[deliverable/binutils-gdb.git] / gdb / mips-fbsd-tdep.c

/* Target-dependent code for FreeBSD/mips.

   Copyright (C) 2017-2018 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 "defs.h"
#include "osabi.h"
#include "regset.h"
#include "trad-frame.h"
#include "tramp-frame.h"

#include "fbsd-tdep.h"
#include "mips-tdep.h"
#include "mips-fbsd-tdep.h"

#include "solib-svr4.h"

/* Core file support. */

/* Number of registers in `struct reg' from <machine/reg.h>.  The
   first 38 follow the standard MIPS layout.  The 39th holds
   IC_INT_REG on RM7K and RM9K processors.  The 40th is a dummy for
   padding.  */
#define MIPS_FBSD_NUM_GREGS	40

/* Number of registers in `struct fpreg' from <machine/reg.h>.  The
   first 32 hold floating point registers.  33 holds the FSR.  The
   34th holds FIR on FreeBSD 12.0 and newer kernels.  On older kernels
   it was a zero-filled dummy for padding.  */
#define MIPS_FBSD_NUM_FPREGS	34

/* Supply a single register.  The register size might not match, so use
   regcache->raw_supply_integer ().  */

static void
mips_fbsd_supply_reg (struct regcache *regcache, int regnum, const void *addr,
		      size_t len)
{
  regcache->raw_supply_integer (regnum, (const gdb_byte *) addr, len, true);
}

/* Collect a single register.  The register size might not match, so use
   regcache->raw_collect_integer ().  */

static void
mips_fbsd_collect_reg (const struct regcache *regcache, int regnum, void *addr,
		       size_t len)
{
  regcache->raw_collect_integer (regnum, (gdb_byte *) addr, len, true);
}

/* Supply the floating-point registers stored in FPREGS to REGCACHE.
   Each floating-point register in FPREGS is REGSIZE bytes in
   length.  */

void
mips_fbsd_supply_fpregs (struct regcache *regcache, int regnum,
			 const void *fpregs, size_t regsize)
{
  struct gdbarch *gdbarch = regcache->arch ();
  const gdb_byte *regs = (const gdb_byte *) fpregs;
  int i, fp0num;

  fp0num = mips_regnum (gdbarch)->fp0;
  for (i = 0; i <= 32; i++)
    if (regnum == fp0num + i || regnum == -1)
      mips_fbsd_supply_reg (regcache, fp0num + i,
			    regs + i * regsize, regsize);
  if (regnum == mips_regnum (gdbarch)->fp_control_status || regnum == -1)
    mips_fbsd_supply_reg (regcache, mips_regnum (gdbarch)->fp_control_status,
			  regs + 32 * regsize, regsize);
  if ((regnum == mips_regnum (gdbarch)->fp_implementation_revision
       || regnum == -1)
      && extract_unsigned_integer (regs + 33 * regsize, regsize,
				   gdbarch_byte_order (gdbarch)) != 0)
    mips_fbsd_supply_reg (regcache,
			  mips_regnum (gdbarch)->fp_implementation_revision,
			  regs + 33 * regsize, regsize);
}

/* Supply the general-purpose registers stored in GREGS to REGCACHE.
   Each general-purpose register in GREGS is REGSIZE bytes in
   length.  */

void
mips_fbsd_supply_gregs (struct regcache *regcache, int regnum,
			const void *gregs, size_t regsize)
{
  struct gdbarch *gdbarch = regcache->arch ();
  const gdb_byte *regs = (const gdb_byte *) gregs;
  int i;

  for (i = 0; i <= mips_regnum (gdbarch)->pc; i++)
    if (regnum == i || regnum == -1)
      mips_fbsd_supply_reg (regcache, i, regs + i * regsize, regsize);
}

/* Collect the floating-point registers from REGCACHE and store them
   in FPREGS.  Each floating-point register in FPREGS is REGSIZE bytes
   in length.  */

void
mips_fbsd_collect_fpregs (const struct regcache *regcache, int regnum,
			  void *fpregs, size_t regsize)
{
  struct gdbarch *gdbarch = regcache->arch ();
  gdb_byte *regs = (gdb_byte *) fpregs;
  int i, fp0num;

  fp0num = mips_regnum (gdbarch)->fp0;
  for (i = 0; i < 32; i++)
    if (regnum == fp0num + i || regnum == -1)
      mips_fbsd_collect_reg (regcache, fp0num + i,
			     regs + i * regsize, regsize);
  if (regnum == mips_regnum (gdbarch)->fp_control_status || regnum == -1)
    mips_fbsd_collect_reg (regcache, mips_regnum (gdbarch)->fp_control_status,
			   regs + 32 * regsize, regsize);
  if (regnum == mips_regnum (gdbarch)->fp_implementation_revision
      || regnum == -1)
    mips_fbsd_collect_reg (regcache,
			   mips_regnum (gdbarch)->fp_implementation_revision,
			   regs + 33 * regsize, regsize);
}

/* Collect the general-purpose registers from REGCACHE and store them
   in GREGS.  Each general-purpose register in GREGS is REGSIZE bytes
   in length.  */

void
mips_fbsd_collect_gregs (const struct regcache *regcache, int regnum,
			 void *gregs, size_t regsize)
{
  struct gdbarch *gdbarch = regcache->arch ();
  gdb_byte *regs = (gdb_byte *) gregs;
  int i;

  for (i = 0; i <= mips_regnum (gdbarch)->pc; i++)
    if (regnum == i || regnum == -1)
      mips_fbsd_collect_reg (regcache, i, regs + i * regsize, regsize);
}

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

static void
mips_fbsd_supply_fpregset (const struct regset *regset,
			   struct regcache *regcache,
			   int regnum, const void *fpregs, size_t len)
{
  size_t regsize = mips_abi_regsize (regcache->arch ());

  gdb_assert (len >= MIPS_FBSD_NUM_FPREGS * regsize);

  mips_fbsd_supply_fpregs (regcache, regnum, fpregs, regsize);
}

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

static void
mips_fbsd_collect_fpregset (const struct regset *regset,
			    const struct regcache *regcache,
			    int regnum, void *fpregs, size_t len)
{
  size_t regsize = mips_abi_regsize (regcache->arch ());

  gdb_assert (len >= MIPS_FBSD_NUM_FPREGS * regsize);

  mips_fbsd_collect_fpregs (regcache, regnum, fpregs, regsize);
}

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

static void
mips_fbsd_supply_gregset (const struct regset *regset,
			  struct regcache *regcache, int regnum,
			  const void *gregs, size_t len)
{
  size_t regsize = mips_abi_regsize (regcache->arch ());

  gdb_assert (len >= MIPS_FBSD_NUM_GREGS * regsize);

  mips_fbsd_supply_gregs (regcache, regnum, gregs, regsize);
}

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

static void
mips_fbsd_collect_gregset (const struct regset *regset,
			   const struct regcache *regcache,
			   int regnum, void *gregs, size_t len)
{
  size_t regsize = mips_abi_regsize (regcache->arch ());

  gdb_assert (len >= MIPS_FBSD_NUM_GREGS * regsize);

  mips_fbsd_collect_gregs (regcache, regnum, gregs, regsize);
}

/* FreeBSD/mips register sets.  */

static const struct regset mips_fbsd_gregset =
{
  NULL,
  mips_fbsd_supply_gregset,
  mips_fbsd_collect_gregset,
};

static const struct regset mips_fbsd_fpregset =
{
  NULL,
  mips_fbsd_supply_fpregset,
  mips_fbsd_collect_fpregset,
};

/* Iterate over core file register note sections.  */

static void
mips_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
					iterate_over_regset_sections_cb *cb,
					void *cb_data,
					const struct regcache *regcache)
{
  size_t regsize = mips_abi_regsize (gdbarch);

  cb (".reg", MIPS_FBSD_NUM_GREGS * regsize, &mips_fbsd_gregset,
      NULL, cb_data);
  cb (".reg2", MIPS_FBSD_NUM_FPREGS * regsize, &mips_fbsd_fpregset,
      NULL, cb_data);
}

/* Signal trampoline support.  */

#define FBSD_SYS_sigreturn	417

#define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + FBSD_SYS_sigreturn
#define MIPS_INST_SYSCALL	0x0000000c
#define MIPS_INST_BREAK		0x0000000d

#define O32_SIGFRAME_UCONTEXT_OFFSET	(16)
#define O32_SIGSET_T_SIZE	(16)

#define O32_UCONTEXT_ONSTACK	(O32_SIGSET_T_SIZE)
#define O32_UCONTEXT_PC		(O32_UCONTEXT_ONSTACK + 4)
#define O32_UCONTEXT_REGS	(O32_UCONTEXT_PC + 4)
#define O32_UCONTEXT_SR		(O32_UCONTEXT_REGS + 4 * 32)
#define O32_UCONTEXT_LO		(O32_UCONTEXT_SR + 4)
#define O32_UCONTEXT_HI		(O32_UCONTEXT_LO + 4)
#define O32_UCONTEXT_FPUSED	(O32_UCONTEXT_HI + 4)
#define O32_UCONTEXT_FPREGS	(O32_UCONTEXT_FPUSED + 4)

#define O32_UCONTEXT_REG_SIZE	4

static void
mips_fbsd_sigframe_init (const struct tramp_frame *self,
			 struct frame_info *this_frame,
			 struct trad_frame_cache *cache,
			 CORE_ADDR func)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  CORE_ADDR sp, ucontext_addr, addr;
  int regnum;
  gdb_byte buf[4];

  /* We find the appropriate instance of `ucontext_t' at a
     fixed offset in the signal frame.  */
  sp = get_frame_register_signed (this_frame,
				  MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
  ucontext_addr = sp + O32_SIGFRAME_UCONTEXT_OFFSET;

  /* PC.  */
  regnum = mips_regnum (gdbarch)->pc;
  trad_frame_set_reg_addr (cache,
			   regnum + gdbarch_num_regs (gdbarch),
			   ucontext_addr + O32_UCONTEXT_PC);

  /* GPRs.  */
  for (regnum = MIPS_ZERO_REGNUM, addr = ucontext_addr + O32_UCONTEXT_REGS;
       regnum <= MIPS_RA_REGNUM; regnum++, addr += O32_UCONTEXT_REG_SIZE)
    trad_frame_set_reg_addr (cache,
			     regnum + gdbarch_num_regs (gdbarch),
			     addr);

  regnum = MIPS_PS_REGNUM;
  trad_frame_set_reg_addr (cache,
			   regnum + gdbarch_num_regs (gdbarch),
			   ucontext_addr + O32_UCONTEXT_SR);

  /* HI and LO.  */
  regnum = mips_regnum (gdbarch)->lo;
  trad_frame_set_reg_addr (cache,
			   regnum + gdbarch_num_regs (gdbarch),
			   ucontext_addr + O32_UCONTEXT_LO);
  regnum = mips_regnum (gdbarch)->hi;
  trad_frame_set_reg_addr (cache,
			   regnum + gdbarch_num_regs (gdbarch),
			   ucontext_addr + O32_UCONTEXT_HI);

  if (target_read_memory (ucontext_addr + O32_UCONTEXT_FPUSED, buf, 4) == 0
      && extract_unsigned_integer (buf, 4, byte_order) != 0)
    {
      for (regnum = 0, addr = ucontext_addr + O32_UCONTEXT_FPREGS;
	   regnum < 32; regnum++, addr += O32_UCONTEXT_REG_SIZE)
	trad_frame_set_reg_addr (cache,
				 regnum + gdbarch_fp0_regnum (gdbarch),
				 addr);
      trad_frame_set_reg_addr (cache, mips_regnum (gdbarch)->fp_control_status,
			       addr);
    }

  trad_frame_set_id (cache, frame_id_build (sp, func));
}

#define MIPS_INST_ADDIU_A0_SP_O32 (0x27a40000 \
				   + O32_SIGFRAME_UCONTEXT_OFFSET)

static const struct tramp_frame mips_fbsd_sigframe =
{
  SIGTRAMP_FRAME,
  MIPS_INSN32_SIZE,
  {
    { MIPS_INST_ADDIU_A0_SP_O32, -1 },	/* addiu   a0, sp, SIGF_UC */
    { MIPS_INST_LI_V0_SIGRETURN, -1 },	/* li      v0, SYS_sigreturn */
    { MIPS_INST_SYSCALL, -1 },		/* syscall */
    { MIPS_INST_BREAK, -1 },		/* break */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  mips_fbsd_sigframe_init
};

#define N64_SIGFRAME_UCONTEXT_OFFSET	(32)
#define N64_SIGSET_T_SIZE	(16)

#define N64_UCONTEXT_ONSTACK	(N64_SIGSET_T_SIZE)
#define N64_UCONTEXT_PC		(N64_UCONTEXT_ONSTACK + 8)
#define N64_UCONTEXT_REGS	(N64_UCONTEXT_PC + 8)
#define N64_UCONTEXT_SR		(N64_UCONTEXT_REGS + 8 * 32)
#define N64_UCONTEXT_LO		(N64_UCONTEXT_SR + 8)
#define N64_UCONTEXT_HI		(N64_UCONTEXT_LO + 8)
#define N64_UCONTEXT_FPUSED	(N64_UCONTEXT_HI + 8)
#define N64_UCONTEXT_FPREGS	(N64_UCONTEXT_FPUSED + 8)

#define N64_UCONTEXT_REG_SIZE	8

static void
mips64_fbsd_sigframe_init (const struct tramp_frame *self,
			   struct frame_info *this_frame,
			   struct trad_frame_cache *cache,
			   CORE_ADDR func)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  CORE_ADDR sp, ucontext_addr, addr;
  int regnum;
  gdb_byte buf[4];

  /* We find the appropriate instance of `ucontext_t' at a
     fixed offset in the signal frame.  */
  sp = get_frame_register_signed (this_frame,
				  MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
  ucontext_addr = sp + N64_SIGFRAME_UCONTEXT_OFFSET;

  /* PC.  */
  regnum = mips_regnum (gdbarch)->pc;
  trad_frame_set_reg_addr (cache,
			   regnum + gdbarch_num_regs (gdbarch),
			   ucontext_addr + N64_UCONTEXT_PC);

  /* GPRs.  */
  for (regnum = MIPS_ZERO_REGNUM, addr = ucontext_addr + N64_UCONTEXT_REGS;
       regnum <= MIPS_RA_REGNUM; regnum++, addr += N64_UCONTEXT_REG_SIZE)
    trad_frame_set_reg_addr (cache,
			     regnum + gdbarch_num_regs (gdbarch),
			     addr);

  regnum = MIPS_PS_REGNUM;
  trad_frame_set_reg_addr (cache,
			   regnum + gdbarch_num_regs (gdbarch),
			   ucontext_addr + N64_UCONTEXT_SR);

  /* HI and LO.  */
  regnum = mips_regnum (gdbarch)->lo;
  trad_frame_set_reg_addr (cache,
			   regnum + gdbarch_num_regs (gdbarch),
			   ucontext_addr + N64_UCONTEXT_LO);
  regnum = mips_regnum (gdbarch)->hi;
  trad_frame_set_reg_addr (cache,
			   regnum + gdbarch_num_regs (gdbarch),
			   ucontext_addr + N64_UCONTEXT_HI);

  if (target_read_memory (ucontext_addr + N64_UCONTEXT_FPUSED, buf, 4) == 0
      && extract_unsigned_integer (buf, 4, byte_order) != 0)
    {
      for (regnum = 0, addr = ucontext_addr + N64_UCONTEXT_FPREGS;
	   regnum < 32; regnum++, addr += N64_UCONTEXT_REG_SIZE)
	trad_frame_set_reg_addr (cache,
				 regnum + gdbarch_fp0_regnum (gdbarch),
				 addr);
      trad_frame_set_reg_addr (cache, mips_regnum (gdbarch)->fp_control_status,
			       addr);
    }

  trad_frame_set_id (cache, frame_id_build (sp, func));
}

#define MIPS_INST_ADDIU_A0_SP_N32 (0x27a40000 \
				   + N64_SIGFRAME_UCONTEXT_OFFSET)

static const struct tramp_frame mipsn32_fbsd_sigframe =
{
  SIGTRAMP_FRAME,
  MIPS_INSN32_SIZE,
  {
    { MIPS_INST_ADDIU_A0_SP_N32, -1 },	/* addiu   a0, sp, SIGF_UC */
    { MIPS_INST_LI_V0_SIGRETURN, -1 },	/* li      v0, SYS_sigreturn */
    { MIPS_INST_SYSCALL, -1 },		/* syscall */
    { MIPS_INST_BREAK, -1 },		/* break */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  mips64_fbsd_sigframe_init
};

#define MIPS_INST_DADDIU_A0_SP_N64 (0x67a40000 \
				    + N64_SIGFRAME_UCONTEXT_OFFSET)

static const struct tramp_frame mips64_fbsd_sigframe =
{
  SIGTRAMP_FRAME,
  MIPS_INSN32_SIZE,
  {
    { MIPS_INST_DADDIU_A0_SP_N64, -1 },	/* daddiu  a0, sp, SIGF_UC */
    { MIPS_INST_LI_V0_SIGRETURN, -1 },	/* li      v0, SYS_sigreturn */
    { MIPS_INST_SYSCALL, -1 },		/* syscall */
    { MIPS_INST_BREAK, -1 },		/* break */
    { TRAMP_SENTINEL_INSN, -1 }
  },
  mips64_fbsd_sigframe_init
};

/* Shared library support.  */

/* FreeBSD/mips uses a slightly different `struct link_map' than the
   other FreeBSD platforms as it includes an additional `l_off'
   member.  */

static struct link_map_offsets *
mips_fbsd_ilp32_fetch_link_map_offsets (void)
{
  static struct link_map_offsets lmo;
  static struct link_map_offsets *lmp = NULL;

  if (lmp == NULL)
    {
      lmp = &lmo;

      lmo.r_version_offset = 0;
      lmo.r_version_size = 4;
      lmo.r_map_offset = 4;
      lmo.r_brk_offset = 8;
      lmo.r_ldsomap_offset = -1;

      lmo.link_map_size = 24;
      lmo.l_addr_offset = 0;
      lmo.l_name_offset = 8;
      lmo.l_ld_offset = 12;
      lmo.l_next_offset = 16;
      lmo.l_prev_offset = 20;
    }

  return lmp;
}

static struct link_map_offsets *
mips_fbsd_lp64_fetch_link_map_offsets (void)
{
  static struct link_map_offsets lmo;
  static struct link_map_offsets *lmp = NULL;

  if (lmp == NULL)
    {
      lmp = &lmo;

      lmo.r_version_offset = 0;
      lmo.r_version_size = 4;
      lmo.r_map_offset = 8;
      lmo.r_brk_offset = 16;
      lmo.r_ldsomap_offset = -1;

      lmo.link_map_size = 48;
      lmo.l_addr_offset = 0;
      lmo.l_name_offset = 16;
      lmo.l_ld_offset = 24;
      lmo.l_next_offset = 32;
      lmo.l_prev_offset = 40;
    }

  return lmp;
}

static void
mips_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  enum mips_abi abi = mips_abi (gdbarch);

  /* Generic FreeBSD support.  */
  fbsd_init_abi (info, gdbarch);

  set_gdbarch_software_single_step (gdbarch, mips_software_single_step);

  switch (abi)
    {
      case MIPS_ABI_O32:
	tramp_frame_prepend_unwinder (gdbarch, &mips_fbsd_sigframe);
	break;
      case MIPS_ABI_N32:
	tramp_frame_prepend_unwinder (gdbarch, &mipsn32_fbsd_sigframe);
	break;
      case MIPS_ABI_N64:
	tramp_frame_prepend_unwinder (gdbarch, &mips64_fbsd_sigframe);
	break;
    }

  set_gdbarch_iterate_over_regset_sections
    (gdbarch, mips_fbsd_iterate_over_regset_sections);

  /* FreeBSD/mips has SVR4-style shared libraries.  */
  set_solib_svr4_fetch_link_map_offsets
    (gdbarch, (gdbarch_ptr_bit (gdbarch) == 32 ?
	       mips_fbsd_ilp32_fetch_link_map_offsets :
	       mips_fbsd_lp64_fetch_link_map_offsets));
}

void
_initialize_mips_fbsd_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_FREEBSD,
			  mips_fbsd_init_abi);
}
Commit	Line	Data
387360da JB	1	/* Target-dependent code for FreeBSD/mips.
387360da JB	2
e2882c85	3	Copyright (C) 2017-2018 Free Software Foundation, Inc.
387360da JB	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
	20	#include "defs.h"
	21	#include "osabi.h"
	22	#include "regset.h"
	23	#include "trad-frame.h"
	24	#include "tramp-frame.h"
	25
	26	#include "fbsd-tdep.h"
	27	#include "mips-tdep.h"
	28	#include "mips-fbsd-tdep.h"
	29
	30	#include "solib-svr4.h"
	31
387360da JB	32	/* Core file support. */
	33
	34	/* Number of registers in `struct reg' from <machine/reg.h>. The
	35	first 38 follow the standard MIPS layout. The 39th holds
	36	IC_INT_REG on RM7K and RM9K processors. The 40th is a dummy for
	37	padding. */
	38	#define MIPS_FBSD_NUM_GREGS 40
	39
	40	/* Number of registers in `struct fpreg' from <machine/reg.h>. The
	41	first 32 hold floating point registers. 33 holds the FSR. The
7755ddb7 JB	42	34th holds FIR on FreeBSD 12.0 and newer kernels. On older kernels
7755ddb7 JB	43	it was a zero-filled dummy for padding. */
387360da JB	44	#define MIPS_FBSD_NUM_FPREGS 34
387360da JB	45
b057297a AH	46	/* Supply a single register. The register size might not match, so use
b057297a AH	47	regcache->raw_supply_integer (). */
387360da JB	48
	49	static void
	50	mips_fbsd_supply_reg (struct regcache regcache, int regnum, const void addr,
	51	size_t len)
	52	{
b057297a	53	regcache->raw_supply_integer (regnum, (const gdb_byte *) addr, len, true);
387360da JB	54	}
387360da JB	55
b057297a AH	56	/* Collect a single register. The register size might not match, so use
b057297a AH	57	regcache->raw_collect_integer (). */
387360da JB	58
	59	static void
	60	mips_fbsd_collect_reg (const struct regcache regcache, int regnum, void addr,
	61	size_t len)
	62	{
b057297a	63	regcache->raw_collect_integer (regnum, (gdb_byte *) addr, len, true);
387360da JB	64	}
	65
	66	/* Supply the floating-point registers stored in FPREGS to REGCACHE.
	67	Each floating-point register in FPREGS is REGSIZE bytes in
	68	length. */
	69
	70	void
	71	mips_fbsd_supply_fpregs (struct regcache *regcache, int regnum,
	72	const void *fpregs, size_t regsize)
	73	{
ac7936df	74	struct gdbarch *gdbarch = regcache->arch ();
387360da	75	const gdb_byte regs = (const gdb_byte ) fpregs;
7755ddb7	76	int i, fp0num;
387360da	77
f7241d4f	78	fp0num = mips_regnum (gdbarch)->fp0;
7755ddb7 JB	79	for (i = 0; i <= 32; i++)
	80	if (regnum == fp0num + i \|\| regnum == -1)
	81	mips_fbsd_supply_reg (regcache, fp0num + i,
	82	regs + i * regsize, regsize);
	83	if (regnum == mips_regnum (gdbarch)->fp_control_status \|\| regnum == -1)
	84	mips_fbsd_supply_reg (regcache, mips_regnum (gdbarch)->fp_control_status,
	85	regs + 32 * regsize, regsize);
	86	if ((regnum == mips_regnum (gdbarch)->fp_implementation_revision
	87	\|\| regnum == -1)
	88	&& extract_unsigned_integer (regs + 33 * regsize, regsize,
	89	gdbarch_byte_order (gdbarch)) != 0)
	90	mips_fbsd_supply_reg (regcache,
	91	mips_regnum (gdbarch)->fp_implementation_revision,
	92	regs + 33 * regsize, regsize);
387360da JB	93	}
	94
	95	/* Supply the general-purpose registers stored in GREGS to REGCACHE.
	96	Each general-purpose register in GREGS is REGSIZE bytes in
	97	length. */
	98
	99	void
	100	mips_fbsd_supply_gregs (struct regcache *regcache, int regnum,
	101	const void *gregs, size_t regsize)
	102	{
ac7936df	103	struct gdbarch *gdbarch = regcache->arch ();
387360da JB	104	const gdb_byte regs = (const gdb_byte ) gregs;
	105	int i;
	106
f7241d4f	107	for (i = 0; i <= mips_regnum (gdbarch)->pc; i++)
387360da JB	108	if (regnum == i \|\| regnum == -1)
	109	mips_fbsd_supply_reg (regcache, i, regs + i * regsize, regsize);
	110	}
	111
	112	/* Collect the floating-point registers from REGCACHE and store them
	113	in FPREGS. Each floating-point register in FPREGS is REGSIZE bytes
	114	in length. */
	115
	116	void
	117	mips_fbsd_collect_fpregs (const struct regcache *regcache, int regnum,
	118	void *fpregs, size_t regsize)
	119	{
ac7936df	120	struct gdbarch *gdbarch = regcache->arch ();
387360da	121	gdb_byte regs = (gdb_byte ) fpregs;
7755ddb7	122	int i, fp0num;
387360da	123
f7241d4f	124	fp0num = mips_regnum (gdbarch)->fp0;
7755ddb7 JB	125	for (i = 0; i < 32; i++)
	126	if (regnum == fp0num + i \|\| regnum == -1)
	127	mips_fbsd_collect_reg (regcache, fp0num + i,
	128	regs + i * regsize, regsize);
	129	if (regnum == mips_regnum (gdbarch)->fp_control_status \|\| regnum == -1)
	130	mips_fbsd_collect_reg (regcache, mips_regnum (gdbarch)->fp_control_status,
	131	regs + 32 * regsize, regsize);
	132	if (regnum == mips_regnum (gdbarch)->fp_implementation_revision
	133	\|\| regnum == -1)
	134	mips_fbsd_collect_reg (regcache,
	135	mips_regnum (gdbarch)->fp_implementation_revision,
	136	regs + 33 * regsize, regsize);
387360da JB	137	}
	138
	139	/* Collect the general-purpose registers from REGCACHE and store them
	140	in GREGS. Each general-purpose register in GREGS is REGSIZE bytes
	141	in length. */
	142
	143	void
	144	mips_fbsd_collect_gregs (const struct regcache *regcache, int regnum,
	145	void *gregs, size_t regsize)
	146	{
ac7936df	147	struct gdbarch *gdbarch = regcache->arch ();
387360da JB	148	gdb_byte regs = (gdb_byte ) gregs;
	149	int i;
	150
f7241d4f	151	for (i = 0; i <= mips_regnum (gdbarch)->pc; i++)
387360da JB	152	if (regnum == i \|\| regnum == -1)
	153	mips_fbsd_collect_reg (regcache, i, regs + i * regsize, regsize);
	154	}
	155
	156	/* Supply register REGNUM from the buffer specified by FPREGS and LEN
	157	in the floating-point register set REGSET to register cache
	158	REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
	159
	160	static void
	161	mips_fbsd_supply_fpregset (const struct regset *regset,
	162	struct regcache *regcache,
	163	int regnum, const void *fpregs, size_t len)
	164	{
ac7936df	165	size_t regsize = mips_abi_regsize (regcache->arch ());
387360da JB	166
	167	gdb_assert (len >= MIPS_FBSD_NUM_FPREGS * regsize);
	168
	169	mips_fbsd_supply_fpregs (regcache, regnum, fpregs, regsize);
	170	}
	171
	172	/* Collect register REGNUM from the register cache REGCACHE and store
	173	it in the buffer specified by FPREGS and LEN in the floating-point
	174	register set REGSET. If REGNUM is -1, do this for all registers in
	175	REGSET. */
	176
	177	static void
	178	mips_fbsd_collect_fpregset (const struct regset *regset,
	179	const struct regcache *regcache,
	180	int regnum, void *fpregs, size_t len)
	181	{
ac7936df	182	size_t regsize = mips_abi_regsize (regcache->arch ());
387360da JB	183
	184	gdb_assert (len >= MIPS_FBSD_NUM_FPREGS * regsize);
	185
	186	mips_fbsd_collect_fpregs (regcache, regnum, fpregs, regsize);
	187	}
	188
	189	/* Supply register REGNUM from the buffer specified by GREGS and LEN
	190	in the general-purpose register set REGSET to register cache
	191	REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
	192
	193	static void
	194	mips_fbsd_supply_gregset (const struct regset *regset,
	195	struct regcache *regcache, int regnum,
	196	const void *gregs, size_t len)
	197	{
ac7936df	198	size_t regsize = mips_abi_regsize (regcache->arch ());
387360da JB	199
	200	gdb_assert (len >= MIPS_FBSD_NUM_GREGS * regsize);
	201
	202	mips_fbsd_supply_gregs (regcache, regnum, gregs, regsize);
	203	}
	204
	205	/* Collect register REGNUM from the register cache REGCACHE and store
	206	it in the buffer specified by GREGS and LEN in the general-purpose
	207	register set REGSET. If REGNUM is -1, do this for all registers in
	208	REGSET. */
	209
	210	static void
	211	mips_fbsd_collect_gregset (const struct regset *regset,
	212	const struct regcache *regcache,
	213	int regnum, void *gregs, size_t len)
	214	{
ac7936df	215	size_t regsize = mips_abi_regsize (regcache->arch ());
387360da JB	216
	217	gdb_assert (len >= MIPS_FBSD_NUM_GREGS * regsize);
	218
	219	mips_fbsd_collect_gregs (regcache, regnum, gregs, regsize);
	220	}
	221
	222	/* FreeBSD/mips register sets. */
	223
	224	static const struct regset mips_fbsd_gregset =
	225	{
	226	NULL,
	227	mips_fbsd_supply_gregset,
	228	mips_fbsd_collect_gregset,
	229	};
	230
	231	static const struct regset mips_fbsd_fpregset =
	232	{
	233	NULL,
	234	mips_fbsd_supply_fpregset,
	235	mips_fbsd_collect_fpregset,
	236	};
	237
	238	/* Iterate over core file register note sections. */
	239
	240	static void
	241	mips_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
	242	iterate_over_regset_sections_cb *cb,
	243	void *cb_data,
	244	const struct regcache *regcache)
	245	{
	246	size_t regsize = mips_abi_regsize (gdbarch);
	247
	248	cb (".reg", MIPS_FBSD_NUM_GREGS * regsize, &mips_fbsd_gregset,
	249	NULL, cb_data);
	250	cb (".reg2", MIPS_FBSD_NUM_FPREGS * regsize, &mips_fbsd_fpregset,
	251	NULL, cb_data);
	252	}
	253
	254	/* Signal trampoline support. */
	255
	256	#define FBSD_SYS_sigreturn 417
	257
	258	#define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + FBSD_SYS_sigreturn
	259	#define MIPS_INST_SYSCALL 0x0000000c
	260	#define MIPS_INST_BREAK 0x0000000d
	261
	262	#define O32_SIGFRAME_UCONTEXT_OFFSET (16)
	263	#define O32_SIGSET_T_SIZE (16)
	264
	265	#define O32_UCONTEXT_ONSTACK (O32_SIGSET_T_SIZE)
	266	#define O32_UCONTEXT_PC (O32_UCONTEXT_ONSTACK + 4)
	267	#define O32_UCONTEXT_REGS (O32_UCONTEXT_PC + 4)
	268	#define O32_UCONTEXT_SR (O32_UCONTEXT_REGS + 4 * 32)
	269	#define O32_UCONTEXT_LO (O32_UCONTEXT_SR + 4)
	270	#define O32_UCONTEXT_HI (O32_UCONTEXT_LO + 4)
	271	#define O32_UCONTEXT_FPUSED (O32_UCONTEXT_HI + 4)
	272	#define O32_UCONTEXT_FPREGS (O32_UCONTEXT_FPUSED + 4)
	273
	274	#define O32_UCONTEXT_REG_SIZE 4
	275
	276	static void
	277	mips_fbsd_sigframe_init (const struct tramp_frame *self,
	278	struct frame_info *this_frame,
	279	struct trad_frame_cache *cache,
280	CORE_ADDR func)
281	{
282	struct gdbarch *gdbarch = get_frame_arch (this_frame);
283	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
284	CORE_ADDR sp, ucontext_addr, addr;
285	int regnum;
286	gdb_byte buf[4];
287
288	/* We find the appropriate instance of `ucontext_t' at a
289	fixed offset in the signal frame. */
290	sp = get_frame_register_signed (this_frame,
291	MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
292	ucontext_addr = sp + O32_SIGFRAME_UCONTEXT_OFFSET;
293
294	/* PC. */
295	regnum = mips_regnum (gdbarch)->pc;
296	trad_frame_set_reg_addr (cache,
297	regnum + gdbarch_num_regs (gdbarch),
298	ucontext_addr + O32_UCONTEXT_PC);
299
300	/* GPRs. */
301	for (regnum = MIPS_ZERO_REGNUM, addr = ucontext_addr + O32_UCONTEXT_REGS;
302	regnum <= MIPS_RA_REGNUM; regnum++, addr += O32_UCONTEXT_REG_SIZE)
303	trad_frame_set_reg_addr (cache,
304	regnum + gdbarch_num_regs (gdbarch),
305	addr);
306
307	regnum = MIPS_PS_REGNUM;
308	trad_frame_set_reg_addr (cache,
309	regnum + gdbarch_num_regs (gdbarch),
310	ucontext_addr + O32_UCONTEXT_SR);
311
312	/* HI and LO. */
313	regnum = mips_regnum (gdbarch)->lo;
314	trad_frame_set_reg_addr (cache,
315	regnum + gdbarch_num_regs (gdbarch),
316	ucontext_addr + O32_UCONTEXT_LO);
317	regnum = mips_regnum (gdbarch)->hi;
318	trad_frame_set_reg_addr (cache,
319	regnum + gdbarch_num_regs (gdbarch),
320	ucontext_addr + O32_UCONTEXT_HI);
321
1c33cd7f YQ	322	if (target_read_memory (ucontext_addr + O32_UCONTEXT_FPUSED, buf, 4) == 0
1c33cd7f YQ	323	&& extract_unsigned_integer (buf, 4, byte_order) != 0)
387360da JB	324	{
	325	for (regnum = 0, addr = ucontext_addr + O32_UCONTEXT_FPREGS;
	326	regnum < 32; regnum++, addr += O32_UCONTEXT_REG_SIZE)
	327	trad_frame_set_reg_addr (cache,
	328	regnum + gdbarch_fp0_regnum (gdbarch),
	329	addr);
	330	trad_frame_set_reg_addr (cache, mips_regnum (gdbarch)->fp_control_status,
	331	addr);
	332	}
	333
	334	trad_frame_set_id (cache, frame_id_build (sp, func));
	335	}
	336
	337	#define MIPS_INST_ADDIU_A0_SP_O32 (0x27a40000 \
	338	+ O32_SIGFRAME_UCONTEXT_OFFSET)
	339
	340	static const struct tramp_frame mips_fbsd_sigframe =
	341	{
	342	SIGTRAMP_FRAME,
	343	MIPS_INSN32_SIZE,
	344	{
	345	{ MIPS_INST_ADDIU_A0_SP_O32, -1 }, /* addiu a0, sp, SIGF_UC */
	346	{ MIPS_INST_LI_V0_SIGRETURN, -1 }, /* li v0, SYS_sigreturn */
	347	{ MIPS_INST_SYSCALL, -1 }, /* syscall */
	348	{ MIPS_INST_BREAK, -1 }, /* break */
	349	{ TRAMP_SENTINEL_INSN, -1 }
	350	},
	351	mips_fbsd_sigframe_init
	352	};
	353
	354	#define N64_SIGFRAME_UCONTEXT_OFFSET (32)
	355	#define N64_SIGSET_T_SIZE (16)
	356
	357	#define N64_UCONTEXT_ONSTACK (N64_SIGSET_T_SIZE)
	358	#define N64_UCONTEXT_PC (N64_UCONTEXT_ONSTACK + 8)
	359	#define N64_UCONTEXT_REGS (N64_UCONTEXT_PC + 8)
	360	#define N64_UCONTEXT_SR (N64_UCONTEXT_REGS + 8 * 32)
	361	#define N64_UCONTEXT_LO (N64_UCONTEXT_SR + 8)
	362	#define N64_UCONTEXT_HI (N64_UCONTEXT_LO + 8)
	363	#define N64_UCONTEXT_FPUSED (N64_UCONTEXT_HI + 8)
	364	#define N64_UCONTEXT_FPREGS (N64_UCONTEXT_FPUSED + 8)
	365
	366	#define N64_UCONTEXT_REG_SIZE 8
	367
	368	static void
	369	mips64_fbsd_sigframe_init (const struct tramp_frame *self,
	370	struct frame_info *this_frame,
	371	struct trad_frame_cache *cache,
	372	CORE_ADDR func)
	373	{
	374	struct gdbarch *gdbarch = get_frame_arch (this_frame);
	375	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
	376	CORE_ADDR sp, ucontext_addr, addr;
	377	int regnum;
	378	gdb_byte buf[4];
	379
	380	/* We find the appropriate instance of `ucontext_t' at a
	381	fixed offset in the signal frame. */
	382	sp = get_frame_register_signed (this_frame,
	383	MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
	384	ucontext_addr = sp + N64_SIGFRAME_UCONTEXT_OFFSET;
	385
	386	/* PC. */
	387	regnum = mips_regnum (gdbarch)->pc;
388	trad_frame_set_reg_addr (cache,
389	regnum + gdbarch_num_regs (gdbarch),
390	ucontext_addr + N64_UCONTEXT_PC);
391
392	/* GPRs. */
393	for (regnum = MIPS_ZERO_REGNUM, addr = ucontext_addr + N64_UCONTEXT_REGS;
394	regnum <= MIPS_RA_REGNUM; regnum++, addr += N64_UCONTEXT_REG_SIZE)
395	trad_frame_set_reg_addr (cache,
396	regnum + gdbarch_num_regs (gdbarch),
397	addr);
398
399	regnum = MIPS_PS_REGNUM;
400	trad_frame_set_reg_addr (cache,
401	regnum + gdbarch_num_regs (gdbarch),
402	ucontext_addr + N64_UCONTEXT_SR);
403
404	/* HI and LO. */
405	regnum = mips_regnum (gdbarch)->lo;
406	trad_frame_set_reg_addr (cache,
407	regnum + gdbarch_num_regs (gdbarch),
408	ucontext_addr + N64_UCONTEXT_LO);
409	regnum = mips_regnum (gdbarch)->hi;
410	trad_frame_set_reg_addr (cache,
411	regnum + gdbarch_num_regs (gdbarch),
412	ucontext_addr + N64_UCONTEXT_HI);
413
1c33cd7f YQ	414	if (target_read_memory (ucontext_addr + N64_UCONTEXT_FPUSED, buf, 4) == 0
1c33cd7f YQ	415	&& extract_unsigned_integer (buf, 4, byte_order) != 0)
387360da JB	416	{
	417	for (regnum = 0, addr = ucontext_addr + N64_UCONTEXT_FPREGS;
	418	regnum < 32; regnum++, addr += N64_UCONTEXT_REG_SIZE)
	419	trad_frame_set_reg_addr (cache,
	420	regnum + gdbarch_fp0_regnum (gdbarch),
	421	addr);
	422	trad_frame_set_reg_addr (cache, mips_regnum (gdbarch)->fp_control_status,
	423	addr);
	424	}
	425
	426	trad_frame_set_id (cache, frame_id_build (sp, func));
	427	}
	428
a80a6471 JB	429	#define MIPS_INST_ADDIU_A0_SP_N32 (0x27a40000 \
	430	+ N64_SIGFRAME_UCONTEXT_OFFSET)
	431
	432	static const struct tramp_frame mipsn32_fbsd_sigframe =
	433	{
	434	SIGTRAMP_FRAME,
	435	MIPS_INSN32_SIZE,
	436	{
	437	{ MIPS_INST_ADDIU_A0_SP_N32, -1 }, /* addiu a0, sp, SIGF_UC */
	438	{ MIPS_INST_LI_V0_SIGRETURN, -1 }, /* li v0, SYS_sigreturn */
	439	{ MIPS_INST_SYSCALL, -1 }, /* syscall */
	440	{ MIPS_INST_BREAK, -1 }, /* break */
	441	{ TRAMP_SENTINEL_INSN, -1 }
	442	},
	443	mips64_fbsd_sigframe_init
	444	};
	445
387360da JB	446	#define MIPS_INST_DADDIU_A0_SP_N64 (0x67a40000 \
	447	+ N64_SIGFRAME_UCONTEXT_OFFSET)
	448
	449	static const struct tramp_frame mips64_fbsd_sigframe =
	450	{
	451	SIGTRAMP_FRAME,
	452	MIPS_INSN32_SIZE,
	453	{
	454	{ MIPS_INST_DADDIU_A0_SP_N64, -1 }, /* daddiu a0, sp, SIGF_UC */
	455	{ MIPS_INST_LI_V0_SIGRETURN, -1 }, /* li v0, SYS_sigreturn */
	456	{ MIPS_INST_SYSCALL, -1 }, /* syscall */
	457	{ MIPS_INST_BREAK, -1 }, /* break */
	458	{ TRAMP_SENTINEL_INSN, -1 }
	459	},
	460	mips64_fbsd_sigframe_init
	461	};
	462
	463	/* Shared library support. */
	464
	465	/* FreeBSD/mips uses a slightly different `struct link_map' than the
	466	other FreeBSD platforms as it includes an additional `l_off'
	467	member. */
	468
	469	static struct link_map_offsets *
	470	mips_fbsd_ilp32_fetch_link_map_offsets (void)
	471	{
	472	static struct link_map_offsets lmo;
	473	static struct link_map_offsets *lmp = NULL;
	474
	475	if (lmp == NULL)
	476	{
	477	lmp = &lmo;
	478
	479	lmo.r_version_offset = 0;
	480	lmo.r_version_size = 4;
	481	lmo.r_map_offset = 4;
	482	lmo.r_brk_offset = 8;
	483	lmo.r_ldsomap_offset = -1;
	484
	485	lmo.link_map_size = 24;
	486	lmo.l_addr_offset = 0;
	487	lmo.l_name_offset = 8;
	488	lmo.l_ld_offset = 12;
	489	lmo.l_next_offset = 16;
	490	lmo.l_prev_offset = 20;
	491	}
	492
	493	return lmp;
	494	}
	495
	496	static struct link_map_offsets *
	497	mips_fbsd_lp64_fetch_link_map_offsets (void)
	498	{
	499	static struct link_map_offsets lmo;
	500	static struct link_map_offsets *lmp = NULL;
	501
	502	if (lmp == NULL)
	503	{
	504	lmp = &lmo;
	505
	506	lmo.r_version_offset = 0;
	507	lmo.r_version_size = 4;
	508	lmo.r_map_offset = 8;
	509	lmo.r_brk_offset = 16;
510	lmo.r_ldsomap_offset = -1;
511
512	lmo.link_map_size = 48;
513	lmo.l_addr_offset = 0;
514	lmo.l_name_offset = 16;
515	lmo.l_ld_offset = 24;
516	lmo.l_next_offset = 32;
517	lmo.l_prev_offset = 40;
518	}
519
520	return lmp;
521	}
522
523	static void
524	mips_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
525	{
526	enum mips_abi abi = mips_abi (gdbarch);
527
528	/* Generic FreeBSD support. */
529	fbsd_init_abi (info, gdbarch);
530
531	set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
532
533	switch (abi)
534	{
535	case MIPS_ABI_O32:
536	tramp_frame_prepend_unwinder (gdbarch, &mips_fbsd_sigframe);
537	break;
538	case MIPS_ABI_N32:
a80a6471	539	tramp_frame_prepend_unwinder (gdbarch, &mipsn32_fbsd_sigframe);
387360da JB	540	break;
	541	case MIPS_ABI_N64:
	542	tramp_frame_prepend_unwinder (gdbarch, &mips64_fbsd_sigframe);
	543	break;
	544	}
	545
	546	set_gdbarch_iterate_over_regset_sections
	547	(gdbarch, mips_fbsd_iterate_over_regset_sections);
	548
	549	/* FreeBSD/mips has SVR4-style shared libraries. */
	550	set_solib_svr4_fetch_link_map_offsets
	551	(gdbarch, (gdbarch_ptr_bit (gdbarch) == 32 ?
	552	mips_fbsd_ilp32_fetch_link_map_offsets :
	553	mips_fbsd_lp64_fetch_link_map_offsets));
	554	}
387360da JB	555
	556	void
	557	_initialize_mips_fbsd_tdep (void)
	558	{
c988ac1d	559	gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_FREEBSD,
387360da JB	560	mips_fbsd_init_abi);
387360da JB	561	}