Followup question:
Thanks to Ian's suggestion, gas is working. The gcc build gives me the
following errors when I configure it big-endian:
tools/gcc/libgcc/../gcc/libgcc2.c: In function __mulsc3’:
tools/gcc/libgcc/../gcc/libgcc2.c:1826: internal compiler error: in
gen_rtx_SUBREG, at emit-rtl.c:777
The processor is 64-bit, and the little-endian version of gcc works happily.
Suggestions?
Thanks.
--jeff
On 11/5/2010 7:56 PM, Ian Lance Taylor wrote:
Jeff Kenton <jeffrey.kenton@xxxxxxxxxxx> writes:
I have a little-endian gcc tool chain (gcc, gas, ld, ...) for a custom
processor. The folks who built the tools are gone from the company.
My job is to produce a big-endian set of tools (the processor can run
either way) and need some hints. I have gotten gcc to do what looks
OK by setting BYTES_BIG_ENDIAN, etc. but am having no success finding
the right tweaks for gas. Any clues? Any overall strategy?
For gas look at gas/config/tc-CPU.h. Set TARGET_BYTES_BIG_ENDIAN. Then
figure out what BFD target you are using. Let's say it's
bfd/elf32-CPU.c. Look in that file for TARGET_LITTLE_SYM and
TARGET_LITTLE_NAME. Change them to TARGET_BIG_SYM and TARGET_BIG_NAME.
If it's not ELF, you'll have to do something else.
Ian
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= Jeff Kenton http://home.comcast.net/~jeffrey.kenton =
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