2 * Check decoding of remap_file_pages syscall.
4 * Copyright (c) 2016-2017 Dmitry V. Levin <ldv@altlinux.org>
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31 #include <asm/unistd.h>
33 #ifdef __NR_remap_file_pages
38 # include <linux/mman.h>
40 static const char *errstr;
43 k_remap_file_pages(const kernel_ulong_t addr,
44 const kernel_ulong_t size,
45 const kernel_ulong_t prot,
46 const kernel_ulong_t pgoff,
47 const kernel_ulong_t flags)
49 const long rc = syscall(__NR_remap_file_pages,
50 addr, size, prot, pgoff, flags);
51 errstr = sprintrc(rc);
58 kernel_ulong_t addr = (kernel_ulong_t) 0xfacefeeddeadbeefULL;
59 kernel_ulong_t size = (kernel_ulong_t) 0xdefaced1bad2f00dULL;
60 kernel_ulong_t prot = PROT_READ|PROT_WRITE|PROT_EXEC;
61 kernel_ulong_t pgoff = (kernel_ulong_t) 0xcaf3babebad4deedULL;
62 kernel_ulong_t flags = MAP_PRIVATE|MAP_ANONYMOUS;
64 k_remap_file_pages(addr, size, prot, pgoff, flags);
65 printf("remap_file_pages(%#jx, %ju, %s, %ju, %s) = %s\n",
66 (uintmax_t) addr, (uintmax_t) size,
67 "PROT_READ|PROT_WRITE|PROT_EXEC",
68 (uintmax_t) pgoff, "MAP_PRIVATE|MAP_ANONYMOUS", errstr);
72 # ifndef MAP_HUGE_SHIFT
73 # define MAP_HUGE_SHIFT 26
75 # define MAP_HUGE_2MB (21 << MAP_HUGE_SHIFT)
76 # endif /* !MAP_HUGE_2MB */
77 addr = (kernel_ulong_t) 0xfacefeeddeadf00dULL;
78 size = (kernel_ulong_t) 0xdefaced1bad2beefULL;
79 prot = (kernel_ulong_t) 0xdefaced00000000ULL | PROT_NONE;
80 flags = MAP_TYPE | MAP_FIXED | MAP_NORESERVE | MAP_HUGETLB | MAP_HUGE_2MB;
82 k_remap_file_pages(addr, size, prot, pgoff, flags);
83 printf("remap_file_pages(%#jx, %ju, %s, %ju"
85 "|MAP_FIXED|MAP_NORESERVE|MAP_HUGETLB|21<<MAP_HUGE_SHIFT)"
87 (uintmax_t) addr, (uintmax_t) size,
88 prot == PROT_NONE ? "PROT_NONE" :
89 "0xdefaced00000000 /* PROT_??? */",
90 (uintmax_t) pgoff, MAP_TYPE, errstr);
91 #endif /* MAP_HUGETLB */
93 puts("+++ exited with 0 +++");
99 SKIP_MAIN_UNDEFINED("__NR_remap_file_pages")