force program header alignment to be smaller than 32kbytes

GCC 5 and newer seem to choose higher alignment values in elf program
headers than older versions. This causes issues when doing address
translations with areas which have lower alignment: It moves the base
address outside of memory base addresse (e.g. TCML memory base address
is aligned to 32kiB).

With 4K we use a safe and sensible value for alignment. With that all
elf program headers are aligned with 0x1000.
  $ readelf -l debug/hello_world.elf

  Elf file type is EXEC (Executable file)
  Entry point 0x1fff8311
  There are 3 program headers, starting at offset 52

  Program Headers:
    Type           Offset   VirtAddr   PhysAddr   FileSiz MemSiz  Flg Align
    LOAD           0x001000 0x1fff8000 0x1fff8000 0x00240 0x00240 R   0x1000
    LOAD           0x001240 0x1fff8240 0x1fff8240 0x03904 0x03904 RWE 0x1000
    LOAD           0x005000 0x20000000 0x1fffbb44 0x00070 0x059b0 RW  0x1000

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>

0 files changed, 0 insertions, 0 deletions