1 /* Functions specific to running gdb native on an ns32k running NetBSD 2 Copyright 1989, 1992, 1993, 1994, 1996 Free Software Foundation, Inc. 3 4 This file is part of GDB. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ 19 20 #include <sys/types.h> 21 #include <sys/ptrace.h> 22 #include <machine/reg.h> 23 #include <machine/frame.h> 24 #include <machine/pcb.h> 25 26 #include "defs.h" 27 #include "inferior.h" 28 #include "target.h" 29 #include "gdbcore.h" 30 31 #define RF(dst, src) \ 32 memcpy(®isters[REGISTER_BYTE(dst)], &src, sizeof(src)) 33 34 #define RS(src, dst) \ 35 memcpy(&dst, ®isters[REGISTER_BYTE(src)], sizeof(dst)) 36 37 void 38 fetch_inferior_registers (regno) 39 int regno; 40 { 41 struct reg inferior_registers; 42 struct fpreg inferior_fpregisters; 43 44 ptrace (PT_GETREGS, inferior_pid, 45 (PTRACE_ARG3_TYPE) &inferior_registers, 0); 46 ptrace (PT_GETFPREGS, inferior_pid, 47 (PTRACE_ARG3_TYPE) &inferior_fpregisters, 0); 48 49 RF(R0_REGNUM + 0, inferior_registers.r_r0); 50 RF(R0_REGNUM + 1, inferior_registers.r_r1); 51 RF(R0_REGNUM + 2, inferior_registers.r_r2); 52 RF(R0_REGNUM + 3, inferior_registers.r_r3); 53 RF(R0_REGNUM + 4, inferior_registers.r_r4); 54 RF(R0_REGNUM + 5, inferior_registers.r_r5); 55 RF(R0_REGNUM + 6, inferior_registers.r_r6); 56 RF(R0_REGNUM + 7, inferior_registers.r_r7); 57 58 RF(SP_REGNUM , inferior_registers.r_sp); 59 RF(FP_REGNUM , inferior_registers.r_fp); 60 RF(PC_REGNUM , inferior_registers.r_pc); 61 RF(PS_REGNUM , inferior_registers.r_psr); 62 63 RF(FPS_REGNUM , inferior_fpregisters.r_fsr); 64 RF(FP0_REGNUM +0, inferior_fpregisters.r_freg[0]); 65 RF(FP0_REGNUM +2, inferior_fpregisters.r_freg[2]); 66 RF(FP0_REGNUM +4, inferior_fpregisters.r_freg[4]); 67 RF(FP0_REGNUM +6, inferior_fpregisters.r_freg[6]); 68 RF(LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]); 69 RF(LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]); 70 RF(LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]); 71 RF(LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]); 72 registers_fetched (); 73 } 74 75 void 76 store_inferior_registers (regno) 77 int regno; 78 { 79 struct reg inferior_registers; 80 struct fpreg inferior_fpregisters; 81 82 RS(R0_REGNUM + 0, inferior_registers.r_r0); 83 RS(R0_REGNUM + 1, inferior_registers.r_r1); 84 RS(R0_REGNUM + 2, inferior_registers.r_r2); 85 RS(R0_REGNUM + 3, inferior_registers.r_r3); 86 RS(R0_REGNUM + 4, inferior_registers.r_r4); 87 RS(R0_REGNUM + 5, inferior_registers.r_r5); 88 RS(R0_REGNUM + 6, inferior_registers.r_r6); 89 RS(R0_REGNUM + 7, inferior_registers.r_r7); 90 91 RS(SP_REGNUM , inferior_registers.r_sp); 92 RS(FP_REGNUM , inferior_registers.r_fp); 93 RS(PC_REGNUM , inferior_registers.r_pc); 94 RS(PS_REGNUM , inferior_registers.r_psr); 95 96 RS(FPS_REGNUM , inferior_fpregisters.r_fsr); 97 RS(FP0_REGNUM +0, inferior_fpregisters.r_freg[0]); 98 RS(FP0_REGNUM +2, inferior_fpregisters.r_freg[2]); 99 RS(FP0_REGNUM +4, inferior_fpregisters.r_freg[4]); 100 RS(FP0_REGNUM +6, inferior_fpregisters.r_freg[6]); 101 RS(LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]); 102 RS(LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]); 103 RS(LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]); 104 RS(LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]); 105 106 ptrace (PT_SETREGS, inferior_pid, 107 (PTRACE_ARG3_TYPE) &inferior_registers, 0); 108 ptrace (PT_SETFPREGS, inferior_pid, 109 (PTRACE_ARG3_TYPE) &inferior_fpregisters, 0); 110 } 111 112 113 /* XXX - Add this to machine/regs.h instead? */ 114 struct coreregs { 115 struct reg intreg; 116 struct fpreg freg; 117 }; 118 119 /* Get registers from a core file. */ 120 static void 121 fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) 122 char *core_reg_sect; 123 unsigned core_reg_size; 124 int which; 125 unsigned int reg_addr; /* Unused in this version */ 126 { 127 struct coreregs *core_reg; 128 129 core_reg = (struct coreregs *)core_reg_sect; 130 131 /* 132 * We have *all* registers 133 * in the first core section. 134 * Ignore which. 135 */ 136 137 if (core_reg_size < sizeof(*core_reg)) { 138 fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n"); 139 return; 140 } 141 142 /* Integer registers */ 143 RF(R0_REGNUM + 0, core_reg->intreg.r_r0); 144 RF(R0_REGNUM + 1, core_reg->intreg.r_r1); 145 RF(R0_REGNUM + 2, core_reg->intreg.r_r2); 146 RF(R0_REGNUM + 3, core_reg->intreg.r_r3); 147 RF(R0_REGNUM + 4, core_reg->intreg.r_r4); 148 RF(R0_REGNUM + 5, core_reg->intreg.r_r5); 149 RF(R0_REGNUM + 6, core_reg->intreg.r_r6); 150 RF(R0_REGNUM + 7, core_reg->intreg.r_r7); 151 152 RF(SP_REGNUM , core_reg->intreg.r_sp); 153 RF(FP_REGNUM , core_reg->intreg.r_fp); 154 RF(PC_REGNUM , core_reg->intreg.r_pc); 155 RF(PS_REGNUM , core_reg->intreg.r_psr); 156 157 /* Floating point registers */ 158 RF(FPS_REGNUM , core_reg->freg.r_fsr); 159 RF(FP0_REGNUM +0, core_reg->freg.r_freg[0]); 160 RF(FP0_REGNUM +2, core_reg->freg.r_freg[2]); 161 RF(FP0_REGNUM +4, core_reg->freg.r_freg[4]); 162 RF(FP0_REGNUM +6, core_reg->freg.r_freg[6]); 163 RF(LP0_REGNUM + 1, core_reg->freg.r_freg[1]); 164 RF(LP0_REGNUM + 3, core_reg->freg.r_freg[3]); 165 RF(LP0_REGNUM + 5, core_reg->freg.r_freg[5]); 166 RF(LP0_REGNUM + 7, core_reg->freg.r_freg[7]); 167 registers_fetched (); 168 } 169 170 /* Register that we are able to handle ns32knbsd core file formats. 171 FIXME: is this really bfd_target_unknown_flavour? */ 172 173 static struct core_fns nat_core_fns = 174 { 175 bfd_target_unknown_flavour, 176 fetch_core_registers, 177 NULL 178 }; 179 180 void 181 _initialize_ns32knbsd_nat () 182 { 183 add_core_fns (&nat_core_fns); 184 } 185 186 187 /* 188 * kernel_u_size() is not helpful on NetBSD because 189 * the "u" struct is NOT in the core dump file. 190 */ 191 192 #ifdef FETCH_KCORE_REGISTERS 193 /* 194 * Get registers from a kernel crash dump or live kernel. 195 * Called by kcore-nbsd.c:get_kcore_registers(). 196 */ 197 void 198 fetch_kcore_registers (pcb) 199 struct pcb *pcb; 200 { 201 struct switchframe sf; 202 struct reg intreg; 203 int dummy; 204 205 /* Integer registers */ 206 if (target_read_memory((CORE_ADDR)pcb->pcb_ksp, (char *)&sf, sizeof sf)) 207 error("Cannot read integer registers."); 208 209 /* We use the psr at kernel entry */ 210 if (target_read_memory((CORE_ADDR)pcb->pcb_onstack, (char *)&intreg, sizeof intreg)) 211 error("Cannot read processor status register."); 212 213 dummy = 0; 214 RF(R0_REGNUM + 0, dummy); 215 RF(R0_REGNUM + 1, dummy); 216 RF(R0_REGNUM + 2, dummy); 217 RF(R0_REGNUM + 3, sf.sf_r3); 218 RF(R0_REGNUM + 4, sf.sf_r4); 219 RF(R0_REGNUM + 5, sf.sf_r5); 220 RF(R0_REGNUM + 6, sf.sf_r6); 221 RF(R0_REGNUM + 7, sf.sf_r7); 222 223 dummy = pcb->pcb_kfp + 8; 224 RF(SP_REGNUM , dummy); 225 RF(FP_REGNUM , sf.sf_fp); 226 RF(PC_REGNUM , sf.sf_pc); 227 RF(PS_REGNUM , intreg.r_psr); 228 229 /* Floating point registers */ 230 RF(FPS_REGNUM , pcb->pcb_fsr); 231 RF(FP0_REGNUM +0, pcb->pcb_freg[0]); 232 RF(FP0_REGNUM +2, pcb->pcb_freg[2]); 233 RF(FP0_REGNUM +4, pcb->pcb_freg[4]); 234 RF(FP0_REGNUM +6, pcb->pcb_freg[6]); 235 RF(LP0_REGNUM + 1, pcb->pcb_freg[1]); 236 RF(LP0_REGNUM + 3, pcb->pcb_freg[3]); 237 RF(LP0_REGNUM + 5, pcb->pcb_freg[5]); 238 RF(LP0_REGNUM + 7, pcb->pcb_freg[7]); 239 registers_fetched (); 240 } 241 #endif /* FETCH_KCORE_REGISTERS */ 242 243 void 244 clear_regs() 245 { 246 double zero = 0.0; 247 int null = 0; 248 249 /* Integer registers */ 250 RF(R0_REGNUM + 0, null); 251 RF(R0_REGNUM + 1, null); 252 RF(R0_REGNUM + 2, null); 253 RF(R0_REGNUM + 3, null); 254 RF(R0_REGNUM + 4, null); 255 RF(R0_REGNUM + 5, null); 256 RF(R0_REGNUM + 6, null); 257 RF(R0_REGNUM + 7, null); 258 259 RF(SP_REGNUM , null); 260 RF(FP_REGNUM , null); 261 RF(PC_REGNUM , null); 262 RF(PS_REGNUM , null); 263 264 /* Floating point registers */ 265 RF(FPS_REGNUM , zero); 266 RF(FP0_REGNUM +0, zero); 267 RF(FP0_REGNUM +2, zero); 268 RF(FP0_REGNUM +4, zero); 269 RF(FP0_REGNUM +6, zero); 270 RF(LP0_REGNUM + 0, zero); 271 RF(LP0_REGNUM + 1, zero); 272 RF(LP0_REGNUM + 2, zero); 273 RF(LP0_REGNUM + 3, zero); 274 return; 275 } 276 277 /* Return number of args passed to a frame. 278 Can return -1, meaning no way to tell. */ 279 280 int 281 frame_num_args(fi) 282 struct frame_info *fi; 283 { 284 CORE_ADDR enter_addr; 285 CORE_ADDR argp; 286 int inst; 287 int args; 288 int i; 289 290 if (read_memory_integer (fi->frame, 4) == 0 && fi->pc < 0x10000) { 291 /* main is always called with three args */ 292 return(3); 293 } 294 enter_addr = ns32k_get_enter_addr(fi->pc); 295 if (enter_addr = 0) 296 return(-1); 297 argp = enter_addr == 1 ? SAVED_PC_AFTER_CALL(fi) : FRAME_SAVED_PC(fi); 298 for (i = 0; i < 16; i++) { 299 /* 300 * After a bsr gcc may emit the following instructions 301 * to remove the arguments from the stack: 302 * cmpqd 0,tos - to remove 4 bytes from the stack 303 * cmpd tos,tos - to remove 8 bytes from the stack 304 * adjsp[bwd] -n - to remove n bytes from the stack 305 * Gcc sometimes delays emitting these instructions and 306 * may even throw a branch between our feet. 307 */ 308 inst = read_memory_integer(argp , 4); 309 args = read_memory_integer(argp + 2, 4); 310 if ((inst & 0xff) == 0xea) { /* br */ 311 args = ((inst >> 8) & 0xffffff) | (args << 24); 312 if (args & 0x80) { 313 if (args & 0x40) { 314 args = ntohl(args); 315 } else { 316 args = ntohs(args & 0xffff); 317 if (args & 0x2000) 318 args |= 0xc000; 319 } 320 } else { 321 args = args & 0xff; 322 if (args & 0x40) 323 args |= 0x80; 324 } 325 argp += args; 326 continue; 327 } 328 if ((inst & 0xffff) == 0xb81f) /* cmpqd 0,tos */ 329 return(1); 330 else if ((inst & 0xffff) == 0xbdc7) /* cmpd tos,tos */ 331 return(2); 332 else if ((inst & 0xfffc) == 0xa57c) { /* adjsp[bwd] */ 333 switch (inst & 3) { 334 case 0: 335 args = ((args & 0xff) + 0x80); 336 break; 337 case 1: 338 args = ((ntohs(args) & 0xffff) + 0x8000); 339 break; 340 case 3: 341 args = -ntohl(args); 342 break; 343 default: 344 return(-1); 345 } 346 if (args / 4 > 10 || (args & 3) != 0) 347 continue; 348 return(args / 4); 349 } 350 argp += 1; 351 } 352 return(-1); 353 } 354