On 2016-09-21 12:18 PM, Richard Earnshaw (lists) wrote:
On 21/09/16 17:10, drwho wrote:
Hello,
I am getting a hard exception fault when doing a divide on a int64_t on
a cortex-m3. Looking at the lss file, the compiler is doing the int64
divide using __aeabi_ldivmod which uses the instruction movlt. movlt is
not supported by the cortex-m3. How do I get gcc to use the right
version of __aeabi_ldivmod?
movlt is perfectly legal on Cortex-m3 in IT blocks.
Richard, movlt is not listed in the datasheet for the mcu....movt is
listed on pg76....http://www.atmel.com/images/11011s.pdf
If I change the -march=armv6-m and -mcpu=cortex-m0 the code runs (and
__aeabi_ldivmod does not contain movlt)
CFLAGS = -MMD -MP -march=armv7-m -mcpu=cortex-m3 -mfix-cortex-m3-ldrd
-mthumb -Wall -O3
LDFLAG = -march=armv7-m -mcpu=cortex-m3 -mfix-cortex-m3-ldrd -mthumb
-nostartfiles -Wl,--no-warn-mismatch -Wl,-dT sam3n.ld
You might want to remove the -Wl,--no-warn-mismatch and check that your
input files are correct. This is a sledgehammer that disables a lot of
validation during linking.
Will do, thanks,
Jon
