mirrors/mkxp-z
1
0
Fork 0
mirror of https://github.com/mkxp-z/mkxp-z.git synced 2025-08-23 15:23:44 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions
mkxp-z/binding-sandbox/wasi.cpp
刘皓 3ba12e5672
Fix handling of big-endian platforms in libretro builds 
In big-endian libretro builds, the WebAssembly memory is reversed, so no
byte-swapping is required to read from/write to WebAssembly memory
(which is little-endian).

However, that means the ways to get and set values in WebAssembly memory
are endianness-dependent, so I've added the correct such ways for
big-endian platforms.
2025-05-10 18:55:14 -04:00

1023 lines
37 KiB
C++
Raw Blame History

/*
** wasi.cpp
**
** This file is part of mkxp.
**
** Copyright (C) 2013 - 2021 Amaryllis Kulla <ancurio@mapleshrine.eu>
**
** mkxp is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 2 of the License, or
** (at your option) any later version.
**
** mkxp is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with mkxp. If not, see <http://www.gnu.org/licenses/>.
*/
#include <cstring>
#include <algorithm>
#include <random>
#include <sstream>
#include <mkxp-sandbox-ruby.h>
#include "filesystem.h"
#include "core.h"
#include "wasi.h"
//#define WASI_DEBUG(...) mkxp_retro::log_printf(RETRO_LOG_INFO, __VA_ARGS__)
#define WASI_DEBUG(...)
#define WASM_MEM(address) ((void *)&wasi->ruby->w2c_memory.data[address])
static inline size_t strlen_safe(const char *str, size_t max_length) {
const char *ptr = (const char *)std::memchr(str, 0, max_length);
return ptr == nullptr ? max_length : ptr - str;
}
struct fs_dir *wasi_file_entry::dir_handle() {
return (struct fs_dir *)handle;
}
struct FileSystem::File *wasi_file_entry::file_handle() {
return (struct FileSystem::File *)handle;
}
wasi_t::w2c_wasi__snapshot__preview1(std::shared_ptr<struct w2c_ruby> ruby) : ruby(ruby) {
// Initialize WASI file descriptor table
fdtable.push_back({.type = wasi_fd_type::STDIN});
fdtable.push_back({.type = wasi_fd_type::STDOUT});
fdtable.push_back({.type = wasi_fd_type::STDERR});
fdtable.push_back({.type = wasi_fd_type::FS, .handle = new fs_dir {.root = nullptr, .path = std::string("/game"), .writable = true}});
fdtable.push_back({.type = wasi_fd_type::FS, .handle = new fs_dir {.root = nullptr, .path = std::string("/save"), .writable = true}});
fdtable.push_back({.type = wasi_fd_type::FS, .handle = new fs_dir {.root = nullptr, .path = std::string("/dist"), .writable = false}});
}
wasi_t::~w2c_wasi__snapshot__preview1() {
// Close all of the open WASI file descriptors
for (size_t i = fdtable.size(); i > 0;) {
deallocate_file_descriptor(--i);
}
}
struct fs_enumerate_data {
wasi_t *wasi;
u32 fd;
usize original_buf;
usize buf;
u32 buf_len;
u64 initial_cookie;
u64 cookie;
usize result;
};
u32 wasi_t::allocate_file_descriptor(enum wasi_fd_type type, void *handle) {
if (vacant_fds.empty()) {
u32 fd = fdtable.size();
fdtable.push_back({.type = type, .handle = handle});
return fd;
} else {
u32 fd = vacant_fds.back();
vacant_fds.pop_back();
return fd;
}
}
void wasi_t::deallocate_file_descriptor(u32 fd) {
if (fdtable[fd].handle != nullptr) {
switch (fdtable[fd].type) {
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
delete fdtable[fd].dir_handle();
break;
case wasi_fd_type::FSFILE:
delete fdtable[fd].file_handle();
break;
default:
break;
}
}
if (!fdtable.empty() && fd == fdtable.size() - 1) {
fdtable.pop_back();
} else {
fdtable[fd] = {.type = wasi_fd_type::VACANT, .handle = nullptr};
vacant_fds.push_back(fd);
}
}
extern "C" u32 w2c_wasi__snapshot__preview1_args_get(wasi_t *wasi, usize argv, usize argv_buf) {
WASI_DEBUG("args_get()\n");
return WASI_ESUCCESS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_args_sizes_get(wasi_t *wasi, usize argc, usize argv_buf_size) {
WASI_DEBUG("args_sizes_get(0x%08x, 0x%08x)\n", argc, argv_buf_size);
WASM_SET(u32, argc, 0);
WASM_SET(u32, argv_buf_size, 0);
return WASI_ESUCCESS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_clock_res_get(wasi_t *wasi, u32 id, usize result) {
WASI_DEBUG("clock_res_get(%u)\n", id);
WASM_SET(u64, result, 1000L);
return WASI_ESUCCESS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_clock_time_get(wasi_t *wasi, u32 id, u64 precision, usize result) {
WASI_DEBUG("clock_time_get(%u, %lu)\n", id, precision);
WASM_SET(u64, result, mkxp_retro::perf.get_time_usec != nullptr ? mkxp_retro::perf.get_time_usec() * 1000L : 0);
return WASI_ESUCCESS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_environ_get(wasi_t *wasi, usize env, usize env_buf) {
WASI_DEBUG("environ_get(0x%08x, 0x%08x)\n", env, env_buf);
return WASI_ESUCCESS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_environ_sizes_get(wasi_t *wasi, usize env_size, usize env_buf_size) {
WASI_DEBUG("environ_sizes_get()\n");
WASM_SET(u32, env_size, 0);
WASM_SET(u32, env_buf_size, 0);
return WASI_ESUCCESS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_advise(wasi_t *wasi, u32 fd, u64 offset, u64 len, u32 advice) {
WASI_DEBUG("fd_advise(%u, %lu, %lu, 0x%08x)\n", fd, offset, len, advice);
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_close(wasi_t *wasi, u32 fd) {
WASI_DEBUG("fd_close(%u)\n", fd);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
case wasi_fd_type::FSFILE:
wasi->deallocate_file_descriptor(fd);
return WASI_ESUCCESS;
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_datasync(wasi_t *wasi, u32 fd) {
WASI_DEBUG("fd_datasync(%u)\n", fd);
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_fdstat_get(wasi_t *wasi, u32 fd, usize result) {
WASI_DEBUG("fd_fdstat_get(%u)\n", fd);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FSFILE:
WASM_SET(u8, result, WASI_IFCHR); // fs_filetype
WASM_SET(u16, result + 2, 0); // fs_flags
WASM_SET(u64, result + 8, WASI_FD_READ | WASI_FD_WRITE | WASI_FD_FILESTAT_GET); // fs_rights_base
WASM_SET(u64, result + 16, 0); // fs_rights_inheriting
return WASI_ESUCCESS;
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
WASM_SET(u8, result, WASI_IFDIR); // fs_filetype
WASM_SET(u16, result + 2, 0); // fs_flags
WASM_SET(u64, result + 8, WASI_PATH_OPEN | WASI_FD_READDIR | WASI_PATH_FILESTAT_GET | WASI_FD_FILESTAT_GET); // fs_rights_base
WASM_SET(u64, result + 16, 0); // fs_rights_inheriting
return WASI_ESUCCESS;
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_fdstat_set_flags(wasi_t *wasi, u32 fd, u32 flags) {
WASI_DEBUG("fd_fdstat_set_flags(%u, %u)\n", fd, flags);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
case wasi_fd_type::FSFILE:
return WASI_ESUCCESS;
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_filestat_get(wasi_t *wasi, u32 fd, usize result) {
WASI_DEBUG("fd_filestat_get(%u)\n", fd);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
WASM_SET(u64, result, fd); // dev
WASM_SET(u64, result + 8, 0); // ino
WASM_SET(u8, result + 16, WASI_IFCHR); // filetype
WASM_SET(u32, result + 24, 1); // nlink
WASM_SET(u64, result + 32, 0); // size
WASM_SET(u64, result + 40, 0); // atim
WASM_SET(u64, result + 48, 0); // mtim
WASM_SET(u64, result + 56, 0); // ctim
return WASI_ESUCCESS;
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
{
PHYSFS_Stat stat;
if (!PHYSFS_stat(wasi->fdtable[fd].dir_handle()->path.c_str(), &stat)) {
return WASI_ENOENT;
}
if (stat.filetype != PHYSFS_FILETYPE_DIRECTORY) {
return WASI_EIO;
}
WASM_SET(u64, result, fd); // dev
WASM_SET(u64, result + 8, 0); // ino // TODO: generate a pseudorandom inode number
WASM_SET(u8, result + 16, WASI_IFDIR); // filetype
WASM_SET(u32, result + 24, 1); // nlink
WASM_SET(u64, result + 32, stat.filesize); // size
WASM_SET(u64, result + 40, stat.accesstime * 1000000000L); // atim
WASM_SET(u64, result + 48, stat.modtime * 1000000000L); // mtim
WASM_SET(u64, result + 56, stat.createtime * 1000000000L); // ctim
return WASI_ESUCCESS;
}
case wasi_fd_type::FSFILE:
{
PHYSFS_Stat stat;
if (!PHYSFS_stat(wasi->fdtable[fd].file_handle()->path(), &stat)) {
return WASI_ENOENT;
}
if (stat.filetype != PHYSFS_FILETYPE_REGULAR) {
return WASI_EIO;
}
WASM_SET(u64, result, fd); // dev
WASM_SET(u64, result + 8, 0); // ino // TODO: generate a pseudorandom inode number
WASM_SET(u8, result + 16, WASI_IFREG); // filetype
WASM_SET(u32, result + 24, 1); // nlink
WASM_SET(u64, result + 32, stat.filesize); // size
WASM_SET(u64, result + 40, stat.accesstime * 1000000000L); // atim
WASM_SET(u64, result + 48, stat.modtime * 1000000000L); // mtim
WASM_SET(u64, result + 56, stat.createtime * 1000000000L); // ctim
return WASI_ESUCCESS;
}
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_filestat_set_size(wasi_t *wasi, u32 fd, u64 size) {
WASI_DEBUG("fd_filestat_set_size(%u, %lu)\n", fd, size);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
return WASI_EINVAL;
default:
return WASI_ENOSYS;
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_pread(wasi_t *wasi, u32 fd, usize iovs, u32 iovs_len, u64 offset, usize result) {
WASI_DEBUG("fd_pread(%u, 0x%08x (%u), %lu)\n", fd, iovs, iovs_len, offset);
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_prestat_dir_name(wasi_t *wasi, u32 fd, usize path, u32 path_len) {
WASI_DEBUG("fd_prestat_dir_name(%u, 0x%x (%u))\n", fd, path, path_len);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::FS:
std::strncpy((char *)WASM_MEM(path), wasi->fdtable[fd].dir_handle()->path.c_str(), path_len);
return WASI_ESUCCESS;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FSDIR:
case wasi_fd_type::FSFILE:
return WASI_EINVAL;
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_prestat_get(wasi_t *wasi, u32 fd, usize result) {
WASI_DEBUG("fd_prestat_get(%u)\n", fd);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::FS:
WASM_SET(u32, result, 0);
WASM_SET(u32, result + 4, wasi->fdtable[fd].dir_handle()->path.length());
return WASI_ESUCCESS;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FSDIR:
case wasi_fd_type::FSFILE:
return WASI_EINVAL;
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_pwrite(wasi_t *wasi, u32 fd, usize iovs, u32 iovs_len, u64 offset, usize result) {
WASI_DEBUG("fd_pwrite(%u, 0x%08x (%u), %lu)\n", fd, iovs, iovs_len, offset);
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_read(wasi_t *wasi, u32 fd, usize iovs, u32 iovs_len, usize result) {
WASI_DEBUG("fd_read(%u, 0x%08x (%u))\n", fd, iovs, iovs_len);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
WASM_SET(u32, result, 0);
return WASI_ESUCCESS;
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
return WASI_EINVAL;
case wasi_fd_type::FSFILE:
{
u32 size = 0;
while (iovs_len > 0) {
PHYSFS_sint64 n = PHYSFS_readBytes(wasi->fdtable[fd].file_handle()->get(), WASM_MEM(WASM_GET(u32, iovs)), WASM_GET(u32, iovs + 4));
if (n < 0) return WASI_EIO;
size += n;
iovs += 8;
--iovs_len;
}
WASM_SET(u32, result, size);
return WASI_ESUCCESS;
}
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_readdir(wasi_t *wasi, u32 fd, usize buf, u32 buf_len, u64 cookie, usize result) {
WASI_DEBUG("fd_readdir(%u, 0x%08x (%u), %lu)\n", fd, buf, buf_len, cookie);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FSFILE:
return WASI_EINVAL;
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
{
struct fs_enumerate_data edata = {
.wasi = wasi,
.fd = fd,
.original_buf = buf,
.buf = buf,
.buf_len = buf_len,
.initial_cookie = cookie,
.cookie = 0,
.result = result,
};
bool success = PHYSFS_enumerate(
wasi->fdtable[fd].dir_handle()->path.c_str(),
[](void *data, const char *path, const char *filename) {
struct fs_enumerate_data *edata = (struct fs_enumerate_data *)data;
wasi_t *wasi = edata->wasi;
PHYSFS_Stat stat;
if (!PHYSFS_stat(edata->wasi->fdtable[edata->fd].dir_handle()->path.c_str(), &stat)) {
return PHYSFS_ENUM_OK;
}
if (stat.filetype != PHYSFS_FILETYPE_DIRECTORY && stat.filetype != PHYSFS_FILETYPE_REGULAR) {
return PHYSFS_ENUM_OK;
}
if (edata->cookie++ < edata->initial_cookie) {
return PHYSFS_ENUM_OK;
}
if (edata->buf - edata->original_buf + 8 > edata->buf_len) {
return PHYSFS_ENUM_STOP;
}
WASM_SET(u64, edata->buf, edata->cookie);
edata->buf += 8;
if (edata->buf - edata->original_buf + 8 > edata->buf_len) {
return PHYSFS_ENUM_STOP;
}
WASM_SET(u64, edata->buf, 0); // TODO: generate a pseudorandom inode number
edata->buf += 8;
if (edata->buf - edata->original_buf + 4 > edata->buf_len) {
return PHYSFS_ENUM_STOP;
}
WASM_SET(u32, edata->buf, std::strlen(filename));
edata->buf += 4;
if (edata->buf - edata->original_buf + 4 > edata->buf_len) {
return PHYSFS_ENUM_STOP;
}
WASM_SET(u8, edata->buf, stat.filetype);
edata->buf += 4;
u32 len = std::min(std::strlen(filename), (size_t)(edata->original_buf + edata->buf_len - edata->buf));
std::memcpy(WASM_MEM(edata->buf), filename, std::strlen(filename));
edata->buf += len;
return PHYSFS_ENUM_OK;
},
(void *)&edata
);
if (success) {
WASM_SET(u32, result, edata.buf - edata.original_buf);
return WASI_ESUCCESS;
}
return success ? WASI_ESUCCESS : WASI_ENOENT;
}
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_renumber(wasi_t *wasi, u32 fd, u32 to) {
WASI_DEBUG("fd_renumber(%u, %u)\n", fd, to);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FS:
return WASI_EINVAL;
case wasi_fd_type::FSDIR:
case wasi_fd_type::FSFILE:
break;
}
if (fd == to) {
return WASI_ESUCCESS;
}
if (to >= wasi->fdtable.size()) return WASI_EBADF;
switch (wasi->fdtable[to].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FS:
return WASI_EINVAL;
case wasi_fd_type::FSDIR:
case wasi_fd_type::FSFILE:
wasi->deallocate_file_descriptor(to);
if (to == wasi->fdtable.size()) {
wasi->fdtable.push_back(wasi->fdtable[fd]);
} else {
wasi->fdtable[to] = wasi->fdtable[fd];
}
if (!wasi->fdtable.empty() && fd == wasi->fdtable.size() - 1) {
wasi->fdtable.pop_back();
} else {
wasi->fdtable[fd] = {.type = wasi_fd_type::VACANT, .handle = nullptr};
wasi->vacant_fds.push_back(fd);
}
return WASI_ESUCCESS;
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_seek(wasi_t *wasi, u32 fd, u64 offset, u32 whence, usize result) {
WASI_DEBUG("fd_seek(%u, %lu, %u)\n", fd, offset, whence);
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_sync(wasi_t *wasi, u32 fd) {
WASI_DEBUG("fd_sync(%u)\n", fd);
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_tell(wasi_t *wasi, u32 fd, usize result) {
WASI_DEBUG("fd_tell(%u)\n", fd);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
return WASI_EINVAL;
case wasi_fd_type::FSFILE:
WASM_SET(u64, result, PHYSFS_tell(wasi->fdtable[fd].file_handle()->get()));
return WASI_ESUCCESS;
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_fd_write(wasi_t *wasi, u32 fd, usize iovs, u32 iovs_len, usize result) {
WASI_DEBUG("fd_write(%u, 0x%08x (%u))\n", fd, iovs, iovs_len);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
WASM_SET(u32, result, 0);
return WASI_ESUCCESS;
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
{
u32 size = 0;
std::string buf;
while (iovs_len > 0) {
buf.append((const char *)WASM_MEM(WASM_GET(u32, iovs)), strlen_safe((const char *)WASM_MEM(WASM_GET(u32, iovs)), WASM_GET(u32, iovs + 4)));
size += WASM_GET(u32, iovs + 4);
iovs += 8;
--iovs_len;
}
std::string line;
std::istringstream stream(buf);
while (std::getline(stream, line)) {
mkxp_retro::log_printf(wasi->fdtable[fd].type == wasi_fd_type::STDOUT ? RETRO_LOG_INFO : RETRO_LOG_ERROR, "%s\n", line.c_str());
}
WASM_SET(u32, result, size);
return WASI_ESUCCESS;
}
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
return WASI_EINVAL;
case wasi_fd_type::FSFILE:
{
if (!wasi->fdtable[fd].file_handle()->is_write_open()) {
return WASI_EROFS;
}
u32 size = 0;
while (iovs_len > 0) {
PHYSFS_sint64 n = PHYSFS_writeBytes(wasi->fdtable[fd].file_handle()->get_write(), WASM_MEM(WASM_GET(u32, iovs)), WASM_GET(u32, iovs + 4));
if (n >= 0) {
size += n;
}
iovs += 8;
--iovs_len;
}
WASM_SET(u32, result, size);
return WASI_ESUCCESS;
}
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_path_create_directory(wasi_t *wasi, u32 fd, usize path, u32 path_len) {
WASI_DEBUG("path_create_directory(%u, \"%.*s\")\n", fd, path_len, (char *)WASM_MEM(path));
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_path_filestat_get(wasi_t *wasi, u32 fd, u32 flags, usize path, u32 path_len, usize result) {
WASI_DEBUG("path_filestat_get(%u, %u, \"%.*s\")\n", fd, flags, path_len, (char *)WASM_MEM(path));
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FSFILE:
return WASI_EINVAL;
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
{
PHYSFS_Stat stat;
std::string new_path(wasi->fdtable[fd].dir_handle()->path);
new_path.push_back('/');
new_path.append((const char *)WASM_MEM(path), strlen_safe((const char *)WASM_MEM(path), path_len));
new_path = mkxp_retro::fs->normalize(new_path.c_str(), false, true);
if (std::strncmp(new_path.c_str(), wasi->fdtable[fd].dir_handle()->path.c_str(), wasi->fdtable[fd].dir_handle()->path.length()) != 0) {
return WASI_EPERM;
}
if (!PHYSFS_stat(new_path.c_str(), &stat)) {
return WASI_ENOENT;
}
if (stat.filetype != PHYSFS_FILETYPE_DIRECTORY && stat.filetype != PHYSFS_FILETYPE_REGULAR) {
return WASI_EIO;
}
WASM_SET(u64, result, fd); // dev
WASM_SET(u64, result + 8, 0); // ino // TODO: generate a pseudorandom inode number
WASM_SET(u8, result + 16, stat.filetype == PHYSFS_FILETYPE_DIRECTORY ? WASI_IFDIR : WASI_IFREG); // filetype
WASM_SET(u32, result + 24, 1); // nlink
WASM_SET(u64, result + 32, stat.filetype); // size
WASM_SET(u64, result + 40, stat.accesstime * 1000000000L); // atim
WASM_SET(u64, result + 48, stat.modtime * 1000000000L); // mtim
WASM_SET(u64, result + 56, stat.createtime * 1000000000L); // ctim
return WASI_ESUCCESS;
}
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_path_filestat_set_times(wasi_t *wasi, u32 fd, u32 flags, usize path, u32 path_len, u64 atim, u64 ntim, u32 fst_flags) {
WASI_DEBUG("path_filestat_set_times(%u, %u, \"%.*s\", %lu, %lu, %u)\n", fd, flags, path_len, (char *)WASM_MEM(path), atim, ntim, fst_flags);
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_path_link(wasi_t *wasi, u32 old_fd, u32 old_flags, usize old_path, u32 old_path_len, u32 new_fd, usize new_path, u32 new_path_len) {
WASI_DEBUG("path_link(%u, %u, \"%.*s\", %u, \"%.*s\")\n", old_fd, old_flags, old_path_len, (char *)WASM_MEM(old_path), new_fd, new_path_len, (char *)WASM_MEM(new_path));
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_path_open(wasi_t *wasi, u32 fd, u32 dirflags, usize path, u32 path_len, u32 oflags, u64 fs_base_rights, u64 fs_rights_inheriting, u32 fdflags, usize result) {
WASI_DEBUG("path_open(%u, %u, \"%.*s\", %u, %lu, %lu, %u)\n", fd, dirflags, path_len, (char *)WASM_MEM(path), oflags, fs_base_rights, fs_rights_inheriting, fdflags);
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FSFILE:
return WASI_EINVAL;
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
{
PHYSFS_Stat stat;
std::string new_path(wasi->fdtable[fd].dir_handle()->path);
new_path.push_back('/');
new_path.append((const char *)WASM_MEM(path), strlen_safe((const char *)WASM_MEM(path), path_len));
new_path = mkxp_retro::fs->normalize(new_path.c_str(), false, true);
// Verify that the path we're opening is a descendant of the directory corresponding to `fd`
if (std::strncmp(new_path.c_str(), wasi->fdtable[fd].dir_handle()->path.c_str(), wasi->fdtable[fd].dir_handle()->path.length()) != 0) {
return WASI_EPERM;
}
bool exists = PHYSFS_stat(new_path.c_str(), &stat);
// Fail if bit 0 of oflags isn't set and the path doesn't exist
if (!exists && !(oflags & (1 << 0))) {
return WASI_ENOENT;
}
// Fail if bit 1 of oflags is set and the path exists and isn't a directory
if (exists && oflags & (1 << 1) && stat.filetype != PHYSFS_FILETYPE_DIRECTORY) {
return WASI_ENOTDIR;
}
// Fail if bit 2 of oflags is set and the path exists
if (exists && oflags & (1 << 2)) {
return WASI_EEXIST;
}
// Fail if the path exists and isn't a regular file or directory (e.g. a device file, named pipe, socket or symbolic link)
if (exists && (stat.filetype != PHYSFS_FILETYPE_DIRECTORY && stat.filetype != PHYSFS_FILETYPE_REGULAR)) {
return WASI_EIO;
}
bool truncate = oflags & (1 << 3);
bool needs_write = !exists || truncate;
bool writable = wasi->fdtable[fd].dir_handle()->writable;
// Fail if we need to create a new file or truncate a file in a read-only file system
if (needs_write && !writable && oflags & (1 << 0)) {
return WASI_EROFS;
}
if (exists && stat.filetype == PHYSFS_FILETYPE_DIRECTORY) {
struct fs_dir *root = wasi->fdtable[fd].dir_handle()->root != nullptr ? wasi->fdtable[fd].dir_handle()->root : wasi->fdtable[fd].dir_handle();
struct fs_dir *handle = new fs_dir {.root = root, .path = new_path, .writable = writable};
WASM_SET(u32, result, wasi->allocate_file_descriptor(wasi_fd_type::FSDIR, handle));
} else {
const char *write_path_prefix;
if (writable) {
struct fs_dir *root = wasi->fdtable[fd].dir_handle()->root != nullptr ? wasi->fdtable[fd].dir_handle()->root : wasi->fdtable[fd].dir_handle();
write_path_prefix = root->path.c_str();
} else {
write_path_prefix = nullptr;
}
struct FileSystem::File *handle = new FileSystem::File(*mkxp_retro::fs, new_path.c_str(), write_path_prefix, truncate, exists);
// Check for errors opening the read handle and/or write handle
if (!handle->is_open() || (needs_write && writable && !handle->is_write_open())) {
PHYSFS_ErrorCode error = handle->get_read_error();
if (error == handle->get_read_error()) {
error = handle->get_write_error();
}
delete handle;
switch (error) {
case PHYSFS_ERR_READ_ONLY:
case PHYSFS_ERR_NO_WRITE_DIR:
return WASI_EROFS;
case PHYSFS_ERR_PERMISSION:
return WASI_EACCES;
default:
return WASI_EIO;
}
}
WASM_SET(u32, result, wasi->allocate_file_descriptor(wasi_fd_type::FSFILE, handle));
}
return WASI_ESUCCESS;
}
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_path_readlink(wasi_t *wasi, u32 fd, usize path, u32 path_len, usize buf, u32 buf_len, usize result) {
WASI_DEBUG("path_readlink(%u, \"%.*s\", 0x%08x (%u))\n", fd, path_len, (char *)WASM_MEM(path), buf, buf_len);
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_path_remove_directory(wasi_t *wasi, u32 fd, usize path, u32 path_len) {
WASI_DEBUG("path_remove_directory(%u, \"%.*s\")\n", fd, path_len, (char *)WASM_MEM(path));
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FSFILE:
return WASI_EINVAL;
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
{
if (!wasi->fdtable[fd].dir_handle()->writable) {
return WASI_EROFS;
}
PHYSFS_Stat stat;
std::string new_path(wasi->fdtable[fd].dir_handle()->path);
new_path.push_back('/');
new_path.append((const char *)WASM_MEM(path), strlen_safe((const char *)WASM_MEM(path), path_len));
new_path = mkxp_retro::fs->normalize(new_path.c_str(), false, true);
// Verify that the path we're opening is a descendant of the directory corresponding to `fd`
if (std::strncmp(new_path.c_str(), wasi->fdtable[fd].dir_handle()->path.c_str(), wasi->fdtable[fd].dir_handle()->path.length()) != 0) {
return WASI_EPERM;
}
if (!PHYSFS_stat(wasi->fdtable[fd].dir_handle()->path.c_str(), &stat)) {
return WASI_ENOENT;
}
if (stat.filetype != PHYSFS_FILETYPE_DIRECTORY) {
return WASI_ENOTDIR;
}
struct fs_dir *root = wasi->fdtable[fd].dir_handle()->root != nullptr ? wasi->fdtable[fd].dir_handle()->root : wasi->fdtable[fd].dir_handle();
if (!PHYSFS_delete(new_path.c_str() + root->path.length())) {
switch (PHYSFS_getLastErrorCode()) {
case PHYSFS_ERR_DIR_NOT_EMPTY:
return WASI_ENOTEMPTY;
case PHYSFS_ERR_READ_ONLY:
case PHYSFS_ERR_NO_WRITE_DIR:
return WASI_EROFS;
case PHYSFS_ERR_PERMISSION:
return WASI_EACCES;
default:
return WASI_EIO;
}
}
return WASI_ESUCCESS;
}
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_path_rename(wasi_t *wasi, u32 fd, usize old_path, u32 old_path_len, u32 new_fd, usize new_path, u32 new_path_len) {
WASI_DEBUG("path_rename(%u, \"%.*s\", %u, \"%.*s\")\n", fd, old_path_len, (char *)WASM_MEM(old_path), new_fd, new_path_len, (char *)WASM_MEM(new_path));
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_path_symlink(wasi_t *wasi, usize old_path, u32 old_path_len, u32 fd, usize new_path, u32 new_path_len) {
WASI_DEBUG("path_symlink(\"%.*s\", %u, \"%.*s\")\n", old_path_len, (char *)WASM_MEM(old_path), fd, new_path_len, (char *)WASM_MEM(new_path));
return WASI_ENOSYS;
}
extern "C" u32 w2c_wasi__snapshot__preview1_path_unlink_file(wasi_t *wasi, u32 fd, usize path, u32 path_len) {
WASI_DEBUG("path_unlink_file(%u, \"%.*s\")\n", fd, path_len, (char *)WASM_MEM(path));
if (fd >= wasi->fdtable.size()) {
return WASI_EBADF;
}
switch (wasi->fdtable[fd].type) {
case wasi_fd_type::VACANT:
return WASI_EBADF;
case wasi_fd_type::STDIN:
case wasi_fd_type::STDOUT:
case wasi_fd_type::STDERR:
case wasi_fd_type::FSFILE:
return WASI_EINVAL;
case wasi_fd_type::FS:
case wasi_fd_type::FSDIR:
{
if (!wasi->fdtable[fd].dir_handle()->writable) {
return WASI_EROFS;
}
PHYSFS_Stat stat;
std::string new_path(wasi->fdtable[fd].dir_handle()->path);
new_path.push_back('/');
new_path.append((const char *)WASM_MEM(path), strlen_safe((const char *)WASM_MEM(path), path_len));
new_path = mkxp_retro::fs->normalize(new_path.c_str(), false, true);
// Verify that the path we're opening is a descendant of the directory corresponding to `fd`
if (std::strncmp(new_path.c_str(), wasi->fdtable[fd].dir_handle()->path.c_str(), wasi->fdtable[fd].dir_handle()->path.length()) != 0) {
return WASI_EPERM;
}
if (!PHYSFS_stat(wasi->fdtable[fd].dir_handle()->path.c_str(), &stat)) {
return WASI_ENOENT;
}
if (stat.filetype == PHYSFS_FILETYPE_DIRECTORY) {
return WASI_EISDIR;
} else if (stat.filetype != PHYSFS_FILETYPE_REGULAR) {
return WASI_EIO;
}
struct fs_dir *root = wasi->fdtable[fd].dir_handle()->root != nullptr ? wasi->fdtable[fd].dir_handle()->root : wasi->fdtable[fd].dir_handle();
if (!PHYSFS_delete(new_path.c_str() + root->path.length())) {
switch (PHYSFS_getLastErrorCode()) {
case PHYSFS_ERR_READ_ONLY:
case PHYSFS_ERR_NO_WRITE_DIR:
return WASI_EROFS;
case PHYSFS_ERR_PERMISSION:
return WASI_EACCES;
default:
return WASI_EIO;
}
}
return WASI_ESUCCESS;
}
}
return WASI_EBADF;
}
extern "C" u32 w2c_wasi__snapshot__preview1_poll_oneoff(wasi_t *wasi, usize in, usize out, u32 nsubscriptions, usize result) {
WASI_DEBUG("poll_oneoff(0x%08x, 0x%08x, %u)\n", in, out, nsubscriptions);
return WASI_ENOSYS;
}
extern "C" void w2c_wasi__snapshot__preview1_proc_exit(wasi_t *wasi, u32 rval) {
WASI_DEBUG("proc_exit(%u)\n", rval);
std::abort();
}
extern "C" u32 w2c_wasi__snapshot__preview1_random_get(wasi_t *wasi, usize buf, u32 buf_len) {
WASI_DEBUG("random_get(0x%08x (%u))\n", buf, buf_len);
static std::random_device dev;
static std::mt19937 rng(dev());
static u32 rng_buffer;
static u32 rng_buffer_size = 0;
while (buf_len > 0) {
if (rng_buffer_size == 0) {
rng_buffer = rng();
rng_buffer_size = 4;
} else {
u32 n = std::min(rng_buffer_size, buf_len);
std::memcpy(WASM_MEM(buf), (u8 *)&rng_buffer + (4 - n), n);
buf += n;
buf_len -= n;
rng_buffer_size -= n;
}
}
return WASI_ESUCCESS;
}
Reference in a new issue View git blame Copy permalink