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osd-contiki/examples/osd/embedd-vm-merkurboard/embedvm.c
Harald Pichler d85ce4b42b initial upload
2014-11-19 13:32:12 +01:00

312 lines
7.8 KiB
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/*
* EmbedVM - Embedded Virtual Machine for uC Applications
*
* Copyright (C) 2011 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "embedvm.h"
static inline int16_t signext(uint16_t val, uint16_t mask)
{
val = val & mask;
if ((val & ~(mask >> 1)) != 0)
val |= ~mask;
return val;
}
extern void embedvm_exec(struct embedvm_s *vm)
{
uint8_t opcode = vm->mem_read(vm->ip, false, vm->user_ctx);
uint16_t addr = 0;
int16_t a = 0, b = 0;
int8_t sfa = 0;
switch (opcode)
{
case 0x00 ... 0x3f:
sfa = signext(opcode, 0x3f);
embedvm_push(vm, embedvm_local_read(vm, sfa));
vm->ip++;
break;
case 0x40 ... 0x7f:
sfa = signext(opcode, 0x3f);
embedvm_local_write(vm, sfa, embedvm_pop(vm));
vm->ip++;
break;
case 0x80+0 ... 0x80+11:
case 0xa8+0 ... 0xa8+5:
b = embedvm_pop(vm);
case 0x80+12 ... 0x80+14:
a = embedvm_pop(vm);
switch (opcode)
{
case 0x80 + 0: embedvm_push(vm, a + b); break;
case 0x80 + 1: embedvm_push(vm, a - b); break;
case 0x80 + 2: embedvm_push(vm, a * b); break;
case 0x80 + 3: embedvm_push(vm, a / b); break;
case 0x80 + 4: embedvm_push(vm, a % b); break;
case 0x80 + 5: embedvm_push(vm, a << b); break;
case 0x80 + 6: embedvm_push(vm, a >> b); break;
case 0x80 + 7: embedvm_push(vm, a & b); break;
case 0x80 + 8: embedvm_push(vm, a | b); break;
case 0x80 + 9: embedvm_push(vm, a ^ b); break;
case 0x80 + 10: embedvm_push(vm, a && b); break;
case 0x80 + 11: embedvm_push(vm, a || b); break;
case 0x80 + 12: embedvm_push(vm, ~a); break;
case 0x80 + 13: embedvm_push(vm, -a); break;
case 0x80 + 14: embedvm_push(vm, !a); break;
case 0xa8 + 0: embedvm_push(vm, a < b); break;
case 0xa8 + 1: embedvm_push(vm, a <= b); break;
case 0xa8 + 2: embedvm_push(vm, a == b); break;
case 0xa8 + 3: embedvm_push(vm, a != b); break;
case 0xa8 + 4: embedvm_push(vm, a >= b); break;
case 0xa8 + 5: embedvm_push(vm, a > b); break;
}
vm->ip++;
break;
case 0x90 ... 0x97:
a = signext(opcode, 0x07);
if ((a & 0x04) != 0)
a |= ~0x07;
embedvm_push(vm, a);
vm->ip++;
break;
case 0x98:
a = vm->mem_read(vm->ip+1, false, vm->user_ctx) & 0x00ff;
embedvm_push(vm, a);
vm->ip += 2;
break;
case 0x99:
a = vm->mem_read(vm->ip+1, false, vm->user_ctx) & 0x00ff;
embedvm_push(vm, signext(a, 0x00ff));
vm->ip += 2;
break;
case 0x9a:
a = vm->mem_read(vm->ip+1, true, vm->user_ctx);
embedvm_push(vm, a);
vm->ip += 3;
break;
case 0x9b:
a = embedvm_pop(vm);
if (0) {
case 0x9c:
a = 0;
}
vm->sp = vm->sfp;
vm->ip = embedvm_pop(vm);
vm->sfp = embedvm_pop(vm);
if ((vm->sfp & 1) != 0)
vm->sfp &= ~1;
else
embedvm_push(vm, a);
break;
case 0x9d:
embedvm_pop(vm);
vm->ip++;
break;
case 0x9e:
addr = embedvm_pop(vm);
if (vm->mem_read(vm->ip+1, false, vm->user_ctx) == 0x9d) {
embedvm_push(vm, vm->sfp | 1);
embedvm_push(vm, vm->ip + 2);
} else {
embedvm_push(vm, vm->sfp);
embedvm_push(vm, vm->ip + 1);
}
vm->sfp = vm->sp;
vm->ip = addr;
break;
case 0x9f:
vm->ip = embedvm_pop(vm);
break;
case 0xa0 ... 0xa0+7:
if ((opcode & 1) == 0) {
addr = vm->ip + signext(vm->mem_read(vm->ip+1, false, vm->user_ctx), 0x00ff);
vm->ip += 2;
} else {
addr = vm->ip + vm->mem_read(vm->ip+1, true, vm->user_ctx);
vm->ip += 3;
}
switch (opcode)
{
case 0xa0:
case 0xa1:
vm->ip = addr;
break;
case 0xa2:
case 0xa3:
if (vm->mem_read(vm->ip, false, vm->user_ctx) == 0x9d) {
embedvm_push(vm, vm->sfp | 1);
embedvm_push(vm, vm->ip + 1);
} else {
embedvm_push(vm, vm->sfp);
embedvm_push(vm, vm->ip);
}
vm->sfp = vm->sp;
vm->ip = addr;
break;
case 0xa4:
case 0xa5:
if (embedvm_pop(vm))
vm->ip = addr;
break;
case 0xa6:
case 0xa7:
if (!embedvm_pop(vm))
vm->ip = addr;
break;
}
break;
case 0xae:
embedvm_push(vm, vm->sp);
vm->ip++;
break;
case 0xaf:
embedvm_push(vm, vm->sfp);
vm->ip++;
break;
case 0xb0 ... 0xb0+15:
{
uint8_t argc = embedvm_pop(vm);
int16_t argv[argc];
for (sfa=0; sfa<argc; sfa++)
argv[sfa] = embedvm_pop(vm);
a = vm->call_user(opcode - 0xb0, argc, argv, vm->user_ctx);
embedvm_push(vm, a);
}
vm->ip++;
break;
case 0xc0 ... 0xef:
if ((opcode & 0x07) == 5) {
/* this is a "bury" instruction */
uint8_t depth = (opcode >> 3) & 0x07;
int16_t stack[depth+1];
for (sfa = 0; sfa <= depth; sfa++)
stack[sfa] = embedvm_pop(vm);
embedvm_push(vm, stack[0]);
for (sfa = depth; sfa > 0; sfa--)
embedvm_push(vm, stack[sfa]);
embedvm_push(vm, stack[0]);
vm->ip++;
break;
}
if ((opcode & 0x07) == 6) {
/* this is a "dig" instruction */
uint8_t depth = (opcode >> 3) & 0x07;
int16_t stack[depth+2];
for (sfa = 0; sfa < depth+2; sfa++)
stack[sfa] = embedvm_pop(vm);
for (sfa = depth+1; sfa > 0; sfa--)
embedvm_push(vm, stack[sfa-1]);
embedvm_push(vm, stack[depth+1]);
vm->ip++;
break;
}
sfa = ((opcode >> 3) & 0x07) == 4 || ((opcode >> 3) & 0x07) == 5 ? 1 : 0;
switch (opcode & 0x07)
{
case 0:
addr = vm->mem_read(vm->ip+1, false, vm->user_ctx) & 0x00ff;
vm->ip += 2;
break;
case 1:
addr = vm->mem_read(vm->ip+1, true, vm->user_ctx);
vm->ip += 3;
break;
case 2:
addr = embedvm_pop(vm);
vm->ip++;
break;
case 3:
addr = (embedvm_pop(vm) << sfa) + (vm->mem_read(vm->ip+1, false, vm->user_ctx) & 0x00ff);
vm->ip += 2;
break;
case 4:
addr = (embedvm_pop(vm) << sfa) + vm->mem_read(vm->ip+1, true, vm->user_ctx);
vm->ip += 3;
break;
}
switch ((opcode >> 3) & 0x07)
{
case 0:
embedvm_push(vm, vm->mem_read(addr, false, vm->user_ctx) & 0x00ff);
break;
case 1:
vm->mem_write(addr, embedvm_pop(vm), false, vm->user_ctx);
break;
case 2:
embedvm_push(vm, signext(vm->mem_read(addr, false, vm->user_ctx), 0x00ff));
break;
case 3:
vm->mem_write(addr, embedvm_pop(vm), false, vm->user_ctx);
break;
case 4:
embedvm_push(vm, vm->mem_read(addr, true, vm->user_ctx));
break;
case 5:
vm->mem_write(addr, embedvm_pop(vm), true, vm->user_ctx);
break;
}
break;
case 0xf0 ... 0xf7:
for (sfa = 0; sfa <= (opcode & 0x07); sfa++)
embedvm_push(vm, 0);
vm->ip++;
break;
case 0xf8 ... 0xff:
a = embedvm_pop(vm);
vm->sp += 2 + 2*(opcode & 0x07);
embedvm_push(vm, a);
vm->ip++;
break;
}
}
void embedvm_interrupt(struct embedvm_s *vm, uint16_t addr)
{
embedvm_push(vm, vm->sfp | 1);
embedvm_push(vm, vm->ip);
vm->sfp = vm->sp;
vm->ip = addr;
}
int16_t embedvm_pop(struct embedvm_s *vm)
{
int16_t value = vm->mem_read(vm->sp, true, vm->user_ctx);
vm->sp += 2;
return value;
}
void embedvm_push(struct embedvm_s *vm, int16_t value)
{
vm->sp -= 2;
vm->mem_write(vm->sp, value, true, vm->user_ctx);
}
int16_t embedvm_local_read(struct embedvm_s *vm, int8_t sfa)
{
uint16_t addr = vm->sfp - 2*sfa + (sfa < 0 ? +2 : -2);
return vm->mem_read(addr, true, vm->user_ctx);
}
void embedvm_local_write(struct embedvm_s *vm, int8_t sfa, int16_t value)
{
uint16_t addr = vm->sfp - 2*sfa + (sfa < 0 ? +2 : -2);
vm->mem_write(addr, value, true, vm->user_ctx);
}
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