1 files changed, 48 insertions, 0 deletions

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index ebc135bda921..fb64469ca8f0 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -385,6 +385,54 @@ config FAST_SYSCALL_SPILL_REGISTERS
 
           If unsure, say N.
 
+config USER_ABI_CALL0
+        bool
+
+choice
+        prompt "Userspace ABI"
+        default USER_ABI_DEFAULT
+        help
+          Select supported userspace ABI.
+
+          If unsure, choose the default ABI.
+
+config USER_ABI_DEFAULT
+        bool "Default ABI only"
+        help
+          Assume default userspace ABI. For XEA2 cores it is windowed ABI.
+          call0 ABI binaries may be run on such kernel, but signal delivery
+          will not work correctly for them.
+
+config USER_ABI_CALL0_ONLY
+        bool "Call0 ABI only"
+        select USER_ABI_CALL0
+        help
+          Select this option to support only call0 ABI in userspace.
+          Windowed ABI binaries will crash with a segfault caused by
+          an illegal instruction exception on the first 'entry' opcode.
+
+          Choose this option if you're planning to run only user code
+          built with call0 ABI.
+
+config USER_ABI_CALL0_PROBE
+        bool "Support both windowed and call0 ABI by probing"
+        select USER_ABI_CALL0
+        help
+          Select this option to support both windowed and call0 userspace
+          ABIs. When enabled all processes are started with PS.WOE disabled
+          and a fast user exception handler for an illegal instruction is
+          used to turn on PS.WOE bit on the first 'entry' opcode executed by
+          the userspace.
+
+          This option should be enabled for the kernel that must support
+          both call0 and windowed ABIs in userspace at the same time.
+
+          Note that Xtensa ISA does not guarantee that entry opcode will
+          raise an illegal instruction exception on cores with XEA2 when
+          PS.WOE is disabled, check whether the target core supports it.
+
+endchoice
+
 endmenu
 
 config XTENSA_CALIBRATE_CCOUNT