I observed strange cmsisDAP behavior when building openFPGALoader with
Clang/musl in release mode: CmsisDAP:display_info() shows the correct
hardware capability that supports JTAG,
...
firmware version : 0254
hardware capabilities : 13
SWO trace buffer size : NA
...
but the detection of JTAG fails in the constructor with a strange
response sequence,
Hardware cap 00 01 00
JTAG init failed with: JTAG is not supported by the probe
With some digging, it's found that the CmsisDAP::xfer() method without
an instruction parameter may be called by the constructor with a rx_buff
pointer overlapping with _ll_buffer, for which memmove() instead of
memcpy() should be used. The behavior of memcpy() is undefined when dst
and src overlap.
Fixes: 53c5d35da6 ("add cmsis dap (hid) support")
Signed-off-by: Yao Zi <ziyao@disroot.org>
Gwenhael Goavec-Merou
Yao Zi
Alexey Starikovskiy
Benjamin Koch
Vegard Storheil Eriksen