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522 lines
13 KiB
C
522 lines
13 KiB
C
/* Motorola m68k native support for GNU/Linux.
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Copyright (C) 1996-2021 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "language.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "target.h"
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#include "linux-nat.h"
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#include "gdbarch.h"
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#include "m68k-tdep.h"
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#include <sys/dir.h>
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#include <signal.h>
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#include "nat/gdb_ptrace.h"
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#include <sys/user.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <sys/procfs.h>
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#include <sys/file.h>
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#include <sys/stat.h>
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#include "floatformat.h"
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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/* Defines ps_err_e, struct ps_prochandle. */
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#include "gdb_proc_service.h"
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#include "inf-ptrace.h"
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#ifndef PTRACE_GET_THREAD_AREA
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#define PTRACE_GET_THREAD_AREA 25
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#endif
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class m68k_linux_nat_target final : public linux_nat_target
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{
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public:
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/* Add our register access methods. */
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void fetch_registers (struct regcache *, int) override;
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void store_registers (struct regcache *, int) override;
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};
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static m68k_linux_nat_target the_m68k_linux_nat_target;
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/* This table must line up with gdbarch_register_name in "m68k-tdep.c". */
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static const int regmap[] =
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{
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PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
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PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
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PT_SR, PT_PC,
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/* PT_FP0, ..., PT_FP7 */
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21, 24, 27, 30, 33, 36, 39, 42,
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/* PT_FPCR, PT_FPSR, PT_FPIAR */
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45, 46, 47
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};
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/* Which ptrace request retrieves which registers?
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These apply to the corresponding SET requests as well. */
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#define NUM_GREGS (18)
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#define MAX_NUM_REGS (NUM_GREGS + 11)
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static int
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getregs_supplies (int regno)
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{
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return 0 <= regno && regno < NUM_GREGS;
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}
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static int
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getfpregs_supplies (int regno)
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{
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return M68K_FP0_REGNUM <= regno && regno <= M68K_FPI_REGNUM;
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}
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/* Does the current host support the GETREGS request? */
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static int have_ptrace_getregs =
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#ifdef HAVE_PTRACE_GETREGS
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1
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#else
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0
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#endif
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;
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/* Fetching registers directly from the U area, one at a time. */
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/* Fetch one register. */
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static void
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fetch_register (struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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long regaddr, val;
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int i;
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gdb_byte buf[M68K_MAX_REGISTER_SIZE];
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pid_t tid = get_ptrace_pid (regcache->ptid ());
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regaddr = 4 * regmap[regno];
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for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
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{
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errno = 0;
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val = ptrace (PTRACE_PEEKUSER, tid, regaddr, 0);
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memcpy (&buf[i], &val, sizeof (long));
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regaddr += sizeof (long);
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if (errno != 0)
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error (_("Couldn't read register %s (#%d): %s."),
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gdbarch_register_name (gdbarch, regno),
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regno, safe_strerror (errno));
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}
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regcache->raw_supply (regno, buf);
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}
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/* Fetch register values from the inferior.
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If REGNO is negative, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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static void
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old_fetch_inferior_registers (struct regcache *regcache, int regno)
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{
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if (regno >= 0)
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{
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fetch_register (regcache, regno);
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}
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else
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{
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for (regno = 0;
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regno < gdbarch_num_regs (regcache->arch ());
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regno++)
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{
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fetch_register (regcache, regno);
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}
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}
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}
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/* Store one register. */
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static void
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store_register (const struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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long regaddr, val;
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int i;
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gdb_byte buf[M68K_MAX_REGISTER_SIZE];
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pid_t tid = get_ptrace_pid (regcache->ptid ());
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regaddr = 4 * regmap[regno];
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/* Put the contents of regno into a local buffer. */
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regcache->raw_collect (regno, buf);
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/* Store the local buffer into the inferior a chunk at the time. */
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for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
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{
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errno = 0;
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memcpy (&val, &buf[i], sizeof (long));
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ptrace (PTRACE_POKEUSER, tid, regaddr, val);
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regaddr += sizeof (long);
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if (errno != 0)
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error (_("Couldn't write register %s (#%d): %s."),
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gdbarch_register_name (gdbarch, regno),
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regno, safe_strerror (errno));
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}
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}
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/* Store our register values back into the inferior.
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If REGNO is negative, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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static void
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old_store_inferior_registers (const struct regcache *regcache, int regno)
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{
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if (regno >= 0)
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{
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store_register (regcache, regno);
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}
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else
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{
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for (regno = 0;
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regno < gdbarch_num_regs (regcache->arch ());
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regno++)
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{
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store_register (regcache, regno);
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}
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}
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}
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/* Given a pointer to a general register set in /proc format
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(elf_gregset_t *), unpack the register contents and supply
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them as gdb's idea of the current register values. */
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void
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supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
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int regi;
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for (regi = M68K_D0_REGNUM;
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regi <= gdbarch_sp_regnum (gdbarch);
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regi++)
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regcache->raw_supply (regi, ®p[regmap[regi]]);
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regcache->raw_supply (gdbarch_ps_regnum (gdbarch), ®p[PT_SR]);
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regcache->raw_supply (gdbarch_pc_regnum (gdbarch), ®p[PT_PC]);
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}
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/* Fill register REGNO (if it is a general-purpose register) in
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*GREGSETPS with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_gregset (const struct regcache *regcache,
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elf_gregset_t *gregsetp, int regno)
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{
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elf_greg_t *regp = (elf_greg_t *) gregsetp;
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int i;
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for (i = 0; i < NUM_GREGS; i++)
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if (regno == -1 || regno == i)
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regcache->raw_collect (i, regp + regmap[i]);
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}
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#ifdef HAVE_PTRACE_GETREGS
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/* Fetch all general-purpose registers from process/thread TID and
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store their values in GDB's register array. */
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static void
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fetch_regs (struct regcache *regcache, int tid)
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{
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elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
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{
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if (errno == EIO)
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{
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/* The kernel we're running on doesn't support the GETREGS
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request. Reset `have_ptrace_getregs'. */
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have_ptrace_getregs = 0;
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return;
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}
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perror_with_name (_("Couldn't get registers"));
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}
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supply_gregset (regcache, (const elf_gregset_t *) ®s);
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}
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/* Store all valid general-purpose registers in GDB's register array
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into the process/thread specified by TID. */
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static void
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store_regs (const struct regcache *regcache, int tid, int regno)
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{
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elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
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perror_with_name (_("Couldn't get registers"));
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fill_gregset (regcache, ®s, regno);
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if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
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perror_with_name (_("Couldn't write registers"));
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}
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#else
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static void fetch_regs (struct regcache *regcache, int tid)
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{
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}
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static void store_regs (const struct regcache *regcache, int tid, int regno)
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{
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}
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#endif
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/* Transfering floating-point registers between GDB, inferiors and cores. */
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/* What is the address of fpN within the floating-point register set F? */
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#define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
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/* Fill GDB's register array with the floating-point register values in
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*FPREGSETP. */
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void
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supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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int regi;
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for (regi = gdbarch_fp0_regnum (gdbarch);
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regi < gdbarch_fp0_regnum (gdbarch) + 8; regi++)
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regcache->raw_supply
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(regi, FPREG_ADDR (fpregsetp, regi - gdbarch_fp0_regnum (gdbarch)));
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regcache->raw_supply (M68K_FPC_REGNUM, &fpregsetp->fpcntl[0]);
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regcache->raw_supply (M68K_FPS_REGNUM, &fpregsetp->fpcntl[1]);
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regcache->raw_supply (M68K_FPI_REGNUM, &fpregsetp->fpcntl[2]);
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}
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/* Fill register REGNO (if it is a floating-point register) in
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*FPREGSETP with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_fpregset (const struct regcache *regcache,
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elf_fpregset_t *fpregsetp, int regno)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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int i;
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/* Fill in the floating-point registers. */
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for (i = gdbarch_fp0_regnum (gdbarch);
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i < gdbarch_fp0_regnum (gdbarch) + 8; i++)
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if (regno == -1 || regno == i)
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regcache->raw_collect
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(i, FPREG_ADDR (fpregsetp, i - gdbarch_fp0_regnum (gdbarch)));
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/* Fill in the floating-point control registers. */
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for (i = M68K_FPC_REGNUM; i <= M68K_FPI_REGNUM; i++)
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if (regno == -1 || regno == i)
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regcache->raw_collect (i, &fpregsetp->fpcntl[i - M68K_FPC_REGNUM]);
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}
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#ifdef HAVE_PTRACE_GETREGS
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/* Fetch all floating-point registers from process/thread TID and store
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thier values in GDB's register array. */
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static void
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fetch_fpregs (struct regcache *regcache, int tid)
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{
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elf_fpregset_t fpregs;
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if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
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perror_with_name (_("Couldn't get floating point status"));
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supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs);
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}
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/* Store all valid floating-point registers in GDB's register array
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into the process/thread specified by TID. */
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static void
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store_fpregs (const struct regcache *regcache, int tid, int regno)
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{
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elf_fpregset_t fpregs;
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if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
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perror_with_name (_("Couldn't get floating point status"));
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fill_fpregset (regcache, &fpregs, regno);
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if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
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perror_with_name (_("Couldn't write floating point status"));
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}
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#else
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static void fetch_fpregs (struct regcache *regcache, int tid)
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{
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}
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static void store_fpregs (const struct regcache *regcache, int tid, int regno)
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{
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}
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#endif
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/* Transferring arbitrary registers between GDB and inferior. */
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/* Fetch register REGNO from the child process. If REGNO is -1, do
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this for all registers (including the floating point and SSE
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registers). */
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void
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m68k_linux_nat_target::fetch_registers (struct regcache *regcache, int regno)
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{
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pid_t tid;
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/* Use the old method of peeking around in `struct user' if the
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GETREGS request isn't available. */
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if (! have_ptrace_getregs)
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{
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old_fetch_inferior_registers (regcache, regno);
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return;
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}
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tid = get_ptrace_pid (regcache->ptid ());
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/* Use the PTRACE_GETFPXREGS request whenever possible, since it
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transfers more registers in one system call, and we'll cache the
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results. But remember that fetch_fpxregs can fail, and return
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zero. */
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if (regno == -1)
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{
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fetch_regs (regcache, tid);
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/* The call above might reset `have_ptrace_getregs'. */
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if (! have_ptrace_getregs)
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{
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old_fetch_inferior_registers (regcache, -1);
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return;
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}
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fetch_fpregs (regcache, tid);
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return;
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}
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if (getregs_supplies (regno))
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{
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fetch_regs (regcache, tid);
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return;
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}
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if (getfpregs_supplies (regno))
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{
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fetch_fpregs (regcache, tid);
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return;
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}
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internal_error (__FILE__, __LINE__,
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_("Got request for bad register number %d."), regno);
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}
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/* Store register REGNO back into the child process. If REGNO is -1,
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do this for all registers (including the floating point and SSE
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registers). */
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void
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m68k_linux_nat_target::store_registers (struct regcache *regcache, int regno)
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{
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pid_t tid;
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/* Use the old method of poking around in `struct user' if the
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SETREGS request isn't available. */
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if (! have_ptrace_getregs)
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{
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old_store_inferior_registers (regcache, regno);
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return;
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}
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tid = get_ptrace_pid (regcache->ptid ());
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/* Use the PTRACE_SETFPREGS requests whenever possible, since it
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transfers more registers in one system call. But remember that
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store_fpregs can fail, and return zero. */
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if (regno == -1)
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{
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store_regs (regcache, tid, regno);
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store_fpregs (regcache, tid, regno);
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return;
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}
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if (getregs_supplies (regno))
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{
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store_regs (regcache, tid, regno);
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return;
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}
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if (getfpregs_supplies (regno))
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{
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store_fpregs (regcache, tid, regno);
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return;
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}
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internal_error (__FILE__, __LINE__,
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_("Got request to store bad register number %d."), regno);
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}
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/* Fetch the thread-local storage pointer for libthread_db. */
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ps_err_e
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ps_get_thread_area (struct ps_prochandle *ph,
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lwpid_t lwpid, int idx, void **base)
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{
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if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) < 0)
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return PS_ERR;
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/* IDX is the bias from the thread pointer to the beginning of the
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thread descriptor. It has to be subtracted due to implementation
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quirks in libthread_db. */
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*base = (char *) *base - idx;
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return PS_OK;
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}
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void _initialize_m68k_linux_nat ();
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void
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_initialize_m68k_linux_nat ()
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{
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/* Register the target. */
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linux_target = &the_m68k_linux_nat_target;
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add_inf_child_target (&the_m68k_linux_nat_target);
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}
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