191 lines
4.7 KiB
C
191 lines
4.7 KiB
C
/* GNU/Linux/m68k specific low level interface, for the remote server for GDB.
|
|
Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
|
|
2007, 2008, 2009, 2010 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"
|
|
|
|
/* Defined in auto-generated file reg-m68k.c. */
|
|
void init_registers_m68k (void);
|
|
|
|
#ifdef HAVE_SYS_REG_H
|
|
#include <sys/reg.h>
|
|
#endif
|
|
|
|
#define m68k_num_regs 29
|
|
#define m68k_num_gregs 18
|
|
|
|
/* This table must line up with REGISTER_NAMES in tm-m68k.h */
|
|
static int m68k_regmap[] =
|
|
{
|
|
#ifdef PT_D0
|
|
PT_D0 * 4, PT_D1 * 4, PT_D2 * 4, PT_D3 * 4,
|
|
PT_D4 * 4, PT_D5 * 4, PT_D6 * 4, PT_D7 * 4,
|
|
PT_A0 * 4, PT_A1 * 4, PT_A2 * 4, PT_A3 * 4,
|
|
PT_A4 * 4, PT_A5 * 4, PT_A6 * 4, PT_USP * 4,
|
|
PT_SR * 4, PT_PC * 4,
|
|
#else
|
|
14 * 4, 0 * 4, 1 * 4, 2 * 4, 3 * 4, 4 * 4, 5 * 4, 6 * 4,
|
|
7 * 4, 8 * 4, 9 * 4, 10 * 4, 11 * 4, 12 * 4, 13 * 4, 15 * 4,
|
|
17 * 4, 18 * 4,
|
|
#endif
|
|
#ifdef PT_FP0
|
|
PT_FP0 * 4, PT_FP1 * 4, PT_FP2 * 4, PT_FP3 * 4,
|
|
PT_FP4 * 4, PT_FP5 * 4, PT_FP6 * 4, PT_FP7 * 4,
|
|
PT_FPCR * 4, PT_FPSR * 4, PT_FPIAR * 4
|
|
#else
|
|
21 * 4, 24 * 4, 27 * 4, 30 * 4, 33 * 4, 36 * 4,
|
|
39 * 4, 42 * 4, 45 * 4, 46 * 4, 47 * 4
|
|
#endif
|
|
};
|
|
|
|
static int
|
|
m68k_cannot_store_register (int regno)
|
|
{
|
|
return (regno >= m68k_num_regs);
|
|
}
|
|
|
|
static int
|
|
m68k_cannot_fetch_register (int regno)
|
|
{
|
|
return (regno >= m68k_num_regs);
|
|
}
|
|
|
|
#ifdef HAVE_PTRACE_GETREGS
|
|
#include <sys/procfs.h>
|
|
#include <sys/ptrace.h>
|
|
|
|
static void
|
|
m68k_fill_gregset (struct regcache *regcache, void *buf)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < m68k_num_gregs; i++)
|
|
collect_register (regcache, i, (char *) buf + m68k_regmap[i]);
|
|
}
|
|
|
|
static void
|
|
m68k_store_gregset (struct regcache *regcache, const void *buf)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < m68k_num_gregs; i++)
|
|
supply_register (regcache, i, (const char *) buf + m68k_regmap[i]);
|
|
}
|
|
|
|
static void
|
|
m68k_fill_fpregset (struct regcache *regcache, void *buf)
|
|
{
|
|
int i;
|
|
|
|
for (i = m68k_num_gregs; i < m68k_num_regs; i++)
|
|
collect_register (regcache, i, ((char *) buf
|
|
+ (m68k_regmap[i] - m68k_regmap[m68k_num_gregs])));
|
|
}
|
|
|
|
static void
|
|
m68k_store_fpregset (struct regcache *regcache, const void *buf)
|
|
{
|
|
int i;
|
|
|
|
for (i = m68k_num_gregs; i < m68k_num_regs; i++)
|
|
supply_register (regcache, i, ((const char *) buf
|
|
+ (m68k_regmap[i] - m68k_regmap[m68k_num_gregs])));
|
|
}
|
|
|
|
#endif /* HAVE_PTRACE_GETREGS */
|
|
|
|
struct regset_info target_regsets[] = {
|
|
#ifdef HAVE_PTRACE_GETREGS
|
|
{ PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
|
|
GENERAL_REGS,
|
|
m68k_fill_gregset, m68k_store_gregset },
|
|
{ PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (elf_fpregset_t),
|
|
FP_REGS,
|
|
m68k_fill_fpregset, m68k_store_fpregset },
|
|
#endif /* HAVE_PTRACE_GETREGS */
|
|
{ 0, 0, 0, -1, -1, NULL, NULL }
|
|
};
|
|
|
|
static const unsigned char m68k_breakpoint[] = { 0x4E, 0x4F };
|
|
#define m68k_breakpoint_len 2
|
|
|
|
static CORE_ADDR
|
|
m68k_get_pc (struct regcache *regcache)
|
|
{
|
|
unsigned long pc;
|
|
|
|
collect_register_by_name (regcache, "pc", &pc);
|
|
return pc;
|
|
}
|
|
|
|
static void
|
|
m68k_set_pc (struct regcache *regcache, CORE_ADDR value)
|
|
{
|
|
unsigned long newpc = value;
|
|
|
|
supply_register_by_name (regcache, "pc", &newpc);
|
|
}
|
|
|
|
static int
|
|
m68k_breakpoint_at (CORE_ADDR pc)
|
|
{
|
|
unsigned char c[2];
|
|
|
|
read_inferior_memory (pc, c, 2);
|
|
if (c[0] == 0x4E && c[1] == 0x4F)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#include <asm/ptrace.h>
|
|
|
|
#ifdef PTRACE_GET_THREAD_AREA
|
|
/* Fetch the thread-local storage pointer for libthread_db. */
|
|
|
|
ps_err_e
|
|
ps_get_thread_area (const struct ps_prochandle *ph,
|
|
lwpid_t lwpid, int idx, void **base)
|
|
{
|
|
if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
|
|
return PS_ERR;
|
|
|
|
/* IDX is the bias from the thread pointer to the beginning of the
|
|
thread descriptor. It has to be subtracted due to implementation
|
|
quirks in libthread_db. */
|
|
*base = (void *) ((char *)*base - idx);
|
|
|
|
return PS_OK;
|
|
}
|
|
#endif /* PTRACE_GET_THREAD_AREA */
|
|
|
|
struct linux_target_ops the_low_target = {
|
|
init_registers_m68k,
|
|
m68k_num_regs,
|
|
m68k_regmap,
|
|
m68k_cannot_fetch_register,
|
|
m68k_cannot_store_register,
|
|
m68k_get_pc,
|
|
m68k_set_pc,
|
|
m68k_breakpoint,
|
|
m68k_breakpoint_len,
|
|
NULL,
|
|
2,
|
|
m68k_breakpoint_at,
|
|
};
|