In edk2, the division and shifting of 64-bit values are forbidden with C-language operators, because the compiler may generate intrinsic calls for them.
For example, clang-3.8 emits a call to "__umoddi3" for UDF_LOGICAL_SECTOR_SIZE % Media->BlockSize in PartitionInstallUdfChildHandles(), if PartitionDxe is built for IA32, which then fails to link. UDF_LOGICAL_SECTOR_SIZE has type UINT64, while EFI_BLOCK_IO_MEDIA.BlockSize has type UINT32(). Replace the % operator with a DivU64x32Remainder() call. Cc: Ard Biesheuvel <[email protected]> Cc: Eric Dong <[email protected]> Cc: Paulo Alcantara <[email protected]> Cc: Ruiyu Ni <[email protected]> Cc: Star Zeng <[email protected]> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Laszlo Ersek <[email protected]> --- MdeModulePkg/Universal/Disk/PartitionDxe/Udf.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/MdeModulePkg/Universal/Disk/PartitionDxe/Udf.c b/MdeModulePkg/Universal/Disk/PartitionDxe/Udf.c index c1d44809bfd2..c491ef25f47e 100644 --- a/MdeModulePkg/Universal/Disk/PartitionDxe/Udf.c +++ b/MdeModulePkg/Universal/Disk/PartitionDxe/Udf.c @@ -234,10 +234,11 @@ PartitionInstallUdfChildHandles ( IN EFI_BLOCK_IO_PROTOCOL *BlockIo, IN EFI_BLOCK_IO2_PROTOCOL *BlockIo2, IN EFI_DEVICE_PATH_PROTOCOL *DevicePath ) { + UINT32 RemainderByMediaBlockSize; EFI_STATUS Status; EFI_BLOCK_IO_MEDIA *Media; EFI_DEVICE_PATH_PROTOCOL *DevicePathNode; EFI_GUID *VendorDefinedGuid; EFI_GUID UdfDevPathGuid = EFI_UDF_DEVICE_PATH_GUID; @@ -246,11 +247,16 @@ PartitionInstallUdfChildHandles ( Media = BlockIo->Media; // // Check if UDF logical block size is multiple of underlying device block size // - if ((UDF_LOGICAL_SECTOR_SIZE % Media->BlockSize) != 0 || + DivU64x32Remainder ( + UDF_LOGICAL_SECTOR_SIZE, // Dividend + Media->BlockSize, // Divisor + &RemainderByMediaBlockSize // Remainder + ); + if (RemainderByMediaBlockSize != 0 || Media->BlockSize > UDF_LOGICAL_SECTOR_SIZE) { return EFI_NOT_FOUND; } DevicePathNode = DevicePath; -- 2.14.1.3.gb7cf6e02401b _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
