From 2b3e9d9b244e279ef5693a7cf5dacc7903164af5 Mon Sep 17 00:00:00 2001 From: Ralf Corsepius Date: Mon, 22 Jul 2002 09:46:48 +0000 Subject: Remove, moved to cpukit. --- c/src/exec/score/cpu/m68k/cpu_asm.S | 263 ------------------------------------ 1 file changed, 263 deletions(-) delete mode 100644 c/src/exec/score/cpu/m68k/cpu_asm.S (limited to 'c/src/exec/score/cpu/m68k/cpu_asm.S') diff --git a/c/src/exec/score/cpu/m68k/cpu_asm.S b/c/src/exec/score/cpu/m68k/cpu_asm.S deleted file mode 100644 index 0d14c16401..0000000000 --- a/c/src/exec/score/cpu/m68k/cpu_asm.S +++ /dev/null @@ -1,263 +0,0 @@ -/* cpu_asm.s - * - * This file contains all assembly code for the MC68020 implementation - * of RTEMS. - * - * COPYRIGHT (c) 1989-2001. - * 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.OARcorp.com/rtems/license.html. - * - * $Id$ - */ - - -#include - - .text - -/* void _CPU_Context_switch( run_context, heir_context ) - * - * This routine performs a normal non-FP context. - */ - - .align 4 - .global SYM (_CPU_Context_switch) - -.set RUNCONTEXT_ARG, 4 | save context argument -.set HEIRCONTEXT_ARG, 8 | restore context argument - -SYM (_CPU_Context_switch): - moval a7@(RUNCONTEXT_ARG),a0| a0 = running thread context - movw sr,d1 | d1 = status register - movml d1-d7/a2-a7,a0@ | save context - - moval a7@(HEIRCONTEXT_ARG),a0| a0 = heir thread context -restore: movml a0@,d1-d7/a2-a7 | restore context - movw d1,sr | restore status register - rts - -/*PAGE - * void __CPU_Context_save_fp_context( &fp_context_ptr ) - * void __CPU_Context_restore_fp_context( &fp_context_ptr ) - * - * These routines are used to context switch a MC68881 or MC68882. - * - * NOTE: Context save and restore code is based upon the code shown - * on page 6-38 of the MC68881/68882 Users Manual (rev 1). - * - * CPU_FP_CONTEXT_SIZE is higher than expected to account for the - * -1 pushed at end of this sequence. - * - * Neither of these entries is required if we have software FPU - * emulation. But if we don't have an FPU or emulation, then - * we need the stub versions of these routines. - */ - -#if (CPU_SOFTWARE_FP == FALSE) - -.set FPCONTEXT_ARG, 4 | save FP context argument - - .align 4 - .global SYM (_CPU_Context_save_fp) -SYM (_CPU_Context_save_fp): -#if ( M68K_HAS_FPU == 1 ) - moval a7@(FPCONTEXT_ARG),a1 | a1 = &ptr to context area - moval a1@,a0 | a0 = Save context area - fsave a0@- | save 68881/68882 state frame - tstb a0@ | check for a null frame - beq.b nosv | Yes, skip save of user model - fmovem fp0-fp7,a0@- | save data registers (fp0-fp7) - fmovem fpc/fps/fpi,a0@- | and save control registers - movl #-1,a0@- | place not-null flag on stack -nosv: movl a0,a1@ | save pointer to saved context -#endif - rts - - .align 4 - .global SYM (_CPU_Context_restore_fp) -SYM (_CPU_Context_restore_fp): -#if ( M68K_HAS_FPU == 1 ) - moval a7@(FPCONTEXT_ARG),a1 | a1 = &ptr to context area - moval a1@,a0 | a0 = address of saved context - tstb a0@ | Null context frame? - beq.b norst | Yes, skip fp restore - addql #4,a0 | throwaway non-null flag - fmovem a0@+,fpc/fps/fpi | restore control registers - fmovem a0@+,fp0-fp7 | restore data regs (fp0-fp7) -norst: frestore a0@+ | restore the fp state frame - movl a0,a1@ | save pointer to saved context -#endif - rts -#endif - -/*PAGE - * void _ISR_Handler() - * - * This routine provides the RTEMS interrupt management. - * - * NOTE: - * Upon entry, the master stack will contain an interrupt stack frame - * back to the interrupted thread and the interrupt stack will contain - * a throwaway interrupt stack frame. If dispatching is enabled, and this - * is the outer most interrupt, and a context switch is necessary or - * the current thread has pending signals, then set up the master stack to - * transfer control to the interrupt dispatcher. - */ - -#if ( M68K_COLDFIRE_ARCH == 1 ) -.set SR_OFFSET, 2 | Status register offset -.set PC_OFFSET, 4 | Program Counter offset -.set FVO_OFFSET, 0 | Format/vector offset -#elif ( M68K_HAS_VBR == 1) -.set SR_OFFSET, 0 | Status register offset -.set PC_OFFSET, 2 | Program Counter offset -.set FVO_OFFSET, 6 | Format/vector offset -#else -.set SR_OFFSET, 2 | Status register offset -.set PC_OFFSET, 4 | Program Counter offset -.set FVO_OFFSET, 0 | Format/vector offset placed in the stack -#endif /* M68K_HAS_VBR */ - -.set SAVED, 16 | space for saved registers - - .align 4 - .global SYM (_ISR_Handler) - -SYM (_ISR_Handler): - addql #1,SYM (_Thread_Dispatch_disable_level) | disable multitasking -#if ( M68K_COLDFIRE_ARCH == 0 ) - moveml d0-d1/a0-a1,a7@- | save d0-d1,a0-a1 -#else - lea a7@(-SAVED),a7 - movm.l d0-d1/a0-a1,a7@ | save d0-d1,a0-a1 -#endif - movew a7@(SAVED+FVO_OFFSET),d0 | d0 = F/VO - andl #0x0ffc,d0 | d0 = vector offset in vbr - - -#if ( CPU_HAS_SOFTWARE_INTERRUPT_STACK == 1 ) - movel _CPU_Interrupt_stack_high,a0 | a0 now point just above interrupt stack - cmpl _CPU_Interrupt_stack_low,a7 | stack below interrupt stack? - bcs.b 1f | yes, switch to interrupt stack - cmpl a0,a7 | stack above interrupt stack? - bcs.b 2f | no, do not switch stacks -1: - movel a7,a1 | copy task stack pointer - movel a0,a7 | switch to interrupt stack - movel a1,a7@- | store task stack pointer on interrupt stack -2: -#endif /* CPU_HAS_SOFTWARE_INTERRUPT_STACK == 1 */ - - movel SYM (_ISR_Vector_table),a0 | a0= base of RTEMS table -#if ( M68K_HAS_PREINDEXING == 1 ) - movel (a0,d0:w:1),a0 | a0 = address of user routine -#else - addal d0,a0 | a0 = address of vector - movel (a0),a0 | a0 = address of user routine -#endif - - lsrl #2,d0 | d0 = vector number - movel d0,a7@- | push vector number - jbsr a0@ | invoke the user ISR - addql #4,a7 | remove vector number - -#if ( CPU_HAS_SOFTWARE_INTERRUPT_STACK == 1 ) - movel _CPU_Interrupt_stack_high,a0 - subql #4,a0 - cmpl a0,a7 | At top of interrupt stack? - bne.b 1f | No, do not restore task stack pointer - movel (a7),a7 | Restore task stack pointer -1: -#endif /* CPU_HAS_SOFTWARE_INTERRUPT_STACK == 1 */ - - subql #1,SYM (_Thread_Dispatch_disable_level) - | unnest multitasking - bne.b exit | If dispatch disabled, exit - -#if ( M68K_HAS_SEPARATE_STACKS == 1 ) - movew #0xf000,d0 | isolate format nibble - andw a7@(SAVED+FVO_OFFSET),d0 | get F/VO - cmpiw #0x1000,d0 | is it a throwaway isf? - bne.b exit | NOT outer level, so branch -#else -/* - * If we have a CPU which allows a higher-priority interrupt to preempt a - * lower priority handler before the lower-priority handler can increment - * _Thread_Dispatch_disable_level then we must check the PC on the stack to - * see if it is _ISR_Handler. If it is we have the case of nesting interrupts - * without the dispatch level being incremented. - */ - #if ( M68K_COLDFIRE_ARCH == 0 && M68K_MC68060_ARCH == 0 ) - cmpl #_ISR_Handler,a7@(SAVED+PC_OFFSET) - beq.b exit - #endif -#endif - tstl SYM (_Context_Switch_necessary) - | Is thread switch necessary? - bne.b bframe | Yes, invoke dispatcher - - tstl SYM (_ISR_Signals_to_thread_executing) - | signals sent to Run_thread - | while in interrupt handler? - beq.b exit | No, then exit - -bframe: clrl SYM (_ISR_Signals_to_thread_executing) - | If sent, will be processed -#if ( M68K_HAS_SEPARATE_STACKS == 1 ) - movec msp,a0 | a0 = master stack pointer - movew #0,a0@- | push format word - movel #SYM(_ISR_Dispatch),a0@- | push return addr - movew a0@(6),a0@- | push saved sr - movec a0,msp | set master stack pointer -#else - jsr SYM (_Thread_Dispatch) | Perform context switch -#endif - -#if ( M68K_COLDFIRE_ARCH == 0 ) -exit: moveml a7@+,d0-d1/a0-a1 | restore d0-d1,a0-a1 -#else -exit: moveml a7@,d0-d1/a0-a1 | restore d0-d1,a0-a1 - lea a7@(SAVED),a7 -#endif - -#if ( M68K_HAS_VBR == 0 ) - addql #2,a7 | pop format/id -#endif /* M68K_HAS_VBR */ - rte | return to thread - | OR _Isr_dispatch - -/*PAGE - * void _ISR_Dispatch() - * - * Entry point from the outermost interrupt service routine exit. - * The current stack is the supervisor mode stack if this processor - * has separate stacks. - * - * 1. save all registers not preserved across C calls. - * 2. invoke the _Thread_Dispatch routine to switch tasks - * or a signal to the currently executing task. - * 3. restore all registers not preserved across C calls. - * 4. return from interrupt - */ - - .global SYM (_ISR_Dispatch) -SYM (_ISR_Dispatch): -#if ( M68K_COLDFIRE_ARCH == 0 ) - movml d0-d1/a0-a1,a7@- - jsr SYM (_Thread_Dispatch) - movml a7@+,d0-d1/a0-a1 -#else - lea a7@(-SAVED),a7 - movml d0-d1/a0-a1,a7@ - jsr SYM (_Thread_Dispatch) - movml a7@,d0-d1/a0-a1 - lea a7@(SAVED),a7 -#endif - -#if ( M68K_HAS_VBR == 0 ) - addql #2,a7 | pop format/id -#endif /* M68K_HAS_VBR */ - rte -- cgit v1.2.3