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Diffstat (limited to 'toolchain/uClibc/patches-0.9.29/001-fix_mmap.patch')
-rw-r--r--toolchain/uClibc/patches-0.9.29/001-fix_mmap.patch91
1 files changed, 91 insertions, 0 deletions
diff --git a/toolchain/uClibc/patches-0.9.29/001-fix_mmap.patch b/toolchain/uClibc/patches-0.9.29/001-fix_mmap.patch
new file mode 100644
index 0000000..38cf60a
--- /dev/null
+++ b/toolchain/uClibc/patches-0.9.29/001-fix_mmap.patch
@@ -0,0 +1,91 @@
+--- /dev/null
++++ b/test/mmap/mmap2.c
+@@ -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;
++}
+--- a/libc/sysdeps/linux/arm/mmap.c
++++ b/libc/sysdeps/linux/arm/mmap.c
+@@ -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
+--- a/libc/sysdeps/linux/common/mmap64.c
++++ b/libc/sysdeps/linux/common/mmap64.c
+@@ -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