On Thu, Apr 5, 2018 at 12:00 AM, Thomas Munro <thomas.mu...@enterprisedb.com> wrote: > ... trying to figure out how to detect the instruction portably using SIGILL > ...
Ahh, OpenSSL's armcap.c shows how to do this. You need to siglongjmp() out of there. Here's a patch that does it that way. Isn't this better? I tested this on a Linux ARM system that has the instruction, and I put a kill(getpid(), SIGILL) in there to test the negative case because I don't have access to an ARM system without the instruction. I don't have a FreeBSD/ARM system to test on either but I checked that the flow control technique works fine on FreeBSD on another architecture when it hits an instruction it doesn't support. -- Thomas Munro http://www.enterprisedb.com
0001-Use-a-portable-way-to-detect-ARMv8-CRC32-hardware.patch
Description: Binary data
