297 lines
10 KiB
C++
297 lines
10 KiB
C++
#include "semihosting.h"
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#include <cstdint>
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#include <map>
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#include <iss/vm_types.h>
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#include <stdexcept>
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#include <chrono>
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// explanation of syscalls can be found at https://github.com/SpinalHDL/openocd_riscv/blob/riscv_spinal/src/target/semihosting_common.h
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const char *SYS_OPEN_MODES_STRS[] = { "r", "rb", "r+", "r+b", "w", "wb", "w+", "w+b", "a", "ab", "a+", "a+b" };
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template <typename T> T sh_read_field(iss::arch_if* arch_if_ptr, T addr, int len=4) {
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uint8_t bytes[4];
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auto res = arch_if_ptr->read(iss::address_type::PHYSICAL, iss::access_type::DEBUG_READ, 0, addr, 4, &bytes[0]);
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//auto res = arch_if_ptr->read(iss::address_type::PHYSICAL, iss::access_type::DEBUG_READ, 0, *parameter, 1, &character);
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if(res != iss::Ok){
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return 0; //TODO THROW ERROR
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} else return static_cast<T>(bytes[0]) | (static_cast<T>(bytes[1]) << 8) | (static_cast<T>(bytes[2]) << 16) | (static_cast<T>(bytes[3]) << 24);
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}
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template <typename T> std::string sh_read_string(iss::arch_if* arch_if_ptr, T addr, T str_len){
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std::vector<uint8_t> buffer(str_len);
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for (int i = 0; i < str_len; i++ ) {
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buffer[i] = sh_read_field(arch_if_ptr, addr + i, 1);
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}
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std::string str(buffer.begin(), buffer.end());
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return str;
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}
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template <typename T> void semihosting_callback<T>::operator()(iss::arch_if* arch_if_ptr, T* call_number, T* parameter) {
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static std::map<T, FILE *> openFiles;
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static T file_count = 3;
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static T semihostingErrno;
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switch(static_cast<semihosting_syscalls>(*call_number)) {
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case semihosting_syscalls::SYS_CLOCK: {
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auto end = std::chrono::high_resolution_clock::now(); // end measurement
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auto elapsed = end - timeVar;
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auto millis = std::chrono::duration_cast<std::chrono::milliseconds>(elapsed).count();
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*call_number = millis; //TODO get time now
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break;
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}
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case semihosting_syscalls::SYS_CLOSE: {
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T file_handle = *parameter;
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if (openFiles.size() <= file_handle && file_handle < 0) {
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semihostingErrno = EBADF;
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return;
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}
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auto file = openFiles[file_handle];
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openFiles.erase(file_handle);
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if (!(file == stdin || file == stdout || file == stderr)) {
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int i = fclose(file);
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*call_number = i;
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} else {
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*call_number = -1;
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semihostingErrno = EINTR;
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}
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break;
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}
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case semihosting_syscalls::SYS_ELAPSED: {
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throw std::runtime_error("Semihosting Call not Implemented");
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break;
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}
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case semihosting_syscalls::SYS_ERRNO: {
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*call_number = semihostingErrno;
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break;
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}
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case semihosting_syscalls::SYS_EXIT: {
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throw std::runtime_error("ISS terminated by Semihost: SYS_EXIT");
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break;
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}
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case semihosting_syscalls::SYS_EXIT_EXTENDED: {
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throw std::runtime_error("ISS terminated by Semihost: SYS_EXIT_EXTENDED");
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break;
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}
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case semihosting_syscalls::SYS_FLEN: {
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T file_handle = *parameter;
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auto file = openFiles[file_handle];
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size_t currentPos = ftell(file);
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if (currentPos < 0) throw std::runtime_error("SYS_FLEN negative value");
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fseek(file, 0, SEEK_END);
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size_t length = ftell(file);
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fseek(file, currentPos, SEEK_SET);
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*call_number = (T)length;
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break;
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}
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case semihosting_syscalls::SYS_GET_CMDLINE: {
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throw std::runtime_error("Semihosting Call not Implemented");
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break;
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}
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case semihosting_syscalls::SYS_HEAPINFO: {
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throw std::runtime_error("Semihosting Call not Implemented");
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break;
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}
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case semihosting_syscalls::SYS_ISERROR: {
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T value = *parameter;
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*call_number = (value != 0);
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break;
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}
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case semihosting_syscalls::SYS_ISTTY: {
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T file_handle = *parameter;
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*call_number = (file_handle == 0 || file_handle == 1 || file_handle == 2);
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break;
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}
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case semihosting_syscalls::SYS_OPEN: {
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T path_str_addr = sh_read_field<T>(arch_if_ptr, *parameter);
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T mode = sh_read_field<T>(arch_if_ptr, 4+(*parameter));
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T path_len = sh_read_field<T>(arch_if_ptr, 8+(*parameter));
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std::string path_str = sh_read_string<T>(arch_if_ptr, path_str_addr, path_len);
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//TODO LOG INFO
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if (mode >= 12) {
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//TODO throw ERROR
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return;
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}
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FILE *file = nullptr;
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if(path_str == ":tt") {
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if (mode < 4)
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file = stdin;
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else if (mode < 8)
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file = stdout;
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else
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file = stderr;
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} else {
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file = fopen(path_str.c_str(), SYS_OPEN_MODES_STRS[mode]);
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if (file == nullptr) {
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//TODO throw error
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return;
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}
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}
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T file_handle = file_count++;
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openFiles[file_handle] = file;
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*call_number = file_handle;
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break;
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}
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case semihosting_syscalls::SYS_READ: {
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T file_handle = sh_read_field<T>(arch_if_ptr, (*parameter)+4);
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T addr = sh_read_field<T>(arch_if_ptr, *parameter);
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T count = sh_read_field<T>(arch_if_ptr, (*parameter)+8);
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auto file = openFiles[file_handle];
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std::vector<uint8_t> buffer(count);
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size_t num_read = 0;
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if (file == stdin)
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{
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// when reading from stdin: mimic behaviour from read syscall
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// and return on newline.
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while (num_read < count)
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{
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char c = fgetc(file);
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buffer[num_read] = c;
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num_read++;
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if (c == '\n')
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break;
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}
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} else {
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num_read = fread(buffer.data(), 1, count, file);
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}
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buffer.resize(num_read);
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for(int i = 0; i<num_read; i++) {
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auto res = arch_if_ptr->write(iss::address_type::PHYSICAL, iss::access_type::DEBUG_READ, 0, addr+i, 1, &buffer[i]);
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if(res != iss::Ok)
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return;
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}
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*call_number = count - num_read;
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break;
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}
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case semihosting_syscalls::SYS_READC: {
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uint8_t character = getchar();
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//character = getchar();
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/*if(character != iss::Ok)
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std::cout << "Not OK";
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return;*/
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*call_number = character;
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break;
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}
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case semihosting_syscalls::SYS_REMOVE: {
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T path_str_addr = sh_read_field<T>(arch_if_ptr, *parameter);
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T path_len = sh_read_field<T>(arch_if_ptr, (*parameter)+4);
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std::string path_str = sh_read_string<T>(arch_if_ptr, path_str_addr, path_len);
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if(remove(path_str.c_str())<0) *call_number = -1;
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break;
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}
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case semihosting_syscalls::SYS_RENAME: {
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T path_str_addr_old = sh_read_field<T>(arch_if_ptr, *parameter);
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T path_len_old = sh_read_field<T>(arch_if_ptr, (*parameter)+4);
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T path_str_addr_new = sh_read_field<T>(arch_if_ptr, (*parameter)+8);
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T path_len_new = sh_read_field<T>(arch_if_ptr, (*parameter)+12);
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std::string path_str_old = sh_read_string<T>(arch_if_ptr, path_str_addr_old, path_len_old);
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std::string path_str_new = sh_read_string<T>(arch_if_ptr, path_str_addr_new, path_len_new);
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rename(path_str_old.c_str(), path_str_new.c_str());
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break;
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}
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case semihosting_syscalls::SYS_SEEK: {
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T file_handle = sh_read_field<T>(arch_if_ptr, *parameter);
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T pos = sh_read_field<T>(arch_if_ptr, (*parameter)+1);
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auto file = openFiles[file_handle];
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int retval = fseek(file, pos, SEEK_SET);
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if(retval<0) throw std::runtime_error("SYS_SEEK negative return value");
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break;
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}
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case semihosting_syscalls::SYS_SYSTEM: {
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T cmd_addr = sh_read_field<T>(arch_if_ptr, *parameter);
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T cmd_len = sh_read_field<T>(arch_if_ptr, (*parameter)+1);
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std::string cmd = sh_read_string<T>(arch_if_ptr, cmd_addr, cmd_len);
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system(cmd.c_str());
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break;
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}
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case semihosting_syscalls::SYS_TICKFREQ: {
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throw std::runtime_error("Semihosting Call not Implemented");
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break;
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}
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case semihosting_syscalls::SYS_TIME: {
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//returns time in seconds scince 01.01.1970 00:00
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*call_number = time(NULL);
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break;
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}
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case semihosting_syscalls::SYS_TMPNAM: {
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T buffer_addr = sh_read_field<T>(arch_if_ptr, *parameter);
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T identifier = sh_read_field<T>(arch_if_ptr, (*parameter)+1);
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T buffer_len = sh_read_field<T>(arch_if_ptr, (*parameter)+2);
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if (identifier > 255) {
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*call_number = -1;
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return;
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}
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std::stringstream ss;
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ss << "tmp/file-" << std::setfill('0') << std::setw(3) << identifier;
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std::string filename = ss.str();
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for(int i = 0; i < buffer_len; i++) {
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uint8_t character = filename[i];
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auto res = arch_if_ptr->write(iss::address_type::PHYSICAL, iss::access_type::DEBUG_READ, 0, (*parameter)+i, 1, &character);
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if(res != iss::Ok) return;
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}
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break;
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}
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case semihosting_syscalls::SYS_WRITE: {
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T file_handle = sh_read_field<T>(arch_if_ptr, (*parameter)+4);
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T addr = sh_read_field<T>(arch_if_ptr, *parameter);
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T count = sh_read_field<T>(arch_if_ptr, (*parameter)+8);
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auto file = openFiles[file_handle];
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std::string str = sh_read_string<T>(arch_if_ptr, addr, count);
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fwrite(&str[0], 1, count, file);
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break;
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}
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case semihosting_syscalls::SYS_WRITEC: {
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uint8_t character;
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auto res = arch_if_ptr->read(iss::address_type::PHYSICAL, iss::access_type::DEBUG_READ, 0, *parameter, 1, &character);
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if(res != iss::Ok)
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return;
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putchar(character);
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break;
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}
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case semihosting_syscalls::SYS_WRITE0: {
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uint8_t character;
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while(1) {
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auto res = arch_if_ptr->read(iss::address_type::PHYSICAL, iss::access_type::DEBUG_READ, 0, *parameter, 1, &character);
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if(res != iss::Ok)
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return;
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if(character == 0)
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break;
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putchar(character);
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(*parameter)++;
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}
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break;
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}
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case semihosting_syscalls::USER_CMD_0x100: {
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throw std::runtime_error("Semihosting Call not Implemented");
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break;
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}
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case semihosting_syscalls::USER_CMD_0x1FF: {
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throw std::runtime_error("Semihosting Call not Implemented");
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break;
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}
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default:
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throw std::runtime_error("Semihosting Call not Implemented");
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break;
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}
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}
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template class semihosting_callback<uint32_t>;
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template class semihosting_callback<uint64_t>;
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