diff options
Diffstat (limited to 'cpukit/score/cpu/m32c/context_switch.S')
| -rw-r--r-- | cpukit/score/cpu/m32c/context_switch.S | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/cpukit/score/cpu/m32c/context_switch.S b/cpukit/score/cpu/m32c/context_switch.S new file mode 100644 index 0000000000..e3bb695555 --- /dev/null +++ b/cpukit/score/cpu/m32c/context_switch.S @@ -0,0 +1,68 @@ +/* + * Context switch for the Reneas M32C + * + * COPYRIGHT (c) 1989-2008. + * On-Line Applications Research Corporation (OAR). + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.rtems.com/license/LICENSE. + * + * $Id$ + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#define ARG_EXECUTING 8 +#define ARG_HEIR 12 + +#define CTXT_SP 0 +#define CTXT_FB 4 + + .file "context_switch.S" + .text + .global __CPU_Context_switch + .type __CPU_Context_switch, @function +__CPU_Context_switch: + enter #0 + pushm a0,a1,r0,r1,r2,r3 + pushc flg + pushc sb + +#if defined(__r8c_cpu__) + #warning "not implemented on R8C" +#else + mov.l ARG_EXECUTING[fb],a0 ; a0 = executing + stc fb,a1 + mov.l a1,CTXT_FB[a0] ; save fb + stc sp,a1 + mov.l a1,CTXT_SP[a0] ; save sp + + mov.l ARG_HEIR[fb],a0 ; a0 = heir + +restore: + mov.l CTXT_SP[a0],a1 + ldc a1,sp ; restore sp + mov.l CTXT_FB[a0],a1 + ldc a1,fb ; restore fb +#endif + popc sb + popc flg + popm a0,a1,r0,r1,r2,r3 + exitd + .size __CPU_Context_switch, .-__CPU_Context_switch + +#define ARG_RESTART 8 + + .global __CPU_Context_Restart_self + .type __CPU_Context_Restart_self, @function +__CPU_Context_Restart_self: + enter #0 +#if defined(__r8c_cpu__) + #warning "__CPU_Context_Restart_self: not implemented on R8C" +#else + mov.l ARG_RESTART[fb],a0 ; a0 = heir + jmp.s restore +#endif |