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| author | Chris Zankel <chris@zankel.net> | 2016-08-10 18:36:43 +0300 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2016-08-15 18:46:38 -0400 |
| commit | de5e5cea022ab44006ff1edf45a39f0943fb9dff (patch) | |
| tree | 8dbaf0260ec277035ecb514d8437bd4cd05de70e /examples/standalone | |
| parent | f225d39d30935c3d27271bee676ef554fa9b0f3c (diff) | |
xtensa: add support for the xtensa processor architecture [1/2]
The Xtensa processor architecture is a configurable, extensible,
and synthesizable 32-bit RISC processor core provided by Cadence.
This is the first part of the basic architecture port with changes to
common files. The 'arch/xtensa' directory, and boards and additional
drivers will be in separate commits.
Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'examples/standalone')
| -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" \*/ |