diff options
Diffstat (limited to 'libgloss/sparc_leon/contextswitch_asm.S')
| -rw-r--r-- | libgloss/sparc_leon/contextswitch_asm.S | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/libgloss/sparc_leon/contextswitch_asm.S b/libgloss/sparc_leon/contextswitch_asm.S new file mode 100644 index 000000000..755efa2c7 --- /dev/null +++ b/libgloss/sparc_leon/contextswitch_asm.S @@ -0,0 +1,101 @@ +/* + * 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/contextswitch.h> +#include <asm-leon/winmacros.h> + +/* This asm code relies on the following offsets (setjmp.h): +#define THREAD_JB_SP 0 +#define THREAD_JB_PC 1 +#define THREAD_JB_PSR 8 +#define THREAD_JB_WIM 9 */ + + /* Number of register windows */ + .global _nwindows_min1, _nwindows + + .text + .global _switch_to +_switch_to: + +#ifndef _FLAT + !mov %o0,%i0 /* propagate env on restore */ + !mov %o1,%i1 /* propagate val on restore */ + !restore + mov %o0,%g7 + mov %o1,%g3 /* former %%i1 (val) */ + + sethi %hi(_nwindows_min1), %g4 /* flush registers */ + ld [%g4+%lo(_nwindows_min1)], %g4 +1: save %sp, -SF_REGS_SZ, %sp !NWINDOWS-1 times + sub %g4,1,%g4 + cmp %g0,%g4 + bne 1b + nop +#else + mov %o0,%g7 + mov %o1,%g3 /* former %%i1 (val) */ + RW_STORE(sp) +#endif + + ldd [%g7+THREAD_JB_PSR*4], %g4 /* load psr,wim */ + wr %g4, 0x20, %psr + nop + nop + nop + ldd [%g7 +THREAD_JB_SP*4], %sp /* load sp, pc to jump to */ + wr %g5, 0x0, %wim + + RW_LOAD(sp) /* restore window */ + wr %g4, 0x00, %psr + nop + nop + nop + + jmp %o7 + 8 /* success */ + mov %g3, %o0 /* return %%g3 */ + + + + .text + .global thread_setjmp, _do_thread_setjmp +thread_setjmp: + +#ifdef _FLAT + RW_STORE(sp) /* store window */ +#endif + +! RW_STORE(sp) /* store window for _FLAT and normal, SWITCH_TO_STACK in pthread need this*/ + + mov %psr,%o2 +#ifndef _SOFT_FLOAT + set 0x1000,%o3 + andn %o2,%o3,%o2 !disable fpu +#endif + std %sp,[%o0] !THREAD_JB_SP + st %o2,[%o0+(8*4)] !THREAD_JB_PSR + ba _do_thread_setjmp + nop |