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// See LICENSE for license details.
#include "syscall.h"
#include "pk.h"
#include "file.h"
#include "frontend.h"
#include "vm.h"
#include <string.h>
#include <errno.h>
typedef long (*syscall_t)(long, long, long, long, long, long, long);
#define CLOCK_FREQ 1000000000
void sys_exit(int code)
{
if (current.t0)
printk("%ld cycles\n", rdcycle() - current.t0);
if (uarch_counters_enabled) {
size_t i = 0;
#define READ_CTR_FINI(name) do { \
while (i >= NUM_COUNTERS) ; \
long csr = read_csr(name); \
csr -= uarch_counters[i]; uarch_counter_names[i] = #name; \
uarch_counters[i++] = csr; \
} while (0)
READ_CTR_FINI(cycle); READ_CTR_FINI(instret);
READ_CTR_FINI(uarch0); READ_CTR_FINI(uarch1); READ_CTR_FINI(uarch2);
READ_CTR_FINI(uarch3); READ_CTR_FINI(uarch4); READ_CTR_FINI(uarch5);
READ_CTR_FINI(uarch6); READ_CTR_FINI(uarch7); READ_CTR_FINI(uarch8);
READ_CTR_FINI(uarch9); READ_CTR_FINI(uarch10); READ_CTR_FINI(uarch11);
READ_CTR_FINI(uarch12); READ_CTR_FINI(uarch13); READ_CTR_FINI(uarch14);
READ_CTR_FINI(uarch15);
#undef READ_CTR_FINI
for (int i = 0; i < NUM_COUNTERS; i++) {
if (uarch_counters[i]) {
printk("%s = %ld\n", uarch_counter_names[i], uarch_counters[i]);
}
}
}
die(code);
}
ssize_t sys_read(int fd, char* buf, size_t n)
{
ssize_t r = -EBADF;
file_t* f = file_get(fd);
if (f)
{
r = file_read(f, buf, n);
file_decref(f);
}
return r;
}
ssize_t sys_pread(int fd, char* buf, size_t n, off_t offset)
{
ssize_t r = -EBADF;
file_t* f = file_get(fd);
if (f)
{
r = file_pread(f, buf, n, offset);
file_decref(f);
}
return r;
}
ssize_t sys_write(int fd, const char* buf, size_t n)
{
ssize_t r = -EBADF;
file_t* f = file_get(fd);
if (f)
{
r = file_write(f, buf, n);
file_decref(f);
}
return r;
}
static int at_kfd(int dirfd)
{
if (dirfd == AT_FDCWD)
return AT_FDCWD;
file_t* dir = file_get(dirfd);
if (dir == NULL)
return -1;
return dir->kfd;
}
int sys_openat(int dirfd, const char* name, int flags, int mode)
{
int kfd = at_kfd(dirfd);
if (kfd != -1) {
file_t* file = file_openat(kfd, name, flags, mode);
if (IS_ERR_VALUE(file))
return PTR_ERR(file);
int fd = file_dup(file);
if (fd < 0) {
file_decref(file);
return -ENOMEM;
}
return fd;
}
return -EBADF;
}
int sys_open(const char* name, int flags, int mode)
{
return sys_openat(AT_FDCWD, name, flags, mode);
}
int sys_close(int fd)
{
int ret = fd_close(fd);
if (ret < 0)
return -EBADF;
return ret;
}
int sys_renameat(int old_fd, const char *old_path, int new_fd, const char *new_path) {
int old_kfd = at_kfd(old_fd);
int new_kfd = at_kfd(new_fd);
if(old_kfd != -1 && new_kfd != -1) {
size_t old_size = strlen(old_path)+1;
size_t new_size = strlen(new_path)+1;
return frontend_syscall(SYS_renameat, old_kfd, (uintptr_t)old_path, old_size,
new_kfd, (uintptr_t)new_path, new_size, 0);
}
return -EBADF;
}
int sys_fstat(int fd, void* st)
{
int r = -EBADF;
file_t* f = file_get(fd);
if (f)
{
r = file_stat(f, st);
file_decref(f);
}
return r;
}
int sys_fcntl(int fd, int cmd, int arg)
{
int r = -EBADF;
file_t* f = file_get(fd);
if (f)
{
r = frontend_syscall(SYS_fcntl, f->kfd, cmd, arg, 0, 0, 0, 0);
file_decref(f);
}
return r;
}
int sys_ftruncate(int fd, off_t len)
{
int r = -EBADF;
file_t* f = file_get(fd);
if (f)
{
r = file_truncate(f, len);
file_decref(f);
}
return r;
}
int sys_dup(int fd)
{
int r = -EBADF;
file_t* f = file_get(fd);
if (f)
{
r = file_dup(f);
file_decref(f);
}
return r;
}
ssize_t sys_lseek(int fd, size_t ptr, int dir)
{
ssize_t r = -EBADF;
file_t* f = file_get(fd);
if (f)
{
r = file_lseek(f, ptr, dir);
file_decref(f);
}
return r;
}
long sys_lstat(const char* name, void* st)
{
size_t name_size = strlen(name)+1;
populate_mapping(st, sizeof(struct stat), PROT_WRITE);
return frontend_syscall(SYS_lstat, (uintptr_t)name, name_size, (uintptr_t)st, 0, 0, 0, 0);
}
long sys_fstatat(int dirfd, const char* name, void* st, int flags)
{
int kfd = at_kfd(dirfd);
if (kfd != -1) {
size_t name_size = strlen(name)+1;
populate_mapping(st, sizeof(struct stat), PROT_WRITE);
return frontend_syscall(SYS_fstatat, kfd, (uintptr_t)name, name_size, (uintptr_t)st, flags, 0, 0);
}
return -EBADF;
}
long sys_stat(const char* name, void* st)
{
return sys_fstatat(AT_FDCWD, name, st, 0);
}
long sys_faccessat(int dirfd, const char *name, int mode)
{
int kfd = at_kfd(dirfd);
if (kfd != -1) {
size_t name_size = strlen(name)+1;
return frontend_syscall(SYS_faccessat, kfd, (uintptr_t)name, name_size, mode, 0, 0, 0);
}
return -EBADF;
}
long sys_access(const char *name, int mode)
{
return sys_faccessat(AT_FDCWD, name, mode);
}
long sys_linkat(int old_dirfd, const char* old_name, int new_dirfd, const char* new_name, int flags)
{
int old_kfd = at_kfd(old_dirfd);
int new_kfd = at_kfd(new_dirfd);
if (old_kfd != -1 && new_kfd != -1) {
size_t old_size = strlen(old_name)+1;
size_t new_size = strlen(new_name)+1;
return frontend_syscall(SYS_linkat, old_kfd, (uintptr_t)old_name, old_size,
new_kfd, (uintptr_t)new_name, new_size,
flags);
}
return -EBADF;
}
long sys_link(const char* old_name, const char* new_name)
{
return sys_linkat(AT_FDCWD, old_name, AT_FDCWD, new_name, 0);
}
long sys_unlinkat(int dirfd, const char* name, int flags)
{
int kfd = at_kfd(dirfd);
if (kfd != -1) {
size_t name_size = strlen(name)+1;
return frontend_syscall(SYS_unlinkat, kfd, (uintptr_t)name, name_size, flags, 0, 0, 0);
}
return -EBADF;
}
long sys_unlink(const char* name)
{
return sys_unlinkat(AT_FDCWD, name, 0);
}
long sys_mkdirat(int dirfd, const char* name, int mode)
{
int kfd = at_kfd(dirfd);
if (kfd != -1) {
size_t name_size = strlen(name)+1;
return frontend_syscall(SYS_mkdirat, kfd, (uintptr_t)name, name_size, mode, 0, 0, 0);
}
return -EBADF;
}
long sys_mkdir(const char* name, int mode)
{
return sys_mkdirat(AT_FDCWD, name, mode);
}
long sys_getcwd(const char* buf, size_t size)
{
populate_mapping(buf, size, PROT_WRITE);
return frontend_syscall(SYS_getcwd, (uintptr_t)buf, size, 0, 0, 0, 0, 0);
}
size_t sys_brk(size_t pos)
{
return do_brk(pos);
}
int sys_uname(void* buf)
{
const int sz = 65;
strcpy(buf + 0*sz, "Proxy Kernel");
strcpy(buf + 1*sz, "");
strcpy(buf + 2*sz, "3.4.5");
strcpy(buf + 3*sz, "");
strcpy(buf + 4*sz, "");
strcpy(buf + 5*sz, "");
return 0;
}
pid_t sys_getpid()
{
return 0;
}
int sys_getuid()
{
return 0;
}
uintptr_t sys_mmap(uintptr_t addr, size_t length, int prot, int flags, int fd, off_t offset)
{
uintptr_t ret = do_mmap(addr, length, prot, flags, fd, offset);
return ret;
}
int sys_munmap(uintptr_t addr, size_t length)
{
return do_munmap(addr, length);
}
uintptr_t sys_mremap(uintptr_t addr, size_t old_size, size_t new_size, int flags)
{
return do_mremap(addr, old_size, new_size, flags);
}
uintptr_t sys_mprotect(uintptr_t addr, size_t length, int prot)
{
return do_mprotect(addr, length, prot);
}
int sys_rt_sigaction(int sig, const void* act, void* oact, size_t sssz)
{
if (oact)
memset(oact, 0, sizeof(long) * 3);
return 0;
}
long sys_time(long* loc)
{
uintptr_t t = rdcycle() / CLOCK_FREQ;
if (loc)
*loc = t;
return t;
}
int sys_times(long* loc)
{
uintptr_t t = rdcycle();
kassert(CLOCK_FREQ % 1000000 == 0);
loc[0] = t / (CLOCK_FREQ / 1000000);
loc[1] = 0;
loc[2] = 0;
loc[3] = 0;
return 0;
}
int sys_gettimeofday(long* loc)
{
uintptr_t t = rdcycle();
loc[0] = t / CLOCK_FREQ;
loc[1] = (t % CLOCK_FREQ) / (CLOCK_FREQ / 1000000);
return 0;
}
ssize_t sys_writev(int fd, const long* iov, int cnt)
{
ssize_t ret = 0;
for (int i = 0; i < cnt; i++)
{
ssize_t r = sys_write(fd, (void*)iov[2*i], iov[2*i+1]);
if (r < 0)
return r;
ret += r;
}
return ret;
}
int sys_getdents(int fd, void* dirbuf, int count)
{
return 0; //stub
}
static int sys_stub_success()
{
return 0;
}
static int sys_stub_nosys()
{
return -ENOSYS;
}
long do_syscall(long a0, long a1, long a2, long a3, long a4, long a5, unsigned long n)
{
const static void* syscall_table[] = {
[SYS_exit] = sys_exit,
[SYS_exit_group] = sys_exit,
[SYS_read] = sys_read,
[SYS_pread] = sys_pread,
[SYS_write] = sys_write,
[SYS_openat] = sys_openat,
[SYS_close] = sys_close,
[SYS_fstat] = sys_fstat,
[SYS_lseek] = sys_lseek,
[SYS_fstatat] = sys_fstatat,
[SYS_linkat] = sys_linkat,
[SYS_unlinkat] = sys_unlinkat,
[SYS_mkdirat] = sys_mkdirat,
[SYS_renameat] = sys_renameat,
[SYS_getcwd] = sys_getcwd,
[SYS_brk] = sys_brk,
[SYS_uname] = sys_uname,
[SYS_getpid] = sys_getpid,
[SYS_getuid] = sys_getuid,
[SYS_geteuid] = sys_getuid,
[SYS_getgid] = sys_getuid,
[SYS_getegid] = sys_getuid,
[SYS_mmap] = sys_mmap,
[SYS_munmap] = sys_munmap,
[SYS_mremap] = sys_mremap,
[SYS_mprotect] = sys_mprotect,
[SYS_rt_sigaction] = sys_rt_sigaction,
[SYS_gettimeofday] = sys_gettimeofday,
[SYS_times] = sys_times,
[SYS_writev] = sys_writev,
[SYS_faccessat] = sys_faccessat,
[SYS_fcntl] = sys_fcntl,
[SYS_ftruncate] = sys_ftruncate,
[SYS_getdents] = sys_getdents,
[SYS_dup] = sys_dup,
[SYS_readlinkat] = sys_stub_nosys,
[SYS_rt_sigprocmask] = sys_stub_success,
[SYS_ioctl] = sys_stub_nosys,
[SYS_clock_gettime] = sys_stub_nosys,
[SYS_getrusage] = sys_stub_nosys,
[SYS_getrlimit] = sys_stub_nosys,
[SYS_setrlimit] = sys_stub_nosys,
};
const static void* old_syscall_table[] = {
[-OLD_SYSCALL_THRESHOLD + SYS_open] = sys_open,
[-OLD_SYSCALL_THRESHOLD + SYS_link] = sys_link,
[-OLD_SYSCALL_THRESHOLD + SYS_unlink] = sys_unlink,
[-OLD_SYSCALL_THRESHOLD + SYS_mkdir] = sys_mkdir,
[-OLD_SYSCALL_THRESHOLD + SYS_access] = sys_access,
[-OLD_SYSCALL_THRESHOLD + SYS_stat] = sys_stat,
[-OLD_SYSCALL_THRESHOLD + SYS_lstat] = sys_lstat,
[-OLD_SYSCALL_THRESHOLD + SYS_time] = sys_time,
};
syscall_t f = 0;
if (n < ARRAY_SIZE(syscall_table))
f = syscall_table[n];
else if (n - OLD_SYSCALL_THRESHOLD < ARRAY_SIZE(old_syscall_table))
f = old_syscall_table[n - OLD_SYSCALL_THRESHOLD];
if (!f)
panic("bad syscall #%ld!",n);
return f(a0, a1, a2, a3, a4, a5, n);
}
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