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mmixlib.ch 64.2 KB
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% This is the change file that extracts from mmix-sim.w 
% the various .c files that make up the mmix library
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Types and preprocessor macros go into libtype.h

@x
@* Basics. To get started, we define a type that provides semantic sugar.
@y
@ @(libtype.h@>=
@h
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#define _LIBTYPE_H_
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@<Preprocessor macros@>@;
@<Type declarations@>@;

@* Basics. To get started, we define a type that provides semantic sugar.
@z

@x
@ @<Sub...@>=
void print_hex @,@,@[ARGS((octa))@];@+@t}\6{@>
@y
@ @(libprint.c@>=
#include <stdio.h>
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#include <setjmp.h>
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#include "libconfig.h"
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#include <time.h>
#include "libtype.h"
#include "libglobals.h"
#include "mmixlib.h"
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#include "libarith.h"
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#include "libimport.h"
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void print_hex @,@,@[ARGS((octa))@];@+@t}\6{@>
@z


The external definitions of mmix-arith
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should also go into a header file.
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@x
@<Sub...@>=
extern octa zero_octa; /* |zero_octa.h=zero_octa.l=0| */
@y
@(libarith.h@>=
extern octa zero_octa; /* |zero_octa.h=zero_octa.l=0| */
@z

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Fatal errors need to be handled but error messages moves to libconfig.h
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@x
@d panic(m) {@+fprintf(stderr,"Panic: %s!\n",m);@+exit(-2);@+}
@y
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@d panic(m) {@+MMIX_ERROR("Panic: %s!\n",m);@+longjmp(mmix_exit,-2);@+}
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@z

@x
@<Sub...@>=
void print_int @,@,@[ARGS((octa))@];@+@t}\6{@>
@y
@(libprint.c@>=
void print_int @,@,@[ARGS((octa))@];@+@t}\6{@>
@z

The tet field of the mem_tetra may be eliminated.

@x
  tetra tet; /* the tetrabyte of simulated memory */
@y
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#ifdef MMIX_MEM_TET
  tetra tet; /* the tetrabyte of simulated memory */
#endif
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@z

@x
@<Sub...@>=
mem_node* new_mem @,@,@[ARGS((void))@];@+@t}\6{@>
@y
@(libmem.c@>=
#include <stdlib.h>
#include <stdio.h>
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#include <setjmp.h>
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#include "libconfig.h"
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#include <time.h>
#include "libtype.h"
#include "libglobals.h"
#include "mmixlib.h"
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#include "libimport.h"
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mem_node* new_mem @,@,@[ARGS((void))@];@+@t}\6{@>
@z

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We distinguish between different levels of initialization:
persistent data (initialized once when we load the library),
then data that needs to be initialized each time we start the
simulator, 
and finally data that is initialized each time we boot the machine.

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@x
@<Initialize...@>=
mem_root=new_mem();
mem_root->loc.h=0x40000000;
last_mem=mem_root;
@y
@<Set up persistent data@>=
mem_root=new_mem();
mem_root->loc.h=0x40000000;
last_mem=mem_root;
@z

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Handling the simulation of memory goes into its own file.

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@x
@<Sub...@>=
mem_tetra* mem_find @,@,@[ARGS((octa))@];@+@t}\6{@>
@y
@(libmem.c@>=
mem_tetra* mem_find @,@,@[ARGS((octa))@];@+@t}\6{@>
@z

Defining the macro mm conflicts with other macros when using MS Visual C

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@d mm 0x98 /* the escape code of \.{mmo} format */
@y
@d mmo_esc 0x98 /* the escape code of \.{mmo} format */
@z

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Loading the object file will go into its own file. 

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@x
@<Initialize everything@>=
mmo_file=fopen(mmo_file_name,"rb");
@y
@<Load object file@>=
mmo_file=fopen(mmo_file_name,"rb");
@z

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How to print errors is defined in libconfig.h and
exit needs to be replaced by a longjmp.
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@x
    fprintf(stderr,"Can't open the object file %s or %s!\n",
@.Can't open...@>
               mmo_file_name,alt_name);
    exit(-3);
@y
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   MMIX_ERROR("Can't open the object file %s!\n",mmo_file_name);
   longjmp(mmix_exit,-3);
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@z


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these global varaibles go into libload

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@ @<Glob...@>=
FILE *mmo_file; /* the input file */
int postamble; /* have we encountered |lop_post|? */
int byte_count; /* index of the next-to-be-read byte */
byte buf[4]; /* the most recently read bytes */
int yzbytes; /* the two least significant bytes */
int delta; /* difference for relative fixup */
tetra tet; /* |buf| bytes packed big-endianwise */
@y
@ @<Load globals@>=
static FILE *mmo_file; /* the input file */
static int postamble; /* have we encountered |lop_post|? */
static int byte_count; /* index of the next-to-be-read byte */
static byte buf[4]; /* the most recently read bytes */
static int yzbytes; /* the two least significant bytes */
static int delta; /* difference for relative fixup */
static tetra tet; /* |buf| bytes packed big-endianwise */@z
@z

MMIX_ERROR again.

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@x
     fprintf(stderr,"Bad object file! (Try running MMOtype.)\n");
@.Bad object file@>
     exit(-4);
@y   
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     MMIX_ERROR("%s","Bad object file! (Try running MMOtype.)\n");
     longjmp(mmix_exit,-4);
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@z

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The next function goes into libload.

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@x
@<Sub...@>=
void read_tet @,@,@[ARGS((void))@];@+@t}\6{@>
@y
@(libload.c@>=
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
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#include <setjmp.h>
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#include "libconfig.h"
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#include <time.h>
#include "libtype.h"
#include "libglobals.h"
#include "mmixlib.h"
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#include "libarith.h"
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#include "libname.h"
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#include "libimport.h"
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@<Load globals@>
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@<Loading subroutines@>@;

@ @<Loading subroutines@>=
void read_tet @,@,@[ARGS((void))@];@+@t}\6{@>
@z

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Also to libload.

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@x
@ @<Sub...@>=
byte read_byte @,@,@[ARGS((void))@];@+@t}\6{@>
@y
@ @<Loading subroutines@>=
byte read_byte @,@,@[ARGS((void))@];@+@t}\6{@>
@z

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Replace mm by mmo_esc.

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@x
if (buf[0]!=mm || buf[1]!=lop_pre) mmo_err;
@y
if (buf[0]!=mmo_esc || buf[1]!=lop_pre) mmo_err;
@z

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And again.

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@x
 loop:@+if (buf[0]==mm) switch (buf[1]) {
@y
 loop:@+if (buf[0]==mmo_esc) switch (buf[1]) {
@z

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The macro mmo_load becomes a function,
which uses MMIX_LDT and MMIX_STT as defined in libconfig.h.

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@x
@d mmo_load(loc,val) ll=mem_find(loc), ll->tet^=val
@y
@d mmo_load(loc,val) ll=load_mem_tetra(loc,val)

@(libload.c@>=
static mem_tetra *load_mem_tetra(octa loc, tetra val)  
{ octa x; 
  mem_tetra *ll=mem_find(loc);           
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  MMIX_LDT(x,loc);     
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  x.l = x.l^val;             
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  if (!MMIX_STT(x,loc))  
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  panic("Unable to store mmo file to RAM");
  return ll;
}

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@ This function is used next.
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@z

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Before we increment the line number,
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we reset the frequency and possibly record file, line, and loc.
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@x
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    ll->file_no=cur_file;
    ll->line_no=cur_line;
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    cur_line++;
@y
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#ifdef MMIX_LOAD_LINE_LOC
    MMIX_LOAD_LINE_LOC(cur_file,cur_line,cur_loc);
#else
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    ll->file_no=cur_file;
    ll->line_no=cur_line;
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#endif
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    ll->freq=0;
    cur_line++;
@z

The next lines of code complete loading the object file.

@x
@ @<Initialize...@>=
cur_loc.h=cur_loc.l=0;
@y
@ @<Load object file@>=
cur_loc.h=cur_loc.l=0;
@z

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mmo files use local file numbers.
As we might load multiple files,
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we have to map the file number stored in
the mmo file as the ybyte to the 
filenumbers used inside the library.
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Default conversion functions are defined
in libname.c.
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First the case of known files.

@x
case lop_file:@+if (file_info[ybyte].name) {
   if (zbyte) mmo_err;
   cur_file=ybyte;
@y
case lop_file:
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   if (ybyte2file[ybyte]>=0) {
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   if (zbyte) mmo_err;
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   cur_file=ybyte2file[ybyte];
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@z

Now we handle new files.

@x
 }@+else {
   if (!zbyte) mmo_err;
   file_info[ybyte].name=(char*)calloc(4*zbyte+1,1);
   if (!file_info[ybyte].name) {
     fprintf(stderr,"No room to store the file name!\n");@+exit(-5);
@.No room...@>
   }
   cur_file=ybyte;
   for (j=zbyte,p=file_info[ybyte].name; j>0; j--,p+=4) {
     read_tet();
     *p=buf[0];@+*(p+1)=buf[1];@+*(p+2)=buf[2];@+*(p+3)=buf[3];
   }
 }
@y
 }@+else {
   if (!zbyte) mmo_err;
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   if (4*zbyte+1>FILENAME_MAX) mmo_err;
   for (j=zbyte,p=filename; j>0; j--,p+=4) {
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     read_tet();
     *p=buf[0];@+*(p+1)=buf[1];@+*(p+2)=buf[2];@+*(p+3)=buf[3];
   }
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   cur_file=filename2file(filename);
   ybyte2file[ybyte]=cur_file;
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 }
@z

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mm was replaced by mmo_esc.
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@x
   if (buf[0]==mm) {
@y
   if (buf[0]==mmo_esc) {
@z

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We load the postamble into the beginning
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of segment~3, also known as \.{Stack\_Segment}).
The stack segment is set up to be used with an unsave instruction.
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On the stack, we have, the local registers (argc and argv) and the 
value of rL, then the global 
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registers and the special registers rB, rD, rE, rH, rJ, rM, rR, rP, rW, rX, rY, and rZ,
followed by rG and rA packed into eight byte.

@x
@<Load the postamble@>=
aux.h=0x60000000;@+ aux.l=0x18;
ll=mem_find(aux);
(ll-1)->tet=2; /* this will ultimately set |rL=2| */
(ll-5)->tet=argc; /* and $\$0=|argc|$ */
(ll-4)->tet=0x40000000;
(ll-3)->tet=0x8; /* and $\$1=\.{Pool\_Segment}+8$ */
G=zbyte;@+ L=0;@+ O=0;
for (j=G+G;j<256+256;j++,ll++,aux.l+=4) read_tet(), ll->tet=tet;
inst_ptr.h=(ll-2)->tet, inst_ptr.l=(ll-1)->tet; /* \.{Main} */
(ll+2*12)->tet=G<<24;
g[255]=incr(aux,12*8); /* we will \.{UNSAVE} from here, to get going */
@y
@<Load the postamble@>=
{ octa x;
  aux.h=0x60000000;
  x.h=0;@+x.l=0;@+aux.l=0x00;
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  if (!MMIX_STO(x,aux)) /* $\$0=|argc|$ */
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     panic("Unable to store mmo file to RAM");
  x.h=0x40000000;@+x.l=0x8;@+aux.l=0x08;
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  if (!MMIX_STO(x,aux)) /* and $\$1=\.{Pool\_Segment}+8$ */
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     panic("Unable to store mmo file to RAM");
  x.h=0;@+x.l=2;@+aux.l=0x10;
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  if (!MMIX_STO(x,aux)) /* this will ultimately set |rL=2| */
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     panic("Unable to store mmo file to RAM");
  G=zbyte;@+ L=0;@+ O=0;
  aux.l=0x18;
  for (j=G;j<256;j++,aux.l+=8) 
  { read_tet(); x.h=tet;
    read_tet(), x.l=tet;
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    if (!MMIX_STO(x,aux))
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       panic("Unable to store mmo file to RAM");
  }
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  aux=incr(aux,12*8); /* we can |UNSAVE| from here, to get going */
#ifdef MMIX_BOOT
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  loc.h=0x80000000; loc.l=0;
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  g[rWW] = x;  /* last octa stored is address of \.{Main} */
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  g[rBB] = aux;
  g[rXX].h = 0; g[rXX].l = ((tetra)UNSAVE<<24)+255; /* \.{UNSAVE} \$255 */
  rzz = 1;
#else
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  loc.h=0x80000000; loc.l=0;
  inst_ptr = x;  /* last octa stored is address of \.{Main} */
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  g[255] = aux;
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  g[rXX].h = 0; g[rXX].l = ((tetra)UNSAVE<<24)+255; /* \.{UNSAVE} \$255 */
  rzz = 1;
  trace_once=interacting;
/*  RESUME 0 will not work for x = 0
    inst_ptr = x;
    g[255] = aux;
    rzz = 0;  pretend \.{RESUME} 0 */
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#endif
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//  if (interacting) set_break(x,exec_bit);
  x.h=G<<24; x.l=0 /* rA */; 
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  if (!MMIX_STO(x,aux))
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     panic("Unable to store mmo file to RAM");
  G=g[rG].l; /* restore G to rG because it was changed above */
}
@z

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The source line buffer is allocated once.
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@x
@<Initialize...@>=
if (buf_size<72) buf_size=72;
@y
@<Set up persistent data@>=
if (buf_size<72) buf_size=72;
@z

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The display of source lines gets its own file.

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@x
@<Sub...@>=
void make_map @,@,@[ARGS((void))@];@+@t}\6{@>
@y
@(libshowline.c@>=
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
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#include <setjmp.h>
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#include "libconfig.h"
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#include <time.h>
#include "libtype.h"
#include "libglobals.h"
#include "mmixlib.h"
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#include "libimport.h"
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void make_map @,@,@[ARGS((void))@];@+@t}\6{@>
@z

these include files are needed only in libshowline.c

@x
@<Preprocessor macros@>=
@y
@<Showline macros@>=
@z

@x
@<Sub...@>=
void print_line @,@,@[ARGS((int))@];@+@t}\6{@>
void print_line(k)
  int k;
@y
@(libshowline.c@>=
void print_line(int k)
@z


@x
@ @<Preprocessor macros@>=
@y
@ @<Showline macros@>=
@z

@x
@<Sub...@>=
void show_line @,@,@[ARGS((void))@];@+@t}\6{@>
@y
@(libshowline.c@>=
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void show_line @,@,@[ARGS((void))@];@+@t}\6{@>
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@z

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Printing the profile has its own file.

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@x
@<Sub...@>=
void print_freqs @,@,@[ARGS((mem_node*))@];@+@t}\6{@>
@y
@(libprofile.c@>=
#include <stdio.h>
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#include <setjmp.h>
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#include "libconfig.h"
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#include <time.h>
#include "libtype.h"
#include "libglobals.h"
#include "mmixlib.h"
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#include "libarith.h"
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#include "libimport.h"
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void print_freqs @,@,@[ARGS((mem_node*))@];@+@t}\6{@>
@z

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@x
  octa cur_loc;
@y
  octa cur_loc;
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  MMIX_LOCAL_LL
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@z

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we use MMIX_FETCH.

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@x
 loc_implied: printf("%10d. %08x%08x: %08x (%s)\n",
      p->dat[j].freq, cur_loc.h, cur_loc.l, p->dat[j].tet,
      info[p->dat[j].tet>>24].name);
@y
 loc_implied:
 { tetra inst; 
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   MMIX_FETCH(inst,cur_loc);
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   printf("%10d. %08x%08x: %08x (%s)\n",
      p->dat[j].freq, cur_loc.h, cur_loc.l, inst,
      info[inst>>24].name);
 }
@z

For the mmixlib, we split performing the
instruction in three parts: 
resuming,fetching, and executing.
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here we do only the resuming.
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@x
@<Perform one instruction@>=
{
  if (resuming) loc=incr(inst_ptr,-4), inst=g[rX].l;
  else @<Fetch the next instruction@>;
@y
@<Perform one instruction@>=
{
  if (resuming)
  { loc=incr(inst_ptr,-4), inst=g[rzz?rXX:rX].l;
    if (rzz==0) /* RESUME 0 */
    { if ((loc.h&sign_bit) != (inst_ptr.h&sign_bit))
      { resuming = false;
        goto protection_violation;
      }
      @<Check for security violation@>
    }
  }
@z

This restriction is no longer necessary.

@x
  if (loc.h>=0x20000000) goto privileged_inst;
@y
@z

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The next two lines are not a propper part of
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performing an instruction and move to a separate 
function respectively to the main loop.
@x
  @<Trace the current instruction, if requested@>;
  if (resuming && op!=RESUME) resuming=false;
@y
@z

@x
int rop; /* ropcode of a resumed instruction */
@y
int rop; /* ropcode of a resumed instruction */
int rzz; /* Z field of a resumed instruction */
@z

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We turn |breakpoint| into an int to provide more information on the
kind of breakpoint. Instead of setting |breakpoint| to |true|, we 
(usually) store the respective bit of the |bkpt| field in the |mem_tetra| 
that caused the break. In case of a SWYM instruction, we set it to 
the YZ value shifted by 8 bit to the left. 
In all other cases, we set the |trace_bit|.

@x
bool breakpoint; /* should we pause after the current instruction? */
@y
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int breakpoint=0; /* what caused the pause after the current instruction? */
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@z


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@x
bool interacting; /* are we in interactive mode? */
@y
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bool interacting=false; /* are we in interactive mode? */
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bool show_operating_system = false; /* do we show negative addresses */
bool trace_once=false;
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octa rOlimit={-1,-1}; /* tracing and break only if g[rO]<=rOlimit */
bool interact_after_resume = false;
@z

We make some more variables global.

@x
@ @<Local...@>=
register mmix_opcode op; /* operation code of the current instruction */
register int xx,yy,zz,yz; /* operand fields of the current instruction */
register tetra f; /* properties of the current |op| */
@y
@ @<Glob...@>=
mmix_opcode op; /* operation code of the current instruction */
int xx,yy,zz,yz; /* operand fields of the current instruction */
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tetra f; /* properties of the current |op| */
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@ @<Local...@>=
@z

and p is no longer needed in performing an instruction.

@x
register char *p; /* current place in a string */
@y
@z

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loading the instruction is postponed
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@x
  inst=ll->tet;
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@y
@z

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When we hit an execute breakpoint, we set the exec bit in |breakpoint|.

@x
  if (ll->bkpt&exec_bit) breakpoint=true;
@y
  if (ll->bkpt&exec_bit) breakpoint|=exec_bit;
@z


647
648
now before incrementing the instruction pointer we load the instruction.
@x
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  inst_ptr=incr(inst_ptr,4);
@y
  @<Check for security violation@>
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  inst=0; /* default TRAP 0,Halt,0 */
  if(!MMIX_FETCH(inst,loc)) 
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    goto page_fault;
  inst_ptr=incr(inst_ptr,4);
  if ((inst_ptr.h&sign_bit) && !(loc.h&sign_bit))
    goto protection_violation;
@z

660
We change how to display certain instructions.
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@x
{"RESUME",0x00,0,0,5,"{%#b} -> %#z"},@|
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@y
{"RESUME",0x00,0,0,5,"{%#b}, $255 = %x, -> %#z"},@|
@z

@x
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{"SYNC",0x01,0,0,1,""},@|
{"SWYM",0x00,0,0,1,""},@|
@y
{"SYNC",0x01,0,0,1,"%z"},@|
{"SWYM",0x01,0,0,1,"%r"},@|
@z

676
L,G, and O are made global.
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@x
@ @<Local...@>=
register int G,L,O; /* accessible copies of key registers */
@y
@ @<Glob...@>=
int G=255,L=0,O=0; /* accessible copies of key registers */
@z

686

687
Some initialization needs to be done once others at each reboot.
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@x
@<Initialize...@>=
g[rK]=neg_one;
g[rN].h=(VERSION<<24)+(SUBVERSION<<16)+(SUBSUBVERSION<<8);
g[rN].l=ABSTIME; /* see comment and warning above */
g[rT].h=0x80000005;
g[rTT].h=0x80000006;
g[rV].h=0x369c2004;
if (lring_size<256) lring_size=256;
lring_mask=lring_size-1;
if (lring_size&lring_mask)
  panic("The number of local registers must be a power of 2");
@.The number of local...@>
l=(octa*)calloc(lring_size,sizeof(octa));
if (!l) panic("No room for the local registers");
@.No room...@>
cur_round=ROUND_NEAR;
@y
@<Set up persistent data@>=
if (lring_size<256) lring_size=256;
lring_mask=lring_size-1;
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if (lring_size&lring_mask) 
  panic("The number of local registers must be a power of 2");
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l=(octa*)calloc(lring_size,sizeof(octa));
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if (!l)  panic("No room for the local registers");
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@ @<Initialize...@>=
sclock.l=sclock.h=0;
profile_started=false;
halted=false;
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stdin_buf_start=stdin_buf_end=stdin_buf;
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good_guesses=bad_guesses=0;
profiling=false;
interrupt=false;

@ @<Boot the machine@>=
memset(l,0,lring_size*sizeof(octa));
memset(g,0,sizeof(g));
L=O=S=0;
G=g[rG].l=255;
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#ifdef MMIX_BOOT
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g[rK] = zero_octa;
#else
g[rK] = neg_one;
#endif
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g[rN].h=(VERSION<<24)+(SUBVERSION<<16)+(SUBSUBVERSION<<8);
g[rN].l=ABSTIME; /* see comment and warning above */
g[rT].h=0x80000000;g[rT].l=0x00000000;
g[rTT].h=0x80000000;g[rTT].l=0x00000000;
g[rV].h=0x12340D00;
g[rV].l=0x00002000;
cur_round=ROUND_NEAR;
@z

@x
  if (((S-O-L)&lring_mask)==0) stack_store();
@y
  if (((S-O-L)&lring_mask)==0) stack_store(l[S&lring_mask]);
@z

@x
@d test_store_bkpt(ll) if ((ll)->bkpt&write_bit) breakpoint=tracing=true
@y
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752
@d test_store_bkpt(ll) if ((ll)->bkpt&write_bit) breakpoint|=write_bit,tracing=true
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@z


stack_store must implement the rC register.

@x
@<Sub...@>=
void stack_store @,@,@[ARGS((void))@];@+@t}\6{@>
void stack_store()
{
  register mem_tetra *ll=mem_find(g[rS]);
  register int k=S&lring_mask;
  ll->tet=l[k].h;@+test_store_bkpt(ll);
  (ll+1)->tet=l[k].l;@+test_store_bkpt(ll+1);
  if (stack_tracing) {
    tracing=true;
    if (cur_line) show_line();
    printf("             M8[#%08x%08x]=l[%d]=#%08x%08x, rS+=8\n",
              g[rS].h,g[rS].l,k,l[k].h,l[k].l);
  }
  g[rS]=incr(g[rS],8),  S++;
}
@y
@<Stack store@>=
void stack_store @,@,@[ARGS((octa))@];@+@t}\6{@>
void stack_store(x)
  octa x;
{ unsigned int pw_bit, new_pw_bit;
  mem_tetra *ll;
  pw_bit=g[rQ].h&PW_BIT;
  new_pw_bit=new_Q.h&PW_BIT;
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  if(!MMIX_STO(x,g[rS])) /* implementing the rC register */
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  {   /* set CP_BIT */
      g[rQ].l |= CP_BIT;
      new_Q.l |= CP_BIT;
      if (g[rC].l&0x02)  /* Write bit */
      {  int s;
         octa address, base, offset,mask;
         mask.h=mask.l=0xFFFFFFFF;
         g[rQ].h &=~PW_BIT;  /* restore PW_BIT */
         new_Q.h &=~PW_BIT;
         g[rQ].h |= pw_bit;
         new_Q.h |= new_pw_bit;
         s    = (g[rV].h>>8)&0xFF;  /* extract the page size from rV */
         mask = shift_left(mask,s);
         offset.h = g[rS].h&~mask.h,offset.l = g[rS].l&~mask.l;
         mask.h &= 0x0000FFFF;     /* reduce mask to 48 bits */
         base.h = g[rC].h&mask.h,base.l = g[rC].l&mask.l;
         address.h=base.h|offset.h,address.l=base.l|offset.l;
802
         MMIX_STO(x,address);
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      }
  }
  ll=mem_find(g[rS]);
  test_store_bkpt(ll);
  test_store_bkpt(ll+1);
808
  mmix_stack_trace("             M8[#%08x%08x]=#%08x%08x, rS+=8\n",
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              g[rS].h,g[rS].l,x.h,x.l);
  g[rS]=incr(g[rS],8),  S++;
}

@ @<Sub...@>=
@<Stack store@>@;
@z

@x
@d test_load_bkpt(ll) if ((ll)->bkpt&read_bit) breakpoint=tracing=true
@y
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Martin Ruckert committed
820
@d test_load_bkpt(ll) if ((ll)->bkpt&read_bit) breakpoint|=read_bit,tracing=true
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@z

Same with stack load.
@x
@<Sub...@>=
void stack_load @,@,@[ARGS((void))@];@+@t}\6{@>
@y
@<Sub...@>=
@<Stack load@>@;

@ @<Stack load@>=
void stack_load @,@,@[ARGS((void))@];@+@t}\6{@>
@z

@x
  l[k].h=ll->tet;@+test_load_bkpt(ll);
  l[k].l=(ll+1)->tet;@+test_load_bkpt(ll+1);
@y
  test_load_bkpt(ll);@+test_load_bkpt(ll+1);
840
  MMIX_LDO(l[k],g[rS]);
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842
@z

843
844
showing lines is part of main.

845
@x
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  if (stack_tracing) {
    tracing=true;
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    if (cur_line) show_line();
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850
851
    printf("             rS-=8, l[%d]=M8[#%08x%08x]=#%08x%08x\n",
              k,g[rS].h,g[rS].l,l[k].h,l[k].l);
  }
852
@y
853
854
  mmix_stack_trace("             rS-=8, l[%d]=M8[#%08x%08x]=#%08x%08x\n",
              k,g[rS].h,g[rS].l,l[k].h,l[k].l);
855
856
@z

857

858
859
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861
862
863
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865
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867
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@x
@<Sub...@>=
int register_truth @,@,@[ARGS((octa,mmix_opcode))@];@+@t}\6{@>
@y
@<Sub...@>=
@<Register truth@>@;

@ @<Register truth@>=
int register_truth @,@,@[ARGS((octa,mmix_opcode))@];@+@t}\6{@>
@z

869
Make sure we do not branch from a positive to a negative address.
870
871
872
873
874
875
876
877
@x
   inst_ptr=z;
@y
   if ((z.h&sign_bit) && !(loc.h&sign_bit))
   goto protection_violation;
   inst_ptr=z;
@z

878
879
880
881
882
883
884
@x
   if (g[rI].l<=2 && g[rI].l && g[rI].h==0) tracing=breakpoint=true;
@y
   if (g[rI].l<=2 && g[rI].l && g[rI].h==0) g[rQ].l |= IN_BIT, new_Q.l |= IN_BIT, tracing=true, breakpoint|=trace_bit;
@z


885
Loading is supposed to use the functions from libconfig
886
887

@x
888
889
890
891
892
893
894
case LDB: case LDBI: case LDBU: case LDBUI:@/
 i=56;@+j=(w.l&0x3)<<3; goto fin_ld;
case LDW: case LDWI: case LDWU: case LDWUI:@/
 i=48;@+j=(w.l&0x2)<<3; goto fin_ld;
case LDT: case LDTI: case LDTU: case LDTUI:@/
 i=32;@+j=0;@+ goto fin_ld;
case LDHT: case LDHTI: i=j=0;
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896
897
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899
fin_ld: ll=mem_find(w);@+test_load_bkpt(ll);
 x.h=ll->tet;
 x=shift_right(shift_left(x,j),i,op&0x2);
check_ld:@+if (w.h&sign_bit) goto privileged_inst; 
@y
900
case LDB: case LDBI: case LDBU: case LDBUI:@/
901
 i=56;@+j=56;@+if(!MMIX_LDB(x,w)) goto page_fault; goto fin_ld;
902
case LDW: case LDWI: case LDWU: case LDWUI:@/
903
 i=48;@+j=48;@+if(!MMIX_LDW(x,w)) goto page_fault; goto fin_ld;
904
case LDT: case LDTI: case LDTU: case LDTUI:@/
905
906
 i=32;@+j=32;@+if(!MMIX_LDT(x,w)) goto page_fault; goto fin_ld;
case LDHT: case LDHTI: i=j=0;@+if(!MMIX_LDT(x,w)) goto page_fault;
907
x.h=x.l;x.l=0;
908
fin_ld: ll=mem_find(w);@+test_load_bkpt(ll);
909
 if (op&0x2) x=shift_right(shift_left(x,i),i,op&0x2);
910
911
912
913
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check_ld:@+ if ((w.h&sign_bit) && !(loc.h&sign_bit)) goto translation_bypassed_inst;
 goto store_x;
page_fault:
 if ((g[rK].h & g[rQ].h) != 0 || (g[rK].l & g[rQ].l) != 0) 
 { x.h=0, x.l=inst;
   y = w;
   z = zero_octa;
   @<Initiate a trap interrupt@>
   inst_ptr=y=g[rTT];
 }
 break;
@z

@x
case LDO: case LDOI: case LDOU: case LDOUI: case LDUNC: case LDUNCI:
 w.l&=-8;@+ ll=mem_find(w);
 test_load_bkpt(ll);@+test_load_bkpt(ll+1);
 x.h=ll->tet;@+ x.l=(ll+1)->tet;
 goto check_ld;
case LDSF: case LDSFI: ll=mem_find(w);@+test_load_bkpt(ll);
 x=load_sf(ll->tet);@+ goto check_ld;
@y
case LDO: case LDOI: case LDOU: case LDOUI: 
 w.l&=-8;@+ ll=mem_find(w);
 test_load_bkpt(ll);@+test_load_bkpt(ll+1);
935
 if (!MMIX_LDO(x,w)) goto page_fault;
936
937
938
939
 goto check_ld;
case LDUNC: case LDUNCI:
 w.l&=-8;@+ ll=mem_find(w);
 test_load_bkpt(ll);@+test_load_bkpt(ll+1);
940
 if (!MMIX_LDO_UNCACHED(x,w)) goto page_fault;
941
942
 goto check_ld;
case LDSF: case LDSFI: ll=mem_find(w);@+test_load_bkpt(ll);
943
 if (!MMIX_LDT(x,w)) goto page_fault;
944
945
946
 x=load_sf(x.l);@+ goto check_ld;
@z

947
Same for storing.
948
949
950
951

@x
case STB: case STBI: case STBU: case STBUI:@/
 i=56;@+j=(w.l&0x3)<<3; goto fin_pst;
952
953
954
955
956
957
958
@y
case STB: case STBI: case STBU: case STBUI:@/
 if ((op&0x2)==0) {
   a=shift_right(shift_left(b,56),56,0);
   if (a.h!=b.h || a.l!=b.l) exc|=V_BIT;
 }
 if ((w.h&sign_bit) && !(loc.h&sign_bit)) goto translation_bypassed_inst;
959
 if (!MMIX_STB(b,w)) goto page_fault;
960
 goto fin_st;
961
962
963
@z

@x
964
965
case STW: case STWI: case STWU: case STWUI:@/
 i=48;@+j=(w.l&0x2)<<3; goto fin_pst;
966
967
968
969
970
971
972
@y
case STW: case STWI: case STWU: case STWUI:@/
 if ((op&0x2)==0) {
   a=shift_right(shift_left(b,48),48,0);
   if (a.h!=b.h || a.l!=b.l) exc|=V_BIT;
 }
 if ((w.h&sign_bit) && !(loc.h&sign_bit)) goto translation_bypassed_inst;
973
 if (!MMIX_STW(b,w)) goto page_fault;
974
 goto fin_st;
975
976
977
@z

@x
978
979
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983
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986
case STT: case STTI: case STTU: case STTUI:@/
 i=32;@+j=0;
fin_pst: ll=mem_find(w);
 if ((op&0x2)==0) {
   a=shift_right(shift_left(b,i),i,0);
   if (a.h!=b.h || a.l!=b.l) exc|=V_BIT;
 }
 ll->tet^=(ll->tet^(b.l<<(i-32-j))) & ((((tetra)-1)<<(i-32))>>j);
 goto fin_st;
987
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@y
case STT: case STTI: case STTU: case STTUI:@/
 if ((op&0x2)==0) {
   a=shift_right(shift_left(b,32),32,0);
   if (a.h!=b.h || a.l!=b.l) exc|=V_BIT;
 }
fin_pst:
 if ((w.h&sign_bit) && !(loc.h&sign_bit)) goto translation_bypassed_inst;
995
 if (!MMIX_STT(b,w)) goto page_fault;
996
fin_st:
997
 ll=mem_find(w); test_store_bkpt(ll);
998
#ifdef MMIX_MEM_TET
999
1000
 w.l&=-8;@+ll=mem_find(w);
 a.h=ll->tet;@+ a.l=(ll+1)->tet; /* for trace output */
1001
#endif
1002
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 break;
@z


@x
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1009
case STSF: case STSFI: ll=mem_find(w);
 ll->tet=store_sf(b);@+exc=exceptions;
 goto fin_st;
1010
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1013
1014
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1016
1017
@y
case STSF: case STSFI: 
 a.l=b.l= store_sf(b);@+exc=exceptions;
 a.h=b.h=0;
 goto fin_pst;
@z

@x
1018
1019
1020
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1022
case STHT: case STHTI: ll=mem_find(w);@+ ll->tet=b.h;
fin_st: test_store_bkpt(ll);
 w.l&=-8;@+ll=mem_find(w);
 a.h=ll->tet;@+ a.l=(ll+1)->tet; /* for trace output */
 goto check_st; 
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@y
case STHT: case STHTI: 
  a.l=b.l=b.h;
  b.h=a.h=0;
  goto fin_pst;
@z

@x
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case STCO: case STCOI: b.l=xx;
case STO: case STOI: case STOU: case STOUI: case STUNC: case STUNCI:
 w.l&=-8;@+ll=mem_find(w);
 test_store_bkpt(ll);@+ test_store_bkpt(ll+1);
 ll->tet=b.h;@+ (ll+1)->tet=b.l;
check_st:@+if (w.h&sign_bit) goto privileged_inst;
 break;
@y
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1041
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case STCO: case STCOI: b.l=xx;
case STO: case STOI: case STOU: case STOUI:
 w.l&=-8;
 if ((w.h&sign_bit) && !(loc.h&sign_bit)) goto translation_bypassed_inst;
1043
 if (!MMIX_STO(b,w)) goto page_fault;
1044
 ll=mem_find(w); test_store_bkpt(ll);test_store_bkpt(ll+1);
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1046
 break;
case STUNC: case STUNCI:
1047
 w.l&=-8;
1048
 if ((w.h&sign_bit) && !(loc.h&sign_bit)) goto translation_bypassed_inst;
1049
 if (!MMIX_STO_UNCACHED(b,w)) goto page_fault;
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 ll=mem_find(w); test_store_bkpt(ll);test_store_bkpt(ll+1);
 break;
@z

@x
case CSWAP: case CSWAPI: w.l&=-8;@+ll=mem_find(w);
 test_load_bkpt(ll);@+test_load_bkpt(ll+1);
 a=g[rP];
 if (ll->tet==a.h && (ll+1)->tet==a.l) {
   x.h=0, x.l=1;
   test_store_bkpt(ll);@+test_store_bkpt(ll+1);
   ll->tet=b.h, (ll+1)->tet=b.l;
   strcpy(rhs,"M8[%#w]=%#b");
 }@+else {
   b.h=ll->tet, b.l=(ll+1)->tet;
   g[rP]=b;
   strcpy(rhs,"rP=%#b");
 }
@y
case CSWAP: case CSWAPI: w.l&=-8;@+ll=mem_find(w);
 test_load_bkpt(ll);@+test_load_bkpt(ll+1);
 if ((w.h&sign_bit) && !(loc.h&sign_bit)) goto  translation_bypassed_inst;
1072
 if (!MMIX_LDO(a,w)) goto page_fault;
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1074
1075
 if (g[rP].h==a.h && g[rP].l==a.l) {
   x.h=0, x.l=1;
   test_store_bkpt(ll);@+test_store_bkpt(ll+1);
1076
   if (!MMIX_STO(b,w)) goto page_fault;
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1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
   strcpy(rhs,"M8[%#w]=%#b");
 }@+else {
   b=a;
   a = g[rP];
   g[rP]=b;
   x.h=0, x.l=0;
   strcpy(rhs,"rP=%#b");
 }
@z


@x
case GET:@+if (yy!=0 || zz>=32) goto illegal_inst;
  x=g[zz];
  goto store_x;
case PUT: case PUTI:@+ if (yy!=0 || xx>=32) goto illegal_inst;
  strcpy(rhs,"%z = %#z");
  if (xx>=8) {
    if (xx<=11 && xx!=8) goto illegal_inst; /* can't change rN, rO, rS */
    if (xx<=18) goto privileged_inst;
    if (xx==rA) @<Get ready to update rA@>@;
    else if (xx==rL) @<Set $L=z=\min(z,L)$@>@;
    else if (xx==rG) @<Get ready to update rG@>;
  }
  g[xx]=z;@+zz=xx;@+break;
@y
case GET:@+if (yy!=0 || zz>=32) goto illegal_inst;
  x=g[zz];
  if (zz==rQ) { 
      new_Q.h = new_Q.l = 0;
  }
  goto store_x;
case PUT: case PUTI:@+ if (yy!=0 || xx>=32) goto illegal_inst;
  strcpy(rhs,"%z = %#z");
  if (xx>=8) {
    if (xx==9) goto illegal_inst; /* can't change rN */
    if (xx<=18 && !(loc.h&sign_bit)) goto privileged_inst;
    if (xx==rA) @<Get ready to update rA@>@;
    else if (xx==rL) @<Set $L=z=\min(z,L)$@>@;
    else if (xx==rG) @<Get ready to update rG@>@;
    else if (xx==rQ)
    { new_Q.h |= z.h &~ g[rQ].h;@+
      new_Q.l |= z.l &~ g[rQ].l;
      z.l |= new_Q.l;@+
      z.h |= new_Q.h;@+
    }
  }
  g[xx]=z;@+zz=xx;@+break;
@z

@x
case PUSHGO: case PUSHGOI: inst_ptr=w;@+goto push;
case PUSHJ: case PUSHJB: inst_ptr=z;
push:@+if (xx>=G) {
   xx=L++;
   if (((S-O-L)&lring_mask)==0) stack_store();
 }
@y
case PUSHGO: case PUSHGOI: 
if ((w.h&sign_bit) && !(loc.h&sign_bit))
goto protection_violation;
inst_ptr=w;@+goto push;
case PUSHJ: case PUSHJB: 
if ((z.h&sign_bit) && !(loc.h&sign_bit))
goto protection_violation;  
inst_ptr=z;
push:@+if (xx>=G) {
   xx=L++;
   if (((S-O-L)&lring_mask)==0) stack_store(l[S&lring_mask]);
 }
@z

@x
 y=g[rJ];@+ z.l=yz<<2;@+ inst_ptr=oplus(y,z);
@y
 y=g[rJ];@+ z.l=yz<<2;
 { octa tmp;
   tmp=oplus(y,z);
   if ((tmp.h&sign_bit) && !(loc.h&sign_bit))
   goto protection_violation;  
   inst_ptr = tmp;
}
@z

@x
case SAVE:@+if (xx<G || yy!=0 || zz!=0) goto illegal_inst;
 l[(O+L)&lring_mask].l=L, L++;
 if (((S-O-L)&lring_mask)==0) stack_store();
@y
case SAVE:@+if (xx<G || yy!=0 || zz!=0) goto illegal_inst;
 l[(O+L)&lring_mask].l=L, L++;
 if (((S-O-L)&lring_mask)==0) stack_store(l[S&lring_mask]);
@z

@x
 while (g[rO].l!=g[rS].l) stack_store();
@y
 while (g[rO].l!=g[rS].l) stack_store(l[S&lring_mask]);
@z

@x
@<Store |g[k]| in the register stack...@>=
ll=mem_find(g[rS]);
if (k==rZ+1) x.h=G<<24, x.l=g[rA].l;
else x=g[k];
ll->tet=x.h;@+test_store_bkpt(ll);
(ll+1)->tet=x.l;@+test_store_bkpt(ll+1);
if (stack_tracing) {
  tracing=true;
  if (cur_line) show_line();
  if (k>=32) printf("             M8[#%08x%08x]=g[%d]=#%08x%08x, rS+=8\n",
            g[rS].h,g[rS].l,k,x.h,x.l);
  else printf("             M8[#%08x%08x]=%s=#%08x%08x, rS+=8\n",
            g[rS].h,g[rS].l,k==rZ+1? "(rG,rA)": special_name[k],x.h,x.l);
}
S++, g[rS]=incr(g[rS],8);
@y
@<Store |g[k]| in the register stack...@>=
if (k==rZ+1) x.h=G<<24, x.l=g[rA].l;
else x=g[k];
stack_store(x);
@z

@x
@ @<Load |g[k]| from the register stack@>=
g[rS]=incr(g[rS],-8);
ll=mem_find(g[rS]);
test_load_bkpt(ll);@+test_load_bkpt(ll+1);
if (k==rZ+1) {
  x.l=G=g[rG].l=ll->tet>>24, a.l=g[rA].l=(ll+1)->tet&0x3ffff;
  if (G<32) x.l=G=g[rG].l=32;
}@+else g[k].h=ll->tet, g[k].l=(ll+1)->tet;
if (stack_tracing) {
  tracing=true;
  if (cur_line) show_line();
  if (k>=32) printf("             rS-=8, g[%d]=M8[#%08x%08x]=#%08x%08x\n",
            k,g[rS].h,g[rS].l,ll->tet,(ll+1)->tet);
  else if (k==rZ+1) printf("             (rG,rA)=M8[#%08x%08x]=#%08x%08x\n",
            g[rS].h,g[rS].l,ll->tet,(ll+1)->tet);
  else printf("             rS-=8, %s=M8[#%08x%08x]=#%08x%08x\n",
            special_name[k],g[rS].h,g[rS].l,ll->tet,(ll+1)->tet);
}
@y
@ @<Load |g[k]| from the register stack@>=
g[rS]=incr(g[rS],-8);
ll=mem_find(g[rS]);
test_load_bkpt(ll);@+test_load_bkpt(ll+1);
1224
1225
if (k==rZ+1) { 
  if (!MMIX_LDO(a,g[rS])) { w=g[rS]; goto page_fault; }
1226
1227
1228
1229
  x.l=G=g[rG].l=a.h>>24;
  a.l=g[rA].l=a.l&0x3ffff;
}
else
1230
1231
  if (!MMIX_LDO(g[k],g[rS]))  { w=g[rS]; goto page_fault; }
if (k>=32) mmix_stack_trace("             rS-=8, g[%d]=M8[#%08x%08x]=#%08x%08x\n",
1232
1233
          k,g[rS].h,g[rS].l,g[k].h,g[k].l);
else if (k==rZ+1) mmix_stack_trace("             (rG,rA)=M8[#%08x%08x]=#%08x%08x\n",
1234
          g[rS].h,g[rS].l,a.h,a.l);
1235
1236
else mmix_stack_trace("             rS-=8, %s=M8[#%08x%08x]=#%08x%08x\n",
          special_name[k],g[rS].h,g[rS].l,g[k].h,g[k].l);
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
@z

@x
@ The cache maintenance instructions don't affect this simulation,
because there are no caches. But if the user has invoked them, we do
provide a bit of information when tracing, indicating the scope of the
instruction.

@<Cases for ind...@>=
case SYNCID: case SYNCIDI: case PREST: case PRESTI:
case SYNCD: case SYNCDI: case PREGO: case PREGOI:
case PRELD: case PRELDI: x=incr(w,xx);@+break;
@y
@ The cache maintenance instructions do affect this simulation.

@<Cases for ind...@>=
case SYNCID: case SYNCIDI:
1254
 MMIX_DELETE_ICACHE(w,xx+1);
1255
 if (loc.h&sign_bit)
1256
   MMIX_DELETE_DCACHE(w,xx+1);
1257
 else
1258
   MMIX_STORE_DCACHE(w,xx+1);
1259
1260
1261
 break;
case PREST: case PRESTI: x=incr(w,xx);@+break;
case SYNCD: case SYNCDI:  
1262
 MMIX_STORE_DCACHE(w,xx+1);
1263
 if (loc.h&sign_bit)
1264
   MMIX_DELETE_DCACHE(w,xx+1);
1265
1266
 break;
case PREGO: case PREGOI:
1267
 MMIX_PRELOAD_ICACHE(w,xx+1);
1268
1269
 break;
case PRELD: case PRELDI:
1270
 MMIX_PRELOAD_DCACHE(w,xx+1);
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
 x=incr(w,xx);@+break;
@z

@x
case GO: case GOI: x=inst_ptr;@+inst_ptr=w;@+goto store_x;
case JMP: case JMPB: inst_ptr=z;
case SWYM: break;
case SYNC:@+if (xx!=0 || yy!=0 || zz>7) goto illegal_inst;
 if (zz<=3) break;
case LDVTS: case LDVTSI: privileged_inst: strcpy(lhs,"!privileged");
 goto break_inst;
illegal_inst: strcpy(lhs,"!illegal");
break_inst: breakpoint=tracing=true;
 if (!interacting && !interact_after_break) halted=true;
 break;
@y
case GO: case GOI: 
   if ((w.h&sign_bit) && !(loc.h&sign_bit))
   goto protection_violation;  
   x=inst_ptr;@+inst_ptr=w;@+goto store_x;
case JMP: case JMPB: 
   if ((z.h&sign_bit) && !(loc.h&sign_bit))
   goto protection_violation;  
   inst_ptr=z;@+break;
case SYNC:@+if (xx!=0 || yy!=0 || zz>7) goto illegal_inst;
/* should give a privileged instruction interrupt in case zz  >3 */
 else if (zz==4) /* power save mode */
 {  const unsigned int cycle_speed = 1000000; /* cycles per ms */
    const unsigned int max_wait = 100;
    int d, ms;
    if (g[rI].h!=0 || g[rI].l>max_wait*cycle_speed) /* large rI values */
      ms = max_wait;
    else
      ms = g[rI].l/cycle_speed;
    if (ms>0)
    {  MMIX_DELAY(ms,d); 
       g[rI]=incr(g[rI],-(ms-d)*cycle_speed);
     }
     else if (g[rI].l>1000)
        g[rI].l = g[rI].l-1000;
     else if (g[rI].l>100)
        g[rI].l = g[rI].l-100;
     else if (g[rI].l>10)
        g[rI].l = g[rI].l-10;
 }
 else if (zz==5) /* empty write buffer */
1317
   MMIX_WRITE_DCACHE();
1318
 else if (zz==6) /* clear VAT cache */
1319
1320
 {  MMIX_CLEAR_DVTC();
    MMIX_CLEAR_IVTC();
1321
1322
 }
 else if (zz==7) /* clear instruction and data cache */
1323
1324
 { MMIX_CLEAR_DCACHE();
   MMIX_CLEAR_ICACHE();
1325
1326
1327
1328
1329
 }
 break;
case LDVTS: case LDVTSI:   
{ if (!(loc.h&sign_bit)) goto privileged_inst;
  if (w.h&sign_bit) goto illegal_inst;
1330
  x = MMIX_UPDATE_VTC(w);
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
  goto store_x;
}
break;
case SWYM:
 if ((inst&0xFFFFFF)!=0) 
 {   char buf[256+1];
     int n;
     strcpy(rhs,"$%x,%z");
     z.h=0, z.l=yz;
     x.h=0, x.l=xx;
     tracing=interacting;
1342
     breakpoint=(breakpoint&0xFF) | (yz<<8);
1343
1344
1345
1346
1347
     interrupt=false;
     @<Set |b| from register X@>;
     n=mmgetchars((unsigned char *)buf,256,b,0);
     buf[n]=0;
     if (n>6 && strncmp(buf,"DEBUG ",6)==0) 
1348
     { printf("\n%s!\n",buf+6);
1349
1350
1351
1352
1353
1354
1355
       sprintf(rhs,"rF=#%08X%08X\n",g[rF].h, g[rF].l);
       tracing= true;
     }
 }
 else
   strcpy(rhs,"");
break;
1356
translation_bypassed_inst: strcpy(lhs,"!negative address in load/store");
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
g[rQ].h |= N_BIT; new_Q.h |= N_BIT; /* set the n bit */
 goto break_inst;
privileged_inst: strcpy(lhs,"!kernel only");
g[rQ].h |= K_BIT; new_Q.h |= K_BIT; /* set the k bit */
 goto break_inst;
illegal_inst: strcpy(lhs,"!broken");
g[rQ].h |= B_BIT; new_Q.h |= B_BIT; /* set the b bit */
 goto break_inst;
protection_violation: strcpy(lhs,"!protected");
g[rQ].h |= P_BIT; new_Q.h |= P_BIT; /* set the p bit */
 goto break_inst;
security_inst: strcpy(lhs,"!insecure");
1369
break_inst: tracing=true, breakpoint|=trace_bit;
1370
1371
1372
1373
1374
1375
1376
 if (!interacting && !interact_after_break) halted=true;
break;
@z

@x
case TRAP:@+if (xx!=0 || yy>max_sys_call) goto privileged_inst;
@y
1377
1378
1379
#ifndef MMIX_TRAP
case TRAP:@+if (xx!=0 || yy>max_sys_call) goto privileged_inst;
@z
1380

1381
1382
1383
1384
1385
@x
 x=g[255]=g[rBB];@+break;
@y
 x=g[255]=g[rBB];@+break;
#else
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
case TRAP:@+if (xx==0 && yy<=max_sys_call) 
      { strcpy(rhs,trap_format[yy]);
        a=incr(b,8);
        @<Prepare memory arguments $|ma|={\rm M}[a]$ and $|mb|={\rm M}[b]$ if needed@>;
      }
     else strcpy(rhs, "%#x -> %#y");
 if (tracing && !show_operating_system) interact_after_resume = true;    
 x.h=sign_bit, x.l=inst;
 @<Initiate a trap interrupt@>
 inst_ptr=y=g[rT];
 break;
1397
#endif
1398
1399
@z

1400
1401
1402
1403
1404
1405
This is the code for TRAP 0,Halt,0
@x
if (!zz) halted=breakpoint=true;
@y
if (!zz) halted=true, breakpoint|=trace_bit;
@z
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418

@x
"$255 = Fopen(%!z,M8[%#b]=%#q,M8[%#a]=%p) = %x",
"$255 = Fclose(%!z) = %x",
"$255 = Fread(%!z,M8[%#b]=%#q,M8[%#a]=%p) = %x",
"$255 = Fgets(%!z,M8[%#b]=%#q,M8[%#a]=%p) = %x",
"$255 = Fgetws(%!z,M8[%#b]=%#q,M8[%#a]=%p) = %x",
"$255 = Fwrite(%!z,M8[%#b]=%#q,M8[%#a]=%p) = %x",
"$255 = Fputs(%!z,%#b) = %x",
"$255 = Fputws(%!z,%#b) = %x",
"$255 = Fseek(%!z,%b) = %x",
"$255 = Ftell(%!z) = %x"};
@y
1419
#ifdef MMIX_TRAP
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
"$255 = Fopen(%!z,M8[%#b]=%#q,M8[%#a]=%p) -> %#y",
"$255 = Fclose(%!z) -> %#y",
"$255 = Fread(%!z,M8[%#b]=%#q,M8[%#a]=%p) -> %#y",
"$255 = Fgets(%!z,M8[%#b]=%#q,M8[%#a]=%p) -> %#y",
"$255 = Fgetws(%!z,M8[%#b]=%#q,M8[%#a]=%p) -> %#y",
"$255 = Fwrite(%!z,M8[%#b]=%#q,M8[%#a]=%p) -> %#y",
"$255 = Fputs(%!z,%#b) -> %#y",
"$255 = Fputws(%!z,%#b) -> %#y",
"$255 = Fseek(%!z,%b) -> %#y",
"$255 = Ftell(%!z) -> %#y"};
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
#else
"$255 = Fopen(%!z,M8[%#b]=%#q,M8[%#a]=%p) = %x",
"$255 = Fclose(%!z) = %x",
"$255 = Fread(%!z,M8[%#b]=%#q,M8[%#a]=%p) = %x",
"$255 = Fgets(%!z,M8[%#b]=%#q,M8[%#a]=%p) = %x",
"$255 = Fgetws(%!z,M8[%#b]=%#q,M8[%#a]=%p) = %x",
"$255 = Fwrite(%!z,M8[%#b]=%#q,M8[%#a]=%p) = %x",
"$255 = Fputs(%!z,%#b) = %x",
"$255 = Fputws(%!z,%#b) = %x",
"$255 = Fseek(%!z,%b) = %x",
"$255 = Ftell(%!z) = %x"};
#endif
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
@z



@x
@ @<Prepare memory arguments...@>=
if (arg_count[yy]==3) {
  ll=mem_find(b);@+test_load_bkpt(ll);@+test_load_bkpt(ll+1);
  mb.h=ll->tet, mb.l=(ll+1)->tet;
  ll=mem_find(a);@+test_load_bkpt(ll);@+test_load_bkpt(ll+1);
  ma.h=ll->tet, ma.l=(ll+1)->tet;
}
@y
@ @<Prepare memory arguments...@>=
if (arg_count[yy]==3) {
1457
1458
   MMIX_LDO(mb,b);
   MMIX_LDO(ma,a);
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
}
@z

@x
@ The input/output operations invoked by \.{TRAP}s are
done by subroutines in an auxiliary program module called {\mc MMIX-IO}.
Here we need only declare those subroutines, and write three primitive
interfaces on which they depend.

@ @<Glob...@>=
@y
1470
@ @(mmix-io.h@>=
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
@z

@x
@<Sub...@>=
int mmgetchars @,@,@[ARGS((char*,int,octa,int))@];@+@t}\6{@>
int mmgetchars(buf,size,addr,stop)
  char *buf;
  int size;
  octa addr;
  int stop;
{
  register char *p;
  register int m;
  register mem_tetra *ll;
  register tetra x;
  octa a;
  for (p=buf,m=0,a=addr; m<size;) {
    ll=mem_find(a);@+test_load_bkpt(ll);
    x=ll->tet;
    if ((a.l&0x3) || m>size-4) @<Read and store one byte; |return| if done@>@;
    else @<Read and store up to four bytes; |return| if done@>@;
  }
  return size;
}
@y
@(libmmget.c@>=
#include <stdio.h>
1498
#include <setjmp.h>
1499
#include "libconfig.h"
1500
1501
1502
1503
#include <time.h>
#include "libtype.h"
#include "libglobals.h"
#include "mmixlib.h"
1504
#include "libarith.h"
1505
#include "libimport.h"
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516

int mmgetchars(buf,size,addr,stop)
  unsigned char *buf;
  int size;
  octa addr;
  int stop;
{
  register unsigned char *p;
  register int m;
  octa x;
  octa a;
1517
  MMIX_LOCAL_LL
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
  for (p=buf,m=0,a=addr; m<size;) {
    if ((a.l&0x7) || m+8>size) @<Read and store one byte; |return| if done@>@;
    else @<Read and store eight bytes; |return| if done@>@;
  }
  return size;
}
@z

@x
@ @<Read and store one byte...@>=
{
  *p=(x>>(8*((~a.l)&0x3)))&0xff;
  if (!*p && stop>=0) {
    if (stop==0) return m;
    if ((a.l&0x1) && *(p-1)=='\0') return m-1;
  }
  p++,m++,a=incr(a,1);
}

@ @<Read and store up to four bytes...@>=
{
  *p=x>>24;
  if (!*p && (stop==0 || (stop>0 && x<0x10000))) return m;
  *(p+1)=(x>>16)&0xff;
  if (!*(p+1) && stop==0) return m+1;
  *(p+2)=(x>>8)&0xff;
  if (!*(p+2) && (stop==0 || (stop>0 && (x&0xffff)==0))) return m+2;
  *(p+3)=x&0xff;
  if (!*(p+3) && stop==0) return m+3;
  p+=4,m+=4,a=incr(a,4);
}
@y
@ @<Read and store one byte...@>=
1551
{ MMIX_LDB(x,a);
1552
1553
1554
1555
1556
1557
1558
1559
1560
    *p=x.l&0xff;
  if (!*p && stop>=0) {
    if (stop==0) return m;
    if ((a.l&0x1) && *(p-1)=='\0') return m-1;
  }
  p++,m++,a=incr(a,1);
}

@ @<Read and store eight bytes...@>=
1561
{ MMIX_LDO(x,a);
1562
1563
1564
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  *p=x.h>>24;
  if (!*p && (stop==0 || (stop>0 && x.h<0x10000))) return m;
  *(p+1)=(x.h>>16)&0xff;
  if (!*(p+1) && stop==0) return m+1;
  *(p+2)=(x.h>>8)&0xff;
  if (!*(p+2) && (stop==0 || (stop>0 && (x.h&0xffff)==0))) return m+2;
  *(p+3)=x.h&0xff;
  if (!*(p+3) && stop==0) return m+3;
  p+=4,m+=4,a=incr(a,4);
  *p=x.l>>24;
  if (!*p && (stop==0 || (stop>0 && x.l<0x10000))) return m;
  *(p+1)=(x.l>>16)&0xff;
  if (!*(p+1) && stop==0) return m+1;
  *(p+2)=(x.l>>8)&0xff;
  if (!*(p+2) && (stop==0 || (stop>0 && (x.l&0xffff)==0))) return m+2;
  *(p+3)=x.l&0xff;
  if (!*(p+3) && stop==0) return m+3;
  p+=4,m+=4,a=incr(a,4);
}
@z

@x      
@ The subroutine |mmputchars(buf,size,addr)| puts |size| characters
into the simulated memory starting at address |addr|.

@<Sub...@>=
void mmputchars @,@,@[ARGS((unsigned char*,int,octa))@];@+@t}\6{@>
void mmputchars(buf,size,addr)
  unsigned char *buf;
  int size;
  octa addr;
{
  register unsigned char *p;
  register int m;
  register mem_tetra *ll;
  octa a;
  for (p=buf,m=0,a=addr; m<size;) {
    ll=mem_find(a);@+test_store_bkpt(ll);
    if ((a.l&0x3) || m>size-4) @<Load and write one byte@>@;
    else @<Load and write four bytes@>;
  }
}
@y
@ The subroutine |mmputchars(buf,size,addr)| puts |size| characters
into the simulated memory starting at address |addr|.

@(libmmput.c@>=
#include <stdio.h>
1610
#include <setjmp.h>
1611
#include "libconfig.h"
1612
1613
1614
1615
#include <time.h>
#include "libtype.h"
#include "libglobals.h"
#include "mmixlib.h"
1616
#include "libarith.h"
1617
#include "libimport.h"
1618
1619
1620
1621
1622
1623
1624

void mmputchars(unsigned char *buf,int size,octa addr)
{
  register unsigned char *p;
  register int m;
  octa x;
  octa a;
1625
  MMIX_LOCAL_LL
1626
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  for (p=buf,m=0,a=addr; m<size;) {
    if ((a.l&0x7) || m+8>size) @<Load and write one byte@>@;
    else @<Load and write eight bytes@>;
  }
}
@z

@x
@ @<Load and write one byte@>=
{
  register int s=8*((~a.l)&0x3);
  ll->tet^=(((ll->tet>>s)^*p)&0xff)<<s;
  p++,m++,a=incr(a,1);
}

@ @<Load and write four bytes@>=
{
  ll->tet=(*p<<24)+(*(p+1)<<16)+(*(p+2)<<8)+*(p+3);
  p+=4,m+=4,a=incr(a,4);
}
@y
@ @<Load and write one byte@>=
{
  x.l=*p;
  x.h=0;
1651
  MMIX_STB(x,a);
1652
1653
1654
1655
1656
1657
1658
1659
  p++,m++,a=incr(a,1);
}

@ @<Load and write eight bytes@>=
{ x.h=(*p<<24)+(*(p+1)<<16)+(*(p+2)<<8)+*(p+3);
  p+=4;
  x.l=(*p<<24)+(*(p+1)<<16)+(*(p+2)<<8)+*(p+3);
  p+=4;
1660
  MMIX_STO(x,a);
1661
1662
1663
1664
  m+=8,a=incr(a,8);
}
@z

1665
1666
1667
1668
1669
1670
1671
1672
1673
The next function is used for mmixware ftraps

@x
@<Sub...@>=
char stdin_chr @,@,@[ARGS((void))@];@+@t}\6{@>
@y
@(libstdin.c@>=
#include <stdlib.h>
#include <stdio.h>
1674
#include <setjmp.h>
1675
#include "libconfig.h"
1676
1677
1678
1679
#include <time.h>
#include "libtype.h"
#include "libglobals.h"
#include "mmixlib.h"
1680
#include "libimport.h"
1681

1682
1683
1684
1685
1686

char stdin_chr @,@,@[ARGS((void))@];@+@t}\6{@>
@z


1687
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@x
@ We are finally ready for the last case.
@y
@ We do similar things for a trap interrupt.

Interrupt bits in rQ might be lost if they are set between a \.{GET}
and a~\.{PUT}. Therefore we don't allow \.{PUT} to zero out bits that
have become~1 since the most recently committed \.{GET}.

@<Glob...@>=
octa new_Q; /* when rQ increases in any bit position, so should this */

@ Now we can implement external interrupts.

@<Check for trap interrupt@>=
if (!resuming)
{ 
  MMIX_GET_INTERRUPT;
  if ((g[rK].h & g[rQ].h) != 0 || (g[rK].l & g[rQ].l) != 0) 
  { /*this is a dynamic trap */
    x.h=sign_bit, x.l=inst;
    if (tracing)
      printf("Dynamic TRAP: rQ=%08x%08x rK=%08x%08x\n",
            g[rQ].h, g[rQ].l, g[rK].h, g[rK].l);
    @<Initiate a trap interrupt@>
    inst_ptr=y=g[rTT];
  }
}

@ An instruction will not be executed if it violates the basic
security rule of \MMIX: An instruction in a nonnegative location
should not be performed unless all eight of the internal interrupts
have been enabled in the interrupt mask register~rK.
Conversely, an instruction in a negative location should not be performed
if the |P_BIT| is enabled in~rK.

The nonnegative-location case turns on the |S_BIT| of both rK and~rQ\null,
leading to an immediate interrupt.

@<Check for security violation@>=
{
  if (inst_ptr.h&sign_bit)
  { if (g[rK].h&P_BIT) 
    { g[rQ].h |= P_BIT;
      new_Q.h |= P_BIT;
      goto security_inst;
    }
  }
  else
  { if ((g[rK].h&0xff)!=0xff)
    { g[rQ].h |= S_BIT;
      new_Q.h |= S_BIT;
      g[rK].h |= S_BIT;
      goto security_inst;
    }
  }
}


@ Here are the bit codes that affect traps. The first eight
cases apply to the upper half of~rQ the next eight to the lower half.

@d P_BIT (1<<0) /* instruction in privileged location */
@d S_BIT (1<<1) /* security violation */
@d B_BIT (1<<2) /* instruction breaks the rules */
@d K_BIT (1<<3) /* instruction for kernel only */
@d N_BIT (1<<4) /* virtual translation bypassed */
@d PX_BIT (1<<5) /* permission lacking to execute from page */
@d PW_BIT (1<<6) /* permission lacking to write on page */
@d PR_BIT (1<<7) /* permission lacking to read from page */

@d PF_BIT (1<<0) /* power fail */
@d MP_BIT (1<<1) /* memory parity error */
@d NM_BIT (1<<2) /* non existent memory */
@d YY_BIT (1<<3) /* unassigned */
@d RE_BIT (1<<4) /* rebooting */
@d CP_BIT (1<<5) /* page fault */
@d PT_BIT (1<<6) /* page table error */
@d IN_BIT (1<<7) /* interval counter rI reaches zero */

@ We need this:
    
@ @<Initiate a trap interrupt@>=
 g[rWW]=inst_ptr;
 g[rXX]=x;
 g[rYY]=y;
 g[rZZ]=z;
 z.h=0, z.l=zz;
 g[rK].h = g[rK].l = 0;
 g[rBB]=g[255];
 g[255]=g[rJ];

@ We are finally ready for the last case.
@z

@x
case RESUME:@+if (xx || yy || zz) goto illegal_inst;
inst_ptr=z=g[rW];
b=g[rX];
if (!(b.h&sign_bit)) @<Prepare to perform a ropcode@>;
break;
@y
case RESUME:@+if (xx || yy) goto illegal_inst;
rzz=zz;
if ( rzz == 0)
{ if (!(loc.h&sign_bit) && (g[rW].h&sign_bit)) 
  goto protection_violation;
  inst_ptr=z=g[rW];
  b=g[rX];
}
else if ( rzz == 1)
{ 
  if (!(loc.h&sign_bit)) goto privileged_inst;
  inst_ptr=z=g[rWW];
  b=g[rXX];
  g[rK]=g[255];
  x=g[255]=g[rBB];
  @<Check for security violation@>
  if (interact_after_resume)
1806
  { breakpoint|=trace_bit;
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
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1820
1821
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1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
    interact_after_resume = false;
  }
}
else goto illegal_inst;
if (!(b.h&sign_bit)) @<Prepare to perform a ropcode@>
break;
@z


@x
@d RESUME_AGAIN 0 /* repeat the command in rX as if in location $\rm rW-4$ */
@d RESUME_CONT 1 /* same, but substitute rY and rZ for operands */
@d RESUME_SET 2 /* set register \$X to rZ */
@y
@d RESUME_AGAIN 0 /* repeat the command in rX as if in location $\rm rW-4$ */
@d RESUME_CONT 1 /* same, but substitute rY and rZ for operands */
@d RESUME_SET 2 /* set register \$X to rZ */
@d RESUME_TRANS 3 /* install $\rm(rY,rZ)$ into IT-cache or DT-cache,
        then |RESUME_AGAIN| */
@z

@x
@<Prepare to perform a ropcode@>=
{
  rop=b.h>>24; /* the ropcode is the leading byte of rX */
  switch (rop) {
 case RESUME_CONT:@+if ((1<<(b.l>>28))&0x8f30) goto illegal_inst;
 case RESUME_SET: k=(b.l>>16)&0xff;
   if (k>=L && k<G) goto illegal_inst;
 case RESUME_AGAIN:@+if ((b.l>>24)==RESUME) goto illegal_inst;
   break;
 default: goto illegal_inst;
  }
  resuming=true;
}

@ @<Install special operands when resuming an interrupted operation@>=
if (rop==RESUME_SET) {
    op=ORI;
    y=g[rZ];
    z=zero_octa;
    exc=g[rX].h&0xff00;
    f=X_is_dest_bit;
}@+else { /* |RESUME_CONT| */
  y=g[rY];
  z=g[rZ];
}
@y
@<Prepare to perform a ropcode@>=
{
  rop=b.h>>24; /* the ropcode is the leading byte of rX */
  switch (rop) {
 case RESUME_CONT:@+if ((1<<(b.l>>28))&0x8f30) goto illegal_inst;
 case RESUME_SET: k=(b.l>>16)&0xff;
   if (k>=L && k<G) goto illegal_inst;
 case RESUME_AGAIN:@+if ((b.l>>24)==RESUME) goto illegal_inst;
   break;
 case RESUME_TRANS:@+if (rzz==0) goto illegal_inst;
   break;
 default: goto illegal_inst;
  }
  resuming=true;
}

@ @<Install special operands when resuming an interrupted operation@>=
if (rzz == 0)
{ if (rop==RESUME_SET) {
    op=ORI;
    y=g[rZ];
    z=zero_octa;
    exc=g[rX].h&0xff00;
    f=X_is_dest_bit;
  }@+else if (rop == RESUME_CONT) {
  y=g[rY];
  z=g[rZ];
  }
}
else
{ if (rop==RESUME_SET) {
    op=ORI;
    y=g[rZZ];
    z=zero_octa;
    exc=g[rXX].h&0xff00;
    f=X_is_dest_bit;
  } else if (rop==RESUME_TRANS)
  {  if ((b.l>>24)==SWYM) 
1893
       MMIX_STORE_IVTC(g[rYY], g[rZZ]);
1894
     else
1895
       MMIX_STORE_DVTC(g[rYY], g[rZZ]);
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
  }@+else if (rop == RESUME_CONT) {
  y=g[rYY];
  z=g[rZZ];
  }
}
@z

@x
  if (g[rI].l<=info[op].oops && g[rI].l && g[rI].h==0) tracing=breakpoint=true;
@y