mirror of
https://github.com/ringtailsoftware/uvm32.git
synced 2026-06-06 06:53:39 +00:00
Add Arduino host sample.
Tested on Arduino Uno (ATMega328P)
Sketch uses 9950 bytes (30%) of program storage space. Maximum is 32256 bytes.
Global variables use 1254 bytes (61%) of dynamic memory, leaving 794 bytes for local variables. Maximum is 2048 bytes.
This commit is contained in:
Toby Jaffey
parent
047c9e3853
commit
6d12ce5a80
8 changed files with 968 additions and 0 deletions
200
emulator-arduino/uvm32.cpp
Normal file
200
emulator-arduino/uvm32.cpp
Normal file
|
|
@ -0,0 +1,200 @@
|
|||
#include "config.h"
|
||||
#define MINIRV32_IMPLEMENTATION
|
||||
#include "uvm32.h"
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
|
||||
#ifndef UVM32_MEMORY_SIZE
|
||||
#error Define UVM32_MEMORY_SIZE
|
||||
#endif
|
||||
|
||||
#include "mini-rv32ima.h"
|
||||
|
||||
#define X(name) #name,
|
||||
static const char *errNames[] = {
|
||||
LIST_OF_UVM32_ERRS
|
||||
};
|
||||
#undef X
|
||||
|
||||
static void setup_err_evt(uvm32_state_t *vmst, uvm32_evt_t *evt) {
|
||||
evt->typ = UVM32_EVT_ERR;
|
||||
evt->data.err.errcode = vmst->err;
|
||||
evt->data.err.errstr = errNames[vmst->err];
|
||||
}
|
||||
|
||||
static void setStatus(uvm32_state_t *vmst, uvm32_status_t newStatus) {
|
||||
if (vmst->status == UVM32_STATUS_ERROR) {
|
||||
// always stay in error state until a uvm32_reset()
|
||||
return;
|
||||
} else {
|
||||
vmst->status = newStatus;
|
||||
}
|
||||
}
|
||||
|
||||
static void setStatusErr(uvm32_state_t *vmst, uvm32_err_t err) {
|
||||
setStatus(vmst, UVM32_STATUS_ERROR);
|
||||
vmst->err = err;
|
||||
}
|
||||
|
||||
void uvm32_init(uvm32_state_t *vmst, const uvm32_mapping_t *mappings, uint32_t numMappings) {
|
||||
vmst->status = UVM32_STATUS_PAUSED;
|
||||
|
||||
memset(vmst->memory, 0x00, UVM32_MEMORY_SIZE);
|
||||
// The core lives at the end of RAM.
|
||||
vmst->core = (struct MiniRV32IMAState*)(vmst->memory + UVM32_MEMORY_SIZE - sizeof(struct MiniRV32IMAState));
|
||||
vmst->core->pc = MINIRV32_RAM_IMAGE_OFFSET;
|
||||
// https://projectf.io/posts/riscv-cheat-sheet/
|
||||
// setup stack pointer
|
||||
// la sp, _sstack
|
||||
// addi sp,sp,-16
|
||||
vmst->core->regs[2] = (MINIRV32_RAM_IMAGE_OFFSET + UVM32_MEMORY_SIZE) - 16;
|
||||
vmst->core->regs[10] = 0x00; //hart ID
|
||||
vmst->core->regs[11] = 0;
|
||||
vmst->core->extraflags |= 3; // Machine-mode.
|
||||
|
||||
vmst->mappings = mappings;
|
||||
vmst->numMappings = numMappings;
|
||||
}
|
||||
|
||||
bool uvm32_load(uvm32_state_t *vmst, uint8_t *rom, int len) {
|
||||
// RAM needs at least image then MiniRV32IMAState (core)
|
||||
if (len > UVM32_MEMORY_SIZE - sizeof(struct MiniRV32IMAState)) {
|
||||
// too big
|
||||
return false;
|
||||
}
|
||||
|
||||
memcpy(vmst->memory, rom, len);
|
||||
return true;
|
||||
}
|
||||
|
||||
uint32_t uvm32_run(uvm32_state_t *vmst, uvm32_evt_t *evt, uint32_t instr_meter) {
|
||||
uint32_t num_instr = 0;
|
||||
if (vmst->status != UVM32_STATUS_PAUSED) {
|
||||
setStatusErr(vmst, UVM32_ERR_NOTREADY);
|
||||
setup_err_evt(vmst, evt);
|
||||
return num_instr;
|
||||
}
|
||||
|
||||
setStatus(vmst, UVM32_STATUS_RUNNING);
|
||||
|
||||
// run CPU until no longer in running state
|
||||
while(vmst->status == UVM32_STATUS_RUNNING) {
|
||||
uint64_t elapsedUs = 1;
|
||||
if (0 != MiniRV32IMAStep(vmst, vmst->core, vmst->memory, 0, elapsedUs, 1)) {
|
||||
setStatusErr(vmst, UVM32_ERR_INTERNAL_CORE);
|
||||
setup_err_evt(vmst, evt);
|
||||
}
|
||||
|
||||
num_instr++;
|
||||
|
||||
// check instruction meter, in case of hang/infinite loop
|
||||
if (instr_meter-- == 0) {
|
||||
setStatusErr(vmst, UVM32_ERR_HUNG);
|
||||
setup_err_evt(vmst, evt);
|
||||
return num_instr;
|
||||
}
|
||||
}
|
||||
|
||||
if (vmst->status == UVM32_STATUS_ENDED) {
|
||||
evt->typ = UVM32_EVT_END;
|
||||
return num_instr;
|
||||
}
|
||||
|
||||
// an event is ready
|
||||
if (vmst->status == UVM32_STATUS_PAUSED) {
|
||||
// send back the built up event
|
||||
memcpy(evt, &vmst->ioevt, sizeof(uvm32_evt_t));
|
||||
return num_instr;
|
||||
} else {
|
||||
if (vmst->status == UVM32_STATUS_ERROR) {
|
||||
setup_err_evt(vmst, evt);
|
||||
} else {
|
||||
setStatusErr(vmst, UVM32_ERR_INTERNAL_STATE);
|
||||
setup_err_evt(vmst, evt);
|
||||
}
|
||||
return num_instr;
|
||||
}
|
||||
}
|
||||
|
||||
// Read C-string up to terminator and return len,ptr
|
||||
static void get_safeptr_terminated(uvm32_state_t *vmst, uint32_t addr, uint8_t terminator, uvm32_evt_ioreq_buf_t *buf) {
|
||||
uint32_t ptrstart = addr - MINIRV32_RAM_IMAGE_OFFSET;
|
||||
uint32_t p = ptrstart;
|
||||
if (p >= UVM32_MEMORY_SIZE) {
|
||||
setStatusErr(vmst, UVM32_ERR_MEM_RD);
|
||||
buf->ptr = NULL;
|
||||
buf->len = 0;
|
||||
return;
|
||||
}
|
||||
while(vmst->memory[p] != terminator) {
|
||||
p++;
|
||||
if (p >= UVM32_MEMORY_SIZE) {
|
||||
setStatusErr(vmst, UVM32_ERR_MEM_RD);
|
||||
buf->ptr = NULL;
|
||||
buf->len = 0;
|
||||
return;
|
||||
}
|
||||
}
|
||||
buf->ptr = &vmst->memory[ptrstart];
|
||||
buf->len = p - ptrstart;
|
||||
}
|
||||
|
||||
static void get_safeptr(uvm32_state_t *vmst, uint32_t addr, uint32_t len, uvm32_evt_ioreq_buf_t *buf) {
|
||||
uint32_t ptrstart = addr - MINIRV32_RAM_IMAGE_OFFSET;
|
||||
if (ptrstart + len >= UVM32_MEMORY_SIZE) {
|
||||
setStatusErr(vmst, UVM32_ERR_MEM_RD);
|
||||
}
|
||||
buf->ptr = &vmst->memory[ptrstart];
|
||||
buf->len = len;
|
||||
}
|
||||
|
||||
void uvm32_HandleOtherCSRWrite(void *userdata, uint16_t csrno, uint32_t value) {
|
||||
uvm32_evt_ioreq_buf_t b;
|
||||
uvm32_state_t *vmst = (uvm32_state_t *)userdata;
|
||||
|
||||
switch(csrno) {
|
||||
case IOREQ_HALT:
|
||||
setStatus(vmst, UVM32_STATUS_ENDED);
|
||||
break;
|
||||
case IOREQ_YIELD:
|
||||
vmst->ioevt.typ = UVM32_EVT_YIELD;
|
||||
setStatus(vmst, UVM32_STATUS_PAUSED);
|
||||
break;
|
||||
|
||||
default:
|
||||
// search in mappings
|
||||
for (int i=0;i<vmst->numMappings;i++) {
|
||||
if (csrno == vmst->mappings[i].csr) {
|
||||
// setup ioevt.data according to mapping typ
|
||||
switch(vmst->mappings[i].typ) {
|
||||
case IOREQ_TYP_VOID:
|
||||
break;
|
||||
case IOREQ_TYP_U32_WR:
|
||||
vmst->ioevt.data.ioreq.val.u32 = value;
|
||||
break;
|
||||
case IOREQ_TYP_BUF_TERMINATED_WR:
|
||||
get_safeptr_terminated(vmst, value, 0x00, &vmst->ioevt.data.ioreq.val.buf);
|
||||
break;
|
||||
case IOREQ_TYP_U32_RD:
|
||||
get_safeptr(vmst, value, 4, &b);
|
||||
vmst->ioevt.data.ioreq.val.u32p = (uint32_t *)b.ptr;
|
||||
break;
|
||||
}
|
||||
vmst->ioevt.typ = UVM32_EVT_IOREQ;
|
||||
vmst->ioevt.data.ioreq.code = vmst->mappings[i].code;
|
||||
vmst->ioevt.data.ioreq.typ = vmst->mappings[i].typ;
|
||||
setStatus(vmst, UVM32_STATUS_PAUSED);
|
||||
return;
|
||||
}
|
||||
}
|
||||
// no mapping found
|
||||
setStatusErr(vmst, UVM32_ERR_BAD_CSR);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
bool uvm32_hasEnded(const uvm32_state_t *vmst) {
|
||||
return vmst->status == UVM32_STATUS_ENDED;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue