[thirdparty/binutils-gdb.git] / gdbserver / linux-loongarch-low.cc

/* GNU/Linux/LoongArch specific low level interface, for the remote server
   for GDB.
   Copyright (C) 2022-2024 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/>.  */

#include "linux-low.h"
#include "tdesc.h"
#include "elf/common.h"
#include "arch/loongarch.h"

/* Linux target ops definitions for the LoongArch architecture.  */

class loongarch_target : public linux_process_target
{
public:

  const regs_info *get_regs_info () override;

  int breakpoint_kind_from_pc (CORE_ADDR *pcptr) override;

  const gdb_byte *sw_breakpoint_from_kind (int kind, int *size) override;

protected:

  void low_arch_setup () override;

  bool low_cannot_fetch_register (int regno) override;

  bool low_cannot_store_register (int regno) override;

  bool low_fetch_register (regcache *regcache, int regno) override;

  bool low_supports_breakpoints () override;

  CORE_ADDR low_get_pc (regcache *regcache) override;

  void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;

  bool low_breakpoint_at (CORE_ADDR pc) override;
};

/* The singleton target ops object.  */

static loongarch_target the_loongarch_target;

bool
loongarch_target::low_cannot_fetch_register (int regno)
{
  gdb_assert_not_reached ("linux target op low_cannot_fetch_register "
			  "is not implemented by the target");
}

bool
loongarch_target::low_cannot_store_register (int regno)
{
  gdb_assert_not_reached ("linux target op low_cannot_store_register "
			  "is not implemented by the target");
}

/* Implementation of linux target ops method "low_arch_setup".  */

void
loongarch_target::low_arch_setup ()
{
  static const char *expedite_regs[] = { "r3", "pc", NULL };
  loongarch_gdbarch_features features;
  target_desc_up tdesc;

  features.xlen = sizeof (elf_greg_t);
  tdesc = loongarch_create_target_description (features);

  if (tdesc->expedite_regs.empty ())
    {
      init_target_desc (tdesc.get (), expedite_regs);
      gdb_assert (!tdesc->expedite_regs.empty ());
    }
  current_process ()->tdesc = tdesc.release ();
}

/* Collect GPRs from REGCACHE into BUF.  */

static void
loongarch_fill_gregset (struct regcache *regcache, void *buf)
{
  elf_gregset_t *regset = (elf_gregset_t *) buf;
  int i;

  for (i = 1; i < 32; i++)
    collect_register (regcache, i, *regset + i);
  collect_register (regcache, LOONGARCH_ORIG_A0_REGNUM, *regset + LOONGARCH_ORIG_A0_REGNUM);
  collect_register (regcache, LOONGARCH_PC_REGNUM, *regset + LOONGARCH_PC_REGNUM);
  collect_register (regcache, LOONGARCH_BADV_REGNUM, *regset + LOONGARCH_BADV_REGNUM);
}

/* Supply GPRs from BUF into REGCACHE.  */

static void
loongarch_store_gregset (struct regcache *regcache, const void *buf)
{
  const elf_gregset_t *regset = (const elf_gregset_t *) buf;
  int i;

  supply_register_zeroed (regcache, 0);
  for (i = 1; i < 32; i++)
    supply_register (regcache, i, *regset + i);
  supply_register (regcache, LOONGARCH_ORIG_A0_REGNUM, *regset + LOONGARCH_ORIG_A0_REGNUM);
  supply_register (regcache, LOONGARCH_PC_REGNUM, *regset + LOONGARCH_PC_REGNUM);
  supply_register (regcache, LOONGARCH_BADV_REGNUM, *regset + LOONGARCH_BADV_REGNUM);
}

/* Collect FPRs from REGCACHE into BUF.  */

static void
loongarch_fill_fpregset (struct regcache *regcache, void *buf)
{
  gdb_byte *regbuf = nullptr;
  int fprsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FP_REGNUM);
  int fccsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FCC_REGNUM);

  for (int i = 0; i < LOONGARCH_LINUX_NUM_FPREGSET; i++)
    {
      regbuf = (gdb_byte *)buf + fprsize * i;
      collect_register (regcache, LOONGARCH_FIRST_FP_REGNUM + i, regbuf);
    }

  for (int i = 0; i < LOONGARCH_LINUX_NUM_FCC; i++)
    {
      regbuf = (gdb_byte *)buf + fprsize * LOONGARCH_LINUX_NUM_FPREGSET +
	fccsize * i;
      collect_register (regcache, LOONGARCH_FIRST_FCC_REGNUM + i, regbuf);
    }

  regbuf = (gdb_byte *)buf + fprsize * LOONGARCH_LINUX_NUM_FPREGSET +
    fccsize * LOONGARCH_LINUX_NUM_FCC;
  collect_register (regcache, LOONGARCH_FCSR_REGNUM, regbuf);
}

/* Supply FPRs from BUF into REGCACHE.  */

static void
loongarch_store_fpregset (struct regcache *regcache, const void *buf)
{
  const gdb_byte *regbuf = nullptr;
  int fprsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FP_REGNUM);
  int fccsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FCC_REGNUM);

  for (int i = 0; i < LOONGARCH_LINUX_NUM_FPREGSET; i++)
    {
      regbuf = (const gdb_byte *)buf + fprsize * i;
      supply_register (regcache, LOONGARCH_FIRST_FP_REGNUM + i, regbuf);
    }

  for (int i = 0; i < LOONGARCH_LINUX_NUM_FCC; i++)
    {
      regbuf = (const gdb_byte *)buf + fprsize * LOONGARCH_LINUX_NUM_FPREGSET +
	fccsize * i;
      supply_register (regcache, LOONGARCH_FIRST_FCC_REGNUM + i, regbuf);
    }

  regbuf = (const gdb_byte *)buf + fprsize * LOONGARCH_LINUX_NUM_FPREGSET +
    fccsize * LOONGARCH_LINUX_NUM_FCC;
  supply_register (regcache, LOONGARCH_FCSR_REGNUM, regbuf);
}

/* Collect lsx regs from REGCACHE into BUF.  */

static void
loongarch_fill_lsxregset (struct regcache *regcache, void *buf)
{
  elf_lsxregset_t *regset = (elf_lsxregset_t *) buf;
  int i;

  for (i = 0; i < LOONGARCH_LINUX_NUM_LSXREGSET; i++)
    collect_register (regcache, LOONGARCH_FIRST_LSX_REGNUM + i, *regset + i);
}

/* Supply lsx regs from BUF into REGCACHE.  */

static void
loongarch_store_lsxregset (struct regcache *regcache, const void *buf)
{
  const elf_lsxregset_t *regset = (const elf_lsxregset_t *) buf;
  int i;

  for (i = 0; i < LOONGARCH_LINUX_NUM_LSXREGSET; i++)
    supply_register (regcache, LOONGARCH_FIRST_LSX_REGNUM + i, *regset + i);
}

/* Collect lasx regs from REGCACHE into BUF.  */

static void
loongarch_fill_lasxregset (struct regcache *regcache, void *buf)
{
  elf_lasxregset_t *regset = (elf_lasxregset_t *) buf;
  int i;

  for (i = 0; i < LOONGARCH_LINUX_NUM_LASXREGSET; i++)
    collect_register (regcache, LOONGARCH_FIRST_LASX_REGNUM + i, *regset + i);
}

/* Supply lasx regs from BUF into REGCACHE.  */

static void
loongarch_store_lasxregset (struct regcache *regcache, const void *buf)
{
  const elf_lasxregset_t *regset = (const elf_lasxregset_t *) buf;
  int i;

  for (i = 0; i < LOONGARCH_LINUX_NUM_LASXREGSET; i++)
    supply_register (regcache, LOONGARCH_FIRST_LASX_REGNUM + i, *regset + i);
}

/* Collect lbt regs from REGCACHE into BUF.  */

static void
loongarch_fill_lbtregset (struct regcache *regcache, void *buf)
{
  gdb_byte *regbuf = (gdb_byte*)buf;
  int scrsize = register_size (regcache->tdesc, LOONGARCH_FIRST_SCR_REGNUM);
  int eflagssize = register_size (regcache->tdesc, LOONGARCH_EFLAGS_REGNUM);
  int i;

  for (i = 0; i < LOONGARCH_LINUX_NUM_SCR; i++)
    collect_register (regcache, LOONGARCH_FIRST_SCR_REGNUM + i, regbuf + scrsize * i);

  collect_register (regcache, LOONGARCH_EFLAGS_REGNUM,
		    regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize);
  collect_register (regcache, LOONGARCH_FTOP_REGNUM,
		    regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize + eflagssize);

}

/* Supply lbt regs from BUF into REGCACHE.  */

static void
loongarch_store_lbtregset (struct regcache *regcache, const void *buf)
{

  gdb_byte *regbuf = (gdb_byte*)buf;
  int scrsize = register_size (regcache->tdesc, LOONGARCH_FIRST_SCR_REGNUM);
  int eflagssize = register_size (regcache->tdesc, LOONGARCH_EFLAGS_REGNUM);
  int i;

  for (i = 0; i < LOONGARCH_LINUX_NUM_SCR; i++)
    supply_register (regcache, LOONGARCH_FIRST_SCR_REGNUM + i, regbuf + scrsize * i);

  supply_register (regcache, LOONGARCH_EFLAGS_REGNUM,
		    regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize);
  supply_register (regcache, LOONGARCH_FTOP_REGNUM,
		    regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize + eflagssize);

}

/* LoongArch/Linux regsets.  */
static struct regset_info loongarch_regsets[] = {
  { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, sizeof (elf_gregset_t),
    GENERAL_REGS, loongarch_fill_gregset, loongarch_store_gregset },
  { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_FPREGSET, sizeof (elf_fpregset_t),
    FP_REGS, loongarch_fill_fpregset, loongarch_store_fpregset },
  { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_LARCH_LSX, sizeof (elf_lsxregset_t),
    OPTIONAL_REGS, loongarch_fill_lsxregset, loongarch_store_lsxregset },
  { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_LARCH_LASX, sizeof (elf_lasxregset_t),
    OPTIONAL_REGS, loongarch_fill_lasxregset, loongarch_store_lasxregset },
  { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_LARCH_LBT, LOONGARCH_LBT_REGS_SIZE,
    OPTIONAL_REGS, loongarch_fill_lbtregset, loongarch_store_lbtregset },
  NULL_REGSET
};

/* LoongArch/Linux regset information.  */
static struct regsets_info loongarch_regsets_info =
  {
    loongarch_regsets, /* regsets */
    0, /* num_regsets */
    NULL, /* disabled_regsets */
  };

/* Definition of linux_target_ops data member "regs_info".  */
static struct regs_info loongarch_regs =
  {
    NULL, /* regset_bitmap */
    NULL, /* usrregs */
    &loongarch_regsets_info,
  };

/* Implementation of linux target ops method "get_regs_info".  */

const regs_info *
loongarch_target::get_regs_info ()
{
  return &loongarch_regs;
}

/* Implementation of linux target ops method "low_fetch_register".  */

bool
loongarch_target::low_fetch_register (regcache *regcache, int regno)
{
  if (regno != 0)
    return false;
  supply_register_zeroed (regcache, 0);
  return true;
}

bool
loongarch_target::low_supports_breakpoints ()
{
  return true;
}

/* Implementation of linux target ops method "low_get_pc".  */

CORE_ADDR
loongarch_target::low_get_pc (regcache *regcache)
{
  if (register_size (regcache->tdesc, 0) == 8)
    return linux_get_pc_64bit (regcache);
  else
    return linux_get_pc_32bit (regcache);
}

/* Implementation of linux target ops method "low_set_pc".  */

void
loongarch_target::low_set_pc (regcache *regcache, CORE_ADDR newpc)
{
  if (register_size (regcache->tdesc, 0) == 8)
    linux_set_pc_64bit (regcache, newpc);
  else
    linux_set_pc_32bit (regcache, newpc);
}

#define loongarch_breakpoint_len 4

/* LoongArch BRK software debug mode instruction.
   This instruction needs to match gdb/loongarch-tdep.c
   (loongarch_default_breakpoint).  */
static const gdb_byte loongarch_breakpoint[] = {0x05, 0x00, 0x2a, 0x00};

/* Implementation of target ops method "breakpoint_kind_from_pc".  */

int
loongarch_target::breakpoint_kind_from_pc (CORE_ADDR *pcptr)
{
  return loongarch_breakpoint_len;
}

/* Implementation of target ops method "sw_breakpoint_from_kind".  */

const gdb_byte *
loongarch_target::sw_breakpoint_from_kind (int kind, int *size)
{
  *size = loongarch_breakpoint_len;
  return (const gdb_byte *) &loongarch_breakpoint;
}

/* Implementation of linux target ops method "low_breakpoint_at".  */

bool
loongarch_target::low_breakpoint_at (CORE_ADDR pc)
{
  gdb_byte insn[loongarch_breakpoint_len];

  read_memory (pc, (unsigned char *) &insn, loongarch_breakpoint_len);
  if (memcmp (insn, loongarch_breakpoint, loongarch_breakpoint_len) == 0)
    return true;

  return false;
}

/* The linux target ops object.  */

linux_process_target *the_linux_target = &the_loongarch_target;

/* Initialize the LoongArch/Linux target.  */

void
initialize_low_arch ()
{
  initialize_regsets_info (&loongarch_regsets_info);
}
Commit	Line	Data
e5ab6af5 YT	1	/* GNU/Linux/LoongArch specific low level interface, for the remote server
e5ab6af5 YT	2	for GDB.
1d506c26	3	Copyright (C) 2022-2024 Free Software Foundation, Inc.
e5ab6af5 YT	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	19
e5ab6af5 YT	20	#include "linux-low.h"
	21	#include "tdesc.h"
	22	#include "elf/common.h"
	23	#include "arch/loongarch.h"
	24
	25	/* Linux target ops definitions for the LoongArch architecture. */
	26
	27	class loongarch_target : public linux_process_target
	28	{
	29	public:
	30
	31	const regs_info *get_regs_info () override;
	32
	33	int breakpoint_kind_from_pc (CORE_ADDR *pcptr) override;
	34
	35	const gdb_byte sw_breakpoint_from_kind (int kind, int size) override;
	36
	37	protected:
	38
	39	void low_arch_setup () override;
	40
	41	bool low_cannot_fetch_register (int regno) override;
	42
	43	bool low_cannot_store_register (int regno) override;
	44
	45	bool low_fetch_register (regcache *regcache, int regno) override;
	46
	47	bool low_supports_breakpoints () override;
	48
	49	CORE_ADDR low_get_pc (regcache *regcache) override;
	50
	51	void low_set_pc (regcache *regcache, CORE_ADDR newpc) override;
	52
	53	bool low_breakpoint_at (CORE_ADDR pc) override;
	54	};
	55
	56	/* The singleton target ops object. */
	57
	58	static loongarch_target the_loongarch_target;
	59
	60	bool
	61	loongarch_target::low_cannot_fetch_register (int regno)
	62	{
	63	gdb_assert_not_reached ("linux target op low_cannot_fetch_register "
	64	"is not implemented by the target");
	65	}
	66
	67	bool
	68	loongarch_target::low_cannot_store_register (int regno)
	69	{
	70	gdb_assert_not_reached ("linux target op low_cannot_store_register "
	71	"is not implemented by the target");
	72	}
	73
	74	/* Implementation of linux target ops method "low_arch_setup". */
	75
	76	void
	77	loongarch_target::low_arch_setup ()
	78	{
	79	static const char *expedite_regs[] = { "r3", "pc", NULL };
	80	loongarch_gdbarch_features features;
	81	target_desc_up tdesc;
	82
	83	features.xlen = sizeof (elf_greg_t);
84	tdesc = loongarch_create_target_description (features);
85
dd6a9ec1 AB	86	if (tdesc->expedite_regs.empty ())
	87	{
	88	init_target_desc (tdesc.get (), expedite_regs);
	89	gdb_assert (!tdesc->expedite_regs.empty ());
	90	}
e5ab6af5 YT	91	current_process ()->tdesc = tdesc.release ();
	92	}
	93
	94	/* Collect GPRs from REGCACHE into BUF. */
	95
	96	static void
	97	loongarch_fill_gregset (struct regcache regcache, void buf)
	98	{
e5ab6af5	99	elf_gregset_t regset = (elf_gregset_t ) buf;
e5ab6af5 YT	100	int i;
	101
	102	for (i = 1; i < 32; i++)
3eba4833	103	collect_register (regcache, i, *regset + i);
74baa6cd	104	collect_register (regcache, LOONGARCH_ORIG_A0_REGNUM, *regset + LOONGARCH_ORIG_A0_REGNUM);
3eba4833 YT	105	collect_register (regcache, LOONGARCH_PC_REGNUM, *regset + LOONGARCH_PC_REGNUM);
3eba4833 YT	106	collect_register (regcache, LOONGARCH_BADV_REGNUM, *regset + LOONGARCH_BADV_REGNUM);
e5ab6af5 YT	107	}
	108
	109	/* Supply GPRs from BUF into REGCACHE. */
	110
	111	static void
	112	loongarch_store_gregset (struct regcache regcache, const void buf)
	113	{
e5ab6af5	114	const elf_gregset_t regset = (const elf_gregset_t ) buf;
e5ab6af5 YT	115	int i;
e5ab6af5 YT	116
3eba4833	117	supply_register_zeroed (regcache, 0);
e5ab6af5	118	for (i = 1; i < 32; i++)
3eba4833	119	supply_register (regcache, i, *regset + i);
74baa6cd	120	supply_register (regcache, LOONGARCH_ORIG_A0_REGNUM, *regset + LOONGARCH_ORIG_A0_REGNUM);
3eba4833 YT	121	supply_register (regcache, LOONGARCH_PC_REGNUM, *regset + LOONGARCH_PC_REGNUM);
3eba4833 YT	122	supply_register (regcache, LOONGARCH_BADV_REGNUM, *regset + LOONGARCH_BADV_REGNUM);
e5ab6af5 YT	123	}
e5ab6af5 YT	124
3f6227c2 TY	125	/* Collect FPRs from REGCACHE into BUF. */
	126
	127	static void
	128	loongarch_fill_fpregset (struct regcache regcache, void buf)
	129	{
	130	gdb_byte *regbuf = nullptr;
	131	int fprsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FP_REGNUM);
ea335217	132	int fccsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FCC_REGNUM);
3f6227c2 TY	133
	134	for (int i = 0; i < LOONGARCH_LINUX_NUM_FPREGSET; i++)
	135	{
	136	regbuf = (gdb_byte )buf + fprsize i;
	137	collect_register (regcache, LOONGARCH_FIRST_FP_REGNUM + i, regbuf);
	138	}
ea335217 FC	139
	140	for (int i = 0; i < LOONGARCH_LINUX_NUM_FCC; i++)
	141	{
	142	regbuf = (gdb_byte )buf + fprsize LOONGARCH_LINUX_NUM_FPREGSET +
	143	fccsize * i;
	144	collect_register (regcache, LOONGARCH_FIRST_FCC_REGNUM + i, regbuf);
	145	}
	146
	147	regbuf = (gdb_byte )buf + fprsize LOONGARCH_LINUX_NUM_FPREGSET +
	148	fccsize * LOONGARCH_LINUX_NUM_FCC;
	149	collect_register (regcache, LOONGARCH_FCSR_REGNUM, regbuf);
3f6227c2 TY	150	}
	151
	152	/* Supply FPRs from BUF into REGCACHE. */
	153
	154	static void
	155	loongarch_store_fpregset (struct regcache regcache, const void buf)
	156	{
	157	const gdb_byte *regbuf = nullptr;
	158	int fprsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FP_REGNUM);
ea335217	159	int fccsize = register_size (regcache->tdesc, LOONGARCH_FIRST_FCC_REGNUM);
3f6227c2 TY	160
	161	for (int i = 0; i < LOONGARCH_LINUX_NUM_FPREGSET; i++)
	162	{
	163	regbuf = (const gdb_byte )buf + fprsize i;
	164	supply_register (regcache, LOONGARCH_FIRST_FP_REGNUM + i, regbuf);
	165	}
ea335217 FC	166
	167	for (int i = 0; i < LOONGARCH_LINUX_NUM_FCC; i++)
	168	{
	169	regbuf = (const gdb_byte )buf + fprsize LOONGARCH_LINUX_NUM_FPREGSET +
	170	fccsize * i;
	171	supply_register (regcache, LOONGARCH_FIRST_FCC_REGNUM + i, regbuf);
	172	}
	173
	174	regbuf = (const gdb_byte )buf + fprsize LOONGARCH_LINUX_NUM_FPREGSET +
	175	fccsize * LOONGARCH_LINUX_NUM_FCC;
	176	supply_register (regcache, LOONGARCH_FCSR_REGNUM, regbuf);
3f6227c2 TY	177	}
3f6227c2 TY	178
1e9569f3 HL	179	/* Collect lsx regs from REGCACHE into BUF. */
	180
	181	static void
	182	loongarch_fill_lsxregset (struct regcache regcache, void buf)
	183	{
	184	elf_lsxregset_t regset = (elf_lsxregset_t ) buf;
	185	int i;
	186
	187	for (i = 0; i < LOONGARCH_LINUX_NUM_LSXREGSET; i++)
	188	collect_register (regcache, LOONGARCH_FIRST_LSX_REGNUM + i, *regset + i);
	189	}
	190
	191	/* Supply lsx regs from BUF into REGCACHE. */
	192
	193	static void
	194	loongarch_store_lsxregset (struct regcache regcache, const void buf)
	195	{
	196	const elf_lsxregset_t regset = (const elf_lsxregset_t ) buf;
	197	int i;
	198
	199	for (i = 0; i < LOONGARCH_LINUX_NUM_LSXREGSET; i++)
	200	supply_register (regcache, LOONGARCH_FIRST_LSX_REGNUM + i, *regset + i);
	201	}
	202
	203	/* Collect lasx regs from REGCACHE into BUF. */
	204
	205	static void
	206	loongarch_fill_lasxregset (struct regcache regcache, void buf)
	207	{
	208	elf_lasxregset_t regset = (elf_lasxregset_t ) buf;
	209	int i;
	210
	211	for (i = 0; i < LOONGARCH_LINUX_NUM_LASXREGSET; i++)
	212	collect_register (regcache, LOONGARCH_FIRST_LASX_REGNUM + i, *regset + i);
	213	}
	214
	215	/* Supply lasx regs from BUF into REGCACHE. */
	216
	217	static void
	218	loongarch_store_lasxregset (struct regcache regcache, const void buf)
	219	{
	220	const elf_lasxregset_t regset = (const elf_lasxregset_t ) buf;
	221	int i;
	222
	223	for (i = 0; i < LOONGARCH_LINUX_NUM_LASXREGSET; i++)
	224	supply_register (regcache, LOONGARCH_FIRST_LASX_REGNUM + i, *regset + i);
	225	}
	226
e4d74c01 FC	227	/* Collect lbt regs from REGCACHE into BUF. */
	228
	229	static void
	230	loongarch_fill_lbtregset (struct regcache regcache, void buf)
	231	{
	232	gdb_byte regbuf = (gdb_byte)buf;
	233	int scrsize = register_size (regcache->tdesc, LOONGARCH_FIRST_SCR_REGNUM);
	234	int eflagssize = register_size (regcache->tdesc, LOONGARCH_EFLAGS_REGNUM);
	235	int i;
	236
	237	for (i = 0; i < LOONGARCH_LINUX_NUM_SCR; i++)
	238	collect_register (regcache, LOONGARCH_FIRST_SCR_REGNUM + i, regbuf + scrsize * i);
	239
	240	collect_register (regcache, LOONGARCH_EFLAGS_REGNUM,
	241	regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize);
	242	collect_register (regcache, LOONGARCH_FTOP_REGNUM,
	243	regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize + eflagssize);
	244
	245	}
	246
	247	/* Supply lbt regs from BUF into REGCACHE. */
	248
	249	static void
	250	loongarch_store_lbtregset (struct regcache regcache, const void buf)
	251	{
	252
	253	gdb_byte regbuf = (gdb_byte)buf;
	254	int scrsize = register_size (regcache->tdesc, LOONGARCH_FIRST_SCR_REGNUM);
	255	int eflagssize = register_size (regcache->tdesc, LOONGARCH_EFLAGS_REGNUM);
	256	int i;
	257
	258	for (i = 0; i < LOONGARCH_LINUX_NUM_SCR; i++)
	259	supply_register (regcache, LOONGARCH_FIRST_SCR_REGNUM + i, regbuf + scrsize * i);
	260
	261	supply_register (regcache, LOONGARCH_EFLAGS_REGNUM,
	262	regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize);
	263	supply_register (regcache, LOONGARCH_FTOP_REGNUM,
	264	regbuf + LOONGARCH_LINUX_NUM_SCR * scrsize + eflagssize);
	265
	266	}
	267
e5ab6af5 YT	268	/* LoongArch/Linux regsets. */
	269	static struct regset_info loongarch_regsets[] = {
	270	{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_PRSTATUS, sizeof (elf_gregset_t),
	271	GENERAL_REGS, loongarch_fill_gregset, loongarch_store_gregset },
3f6227c2 TY	272	{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_FPREGSET, sizeof (elf_fpregset_t),
3f6227c2 TY	273	FP_REGS, loongarch_fill_fpregset, loongarch_store_fpregset },
1e9569f3 HL	274	{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_LARCH_LSX, sizeof (elf_lsxregset_t),
	275	OPTIONAL_REGS, loongarch_fill_lsxregset, loongarch_store_lsxregset },
	276	{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_LARCH_LASX, sizeof (elf_lasxregset_t),
	277	OPTIONAL_REGS, loongarch_fill_lasxregset, loongarch_store_lasxregset },
e4d74c01 FC	278	{ PTRACE_GETREGSET, PTRACE_SETREGSET, NT_LARCH_LBT, LOONGARCH_LBT_REGS_SIZE,
e4d74c01 FC	279	OPTIONAL_REGS, loongarch_fill_lbtregset, loongarch_store_lbtregset },
e5ab6af5 YT	280	NULL_REGSET
	281	};
	282
	283	/* LoongArch/Linux regset information. */
	284	static struct regsets_info loongarch_regsets_info =
	285	{
	286	loongarch_regsets, /* regsets */
	287	0, /* num_regsets */
	288	NULL, /* disabled_regsets */
	289	};
	290
	291	/* Definition of linux_target_ops data member "regs_info". */
	292	static struct regs_info loongarch_regs =
	293	{
	294	NULL, /* regset_bitmap */
	295	NULL, /* usrregs */
	296	&loongarch_regsets_info,
	297	};
	298
	299	/* Implementation of linux target ops method "get_regs_info". */
	300
	301	const regs_info *
	302	loongarch_target::get_regs_info ()
	303	{
	304	return &loongarch_regs;
	305	}
	306
	307	/* Implementation of linux target ops method "low_fetch_register". */
	308
	309	bool
	310	loongarch_target::low_fetch_register (regcache *regcache, int regno)
	311	{
3eba4833	312	if (regno != 0)
e5ab6af5	313	return false;
3eba4833	314	supply_register_zeroed (regcache, 0);
e5ab6af5 YT	315	return true;
	316	}
	317
	318	bool
	319	loongarch_target::low_supports_breakpoints ()
	320	{
	321	return true;
	322	}
	323
	324	/* Implementation of linux target ops method "low_get_pc". */
	325
	326	CORE_ADDR
	327	loongarch_target::low_get_pc (regcache *regcache)
	328	{
	329	if (register_size (regcache->tdesc, 0) == 8)
	330	return linux_get_pc_64bit (regcache);
	331	else
	332	return linux_get_pc_32bit (regcache);
	333	}
	334
	335	/* Implementation of linux target ops method "low_set_pc". */
	336
	337	void
	338	loongarch_target::low_set_pc (regcache *regcache, CORE_ADDR newpc)
	339	{
	340	if (register_size (regcache->tdesc, 0) == 8)
	341	linux_set_pc_64bit (regcache, newpc);
	342	else
	343	linux_set_pc_32bit (regcache, newpc);
	344	}
	345
	346	#define loongarch_breakpoint_len 4
	347
	348	/* LoongArch BRK software debug mode instruction.
	349	This instruction needs to match gdb/loongarch-tdep.c
	350	(loongarch_default_breakpoint). */
	351	static const gdb_byte loongarch_breakpoint[] = {0x05, 0x00, 0x2a, 0x00};
	352
	353	/* Implementation of target ops method "breakpoint_kind_from_pc". */
	354
	355	int
	356	loongarch_target::breakpoint_kind_from_pc (CORE_ADDR *pcptr)
	357	{
	358	return loongarch_breakpoint_len;
	359	}
	360
	361	/* Implementation of target ops method "sw_breakpoint_from_kind". */
	362
	363	const gdb_byte *
	364	loongarch_target::sw_breakpoint_from_kind (int kind, int *size)
	365	{
	366	*size = loongarch_breakpoint_len;
	367	return (const gdb_byte *) &loongarch_breakpoint;
	368	}
	369
	370	/* Implementation of linux target ops method "low_breakpoint_at". */
	371
	372	bool
	373	loongarch_target::low_breakpoint_at (CORE_ADDR pc)
	374	{
	375	gdb_byte insn[loongarch_breakpoint_len];
	376
	377	read_memory (pc, (unsigned char *) &insn, loongarch_breakpoint_len);
	378	if (memcmp (insn, loongarch_breakpoint, loongarch_breakpoint_len) == 0)
379	return true;
380
381	return false;
382	}
383
384	/* The linux target ops object. */
385
386	linux_process_target *the_linux_target = &the_loongarch_target;
387
388	/* Initialize the LoongArch/Linux target. */
389
390	void
391	initialize_low_arch ()
392	{
393	initialize_regsets_info (&loongarch_regsets_info);
394	}