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-rw-r--r--cpukit/score/cpu/avr/cpu_asm.S458
1 files changed, 0 insertions, 458 deletions
diff --git a/cpukit/score/cpu/avr/cpu_asm.S b/cpukit/score/cpu/avr/cpu_asm.S
deleted file mode 100644
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--- a/cpukit/score/cpu/avr/cpu_asm.S
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-/* cpu_asm.c ===> cpu_asm.S or cpu_asm.s
- *
- * This file contains the basic algorithms for all assembly code used
- * in an specific CPU port of RTEMS. These algorithms must be implemented
- * in assembly language
- *
- * NOTE: This is supposed to be a .S or .s file NOT a C file.
- *
- * 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.org/license/LICENSE.
- */
-
-/*
- * This is supposed to be an assembly file. This means that system.h
- * and cpu.h should not be included in a "real" cpu_asm file. An
- * implementation in assembly should include "cpu_asm.h>
- */
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <rtems/asm.h>
-#include <avr/sfr_defs.h>
-#include <rtems/score/percpu.h>
-
-
-#define jmpb_hi r25
-#define jmpb_lo r24
-#define val_hi r23
-#define val_lo r22
-
-#define ret_lo r24
-#define ret_hi r25
-
- PUBLIC( setjmp )
-
-SYM( setjmp ):
- X_movw XL, jmpb_lo
-/*;save call-saved registers and frame pointer*/
- .irp .L_regno, 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,28,29
- st X+, r\.L_regno
- .endr
-/*;get return address*/
-
- pop ZH
- pop ZL
-/*save stack pointer (after popping)*/
-
- in ret_lo, AVR_STACK_POINTER_LO_ADDR
- st X+, ret_lo
-
-#ifdef _HAVE_AVR_STACK_POINTER_HI
- in ret_lo, AVR_STACK_POINTER_HI_ADDR
- st X+, ret_lo
-#else
- st X+, ret_lo
-#endif
-/*save status reg (I flag)*/
- in ret_lo, AVR_STATUS_ADDR
- st X+, ret_lo
-/*save return addr*/
- st X+, ZL
- st X+, ZH
-/*return zero*/
- clr ret_hi
- clr ret_lo
- ijmp
-
- .size _U(setjmp),.-_U(setjmp)
-
-
- .global _U(longjmp)
- .type _U(longjmp), @function
-
-_U(longjmp):
- X_movw XL, jmpb_lo
-/*return value*/
- X_movw ret_lo, val_lo
-/*if zero, change to 1*/
- cpi ret_lo, 1
- cpc ret_hi, __zero_reg__
- adc ret_lo, __zero_reg__
-/*restore call-saved registers and frame pointer*/
- .irp .L_regno, 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,28,29
- ld r\.L_regno, X+
- .endr
-/*; restore stack pointer (SP value before the setjmp() call) and SREG*/
- ld ZL, X+
- ld ZH, X+
- ld __tmp_reg__, X+
-#if defined (__AVR_XMEGA__) && __AVR_XMEGA__
- /* A write to SPL will automatically disable interrupts for up to 4
- instructions or until the next I/O memory write. */
- out AVR_STATUS_ADDR, __tmp_reg__
- out AVR_STACK_POINTER_LO_ADDR, ZL
- out AVR_STACK_POINTER_HI_ADDR, ZH
-#else
-# ifdef _HAVE_AVR_STACK_POINTER_HI
- /* interrupts disabled for shortest possible time (3 cycles) */
- cli
- out AVR_STACK_POINTER_HI_ADDR, ZH
-# endif
- /* Restore status register (including the interrupt enable flag).
- Interrupts are re-enabled only after the next instruction. */
- out AVR_STATUS_ADDR, __tmp_reg__
- out AVR_STACK_POINTER_LO_ADDR, ZL
-#endif
- ; get return address and jump
- ld ZL, X+
- ld ZH, X+
-#if defined(__AVR_3_BYTE_PC__) && __AVR_3_BYTE_PC__
- ld __tmp_reg__, X+
-.L_jmp3:
- push ZL
- push ZH
- push __tmp_reg__
- ret
-#else
- ijmp
-#endif
- .size _U(longjmp), . - _U(longjmp)
-
-
-
-/*
- * _CPU_Context_save_fp_context
- *
- * This routine is responsible for saving the FP context
- * at *fp_context_ptr. If the point to load the FP context
- * from is changed then the pointer is modified by this routine.
- *
- * Sometimes a macro implementation of this is in cpu.h which dereferences
- * the ** and a similarly named routine in this file is passed something
- * like a (Context_Control_fp *). The general rule on making this decision
- * is to avoid writing assembly language.
- *
- * NO_CPU Specific Information:
- *
- * XXX document implementation including references if appropriate
-
-
-void _CPU_Context_save_fp(
- Context_Control_fp **fp_context_ptr
-)
-{
-}
-*/
-
- PUBLIC(_CPU_Context_save_fp)
-
-SYM(_CPU_Context_save_fp):
- ret
-
-
-
-
-
-
-
-/*
- * _CPU_Context_restore_fp_context
- *
- * This routine is responsible for restoring the FP context
- * at *fp_context_ptr. If the point to load the FP context
- * from is changed then the pointer is modified by this routine.
- *
- * Sometimes a macro implementation of this is in cpu.h which dereferences
- * the ** and a similarly named routine in this file is passed something
- * like a (Context_Control_fp *). The general rule on making this decision
- * is to avoid writing assembly language.
- *
- * NO_CPU Specific Information:
- *
- * XXX document implementation including references if appropriate
-
-
-void _CPU_Context_restore_fp(
- Context_Control_fp **fp_context_ptr
-)
-{
-}
-*/
-
-
- PUBLIC(_CPU_Context_restore_fp)
-
-SYM(_CPU_Context_restore_fp):
- ret
-
-
-
-/* _CPU_Context_switch
- *
- * This routine performs a normal non-FP context switch.
- *
- * NO_CPU Specific Information:
- *
- * XXX document implementation including references if appropriate
- void _CPU_Context_switch(
- Context_Control *run,
- Context_Control *heir
-);
-
-*/
-
- PUBLIC(_CPU_Context_switch)
-SYM(_CPU_Context_switch):
- mov r26, r24 /*r26,r27 is X*/
- mov r27, r25
- mov r24, r22
- mov r25, r23
- /*save registers*/
-#if 1
-/*if this section is removed there is a problem.*/
-/*debug section start*/
- pop r22
- pop r23
- push r22
- push r23
-/*debug section end*/
-#endif
-
- push r2
- push r3
- push r4
- push r5
- push r6
- push r7
- push r8
- push r9
- push r10
- push r11
- push r12
- push r13
- push r14
- push r15
- push r16
- push r17
-
- push r28
- push r29
-
- /*load sreg*/
- lds r23,0x5f /*load sreg*/
- /*disable interrupts*/
- cli
- /*load stack pointer*/
- lds r22,0x5d /*spl*/
- lds r21,0x5e /*sph*/
- /*save sreg and sp to context struct*/
-
- /*save low then high byte --- verify this delete when verified*/
- st X+, r22
- st X+, r21
- st X, r23
-
- PUBLIC(_CPU_Context_restore)
-
-SYM(_CPU_Context_restore):
- mov r26,r24 /* R26/27 are X */
- mov r27,r25
-
- /*restore stack pointer*/
- ld r25, X+
- ld r24, X+
- sts 0x5E,r24 /*sph*/
- sts 0x5D ,r25 /*spl*/
- /*restore registers from stack*/
-
-
- pop r29
- pop r28
-
-
- pop r17
- pop r16
- pop r15
- pop r14
- pop r13
- pop r12
- pop r11
- pop r10
- pop r9
- pop r8
- pop r7
- pop r6
- pop r5
- pop r4
- pop r3
- pop r2
-
- /*restore sreg*/
- ld r25, X
- sts 0x5f,r25 /*sreg*/
- pop r30
- pop r31
- IJMP
- ret
-
-
-
-/*
- * _CPU_Context_Initialize
- *
- * This kernel routine initializes the basic non-FP context area associated
- * with each thread.
- *
- * Input parameters:
- * the_context - pointer to the context area
- * stack_base - address of memory for the SPARC
- * size - size in bytes of the stack area
- * new_level - interrupt level for this context area
- * entry_point - the starting execution point for this this context
- * is_fp - TRUE if this context is associated with an FP thread
- *
- * the_context is in r25,r24
- * entry point is in r13,r12
- * stack base is in r23, r22
- * size is in r21, r20, r19,r18
- * newleve is in r14,r15, r16, 17
- *
- *
- * Output parameters: NONE
- */
-
- PUBLIC(_CPU_Context_Initialize)
-SYM(_CPU_Context_Initialize):
- //save caller saved regs
- PUSH R10
- PUSH R11
- PUSH R12
- PUSH R13
- PUSH R14
- PUSH R15
- PUSH R16
- PUSH R17
- PUSH R28
- PUSH R29
- //calculate new stack pointer
- ADD R22, R18
- ADC R23, R19
- MOV R26, R22
- MOV R27, R23
- //Initialize stack with entry point
- ST -X, R13
- ST -X, R12
- //store new stack pointer in context control
- SBIW R26, 0X13 /*subtract 33 to account for registers*/
- MOV R28, R24
- MOV R29, R25
- STD Y+1, R27 //save stack pointer high to context control
- ST Y, R26 //save stack pointer low to context control
- //set interrupt level in new context
- LDI R18, 0 //set sreg in new context to zero
- STD Y+2, R18 //interrupts not enabled
- MOV R18, R14
- CPI R18, 0
- BRNE NEW_LEVEL_ZERO
- LDI R18, 0X80 //set sreg in new context to 0x80
- STD Y+2, R18 //interupts enabled
-NEW_LEVEL_ZERO:
- //restore caller saved regs
- POP R29
- POP R28
- POP R17
- POP R16
- POP R15
- POP R14
- POP R13
- POP R12
- POP R11
- POP R10
- RET
-
-
-
-/* void __ISR_Handler()
- *
- * This routine provides the RTEMS interrupt management.
- *
- * NO_CPU Specific Information:
- *
- * XXX document implementation including references if appropriate
-
-
-void _ISR_Handler(void)
-{
-
-*/
- /*
- * This discussion ignores a lot of the ugly details in a real
- * implementation such as saving enough registers/state to be
- * able to do something real. Keep in mind that the goal is
- * to invoke a user's ISR handler which is written in C and
- * uses a certain set of registers.
- *
- * Also note that the exact order is to a large extent flexible.
- * Hardware will dictate a sequence for a certain subset of
- * _ISR_Handler while requirements for setting
- */
-
- /*
- * At entry to "common" _ISR_Handler, the vector number must be
- * available. On some CPUs the hardware puts either the vector
- * number or the offset into the vector table for this ISR in a
- * known place. If the hardware does not give us this information,
- * then the assembly portion of RTEMS for this port will contain
- * a set of distinct interrupt entry points which somehow place
- * the vector number in a known place (which is safe if another
- * interrupt nests this one) and branches to _ISR_Handler.
- *
- * save some or all context on stack
- * may need to save some special interrupt information for exit
- *
- * #if ( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE )
- * if ( _ISR_Nest_level == 0 )
- * switch to software interrupt stack
- * #endif
- *
- * _ISR_Nest_level++;
- *
- * _Thread_Dispatch_disable_level++;
- *
- * (*_ISR_Vector_table[ vector ])( vector );
- *
- * _Thread_Dispatch_disable_level--;
- *
- * --_ISR_Nest_level;
- *
- * if ( _ISR_Nest_level )
- * goto the label "exit interrupt (simple case)"
- *
- * if ( _Thread_Dispatch_disable_level )
- * goto the label "exit interrupt (simple case)"
- *
- * if ( _Thread_Dispatch_necessary ) {
- * call _Thread_Dispatch() or prepare to return to _ISR_Dispatch
- * prepare to get out of interrupt
- * return from interrupt (maybe to _ISR_Dispatch)
- *
- * LABEL "exit interrupt (simple case):
- * #if ( CPU_HAS_SOFTWARE_INTERRUPT_STACK == TRUE )
- * if outermost interrupt
- * restore stack
- * #endif
- * prepare to get out of interrupt
- * return from interrupt
- */
-/*} */
- PUBLIC(_ISR_Handler)
-
-SYM(_ISR_Handler):
- ret
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