diff options
Diffstat (limited to 'c/src/exec/score/cpu/m68k/cpu_asm.s')
| -rw-r--r-- | c/src/exec/score/cpu/m68k/cpu_asm.s | 202 |
1 files changed, 0 insertions, 202 deletions
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 d8615627a0..0000000000 --- a/c/src/exec/score/cpu/m68k/cpu_asm.s +++ /dev/null @@ -1,202 +0,0 @@ -/* cpu_asm.s - * - * This file contains all assembly code for the MC68020 implementation - * of RTEMS. - * - * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. - * On-Line Applications Research Corporation (OAR). - * All rights assigned to U.S. Government, 1994. - * - * This material may be reproduced by or for the U.S. Government pursuant - * to the copyright license under the clause at DFARS 252.227-7013. This - * notice must appear in all copies of this file and its derivatives. - * - * $Id$ - */ - - -#include <asm.h> - - .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. - */ - -.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 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 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 - -/*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, this - * is the outer most interrupt, and (a context switch is necessary or - * the current thread has signals), then set up the master stack to - * transfer control to the interrupt dispatcher. - */ - -.set SR_OFFSET, 0 | Status register offset -.set PC_OFFSET, 2 | Program Counter offset -.set FVO_OFFSET, 6 | Format/vector offset - -.set SAVED, 16 | space for saved registers - - .align 4 - .global SYM (_ISR_Handler) - -SYM (_ISR_Handler): - moveml d0-d1/a0-a1,a7@- | save d0-d1,a0-a1 - addql #1,SYM (_ISR_Nest_level) | one nest level deeper - addql #1,SYM (_Thread_Dispatch_disable_level) - | disable multitasking - movew a7@(SAVED+FVO_OFFSET),d0 | d0 = F/VO - andl #0x0fff,d0 | d0 = vector offset in vbr - -#if ( M68K_HAS_PREINDEXING == 1 ) - movel @( SYM (_ISR_Vector_table),d0:w:1),a0| fetch the ISR -#else - movel # SYM (_ISR_Vector_table),a0 | a0 = base of RTEMS table - addal d0,a0 | a0 = address of vector - movel @(a0),a0 | a0 = address of user routine -#warning "UNTESTED CODE!!!" -#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 - - subql #1,SYM (_ISR_Nest_level) | one less nest level - subql #1,SYM (_Thread_Dispatch_disable_level) - | unnest multitasking - bne exit | If dispatch disabled, exit - - movew #0xf000,d0 | isolate format nibble - andw a7@(SAVED+FVO_OFFSET),d0 | get F/VO - cmpiw #0x1000,d0 | is it a throwaway isf? - bne exit | NOT outer level, so branch - - tstl SYM (_Context_Switch_necessary) - | Is thread switch necessary? - bne bframe | Yes, invoke dispatcher - - tstl SYM (_ISR_Signals_to_thread_executing) - | signals sent to Run_thread - | while in interrupt handler? - beq 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+SR_OFFSET),a0@- | push thread sr - movec a0,msp | set master stack pointer -#else -#warning "FIX ME ... HOW DO I DISPATCH FROM AN INTERRUPT?" -/* probably will simply need to push the _ISR_Dispatch frame */ -#endif - -exit: moveml a7@+,d0-d1/a0-a1 | restore d0-d1,a0-a1 - 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): - movml d0-d1/a0-a1,a7@- - jsr SYM (_Thread_Dispatch) - movml a7@+,d0-d1/a0-a1 - rte - - - - - - - - - - - |