229 lines
6.1 KiB
C
229 lines
6.1 KiB
C
/* Motorola m68k native support for Linux
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Copyright 1996, 1998, 2000, 2001 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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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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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#ifdef USG
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#include <sys/types.h>
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#endif
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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/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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#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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/* This table must line up with REGISTER_NAMES in tm-m68k.h */
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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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/* BLOCKEND is the value of u.u_ar0, and points to the place where GS
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is stored. */
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int
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m68k_linux_register_u_addr (int blockend, int regnum)
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{
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return (blockend + 4 * regmap[regnum]);
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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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/* Note both m68k-tdep.c and m68klinux-nat.c contain definitions
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for supply_gregset and supply_fpregset. The definitions
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in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise,
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the definitions in m68klinux-nat.c will be used. This is a
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bit of a hack. The supply_* routines do not belong in
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*_tdep.c files. But, there are several lynx ports that currently
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depend on these definitions. */
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#ifndef USE_PROC_FS
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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void
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supply_gregset (elf_gregset_t *gregsetp)
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{
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int regi;
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for (regi = D0_REGNUM; regi <= SP_REGNUM; regi++)
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supply_register (regi, (char *) (*gregsetp + regmap[regi]));
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supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR));
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supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC));
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}
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/* Given a pointer to a floating point register set in /proc format
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(fpregset_t *), unpack the register contents and supply them as gdb's
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idea of the current floating point register values. */
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void
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supply_fpregset (elf_fpregset_t *fpregsetp)
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{
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int regi;
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for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++)
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supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]);
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supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]);
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supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]);
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supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]);
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}
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#endif
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/* Interpreting register set info found in core files. */
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/* Provide registers to GDB from a core file.
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(We can't use the generic version of this function in
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core-regset.c, because we need to use elf_gregset_t instead of
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gregset_t.)
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CORE_REG_SECT points to an array of bytes, which are the contents
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of a `note' from a core file which BFD thinks might contain
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register contents. CORE_REG_SIZE is its size.
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WHICH says which register set corelow suspects this is:
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0 --- the general-purpose register set, in elf_gregset_t format
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2 --- the floating-point register set, in elf_fpregset_t format
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REG_ADDR isn't used on Linux. */
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static void
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fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
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int which, CORE_ADDR reg_addr)
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{
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elf_gregset_t gregset;
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elf_fpregset_t fpregset;
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switch (which)
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{
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case 0:
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if (core_reg_size != sizeof (gregset))
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warning ("Wrong size gregset in core file.");
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else
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{
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memcpy (&gregset, core_reg_sect, sizeof (gregset));
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supply_gregset (&gregset);
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}
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break;
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case 2:
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if (core_reg_size != sizeof (fpregset))
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warning ("Wrong size fpregset in core file.");
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else
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{
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memcpy (&fpregset, core_reg_sect, sizeof (fpregset));
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supply_fpregset (&fpregset);
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}
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break;
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default:
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/* We've covered all the kinds of registers we know about here,
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so this must be something we wouldn't know what to do with
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anyway. Just ignore it. */
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break;
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}
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}
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int
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kernel_u_size (void)
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{
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return (sizeof (struct user));
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}
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/* Return non-zero if PC points into the signal trampoline. */
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int
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in_sigtramp (CORE_ADDR pc)
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{
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CORE_ADDR sp;
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char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT];
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int insn;
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sp = read_register (SP_REGNUM);
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if (pc - 2 < sp)
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return 0;
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if (read_memory_nobpt (pc, buf, sizeof (buf)))
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return 0;
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insn = extract_unsigned_integer (buf, sizeof (buf));
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if (insn == 0xdefc /* addaw #,sp */
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|| insn == 0x7077 /* moveq #119,d0 */
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|| insn == 0x4e40 /* trap #0 */
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|| insn == 0x203c /* movel #,d0 */ )
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return 1;
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if (read_memory_nobpt (pc - 2, buf, sizeof (buf)))
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return 0;
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insn = extract_unsigned_integer (buf, sizeof (buf));
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if (insn == 0xdefc /* addaw #,sp */
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|| insn == 0x7077 /* moveq #119,d0 */
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|| insn == 0x4e40 /* trap #0 */
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|| insn == 0x203c /* movel #,d0 */ )
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return 1;
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return 0;
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}
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/* Register that we are able to handle Linux ELF core file formats. */
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static struct core_fns linux_elf_core_fns =
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{
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bfd_target_elf_flavour, /* core_flavour */
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default_check_format, /* check_format */
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default_core_sniffer, /* core_sniffer */
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fetch_core_registers, /* core_read_registers */
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NULL /* next */
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};
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void
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_initialize_m68k_linux_nat ()
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{
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add_core_fns (&linux_elf_core_fns);
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}
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