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forth.c
541 lines (469 loc) · 13 KB
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forth.c
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#include <linux/gfp.h>
#include <linux/slab.h>
#include "linux/types.h"
#include "forth_img.h"
#include "stddef.h"
#include <linux/circ_buf.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/kallsyms.h>
#include "forth.h"
/* +------------------------------------+----------+---------------------------+-----------+
* | NFA | LFA | CFA | PFA |
* +-------+--------+----------+--------+----------+----------+----------+-----+-----------+
* | flags | length | name | length | link | c_length | code | ret | code/data |
* +-------+--------+----------+--------+----------+----------+----------+-----+-----------+
* | 1b | 1b | length b | 1b | 1 cell | 1b |c_length b| 1b | ?b |
* +-------+--------+----------+--------+----------+----------+----------+-----+-----------+
*/
static struct task_struct * forthThread = NULL;
static inline void push(forth_context_type *fc, size_t val)
{
fc->SP-=fc->cell;
*(size_t *)(fc->mem+(fc->SP))=val;
}
static inline size_t pop(forth_context_type *fc)
{
size_t val;
val=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
return val;
}
static inline void dup(forth_context_type *fc)
{
*(size_t *)(fc->mem+fc->SP-fc->cell)=*(size_t *)(fc->mem+fc->SP);
fc->SP-=fc->cell;
}
static inline void swap_(forth_context_type *fc)
{
size_t *c1,*c2,tmp;
c1=(size_t *)(fc->mem+fc->SP+fc->cell);
c2=(size_t *)(fc->mem+fc->SP);
tmp=*c1;
*c1=*c2;
*c2=tmp;
}
static inline size_t next_cell(forth_context_type *fc)
{
size_t val,val_;
char i;
val=0;
for(i=0;i<fc->cell;i++)
{
val_=(*(fc->mem+(fc->PC++)));
val|=val_<<(8*i);
}
return val;
}
static inline void add(forth_context_type *fc)
{
*(size_t *)(fc->mem+(fc->SP+fc->cell))+=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void sub(forth_context_type *fc)
{
*(size_t *)(fc->mem+(fc->SP+fc->cell))-=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void mul(forth_context_type *fc)
{
*(ptrdiff_t *)(fc->mem+(fc->SP+fc->cell))*=*(ptrdiff_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void div_(forth_context_type *fc)
{
*(ptrdiff_t *)(fc->mem+(fc->SP+fc->cell))/=*(ptrdiff_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void udiv(forth_context_type *fc)
{
*(size_t *)(fc->mem+(fc->SP+fc->cell))/=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void mod(forth_context_type *fc)
{
*(ptrdiff_t *)(fc->mem+(fc->SP+fc->cell))%=*(ptrdiff_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void umod(forth_context_type *fc)
{
*(size_t *)(fc->mem+(fc->SP+fc->cell))%=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void and(forth_context_type *fc)
{
*(size_t *)(fc->mem+(fc->SP+fc->cell))&=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void or(forth_context_type *fc)
{
*(size_t *)(fc->mem+(fc->SP+fc->cell))|=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void xor(forth_context_type *fc)
{
*(size_t *)(fc->mem+(fc->SP+fc->cell))^=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void branch(forth_context_type *fc)
{
size_t adr;
adr=next_cell(fc);
fc->PC=adr;
}
static inline void cbranch(forth_context_type *fc)
{
size_t adr,val;
val=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
if(!val)
{
adr=next_cell(fc);
fc->PC=adr;
}
else next_cell(fc);
}
static inline void call(forth_context_type *fc)
{
size_t adr;
adr=next_cell(fc);
fc->RP-=fc->cell;
*(size_t *)(fc->mem+(fc->RP))=fc->PC;
fc->PC=adr;
}
static inline void ret(forth_context_type *fc)
{
size_t adr;
adr=*(size_t *)(fc->mem+(fc->RP));
fc->RP+=fc->cell;
fc->PC=adr;
}
static inline void more(forth_context_type *fc)
{
ptrdiff_t val1,val2;
val2=*(ptrdiff_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
val1=*(ptrdiff_t *)(fc->mem+(fc->SP));
*(size_t *)(fc->mem+(fc->SP))= (val1 > val2) ? -1 : 0;
}
static inline void less(forth_context_type *fc)
{
ptrdiff_t val1,val2;
val2=*(ptrdiff_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
val1=*(ptrdiff_t *)(fc->mem+(fc->SP));
*(size_t *)(fc->mem+(fc->SP))= (val1 < val2) ? -1 : 0;
}
static inline void eq(forth_context_type *fc)
{
size_t val1,val2;
val2=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
val1=*(size_t *)(fc->mem+(fc->SP));
*(size_t *)(fc->mem+(fc->SP))= (val1 == val2) ? -1 : 0;
}
static inline void at(forth_context_type *fc)
{
size_t val;
val=*(size_t *)(fc->mem+(fc->SP));
*(size_t *)(fc->mem+(fc->SP))=*(size_t *)(fc->mem+val);
}
static inline void cat(forth_context_type *fc)
{
size_t val;
val=*(size_t *)(fc->mem+(fc->SP));
*(size_t *)(fc->mem+(fc->SP))=(*(size_t *)(fc->mem+val)) & 0xff;
}
static inline void to(forth_context_type *fc)
{
size_t adr,val;
adr=*(size_t *)(fc->mem+(fc->SP)); fc->SP+=fc->cell;
val=*(size_t *)(fc->mem+(fc->SP)); fc->SP+=fc->cell;
*(size_t *)(fc->mem+adr)=val;
}
static inline void cto(forth_context_type *fc)
{
size_t adr,val;
adr=*(size_t *)(fc->mem+(fc->SP)); fc->SP+=fc->cell;
val=(*(size_t *)(fc->mem+(fc->SP))) & 0xff; fc->SP+=fc->cell;
*(fc->mem+adr)=val;
}
static inline void to_r(forth_context_type *fc)
{
fc->RP-=fc->cell;
*(size_t *)(fc->mem+(fc->RP))=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void from_r(forth_context_type *fc)
{
fc->SP-=fc->cell;
*(size_t *)(fc->mem+(fc->SP))=*(size_t *)(fc->mem+(fc->RP));
fc->RP+=fc->cell;
}
static inline void in(forth_context_type *fc)
{
fc->SP-=fc->cell;
*(size_t *)(fc->mem+(fc->SP))=fc->in.buf[fc->in.tail];
fc->in.tail=(fc->in.tail+1) & (TIB_SIZE-1);
}
static inline void in_ready(forth_context_type *fc)
{
fc->SP-=fc->cell;
*(size_t *)(fc->mem+(fc->SP))= (CIRC_CNT(fc->in.head,fc->in.tail,TIB_SIZE));
}
static inline void out(forth_context_type *fc)
{
fc->out.buf[fc->out.head]=0xff & (*(size_t *)(fc->mem+(fc->SP)) );
fc->SP+=fc->cell;
fc->out.head=(fc->out.head+1) & (TIB_SIZE-1);
}
static inline void out_ready(forth_context_type *fc)
{
fc->SP-=fc->cell;
*(size_t *)(fc->mem+(fc->SP))=CIRC_SPACE(fc->out.head,fc->out.tail,TIB_SIZE);
}
void put_to_in(forth_context_type *fc, char c)
{
set_current_state(TASK_INTERRUPTIBLE);
while (CIRC_SPACE(fc->in.head,fc->in.tail,TIB_SIZE)==0)
{
schedule_timeout(1);
set_current_state(TASK_INTERRUPTIBLE);
if(fc->stop) return;
}
set_current_state(TASK_RUNNING);
fc->in.buf[fc->in.head]=c;
fc->in.head=(fc->in.head+1) & (TIB_SIZE-1);
}
char read_from_out(forth_context_type *fc)
{
char c;
set_current_state(TASK_INTERRUPTIBLE);
while (CIRC_CNT(fc->out.head,fc->out.tail,TIB_SIZE)==0)
{
schedule_timeout(1);
set_current_state(TASK_INTERRUPTIBLE);
if(fc->stop) return 0;
}
set_current_state(TASK_RUNNING);
c=fc->out.buf[fc->out.tail];
fc->out.tail=(fc->out.tail+1) & (TIB_SIZE-1);
return c;
}
static inline void shl(forth_context_type *fc)
{
*(size_t *)(fc->mem+(fc->SP+fc->cell))<<=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void shr(forth_context_type *fc)
{
*(size_t *)(fc->mem+(fc->SP+fc->cell))<<=*(size_t *)(fc->mem+(fc->SP));
fc->SP+=fc->cell;
}
static inline void adr0(forth_context_type *fc)
{
push(fc,(size_t)fc->mem);
}
static inline void kalsym_lookup(forth_context_type *fc)
{
size_t *sp;
char *str;
sp=(size_t *)(fc->mem+(fc->SP));
str=(char *)*sp;
*sp=kallsyms_lookup_name(str);
// printk("PAR:%lu,'%s'\n",strlen(str),str);
}
static inline void kcall(forth_context_type *fc) // arg1, arg2, arg3...argN, N, adr -- retval
{
size_t N;
size_t adr;
size_t args[KARGS];
size_t ret=0;
int i;
kall0 f0;
kall1 f1;
kall2 f2;
kall3 f3;
kall4 f4;
kall5 f5;
kall6 f6;
kall7 f7;
kall8 f8;
kall9 f9;
kall10 f10;
kall11 f11;
kall12 f12;
kall13 f13;
kall14 f14;
kall15 f15;
kall16 f16;
adr=pop(fc);
N=pop(fc);
for(i=1;i<=N;i++)
{
args[N-i]=pop(fc);
}
switch(N)
{
case 0: f0=(kall0)adr;
ret=f0();
break;
case 1: f1=(kall1)adr;
ret=f1(args[0]);
break;
case 2: f2=(kall2)adr;
ret=f2(args[0],args[1]);
break;
case 3: f3=(kall3)adr;
ret=f3(args[0],args[1],args[2]);
break;
case 4: f4=(kall4)adr;
ret=f4(args[0],args[1],args[2],args[3]);
break;
case 5: f5=(kall5)adr;
ret=f5(args[0],args[1],args[2],args[3],args[4]);
break;
case 6: f6=(kall6)adr;
ret=f6(args[0],args[1],args[2],args[3],args[4],args[5]);
break;
case 7: f7=(kall7)adr;
ret=f7(args[0],args[1],args[2],args[3],args[4],args[5],args[6]);
break;
case 8: f8=(kall8)adr;
ret=f8(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7]);
break;
case 9: f9=(kall9)adr;
ret=f9(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8]);
break;
case 10: f10=(kall10)adr;
ret=f10(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9]);
break;
case 11: f11=(kall11)adr;
ret=f11(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10]);
break;
case 12: f12=(kall12)adr;
ret=f12(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10],args[11]);
break;
case 13: f13=(kall13)adr;
ret=f13(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10],args[11],args[12]);
break;
case 14: f14=(kall14)adr;
ret=f14(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10],args[11],args[12],args[13]);
break;
case 15: f15=(kall15)adr;
ret=f15(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10],args[11],args[12],args[13],args[14]);
break;
case 16: f16=(kall16)adr;
ret=f16(args[0],args[1],args[2],args[3],args[4],args[5],args[6],args[7],args[8],args[9],args[10],args[11],args[12],args[13],args[14],args[15]);
break;
}
push(fc,ret);
}
static inline void forth_vm_execute_instruction(forth_context_type *fc, char cmd)
{
// printf("%c\n",cmd);
// getchar();
switch(cmd)
{
case '0': push(fc,0); break;
case '1': push(fc,1); break;
case '2': push(fc,2); break;
case '3': push(fc,3); break;
case '4': push(fc,4); break;
case '5': push(fc,5); break;
case '6': push(fc,6); break;
case '7': push(fc,7); break;
case '8': push(fc,8); break;
case '9': push(fc,9); break;
case '@': at(fc); break; //@
case '!': to(fc); break; //!
case 'd': fc->SP+=fc->cell; break; //drop
case 'D': dup(fc); break; //dup
case 's': swap_(fc); break; //swap
case 'l': push(fc,next_cell(fc)); break; //lit
case '+': add(fc); break; //+
case '-': sub(fc); break; //-
case '*': mul(fc); break; //*
case '/': div_(fc); break; // /
case '%': mod(fc); break; //mod
case '&': and(fc); break; // and
case '|': or(fc); break; // or
case '^': xor(fc); break; // xor
case '>': more(fc); break; // >
case '<': less(fc); break; // <
case '=': eq(fc); break; // =
case 'b': branch(fc); break; // branch
case '?': cbranch(fc); break; // ?branch
case 'c': call(fc); break; // call
case 'r': ret(fc); break; // ret
case 't': to_r(fc); break; // >R
case 'f': from_r(fc); break; // R>
case 'i': in(fc); break; // in
case 'o': out(fc); break; // out
case '_': fc->stop=1; break; // stop
case 'A': adr0(fc); break; // @0
case 1: push(fc,fc->SP); break; // SP@
case 2: fc->SP=pop(fc); break; // SP!
case 3: push(fc,fc->RP); break; // RP@
case 4: fc->RP=pop(fc); break; // RP!
case 5: shl(fc); break; // <<
case 6: shr(fc); break; // >>
case 7: push(fc,*(size_t *)(fc->mem+fc->RP)); break; // i
case 8: cat(fc); break; // c@
case 9: cto(fc); break; // c!
case 10: set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(1); break; // nop
case 11: in_ready(fc); break; // ?in
case 12: out_ready(fc); break; // ?out
case 16: umod(fc); break; // umod
case 17: udiv(fc); break; // u/
// kernel
case 'K': kalsym_lookup(fc); break; // lookup kallsym address
case 18: kcall(fc); break; // kcall
}
}
static int forth_vm_main_loop(void *data)
{
forth_context_type *fc;
char cmd;
fc=data;
if(fc==NULL) return 0;
while(fc->stop==0)
{
if(kthread_should_stop()) break;
cmd=*(fc->mem+fc->PC++);
forth_vm_execute_instruction(fc,cmd);
}
//if(fc->stop) do_exit(0);
return 0;
}
forth_context_type* forth_init(void)
{
size_t i;
forth_context_type* fc;
fc=kmalloc(sizeof(forth_context_type),GFP_KERNEL);
if(fc==NULL) return fc;
fc->in.buf=kmalloc(TIB_SIZE,GFP_KERNEL);
fc->out.buf=kmalloc(TIB_SIZE,GFP_KERNEL);
fc->in.tail=0; fc->in.head=0;
fc->out.tail=0; fc->out.head=0;
fc->mem=kmalloc(MEM_SIZE,GFP_KERNEL);
for(i=0;i<forth_img_length;i++) fc->mem[i]=forth_img[i];
fc->cell=sizeof(size_t);
fc->PC=0;
fc->stop=0;
fc->SP=128; // pre-init stacks
fc->RP=256; //
forthThread=kthread_run(forth_vm_main_loop,fc,"Kforth");
// forth_vm_main_loop(fc);
return fc;
}
void forth_done(forth_context_type *fc)
{
if (fc==NULL) return;
fc->stop=1;
kthread_stop(forthThread);
kfree(fc->mem);
kfree(fc->out.buf);
kfree(fc->in.buf);
kfree(fc);
}