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Diffstat (limited to 'libc/sysdeps/linux/xtensa/windowspill.S')
-rw-r--r--libc/sysdeps/linux/xtensa/windowspill.S95
1 files changed, 95 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/xtensa/windowspill.S b/libc/sysdeps/linux/xtensa/windowspill.S
new file mode 100644
index 000000000..950c27b1b
--- /dev/null
+++ b/libc/sysdeps/linux/xtensa/windowspill.S
@@ -0,0 +1,95 @@
+/* Function to force register windows to the stack.
+ Copyright (C) 2005, 2007 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+ Boston, MA 02110-1301, USA. */
+
+#include <bits/xtensa-config.h>
+
+ .text
+ .align 4
+ .literal_position
+ .global __window_spill
+ .type __window_spill, @function
+__window_spill:
+ entry a1, 48
+ bbci.l a0, 31, .L4 // branch if called with call4
+ bbsi.l a0, 30, .L12 // branch if called with call12
+
+ /* Called with call8: touch register NUM_REGS-12 (4/20/52) */
+.L8:
+#if XCHAL_NUM_AREGS > 16
+ call12 1f
+ retw
+
+ .align 4
+1: _entry a1, 48 // touch NUM_REGS-24 (x/8/40)
+
+#if XCHAL_NUM_AREGS == 32
+ mov a8, a0
+ retw
+#else
+ _entry a1, 48 // touch NUM_REGS-36 (x/x/28)
+ mov a12, a0
+ _entry a1, 48 // touch NUM_REGS-48 (x/x/16)
+ mov a12, a0
+ _entry a1, 16 // touch NUM_REGS-60 (x/x/4)
+#endif
+#endif
+ mov a4, a0
+ retw
+
+ /* Called with call4: touch register NUM_REGS-8 (8/24/56) */
+.L4:
+#if XCHAL_NUM_AREGS == 16
+ mov a8, a0
+#else
+ call12 1f
+ retw
+
+ .align 4
+1: _entry a1, 48 // touch NUM_REGS-20 (x/12/44)
+ mov a12, a0
+#if XCHAL_NUM_AREGS > 32
+ _entry a1, 48 // touch NUM_REGS-32 (x/x/32)
+ mov a12, a0
+ _entry a1, 48 // touch NUM_REGS-44 (x/x/20)
+ mov a12, a0
+ _entry a1, 48 // touch NUM_REGS-56 (x/x/8)
+ mov a8, a0
+#endif
+#endif
+ retw
+
+ /* Called with call12: touch register NUM_REGS-16 (x/16/48) */
+.L12:
+#if XCHAL_NUM_AREGS > 16
+ call12 1f
+ retw
+
+ .align 4
+1: _entry a1, 48 // touch NUM_REGS-28 (x/4/36)
+#if XCHAL_NUM_AREGS == 32
+ mov a4, a0
+#else
+ mov a12, a0
+ _entry a1, 48 // touch NUM_REGS-40 (x/x/24)
+ mov a12, a0
+ _entry a1, 48 // touch NUM_REGS-52 (x/x/12)
+ mov a12, a0
+#endif
+#endif
+ retw