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-rw-r--r--examples/standalone/stubs.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/examples/standalone/stubs.c b/examples/standalone/stubs.c
index 0d62067e03..a8b7e14c04 100644
--- a/examples/standalone/stubs.c
+++ b/examples/standalone/stubs.c
@@ -240,6 +240,53 @@ gd_t *global_data;
" ld r10, [r10, %1]\n" \
" j [r10]\n" \
: : "i"(offsetof(gd_t, jt)), "i"(FO(x)) : "r10");
+#elif defined(CONFIG_XTENSA)
+/*
+ * Global data ptr is in global_data, jump table ptr is in jt.
+ * Windowed ABI: Jump just past 'entry' in target and adjust stack frame
+ * (extract stack frame size from target 'entry' instruction).
+ */
+
+static void **jt;
+
+#if defined(__XTENSA_CALL0_ABI__)
+#define EXPORT_FUNC(f, a, x, ...) \
+ asm volatile ( \
+" .extern jt\n" \
+" .globl " #x "\n" \
+" .align 4\n" \
+#x ":\n" \
+" l32i a8, %0, 0\n" \
+" l32i a8, a8, %1\n" \
+" jx a8\n" \
+ : : "r"(jt), "i" (FO(x)) : "a8");
+#elif defined(__XTENSA_WINDOWED_ABI__)
+#if XCHAL_HAVE_BE
+# define SFT "8"
+#else
+# define SFT "12"
+#endif
+#define EXPORT_FUNC(f, a, x, ...) \
+ asm volatile ( \
+" .extern jt\n" \
+" .globl " #x "\n" \
+" .align 4\n" \
+#x ":\n" \
+" entry sp, 16\n" \
+" l32i a8, %0, 0\n" \
+" l32i a8, a8, %1\n" \
+" l32i a9, a8, 0\n" \
+" extui a9, a9, " SFT ", 12\n" \
+" subx8 a9, a9, sp\n" \
+" movi a10, 16\n" \
+" sub a9, a10, a9\n" \
+" movsp sp, a9\n" \
+" addi a8, a8, 3\n" \
+" jx a8\n" \
+ : : "r"(jt), "i" (FO(x)) : "a8", "a9", "a10");
+#else
+#error Unsupported Xtensa ABI
+#endif
#else
/*" addi $sp, $sp, -24\n" \
" br $r16\n" \*/