user: break out the shell and tests into separate binaries

1 files changed, 259 insertions, 0 deletions

diff --git a/src/user/app/tests/tests.c b/src/user/app/tests/tests.c
new file mode 100644
index 0000000..458f748
--- /dev/null
+++ b/src/user/app/tests/tests.c
@@ -0,0 +1,259 @@
+#define TEST_MACROS
+#include "tests.h"
+#include <camellia/errno.h>
+#include <camellia/execbuf.h>
+#include <camellia/flags.h>
+#include <camellia/syscalls.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void run_forked(void (*fn)()) {
+	if (!fork()) {
+		fn();
+		exit(0);
+	} else {
+		/* successful tests must return 0
+		 * TODO add a better fail msg */
+		if (_syscall_await() != 0) test_fail();
+	}
+}
+
+
+const char *tmpfilepath = "/tmp/.test_internal";
+
+static void test_await(void) {
+	/* creates 16 child processes, each returning a different value. then checks
+	 * if await() returns every value exactly once */
+	int ret;
+	int counts[16] = {0};
+
+	for (int i = 0; i < 16; i++)
+		if (!fork())
+			exit(i);
+
+	while ((ret = _syscall_await()) != ~0) {
+		assert(0 <= ret && ret < 16);
+		counts[ret]++;
+	}
+
+	for (int i = 0; i < 16; i++)
+		assert(counts[i] == 1);
+}
+
+static void test_faults(void) {
+	/* tests what happens when child processes fault.
+	 * expected behavior: parent processes still manages to finish, and it can
+	 * reap all its children */
+	int await_cnt = 0;
+
+	if (!fork()) { // invalid memory access
+		asm volatile("movb $69, 0" ::: "memory");
+		printf("this shouldn't happen");
+		exit(-1);
+	}
+	if (!fork()) { // #GP
+		asm volatile("hlt" ::: "memory");
+		printf("this shouldn't happen");
+		exit(-1);
+	}
+
+	while (_syscall_await() != ~0) await_cnt++;
+	assert(await_cnt == 2);
+}
+
+static void test_interrupted_fs(void) {
+	handle_t h;
+	if (_syscall_fork(FORK_NEWFS, &h)) { /* child */
+		// TODO make a similar test with all 0s passed to fs_wait
+		struct fs_wait_response res;
+		_syscall_fs_wait(NULL, 0, &res);
+		exit(0);
+	} else { /* parent */
+		_syscall_mount(h, "/", 1);
+		int ret = _syscall_open("/", 1, 0);
+		// the handler quits while handling that call - but this syscall should return anyways
+		exit(ret < 0 ? 0 : -1);
+	}
+}
+
+static void test_orphaned_fs(void) {
+	handle_t h;
+	if (_syscall_fork(FORK_NEWFS, &h)) { /* child */
+		exit(0);
+	} else { /* parent */
+		_syscall_mount(h, "/", 1);
+		int ret = _syscall_open("/", 1, 0);
+		// no handler will ever be available to handle this call - the syscall should instantly return
+		exit(ret < 0 ? 0 : -1);
+	}
+}
+
+static void test_memflag(void) {
+	void *page = (void*)0x77777000;
+	_syscall_memflag(page, 4096, MEMFLAG_PRESENT); // allocate page
+	memset(page, 77, 4096); // write to it
+	_syscall_memflag(page, 4096, 0); // free it
+
+	if (!fork()) {
+		memset(page, 11, 4096); // should segfault
+		exit(0);
+	} else {
+		assert(_syscall_await() != 0); // test if the process crashed
+	}
+
+	char *pages[4];
+	for (size_t i = 0; i < 4; i++) {
+		pages[i] = _syscall_memflag(NULL, 4096, MEMFLAG_FINDFREE);
+		printf("[test_memflag] findfree: 0x%x\n", pages[i]);
+
+		assert(pages[i] == _syscall_memflag(NULL, 4096, MEMFLAG_FINDFREE | MEMFLAG_PRESENT));
+		if (i > 0) assert(pages[i] != pages[i-1]);
+		*pages[i] = 0x77;
+	}
+
+	for (size_t i = 0; i < 4; i++)
+		_syscall_memflag(pages, 4096, MEMFLAG_PRESENT);
+
+	// TODO check if reclaims
+}
+
+static void test_dup(void) {
+	handle_t pipe[2];
+	handle_t h1, h2;
+	assert(_syscall_pipe(pipe, 0) >= 0);
+
+	if (!fork()) {
+		close(pipe[0]);
+
+		h1 = _syscall_dup(pipe[1], -1, 0);
+		assert(h1 >= 0);
+		assert(h1 != pipe[1]);
+		h2 = _syscall_dup(h1, -1, 0);
+		assert(h2 >= 0);
+		assert(h2 != pipe[1] && h2 != h1);
+
+		_syscall_write(pipe[1], "og", 2, 0);
+		_syscall_write(h1, "h1", 2, 0);
+		_syscall_write(h2, "h2", 2, 0);
+
+		close(pipe[1]);
+		_syscall_write(h1, "h1", 2, 0);
+		_syscall_write(h2, "h2", 2, 0);
+
+		assert(_syscall_dup(h1, pipe[1], 0) == pipe[1]);
+		assert(_syscall_dup(h2, pipe[1], 0) == pipe[1]);
+		assert(_syscall_dup(h1, pipe[1], 0) == pipe[1]);
+		assert(_syscall_dup(h2, pipe[1], 0) == pipe[1]);
+		close(h1);
+		close(h2);
+
+		assert(_syscall_dup(pipe[1], h2, 0) == h2);
+		_syscall_write(h2, "h2", 2, 0);
+		close(h2);
+
+		assert(_syscall_dup(pipe[1], h1, 0) == h1);
+		_syscall_write(h1, "h1", 2, 0);
+		close(h1);
+
+		exit(0);
+	} else {
+		char buf[16];
+		size_t count = 0;
+		close(pipe[1]);
+		while (_syscall_read(pipe[0], buf, sizeof buf, 0) >= 0)
+			count++;
+		assert(count == 7);
+		_syscall_await();
+	}
+
+
+	close(pipe[0]);
+}
+
+static void test_malloc(void) {
+	// not really a test
+	void *p1, *p2;
+
+	p1 = malloc(420);
+	printf("p1 = 0x%x\n", p1);
+
+	p2 = malloc(1024);
+	printf("p2 = 0x%x\n", p2);
+	free(p2);
+	p2 = malloc(256);
+	printf("p2 = 0x%x\n", p2);
+	free(p2);
+	p2 = malloc(4096);
+	printf("p2 = 0x%x\n", p2);
+	free(p2);
+
+	free(p1);
+}
+
+static void test_efault(void) {
+	const char *str = "o, 16 characters";
+	char str2[16];
+	char *invalid = (void*)0x1000;
+	handle_t h;
+
+	memcpy(str2, str, 16);
+
+	assert((h = _syscall_open(tmpfilepath, strlen(tmpfilepath), OPEN_CREATE)));
+	assert(_syscall_write(h, str, 16, 0) == 16);
+	assert(_syscall_write(h, str2, 16, 0) == 16);
+
+	assert(_syscall_write(h, invalid, 16, 0) == -EFAULT);
+
+	/* x64 canonical pointers */
+	assert(_syscall_write(h, (void*)((uintptr_t)str ^ 0x8000000000000000), 16, 0) == -EFAULT);
+	assert(_syscall_write(h, (void*)((uintptr_t)str ^ 0x1000000000000000), 16, 0) == -EFAULT);
+	assert(_syscall_write(h, (void*)((uintptr_t)str ^ 0x0100000000000000), 16, 0) == -EFAULT);
+	assert(_syscall_write(h, (void*)((uintptr_t)str ^ 0x0010000000000000), 16, 0) == -EFAULT);
+	assert(_syscall_write(h, (void*)((uintptr_t)str ^ 0x0001000000000000), 16, 0) == -EFAULT);
+	assert(_syscall_write(h, (void*)((uintptr_t)str ^ 0x0000800000000000), 16, 0) == -EFAULT);
+
+	assert(_syscall_write(h, (void*)((uintptr_t)str2 ^ 0x8000000000000000), 16, 0) == -EFAULT);
+	assert(_syscall_write(h, (void*)((uintptr_t)str2 ^ 0x1000000000000000), 16, 0) == -EFAULT);
+	assert(_syscall_write(h, (void*)((uintptr_t)str2 ^ 0x0100000000000000), 16, 0) == -EFAULT);
+	assert(_syscall_write(h, (void*)((uintptr_t)str2 ^ 0x0010000000000000), 16, 0) == -EFAULT);
+	assert(_syscall_write(h, (void*)((uintptr_t)str2 ^ 0x0001000000000000), 16, 0) == -EFAULT);
+	assert(_syscall_write(h, (void*)((uintptr_t)str2 ^ 0x0000800000000000), 16, 0) == -EFAULT);
+
+	assert(_syscall_write(h, str, 16, 0) == 16);
+	close(h);
+}
+
+static void test_execbuf(void) {
+	// not really a test, TODO
+	const char str1[] = "test_execbuf: string 1\n";
+	const char str2[] = "test_execbuf: and 2\n";
+	uint64_t buf[] = {
+		EXECBUF_SYSCALL, _SYSCALL_WRITE, 1, (uintptr_t)str1, sizeof(str1) - 1, -1,
+		EXECBUF_SYSCALL, _SYSCALL_WRITE, 1, (uintptr_t)str2, sizeof(str2) - 1, -1,
+		EXECBUF_SYSCALL, _SYSCALL_EXIT, 0, 0, 0, 0,
+	};
+	_syscall_execbuf(buf, sizeof buf);
+	test_fail();
+}
+
+static void test_misc(void) {
+	assert(_syscall(~0, 0, 0, 0, 0) < 0); /* try making an invalid syscall */
+}
+
+
+int main(void) {
+	run_forked(test_await);
+	run_forked(test_faults);
+	run_forked(test_interrupted_fs);
+	run_forked(test_orphaned_fs);
+	run_forked(test_memflag);
+	run_forked(test_dup);
+	run_forked(test_malloc);
+	run_forked(test_pipe);
+	run_forked(test_semaphore);
+	run_forked(test_efault);
+	run_forked(test_execbuf);
+	run_forked(test_misc);
+	return 1;
+}