| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> |
| 3 | * |
| 4 | * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. |
| 5 | */ |
| 6 | /* Massivly hacked up for uClibc by Erik Andersen */ |
| 7 | |
| 8 | #include <_lfs_64.h> |
| 9 | |
| 10 | #ifdef __UCLIBC_HAS_LFS__ |
| 11 | |
| 12 | #include <errno.h> |
| 13 | #include <stdint.h> |
| 14 | #include <unistd.h> |
| 15 | #include <sys/mman.h> |
| 16 | #include <sys/syscall.h> |
| 17 | #include <bits/uClibc_page.h> |
| 18 | |
| 19 | |
| 20 | # if !defined __NR_mmap2 |
| 21 | |
| 22 | /* |
| 23 | * This version is a stub that just chops off everything at the mmap 32 bit |
| 24 | * mmap() address space... You will probably need to add in an arch specific |
| 25 | * implementation to override this as there is not a generic way for me to |
| 26 | * implement this particular syscall if your arch lacks _syscall6... |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | __ptr_t mmap64(__ptr_t addr, size_t len, int prot, int flags, int fd, __off64_t offset) |
| 31 | { |
| 32 | if (offset != (off_t) offset || |
| 33 | (offset + len) != (off_t) (offset + len)) { |
| 34 | __set_errno(EINVAL); |
| 35 | return MAP_FAILED; |
| 36 | } |
| 37 | |
| 38 | return mmap(addr, len, prot, flags, fd, (off_t) offset); |
| 39 | } |
| 40 | |
| 41 | # else |
| 42 | |
| 43 | /* Some architectures always use 12 as page shift for mmap2() eventhough the |
| 44 | * real PAGE_SHIFT != 12. Other architectures use the same value as |
| 45 | * PAGE_SHIFT... |
| 46 | */ |
| 47 | # ifndef MMAP2_PAGE_SHIFT |
| 48 | # define MMAP2_PAGE_SHIFT 12 |
| 49 | # endif |
| 50 | |
| 51 | __ptr_t mmap64(__ptr_t addr, size_t len, int prot, int flags, int fd, __off64_t offset) |
| 52 | { |
| 53 | /* |
| 54 | * Some arches check the size in INLINE_SYSCALL() and barf if it's |
| 55 | * too big (i.e. a 64bit value getting truncated to 32bit). |
| 56 | */ |
| 57 | # if __WORDSIZE == 32 |
| 58 | uint32_t sysoff; |
| 59 | # else |
| 60 | uint64_t sysoff; |
| 61 | # endif |
| 62 | |
| 63 | if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1)) { |
| 64 | __set_errno(EINVAL); |
| 65 | return MAP_FAILED; |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * We know __off64_t is always a signed 64-bit type, but need things |
| 70 | * to be unsigned before doing the shift. If it isn't, we might |
| 71 | * sign extend things and pass in the wrong value. So cast it to |
| 72 | * an unsigned 64-bit value before doing the shift. |
| 73 | */ |
| 74 | sysoff = (uint64_t)offset >> MMAP2_PAGE_SHIFT; |
| 75 | |
| 76 | return (__ptr_t) INLINE_SYSCALL(mmap2, 6, addr, len, prot, flags, fd, sysoff); |
| 77 | } |
| 78 | |
| 79 | # endif |
| 80 | #endif /* __UCLIBC_HAS_LFS__ */ |