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Poschwatta
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The attached patch adds support for compiling arm uClibc as pure Thumb code.
This is needed because some recent ARM codes do not implement traditional ARM
mode. Specifically:
* Cortex-M1 - An extremely minimal FPGA based core that only implements
Thumb-1 (aka ARMv6-M).
* Cortex-M3 - A Thumb-2 only ARMv7-M core.
Most of uClibc already builds in Thumb mode, all that is left are a handful of
assembly bits.
Tested on arm-uclinuxeabi.
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This patch fixes some of the ARM EABI code to be interworking-safe, using
bx where appropriate. (This code went in around the same time as the
Thumb patches, hence not being fixed by those patches.)
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The patch fixes up the .align directives to '2' (i.e. a multiple
of 4) not '4' (a multiple of 16 - apparently an error since it seems
to be unnecessary, there is no advantage here in cache line alignment).
this is an arm "feature" ... the value given to .align is not in bytes:
.align 4 in arm means .align 2 ^ 4
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missing headers, other jump relocs removed
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Hide __syscall_error from outside libc.
From Peter Mazinger.
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