Robert P. J. DAY says:
apparently, the patchset for gcc 4.2.1 applies properly to the
source for gcc 4.2.2 and gcc 4.2.3. so, if you want, you can simply
add support for those last two just by augmenting menuconfig and
adding a couple symlinks for those two directories. seems like a
cheap way to add a couple new versions.
1 --- uClibc-0.9.29.oorig/test/mmap/mmap2.c (revision 0)
2 +++ uClibc-0.9.29/test/mmap/mmap2.c (revision 18616)
4 +/* When trying to map /dev/mem with offset 0xFFFFF000 on the ARM platform, mmap
5 + * returns -EOVERFLOW.
7 + * Since off_t is defined as a long int and the sign bit is set in the address,
8 + * the shift operation shifts in ones instead of zeroes
9 + * from the left. This results the offset sent to the kernel function becomes
10 + * 0xFFFFFFFF instead of 0x000FFFFF with MMAP2_PAGE_SHIFT set to 12.
19 +#include <sys/mman.h>
21 +#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
22 + __LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0)
24 +#define MAP_SIZE 4096UL
25 +#define MAP_MASK (MAP_SIZE - 1)
27 +int main(int argc, char **argv) {
30 + off_t target = 0xfffff000;
31 + if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) FATAL;
32 + printf("/dev/mem opened.\n");
36 + map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
37 + fd, target & ~MAP_MASK);
38 + if(map_base == (void *) -1) FATAL;
39 + printf("Memory mapped at address %p.\n", map_base);
41 + if(munmap(map_base, MAP_SIZE) == -1) FATAL;
45 --- uClibc-0.9.29.oorig/libc/sysdeps/linux/arm/mmap.c (revision 18615)
46 +++ uClibc-0.9.29/libc/sysdeps/linux/arm/mmap.c (revision 18616)
47 @@ -27,7 +27,6 @@ __ptr_t mmap(__ptr_t addr, size_t len, i
49 #elif defined (__NR_mmap2)
50 #define __NR__mmap __NR_mmap2
52 #ifndef MMAP2_PAGE_SHIFT
53 # define MMAP2_PAGE_SHIFT 12
55 @@ -39,9 +38,17 @@ __ptr_t mmap(__ptr_t addr, size_t len, i
57 /* check if offset is page aligned */
58 if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1))
60 + __set_errno(EINVAL);
63 +#ifdef __USE_FILE_OFFSET64
64 + return (__ptr_t) _mmap (addr, len, prot, flags,
65 + fd,((__u_quad_t) offset >> MMAP2_PAGE_SHIFT));
67 return (__ptr_t) _mmap (addr, len, prot, flags,
68 - fd,(off_t) (offset >> MMAP2_PAGE_SHIFT));
69 + fd,((__u_long) offset >> MMAP2_PAGE_SHIFT));
72 #elif defined (__NR_mmap)
73 # define __NR__mmap __NR_mmap
74 --- uClibc-0.9.29.oorig/libc/sysdeps/linux/common/mmap64.c (revision 18615)
75 +++ uClibc-0.9.29/libc/sysdeps/linux/common/mmap64.c (revision 18616)
76 @@ -58,8 +58,13 @@ __ptr_t mmap64(__ptr_t addr, size_t len,
81 - return __syscall_mmap2(addr, len, prot, flags, fd, (off_t) (offset >> MMAP2_PAGE_SHIFT));
82 +#ifdef __USE_FILE_OFFSET64
83 + return __syscall_mmap2(addr, len, prot, flags,
84 + fd,((__u_quad_t)offset >> MMAP2_PAGE_SHIFT));
86 + return __syscall_mmap2(addr, len, prot, flags,
87 + fd,((__u_long)offset >> MMAP2_PAGE_SHIFT));