
    int soft_float = 0;		/* Avoid FP registers for arguments?  */

    enum powerpc_elf_abi elf_abi {};	/* ELF ABI version.  */

    /* Format to use for the "long double" data type.  */
    enum powerpc_long_double_abi long_double_abi {};

    /* How to pass vector arguments.  Never set to AUTO or LAST.  */
    enum powerpc_vector_abi vector_abi {};

    int ppc_gp0_regnum = 0;		/* GPR register 0 */
    int ppc_toc_regnum = 0;		/* TOC register */
    int ppc_ps_regnum = 0;		/* Processor (or machine) status (%msr) */
    int ppc_cr_regnum = 0;		/* Condition register */
    int ppc_lr_regnum = 0;		/* Link register */
    int ppc_ctr_regnum = 0;		/* Count register */
    int ppc_xer_regnum = 0;		/* Integer exception register */

    /* Not all PPC and RS6000 variants will have the registers
       represented below.  A -1 is used to indicate that the register
       is not present in this variant.  */

    /* Floating-point registers.  */
    int ppc_fp0_regnum = 0;	/* Floating-point register 0.  */
    int ppc_fpscr_regnum = 0;	/* fp status and condition register.  */

    /* Multiplier-Quotient Register (older POWER architectures only).  */
    int ppc_mq_regnum = 0;

    /* POWER7 VSX registers.  */
    int ppc_vsr0_regnum = 0;		/* First VSX register.  */
    int ppc_vsr0_upper_regnum = 0; 	/* First right most dword vsx register.  */
    int ppc_efpr0_regnum = 0;		/* First Extended FP register.  */

    /* Altivec registers.  */
    int ppc_vr0_regnum = 0;	/* First AltiVec register.  */
    int ppc_vrsave_regnum = 0;	/* Last AltiVec register.  */

    /* Altivec pseudo-register vX aliases for the raw vrX
       registers.  */
    int ppc_v0_alias_regnum = 0;

    /* SPE registers.  */
    int ppc_ev0_upper_regnum = 0;   /* First GPR upper half register.  */
    int ppc_ev0_regnum = 0;         /* First ev register.  */
    int ppc_acc_regnum = 0;         /* SPE 'acc' register.  */
    int ppc_spefscr_regnum = 0;     /* SPE 'spefscr' register.  */

    /* Program Priority Register.  */
    int ppc_ppr_regnum = 0;

    /* Data Stream Control Register.  */
    int ppc_dscr_regnum = 0;

    /* Target Address Register.  */
    int ppc_tar_regnum = 0;

    /* Decimal 128 registers.  */
    int ppc_dl0_regnum = 0;	/* First Decimal128 argument register pair.  */

    int have_ebb = 0;

    /* PMU registers.  */
    int ppc_mmcr0_regnum = 0;
    int ppc_mmcr2_regnum = 0;
    int ppc_siar_regnum = 0;
    int ppc_sdar_regnum = 0;
    int ppc_sier_regnum = 0;

    /* Hardware Transactional Memory registers.  */
    int have_htm_spr = 0;
    int have_htm_core = 0;
    int have_htm_fpu = 0;
    int have_htm_altivec = 0;
    int have_htm_vsx = 0;
    int ppc_cppr_regnum = 0;
    int ppc_cdscr_regnum = 0;
    int ppc_ctar_regnum = 0;

    /* HTM pseudo registers.  */
    int ppc_cdl0_regnum = 0;
    int ppc_cvsr0_regnum = 0;
    int ppc_cefpr0_regnum = 0;

    /* Offset to ABI specific location where link register is saved.  */
    int lr_frame_offset = 0;

    /* An array of integers, such that sim_regno[I] is the simulator
       register number for GDB register number I, or -1 if the
       simulator does not implement that register.  */
    int *sim_regno = nullptr;

    /* ISA-specific types.  */
    struct type *ppc_builtin_type_vec64 = nullptr;
    struct type *ppc_builtin_type_vec128 = nullptr;

    int (*ppc_syscall_record) (struct regcache *regcache) = nullptr;
};


/* Constants for register set sizes.  */
enum
  {
    ppc_num_gprs = 32,		/* 32 general-purpose registers.  */
    ppc_num_fprs = 32,		/* 32 floating-point registers.  */
    ppc_num_srs = 16,		/* 16 segment registers.  */
    ppc_num_vrs = 32,		/* 32 Altivec vector registers.  */
    ppc_num_vshrs = 32,		/* 32 doublewords (dword 1 of vs0~vs31).  */
    ppc_num_vsrs = 64,		/* 64 VSX vector registers.  */
    ppc_num_efprs = 32		/* 32 Extended FP registers.  */
  };


/* Register number constants.  These are GDB internal register
   numbers; they are not used for the simulator or remote targets.
   Extra SPRs (those other than MQ, CTR, LR, XER, SPEFSCR) are given
   numbers above PPC_NUM_REGS.  So are segment registers and other
   target-defined registers.  */
enum {
  PPC_R0_REGNUM = 0,
  PPC_F0_REGNUM = 32,
  PPC_PC_REGNUM = 64,
  PPC_MSR_REGNUM = 65,
  PPC_CR_REGNUM = 66,
  PPC_LR_REGNUM = 67,
  PPC_CTR_REGNUM = 68,
  PPC_XER_REGNUM = 69,
  PPC_FPSCR_REGNUM = 70,
  PPC_MQ_REGNUM = 71,
  PPC_SPE_UPPER_GP0_REGNUM = 72,
  PPC_SPE_ACC_REGNUM = 104,
  PPC_SPE_FSCR_REGNUM = 105,
  PPC_VR0_REGNUM = 106,
  PPC_VSCR_REGNUM = 138,
  PPC_VRSAVE_REGNUM = 139,
  PPC_VSR0_UPPER_REGNUM = 140,
  PPC_VSR31_UPPER_REGNUM = 171,
  PPC_PPR_REGNUM = 172,
  PPC_DSCR_REGNUM = 173,
  PPC_TAR_REGNUM = 174,

  /* EBB registers.  */
  PPC_BESCR_REGNUM = 175,
  PPC_EBBHR_REGNUM = 176,
  PPC_EBBRR_REGNUM = 177,

  /* PMU registers.  */
  PPC_MMCR0_REGNUM = 178,
  PPC_MMCR2_REGNUM = 179,
  PPC_SIAR_REGNUM = 180,
  PPC_SDAR_REGNUM = 181,
  PPC_SIER_REGNUM = 182,

  /* Hardware transactional memory registers.  */
  PPC_TFHAR_REGNUM = 183,
  PPC_TEXASR_REGNUM = 184,
  PPC_TFIAR_REGNUM = 185,

  PPC_CR0_REGNUM = 186,
  PPC_CCR_REGNUM = 218,
  PPC_CXER_REGNUM = 219,
  PPC_CLR_REGNUM = 220,
  PPC_CCTR_REGNUM = 221,

  PPC_CF0_REGNUM = 222,
  PPC_CFPSCR_REGNUM = 254,

  PPC_CVR0_REGNUM = 255,
  PPC_CVSCR_REGNUM = 287,
  PPC_CVRSAVE_REGNUM = 288,

  PPC_CVSR0_UPPER_REGNUM = 289,

  PPC_CPPR_REGNUM = 321,
  PPC_CDSCR_REGNUM = 322,
  PPC_CTAR_REGNUM = 323,
  PPC_NUM_REGS
};

/* Big enough to hold the size of the largest register in bytes.  */
#define PPC_MAX_REGISTER_SIZE	64

#define PPC_IS_EBB_REGNUM(i) \
	((i) >= PPC_BESCR_REGNUM && (i) <= PPC_EBBRR_REGNUM)

#define PPC_IS_PMU_REGNUM(i) \
	((i) >= PPC_MMCR0_REGNUM && (i) <= PPC_SIER_REGNUM)

#define PPC_IS_TMSPR_REGNUM(i) \
  ((i) >= PPC_TFHAR_REGNUM && (i) <= PPC_TFIAR_REGNUM)

#define PPC_IS_CKPTGP_REGNUM(i) \
  ((i) >= PPC_CR0_REGNUM && (i) <= PPC_CCTR_REGNUM)

#define PPC_IS_CKPTFP_REGNUM(i) \
  ((i) >= PPC_CF0_REGNUM && (i) <= PPC_CFPSCR_REGNUM)

#define PPC_IS_CKPTVMX_REGNUM(i) \
  ((i) >= PPC_CVR0_REGNUM && (i) <= PPC_CVRSAVE_REGNUM)

#define PPC_IS_CKPTVSX_REGNUM(i) \
  ((i) >= PPC_CVSR0_UPPER_REGNUM && (i) < (PPC_CVSR0_UPPER_REGNUM + 32))

/* An instruction to match.  */

struct ppc_insn_pattern
{
  unsigned int mask;            /* mask the insn with this...  */
  unsigned int data;            /* ...and see if it matches this.  */
  int optional;                 /* If non-zero, this insn may be absent.  */
};

extern int ppc_insns_match_pattern (frame_info_ptr frame, CORE_ADDR pc,
				    const struct ppc_insn_pattern *pattern,
				    unsigned int *insns);
extern CORE_ADDR ppc_insn_d_field (unsigned int insn);

extern CORE_ADDR ppc_insn_ds_field (unsigned int insn);
extern CORE_ADDR ppc_insn_prefix_dform (unsigned int insn1,
					unsigned int insn2);

extern int ppc_process_record (struct gdbarch *gdbarch,
			       struct regcache *regcache, CORE_ADDR addr);

/* Instruction size.  */
#define PPC_INSN_SIZE 4

/* Estimate for the maximum number of instructions in a function epilogue.  */
#define PPC_MAX_EPILOGUE_INSTRUCTIONS  52

struct ppc_inferior_data
{
  /* This is an optional in case we add more fields to ppc_inferior_data, we
     don't want it instantiated as soon as we get the ppc_inferior_data for an
     inferior.  */
  gdb::optional<displaced_step_buffers> disp_step_buf;
};

extern ppc_inferior_data * get_ppc_per_inferior (inferior *inf);

#endif /* ppc-tdep.h */