diff options
Diffstat (limited to 'sysdeps/standalone/m68k/m68020/start.S')
| -rw-r--r-- | sysdeps/standalone/m68k/m68020/start.S | 145 |
1 files changed, 72 insertions, 73 deletions
diff --git a/sysdeps/standalone/m68k/m68020/start.S b/sysdeps/standalone/m68k/m68020/start.S index 9d7d779e04..fb6fd3eb1a 100644 --- a/sysdeps/standalone/m68k/m68020/start.S +++ b/sysdeps/standalone/m68k/m68020/start.S @@ -1,23 +1,22 @@ -/* Copyright (C) 1994, 1996 Free Software Foundation, Inc. +/* Copyright (C) 1994, 1996, 1997 Free Software Foundation, Inc. Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil), On-Line Applications Research Corporation. + This file is part of the GNU C Library. -This file is part of the GNU C Library. + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. -The GNU C Library is free software; you can redistribute it and/or -modify it under the terms of the GNU Library General Public License as -published by the Free Software Foundation; either version 2 of the -License, or (at your option) any later version. + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. -The GNU C Library is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -Library General Public License for more details. - -You should have received a copy of the GNU Library General Public -License along with the GNU C Library; see the file COPYING.LIB. If -not, write to the Free Software Foundation, Inc., 675 Mass Ave, -Cambridge, MA 02139, USA. */ + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ /* entry.s * @@ -27,7 +26,7 @@ Cambridge, MA 02139, USA. */ * all initialization. */ - .text + .text .globl start | Default entry point .globl _start | Default entry point .globl M68Kvec | Vector Table @@ -37,90 +36,90 @@ start: _start: M68Kvec: | standard location for vectors _M68Kvec: | standard location for vectors - nop | for linkers with problem - | using location zero as entry - jmp around - .space 4088 | to avoid initial intr stack - | from 135BUG on MVME13? as entry - | and start code at 0x4000 + nop | for linkers with problem + | using location zero as entry + jmp around + .space 4088 | to avoid initial intr stack + | from 135BUG on MVME13? as entry + | and start code at 0x4000 around: - move.w %sr,initial_sr | save initial values - movec %isp,%a0 - movel %a0,initial_isp - movec %usp,%a0 - movel %a0,initial_usp - movec %msp,%a0 - movel %a0,initial_msp - oriw #0x0700,%sr | INTERRUPTS OFF!!! + move.w %sr,initial_sr | save initial values + movec %isp,%a0 + movel %a0,initial_isp + movec %usp,%a0 + movel %a0,initial_usp + movec %msp,%a0 + movel %a0,initial_msp + oriw #0x0700,%sr | INTERRUPTS OFF!!! - | - | zero out uninitialized data area - | + | + | zero out uninitialized data area + | zerobss: - moveal #end,%a0 | find end of .bss - moveal #_bss_start,%a1 | find beginning of .bss - movel #0,%d0 + moveal #end,%a0 | find end of .bss + moveal #_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 #heap_size,__C_heap_size | set ___C_heap_size - movel #heap_memory,__C_heap_start | set ___C_heap_start - moveal #interrupt_stack_end,%a0 | set interrupt stack pointer - movec %a0,%isp - moveal #stack_end,%a0 | set master stack pointer - movec %a0,%msp - moveal #stack_end,%a6 | set base pointer - movw #0x3000,%sr | SUPV MODE,INTERRUPTS ON!!! + cmpal %a0,%a1 + jlt loop | loop until _end reached + + movel #heap_size,__C_heap_size | set ___C_heap_size + movel #heap_memory,__C_heap_start | set ___C_heap_start + moveal #interrupt_stack_end,%a0 | set interrupt stack pointer + movec %a0,%isp + moveal #stack_end,%a0 | set master stack pointer + movec %a0,%msp + moveal #stack_end,%a6 | set base pointer + movw #0x3000,%sr | SUPV MODE,INTERRUPTS ON!!! #ifdef NEED_UNDERSCORES - jsr __Board_Initialize | initialize the board + jsr __Board_Initialize | initialize the board #else - jsr _Board_Initialize | initialize the board + jsr _Board_Initialize | initialize the board #endif - move.l #0,%sp@- | envp = NULL - move.l #0,%sp@- | argv = NULL - move.l #0,%sp@- | argc = NULL + move.l #0,%sp@- | envp = NULL + move.l #0,%sp@- | argv = NULL + move.l #0,%sp@- | argc = NULL #ifdef NEED_UNDERSCORES - jsr ___libc_init | initialize the library and - | call main + jsr ___libc_init | initialize the library and + | call main #else - jsr __libc_init | initialize the library and - | call main + jsr __libc_init | initialize the library and + | call main #endif - add.l #12,%sp + add.l #12,%sp - move.l #0,%sp@- | argc = NULL - jsr __exit | call the Board specific exit - addq.l #4,%sp + move.l #0,%sp@- | argc = NULL + jsr __exit | call the Board specific exit + addq.l #4,%sp - move.l initial_isp,%a0 | if __exit returns then we can - movec %a0,%isp | restore the initial values - move.l initial_usp,%a0 - movec %a0,%usp - move.l initial_msp,%a0 - movec %a0,%msp - move.w initial_sr,%sr - rts + move.l initial_isp,%a0 | if __exit returns then we can + movec %a0,%isp | restore the initial values + move.l initial_usp,%a0 + movec %a0,%usp + move.l initial_msp,%a0 + movec %a0,%msp + move.w initial_sr,%sr + rts - .bss + .bss /* * So initial stack registers and status register can be saved. */ #define DECLARE_SPACE(_name,_space,_align) \ - .globl _name ; \ - .align _align ; \ + .globl _name ; \ + .align _align ; \ _name##: .space _space #define DECLARE_LABEL(_name) \ - .globl _name ; \ + .globl _name ; \ _name##: #define DECLARE_PTR(_name) DECLARE_SPACE(_name,4,2) @@ -147,7 +146,7 @@ DECLARE_U32(errno) * Stack Size and Space */ - .set stack_size, 0x20000 + .set stack_size, 0x20000 DECLARE_SPACE(stack_memory,stack_size,4) DECLARE_LABEL(stack_end) |