diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/mvme2307/boot/start.S')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/mvme2307/boot/start.S | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/c/src/lib/libbsp/powerpc/mvme2307/boot/start.S b/c/src/lib/libbsp/powerpc/mvme2307/boot/start.S deleted file mode 100644 index a40f6075e9..0000000000 --- a/c/src/lib/libbsp/powerpc/mvme2307/boot/start.S +++ /dev/null @@ -1,150 +0,0 @@ -/* - * This is based on the mvme-crt0.S file from libgloss/rs6000. - * crt0.S -- startup file for PowerPC systems. - * - * Copyright (c) 1995 Cygnus Support - * - * The authors hereby grant permission to use, copy, modify, distribute, - * and license this software and its documentation for any purpose, provided - * that existing copyright notices are retained in all copies and that this - * notice is included verbatim in any distributions. No written agreement, - * license, or royalty fee is required for any of the authorized uses. - * Modifications to this software may be copyrighted by their authors - * and need not follow the licensing terms described here, provided that - * the new terms are clearly indicated on the first page of each file where - * they apply. - * - * $Id$ - */ - -#include "ppc-asm.h" - - .file "start.S" - .section ".got2","aw" - .align 2 - -.LCTOC1 = .+32768 - - .extern FUNC_NAME(atexit) - .globl FUNC_NAME(__atexit) - .section ".sdata","aw" - .align 2 -FUNC_NAME(__atexit): /* tell C's eabi-ctor's we have an atexit function */ - .long FUNC_NAME(atexit)@fixup /* and that it is to register __do_global_dtors */ - - .section ".fixup","aw" - .align 2 - .long FUNC_NAME(__atexit) - - .section ".got2","aw" -.Ltable = .-.LCTOC1 - .long .LCTOC1 /* address we think .LCTOC1 is loaded at */ - -.Lbss_start = .-.LCTOC1 - .long __sbss_start /* need to include sbss and bss sections */ - -.Lend = .-.LCTOC1 - .long _end - -.Lstack = .-.LCTOC1 /* stack address if set by user */ - .long __stack - -.Ltext_start = .-.LCTOC1 /* beginning of text segment */ - .long __text_start - - .text - /* PPCBUG ROM bootstrap record */ - .ascii "BOOT" /* "magic number" */ - .long 0x10 /* offset to first instruction */ - .long 0x16 /* length of record, including checksum */ - .ascii "BOOT" /* routine name */ - b _start /* code of routine */ - .short 0x6b79 /* checksum */ - .short 0x0000 /* space filler */ -.Lptr: - .long .LCTOC1-.Laddr - - .globl _start - .type _start,@function -_start: - bl .Laddr /* get current address */ -.Laddr: - mflr r4 /* real address of .Laddr */ - lwz r5,(.Lptr-.Laddr)(r4) /* linker generated address of .LCTOC1 */ - add r5,r5,r4 /* correct to real pointer */ - lwz r4,.Ltable(r5) /* get linker's idea of where .Laddr is */ - subf r4,r4,r5 /* calculate difference between where linked and current */ - - /* copy text and data to RAM */ - lwz r6,.Ltext_start(r5) /* calculate beginning of the text */ - lwz r7,.Lbss_start(r5) /* calculate end of the init data */ - - cmplw 1,r6,r7 - bc 4,4,.Ldone1 - - subf r8,r6,r7 /* number of bytes to copy */ - addi r8,r8,3 /* round up to next word boundary */ - srwi r9,r8,2 /* number of words to copy */ - mtctr r9 - addi r6,r6,-4 /* adjust so we can use stwu */ - add r8,r6,r4 /* get source address in ROM */ -.Lloop1: - lwzu r0,4(r8) /* load word from ROM */ - stwu r0,4(r6) /* store word to RAM */ - bdnz .Lloop1 - -.Ldone1: - - - /* clear bss */ - lwz r6,.Lbss_start(r5) /* calculate beginning of the BSS */ - lwz r7,.Lend(r5) /* calculate end of the BSS */ - - cmplw 1,r6,r7 - bc 4,4,.Ldone - - subf r8,r6,r7 /* number of bytes to zero */ - srwi r9,r8,2 /* number of words to zero */ - mtctr r9 - li r0,0 /* zero to clear memory */ - addi r6,r6,-4 /* adjust so we can use stwu */ -.Lloop: - stwu r0,4(r6) /* zero bss */ - bdnz .Lloop - -.Ldone: - - lwz r0,.Lstack(r5) /* stack address or 0 */ - cmplwi 1,r0,0 /* equal to 0? */ - bc 12,6,.Lnostack /* use default stack if == 0 */ - mr sp,r0 /* use user defined stack */ - -.Lnostack: - /* set up initial stack frame */ - addi sp,sp,-4 /* make sure we don't overwrite debug mem */ - lis r0,0 - stw r0,0(sp) /* clear back chain */ - stwu sp,-56(sp) /* push another stack frame */ - - /* jump to RAM and continue */ - ba .Lcontinue -.Lcontinue: - - /* invalidate instruction cache */ - mfspr r4,1008 /* read hid0 */ - ori r5,r4,0x00000800 /* set icfi bit */ - mtspr 1008,r5 - sync - isync - mtspr 1008,r4 /* restore hid0 */ - sync - isync - - /* Let her rip */ - bl FUNC_NAME(boot_card) - - /* return value from boot_card is argument to exit */ - bl FUNC_NAME(exit) - trap -.Lstart: - .size _start,.Lstart-_start |