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arm: Switch to -mno-unaligned-access when supported by the compiler

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When we tell the compiler to optimize for ARMv7 (and ARMv6 for that
matter) it assumes a default of SCTRL.A being cleared and unaligned
accesses being allowed and fast at the hardware level.  We set this bit
and must pass along -mno-unaligned-access so that the compiler will
still breakdown accesses and not trigger a data abort.

To better help understand the requirements of the project with respect
to unaligned memory access, the
Documentation/unaligned-memory-access.txt file has been added as
doc/README.unaligned-memory-access.txt and is taken from the v3.14-rc1
tag of the kernel.

Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Mans Rullgard <mans@mansr.com>
Signed-off-by: Tom Rini <trini@ti.com>
This commit is contained in:
Tom Rini 2014-02-25 10:27:01 -05:00 • committed by Albert ARIBAUD
parent f503cc49a5
commit 1551df35f2
9 changed files with 248 additions and 138 deletions
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2
arch/arm/lib/interrupts.c
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@ -153,7 +153,7 @@ void do_prefetch_abort (struct pt_regs *pt_regs)
void do_data_abort (struct pt_regs *pt_regs)
{
printf ("data abort\n\n MAYBE you should read doc/README.arm-unaligned-accesses\n\n");
printf ("data abort\n");
show_regs (pt_regs);
bad_mode ();
}