diff options
Diffstat (limited to 'libgloss/sparc_leon/regwin_slow.S')
| -rw-r--r-- | libgloss/sparc_leon/regwin_slow.S | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/libgloss/sparc_leon/regwin_slow.S b/libgloss/sparc_leon/regwin_slow.S new file mode 100644 index 000000000..619183428 --- /dev/null +++ b/libgloss/sparc_leon/regwin_slow.S @@ -0,0 +1,135 @@ +/* + * Copyright (c) 2011 Aeroflex Gaisler + * + * BSD license: + * + * Permission is hereby granted, free of charge, to any person obtaining a copy + * of this software and associated documentation files (the "Software"), to deal + * in the Software without restriction, including without limitation the rights + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN + * THE SOFTWARE. + */ + + +#include <asm-leon/leon.h> +#include <asm-leon/leonstack.h> +#include <asm-leon/asmmacro.h> + + .seg "text" + + +/* Number of register windows */ + .global _nwindows_min1, _nwindows + + ! Window overflow trap handler on save. + ! Touches %g1 + /* ------- */ + .weak _window_overflow + .set _window_overflow,__window_overflow + .weak _window_overflow_svt + .set _window_overflow_svt,__window_overflow_svt + /* ------- */ + !.global _window_overflow,_window_overflow_svt + .global __window_overflow_rettseq,__window_overflow_rettseq_ret,__window_overflow_slow1 + +__window_overflow_svt: +__window_overflow: +#ifndef _FLAT +__window_overflow_rettseq: + mov %wim, %l3 ! Calculate next WIM + mov %g1, %l7 + srl %l3, 1, %g1 + +__window_overflow_rettseq_ret: + sethi %hi(_nwindows_min1), %l4 ! NWINDOWS-1 + ld [%l4+%lo(_nwindows_min1)], %l4 + + sll %l3, %l4 , %l4 + or %l4, %g1, %g1 + + save ! Get into window to be saved. + mov %g1, %wim + nop; nop; nop + std %l0, [%sp + 0]; + std %l2, [%sp + 8]; + std %l4, [%sp + 16]; + std %l6, [%sp + 24]; + std %i0, [%sp + 32]; + std %i2, [%sp + 40]; + std %i4, [%sp + 48]; + std %i6, [%sp + 56]; + restore ! Go back to trap window. + mov %l7, %g1 + + jmp %l1 ! Re-execute save. + rett %l2 + nop + +__window_overflow_slow1: ! space for possible stackcheck patch + nop + nop +#else + ta 0 ! halt +__window_overflow_rettseq: +__window_overflow_rettseq_ret: +__window_overflow_slow1: + nop + nop + nop +#endif + + /* Window underflow trap handler on restore. */ + + ! Touches %g1 + /* ------- */ + .weak _window_underflow + .set _window_underflow,__window_underflow + .weak _window_underflow_svt + .set _window_underflow_svt,__window_underflow_svt + /* ------- */ + !.global _window_underflow,_window_underflow_svt + +__window_underflow_svt: +__window_underflow: +#ifndef _FLAT + mov %wim, %l3 ! Calculate next WIM + sll %l3, 1, %l4 + + sethi %hi(_nwindows_min1), %l5 ! NWINDOWS-1 + ld [%l5+%lo(_nwindows_min1)], %l5 + + srl %l3, %l5, %l5 + or %l5, %l4, %l5 + mov %l5, %wim + nop; nop; nop + restore ! Two restores to get into the + restore ! window to restore + ldd [%sp + 0], %l0; ! Restore window from the stack + ldd [%sp + 8], %l2; + ldd [%sp + 16], %l4; + ldd [%sp + 24], %l6; + ldd [%sp + 32], %i0; + ldd [%sp + 40], %i2; + ldd [%sp + 48], %i4; + ldd [%sp + 56], %i6; + save ! Get back to the trap window. + save + jmp %l1 ! Re-execute restore. + rett %l2 +#else + ta 0 ! halt +#endif + + |