diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2015-09-16 01:49:49 +0300 |
|---|---|---|
| committer | Waldemar Brodkorb <wbx@openadk.org> | 2015-10-08 20:31:24 +0200 |
| commit | e78a0f58f23347c822c182d1c01f6eb9b9866d60 (patch) | |
| tree | 723cfbcd2411d889fb4956adb7f2d11a6d766050 /libc/sysdeps/linux/xtensa/setjmp.S | |
| parent | 9fae2ad9937279c9f7f40975ac14cb7b57f4a36d (diff) | |
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 <jcmvbkbc@gmail.com>
Diffstat (limited to 'libc/sysdeps/linux/xtensa/setjmp.S')
| -rw-r--r-- | libc/sysdeps/linux/xtensa/setjmp.S | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/xtensa/setjmp.S b/libc/sysdeps/linux/xtensa/setjmp.S index bf4691294..862bf6729 100644 --- a/libc/sysdeps/linux/xtensa/setjmp.S +++ b/libc/sysdeps/linux/xtensa/setjmp.S @@ -88,6 +88,7 @@ END (setjmp) ENTRY (__sigsetjmp) 1: +#if defined(__XTENSA_WINDOWED_ABI__) /* Flush registers. */ movi a4, __window_spill callx4 a4 @@ -146,6 +147,22 @@ ENTRY (__sigsetjmp) callx4 a3 mov a2, a6 retw +#elif defined(__XTENSA_CALL0_ABI__) + s32i a0, a2, 0 + s32i a1, a2, 4 + s32i a12, a2, 8 + s32i a13, a2, 12 + s32i a14, a2, 16 + s32i a15, a2, 20 + mov a12, a2 + movi a0, __sigjmp_save + callx0 a0 + l32i a0, a12, 0 + l32i a12, a12, 8 + ret +#else +#error Unsupported Xtensa ABI +#endif END(__sigsetjmp) weak_extern(_setjmp) |