swissChili | 8cfb7c4 | 2021-04-18 21:17:58 -0700 | [diff] [blame] | 1 | #include "plat.h" |
| 2 | #include <stdlib.h> |
| 3 | #include <string.h> |
swissChili | f3e7f18 | 2021-04-20 13:57:22 -0700 | [diff] [blame] | 4 | #include <sys/mman.h> |
swissChili | 8cfb7c4 | 2021-04-18 21:17:58 -0700 | [diff] [blame] | 5 | |
swissChili | 53472e8 | 2021-05-08 16:06:32 -0700 | [diff] [blame] | 6 | void *malloc_aligned(size_t size) |
swissChili | 8cfb7c4 | 2021-04-18 21:17:58 -0700 | [diff] [blame] | 7 | { |
swissChili | 708d4c4 | 2021-07-04 17:40:07 -0700 | [diff] [blame^] | 8 | // https://www.gnu.org/software/libc/manual/html_node/Aligned-Memory-Blocks.html |
| 9 | // On glibc malloc() and realloc() return 8-byte aligned addresses. |
| 10 | return malloc(size); |
swissChili | 8cfb7c4 | 2021-04-18 21:17:58 -0700 | [diff] [blame] | 11 | } |
| 12 | |
swissChili | 53472e8 | 2021-05-08 16:06:32 -0700 | [diff] [blame] | 13 | void *realloc_aligned(void *addr, size_t size) |
swissChili | 8cfb7c4 | 2021-04-18 21:17:58 -0700 | [diff] [blame] | 14 | { |
swissChili | 708d4c4 | 2021-07-04 17:40:07 -0700 | [diff] [blame^] | 15 | return realloc(addr, size); |
swissChili | 8cfb7c4 | 2021-04-18 21:17:58 -0700 | [diff] [blame] | 16 | } |
| 17 | |
swissChili | 53472e8 | 2021-05-08 16:06:32 -0700 | [diff] [blame] | 18 | void free_aligned(void *addr) |
swissChili | 8cfb7c4 | 2021-04-18 21:17:58 -0700 | [diff] [blame] | 19 | { |
swissChili | 708d4c4 | 2021-07-04 17:40:07 -0700 | [diff] [blame^] | 20 | free(addr); |
swissChili | 8cfb7c4 | 2021-04-18 21:17:58 -0700 | [diff] [blame] | 21 | } |
swissChili | f3e7f18 | 2021-04-20 13:57:22 -0700 | [diff] [blame] | 22 | |
swissChili | 53472e8 | 2021-05-08 16:06:32 -0700 | [diff] [blame] | 23 | void *link(dasm_State **Dst) |
swissChili | f3e7f18 | 2021-04-20 13:57:22 -0700 | [diff] [blame] | 24 | { |
| 25 | size_t size; |
| 26 | void *buf; |
| 27 | |
swissChili | 53472e8 | 2021-05-08 16:06:32 -0700 | [diff] [blame] | 28 | dasm_link(Dst, &size); |
| 29 | buf = mmap(0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, |
| 30 | 0); |
| 31 | dasm_encode(Dst, buf); |
swissChili | f3e7f18 | 2021-04-20 13:57:22 -0700 | [diff] [blame] | 32 | |
swissChili | 53472e8 | 2021-05-08 16:06:32 -0700 | [diff] [blame] | 33 | mprotect(buf, size, PROT_READ | PROT_EXEC); |
swissChili | f3e7f18 | 2021-04-20 13:57:22 -0700 | [diff] [blame] | 34 | return buf; |
| 35 | } |