C:/Users/Dennis/src/lang/russell.orig/src/gc/mach_dep.c

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# include "gc_private.h"
# include <stdio.h>
# include <setjmp.h>
# ifdef OS2
#   define _setjmp(b) setjmp(b)
#   define _longjmp(b,v) longjmp(b,v)
# endif

/* Routine to mark from registers that are preserved by the C compiler. */
/* This must be ported to every new architecture.  There is a generic   */
/* version at the end, that is likely, but not guaranteed to work       */
/* on your architecture.  Run the test_setjmp program to see whether    */
/* there is any chance it will work.                                    */
GC_mark_regs()
{
#       ifdef RT
          register long TMP_SP; /* must be bound to r11 */
#       endif
#       ifdef VAX
        /* VAX - generic code below does not work under 4.2 */
          /* r1 through r5 are caller save, and therefore     */
          /* on the stack or dead.                            */
          asm("pushl r11");     asm("calls $1,_GC_tl_mark");
          asm("pushl r10");     asm("calls $1,_GC_tl_mark");
          asm("pushl r9");      asm("calls $1,_GC_tl_mark");
          asm("pushl r8");      asm("calls $1,_GC_tl_mark");
          asm("pushl r7");      asm("calls $1,_GC_tl_mark");
          asm("pushl r6");      asm("calls $1,_GC_tl_mark");
#       endif
#       if defined(M68K) && defined(SUNOS)
        /*  M68K SUNOS - could be replaced by generic code */
          /* a0, a1 and d1 are caller save          */
          /*  and therefore are on stack or dead.   */
        
          asm("subqw #0x4,sp");         /* allocate word on top of stack */

          asm("movl a2,sp@");   asm("jbsr _GC_tl_mark");
          asm("movl a3,sp@");   asm("jbsr _GC_tl_mark");
          asm("movl a4,sp@");   asm("jbsr _GC_tl_mark");
          asm("movl a5,sp@");   asm("jbsr _GC_tl_mark");
          /* Skip frame pointer and stack pointer */
          asm("movl d1,sp@");   asm("jbsr _GC_tl_mark");
          asm("movl d2,sp@");   asm("jbsr _GC_tl_mark");
          asm("movl d3,sp@");   asm("jbsr _GC_tl_mark");
          asm("movl d4,sp@");   asm("jbsr _GC_tl_mark");
          asm("movl d5,sp@");   asm("jbsr _GC_tl_mark");
          asm("movl d6,sp@");   asm("jbsr _GC_tl_mark");
          asm("movl d7,sp@");   asm("jbsr _GC_tl_mark");

          asm("addqw #0x4,sp");         /* put stack back where it was  */
#       endif

#       if defined(M68K) && defined(HP)
        /*  M68K HP - could be replaced by generic code */
          /* a0, a1 and d1 are caller save.  */
        
          asm("subq.w &0x4,%sp");       /* allocate word on top of stack */

          asm("mov.l %a2,(%sp)"); asm("jsr _GC_tl_mark");
          asm("mov.l %a3,(%sp)"); asm("jsr _GC_tl_mark");
          asm("mov.l %a4,(%sp)"); asm("jsr _GC_tl_mark");
          asm("mov.l %a5,(%sp)"); asm("jsr _GC_tl_mark");
          /* Skip frame pointer and stack pointer */
          asm("mov.l %d1,(%sp)"); asm("jsr _GC_tl_mark");
          asm("mov.l %d2,(%sp)"); asm("jsr _GC_tl_mark");
          asm("mov.l %d3,(%sp)"); asm("jsr _GC_tl_mark");
          asm("mov.l %d4,(%sp)"); asm("jsr _GC_tl_mark");
          asm("mov.l %d5,(%sp)"); asm("jsr _GC_tl_mark");
          asm("mov.l %d6,(%sp)"); asm("jsr _GC_tl_mark");
          asm("mov.l %d7,(%sp)"); asm("jsr _GC_tl_mark");

          asm("addq.w &0x4,%sp");       /* put stack back where it was  */
#       endif /* M68K HP */

#       if defined(I386) && !defined(OS2) && !defined(SUNOS5)
        /* I386 code, generic code does not appear to work */
        /* It does appear to work under OS2, and asms dont */
          asm("pushl %eax");  asm("call _GC_tl_mark"); asm("addl $4,%esp");
          asm("pushl %ecx");  asm("call _GC_tl_mark"); asm("addl $4,%esp");
          asm("pushl %edx");  asm("call _GC_tl_mark"); asm("addl $4,%esp");
          asm("pushl %esi");  asm("call _GC_tl_mark"); asm("addl $4,%esp");
          asm("pushl %edi");  asm("call _GC_tl_mark"); asm("addl $4,%esp");
          asm("pushl %ebx");  asm("call _GC_tl_mark"); asm("addl $4,%esp");
#       endif

#       if defined(I386) && defined(SUNOS5)
        /* I386 code, generic code does not appear to work */
        /* It does appear to work under OS2, and asms dont */
          asm("pushl %eax");  asm("call GC_tl_mark"); asm("addl $4,%esp");
          asm("pushl %ecx");  asm("call GC_tl_mark"); asm("addl $4,%esp");
          asm("pushl %edx");  asm("call GC_tl_mark"); asm("addl $4,%esp");
          asm("pushl %esi");  asm("call GC_tl_mark"); asm("addl $4,%esp");
          asm("pushl %edi");  asm("call GC_tl_mark"); asm("addl $4,%esp");
          asm("pushl %ebx");  asm("call GC_tl_mark"); asm("addl $4,%esp");
#       endif

#       ifdef NS32K
          asm ("movd r3, tos"); asm ("bsr ?_GC_tl_mark"); asm ("adjspb $-4");
          asm ("movd r4, tos"); asm ("bsr ?_GC_tl_mark"); asm ("adjspb $-4");
          asm ("movd r5, tos"); asm ("bsr ?_GC_tl_mark"); asm ("adjspb $-4");
          asm ("movd r6, tos"); asm ("bsr ?_GC_tl_mark"); asm ("adjspb $-4");
          asm ("movd r7, tos"); asm ("bsr ?_GC_tl_mark"); asm ("adjspb $-4");
#       endif

#       ifdef SPARC
          /* generic code will not work */
          GC_save_regs_in_stack();
#       endif

#       ifdef RT
            GC_tl_mark(TMP_SP);    /* GC_tl_mark from r11 */

            asm("cas r11, r6, r0"); GC_tl_mark(TMP_SP); /* r6 */
            asm("cas r11, r7, r0"); GC_tl_mark(TMP_SP); /* through */
            asm("cas r11, r8, r0"); GC_tl_mark(TMP_SP); /* r10 */
            asm("cas r11, r9, r0"); GC_tl_mark(TMP_SP);
            asm("cas r11, r10, r0"); GC_tl_mark(TMP_SP);

            asm("cas r11, r12, r0"); GC_tl_mark(TMP_SP); /* r12 */
            asm("cas r11, r13, r0"); GC_tl_mark(TMP_SP); /* through */
            asm("cas r11, r14, r0"); GC_tl_mark(TMP_SP); /* r15 */
            asm("cas r11, r15, r0"); GC_tl_mark(TMP_SP);
#       endif

#       if defined(M68K) && defined(SYSV)
        /*  Once again similar to SUN and HP, though setjmp appears to work.
                --Parag
         */
#        ifdef __GNUC__
          asm("subqw #0x4,%sp");        /* allocate word on top of stack */
  
          asm("movl %a2,%sp@"); asm("jbsr GC_tl_mark");
          asm("movl %a3,%sp@"); asm("jbsr GC_tl_mark");
          asm("movl %a4,%sp@"); asm("jbsr GC_tl_mark");
          asm("movl %a5,%sp@"); asm("jbsr GC_tl_mark");
          /* Skip frame pointer and stack pointer */
          asm("movl %d1,%sp@"); asm("jbsr GC_tl_mark");
          asm("movl %d2,%sp@"); asm("jbsr GC_tl_mark");
          asm("movl %d3,%sp@"); asm("jbsr GC_tl_mark");
          asm("movl %d4,%sp@"); asm("jbsr GC_tl_mark");
          asm("movl %d5,%sp@"); asm("jbsr GC_tl_mark");
          asm("movl %d6,%sp@"); asm("jbsr GC_tl_mark");
          asm("movl %d7,%sp@"); asm("jbsr GC_tl_mark");
  
          asm("addqw #0x4,%sp");        /* put stack back where it was  */
#        else /* !__GNUC__*/
          asm("subq.w &0x4,%sp");       /* allocate word on top of stack */
  
          asm("mov.l %a2,(%sp)"); asm("jsr GC_tl_mark");
          asm("mov.l %a3,(%sp)"); asm("jsr GC_tl_mark");
          asm("mov.l %a4,(%sp)"); asm("jsr GC_tl_mark");
          asm("mov.l %a5,(%sp)"); asm("jsr GC_tl_mark");
          /* Skip frame pointer and stack pointer */
          asm("mov.l %d1,(%sp)"); asm("jsr GC_tl_mark");
          asm("mov.l %d2,(%sp)"); asm("jsr GC_tl_mark");
          asm("mov.l %d3,(%sp)"); asm("jsr GC_tl_mark");
          asm("mov.l %d4,(%sp)"); asm("jsr GC_tl_mark");
          asm("mov.l %d5,(%sp)"); asm("jsr GC_tl_mark");
          asm("mov.l %d6,(%sp)"); asm("jsr GC_tl_mark");
          asm("mov.l %d7,(%sp)"); asm("jsr GC_tl_mark");
  
          asm("addq.w &0x4,%sp");       /* put stack back where it was  */
#        endif /* !__GNUC__ */
#       endif /* M68K/SYSV */


#     if defined(HP_PA) || (defined(I386) && defined(OS2))
        /* Generic code                          */
        /* The idea is due to Parag Patel at HP. */
        /* We're not sure whether he would like  */
        /* to be he acknowledged for it or not.  */
        {
            jmp_buf regs;
            register word * i = (word *) regs;
            register ptr_t lim = (ptr_t)(regs) + (sizeof regs);

            /* Setjmp on Sun 3s doesn't clear all of the buffer.  */
            /* That tends to preserve garbage.  Clear it.         */
                for (; (char *)i < lim; i++) {
                    *i = 0;
                }
            (void) _setjmp(regs);
            GC_mark_all_stack((ptr_t)regs, lim);
        }
#     endif

      /* other machines... */
#       if !(defined M68K) && !(defined VAX) && !(defined RT) 
#       if !(defined SPARC) && !(defined I386) &&!(defined NS32K)
#       if !defined(HP_PA)
            --> bad news <--
#       endif
#       endif
#       endif
}

/* On register window machines, we need a way to force registers into   */
/* the stack.                                                           */
# ifdef SPARC
#   ifdef SUNOS5
      asm("     .globl  GC_save_regs_in_stack");
      asm("GC_save_regs_in_stack:");
#   else
      asm("     .globl  _GC_save_regs_in_stack");
      asm("_GC_save_regs_in_stack:");
#   endif
    asm("       ta      0x3   ! ST_FLUSH_WINDOWS");
    asm("       mov     %sp,%o0");
    asm("       retl");
    asm("       nop");
# endif

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