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authorMax Filippov <jcmvbkbc@gmail.com>2015-09-16 01:49:49 +0300
committerWaldemar Brodkorb <wbx@openadk.org>2015-10-08 20:31:24 +0200
commite78a0f58f23347c822c182d1c01f6eb9b9866d60 (patch)
tree723cfbcd2411d889fb4956adb7f2d11a6d766050 /libc/sysdeps/linux/xtensa/syscall.S
parent9fae2ad9937279c9f7f40975ac14cb7b57f4a36d (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/syscall.S')
-rw-r--r--libc/sysdeps/linux/xtensa/syscall.S4
1 files changed, 2 insertions, 2 deletions
diff --git a/libc/sysdeps/linux/xtensa/syscall.S b/libc/sysdeps/linux/xtensa/syscall.S
index 0e1a5d0be..790a8d018 100644
--- a/libc/sysdeps/linux/xtensa/syscall.S
+++ b/libc/sysdeps/linux/xtensa/syscall.S
@@ -26,7 +26,7 @@
*/
ENTRY (syscall)
- l32i a9, a1, 16 /* load extra argument from stack */
+ l32i a9, a1, FRAMESIZE/* load extra argument from stack */
mov a8, a7
mov a7, a3 /* preserve a3 in a7 */
mov a3, a4
@@ -37,5 +37,5 @@ ENTRY (syscall)
movi a4, -4095
bgeu a2, a4, SYSCALL_ERROR_LABEL
.Lpseudo_end:
- retw
+ abi_ret
PSEUDO_END (syscall)