f36bf22c92
* m68k-tdep.c (m68k_frame_cache): Expect this_frame. (m68k_frame_this_id, m68k_frame_prev_register): Update signature. (m68k_frame_unwind): Use default_frame_sniffer. (m68k_frame_sniffer): Remove. (m68k_frame_base_address): Expect this_frame. (m68k_dummy_id): Renamed from m68k_unwind_dummy_id. Expect this_frame. (m68k_gdbarch_init): Use set_gdbarch_dummy_id, dwarf2_append_unwinders, and frame_unwind_append_unwinder. * m68klinux-tdep.c (m68k_linux_pc_in_sigtramp): Expect frame_info parameter instead of pc value. (m68k_linux_get_sigtramp_info, m68k_linux_sigtramp_frame_cache): Expect this_frame. (m68k_linux_sigtramp_frame_this_id) (m68k_linux_sigtramp_frame_prev_register) (m68k_linux_sigtramp_frame_sniffer): Update signature. (m68k_linux_sigtramp_frame_unwind): Use m68k_linux_sigtramp_frame_sniffer. (m68k_linux_init_abi): Use frame_unwind_append_unwinder. * m68klinux-nat.c (store_register): Fix typo.
613 lines
16 KiB
C
613 lines
16 KiB
C
/* Motorola m68k native support for GNU/Linux.
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Copyright (C) 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
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2008 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 "gdb_string.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 "m68k-tdep.h"
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/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 "gdb_stat.h"
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#include "floatformat.h"
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#include "target.h"
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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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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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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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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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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/* FIXME: This duplicates code from `inptrace.c'. The problem is that we
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define FETCH_INFERIOR_REGISTERS since we want to use our own versions
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of {fetch,store}_inferior_registers that use the GETREGS request. This
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means that the code in `infptrace.c' is #ifdef'd out. But we need to
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fall back on that code when GDB is running on top of a kernel that
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doesn't support the GETREGS request. */
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#ifndef PT_READ_U
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#define PT_READ_U PTRACE_PEEKUSR
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#endif
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#ifndef PT_WRITE_U
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#define PT_WRITE_U PTRACE_POKEUSR
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#endif
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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 = get_regcache_arch (regcache);
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/* This isn't really an address. But ptrace thinks of it as one. */
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CORE_ADDR regaddr;
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char mess[128]; /* For messages */
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int i;
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char buf[MAX_REGISTER_SIZE];
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int tid;
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if (gdbarch_cannot_fetch_register (gdbarch, regno))
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{
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memset (buf, '\0', register_size (gdbarch, regno)); /* Supply zeroes */
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regcache_raw_supply (regcache, regno, buf);
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return;
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}
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/* Overload thread id onto process id */
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tid = TIDGET (inferior_ptid);
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if (tid == 0)
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tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
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regaddr = 4 * regmap[regno];
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for (i = 0; i < register_size (gdbarch, regno);
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i += sizeof (PTRACE_TYPE_RET))
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{
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errno = 0;
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*(PTRACE_TYPE_RET *) &buf[i] = ptrace (PT_READ_U, tid,
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(PTRACE_TYPE_ARG3) regaddr, 0);
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regaddr += sizeof (PTRACE_TYPE_RET);
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if (errno != 0)
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{
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sprintf (mess, "reading register %s (#%d)",
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gdbarch_register_name (gdbarch, regno), regno);
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perror_with_name (mess);
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}
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}
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regcache_raw_supply (regcache, 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 (get_regcache_arch (regcache));
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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 = get_regcache_arch (regcache);
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/* This isn't really an address. But ptrace thinks of it as one. */
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CORE_ADDR regaddr;
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char mess[128]; /* For messages */
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int i;
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int tid;
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char buf[MAX_REGISTER_SIZE];
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if (gdbarch_cannot_store_register (gdbarch, regno))
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return;
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/* Overload thread id onto process id */
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tid = TIDGET (inferior_ptid);
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if (tid == 0)
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tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
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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 (regcache, 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);
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i += sizeof (PTRACE_TYPE_RET))
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{
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errno = 0;
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ptrace (PT_WRITE_U, tid, (PTRACE_TYPE_ARG3) regaddr,
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*(PTRACE_TYPE_RET *) (buf + i));
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regaddr += sizeof (PTRACE_TYPE_RET);
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if (errno != 0)
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{
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sprintf (mess, "writing register %s (#%d)",
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gdbarch_register_name (gdbarch, regno), regno);
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perror_with_name (mess);
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}
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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 (get_regcache_arch (regcache));
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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 = get_regcache_arch (regcache);
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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 (regcache, regi, ®p[regmap[regi]]);
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regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch),
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®p[PT_SR]);
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regcache_raw_supply (regcache,
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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 (regcache, 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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static void store_regs (const struct regcache *regcache, int tid, int regno) {}
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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 = get_regcache_arch (regcache);
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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 (regcache, regi,
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FPREG_ADDR (fpregsetp,
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regi - gdbarch_fp0_regnum (gdbarch)));
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regcache_raw_supply (regcache, M68K_FPC_REGNUM, &fpregsetp->fpcntl[0]);
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regcache_raw_supply (regcache, M68K_FPS_REGNUM, &fpregsetp->fpcntl[1]);
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regcache_raw_supply (regcache, 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 = get_regcache_arch (regcache);
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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 (regcache, i,
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FPREG_ADDR (fpregsetp,
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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 (regcache, i,
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&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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static void store_fpregs (const struct regcache *regcache, int tid, int regno) {}
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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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static void
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m68k_linux_fetch_inferior_registers (struct regcache *regcache, int regno)
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{
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int 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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/* GNU/Linux LWP ID's are process ID's. */
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tid = TIDGET (inferior_ptid);
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if (tid == 0)
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tid = PIDGET (inferior_ptid); /* Not a threaded program. */
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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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static void
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m68k_linux_store_inferior_registers (struct regcache *regcache, int regno)
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{
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int 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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{
|
||
old_store_inferior_registers (regcache, regno);
|
||
return;
|
||
}
|
||
|
||
/* GNU/Linux LWP ID's are process ID's. */
|
||
tid = TIDGET (inferior_ptid);
|
||
if (tid == 0)
|
||
tid = PIDGET (inferior_ptid); /* Not a threaded program. */
|
||
|
||
/* Use the PTRACE_SETFPREGS requests whenever possible, since it
|
||
transfers more registers in one system call. But remember that
|
||
store_fpregs can fail, and return zero. */
|
||
if (regno == -1)
|
||
{
|
||
store_regs (regcache, tid, regno);
|
||
store_fpregs (regcache, tid, regno);
|
||
return;
|
||
}
|
||
|
||
if (getregs_supplies (regno))
|
||
{
|
||
store_regs (regcache, tid, regno);
|
||
return;
|
||
}
|
||
|
||
if (getfpregs_supplies (regno))
|
||
{
|
||
store_fpregs (regcache, tid, regno);
|
||
return;
|
||
}
|
||
|
||
internal_error (__FILE__, __LINE__,
|
||
_("Got request to store bad register number %d."), regno);
|
||
}
|
||
|
||
/* Interpreting register set info found in core files. */
|
||
|
||
/* Provide registers to GDB from a core file.
|
||
|
||
(We can't use the generic version of this function in
|
||
core-regset.c, because we need to use elf_gregset_t instead of
|
||
gregset_t.)
|
||
|
||
CORE_REG_SECT points to an array of bytes, which are the contents
|
||
of a `note' from a core file which BFD thinks might contain
|
||
register contents. CORE_REG_SIZE is its size.
|
||
|
||
WHICH says which register set corelow suspects this is:
|
||
0 --- the general-purpose register set, in elf_gregset_t format
|
||
2 --- the floating-point register set, in elf_fpregset_t format
|
||
|
||
REG_ADDR isn't used on GNU/Linux. */
|
||
|
||
static void
|
||
fetch_core_registers (struct regcache *regcache,
|
||
char *core_reg_sect, unsigned core_reg_size,
|
||
int which, CORE_ADDR reg_addr)
|
||
{
|
||
elf_gregset_t gregset;
|
||
elf_fpregset_t fpregset;
|
||
|
||
switch (which)
|
||
{
|
||
case 0:
|
||
if (core_reg_size != sizeof (gregset))
|
||
warning (_("Wrong size gregset in core file."));
|
||
else
|
||
{
|
||
memcpy (&gregset, core_reg_sect, sizeof (gregset));
|
||
supply_gregset (regcache, (const elf_gregset_t *) &gregset);
|
||
}
|
||
break;
|
||
|
||
case 2:
|
||
if (core_reg_size != sizeof (fpregset))
|
||
warning (_("Wrong size fpregset in core file."));
|
||
else
|
||
{
|
||
memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
|
||
supply_fpregset (regcache, (const elf_fpregset_t *) &fpregset);
|
||
}
|
||
break;
|
||
|
||
default:
|
||
/* We've covered all the kinds of registers we know about here,
|
||
so this must be something we wouldn't know what to do with
|
||
anyway. Just ignore it. */
|
||
break;
|
||
}
|
||
}
|
||
|
||
|
||
/* Register that we are able to handle GNU/Linux ELF core file
|
||
formats. */
|
||
|
||
static struct core_fns linux_elf_core_fns =
|
||
{
|
||
bfd_target_elf_flavour, /* core_flavour */
|
||
default_check_format, /* check_format */
|
||
default_core_sniffer, /* core_sniffer */
|
||
fetch_core_registers, /* core_read_registers */
|
||
NULL /* next */
|
||
};
|
||
|
||
void _initialize_m68k_linux_nat (void);
|
||
|
||
void
|
||
_initialize_m68k_linux_nat (void)
|
||
{
|
||
struct target_ops *t;
|
||
|
||
/* Fill in the generic GNU/Linux methods. */
|
||
t = linux_target ();
|
||
|
||
/* Add our register access methods. */
|
||
t->to_fetch_registers = m68k_linux_fetch_inferior_registers;
|
||
t->to_store_registers = m68k_linux_store_inferior_registers;
|
||
|
||
/* Register the target. */
|
||
linux_nat_add_target (t);
|
||
|
||
deprecated_add_core_fns (&linux_elf_core_fns);
|
||
}
|