1 /* SPDX-License-Identifier: GPL-2.0 */
3  * syscall_numbering.c - test calling the x86-64 kernel with various
33 /* x64-only system call numbers */
37 /* x32-only system call numbers (without X32_BIT) */
44 static int nullfd = -1;		/* File descriptor for /dev/null */
64 	[PTP_INTNUM]	= "sign-extending the syscall number",
80 	unsigned int level = sh ? sh->indent : 0;  in offset()
85 #define msg(lvl, fmt, ...) printf("%-*s" fmt, offset(), "[" #lvl "]", \
95 		sh->nerr++;				\
100 		sh->indent = 0;				\
106 /* Sentinel for ptrace-modified return value */
107 #define MODIFIED_BY_PTRACE	-9999
115 static long long probe_syscall(int msb, int lsb)  in probe_syscall()  argument
123 	long long nr = ((long long)msb << 32) | (unsigned int)lsb;  in probe_syscall()
133 	sh->probing_syscall = true;  in probe_syscall()
140 	sh->probing_syscall = false;  in probe_syscall()
145 static const char *syscall_str(int msb, int start, int end)  in syscall_str()  argument
153 	 * toward zero so we don't display -1 as -1073741825.  in syscall_str()
162 			 type, msb, lsb);  in syscall_str()
165 			 type, msb, lsb, lsb + (end-start));  in syscall_str()
170 static unsigned int _check_for(int msb, int start, int end, long long expect,  in _check_for()  argument
175 	sh->indent++;  in _check_for()
177 		sh->indent++;  in _check_for()
180 		long long ret = probe_syscall(msb, nr);  in _check_for()
184 			       syscall_str(msb, nr, nr),  in _check_for()
191 		sh->indent--;  in _check_for()
196 			     syscall_str(msb, start, end),  in _check_for()
200 		   syscall_str(msb, start, end), expect_str);  in _check_for()
203 	sh->indent--;  in _check_for()
208 #define check_for(msb,start,end,expect) \  argument
209 	_check_for(msb,start,end,expect,#expect)
211 static bool check_zero(int msb, int nr)  in check_zero()  argument
213 	return check_for(msb, nr, nr, 0);  in check_zero()
216 static bool check_enosys(int msb, int nr)  in check_enosys()  argument
218 	return check_for(msb, nr, nr, -ENOSYS);  in check_enosys()
234 	sh->indent++;  in test_x32()
238 	} else if (ret == -ENOSYS) {  in test_x32()
242 …fail("x32 getpid() returned %lld, but it should have returned either %lld or -ENOSYS\n", ret, (lon…  in test_x32()
245 	sh->indent--;  in test_x32()
249 static void test_syscalls_common(int msb)  in test_syscalls_common()  argument
251 	enum ptrace_pass pass = sh->ptrace_pass;  in test_syscalls_common()
254 	check_zero(msb, SYS_READ);  in test_syscalls_common()
255 	check_zero(msb, SYS_WRITE);  in test_syscalls_common()
257 	run("Checking some 64-bit only syscalls as 64 bit\n");  in test_syscalls_common()
258 	check_zero(msb, X64_READV);  in test_syscalls_common()
259 	check_zero(msb, X64_WRITEV);  in test_syscalls_common()
262 	check_for(msb, -64, -2, -ENOSYS);  in test_syscalls_common()
264 		check_for(msb, -1, -1, MODIFIED_BY_PTRACE);  in test_syscalls_common()
266 		check_for(msb, -1, -1, -ENOSYS);  in test_syscalls_common()
267 	check_for(msb, X32_BIT-64, X32_BIT-1, -ENOSYS);  in test_syscalls_common()
268 	check_for(msb, -64-X32_BIT, -1-X32_BIT, -ENOSYS);  in test_syscalls_common()
269 	check_for(msb, INT_MAX-64, INT_MAX-1, -ENOSYS);  in test_syscalls_common()
272 static void test_syscalls_with_x32(int msb)  in test_syscalls_with_x32()  argument
275 	 * Syscalls 512-547 are "x32" syscalls.  They are  in test_syscalls_with_x32()
281 	check_for(msb, 512, 547, -ENOSYS);  in test_syscalls_with_x32()
284 	check_zero(msb, SYS_READ   | X32_BIT);  in test_syscalls_with_x32()
285 	check_zero(msb, SYS_WRITE  | X32_BIT);  in test_syscalls_with_x32()
288 	check_zero(msb, X32_READV  | X32_BIT);  in test_syscalls_with_x32()
289 	check_zero(msb, X32_WRITEV | X32_BIT);  in test_syscalls_with_x32()
291 	run("Checking some 64-bit syscalls as x32\n");  in test_syscalls_with_x32()
292 	check_enosys(msb, X64_IOCTL  | X32_BIT);  in test_syscalls_with_x32()
293 	check_enosys(msb, X64_READV  | X32_BIT);  in test_syscalls_with_x32()
294 	check_enosys(msb, X64_WRITEV | X32_BIT);  in test_syscalls_with_x32()
297 static void test_syscalls_without_x32(int msb)  in test_syscalls_without_x32()  argument
300 	check_for(msb, 0 | X32_BIT, 999 | X32_BIT, -ENOSYS);  in test_syscalls_without_x32()
306 		0, 1, -1, X32_BIT-1, X32_BIT, X32_BIT-1, -X32_BIT, INT_MAX,  in test_syscall_numbering()
310 	sh->indent++;  in test_syscall_numbering()
313 	 * The MSB is supposed to be ignored, so we loop over a few  in test_syscall_numbering()
317 		int msb = msbs[i];  in test_syscall_numbering()  local
318 		run("Checking system calls with msb = %d (0x%x)\n",  in test_syscall_numbering()
319 		    msb, msb);  in test_syscall_numbering()
321 		sh->indent++;  in test_syscall_numbering()
323 		test_syscalls_common(msb);  in test_syscall_numbering()
325 			test_syscalls_with_x32(msb);  in test_syscall_numbering()
327 			test_syscalls_without_x32(msb);  in test_syscall_numbering()
329 		sh->indent--;  in test_syscall_numbering()
332 	sh->indent--;  in test_syscall_numbering()
345 	for (sh->ptrace_pass = pass = PTP_NOTHING; pass < PTP_DONE;  in syscall_numbering_tracee()
346 	     sh->ptrace_pass = ++pass) {  in syscall_numbering_tracee()
356 	sh->probing_syscall = false; /* Do this on entry only */  in mess_with_syscall()
409 		if (sh->probing_syscall && WSTOPSIG(wstatus) == SIGTRAP)  in syscall_numbering_tracer()
410 			mess_with_syscall(testpid, sh->ptrace_pass);  in syscall_numbering_tracer()
411 	} while (sh->ptrace_pass != PTP_DONE &&  in syscall_numbering_tracer()
473 	nerr = sh->nerr;  in main()