112 lines
3 KiB
C
112 lines
3 KiB
C
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/*
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* QEMU Host file guest access
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*
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* Copyright (c) 2020 Jonathan Afek <jonyafek@me.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "hw/arm/guest-services/file.h"
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#include "cpu.h"
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static int32_t file_fds[MAX_FILE_FDS] = { [0 ... MAX_FILE_FDS-1] = -1 };
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void qc_file_open(uint64_t index, const char *filename)
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{
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if (index >= MAX_FILE_FDS) {
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abort();
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}
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if (-1 != file_fds[index]) {
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abort();
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}
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file_fds[index] = open(filename, O_RDWR);
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if (-1 == file_fds[index]) {
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abort();
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}
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}
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int64_t qc_handle_write_file(CPUState *cpu, uint64_t buffer_guest_ptr,
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uint64_t length, uint64_t offset, uint64_t index)
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{
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uint8_t buf[MAX_FILE_TRANSACTION_LEN];
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if (index >= MAX_FILE_FDS) {
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abort();
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}
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int fd = file_fds[index];
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if (-1 == fd) {
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abort();
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}
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if (offset != lseek(fd, offset, SEEK_SET)) {
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abort();
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}
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if (length > MAX_FILE_TRANSACTION_LEN) {
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abort();
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}
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cpu_memory_rw_debug(cpu, buffer_guest_ptr, &buf[0], length, 0);
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if (length != write(fd, &buf[0], length)) {
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abort();
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}
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return 0;
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}
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int64_t qc_handle_read_file(CPUState *cpu, uint64_t buffer_guest_ptr,
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uint64_t length, uint64_t offset, uint64_t index)
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{
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uint8_t buf[MAX_FILE_TRANSACTION_LEN];
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if (index >= MAX_FILE_FDS) {
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abort();
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}
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int fd = file_fds[index];
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if (-1 == fd) {
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abort();
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}
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if (offset != lseek(fd, offset, SEEK_SET)) {
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abort();
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}
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if (length > MAX_FILE_TRANSACTION_LEN) {
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abort();
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}
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if (length != read(fd, &buf[0], length)) {
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abort();
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}
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cpu_memory_rw_debug(cpu, buffer_guest_ptr, &buf[0], length, 1);
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return 0;
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}
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int64_t qc_handle_size_file(uint64_t index)
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{
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struct stat st;
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if (index >= MAX_FILE_FDS) {
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abort();
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}
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int fd = file_fds[index];
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if (-1 == fd) {
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abort();
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}
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if (-1 == fstat(fd, &st)) {
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abort();
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}
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return st.st_size;
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}
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