lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 298 insertions, 0 deletions

diff --git a/lib/mlibc/sysdeps/dripos/generic/generic.cpp b/lib/mlibc/sysdeps/dripos/generic/generic.cpp
new file mode 100644
index 0000000..89203c3
--- /dev/null
+++ b/lib/mlibc/sysdeps/dripos/generic/generic.cpp
@@ -0,0 +1,298 @@
+#include <bits/ensure.h>
+#include <mlibc/debug.hpp>
+#include <mlibc/all-sysdeps.hpp>
+#include <mlibc/thread-entry.hpp>
+#include <errno.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <limits.h>
+
+namespace mlibc {
+
+void sys_libc_log(const char *message) {
+	unsigned long res;
+	asm volatile ("syscall" : "=a"(res)
+			: "a"(50), "D"(message)
+			: "rcx", "r11", "rdx");
+}
+
+void sys_libc_panic() {
+	mlibc::infoLogger() << "\e[31mmlibc: panic!" << frg::endlog;
+	asm volatile ("syscall" :
+			: "a"(12), "D"(1)
+			: "rcx", "r11", "rdx");
+}
+
+int sys_tcb_set(void *pointer) {
+	int res;
+	asm volatile ("syscall" : "=a"(res)
+			: "a"(300), "D"(pointer)
+			: "rcx", "r11", "rdx");
+	return res;
+}
+
+int sys_anon_allocate(size_t size, void **pointer) {
+	void *ret;
+	int sys_errno;
+
+	asm volatile ("syscall"
+			: "=a"(ret), "=d"(sys_errno)
+			: "a"(9), "D"(0), "S"(size)
+			: "rcx", "r11");
+
+	if (!ret)
+		return sys_errno;
+
+	*pointer = ret;
+	return 0;
+}
+
+int sys_anon_free(void *pointer, size_t size) {
+	int unused_return;
+	int sys_errno;
+
+	asm volatile ("syscall"
+			: "=a"(unused_return), "=d"(sys_errno)
+			: "a"(11), "D"(pointer), "S"(size)
+			: "rcx", "r11");
+
+	if (unused_return)
+		return sys_errno;
+
+	return 0;
+}
+
+#ifndef MLIBC_BUILDING_RTDL
+void sys_exit(int status) {
+	asm volatile ("syscall" :
+			: "a"(12), "D"(status)
+			: "rcx", "r11", "rdx");
+}
+#endif
+
+#ifndef MLIBC_BUILDING_RTDL
+int sys_clock_get(int clock, time_t *secs, long *nanos) {
+	return 0;
+}
+#endif
+
+int sys_open(const char *path, int flags, mode_t mode, int *fd) {
+	int ret;
+	int sys_errno;
+
+	asm volatile ("syscall"
+			: "=a"(ret), "=d"(sys_errno)
+			: "a"(2), "D"(path), "S"(flags), "d"(0)
+			: "rcx", "r11");
+
+	if (ret == -1)
+		return sys_errno;
+
+	*fd = ret;
+	return 0;
+}
+
+int sys_close(int fd) {
+	int ret;
+	int sys_errno;
+
+	asm volatile ("syscall"
+			: "=a"(ret), "=d"(sys_errno)
+			: "a"(3), "D"(fd)
+			: "rcx", "r11");
+
+	if (ret == -1)
+		return sys_errno;
+
+	return 0;
+}
+
+int sys_read(int fd, void *buf, size_t count, ssize_t *bytes_read) {
+	ssize_t ret;
+	int sys_errno;
+
+	asm volatile ("syscall"
+			: "=a"(ret), "=d"(sys_errno)
+			: "a"(0), "D"(fd), "S"(buf), "d"(count)
+			: "rcx", "r11");
+
+	if (ret == -1)
+		return sys_errno;
+
+	*bytes_read = ret;
+	return 0;
+}
+
+#ifndef MLIBC_BUILDING_RTDL
+int sys_write(int fd, const void *buf, size_t count, ssize_t *bytes_written) {
+	ssize_t ret;
+	int sys_errno;
+
+	asm volatile ("syscall"
+			: "=a"(ret), "=d"(sys_errno)
+			: "a"(1), "D"(fd), "S"(buf), "d"(count)
+			: "rcx", "r11");
+
+	if (ret == -1)
+		return sys_errno;
+
+	*bytes_written = ret;
+	return 0;
+}
+#endif
+
+
+int sys_seek(int fd, off_t offset, int whence, off_t *new_offset) {
+	off_t ret;
+	int sys_errno;
+
+	asm volatile ("syscall"
+			: "=a"(ret), "=d"(sys_errno)
+			: "a"(8), "D"(fd), "S"(offset), "d"(whence)
+			: "rcx", "r11");
+
+	if (ret == -1)
+		return sys_errno;
+
+	*new_offset = ret;
+	return 0;
+}
+
+int sys_vm_map(void *hint, size_t size, int prot, int flags,
+		int fd, off_t offset, void **window) {
+	__ensure(flags & MAP_ANONYMOUS);
+	void *ret;
+	int sys_errno;
+
+	// mlibc::infoLogger() << "calling sys_vm_map with size: " << size << frg::endlog;
+
+	asm volatile ("syscall"
+			: "=a"(ret), "=d"(sys_errno)
+			: "a"(9), "D"(hint), "S"(size)
+			: "rcx", "r11");
+
+	if (!ret)
+		return sys_errno;
+
+	*window = ret;
+
+	return 0;
+}
+
+int sys_vm_unmap(void *pointer, size_t size) {
+	return sys_anon_free(pointer, size);
+}
+
+int sys_futex_wait(int *pointer, int expected, const struct timespec *time) {
+	uint64_t err;
+	asm volatile ("syscall"
+			: "=d"(err)
+			: "a"(66), "D"(pointer), "S"(expected)
+			: "rcx", "r11");
+
+	if (err) {
+		return -1;
+	}
+
+	return 0;
+}
+
+int sys_futex_wake(int *pointer) {
+	uint64_t err;
+	asm volatile ("syscall"
+			: "=d"(err)
+			: "a"(65), "D"(pointer)
+			: "rcx", "r11");
+
+	if (err) {
+		return -1;
+	}
+
+	return 0;
+}
+
+// All remaining functions are disabled in ldso.
+#ifndef MLIBC_BUILDING_RTDL
+
+int sys_clone(void *tcb, pid_t *tid_out, void *stack) {
+	int tid;
+
+	asm volatile ("syscall"
+		: "=a"(tid)
+		: "a"(67), "D"(__mlibc_start_thread), "S"(stack), "d"(tcb)
+		: "rcx", "r11");
+
+	if (tid_out)
+		*tid_out = tid;
+
+	return 0;
+}
+
+void sys_thread_exit() {
+	asm volatile ("syscall"
+			:
+			: "a"(68)
+			: "rcx", "r11");
+	__builtin_trap();
+}
+
+int sys_sleep(time_t *secs, long *nanos) {
+	long ms = (*nanos / 1000000) + (*secs * 1000);
+	asm volatile ("syscall"
+		:
+		: "a"(6), "D"(ms)
+		: "rcx", "r11");
+	*secs = 0;
+	*nanos = 0;
+	return 0;
+}
+
+int sys_fork(pid_t *child) {
+	pid_t ret;
+	int sys_errno;
+
+	asm volatile ("syscall"
+			: "=a"(ret), "=d"(sys_errno)
+			: "a"(57)
+			: "rcx", "r11");
+
+	if (ret == -1)
+		return sys_errno;
+
+	*child = ret;
+	return 0;
+}
+
+int sys_execve(const char *path, char *const argv[], char *const envp[]) {
+	int ret;
+	int sys_errno;
+
+	asm volatile ("syscall"
+			: "=a"(ret), "=d"(sys_errno)
+			: "a"(59), "D"(path), "S"(argv), "d"(envp)
+			: "rcx", "r11");
+
+	if (sys_errno != 0)
+		return sys_errno;
+
+	return 0;
+}
+
+pid_t sys_getpid() {
+	pid_t pid;
+	asm volatile ("syscall" : "=a"(pid)
+			: "a"(5)
+			: "rcx", "r11", "rdx");
+	return pid;
+}
+pid_t sys_getppid() {
+	pid_t ppid;
+	asm volatile ("syscall" : "=a"(ppid)
+			: "a"(14)
+			: "rcx", "r11", "rdx");
+	return ppid;
+}
+
+#endif // MLIBC_BUILDING_RTDL
+
+} // namespace mlibc