/* Low level interface to ptrace, for the remote server for GDB.

Copyright (C) 1995-2016 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 "server.h"

#include "linux-low.h"

#include "nat/gdb_ptrace.h"

#include "gdb_proc_service.h"

/* The stack pointer is offset from the stack frame by a BIAS of 2047

(0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC

hosts, so undefine it first. */

#undef BIAS

#define BIAS 2047

#ifdef HAVE_SYS_REG_H

#include <sys/reg.h>

#endif

#define INSN_SIZE 4

#define SPARC_R_REGS_NUM 32

#define SPARC_F_REGS_NUM 48

#define SPARC_CONTROL_REGS_NUM 6

#define sparc_num_regs \

(SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM)

/* Each offset is multiplied by 8, because of the register size.

These offsets apply to the buffer sent/filled by ptrace.

Additionally, the array elements order corresponds to the .dat file, and the

gdb's registers enumeration order. */

static int sparc_regmap[] = {

/* These offsets correspond to GET/SETREGSET. */

-1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */

7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */

-1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */

-1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */

/* Floating point registers offsets correspond to GET/SETFPREGSET. */

0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */

8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */

16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */

24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */

/* F32 offset starts next to f31: 31*4+4 = 16 * 8. */

16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */

24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */

17 *8, /* pc */

18 *8, /* npc */

16 *8, /* state */

/* FSR offset also corresponds to GET/SETFPREGSET, ans is placed

next to f62. */

32 *8, /* fsr */

-1, /* fprs */

/* Y register is 32-bits length, but gdb takes care of that. */

19 *8, /* y */

};

struct regs_range_t

};

static const struct regs_range_t gregs_ranges[] = {

{ 0, 31 }, /* g0 .. i7 */

{ 80, 82 }, /* pc .. state */

{ 84, 85 } /* fprs .. y */

};

#define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))

static const struct regs_range_t fpregs_ranges[] = {

{ 32, 79 }, /* f0 .. f62 */

{ 83, 83 } /* fsr */

};

#define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))

/* Defined in auto-generated file reg-sparc64.c. */

void init_registers_sparc64 (void);

extern const struct target_desc *tdesc_sparc64;

static int

sparc_cannot_store_register (int regno)

{

return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);

}

static int

sparc_cannot_fetch_register (int regno)

{

return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);

}

static void

sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf)

{

int i;

CORE_ADDR addr = 0;

unsigned char tmp_reg_buf[8];

const int l0_regno = find_regno (regcache->tdesc, "l0");

const int i7_regno = l0_regno + 15;

/* These registers have to be stored in the stack. */

memcpy (&addr,

((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],

sizeof (addr));

addr += BIAS;

for (i = l0_regno; i <= i7_regno; i++)

{

collect_register (regcache, i, tmp_reg_buf);

(*the_target->write_memory) (addr, tmp_reg_buf, sizeof (tmp_reg_buf));

addr += sizeof (tmp_reg_buf);

}

}

static void

sparc_fill_gregset (struct regcache *regcache, void *buf)

{

int i;

int range;

for (range = 0; range < N_GREGS_RANGES; range++)

for (i = gregs_ranges[range].regno_start;

i <= gregs_ranges[range].regno_end; i++)

if (sparc_regmap[i] != -1)

collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);

sparc_fill_gregset_to_stack (regcache, buf);

}

static void

sparc_fill_fpregset (struct regcache *regcache, void *buf)

{

int i;

int range;

for (range = 0; range < N_FPREGS_RANGES; range++)

for (i = fpregs_ranges[range].regno_start;

i <= fpregs_ranges[range].regno_end; i++)

collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);

}

static void

sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf)

{

int i;

CORE_ADDR addr = 0;

unsigned char tmp_reg_buf[8];

const int l0_regno = find_regno (regcache->tdesc, "l0");

const int i7_regno = l0_regno + 15;

/* These registers have to be obtained from the stack. */

memcpy (&addr,

((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],

sizeof (addr));

addr += BIAS;

for (i = l0_regno; i <= i7_regno; i++)

{

(*the_target->read_memory) (addr, tmp_reg_buf, sizeof (tmp_reg_buf));

supply_register (regcache, i, tmp_reg_buf);

addr += sizeof (tmp_reg_buf);

}

}

static void

sparc_store_gregset (struct regcache *regcache, const void *buf)

{

int i;

char zerobuf[8];

int range;

memset (zerobuf, 0, sizeof (zerobuf));

for (range = 0; range < N_GREGS_RANGES; range++)

for (i = gregs_ranges[range].regno_start;

i <= gregs_ranges[range].regno_end; i++)

if (sparc_regmap[i] != -1)

supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);

else

supply_register (regcache, i, zerobuf);

sparc_store_gregset_from_stack (regcache, buf);

}

static void

sparc_store_fpregset (struct regcache *regcache, const void *buf)

{

int i;

int range;

for (range = 0; range < N_FPREGS_RANGES; range++)

for (i = fpregs_ranges[range].regno_start;

i <= fpregs_ranges[range].regno_end;

i++)

supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);

}

static const gdb_byte sparc_breakpoint[INSN_SIZE] = {

0x91, 0xd0, 0x20, 0x01

};

#define sparc_breakpoint_len INSN_SIZE

/* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */

static const unsigned char *

sparc_sw_breakpoint_from_kind (int kind, int *size)

{

*size = sparc_breakpoint_len;

return sparc_breakpoint;

}

static int

sparc_breakpoint_at (CORE_ADDR where)

{

unsigned char insn[INSN_SIZE];

(*the_target->read_memory) (where, (unsigned char *) insn, sizeof (insn));

if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0)

return 1;

/* If necessary, recognize more trap instructions here. GDB only

uses TRAP Always. */

return 0;

}

static void

sparc_arch_setup (void)

{

current_process ()->tdesc = tdesc_sparc64;

}

static struct regset_info sparc_regsets[] = {

{ PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),

GENERAL_REGS,

sparc_fill_gregset, sparc_store_gregset },

{ PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t),

FP_REGS,

sparc_fill_fpregset, sparc_store_fpregset },

NULL_REGSET

};

static struct regsets_info sparc_regsets_info =

{

sparc_regsets, /* regsets */

0, /* num_regsets */

NULL, /* disabled_regsets */

};

static struct usrregs_info sparc_usrregs_info =

{

sparc_num_regs,

/* No regmap needs to be provided since this impl. doesn't use

USRREGS. */

NULL

};

static struct regs_info regs_info =

{

NULL, /* regset_bitmap */

&sparc_usrregs_info,

&sparc_regsets_info

};

static const struct regs_info *

sparc_regs_info (void)

{

return &regs_info;

}

struct linux_target_ops the_low_target = {

sparc_arch_setup,

sparc_regs_info,

sparc_cannot_fetch_register,

sparc_cannot_store_register,

NULL, /* fetch_register */

linux_get_pc_64bit,

/* No sparc_set_pc is needed. */

NULL,

NULL, /* breakpoint_kind_from_pc */

sparc_sw_breakpoint_from_kind,

NULL, /* get_next_pcs */

0,

sparc_breakpoint_at,

NULL, /* supports_z_point_type */

NULL, NULL, NULL, NULL,

NULL, NULL

};

void

initialize_low_arch (void)

{

/* Initialize the Linux target descriptions. */

init_registers_sparc64 ();

initialize_regsets_info (&sparc_regsets_info);

}