// See LICENSE for license details.
#include "sim.h"
-#include "htif.h"
+#include "mmu.h"
+#include "gdbserver.h"
#include <map>
#include <iostream>
+#include <sstream>
#include <climits>
#include <cstdlib>
#include <cassert>
+#include <signal.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <sys/types.h>
-sim_t::sim_t(size_t _nprocs, size_t mem_mb, const std::vector<std::string>& args)
- : htif(new htif_isasim_t(this, args)),
- procs(_nprocs), current_step(0), current_proc(0), debug(false)
+volatile bool ctrlc_pressed = false;
+static void handle_signal(int sig)
{
+ if (ctrlc_pressed)
+ exit(-1);
+ ctrlc_pressed = true;
+ signal(sig, &handle_signal);
+}
+
+sim_t::sim_t(const char* isa, size_t nprocs, size_t mem_mb, bool halted,
+ const std::vector<std::string>& args)
+ : htif_t(args), procs(std::max(nprocs, size_t(1))),
+ current_step(0), current_proc(0), debug(false), gdbserver(NULL)
+{
+ signal(SIGINT, &handle_signal);
// allocate target machine's memory, shrinking it as necessary
// until the allocation succeeds
size_t memsz0 = (size_t)mem_mb << 20;
size_t quantum = 1L << 20;
if (memsz0 == 0)
- memsz0 = 1L << (sizeof(size_t) == 8 ? 32 : 30);
+ memsz0 = (size_t)((sizeof(size_t) == 8 ? 4096 : 2048) - 256) << 20;
memsz = memsz0;
while ((mem = (char*)calloc(1, memsz)) == NULL)
- memsz = memsz*10/11/quantum*quantum;
+ memsz = (size_t)(memsz*0.9)/quantum*quantum;
+
+ if (memsz != memsz0)
+ fprintf(stderr, "warning: only got %zu bytes of target mem (wanted %zu)\n",
+ memsz, memsz0);
+
+ bus.add_device(DEBUG_START, &debug_module);
- if (memsz != memsz)
- fprintf(stderr, "warning: only got %lu bytes of target mem (wanted %lu)\n",
- (unsigned long)memsz, (unsigned long)memsz0);
+ debug_mmu = new mmu_t(this, NULL);
- mmu = new mmu_t(mem, memsz);
+ for (size_t i = 0; i < procs.size(); i++) {
+ procs[i] = new processor_t(isa, this, i, halted);
+ }
- if (_nprocs == 0)
- _nprocs = 1;
- for (size_t i = 0; i < _nprocs; i++)
- procs[i] = new processor_t(this, new mmu_t(mem, memsz), i);
+ rtc.reset(new rtc_t(procs));
+ make_dtb();
}
sim_t::~sim_t()
{
for (size_t i = 0; i < procs.size(); i++)
- {
- mmu_t* pmmu = &procs[i]->mmu;
delete procs[i];
- delete pmmu;
- }
- delete mmu;
+ delete debug_mmu;
free(mem);
}
-void sim_t::send_ipi(reg_t who)
+void sim_thread_main(void* arg)
{
- if (who < procs.size())
- procs[who]->deliver_ipi();
+ ((sim_t*)arg)->main();
}
-reg_t sim_t::get_scr(int which)
+void sim_t::main()
{
- switch (which)
- {
- case 0: return procs.size();
- case 1: return memsz >> 20;
- default: return -1;
- }
-}
+ if (!debug && log)
+ set_procs_debug(true);
-void sim_t::run()
-{
- while (!htif->done())
+ while (!done())
{
- if (debug)
+ if (debug || ctrlc_pressed)
interactive();
else
- step(INTERLEAVE, false);
+ step(INTERLEAVE);
+ if (gdbserver) {
+ gdbserver->handle();
+ }
}
}
-void sim_t::step(size_t n, bool noisy)
+int sim_t::run()
+{
+ host = context_t::current();
+ target.init(sim_thread_main, this);
+ return htif_t::run();
+}
+
+void sim_t::step(size_t n)
{
for (size_t i = 0, steps = 0; i < n; i += steps)
{
- htif->tick();
- if (!running())
- break;
-
steps = std::min(n - i, INTERLEAVE - current_step);
- procs[current_proc]->step(steps, noisy);
+ procs[current_proc]->step(steps);
current_step += steps;
if (current_step == INTERLEAVE)
{
current_step = 0;
- procs[current_proc]->mmu.yield_load_reservation();
- if (++current_proc == procs.size())
+ procs[current_proc]->yield_load_reservation();
+ if (++current_proc == procs.size()) {
current_proc = 0;
+ rtc->increment(INTERLEAVE / INSNS_PER_RTC_TICK);
+ }
+
+ host->switch_to();
}
}
}
-bool sim_t::running()
+void sim_t::set_debug(bool value)
+{
+ debug = value;
+}
+
+void sim_t::set_log(bool value)
+{
+ log = value;
+}
+
+void sim_t::set_histogram(bool value)
+{
+ histogram_enabled = value;
+ for (size_t i = 0; i < procs.size(); i++) {
+ procs[i]->set_histogram(histogram_enabled);
+ }
+}
+
+void sim_t::set_procs_debug(bool value)
+{
+ for (size_t i=0; i< procs.size(); i++)
+ procs[i]->set_debug(value);
+}
+
+bool sim_t::mmio_load(reg_t addr, size_t len, uint8_t* bytes)
+{
+ if (addr + len < addr)
+ return false;
+ return bus.load(addr, len, bytes);
+}
+
+bool sim_t::mmio_store(reg_t addr, size_t len, const uint8_t* bytes)
+{
+ if (addr + len < addr)
+ return false;
+ return bus.store(addr, len, bytes);
+}
+
+static std::string dts_compile(const std::string& dts)
{
+ // Convert the DTS to DTB
+ int dts_pipe[2];
+ pid_t dts_pid;
+
+ if (pipe(dts_pipe) != 0 || (dts_pid = fork()) < 0) {
+ std::cerr << "Failed to fork dts child: " << strerror(errno) << std::endl;
+ exit(1);
+ }
+
+ // Child process to output dts
+ if (dts_pid == 0) {
+ close(dts_pipe[0]);
+ int step, len = dts.length();
+ const char *buf = dts.c_str();
+ for (int done = 0; done < len; done += step) {
+ step = write(dts_pipe[1], buf+done, len-done);
+ if (step == -1) {
+ std::cerr << "Failed to write dts: " << strerror(errno) << std::endl;
+ exit(1);
+ }
+ }
+ close(dts_pipe[1]);
+ exit(0);
+ }
+
+ pid_t dtb_pid;
+ int dtb_pipe[2];
+ if (pipe(dtb_pipe) != 0 || (dtb_pid = fork()) < 0) {
+ std::cerr << "Failed to fork dtb child: " << strerror(errno) << std::endl;
+ exit(1);
+ }
+
+ // Child process to output dtb
+ if (dtb_pid == 0) {
+ dup2(dts_pipe[0], 0);
+ dup2(dtb_pipe[1], 1);
+ close(dts_pipe[0]);
+ close(dts_pipe[1]);
+ close(dtb_pipe[0]);
+ close(dtb_pipe[1]);
+ execl(DTC, DTC, "-O", "dtb", 0);
+ std::cerr << "Failed to run " DTC ": " << strerror(errno) << std::endl;
+ exit(1);
+ }
+
+ close(dts_pipe[1]);
+ close(dts_pipe[0]);
+ close(dtb_pipe[1]);
+
+ // Read-out dtb
+ std::stringstream dtb;
+
+ int got;
+ char buf[4096];
+ while ((got = read(dtb_pipe[0], buf, sizeof(buf))) > 0) {
+ dtb.write(buf, got);
+ }
+ if (got == -1) {
+ std::cerr << "Failed to read dtb: " << strerror(errno) << std::endl;
+ exit(1);
+ }
+ close(dtb_pipe[0]);
+
+ // Reap children
+ int status;
+ waitpid(dts_pid, &status, 0);
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ std::cerr << "Child dts process failed" << std::endl;
+ exit(1);
+ }
+ waitpid(dtb_pid, &status, 0);
+ if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
+ std::cerr << "Child dtb process failed" << std::endl;
+ exit(1);
+ }
+
+ return dtb.str();
+}
+
+void sim_t::make_dtb()
+{
+ reg_t rtc_addr = EXT_IO_BASE;
+ bus.add_device(rtc_addr, rtc.get());
+
+ const int align = 0x1000;
+ reg_t cpu_addr = rtc_addr + ((rtc->size() - 1) / align + 1) * align;
+ reg_t cpu_size = align;
+
+ uint32_t reset_vec[] = {
+ 0x297 + DRAM_BASE - DEFAULT_RSTVEC, // auipc t0, DRAM_BASE
+ 0x597, // auipc a1, 0
+ 0x58593, // addi a1, a1, 0
+ 0xf1402573, // csrr a0,mhartid
+ 0x00028067 // jalr zero, t0, 0 (jump straight to DRAM_BASE)
+ };
+ reset_vec[2] += (sizeof(reset_vec) - 4) << 20; // addi a1, a1, sizeof(reset_vec) - 4 = DTB start
+
+ std::vector<char> rom((char*)reset_vec, (char*)reset_vec + sizeof(reset_vec));
+
+ std::stringstream s;
+ s << std::dec <<
+ "/dts-v1/;\n"
+ "\n"
+ "/ {\n"
+ " #address-cells = <2>;\n"
+ " #size-cells = <2>;\n"
+ " compatible = \"ucbbar,spike-bare-dev\";\n"
+ " model = \"ucbbar,spike-bare\";\n"
+ " cpus {\n"
+ " #address-cells = <1>;\n"
+ " #size-cells = <0>;\n"
+ " timebase-frequency = <" << (CPU_HZ/INSNS_PER_RTC_TICK) << ">;\n";
+ for (size_t i = 0; i < procs.size(); i++) {
+ s << " CPU" << i << ": cpu@" << i << " {\n"
+ " device_type = \"cpu\";\n"
+ " reg = <" << i << ">;\n"
+ " status = \"okay\";\n"
+ " compatible = \"riscv\";\n"
+ " riscv,isa = \"" << procs[i]->isa_string << "\";\n"
+ " mmu-type = \"riscv," << (procs[i]->max_xlen <= 32 ? "sv32" : "sv48") << "\";\n"
+ " clock-frequency = <" << CPU_HZ << ">;\n"
+ " interrupt-controller;\n"
+ " #interrupt-cells = <1>;\n"
+ " };\n";
+ }
+ reg_t membs = DRAM_BASE;
+ s << std::hex <<
+ " };\n"
+ " memory@" << DRAM_BASE << " {\n"
+ " device_type = \"memory\";\n"
+ " reg = <0x" << (membs >> 32) << " 0x" << (membs & (uint32_t)-1) <<
+ " 0x" << (memsz >> 32) << " 0x" << (memsz & (uint32_t)-1) << ">;\n"
+ " };\n"
+ " soc {\n"
+ " #address-cells = <2>;\n"
+ " #size-cells = <2>;\n"
+ " compatible = \"ucbbar,spike-bare-soc\";\n"
+ " ranges;\n"
+ " clint@" << rtc_addr << " {\n"
+ " compatible = \"riscv,clint0\";\n"
+ " interrupts-extended = <" << std::dec;
for (size_t i = 0; i < procs.size(); i++)
- if (procs[i]->running())
- return true;
- return false;
+ s << "&CPU" << i << " 3 &CPU" << i << " 7 ";
+ s << std::hex << ">;\n"
+ " reg = <0x" << (rtc_addr >> 32) << " 0x" << (rtc_addr & (uint32_t)-1) <<
+ " 0x0 0x10000>;\n"
+ " };\n"
+ " };\n"
+ "};\n";
+
+ dts = s.str();
+ std::string dtb = dts_compile(dts);
+
+ rom.insert(rom.end(), dtb.begin(), dtb.end());
+ rom.resize((rom.size() / align + 1) * align);
+
+ boot_rom.reset(new rom_device_t(rom));
+ bus.add_device(DEFAULT_RSTVEC, boot_rom.get());
+}
+
+// htif
+
+void sim_t::idle()
+{
+ target.switch_to();
+}
+
+void sim_t::read_chunk(addr_t taddr, size_t len, void* dst)
+{
+ assert(len == 8);
+ auto data = debug_mmu->load_uint64(taddr);
+ memcpy(dst, &data, sizeof data);
}
-void sim_t::stop()
+void sim_t::write_chunk(addr_t taddr, size_t len, const void* src)
{
- procs[0]->tohost = 1;
- while (!htif->done())
- htif->tick();
+ assert(len == 8);
+ uint64_t data;
+ memcpy(&data, src, sizeof data);
+ debug_mmu->store_uint64(taddr, data);
}
projects / riscv-isa-sim.git / blobdiff