1 files changed, 91 insertions, 0 deletions
diff --git a/toolchain/uClibc/patches/001-fix_mmap.patch b/toolchain/uClibc/patches/001-fix_mmap.patch
new file mode 100644
index 0000000..4775e8c
--- /dev/null
+++ b/toolchain/uClibc/patches/001-fix_mmap.patch
@@ -0,0 +1,91 @@
+--- 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