arm: boot: Support big-endian elfs
Support ARM big-endian ELF files in system-mode emulation. When loading an elf, determine the endianness mode expected by the elf, and set the relevant CPU state accordingly. With this, big-endian modes are now fully supported via system-mode LE, so there is no need to restrict the elf loading to the TARGET endianness so the ifdeffery on TARGET_WORDS_BIGENDIAN goes away. Signed-off-by: NPeter Crosthwaite <crosthwaite.peter@gmail.com> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> [PMM: fix typo in comments] Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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