327 lines
8.5 KiB
C
327 lines
8.5 KiB
C
/* Low level interface to ptrace, for the remote server for GDB.
|
|
Copyright (C) 1995-2017 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
|
|
{
|
|
int regno_start;
|
|
int regno_end;
|
|
};
|
|
|
|
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 ®s_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);
|
|
}
|