https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115360
Bug ID: 115360
Summary: cmse_nonsecure_call wrapper missing STT_FUNCTION
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: avieira at gcc dot gnu.org
Target Milestone: ---
The Arm ABI requires a linker to handle calls to 'distant' functions by
inserting a wrapper veneer, or trampoline. Such functions need to be given
permission to do this by marking them as type STT_FUNC (so that it is clear
that there is a scratch register available for use within the veneer).
Unfortunately, __gnu_cmse_nonesecure_call is not marked at all (defaulting to
STT_NOTYPE). A separate bug in GNU ld means this problem is not diagnosed at
link time, and the linker silently picks the wrong veneer type into the
bargain, leading to run-time crashes when the CPU is asked to switch into Arm
state on a thumb-only processor.
