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      1 /*
      2  * Check decoding of SPARC-specific kern_features syscall.
      3  *
      4  * Copyright (c) 2018 The strace developers.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. The name of the author may not be used to endorse or promote products
     16  *    derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include "tests.h"
     31 
     32 #include <asm/unistd.h>
     33 
     34 #include "raw_syscall.h"
     35 #include "scno.h"
     36 
     37 #if defined __NR_kern_features && defined raw_syscall_0
     38 
     39 # include <errno.h>
     40 # include <stdio.h>
     41 # include <stdlib.h>
     42 # include <unistd.h>
     43 
     44 static void
     45 test_kern_features(unsigned int num)
     46 {
     47 	/* The expected return codes, as enforced by fault injection */
     48 	static struct {
     49 		kernel_ulong_t ret;
     50 		const char *str;
     51 	} checks[] = {
     52 		{ 0, NULL },
     53 		{ 1, "KERN_FEATURE_MIXED_MODE_STACK" },
     54 		{ 2, "0x2" },
     55 		{ 0x7ffffffe, "0x7ffffffe" },
     56 		{ 0x7fffffff, "KERN_FEATURE_MIXED_MODE_STACK|0x7ffffffe" },
     57 		{ (kernel_ulong_t) 0xbadc0deddeadfaceULL,
     58 			sizeof(kernel_ulong_t) == 8 ?
     59 			"0xbadc0deddeadface" : "0xdeadface" },
     60 		{ (kernel_ulong_t) -1ULL,
     61 			sizeof(kernel_ulong_t) == 8 ?
     62 			"KERN_FEATURE_MIXED_MODE_STACK|0xfffffffffffffffe" :
     63 			"KERN_FEATURE_MIXED_MODE_STACK|0xfffffffe" },
     64 	};
     65 
     66 	kernel_ulong_t err = 0;
     67 	kernel_ulong_t rc = raw_syscall_0(__NR_kern_features, &err);
     68 
     69 	if (err) {
     70 		errno = rc;
     71 		printf("kern_features() = %s\n", sprintrc(-1));
     72 		return;
     73 	}
     74 
     75 	printf("kern_features() = %#llx", (unsigned long long) rc);
     76 
     77 	if (num < ARRAY_SIZE(checks)) {
     78 		if (rc != checks[num].ret)
     79 			error_msg_and_fail("Expected return value (%llx) "
     80 					   "doesn't match expected one (%#llx)",
     81 					   (unsigned long long) rc,
     82 					   (unsigned long long) checks[num].ret);
     83 
     84 		if (checks[num].str)
     85 			printf(" (%s)", checks[num].str);
     86 
     87 		printf(" (INJECTED)");
     88 	} else if (rc) {
     89 		printf(" (");
     90 
     91 		if (rc & 1)
     92 			printf("KERN_FEATURE_MIXED_MODE_STACK");
     93 
     94 		if (rc & ~1ULL) {
     95 			if (rc & 1)
     96 				printf("|");
     97 
     98 			printf("%#llx", rc & ~1ULL);
     99 		}
    100 
    101 		printf(")");
    102 	}
    103 
    104 	puts("");
    105 }
    106 
    107 int
    108 main(int ac, char **av)
    109 {
    110 	test_kern_features(ac > 1 ? atoi(av[1]) : -1);
    111 
    112 	puts("+++ exited with 0 +++");
    113 	return 0;
    114 }
    115 
    116 #else
    117 
    118 SKIP_MAIN_UNDEFINED("__NR_kern_features && raw_syscall_0");
    119 
    120 #endif
    121