Add DWARF 2 CFA column which tracks the return address from a signal
handler context. This value must not correspond to a hard register
and must be out of the range of DWARF_FRAME_REGNUM().
gcc/
* config/arc/arc.h (DWARF_FRAME_REGNUM): Update definition.
(DWARF_FRAME_RETURN_COLUMN): Use RETURN_ADDR_REGNUM macro.
(INCOMING_RETURN_ADDR_RTX): Likewise.
(DWARF_ALT_FRAME_RETURN_COLUMN): Define.
gcc/testsuite/
* gcc.target/arc/cancel-1.c: New file.
libgcc/
* config/arc/linux-unwind.h (arc_fallback_frame_state): Use
DWARF_ALT_FRAME_RETURN_COLUMN macro.
Signed-off-by: Claudiu Zissulescu <claziss@synopsys.com>
68a650ba57