gdb/tic80-tdep.c

   1 /* OBSOLETE /* Target-dependent code for the TI TMS320C80 (MVP) for GDB, the GNU debugger. */
   2 /* OBSOLETE    Copyright 1996, 1997, 1999, 2000, 2001 Free Software Foundation, Inc. */
   3 /* OBSOLETE  */
   4 /* OBSOLETE    This file is part of GDB. */
   5 /* OBSOLETE  */
   6 /* OBSOLETE    This program is free software; you can redistribute it and/or modify */
   7 /* OBSOLETE    it under the terms of the GNU General Public License as published by */
   8 /* OBSOLETE    the Free Software Foundation; either version 2 of the License, or */
   9 /* OBSOLETE    (at your option) any later version. */
  10 /* OBSOLETE  */
  11 /* OBSOLETE    This program is distributed in the hope that it will be useful, */
  12 /* OBSOLETE    but WITHOUT ANY WARRANTY; without even the implied warranty of */
  13 /* OBSOLETE    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the */
  14 /* OBSOLETE    GNU General Public License for more details. */
  15 /* OBSOLETE  */
  16 /* OBSOLETE    You should have received a copy of the GNU General Public License */
  17 /* OBSOLETE    along with this program; if not, write to the Free Software */
  18 /* OBSOLETE    Foundation, Inc., 59 Temple Place - Suite 330, */
  19 /* OBSOLETE    Boston, MA 02111-1307, USA.  */ */
  20 /* OBSOLETE  */
  21 /* OBSOLETE #include "defs.h" */
  22 /* OBSOLETE #include "value.h" */
  23 /* OBSOLETE #include "frame.h" */
  24 /* OBSOLETE #include "inferior.h" */
  25 /* OBSOLETE #include "obstack.h" */
  26 /* OBSOLETE #include "target.h" */
  27 /* OBSOLETE #include "bfd.h" */
  28 /* OBSOLETE #include "gdb_string.h" */
  29 /* OBSOLETE #include "gdbcore.h" */
  30 /* OBSOLETE #include "symfile.h" */
  31 /* OBSOLETE #include "regcache.h" */
  32 /* OBSOLETE  */
  33 /* OBSOLETE /* Function: frame_find_saved_regs */
  34 /* OBSOLETE    Return the frame_saved_regs structure for the frame. */
  35 /* OBSOLETE    Doesn't really work for dummy frames, but it does pass back */
  36 /* OBSOLETE    an empty frame_saved_regs, so I guess that's better than total failure */ */
  37 /* OBSOLETE  */
  38 /* OBSOLETE void */
  39 /* OBSOLETE tic80_frame_find_saved_regs (struct frame_info *fi, */
  40 /* OBSOLETE                          struct frame_saved_regs *regaddr) */
  41 /* OBSOLETE { */
  42 /* OBSOLETE   memcpy (regaddr, &fi->fsr, sizeof (struct frame_saved_regs)); */
  43 /* OBSOLETE } */
  44 /* OBSOLETE  */
  45 /* OBSOLETE /* Function: skip_prologue */
  46 /* OBSOLETE    Find end of function prologue.  */ */
  47 /* OBSOLETE  */
  48 /* OBSOLETE CORE_ADDR */
  49 /* OBSOLETE tic80_skip_prologue (CORE_ADDR pc) */
  50 /* OBSOLETE { */
  51 /* OBSOLETE   CORE_ADDR func_addr, func_end; */
  52 /* OBSOLETE   struct symtab_and_line sal; */
  53 /* OBSOLETE  */
  54 /* OBSOLETE   /* See what the symbol table says */ */
  55 /* OBSOLETE  */
  56 /* OBSOLETE   if (find_pc_partial_function (pc, NULL, &func_addr, &func_end)) */
  57 /* OBSOLETE     { */
  58 /* OBSOLETE       sal = find_pc_line (func_addr, 0); */
  59 /* OBSOLETE  */
  60 /* OBSOLETE       if (sal.line != 0 && sal.end < func_end) */
  61 /* OBSOLETE     return sal.end; */
  62 /* OBSOLETE       else */
  63 /* OBSOLETE     /* Either there's no line info, or the line after the prologue is after */
  64 /* OBSOLETE        the end of the function.  In this case, there probably isn't a */
  65 /* OBSOLETE        prologue.  */ */
  66 /* OBSOLETE     return pc; */
  67 /* OBSOLETE     } */
  68 /* OBSOLETE  */
  69 /* OBSOLETE   /* We can't find the start of this function, so there's nothing we can do. */ */
  70 /* OBSOLETE   return pc; */
  71 /* OBSOLETE } */
  72 /* OBSOLETE  */
  73 /* OBSOLETE /* Function: tic80_scan_prologue */
  74 /* OBSOLETE    This function decodes the target function prologue to determine: */
  75 /* OBSOLETE    1) the size of the stack frame */
  76 /* OBSOLETE    2) which registers are saved on it */
  77 /* OBSOLETE    3) the offsets of saved regs */
  78 /* OBSOLETE    4) the frame size */
  79 /* OBSOLETE    This information is stored in the "extra" fields of the frame_info.  */ */
  80 /* OBSOLETE  */
  81 /* OBSOLETE static void */
  82 /* OBSOLETE tic80_scan_prologue (struct frame_info *fi) */
  83 /* OBSOLETE { */
  84 /* OBSOLETE   struct symtab_and_line sal; */
  85 /* OBSOLETE   CORE_ADDR prologue_start, prologue_end, current_pc; */
  86 /* OBSOLETE  */
  87 /* OBSOLETE   /* Assume there is no frame until proven otherwise.  */ */
  88 /* OBSOLETE   fi->framereg = SP_REGNUM; */
  89 /* OBSOLETE   fi->framesize = 0; */
  90 /* OBSOLETE   fi->frameoffset = 0; */
  91 /* OBSOLETE  */
  92 /* OBSOLETE   /* this code essentially duplicates skip_prologue,  */
  93 /* OBSOLETE      but we need the start address below.  */ */
  94 /* OBSOLETE  */
  95 /* OBSOLETE   if (find_pc_partial_function (fi->pc, NULL, &prologue_start, &prologue_end)) */
  96 /* OBSOLETE     { */
  97 /* OBSOLETE       sal = find_pc_line (prologue_start, 0); */
  98 /* OBSOLETE  */
  99 /* OBSOLETE       if (sal.line == 0)    /* no line info, use current PC */ */
 100 /* OBSOLETE     if (prologue_start != entry_point_address ()) */
 101 /* OBSOLETE       prologue_end = fi->pc; */
 102 /* OBSOLETE     else */
 103 /* OBSOLETE       return;               /* _start has no frame or prologue */ */
 104 /* OBSOLETE       else if (sal.end < prologue_end)      /* next line begins after fn end */ */
 105 /* OBSOLETE     prologue_end = sal.end; /* (probably means no prologue)  */ */
 106 /* OBSOLETE     } */
 107 /* OBSOLETE   else */
 108 /* OBSOLETE /* FIXME */ */
 109 /* OBSOLETE     prologue_end = prologue_start + 40;             /* We're in the boondocks: allow for */ */
 110 /* OBSOLETE   /* 16 pushes, an add, and "mv fp,sp" */ */
 111 /* OBSOLETE  */
 112 /* OBSOLETE   prologue_end = min (prologue_end, fi->pc); */
 113 /* OBSOLETE  */
 114 /* OBSOLETE   /* Now search the prologue looking for instructions that set up the */
 115 /* OBSOLETE      frame pointer, adjust the stack pointer, and save registers.  */ */
 116 /* OBSOLETE  */
 117 /* OBSOLETE   for (current_pc = prologue_start; current_pc < prologue_end; current_pc += 4) */
 118 /* OBSOLETE     { */
 119 /* OBSOLETE       unsigned int insn; */
 120 /* OBSOLETE       int regno; */
 121 /* OBSOLETE       int offset = 0; */
 122 /* OBSOLETE  */
 123 /* OBSOLETE       insn = read_memory_unsigned_integer (current_pc, 4); */
 124 /* OBSOLETE  */
 125 /* OBSOLETE       if ((insn & 0x301000) == 0x301000)    /* Long immediate? */ */
 126 /* OBSOLETE /* FIXME - set offset for long immediate instructions */ */
 127 /* OBSOLETE     current_pc += 4; */
 128 /* OBSOLETE       else */
 129 /* OBSOLETE     { */
 130 /* OBSOLETE       offset = insn & 0x7fff;       /* extract 15-bit offset */ */
 131 /* OBSOLETE       if (offset & 0x4000)  /* if negative, sign-extend */ */
 132 /* OBSOLETE         offset = -(0x8000 - offset); */
 133 /* OBSOLETE     } */
 134 /* OBSOLETE  */
 135 /* OBSOLETE       if ((insn & 0x7fd0000) == 0x590000)   /* st.{w,d} reg, xx(r1) */ */
 136 /* OBSOLETE     { */
 137 /* OBSOLETE       regno = ((insn >> 27) & 0x1f); */
 138 /* OBSOLETE       fi->fsr.regs[regno] = offset; */
 139 /* OBSOLETE       if (insn & 0x8000)    /* 64-bit store (st.d)? */ */
 140 /* OBSOLETE         fi->fsr.regs[regno + 1] = offset + 4; */
 141 /* OBSOLETE     } */
 142 /* OBSOLETE       else if ((insn & 0xffff8000) == 0x086c8000)   /* addu xx, r1, r1 */ */
 143 /* OBSOLETE     fi->framesize = -offset; */
 144 /* OBSOLETE       else if ((insn & 0xffff8000) == 0xf06c8000)   /* addu xx, r1, r30 */ */
 145 /* OBSOLETE     { */
 146 /* OBSOLETE       fi->framereg = FP_REGNUM;     /* fp is now valid */ */
 147 /* OBSOLETE       fi->frameoffset = offset; */
 148 /* OBSOLETE       break;                /* end of stack adjustments */ */
 149 /* OBSOLETE     } */
 150 /* OBSOLETE       else if (insn == 0xf03b2001)  /* addu r1, r0, r30 */ */
 151 /* OBSOLETE     { */
 152 /* OBSOLETE       fi->framereg = FP_REGNUM;     /* fp is now valid */ */
 153 /* OBSOLETE       fi->frameoffset = 0; */
 154 /* OBSOLETE       break;                /* end of stack adjustments */ */
 155 /* OBSOLETE     } */
 156 /* OBSOLETE       else */
 157 /* OBSOLETE /* FIXME - handle long immediate instructions */ */
 158 /* OBSOLETE     break;                  /* anything else isn't prologue */ */
 159 /* OBSOLETE     } */
 160 /* OBSOLETE } */
 161 /* OBSOLETE  */
 162 /* OBSOLETE /* Function: init_extra_frame_info */
 163 /* OBSOLETE    This function actually figures out the frame address for a given pc and */
 164 /* OBSOLETE    sp.  This is tricky on the c80 because we sometimes don't use an explicit */
 165 /* OBSOLETE    frame pointer, and the previous stack pointer isn't necessarily recorded */
 166 /* OBSOLETE    on the stack.  The only reliable way to get this info is to */
 167 /* OBSOLETE    examine the prologue.  */ */
 168 /* OBSOLETE  */
 169 /* OBSOLETE void */
 170 /* OBSOLETE tic80_init_extra_frame_info (struct frame_info *fi) */
 171 /* OBSOLETE { */
 172 /* OBSOLETE   int reg; */
 173 /* OBSOLETE  */
 174 /* OBSOLETE   if (fi->next) */
 175 /* OBSOLETE     fi->pc = FRAME_SAVED_PC (fi->next); */
 176 /* OBSOLETE  */
 177 /* OBSOLETE   /* Because zero is a valid register offset relative to SP, we initialize */
 178 /* OBSOLETE      the offsets to -1 to indicate unused entries.  */ */
 179 /* OBSOLETE   for (reg = 0; reg < NUM_REGS; reg++) */
 180 /* OBSOLETE     fi->fsr.regs[reg] = -1; */
 181 /* OBSOLETE  */
 182 /* OBSOLETE   if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
 183 /* OBSOLETE     { */
 184 /* OBSOLETE       /* We need to setup fi->frame here because run_stack_dummy gets it wrong */
 185 /* OBSOLETE          by assuming it's always FP.  */ */
 186 /* OBSOLETE       fi->frame = generic_read_register_dummy (fi->pc, fi->frame, SP_REGNUM); */
 187 /* OBSOLETE       fi->framesize = 0; */
 188 /* OBSOLETE       fi->frameoffset = 0; */
 189 /* OBSOLETE       return; */
 190 /* OBSOLETE     } */
 191 /* OBSOLETE   else */
 192 /* OBSOLETE     { */
 193 /* OBSOLETE       tic80_scan_prologue (fi); */
 194 /* OBSOLETE  */
 195 /* OBSOLETE       if (!fi->next)                /* this is the innermost frame? */ */
 196 /* OBSOLETE     fi->frame = read_register (fi->framereg); */
 197 /* OBSOLETE       else */
 198 /* OBSOLETE     /* not the innermost frame */ */
 199 /* OBSOLETE     /* If this function uses FP as the frame register, and the function */
 200 /* OBSOLETE        it called saved the FP, get the saved FP.  */ if (fi->framereg == FP_REGNUM && */
 201 /* OBSOLETE                          fi->next->fsr.regs[FP_REGNUM] != (unsigned) -1) */
 202 /* OBSOLETE     fi->frame = read_memory_integer (fi->next->fsr.regs[FP_REGNUM], 4); */
 203 /* OBSOLETE  */
 204 /* OBSOLETE       /* Convert SP-relative offsets of saved registers to real addresses.  */ */
 205 /* OBSOLETE       for (reg = 0; reg < NUM_REGS; reg++) */
 206 /* OBSOLETE     if (fi->fsr.regs[reg] == (unsigned) -1) */
 207 /* OBSOLETE       fi->fsr.regs[reg] = 0;        /* unused entry */ */
 208 /* OBSOLETE     else */
 209 /* OBSOLETE       fi->fsr.regs[reg] += fi->frame - fi->frameoffset; */
 210 /* OBSOLETE     } */
 211 /* OBSOLETE } */
 212 /* OBSOLETE  */
 213 /* OBSOLETE /* Function: find_callers_reg */
 214 /* OBSOLETE    Find REGNUM on the stack.  Otherwise, it's in an active register.  One thing */
 215 /* OBSOLETE    we might want to do here is to check REGNUM against the clobber mask, and */
 216 /* OBSOLETE    somehow flag it as invalid if it isn't saved on the stack somewhere.  This */
 217 /* OBSOLETE    would provide a graceful failure mode when trying to get the value of */
 218 /* OBSOLETE    caller-saves registers for an inner frame.  */ */
 219 /* OBSOLETE  */
 220 /* OBSOLETE CORE_ADDR */
 221 /* OBSOLETE tic80_find_callers_reg (struct frame_info *fi, int regnum) */
 222 /* OBSOLETE { */
 223 /* OBSOLETE   for (; fi; fi = fi->next) */
 224 /* OBSOLETE     if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
 225 /* OBSOLETE       return generic_read_register_dummy (fi->pc, fi->frame, regnum); */
 226 /* OBSOLETE     else if (fi->fsr.regs[regnum] != 0) */
 227 /* OBSOLETE       return read_memory_integer (fi->fsr.regs[regnum], */
 228 /* OBSOLETE                               REGISTER_RAW_SIZE (regnum)); */
 229 /* OBSOLETE   return read_register (regnum); */
 230 /* OBSOLETE } */
 231 /* OBSOLETE  */
 232 /* OBSOLETE /* Function: frame_chain */
 233 /* OBSOLETE    Given a GDB frame, determine the address of the calling function's frame. */
 234 /* OBSOLETE    This will be used to create a new GDB frame struct, and then */
 235 /* OBSOLETE    INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame. */
 236 /* OBSOLETE    For c80, we save the frame size when we initialize the frame_info.  */ */
 237 /* OBSOLETE  */
 238 /* OBSOLETE CORE_ADDR */
 239 /* OBSOLETE tic80_frame_chain (struct frame_info *fi) */
 240 /* OBSOLETE { */
 241 /* OBSOLETE   CORE_ADDR fn_start, callers_pc, fp; */
 242 /* OBSOLETE  */
 243 /* OBSOLETE   /* is this a dummy frame? */ */
 244 /* OBSOLETE   if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
 245 /* OBSOLETE     return fi->frame;               /* dummy frame same as caller's frame */ */
 246 /* OBSOLETE  */
 247 /* OBSOLETE   /* is caller-of-this a dummy frame? */ */
 248 /* OBSOLETE   callers_pc = FRAME_SAVED_PC (fi); /* find out who called us: */ */
 249 /* OBSOLETE   fp = tic80_find_callers_reg (fi, FP_REGNUM); */
 250 /* OBSOLETE   if (PC_IN_CALL_DUMMY (callers_pc, fp, fp)) */
 251 /* OBSOLETE     return fp;                      /* dummy frame's frame may bear no relation to ours */ */
 252 /* OBSOLETE  */
 253 /* OBSOLETE   if (find_pc_partial_function (fi->pc, 0, &fn_start, 0)) */
 254 /* OBSOLETE     if (fn_start == entry_point_address ()) */
 255 /* OBSOLETE       return 0;                     /* in _start fn, don't chain further */ */
 256 /* OBSOLETE  */
 257 /* OBSOLETE   if (fi->framereg == FP_REGNUM) */
 258 /* OBSOLETE     return tic80_find_callers_reg (fi, FP_REGNUM); */
 259 /* OBSOLETE   else */
 260 /* OBSOLETE     return fi->frame + fi->framesize; */
 261 /* OBSOLETE } */
 262 /* OBSOLETE  */
 263 /* OBSOLETE /* Function: pop_frame */
 264 /* OBSOLETE    Discard from the stack the innermost frame, */
 265 /* OBSOLETE    restoring all saved registers.  */ */
 266 /* OBSOLETE  */
 267 /* OBSOLETE struct frame_info * */
 268 /* OBSOLETE tic80_pop_frame (struct frame_info *frame) */
 269 /* OBSOLETE { */
 270 /* OBSOLETE   int regnum; */
 271 /* OBSOLETE  */
 272 /* OBSOLETE   if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) */
 273 /* OBSOLETE     generic_pop_dummy_frame (); */
 274 /* OBSOLETE   else */
 275 /* OBSOLETE     { */
 276 /* OBSOLETE       for (regnum = 0; regnum < NUM_REGS; regnum++) */
 277 /* OBSOLETE     if (frame->fsr.regs[regnum] != 0) */
 278 /* OBSOLETE       write_register (regnum, */
 279 /* OBSOLETE                       read_memory_integer (frame->fsr.regs[regnum], 4)); */
 280 /* OBSOLETE  */
 281 /* OBSOLETE       write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); */
 282 /* OBSOLETE       write_register (SP_REGNUM, read_register (FP_REGNUM)); */
 283 /* OBSOLETE #if 0 */
 284 /* OBSOLETE       if (read_register (PSW_REGNUM) & 0x80) */
 285 /* OBSOLETE     write_register (SPU_REGNUM, read_register (SP_REGNUM)); */
 286 /* OBSOLETE       else */
 287 /* OBSOLETE     write_register (SPI_REGNUM, read_register (SP_REGNUM)); */
 288 /* OBSOLETE #endif */
 289 /* OBSOLETE     } */
 290 /* OBSOLETE   flush_cached_frames (); */
 291 /* OBSOLETE   return NULL; */
 292 /* OBSOLETE } */
 293 /* OBSOLETE  */
 294 /* OBSOLETE /* Function: frame_saved_pc */
 295 /* OBSOLETE    Find the caller of this frame.  We do this by seeing if LR_REGNUM is saved */
 296 /* OBSOLETE    in the stack anywhere, otherwise we get it from the registers. */ */
 297 /* OBSOLETE  */
 298 /* OBSOLETE CORE_ADDR */
 299 /* OBSOLETE tic80_frame_saved_pc (struct frame_info *fi) */
 300 /* OBSOLETE { */
 301 /* OBSOLETE   if (PC_IN_CALL_DUMMY (fi->pc, fi->frame, fi->frame)) */
 302 /* OBSOLETE     return generic_read_register_dummy (fi->pc, fi->frame, PC_REGNUM); */
 303 /* OBSOLETE   else */
 304 /* OBSOLETE     return tic80_find_callers_reg (fi, LR_REGNUM); */
 305 /* OBSOLETE } */
 306 /* OBSOLETE  */
 307 /* OBSOLETE /* Function: tic80_push_return_address (pc, sp) */
 308 /* OBSOLETE    Set up the return address for the inferior function call. */
 309 /* OBSOLETE    Necessary for targets that don't actually execute a JSR/BSR instruction  */
 310 /* OBSOLETE    (ie. when using an empty CALL_DUMMY) */ */
 311 /* OBSOLETE  */
 312 /* OBSOLETE CORE_ADDR */
 313 /* OBSOLETE tic80_push_return_address (CORE_ADDR pc, CORE_ADDR sp) */
 314 /* OBSOLETE { */
 315 /* OBSOLETE   write_register (LR_REGNUM, CALL_DUMMY_ADDRESS ()); */
 316 /* OBSOLETE   return sp; */
 317 /* OBSOLETE } */
 318 /* OBSOLETE  */
 319 /* OBSOLETE  */
 320 /* OBSOLETE /* Function: push_arguments */
 321 /* OBSOLETE    Setup the function arguments for calling a function in the inferior. */
 322 /* OBSOLETE  */
 323 /* OBSOLETE    On the TI C80 architecture, there are six register pairs (R2/R3 to R12/13) */
 324 /* OBSOLETE    which are dedicated for passing function arguments.  Up to the first six */
 325 /* OBSOLETE    arguments (depending on size) may go into these registers. */
 326 /* OBSOLETE    The rest go on the stack. */
 327 /* OBSOLETE  */
 328 /* OBSOLETE    Arguments that are smaller than 4 bytes will still take up a whole */
 329 /* OBSOLETE    register or a whole 32-bit word on the stack, and will be */
 330 /* OBSOLETE    right-justified in the register or the stack word.  This includes */
 331 /* OBSOLETE    chars, shorts, and small aggregate types. */
 332 /* OBSOLETE  */
 333 /* OBSOLETE    Arguments that are four bytes or less in size are placed in the */
 334 /* OBSOLETE    even-numbered register of a register pair, and the odd-numbered */
 335 /* OBSOLETE    register is not used. */
 336 /* OBSOLETE  */
 337 /* OBSOLETE    Arguments of 8 bytes size (such as floating point doubles) are placed */
 338 /* OBSOLETE    in a register pair.  The least significant 32-bit word is placed in */
 339 /* OBSOLETE    the even-numbered register, and the most significant word in the */
 340 /* OBSOLETE    odd-numbered register. */
 341 /* OBSOLETE  */
 342 /* OBSOLETE    Aggregate types with sizes between 4 and 8 bytes are passed */
 343 /* OBSOLETE    entirely on the stack, and are left-justified within the */
 344 /* OBSOLETE    double-word (as opposed to aggregates smaller than 4 bytes */
 345 /* OBSOLETE    which are right-justified). */
 346 /* OBSOLETE  */
 347 /* OBSOLETE    Aggregates of greater than 8 bytes are first copied onto the stack,  */
 348 /* OBSOLETE    and then a pointer to the copy is passed in the place of the normal */
 349 /* OBSOLETE    argument (either in a register if available, or on the stack). */
 350 /* OBSOLETE  */
 351 /* OBSOLETE    Functions that must return an aggregate type can return it in the  */
 352 /* OBSOLETE    normal return value registers (R2 and R3) if its size is 8 bytes or */
 353 /* OBSOLETE    less.  For larger return values, the caller must allocate space for  */
 354 /* OBSOLETE    the callee to copy the return value to.  A pointer to this space is */
 355 /* OBSOLETE    passed as an implicit first argument, always in R0. */ */
 356 /* OBSOLETE  */
 357 /* OBSOLETE CORE_ADDR */
 358 /* OBSOLETE tic80_push_arguments (int nargs, value_ptr *args, CORE_ADDR sp, */
 359 /* OBSOLETE                   unsigned char struct_return, CORE_ADDR struct_addr) */
 360 /* OBSOLETE { */
 361 /* OBSOLETE   int stack_offset, stack_alloc; */
 362 /* OBSOLETE   int argreg; */
 363 /* OBSOLETE   int argnum; */
 364 /* OBSOLETE   struct type *type; */
 365 /* OBSOLETE   CORE_ADDR regval; */
 366 /* OBSOLETE   char *val; */
 367 /* OBSOLETE   char valbuf[4]; */
 368 /* OBSOLETE   int len; */
 369 /* OBSOLETE   int odd_sized_struct; */
 370 /* OBSOLETE   int is_struct; */
 371 /* OBSOLETE  */
 372 /* OBSOLETE   /* first force sp to a 4-byte alignment */ */
 373 /* OBSOLETE   sp = sp & ~3; */
 374 /* OBSOLETE  */
 375 /* OBSOLETE   argreg = ARG0_REGNUM; */
 376 /* OBSOLETE   /* The "struct return pointer" pseudo-argument goes in R0 */ */
 377 /* OBSOLETE   if (struct_return) */
 378 /* OBSOLETE     write_register (argreg++, struct_addr); */
 379 /* OBSOLETE  */
 380 /* OBSOLETE   /* Now make sure there's space on the stack */ */
 381 /* OBSOLETE   for (argnum = 0, stack_alloc = 0; */
 382 /* OBSOLETE        argnum < nargs; argnum++) */
 383 /* OBSOLETE     stack_alloc += ((TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3); */
 384 /* OBSOLETE   sp -= stack_alloc;                /* make room on stack for args */ */
 385 /* OBSOLETE  */
 386 /* OBSOLETE  */
 387 /* OBSOLETE   /* Now load as many as possible of the first arguments into */
 388 /* OBSOLETE      registers, and push the rest onto the stack.  There are 16 bytes */
 389 /* OBSOLETE      in four registers available.  Loop thru args from first to last.  */ */
 390 /* OBSOLETE  */
 391 /* OBSOLETE   argreg = ARG0_REGNUM; */
 392 /* OBSOLETE   for (argnum = 0, stack_offset = 0; argnum < nargs; argnum++) */
 393 /* OBSOLETE     { */
 394 /* OBSOLETE       type = VALUE_TYPE (args[argnum]); */
 395 /* OBSOLETE       len = TYPE_LENGTH (type); */
 396 /* OBSOLETE       memset (valbuf, 0, sizeof (valbuf)); */
 397 /* OBSOLETE       val = (char *) VALUE_CONTENTS (args[argnum]); */
 398 /* OBSOLETE  */
 399 /* OBSOLETE /* FIXME -- tic80 can take doubleword arguments in register pairs */ */
 400 /* OBSOLETE       is_struct = (type->code == TYPE_CODE_STRUCT); */
 401 /* OBSOLETE       odd_sized_struct = 0; */
 402 /* OBSOLETE  */
 403 /* OBSOLETE       if (!is_struct) */
 404 /* OBSOLETE     { */
 405 /* OBSOLETE       if (len < 4) */
 406 /* OBSOLETE         {                   /* value gets right-justified in the register or stack word */ */
 407 /* OBSOLETE           memcpy (valbuf + (4 - len), val, len); */
 408 /* OBSOLETE           val = valbuf; */
 409 /* OBSOLETE         } */
 410 /* OBSOLETE       if (len > 4 && (len & 3) != 0) */
 411 /* OBSOLETE         odd_sized_struct = 1;       /* such structs go entirely on stack */ */
 412 /* OBSOLETE     } */
 413 /* OBSOLETE       else */
 414 /* OBSOLETE     { */
 415 /* OBSOLETE       /* Structs are always passed by reference. */ */
 416 /* OBSOLETE       write_register (argreg, sp + stack_offset); */
 417 /* OBSOLETE       argreg++; */
 418 /* OBSOLETE     } */
 419 /* OBSOLETE  */
 420 /* OBSOLETE       while (len > 0) */
 421 /* OBSOLETE     { */
 422 /* OBSOLETE       if (is_struct || argreg > ARGLAST_REGNUM || odd_sized_struct) */
 423 /* OBSOLETE         {                   /* must go on the stack */ */
 424 /* OBSOLETE           write_memory (sp + stack_offset, val, 4); */
 425 /* OBSOLETE           stack_offset += 4; */
 426 /* OBSOLETE         } */
 427 /* OBSOLETE       /* NOTE WELL!!!!!  This is not an "else if" clause!!! */
 428 /* OBSOLETE          That's because some things get passed on the stack */
 429 /* OBSOLETE          AND in the registers!   */ */
 430 /* OBSOLETE       if (!is_struct && argreg <= ARGLAST_REGNUM) */
 431 /* OBSOLETE         {                   /* there's room in a register */ */
 432 /* OBSOLETE           regval = extract_address (val, REGISTER_RAW_SIZE (argreg)); */
 433 /* OBSOLETE           write_register (argreg, regval); */
 434 /* OBSOLETE           argreg += 2;      /* FIXME -- what about doubleword args? */ */
 435 /* OBSOLETE         } */
 436 /* OBSOLETE       /* Store the value 4 bytes at a time.  This means that things */
 437 /* OBSOLETE          larger than 4 bytes may go partly in registers and partly */
 438 /* OBSOLETE          on the stack.  */ */
 439 /* OBSOLETE       len -= REGISTER_RAW_SIZE (argreg); */
 440 /* OBSOLETE       val += REGISTER_RAW_SIZE (argreg); */
 441 /* OBSOLETE     } */
 442 /* OBSOLETE     } */
 443 /* OBSOLETE   return sp; */
 444 /* OBSOLETE } */
 445 /* OBSOLETE  */
 446 /* OBSOLETE /* Function: tic80_write_sp */
 447 /* OBSOLETE    Because SP is really a read-only register that mirrors either SPU or SPI, */
 448 /* OBSOLETE    we must actually write one of those two as well, depending on PSW. */ */
 449 /* OBSOLETE  */
 450 /* OBSOLETE void */
 451 /* OBSOLETE tic80_write_sp (CORE_ADDR val) */
 452 /* OBSOLETE { */
 453 /* OBSOLETE #if 0 */
 454 /* OBSOLETE   unsigned long psw = read_register (PSW_REGNUM); */
 455 /* OBSOLETE  */
 456 /* OBSOLETE   if (psw & 0x80)           /* stack mode: user or interrupt */ */
 457 /* OBSOLETE     write_register (SPU_REGNUM, val); */
 458 /* OBSOLETE   else */
 459 /* OBSOLETE     write_register (SPI_REGNUM, val); */
 460 /* OBSOLETE #endif */
 461 /* OBSOLETE   write_register (SP_REGNUM, val); */
 462 /* OBSOLETE } */
 463 /* OBSOLETE  */
 464 /* OBSOLETE void */
 465 /* OBSOLETE _initialize_tic80_tdep (void) */
 466 /* OBSOLETE { */
 467 /* OBSOLETE   tm_print_insn = print_insn_tic80; */
 468 /* OBSOLETE } */