1 /* Native-dependent code for Motorola 68000 BSD's. 2 3 Copyright 2004 Free Software Foundation, Inc. 4 5 This file is part of GDB. 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. */ 21 22 #include "defs.h" 23 #include "gdbcore.h" 24 #include "inferior.h" 25 #include "regcache.h" 26 27 #include "gdb_assert.h" 28 #include <sys/types.h> 29 #include <sys/ptrace.h> 30 #include <machine/reg.h> 31 32 #include "m68k-tdep.h" 33 #include "inf-ptrace.h" 34 35 static int 36 m68kbsd_gregset_supplies_p (int regnum) 37 { 38 return (regnum >= M68K_D0_REGNUM && regnum <= M68K_PC_REGNUM); 39 } 40 41 static int 42 m68kbsd_fpregset_supplies_p (int regnum) 43 { 44 return (regnum >= M68K_FP0_REGNUM && regnum <= M68K_FPI_REGNUM); 45 } 46 47 /* Supply the general-purpose registers stored in GREGS to REGCACHE. */ 48 49 static void 50 m68kbsd_supply_gregset (struct regcache *regcache, const void *gregs) 51 { 52 const char *regs = gregs; 53 int regnum; 54 55 for (regnum = M68K_D0_REGNUM; regnum <= M68K_PC_REGNUM; regnum++) 56 regcache_raw_supply (regcache, regnum, regs + regnum * 4); 57 } 58 59 /* Supply the floating-point registers stored in FPREGS to REGCACHE. */ 60 61 static void 62 m68kbsd_supply_fpregset (struct regcache *regcache, const void *fpregs) 63 { 64 const char *regs = fpregs; 65 int regnum; 66 67 for (regnum = M68K_FP0_REGNUM; regnum <= M68K_FPI_REGNUM; regnum++) 68 regcache_raw_supply (regcache, regnum, 69 regs + m68kbsd_fpreg_offset (regnum)); 70 } 71 72 /* Collect the general-purpose registers from REGCACHE and store them 73 in GREGS. */ 74 75 static void 76 m68kbsd_collect_gregset (const struct regcache *regcache, 77 void *gregs, int regnum) 78 { 79 char *regs = gregs; 80 int i; 81 82 for (i = M68K_D0_REGNUM; i <= M68K_PC_REGNUM; i++) 83 { 84 if (regnum == -1 || regnum == i) 85 regcache_raw_collect (regcache, i, regs + i * 4); 86 } 87 } 88 89 /* Collect the floating-point registers from REGCACHE and store them 90 in FPREGS. */ 91 92 static void 93 m68kbsd_collect_fpregset (struct regcache *regcache, 94 void *fpregs, int regnum) 95 { 96 char *regs = fpregs; 97 int i; 98 99 for (i = M68K_FP0_REGNUM; i <= M68K_FPI_REGNUM; i++) 100 { 101 if (regnum == -1 || regnum == i) 102 regcache_raw_collect (regcache, i, regs + m68kbsd_fpreg_offset (i)); 103 } 104 } 105 106 107 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this 108 for all registers (including the floating-point registers). */ 109 110 static void 111 m68kbsd_fetch_inferior_registers (int regnum) 112 { 113 if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) 114 { 115 struct reg regs; 116 117 if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), 118 (PTRACE_TYPE_ARG3) ®s, 0) == -1) 119 perror_with_name (_("Couldn't get registers")); 120 121 m68kbsd_supply_gregset (current_regcache, ®s); 122 } 123 124 if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) 125 { 126 struct fpreg fpregs; 127 128 if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), 129 (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) 130 perror_with_name (_("Couldn't get floating point status")); 131 132 m68kbsd_supply_fpregset (current_regcache, &fpregs); 133 } 134 } 135 136 /* Store register REGNUM back into the inferior. If REGNUM is -1, do 137 this for all registers (including the floating-point registers). */ 138 139 static void 140 m68kbsd_store_inferior_registers (int regnum) 141 { 142 if (regnum == -1 || m68kbsd_gregset_supplies_p (regnum)) 143 { 144 struct reg regs; 145 146 if (ptrace (PT_GETREGS, PIDGET (inferior_ptid), 147 (PTRACE_TYPE_ARG3) ®s, 0) == -1) 148 perror_with_name (_("Couldn't get registers")); 149 150 m68kbsd_collect_gregset (current_regcache, ®s, regnum); 151 152 if (ptrace (PT_SETREGS, PIDGET (inferior_ptid), 153 (PTRACE_TYPE_ARG3) ®s, 0) == -1) 154 perror_with_name (_("Couldn't write registers")); 155 } 156 157 if (regnum == -1 || m68kbsd_fpregset_supplies_p (regnum)) 158 { 159 struct fpreg fpregs; 160 161 if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid), 162 (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) 163 perror_with_name (_("Couldn't get floating point status")); 164 165 m68kbsd_collect_fpregset (current_regcache, &fpregs, regnum); 166 167 if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid), 168 (PTRACE_TYPE_ARG3) &fpregs, 0) == -1) 169 perror_with_name (_("Couldn't write floating point status")); 170 } 171 } 172 173 174 /* Support for debugging kernel virtual memory images. */ 175 176 #include <sys/types.h> 177 #include <machine/pcb.h> 178 179 #include "bsd-kvm.h" 180 181 /* OpenBSD doesn't have these. */ 182 #ifndef PCB_REGS_FP 183 #define PCB_REGS_FP 10 184 #endif 185 #ifndef PCB_REGS_SP 186 #define PCB_REGS_SP 11 187 #endif 188 189 static int 190 m68kbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb) 191 { 192 int regnum, tmp; 193 int i = 0; 194 195 /* The following is true for NetBSD 1.6.2: 196 197 The pcb contains %d2...%d7, %a2...%a7 and %ps. This accounts for 198 all callee-saved registers. From this information we reconstruct 199 the register state as it would look when we just returned from 200 cpu_switch(). */ 201 202 /* The stack pointer shouldn't be zero. */ 203 if (pcb->pcb_regs[PCB_REGS_SP] == 0) 204 return 0; 205 206 for (regnum = M68K_D2_REGNUM; regnum <= M68K_D7_REGNUM; regnum++) 207 regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]); 208 for (regnum = M68K_A2_REGNUM; regnum <= M68K_SP_REGNUM; regnum++) 209 regcache_raw_supply (regcache, regnum, &pcb->pcb_regs[i++]); 210 211 tmp = pcb->pcb_ps & 0xffff; 212 regcache_raw_supply (regcache, M68K_PS_REGNUM, &tmp); 213 214 read_memory (pcb->pcb_regs[PCB_REGS_FP] + 4, (char *) &tmp, sizeof tmp); 215 regcache_raw_supply (regcache, M68K_PC_REGNUM, &tmp); 216 217 return 1; 218 } 219 220 221 /* Provide a prototype to silence -Wmissing-prototypes. */ 222 void _initialize_m68kbsd_nat (void); 223 224 void 225 _initialize_m68kbsd_nat (void) 226 { 227 struct target_ops *t; 228 229 t = inf_ptrace_target (); 230 t->to_fetch_registers = m68kbsd_fetch_inferior_registers; 231 t->to_store_registers = m68kbsd_store_inferior_registers; 232 add_target (t); 233 234 /* Support debugging kernel virtual memory images. */ 235 bsd_kvm_add_target (m68kbsd_supply_pcb); 236 } 237