diff options
Diffstat (limited to 'c/src/lib/start/m68k/start.s')
| -rw-r--r-- | c/src/lib/start/m68k/start.s | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/c/src/lib/start/m68k/start.s b/c/src/lib/start/m68k/start.s deleted file mode 100644 index 0bbb0a851f..0000000000 --- a/c/src/lib/start/m68k/start.s +++ /dev/null @@ -1,160 +0,0 @@ -/* entry.s - * - * This file contains the entry point for the application. - * The name of this entry point is compiler dependent. - * It jumps to the BSP which is responsible for performing - * all initialization. - * - * 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" - -BEGIN_CODE - | Default entry points for: - PUBLIC (start) | GNU - PUBLIC (M68Kvec) | Vector Table - -SYM (start): -SYM (M68Kvec): | standard location for vectors - nop | for linkers with problem - | location zero - jmp SYM (start_around) - - /* - * We can use the following space as our vector table - * if the CPU has a VBR or we can save vector table in it - * if the CPU does not. - */ - - .space 4088 | to avoid initial intr stack - | from 135BUG on MVME13? - | and start code at 0x4000 -SYM (vectors): - .space 1016 | reserve space for rest of vectors - -#if ( M68K_HAS_SEPARATE_STACKS == 1 ) -SYM (lowintstack): - .space 4092 | reserve for interrupt stack -SYM (hiintstack): - .space 4 | end of interrupt stack -#endif - - PUBLIC (start_around) -SYM (start_around): - move.w sr, SYM (initial_sr) -#if ( M68K_HAS_SEPARATE_STACKS == 1 ) - movec isp,a0 - move.l a0, SYM (initial_isp) - movec usp,a0 - move.l a0, SYM (initial_usp) - movec msp,a0 - move.l a0, SYM (initial_msp) -#else - move.l a7, SYM (initial_msp) -#endif - oriw #0x0700,sr | INTERRUPTS OFF!!! - - - - | - | zero out uninitialized data area - | -zerobss: - moveal # SYM (end),a0 | find end of .bss - moveal # SYM (bss_start),a1 | find beginning of .bss - movel #0,d0 - -loop: movel #0,a1@+ | to zero out uninitialized - cmpal a0,a1 - jlt loop | loop until _end reached - - movel # SYM (end),d0 | d0 = end of bss/start of heap - addl # SYM (heap_size),d0 | d0 = end of heap - movel d0, SYM (stack_start) | Save for brk() routine - addl # SYM (stack_size),d0 | make room for stack - andl #0xffffffc0,d0 | align it on 16 byte boundary - movw #0x3700,sr | SUPV MODE,INTERRUPTS OFF!!! - movel d0,a7 | set master stack pointer - movel d0,a6 | set base pointer - - /* - * RTEMS should maintiain a separate interrupt stack on CPUs - * without one in hardware. This is currently not supported - * on versions of the m68k without a HW intr stack. - */ - -#if ( M68K_HAS_SEPARATE_STACKS == 1 ) - lea SYM (hiintstack),a0 | a0 = high end of intr stack - movec a0,isp | set interrupt stack -#endif - - jsr SYM (bsp_start) -#if ( M68K_HAS_SEPARATE_STACKS == 1 ) - move.l SYM (initial_isp),a0 - movec a0,isp - move.l SYM (initial_usp),a0 - movec a0,usp - move.l SYM (initial_msp),a0 - movec a0,msp -#else - movea.l SYM (initial_msp),a7 -#endif - move.w SYM (initial_sr),sr - rts - -END_CODE - -BEGIN_DATA - - PUBLIC (start_frame) -SYM (start_frame): - .space 4,0 - - PUBLIC (stack_start) -SYM (stack_start): - .space 4,0 -END_DATA - -BEGIN_BSS - - PUBLIC (environ) - .align 2 -SYM (environ): - .long 0 - - PUBLIC (initial_isp) -SYM (initial_isp): - .space 4 - - PUBLIC (initial_msp) -SYM (initial_msp): - .space 4 - - PUBLIC (initial_usp) -SYM (initial_usp): - .space 4 - - PUBLIC (initial_sr) -SYM (initial_sr): - .space 2 - - PUBLIC (heap_size) - .set SYM (heap_size),0x2000 - - PUBLIC (stack_size) - .set SYM (stack_size),0x1000 - - -END_DATA -END - - |