| /* Native-dependent code for Motorola 68000 BSD's. |
| |
| Copyright (C) 2004-2021 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/>. */ |
| |
| /* We define this to get types like register_t. */ |
| #define _KERNTYPES |
| #include "defs.h" |
| #include "gdbcore.h" |
| #include "inferior.h" |
| #include "regcache.h" |
| |
| #include <sys/types.h> |
| #include <sys/ptrace.h> |
| #include <machine/reg.h> |
| |
| #include "m68k-tdep.h" |
| #include "inf-ptrace.h" |
| #include "netbsd-nat.h" |
| |
| struct m68k_bsd_nat_target final : public nbsd_nat_target |
| { |
| void fetch_registers (struct regcache *, int) override; |
| void store_registers (struct regcache *, int) override; |
| }; |
| |
| static m68k_bsd_nat_target the_m68k_bsd_nat_target; |
| |
| 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 gdb_byte *regs = (const gdb_byte *) gregs; |
| int regnum; |
| |
| for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++) |
| regcache->raw_supply (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 = regcache->arch (); |
| const gdb_byte *regs = (const gdb_byte *) fpregs; |
| int regnum; |
| |
| for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++) |
| regcache->raw_supply (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) |
| { |
| gdb_byte *regs = (gdb_byte *) gregs; |
| int i; |
| |
| for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) |
| { |
| if (regnum == -1 || regnum == i) |
| regcache->raw_collect (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 = regcache->arch (); |
| char *regs = fpregs; |
| int i; |
| |
| for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) |
| { |
| if (regnum == -1 || regnum == i) |
| regcache->raw_collect (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). */ |
| |
| void |
| m68k_bsd_nat_target::fetch_registers (struct regcache *regcache, int regnum) |
| { |
| pid_t pid = regcache->ptid ().pid (); |
| int lwp = regcache->ptid ().lwp (); |
| |
| if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) |
| { |
| struct reg regs; |
| |
| if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -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, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -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). */ |
| |
| void |
| m68k_bsd_nat_target::store_registers (struct regcache *regcache, int regnum) |
| { |
| pid_t pid = regcache->ptid ().pid (); |
| int lwp = regcache->ptid ().lwp (); |
| |
| if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) |
| { |
| struct reg regs; |
| |
| if (ptrace (PT_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) |
| perror_with_name (_("Couldn't get registers")); |
| |
| m68kbsd_collect_gregset (regcache, ®s, regnum); |
| |
| if (ptrace (PT_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, lwp) == -1) |
| perror_with_name (_("Couldn't write registers")); |
| } |
| |
| if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) |
| { |
| struct fpreg fpregs; |
| |
| if (ptrace (PT_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) |
| perror_with_name (_("Couldn't get floating point status")); |
| |
| m68kbsd_collect_fpregset (regcache, &fpregs, regnum); |
| |
| if (ptrace (PT_SETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, lwp) == -1) |
| perror_with_name (_("Couldn't write floating point status")); |
| } |
| } |
| |
| |
| /* Support for debugging kernel virtual memory images. */ |
| |
| #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 (regnum, &pcb->pcb_regs[i++]); |
| for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++) |
| regcache->raw_supply (regnum, &pcb->pcb_regs[i++]); |
| |
| tmp = pcb->pcb_ps & 0xffff; |
| regcache->raw_supply (M68K_PS_REGNUM, &tmp); |
| |
| read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (gdb_byte *) &tmp, sizeof tmp); |
| regcache->raw_supply (M68K_PC_REGNUM, &tmp); |
| |
| return 1; |
| } |
| |
| void _initialize_m68kbsd_nat (); |
| void |
| _initialize_m68kbsd_nat () |
| { |
| add_inf_child_target (&the_m68k_bsd_nat_target); |
| |
| /* Support debugging kernel virtual memory images. */ |
| bsd_kvm_add_target (m68kbsd_supply_pcb); |
| } |