/* Motorola m68k native support for Linux Copyright 1996, 1998, 2000, 2001 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 2 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, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include "defs.h" #include "frame.h" #include "inferior.h" #include "language.h" #include "gdbcore.h" #include "regcache.h" #ifdef USG #include <sys/types.h> #endif #include <sys/param.h> #include <sys/dir.h> #include <signal.h> #include <sys/user.h> #include <sys/ioctl.h> #include <fcntl.h> #include <sys/procfs.h> #include <sys/file.h> #include "gdb_stat.h" #include "floatformat.h" #include "target.h" /* This table must line up with REGISTER_NAMES in tm-m68k.h */ static const int regmap[] = { PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7, PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP, PT_SR, PT_PC, /* PT_FP0, ..., PT_FP7 */ 21, 24, 27, 30, 33, 36, 39, 42, /* PT_FPCR, PT_FPSR, PT_FPIAR */ 45, 46, 47 }; /* BLOCKEND is the value of u.u_ar0, and points to the place where GS is stored. */ int m68k_linux_register_u_addr (int blockend, int regnum) { return (blockend + 4 * regmap[regnum]); } /* Given a pointer to a general register set in /proc format (elf_gregset_t *), unpack the register contents and supply them as gdb's idea of the current register values. */ /* Note both m68k-tdep.c and m68klinux-nat.c contain definitions for supply_gregset and supply_fpregset. The definitions in m68k-tdep.c are valid if USE_PROC_FS is defined. Otherwise, the definitions in m68klinux-nat.c will be used. This is a bit of a hack. The supply_* routines do not belong in *_tdep.c files. But, there are several lynx ports that currently depend on these definitions. */ #ifndef USE_PROC_FS /* Prototypes for supply_gregset etc. */ #include "gregset.h" void supply_gregset (elf_gregset_t *gregsetp) { int regi; for (regi = D0_REGNUM; regi <= SP_REGNUM; regi++) supply_register (regi, (char *) (*gregsetp + regmap[regi])); supply_register (PS_REGNUM, (char *) (*gregsetp + PT_SR)); supply_register (PC_REGNUM, (char *) (*gregsetp + PT_PC)); } /* Given a pointer to a floating point register set in /proc format (fpregset_t *), unpack the register contents and supply them as gdb's idea of the current floating point register values. */ void supply_fpregset (elf_fpregset_t *fpregsetp) { int regi; for (regi = FP0_REGNUM; regi < FPC_REGNUM; regi++) supply_register (regi, (char *) &fpregsetp->fpregs[(regi - FP0_REGNUM) * 3]); supply_register (FPC_REGNUM, (char *) &fpregsetp->fpcntl[0]); supply_register (FPS_REGNUM, (char *) &fpregsetp->fpcntl[1]); supply_register (FPI_REGNUM, (char *) &fpregsetp->fpcntl[2]); } #endif /* 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 Linux. */ static void fetch_core_registers (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 (&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 (&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; } } int kernel_u_size (void) { return (sizeof (struct user)); } /* Return non-zero if PC points into the signal trampoline. */ int in_sigtramp (CORE_ADDR pc) { CORE_ADDR sp; char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT]; int insn; sp = read_register (SP_REGNUM); if (pc - 2 < sp) return 0; if (read_memory_nobpt (pc, buf, sizeof (buf))) return 0; insn = extract_unsigned_integer (buf, sizeof (buf)); if (insn == 0xdefc /* addaw #,sp */ || insn == 0x7077 /* moveq #119,d0 */ || insn == 0x4e40 /* trap #0 */ || insn == 0x203c /* movel #,d0 */ ) return 1; if (read_memory_nobpt (pc - 2, buf, sizeof (buf))) return 0; insn = extract_unsigned_integer (buf, sizeof (buf)); if (insn == 0xdefc /* addaw #,sp */ || insn == 0x7077 /* moveq #119,d0 */ || insn == 0x4e40 /* trap #0 */ || insn == 0x203c /* movel #,d0 */ ) return 1; return 0; } /* Register that we are able to handle 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 () { add_core_fns (&linux_elf_core_fns); }