From 2577b1bc16124d0690b9dd268a9f582f80bdcd67 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Fri, 21 Apr 2017 17:24:46 -0400
Subject: [PATCH] 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.
---
 src/mman/mmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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)
 {