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- /* Copyright (C) 2014 Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS 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 Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * db_misc.c
- *
- * This file contains APIs for miscellaneous use.
- */
- #include <asm/fcntl.h>
- #include <linux/time.h>
- #include "api.h"
- #include "pal.h"
- #include "pal_defs.h"
- #include "pal_error.h"
- #include "pal_internal.h"
- #include "pal_linux.h"
- #include "pal_linux_defs.h"
- #include "pal_security.h"
- int __gettimeofday(struct timeval* tv, struct timezone* tz);
- unsigned long _DkSystemTimeQueryEarly(void) {
- #if USE_CLOCK_GETTIME == 1
- struct timespec time;
- int ret;
- ret = INLINE_SYSCALL(clock_gettime, 2, CLOCK_REALTIME, &time);
- /* Come on, gettimeofday mostly never fails */
- if (IS_ERR(ret))
- return 0;
- /* in microseconds */
- return 1000000ULL * time.tv_sec + time.tv_nsec / 1000;
- #else
- struct timeval time;
- int ret;
- ret = INLINE_SYSCALL(gettimeofday, 2, &time, NULL);
- /* Come on, gettimeofday mostly never fails */
- if (IS_ERR(ret))
- return 0;
- /* in microseconds */
- return 1000000ULL * time.tv_sec + time.tv_usec;
- #endif
- }
- unsigned long _DkSystemTimeQuery(void) {
- #if USE_CLOCK_GETTIME == 1
- struct timespec time;
- int ret;
- #if USE_VDSO_GETTIME == 1
- if (linux_state.vdso_clock_gettime) {
- ret = linux_state.vdso_clock_gettime(CLOCK_REALTIME, &time);
- } else {
- #endif
- ret = INLINE_SYSCALL(clock_gettime, 2, CLOCK_REALTIME, &time);
- #if USE_VDSO_GETTIME == 1
- }
- #endif
- /* Come on, gettimeofday mostly never fails */
- if (IS_ERR(ret))
- return 0;
- /* in microseconds */
- return 1000000ULL * time.tv_sec + time.tv_nsec / 1000;
- #else
- struct timeval time;
- int ret;
- #if USE_VDSO_GETTIME == 1
- if (linux_state.vdso_gettimeofday) {
- ret = linux_state.vdso_gettimeofday(&time, NULL);
- } else {
- #endif
- #if USE_VSYSCALL_GETTIME == 1
- ret = __gettimeofday(&time, NULL);
- #else
- ret = INLINE_SYSCALL(gettimeofday, 2, &time, NULL);
- #endif
- #if USE_VDSO_GETTIME == 1
- }
- #endif
- /* Come on, gettimeofday mostly never fails */
- if (IS_ERR(ret))
- return 0;
- /* in microseconds */
- return 1000000ULL * time.tv_sec + time.tv_usec;
- #endif
- }
- #if USE_ARCH_RDRAND == 1
- int _DkRandomBitsRead(void* buffer, int size) {
- int total_bytes = 0;
- do {
- unsigned long rand;
- asm volatile(".Lretry: rdrand %%rax\r\n jnc .Lretry\r\n" : "=a"(rand)::"memory", "cc");
- if (total_bytes + sizeof(rand) <= size) {
- *(unsigned long*)(buffer + total_bytes) = rand;
- total_bytes += sizeof(rand);
- } else {
- for (int i = 0; i < size - total_bytes; i++)
- *(unsigned char*)(buffer + total_bytes + i) = ((unsigned char*)&rand)[i];
- total_bytes = size;
- }
- } while (total_bytes < size);
- return 0;
- }
- #else
- size_t _DkRandomBitsRead(void* buffer, size_t size) {
- if (!pal_sec.random_device) {
- int fd = INLINE_SYSCALL(open, 3, RANDGEN_DEVICE, O_RDONLY, 0);
- if (IS_ERR(fd))
- return -PAL_ERROR_DENIED;
- pal_sec.random_device = fd;
- }
- size_t total_bytes = 0;
- do {
- int bytes = INLINE_SYSCALL(read, 3, pal_sec.random_device, buffer + total_bytes,
- size - total_bytes);
- if (IS_ERR(bytes))
- return -PAL_ERROR_DENIED;
- total_bytes += (size_t)bytes;
- } while (total_bytes < size);
- return 0;
- }
- #endif
- #if defined(__i386__)
- #include <asm/ldt.h>
- #else
- #include <asm/prctl.h>
- #endif
- int _DkSegmentRegisterSet(int reg, const void* addr) {
- int ret = 0;
- #if defined(__i386__)
- struct user_desc u_info;
- ret = INLINE_SYSCALL(get_thread_area, 1, &u_info);
- if (IS_ERR(ret))
- return NULL;
- u_info->entry_number = -1;
- u_info->base_addr = (unsigned int)addr;
- ret = INLINE_SYSCALL(set_thread_area, 1, &u_info);
- #else
- if (reg == PAL_SEGMENT_FS) {
- ret = INLINE_SYSCALL(arch_prctl, 2, ARCH_SET_FS, addr);
- } else if (reg == PAL_SEGMENT_GS) {
- return -PAL_ERROR_DENIED;
- } else {
- return -PAL_ERROR_INVAL;
- }
- #endif
- if (IS_ERR(ret))
- return -PAL_ERROR_DENIED;
- return 0;
- }
- int _DkSegmentRegisterGet(int reg, void** addr) {
- int ret;
- #if defined(__i386__)
- struct user_desc u_info;
- ret = INLINE_SYSCALL(get_thread_area, 1, &u_info);
- if (IS_ERR(ret))
- return -PAL_ERROR_DENIED;
- *addr = (void*)u_info->base_addr;
- #else
- unsigned long ret_addr;
- if (reg == PAL_SEGMENT_FS) {
- ret = INLINE_SYSCALL(arch_prctl, 2, ARCH_GET_FS, &ret_addr);
- } else if (reg == PAL_SEGMENT_GS) {
- // The GS segment is used for the internal TCB of PAL
- return -PAL_ERROR_DENIED;
- } else {
- return -PAL_ERROR_INVAL;
- }
- if (IS_ERR(ret))
- return -PAL_ERROR_DENIED;
- *addr = (void*)ret_addr;
- #endif
- return 0;
- }
- int _DkInstructionCacheFlush(const void* addr, int size) {
- __UNUSED(addr);
- __UNUSED(size);
- return -PAL_ERROR_NOTIMPLEMENTED;
- }
- int _DkCpuIdRetrieve(unsigned int leaf, unsigned int subleaf, unsigned int values[4]) {
- cpuid(leaf, subleaf, values);
- return 0;
- }
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