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03459486d4
* bspspuriousinit.c, m68000spurious.c, m68kpretaskinghook.c, setvec.c, start.S, mvme/mvme16x_hw.h: URL for license changed.
155 lines
4.0 KiB
ArmAsm
155 lines
4.0 KiB
ArmAsm
/* entry.s
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*
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* This file contains the entry point for the application.
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* The name of this entry point is compiler dependent.
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* It jumps to the BSP which is responsible for performing
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* all initialization.
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#include "asm.h"
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#if (M68K_COLDFIRE_ARCH == 0) /* All ColdFire BSPs must provide their own start vector */
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BEGIN_CODE
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| Default entry points for:
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PUBLIC (start) | GNU
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PUBLIC (M68Kvec) | Vector Table
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SYM (start):
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SYM (M68Kvec): | standard location for vectors
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nop | for linkers with problem
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| location zero
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jmp SYM (start_around)
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/*
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* We can use the following space as our vector table
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* if the CPU has a VBR or we can save vector table in it
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* if the CPU does not.
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*/
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.space 4088 | to avoid initial intr stack
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| from 135BUG on MVME13?
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| and start code at 0x4000
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SYM (vectors):
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.space 1016 | reserve space for rest of vectors
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#if ( M68K_HAS_SEPARATE_STACKS == 1 )
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SYM (lowintstack):
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.space 4092 | reserve for interrupt stack
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SYM (hiintstack):
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.space 4 | end of interrupt stack
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#endif
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PUBLIC (start_around)
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SYM (start_around):
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move.w sr, SYM (initial_sr)
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oriw #0x3700,sr | SUPV MODE,INTERRUPTS OFF!!!
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#if ( M68K_HAS_SEPARATE_STACKS == 1 )
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movec isp,a0
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move.l a0, SYM (initial_isp)
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movec usp,a0
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move.l a0, SYM (initial_usp)
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movec msp,a0
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move.l a0, SYM (initial_msp)
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#else
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move.l a7, SYM (initial_msp)
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#endif
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| zero out uninitialized data area
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zerobss:
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moveal # SYM (_clear_end),a0 | find end of .bss
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moveal # SYM (_clear_start),a1 | find beginning of .bss
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movel #0,d0
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loop: movel #0,a1@+ | to zero out uninitialized
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cmpal a0,a1
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jlt loop | loop until _end reached
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movel # SYM (_stack_init),d0 | d0 = stop of stack
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movw #0x3700,sr | SUPV MODE,INTERRUPTS OFF!!!
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movel d0,a7 | set master stack pointer
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movel d0,a6 | set base pointer
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/*
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* RTEMS should maintain a separate interrupt stack on CPUs
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* without one in hardware. This is currently not supported
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* on versions of the m68k without a HW intr stack.
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*/
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#if ( M68K_HAS_SEPARATE_STACKS == 1 )
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lea SYM (hiintstack),a0 | a0 = high end of intr stack
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movec a0,isp | set interrupt stack
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#endif
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pea env | push environp
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pea arg | push argv
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movel #0,a7@- | push argc
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jsr SYM (boot_card)
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addl #12,a7
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#if ( M68K_HAS_SEPARATE_STACKS == 1 )
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move.l SYM (initial_isp),a0
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movec a0,isp
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move.l SYM (initial_usp),a0
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movec a0,usp
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move.l SYM (initial_msp),a0
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movec a0,msp
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#else
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movea.l SYM (initial_msp),a7
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#endif
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move.w SYM (initial_sr),sr
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rts
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END_CODE
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BEGIN_DATA
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PUBLIC (environ)
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.align 2
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SYM (environ):
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.long env
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PUBLIC (start_frame)
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SYM (start_frame):
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.space 4,0
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END_DATA
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BEGIN_BSS
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env: .long 0
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arg: .long 0
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PUBLIC (initial_isp)
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SYM (initial_isp):
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.space 4
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PUBLIC (initial_msp)
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SYM (initial_msp):
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.space 4
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PUBLIC (initial_usp)
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SYM (initial_usp):
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.space 4
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PUBLIC (initial_sr)
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SYM (initial_sr):
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.space 2
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END_DATA
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#endif
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END
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