mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-12-27 11:32:26 +02:00
b26b6755df
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10010 3c298f89-4303-0410-b956-a3cf2f4a3e73
92 lines
3.0 KiB
Diff
92 lines
3.0 KiB
Diff
--- uClibc-0.9.29.oorig/test/mmap/mmap2.c (revision 0)
|
|
+++ uClibc-0.9.29/test/mmap/mmap2.c (revision 18616)
|
|
@@ -0,0 +1,41 @@
|
|
+/* When trying to map /dev/mem with offset 0xFFFFF000 on the ARM platform, mmap
|
|
+ * returns -EOVERFLOW.
|
|
+ *
|
|
+ * Since off_t is defined as a long int and the sign bit is set in the address,
|
|
+ * the shift operation shifts in ones instead of zeroes
|
|
+ * from the left. This results the offset sent to the kernel function becomes
|
|
+ * 0xFFFFFFFF instead of 0x000FFFFF with MMAP2_PAGE_SHIFT set to 12.
|
|
+ */
|
|
+
|
|
+#include <unistd.h>
|
|
+#include <stdio.h>
|
|
+#include <stdlib.h>
|
|
+#include <string.h>
|
|
+#include <errno.h>
|
|
+#include <fcntl.h>
|
|
+#include <sys/mman.h>
|
|
+
|
|
+#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
|
|
+ __LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0)
|
|
+
|
|
+#define MAP_SIZE 4096UL
|
|
+#define MAP_MASK (MAP_SIZE - 1)
|
|
+
|
|
+int main(int argc, char **argv) {
|
|
+ void* map_base = 0;
|
|
+ int fd;
|
|
+ off_t target = 0xfffff000;
|
|
+ if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) FATAL;
|
|
+ printf("/dev/mem opened.\n");
|
|
+ fflush(stdout);
|
|
+
|
|
+ /* Map one page */
|
|
+ map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
|
|
+ fd, target & ~MAP_MASK);
|
|
+ if(map_base == (void *) -1) FATAL;
|
|
+ printf("Memory mapped at address %p.\n", map_base);
|
|
+ fflush(stdout);
|
|
+ if(munmap(map_base, MAP_SIZE) == -1) FATAL;
|
|
+ close(fd);
|
|
+ return 0;
|
|
+}
|
|
--- uClibc-0.9.29.oorig/libc/sysdeps/linux/arm/mmap.c (revision 18615)
|
|
+++ uClibc-0.9.29/libc/sysdeps/linux/arm/mmap.c (revision 18616)
|
|
@@ -27,7 +27,6 @@ __ptr_t mmap(__ptr_t addr, size_t len, i
|
|
|
|
#elif defined (__NR_mmap2)
|
|
#define __NR__mmap __NR_mmap2
|
|
-
|
|
#ifndef MMAP2_PAGE_SHIFT
|
|
# define MMAP2_PAGE_SHIFT 12
|
|
#endif
|
|
@@ -39,9 +38,17 @@ __ptr_t mmap(__ptr_t addr, size_t len, i
|
|
{
|
|
/* check if offset is page aligned */
|
|
if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))
|
|
+ {
|
|
+ __set_errno(EINVAL);
|
|
return MAP_FAILED;
|
|
+ }
|
|
+#ifdef __USE_FILE_OFFSET64
|
|
+ return (__ptr_t) _mmap (addr, len, prot, flags,
|
|
+ fd,((__u_quad_t) offset >> MMAP2_PAGE_SHIFT));
|
|
+#else
|
|
return (__ptr_t) _mmap (addr, len, prot, flags,
|
|
- fd,(off_t) (offset >> MMAP2_PAGE_SHIFT));
|
|
+ fd,((__u_long) offset >> MMAP2_PAGE_SHIFT));
|
|
+#endif
|
|
}
|
|
#elif defined (__NR_mmap)
|
|
# define __NR__mmap __NR_mmap
|
|
--- uClibc-0.9.29.oorig/libc/sysdeps/linux/common/mmap64.c (revision 18615)
|
|
+++ uClibc-0.9.29/libc/sysdeps/linux/common/mmap64.c (revision 18616)
|
|
@@ -58,8 +58,13 @@ __ptr_t mmap64(__ptr_t addr, size_t len,
|
|
__set_errno(EINVAL);
|
|
return MAP_FAILED;
|
|
}
|
|
-
|
|
- return __syscall_mmap2(addr, len, prot, flags, fd, (off_t) (offset >> MMAP2_PAGE_SHIFT));
|
|
+#ifdef __USE_FILE_OFFSET64
|
|
+ return __syscall_mmap2(addr, len, prot, flags,
|
|
+ fd,((__u_quad_t)offset >> MMAP2_PAGE_SHIFT));
|
|
+#else
|
|
+ return __syscall_mmap2(addr, len, prot, flags,
|
|
+ fd,((__u_long)offset >> MMAP2_PAGE_SHIFT));
|
|
+#endif
|
|
}
|
|
|
|
# endif
|