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allow full-range file offsets to mmap on archs with 64-bit syscall args

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normally 32-bit archs use the mmap2 syscall and are limited to an
offset of 2^32 pages. however some 32-bit archs (mainly ILP32-on-64
ones like x32) have 64-bit syscall argument slots and thus can accept
the full range. don't artifically limit them.
This commit is contained in:
Rich Felker 2017-04-21 17:24:46 -04:00
parent b3751c3282
commit 2577b1bc16
1 changed files with 1 additions and 1 deletions
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2
src/mman/mmap.c
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@ -10,7 +10,7 @@ static void dummy(void) { }
weak_alias(dummy, __vm_wait); weak_alias(dummy, __vm_wait);
#define UNIT SYSCALL_MMAP2_UNIT #define UNIT SYSCALL_MMAP2_UNIT
#define OFF_MASK ((-0x2000ULL << (8*sizeof(long)-1)) | (UNIT-1)) #define OFF_MASK ((-0x2000ULL << (8*sizeof(syscall_arg_t)-1)) | (UNIT-1))
void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off) void *__mmap(void *start, size_t len, int prot, int flags, int fd, off_t off)
{ {