From: Rich Felker <dalias@aerifal.cx>
Date: Fri, 21 Apr 2017 21:24:46 +0000 (-0400)
Subject: allow full-range file offsets to mmap on archs with 64-bit syscall args
X-Git-Tag: v1.1.17~75
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=2577b1bc16124d0690b9dd268a9f582f80bdcd67;p=oweals%2Fmusl.git

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

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.
---

diff --git a/src/mman/mmap.c b/src/mman/mmap.c
index b85f25ca..19caadbd 100644
--- a/src/mman/mmap.c
+++ b/src/mman/mmap.c
@@ -10,7 +10,7 @@ static void dummy(void) { }
 weak_alias(dummy, __vm_wait);
 
 #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)
 {