Comment 2 for bug 1669879
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| Roger W. Cover (rwcover) wrote RE: [Bug 1669879] Re: The built-in memcpy uses unaligned reads/writes and this crashes my ARM-A5 processor. | #2 |
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Greetings,
I was not using the -mno-unaligned- access flag. That flag also prevents the compiler from generating the incorrect inline code.
I was not aware the -mno-unaligned- access flag existed. Sorry for the trouble. I will be using this flag from now on.
Regards,
Roger
-----Original Message-----
From: <email address hidden> [mailto:<email address hidden>] On Behalf Of Prakhar Bahuguna
Sent: Monday, March 06, 2017 2:32 AM
To: Roger Cover
Subject: [Bug 1669879] Re: The built-in memcpy uses unaligned reads/writes and this crashes my ARM-A5 processor.
Hi Roger, can I confirm if you're compiling with the -mno-unaligned- access flag? By default GCC only disallows unaligned memory accesses for pre-ARMv6, all ARMv6-M and for ARMv8-M Baseline architectures, so in the case of your Cortex-A5 it may generate unaligned accesses unless you explicitly disable it.
If the issue persists even with the -mno-unaligned-
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Title:
The built-in memcpy uses unaligned reads/writes and this crashes my
ARM-A5 processor.
Status in GNU ARM Embedded Toolchain:
New
Bug description:
I am using an Atmel SAMA5D35 processor. It is an ARM Cortex-A5. The unaligned reads and writes inserted by the compiler for memcpy() calls are not supported by this processor. The processor experiences a memory access fault as a result.
I have worked around the problem by using the -fno-builtin-memcpy argument on the command line. I wanted to report the problem so it can be fixed, however.
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