/* Native-dependent code for Motorola 68000 BSD's. Copyright (C) 2004-2013 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "defs.h" #include "gdbcore.h" #include "inferior.h" #include "regcache.h" #include "gdb_assert.h" #include <sys/types.h> #include <sys/ptrace.h> #include <machine/reg.h> #include "m68k-tdep.h" #include "inf-ptrace.h" static int m68kbsd_gregset_supplies_p (int regnum) { return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM); } static int m68kbsd_fpregset_supplies_p (int regnum) { return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM); } /* Supply the general-purpose registers stored in GREGS to REGCACHE. */ static void m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs) { const char *regs = gregs; int regnum; for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++) regcache_raw_supply (regcache, regnum, regs + regnum * 4); } /* Supply the floating-point registers stored in FPREGS to REGCACHE. */ static void m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs) { struct gdbarch *gdbarch = get_regcache_arch (regcache); const char *regs = fpregs; int regnum; for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++) regcache_raw_supply (regcache, regnum, regs + m68kbsd_fpreg_offset (gdbarch, regnum)); } /* Collect the general-purpose registers from REGCACHE and store them in GREGS. */ static void m68kbsd_collect_gregset (const struct regcache *regcache, void *gregs, int regnum) { char *regs = gregs; int i; for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) { if (regnum == -1 || regnum == i) regcache_raw_collect (regcache, i, regs + i * 4); } } /* Collect the floating-point registers from REGCACHE and store them in FPREGS. */ static void m68kbsd_collect_fpregset (struct regcache *regcache, void *fpregs, int regnum) { struct gdbarch *gdbarch = get_regcache_arch (regcache); char *regs = fpregs; int i; for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) { if (regnum == -1 || regnum == i) regcache_raw_collect (regcache, i, regs + m68kbsd_fpreg_offset (gdbarch, i)); } } /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this for all registers (including the floating-point registers). */ static void m68kbsd_fetch_inferior_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) { struct reg regs; if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), (PTRACE_TYPE_ARG3) ®s, 0) == -1) perror_with_name (_("Couldn't get registers")); m68kbsd_supply_gregset (regcache, ®s); } if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) { struct fpreg fpregs; if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) perror_with_name (_("Couldn't get floating point status")); m68kbsd_supply_fpregset (regcache, &fpregs); } } /* Store register REGNUM back into the inferior. If REGNUM is -1, do this for all registers (including the floating-point registers). */ static void m68kbsd_store_inferior_registers (struct target_ops *ops, struct regcache *regcache, int regnum) { if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) { struct reg regs; if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), (PTRACE_TYPE_ARG3) ®s, 0) == -1) perror_with_name (_("Couldn't get registers")); m68kbsd_collect_gregset (regcache, ®s, regnum); if (ptrace (PT_SETREGS, PIDGET (inferior_ptid), (PTRACE_TYPE_ARG3) ®s, 0) == -1) perror_with_name (_("Couldn't write registers")); } if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) { struct fpreg fpregs; if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) perror_with_name (_("Couldn't get floating point status")); m68kbsd_collect_fpregset (regcache, &fpregs, regnum); if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid), (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) perror_with_name (_("Couldn't write floating point status")); } } /* Support for debugging kernel virtual memory images. */ #include <sys/types.h> #include <machine/pcb.h> #include "bsd-kvm.h" /* OpenBSD doesn't have these. */ #ifndef PCB_REGS_FP #define PCB_REGS_FP 10 #endif #ifndef PCB_REGS_SP #define PCB_REGS_SP 11 #endif static int m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) { int regnum, tmp; int i = 0; /* The following is true for NetBSD 1.6.2: The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for all callee-saved registers. From this information we reconstruct the register state as it would look when we just returned from cpu_switch(). */ /* The stack pointer shouldn't be zero. */ if (pcb->pcb_regs[PCB_REGS_SP] == 0) return 0; for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++) regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]); for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++) regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]); tmp = pcb->pcb_ps & 0xffff; regcache_raw_supply (regcache, M68K_PS_REGNUM, &tmp); read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (char *) &tmp, sizeof tmp); regcache_raw_supply (regcache, M68K_PC_REGNUM, &tmp); return 1; } /* Provide a prototype to silence -Wmissing-prototypes. */ void _initialize_m68kbsd_nat (void); void _initialize_m68kbsd_nat (void) { struct target_ops *t; t = inf_ptrace_target (); t->to_fetch_registers = m68kbsd_fetch_inferior_registers; t->to_store_registers = m68kbsd_store_inferior_registers; add_target (t); /* Support debugging kernel virtual memory images. */ bsd_kvm_add_target (m68kbsd_supply_pcb); }