From e78a0f58f23347c822c182d1c01f6eb9b9866d60 Mon Sep 17 00:00:00 2001 From: Max Filippov Date: Wed, 16 Sep 2015 01:49:49 +0300 Subject: xtensa: support call0 ABI Most changes are mechanical replacement of 'retw' instruction with 'abi_ret' macro, defined to 'retw' or 'ret' according to ABI. Assembly code that makes calls is duplicated for call0 ABI with changed register numbers for parameters/return value and call instruction. 'entry' instructions are replaced with 'abi_entry' macro. More interesting changes: - non-leaf assembly functions (e.g. _dl_tlsdesc_dynamic, _dl_linux_resolve, SYSCALL_ERROR_HANDLER, PSEUDO) now need to preserve registers around intermediate calls they make, use temporary stack frame for that; - setjmp/longjmp only need to save and restore return address, stack pointer and callee-saved registers in the jmpbuf; - __clone and syscall functions had hardcoded offsets to parameter passed on stack, on call0 ABI they don't need stack frame, so the offset is different. Replace these offsets with FRAMESIZE macro. Signed-off-by: Max Filippov --- libc/sysdeps/linux/xtensa/__longjmp.S | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'libc/sysdeps/linux/xtensa/__longjmp.S') diff --git a/libc/sysdeps/linux/xtensa/__longjmp.S b/libc/sysdeps/linux/xtensa/__longjmp.S index 4d55906db..acc0b4ff2 100644 --- a/libc/sysdeps/linux/xtensa/__longjmp.S +++ b/libc/sysdeps/linux/xtensa/__longjmp.S @@ -48,6 +48,7 @@ ENTRY (__longjmp) +#if defined(__XTENSA_WINDOWED_ABI__) /* Invalidate all but the current window. Reading and writing special registers WINDOWBASE and WINDOWSTART are privileged operations, so user processes must call the @@ -120,6 +121,22 @@ ENTRY (__longjmp) movnez a2, a3, a3 retw +#elif defined(__XTENSA_CALL0_ABI__) + l32i a0, a2, 0 + l32i a1, a2, 4 + l32i a12, a2, 8 + l32i a13, a2, 12 + l32i a14, a2, 16 + l32i a15, a2, 20 + + /* Return v ? v : 1. */ + movi a2, 1 + movnez a2, a3, a3 + + ret +#else +#error Unsupported Xtensa ABI +#endif END (__longjmp) libc_hidden_def (__longjmp) -- cgit v1.2.3