http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54760
Bug #: 54760
Summary: [SH] Add __builtin_thread_pointer,
__builtin_set_thread_pointer
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
AssignedTo: olege...@gcc.gnu.org
ReportedBy: olege...@gcc.gnu.org
Target: sh*-*-*
SH normally uses GBR to store the address of the thread control block (TCB).
Other targets have __builtin_thread_pointer and __builtin_set_thread_pointer to
modify such registers. It has been proposed to make these machine independent
builtins:
http://gcc.gnu.org/ml/gcc-patches/2012-07/msg00428.html
but so far this has not made it into mainline. In any case the builtin
functions should be added for SH to get/set the GBR. Moreover, code that
accesses variables in the TCB like
struct tcb
{
int a, b, c, d;
};
int test (void)
{
return ((tcb*)__builtin_thread_pointer ())->c;
}
ideally would result in:
rts
mov.l @(8,gbr),r0
