/home/travis/build/MoarVM/MoarVM/src/platform/posix/mmap.c
Line | Count | Source (jump to first uncovered line) |
1 | | #include <stddef.h> |
2 | | #include <sys/mman.h> |
3 | | #include "moar.h" |
4 | | #include "platform/mmap.h" |
5 | | #include <errno.h> |
6 | | |
7 | | /* MAP_ANONYMOUS is Linux, MAP_ANON is BSD */ |
8 | | #ifndef MVM_MAP_ANON |
9 | | |
10 | | #if defined(MAP_ANONYMOUS) |
11 | 10.7k | #define MVM_MAP_ANON MAP_ANONYMOUS |
12 | | |
13 | | #elif defined(MAP_ANON) |
14 | | #define MVM_MAP_ANON MAP_ANON |
15 | | |
16 | | #else |
17 | | #error "Anonymous mmap() not supported. You need to define MVM_MAP_ANON manually if it is." |
18 | | #endif |
19 | | #endif |
20 | | |
21 | 21.4k | static int page_mode_to_prot_mode(int page_mode) { |
22 | 21.4k | switch (page_mode) { |
23 | 0 | case MVM_PAGE_READ: |
24 | 0 | return PROT_READ; |
25 | 0 | case MVM_PAGE_WRITE: |
26 | 0 | return PROT_WRITE; |
27 | 10.7k | case (MVM_PAGE_READ|MVM_PAGE_WRITE): |
28 | 10.7k | return PROT_READ|PROT_WRITE; |
29 | 0 | case MVM_PAGE_EXEC: |
30 | 0 | return PROT_EXEC; |
31 | 10.7k | case (MVM_PAGE_READ|MVM_PAGE_EXEC): |
32 | 10.7k | return PROT_READ|PROT_EXEC; |
33 | 0 | case (MVM_PAGE_WRITE|MVM_PAGE_EXEC): |
34 | 0 | return PROT_WRITE|PROT_EXEC; |
35 | 0 | case (MVM_PAGE_READ|MVM_PAGE_WRITE|MVM_PAGE_EXEC): |
36 | 0 | return PROT_READ|PROT_WRITE|PROT_EXEC; |
37 | 0 | default: |
38 | 0 | return PROT_NONE; |
39 | 21.4k | } |
40 | 21.4k | } |
41 | | |
42 | | void *MVM_platform_alloc_pages(size_t size, int page_mode) |
43 | 10.7k | { |
44 | 10.7k | int prot_mode = page_mode_to_prot_mode(page_mode); |
45 | 10.7k | void *block = mmap(NULL, size, prot_mode, MVM_MAP_ANON | MAP_PRIVATE, -1, 0); |
46 | 10.7k | |
47 | 10.7k | if (block == MAP_FAILED) |
48 | 0 | MVM_panic(1, "MVM_platform_alloc_pages failed: %d", errno); |
49 | 10.7k | |
50 | 10.7k | return block; |
51 | 10.7k | } |
52 | | |
53 | 10.7k | int MVM_platform_set_page_mode(void * block, size_t size, int page_mode) { |
54 | 10.7k | int prot_mode = page_mode_to_prot_mode(page_mode); |
55 | 10.7k | return mprotect(block, size, prot_mode) == 0; |
56 | 10.7k | } |
57 | | |
58 | | int MVM_platform_free_pages(void *block, size_t size) |
59 | 0 | { |
60 | 0 | return munmap(block, size) == 0; |
61 | 0 | } |
62 | | |
63 | | void *MVM_platform_map_file(int fd, void **handle, size_t size, int writable) |
64 | 1.58k | { |
65 | 1.58k | void *block = mmap(NULL, size, |
66 | 0 | writable ? PROT_READ | PROT_WRITE : PROT_READ, |
67 | 1.58k | writable ? MAP_SHARED : MAP_PRIVATE, fd, 0); |
68 | 1.58k | |
69 | 1.58k | (void)handle; |
70 | 1.58k | return block != MAP_FAILED ? block : NULL; |
71 | 1.58k | } |
72 | | |
73 | | int MVM_platform_unmap_file(void *block, void *handle, size_t size) |
74 | 0 | { |
75 | 0 | (void)handle; |
76 | 0 | return munmap(block, size) == 0; |
77 | 0 | } |