boehm-gc/mach_dep.c

   1 /*
   2  * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
   3  * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
   4  *
   5  * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
   6  * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
   7  *
   8  * Permission is hereby granted to use or copy this program
   9  * for any purpose,  provided the above notices are retained on all copies.
  10  * Permission to modify the code and to distribute modified code is granted,
  11  * provided the above notices are retained, and a notice that the code was
  12  * modified is included with the above copyright notice.
  13  */
  14 /* Boehm, November 17, 1995 12:13 pm PST */
  15 # include "private/gc_priv.h"
  16 # include <stdio.h>
  17 # include <setjmp.h>
  18 # if defined(OS2) || defined(CX_UX)
  19 #   define _setjmp(b) setjmp(b)
  20 #   define _longjmp(b,v) longjmp(b,v)
  21 # endif
  22 # ifdef AMIGA
  23 #   ifndef __GNUC__
  24 #     include <dos.h>
  25 #   else
  26 #     include <machine/reg.h>
  27 #   endif
  28 # endif
  29
  30 #if defined(__MWERKS__) && !defined(POWERPC)
  31
  32 asm static void PushMacRegisters()
  33 {
  34     sub.w   #4,sp                   // reserve space for one parameter.
  35     move.l  a2,(sp)
  36     jsr         GC_push_one
  37     move.l  a3,(sp)
  38     jsr         GC_push_one
  39     move.l  a4,(sp)
  40     jsr         GC_push_one
  41 #   if !__option(a6frames)
  42         // <pcb> perhaps a6 should be pushed if stack frames are not being used.
  43         move.l  a6,(sp)
  44         jsr             GC_push_one
  45 #   endif
  46         // skip a5 (globals), a6 (frame pointer), and a7 (stack pointer)
  47     move.l  d2,(sp)
  48     jsr         GC_push_one
  49     move.l  d3,(sp)
  50     jsr         GC_push_one
  51     move.l  d4,(sp)
  52     jsr         GC_push_one
  53     move.l  d5,(sp)
  54     jsr         GC_push_one
  55     move.l  d6,(sp)
  56     jsr         GC_push_one
  57     move.l  d7,(sp)
  58     jsr         GC_push_one
  59     add.w   #4,sp                   // fix stack.
  60     rts
  61 }
  62
  63 #endif /* __MWERKS__ */
  64
  65 # if defined(SPARC) || defined(IA64)
  66     /* Value returned from register flushing routine; either sp (SPARC) */
  67     /* or ar.bsp (IA64)                                                 */
  68     word GC_save_regs_ret_val;
  69 # endif
  70
  71 /* Routine to mark from registers that are preserved by the C compiler. */
  72 /* This must be ported to every new architecture.  There is a generic   */
  73 /* version at the end, that is likely, but not guaranteed to work       */
  74 /* on your architecture.  Run the test_setjmp program to see whether    */
  75 /* there is any chance it will work.                                    */
  76
  77 #ifndef USE_GENERIC_PUSH_REGS
  78 void GC_push_regs()
  79 {
  80 #       ifdef RT
  81           register long TMP_SP; /* must be bound to r11 */
  82 #       endif
  83
  84 #       ifdef VAX
  85           /* VAX - generic code below does not work under 4.2 */
  86           /* r1 through r5 are caller save, and therefore     */
  87           /* on the stack or dead.                            */
  88           asm("pushl r11");     asm("calls $1,_GC_push_one");
  89           asm("pushl r10");     asm("calls $1,_GC_push_one");
  90           asm("pushl r9");      asm("calls $1,_GC_push_one");
  91           asm("pushl r8");      asm("calls $1,_GC_push_one");
  92           asm("pushl r7");      asm("calls $1,_GC_push_one");
  93           asm("pushl r6");      asm("calls $1,_GC_push_one");
  94 #       endif
  95 #       if defined(M68K) && (defined(SUNOS4) || defined(NEXT))
  96         /*  M68K SUNOS - could be replaced by generic code */
  97           /* a0, a1 and d1 are caller save          */
  98           /*  and therefore are on stack or dead.   */
  99
 100           asm("subqw #0x4,sp");         /* allocate word on top of stack */
 101
 102           asm("movl a2,sp@");   asm("jbsr _GC_push_one");
 103           asm("movl a3,sp@");   asm("jbsr _GC_push_one");
 104           asm("movl a4,sp@");   asm("jbsr _GC_push_one");
 105           asm("movl a5,sp@");   asm("jbsr _GC_push_one");
 106           /* Skip frame pointer and stack pointer */
 107           asm("movl d1,sp@");   asm("jbsr _GC_push_one");
 108           asm("movl d2,sp@");   asm("jbsr _GC_push_one");
 109           asm("movl d3,sp@");   asm("jbsr _GC_push_one");
 110           asm("movl d4,sp@");   asm("jbsr _GC_push_one");
 111           asm("movl d5,sp@");   asm("jbsr _GC_push_one");
 112           asm("movl d6,sp@");   asm("jbsr _GC_push_one");
 113           asm("movl d7,sp@");   asm("jbsr _GC_push_one");
 114
 115           asm("addqw #0x4,sp");         /* put stack back where it was  */
 116 #       endif
 117
 118 #       if defined(M68K) && defined(HP)
 119         /*  M68K HP - could be replaced by generic code */
 120           /* a0, a1 and d1 are caller save.  */
 121
 122           asm("subq.w &0x4,%sp");       /* allocate word on top of stack */
 123
 124           asm("mov.l %a2,(%sp)"); asm("jsr _GC_push_one");
 125           asm("mov.l %a3,(%sp)"); asm("jsr _GC_push_one");
 126           asm("mov.l %a4,(%sp)"); asm("jsr _GC_push_one");
 127           asm("mov.l %a5,(%sp)"); asm("jsr _GC_push_one");
 128           /* Skip frame pointer and stack pointer */
 129           asm("mov.l %d1,(%sp)"); asm("jsr _GC_push_one");
 130           asm("mov.l %d2,(%sp)"); asm("jsr _GC_push_one");
 131           asm("mov.l %d3,(%sp)"); asm("jsr _GC_push_one");
 132           asm("mov.l %d4,(%sp)"); asm("jsr _GC_push_one");
 133           asm("mov.l %d5,(%sp)"); asm("jsr _GC_push_one");
 134           asm("mov.l %d6,(%sp)"); asm("jsr _GC_push_one");
 135           asm("mov.l %d7,(%sp)"); asm("jsr _GC_push_one");
 136
 137           asm("addq.w &0x4,%sp");       /* put stack back where it was  */
 138 #       endif /* M68K HP */
 139
 140 #       if defined(M68K) && defined(AMIGA)
 141          /*  AMIGA - could be replaced by generic code                  */
 142          /* a0, a1, d0 and d1 are caller save */
 143
 144 #        ifdef __GNUC__
 145           asm("subq.w &0x4,%sp");       /* allocate word on top of stack */
 146
 147           asm("mov.l %a2,(%sp)"); asm("jsr _GC_push_one");
 148           asm("mov.l %a3,(%sp)"); asm("jsr _GC_push_one");
 149           asm("mov.l %a4,(%sp)"); asm("jsr _GC_push_one");
 150           asm("mov.l %a5,(%sp)"); asm("jsr _GC_push_one");
 151           asm("mov.l %a6,(%sp)"); asm("jsr _GC_push_one");
 152           /* Skip frame pointer and stack pointer */
 153           asm("mov.l %d2,(%sp)"); asm("jsr _GC_push_one");
 154           asm("mov.l %d3,(%sp)"); asm("jsr _GC_push_one");
 155           asm("mov.l %d4,(%sp)"); asm("jsr _GC_push_one");
 156           asm("mov.l %d5,(%sp)"); asm("jsr _GC_push_one");
 157           asm("mov.l %d6,(%sp)"); asm("jsr _GC_push_one");
 158           asm("mov.l %d7,(%sp)"); asm("jsr _GC_push_one");
 159
 160           asm("addq.w &0x4,%sp");       /* put stack back where it was  */
 161 #        else /* !__GNUC__ */
 162           GC_push_one(getreg(REG_A2));
 163           GC_push_one(getreg(REG_A3));
 164 #         ifndef __SASC
 165               /* Can probably be changed to #if 0 -Kjetil M. (a4=globals)*/
 166             GC_push_one(getreg(REG_A4));
 167 #         endif
 168           GC_push_one(getreg(REG_A5));
 169           GC_push_one(getreg(REG_A6));
 170           /* Skip stack pointer */
 171           GC_push_one(getreg(REG_D2));
 172           GC_push_one(getreg(REG_D3));
 173           GC_push_one(getreg(REG_D4));
 174           GC_push_one(getreg(REG_D5));
 175           GC_push_one(getreg(REG_D6));
 176           GC_push_one(getreg(REG_D7));
 177 #        endif /* !__GNUC__ */
 178 #       endif /* AMIGA */
 179
 180 #       if defined(M68K) && defined(MACOS)
 181 #       if defined(THINK_C)
 182 #         define PushMacReg(reg) \
 183               move.l  reg,(sp) \
 184               jsr             GC_push_one
 185           asm {
 186               sub.w   #4,sp                   ; reserve space for one parameter.
 187               PushMacReg(a2);
 188               PushMacReg(a3);
 189               PushMacReg(a4);
 190               ; skip a5 (globals), a6 (frame pointer), and a7 (stack pointer)
 191               PushMacReg(d2);
 192               PushMacReg(d3);
 193               PushMacReg(d4);
 194               PushMacReg(d5);
 195               PushMacReg(d6);
 196               PushMacReg(d7);
 197               add.w   #4,sp                   ; fix stack.
 198           }
 199 #         undef PushMacReg
 200 #       endif /* THINK_C */
 201 #       if defined(__MWERKS__)
 202           PushMacRegisters();
 203 #       endif   /* __MWERKS__ */
 204 #   endif       /* MACOS */
 205
 206 #       if defined(I386) &&!defined(OS2) &&!defined(SVR4) \
 207         && (defined(__MINGW32__) || !defined(MSWIN32)) \
 208         && !defined(SCO) && !defined(SCO_ELF) \
 209         && !(defined(LINUX) && defined(__ELF__)) \
 210         && !(defined(FREEBSD) && defined(__ELF__)) \
 211         && !(defined(NETBSD) && defined(__ELF__)) \
 212         && !(defined(OPENBSD) && defined(__ELF__)) \
 213         && !(defined(BEOS) && defined(__ELF__)) \
 214         && !defined(DOS4GW) && !defined(HURD)
 215         /* I386 code, generic code does not appear to work */
 216         /* It does appear to work under OS2, and asms dont */
 217         /* This is used for some 38g UNIX variants and for CYGWIN32 */
 218           asm("pushl %eax");  asm("call _GC_push_one"); asm("addl $4,%esp");
 219           asm("pushl %ecx");  asm("call _GC_push_one"); asm("addl $4,%esp");
 220           asm("pushl %edx");  asm("call _GC_push_one"); asm("addl $4,%esp");
 221           asm("pushl %ebp");  asm("call _GC_push_one"); asm("addl $4,%esp");
 222           asm("pushl %esi");  asm("call _GC_push_one"); asm("addl $4,%esp");
 223           asm("pushl %edi");  asm("call _GC_push_one"); asm("addl $4,%esp");
 224           asm("pushl %ebx");  asm("call _GC_push_one"); asm("addl $4,%esp");
 225 #       endif
 226
 227 #       if ( defined(I386) && defined(LINUX) && defined(__ELF__) ) \
 228         || ( defined(I386) && defined(FREEBSD) && defined(__ELF__) ) \
 229         || ( defined(I386) && defined(NETBSD) && defined(__ELF__) ) \
 230         || ( defined(I386) && defined(OPENBSD) && defined(__ELF__) ) \
 231         || ( defined(I386) && defined(HURD) && defined(__ELF__) )
 232
 233         /* This is modified for Linux with ELF (Note: _ELF_ only) */
 234         /* This section handles FreeBSD with ELF. */
 235         /* Eax is caller-save and dead here.  Other caller-save         */
 236         /* registers could also be skipped.  We assume there are no     */
 237         /* pointers in MMX registers, etc.                              */
 238         /* We combine instructions in a single asm to prevent gcc from  */
 239         /* inserting code in the middle.                                */
 240           asm("pushl %ecx; call GC_push_one; addl $4,%esp");
 241           asm("pushl %edx; call GC_push_one; addl $4,%esp");
 242           asm("pushl %ebp; call GC_push_one; addl $4,%esp");
 243           asm("pushl %esi; call GC_push_one; addl $4,%esp");
 244           asm("pushl %edi; call GC_push_one; addl $4,%esp");
 245           asm("pushl %ebx; call GC_push_one; addl $4,%esp");
 246 #       endif
 247
 248 #       if ( defined(I386) && defined(BEOS) && defined(__ELF__) )
 249         /* As far as I can understand from                              */
 250         /* http://www.beunited.org/articles/jbq/nasm.shtml,             */
 251         /* only ebp, esi, edi and ebx are not scratch. How MMX          */
 252         /* etc. registers should be treated, I have no idea.            */
 253           asm("pushl %ebp; call GC_push_one; addl $4,%esp");
 254           asm("pushl %esi; call GC_push_one; addl $4,%esp");
 255           asm("pushl %edi; call GC_push_one; addl $4,%esp");
 256           asm("pushl %ebx; call GC_push_one; addl $4,%esp");
 257 #       endif
 258
 259 #       if defined(I386) && defined(MSWIN32) && !defined(__MINGW32__) \
 260            && !defined(USE_GENERIC)
 261         /* I386 code, Microsoft variant         */
 262           __asm  push eax
 263           __asm  call GC_push_one
 264           __asm  add esp,4
 265           __asm  push ebx
 266           __asm  call GC_push_one
 267           __asm  add esp,4
 268           __asm  push ecx
 269           __asm  call GC_push_one
 270           __asm  add esp,4
 271           __asm  push edx
 272           __asm  call GC_push_one
 273           __asm  add esp,4
 274           __asm  push ebp
 275           __asm  call GC_push_one
 276           __asm  add esp,4
 277           __asm  push esi
 278           __asm  call GC_push_one
 279           __asm  add esp,4
 280           __asm  push edi
 281           __asm  call GC_push_one
 282           __asm  add esp,4
 283 #       endif
 284
 285 #       if defined(I386) && (defined(SVR4) || defined(SCO) || defined(SCO_ELF))
 286         /* I386 code, SVR4 variant, generic code does not appear to work */
 287           asm("pushl %eax");  asm("call GC_push_one"); asm("addl $4,%esp");
 288           asm("pushl %ebx");  asm("call GC_push_one"); asm("addl $4,%esp");
 289           asm("pushl %ecx");  asm("call GC_push_one"); asm("addl $4,%esp");
 290           asm("pushl %edx");  asm("call GC_push_one"); asm("addl $4,%esp");
 291           asm("pushl %ebp");  asm("call GC_push_one"); asm("addl $4,%esp");
 292           asm("pushl %esi");  asm("call GC_push_one"); asm("addl $4,%esp");
 293           asm("pushl %edi");  asm("call GC_push_one"); asm("addl $4,%esp");
 294 #       endif
 295
 296 #       ifdef NS32K
 297           asm ("movd r3, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
 298           asm ("movd r4, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
 299           asm ("movd r5, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
 300           asm ("movd r6, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
 301           asm ("movd r7, tos"); asm ("bsr ?_GC_push_one"); asm ("adjspb $-4");
 302 #       endif
 303
 304 #       if defined(SPARC)
 305           {
 306               word GC_save_regs_in_stack();
 307
 308               GC_save_regs_ret_val = GC_save_regs_in_stack();
 309           }
 310 #       endif
 311
 312 #       ifdef RT
 313             GC_push_one(TMP_SP);    /* GC_push_one from r11 */
 314
 315             asm("cas r11, r6, r0"); GC_push_one(TMP_SP);        /* r6 */
 316             asm("cas r11, r7, r0"); GC_push_one(TMP_SP);        /* through */
 317             asm("cas r11, r8, r0"); GC_push_one(TMP_SP);        /* r10 */
 318             asm("cas r11, r9, r0"); GC_push_one(TMP_SP);
 319             asm("cas r11, r10, r0"); GC_push_one(TMP_SP);
 320
 321             asm("cas r11, r12, r0"); GC_push_one(TMP_SP); /* r12 */
 322             asm("cas r11, r13, r0"); GC_push_one(TMP_SP); /* through */
 323             asm("cas r11, r14, r0"); GC_push_one(TMP_SP); /* r15 */
 324             asm("cas r11, r15, r0"); GC_push_one(TMP_SP);
 325 #       endif
 326
 327 #       if defined(M68K) && defined(SYSV)
 328         /*  Once again similar to SUN and HP, though setjmp appears to work.
 329                 --Parag
 330          */
 331 #        ifdef __GNUC__
 332           asm("subqw #0x4,%sp");        /* allocate word on top of stack */
 333
 334           asm("movl %a2,%sp@"); asm("jbsr GC_push_one");
 335           asm("movl %a3,%sp@"); asm("jbsr GC_push_one");
 336           asm("movl %a4,%sp@"); asm("jbsr GC_push_one");
 337           asm("movl %a5,%sp@"); asm("jbsr GC_push_one");
 338           /* Skip frame pointer and stack pointer */
 339           asm("movl %d1,%sp@"); asm("jbsr GC_push_one");
 340           asm("movl %d2,%sp@"); asm("jbsr GC_push_one");
 341           asm("movl %d3,%sp@"); asm("jbsr GC_push_one");
 342           asm("movl %d4,%sp@"); asm("jbsr GC_push_one");
 343           asm("movl %d5,%sp@"); asm("jbsr GC_push_one");
 344           asm("movl %d6,%sp@"); asm("jbsr GC_push_one");
 345           asm("movl %d7,%sp@"); asm("jbsr GC_push_one");
 346
 347           asm("addqw #0x4,%sp");        /* put stack back where it was  */
 348 #        else /* !__GNUC__*/
 349           asm("subq.w &0x4,%sp");       /* allocate word on top of stack */
 350
 351           asm("mov.l %a2,(%sp)"); asm("jsr GC_push_one");
 352           asm("mov.l %a3,(%sp)"); asm("jsr GC_push_one");
 353           asm("mov.l %a4,(%sp)"); asm("jsr GC_push_one");
 354           asm("mov.l %a5,(%sp)"); asm("jsr GC_push_one");
 355           /* Skip frame pointer and stack pointer */
 356           asm("mov.l %d1,(%sp)"); asm("jsr GC_push_one");
 357           asm("mov.l %d2,(%sp)"); asm("jsr GC_push_one");
 358           asm("mov.l %d3,(%sp)"); asm("jsr GC_push_one");
 359           asm("mov.l %d4,(%sp)"); asm("jsr GC_push_one");
 360           asm("mov.l %d5,(%sp)"); asm("jsr GC_push_one");
 361           asm("mov.l %d6,(%sp)"); asm("jsr GC_push_one");
 362           asm("mov.l %d7,(%sp)"); asm("jsr GC_push_one");
 363
 364           asm("addq.w &0x4,%sp");       /* put stack back where it was  */
 365 #        endif /* !__GNUC__ */
 366 #       endif /* M68K/SYSV */
 367
 368 #     if defined(PJ)
 369         {
 370             register int * sp asm ("optop");
 371             extern int *__libc_stack_end;
 372
 373             GC_push_all_stack (sp, __libc_stack_end);
 374         }
 375 #     endif
 376
 377       /* other machines... */
 378 #       if !defined(M68K) && !defined(VAX) && !defined(RT)
 379 #       if !defined(SPARC) && !defined(I386) && !defined(NS32K)
 380 #       if !defined(POWERPC) && !defined(UTS4)
 381 #       if !defined(PJ) && !(defined(MIPS) && defined(LINUX))
 382             --> bad news <--
 383 #       endif
 384 #       endif
 385 #       endif
 386 #       endif
 387 }
 388 #endif /* !USE_GENERIC_PUSH_REGS */
 389
 390 #if defined(USE_GENERIC_PUSH_REGS)
 391 void GC_generic_push_regs(cold_gc_frame)
 392 ptr_t cold_gc_frame;
 393 {
 394         {
 395 #           ifdef HAVE_BUILTIN_UNWIND_INIT
 396               /* This was suggested by Richard Henderson as the way to  */
 397               /* force callee-save registers and register windows onto  */
 398               /* the stack.                                             */
 399               __builtin_unwind_init();
 400 #           else /* !HAVE_BUILTIN_UNWIND_INIT */
 401               /* Generic code                          */
 402               /* The idea is due to Parag Patel at HP. */
 403               /* We're not sure whether he would like  */
 404               /* to be he acknowledged for it or not.  */
 405               jmp_buf regs;
 406               register word * i = (word *) regs;
 407               register ptr_t lim = (ptr_t)(regs) + (sizeof regs);
 408
 409               /* Setjmp doesn't always clear all of the buffer.         */
 410               /* That tends to preserve garbage.  Clear it.             */
 411                 for (; (char *)i < lim; i++) {
 412                     *i = 0;
 413                 }
 414 #             if defined(POWERPC) || defined(MSWIN32) || defined(MSWINCE) \
 415                 || defined(UTS4) || defined(LINUX) || defined(EWS4800)
 416                   (void) setjmp(regs);
 417 #             else
 418                   (void) _setjmp(regs);
 419 #             endif
 420 #           endif /* !HAVE_BUILTIN_UNWIND_INIT */
 421 #           if (defined(SPARC) && !defined(HAVE_BUILTIN_UNWIND_INIT)) \
 422                 || defined(IA64)
 423               /* On a register window machine, we need to save register */
 424               /* contents on the stack for this to work.  The setjmp    */
 425               /* is probably not needed on SPARC, since pointers are    */
 426               /* only stored in windowed or scratch registers.  It is   */
 427               /* needed on IA64, since some non-windowed registers are  */
 428               /* preserved.                                             */
 429               {
 430                 word GC_save_regs_in_stack();
 431
 432                 GC_save_regs_ret_val = GC_save_regs_in_stack();
 433                 /* On IA64 gcc, could use __builtin_ia64_flushrs() and  */
 434                 /* __builtin_ia64_flushrs().  The latter will be done   */
 435                 /* implicitly by __builtin_unwind_init() for gcc3.0.1   */
 436                 /* and later.                                           */
 437               }
 438 #           endif
 439             GC_push_current_stack(cold_gc_frame);
 440         }
 441 }
 442 #endif /* USE_GENERIC_PUSH_REGS */
 443
 444 /* On register window machines, we need a way to force registers into   */
 445 /* the stack.   Return sp.                                              */
 446 # ifdef SPARC
 447     asm("       .seg    \"text\"");
 448 #   ifdef SVR4
 449       asm("     .globl  GC_save_regs_in_stack");
 450       asm("GC_save_regs_in_stack:");
 451       asm("     .type GC_save_regs_in_stack,#function");
 452 #   else
 453       asm("     .globl  _GC_save_regs_in_stack");
 454       asm("_GC_save_regs_in_stack:");
 455 #   endif
 456 #   if defined(__arch64__) || defined(__sparcv9)
 457       asm("     save    %sp,-128,%sp");
 458       asm("     flushw");
 459       asm("     ret");
 460       asm("     restore %sp,2047+128,%o0");
 461 #   else
 462       asm("     ta      0x3   ! ST_FLUSH_WINDOWS");
 463       asm("     retl");
 464       asm("     mov     %sp,%o0");
 465 #   endif
 466 #   ifdef SVR4
 467       asm("     .GC_save_regs_in_stack_end:");
 468       asm("     .size GC_save_regs_in_stack,.GC_save_regs_in_stack_end-GC_save_regs_in_stack");
 469 #   endif
 470 #   ifdef LINT
 471         word GC_save_regs_in_stack() { return(0 /* sp really */);}
 472 #   endif
 473 # endif
 474
 475 /* On IA64, we also need to flush register windows.  But they end       */
 476 /* up on the other side of the stack segment.                           */
 477 /* Returns the backing store pointer for the register stack.            */
 478 /* We now implement this as a separate assembly file, since inline      */
 479 /* assembly code here doesn't work with either the Intel or HP          */
 480 /* compilers.                                                           */
 481 # if 0
 482 #   ifdef LINUX
 483         asm("        .text");
 484         asm("        .psr abi64");
 485         asm("        .psr lsb");
 486         asm("        .lsb");
 487         asm("");
 488         asm("        .text");
 489         asm("        .align 16");
 490         asm("        .global GC_save_regs_in_stack");
 491         asm("        .proc GC_save_regs_in_stack");
 492         asm("GC_save_regs_in_stack:");
 493         asm("        .body");
 494         asm("        flushrs");
 495         asm("        ;;");
 496         asm("        mov r8=ar.bsp");
 497         asm("        br.ret.sptk.few rp");
 498         asm("        .endp GC_save_regs_in_stack");
 499 #   endif /* LINUX */
 500 #   if 0 /* Other alternatives that don't work on HP/UX */
 501         word GC_save_regs_in_stack() {
 502 #         if USE_BUILTINS
 503             __builtin_ia64_flushrs();
 504             return __builtin_ia64_bsp();
 505 #         else
 506 #           ifdef HPUX
 507               _asm("        flushrs");
 508               _asm("        ;;");
 509               _asm("        mov r8=ar.bsp");
 510               _asm("        br.ret.sptk.few rp");
 511 #           else
 512               asm("        flushrs");
 513               asm("        ;;");
 514               asm("        mov r8=ar.bsp");
 515               asm("        br.ret.sptk.few rp");
 516 #           endif
 517 #         endif
 518         }
 519 #   endif
 520 # endif
 521
 522 /* GC_clear_stack_inner(arg, limit) clears stack area up to limit and   */
 523 /* returns arg.  Stack clearing is crucial on SPARC, so we supply       */
 524 /* an assembly version that's more careful.  Assumes limit is hotter    */
 525 /* than sp, and limit is 8 byte aligned.                                */
 526 #if defined(ASM_CLEAR_CODE)
 527 #ifndef SPARC
 528         --> fix it
 529 #endif
 530 # ifdef SUNOS4
 531     asm(".globl _GC_clear_stack_inner");
 532     asm("_GC_clear_stack_inner:");
 533 # else
 534     asm(".globl GC_clear_stack_inner");
 535     asm("GC_clear_stack_inner:");
 536     asm(".type GC_save_regs_in_stack,#function");
 537 # endif
 538 #if defined(__arch64__) || defined(__sparcv9)
 539   asm("mov %sp,%o2");           /* Save sp                      */
 540   asm("add %sp,2047-8,%o3");    /* p = sp+bias-8                */
 541   asm("add %o1,-2047-192,%sp"); /* Move sp out of the way,      */
 542                                 /* so that traps still work.    */
 543                                 /* Includes some extra words    */
 544                                 /* so we can be sloppy below.   */
 545   asm("loop:");
 546   asm("stx %g0,[%o3]");         /* *(long *)p = 0               */
 547   asm("cmp %o3,%o1");
 548   asm("bgu,pt %xcc, loop");     /* if (p > limit) goto loop     */
 549     asm("add %o3,-8,%o3");      /* p -= 8 (delay slot) */
 550   asm("retl");
 551     asm("mov %o2,%sp");         /* Restore sp., delay slot      */
 552 #else
 553   asm("mov %sp,%o2");           /* Save sp      */
 554   asm("add %sp,-8,%o3");        /* p = sp-8     */
 555   asm("clr %g1");               /* [g0,g1] = 0  */
 556   asm("add %o1,-0x60,%sp");     /* Move sp out of the way,      */
 557                                 /* so that traps still work.    */
 558                                 /* Includes some extra words    */
 559                                 /* so we can be sloppy below.   */
 560   asm("loop:");
 561   asm("std %g0,[%o3]");         /* *(long long *)p = 0  */
 562   asm("cmp %o3,%o1");
 563   asm("bgu loop ");             /* if (p > limit) goto loop     */
 564     asm("add %o3,-8,%o3");      /* p -= 8 (delay slot) */
 565   asm("retl");
 566     asm("mov %o2,%sp");         /* Restore sp., delay slot      */
 567 #endif /* old SPARC */
 568   /* First argument = %o0 = return value */
 569 #   ifdef SVR4
 570       asm("     .GC_clear_stack_inner_end:");
 571       asm("     .size GC_clear_stack_inner,.GC_clear_stack_inner_end-GC_clear_stack_inner");
 572 #   endif
 573
 574 # ifdef LINT
 575     /*ARGSUSED*/
 576     ptr_t GC_clear_stack_inner(arg, limit)
 577     ptr_t arg; word limit;
 578     { return(arg); }
 579 # endif
 580 #endif