diff options
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/standalone/stubs.c | 47 |
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" \*/ |