diff options
Diffstat (limited to '')
-rw-r--r-- | c/src/lib/libbsp/powerpc/score603e/start/start.S | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/score603e/start/start.S b/c/src/lib/libbsp/powerpc/score603e/start/start.S new file mode 100644 index 0000000000..9f4befee7d --- /dev/null +++ b/c/src/lib/libbsp/powerpc/score603e/start/start.S @@ -0,0 +1,155 @@ +/* + * 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 <rtems/score/targopts.h> +#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 _edata /* includes sbss and bss */ + +.Lend = .-.LCTOC1 + .long _end + +.Lstack = .-.LCTOC1 /* stack address if set by user */ + .long __stack + + .text +.Lptr: + .long .LCTOC1-.Laddr + + .globl _start + .type _start,@function +_start: + b past_constants + /* Set MSR */ + .long _etext /* end of code space */ + .long _edata /* end of code and data space */ + +past_constants: + lis r5,0 + mr r4,r5 + ori r4,r4,0x0000 /* 0x2030 */ + mtmsr r4 + +#if (SCORE603E_GENERATION == 1) + lis r4,0 + mtspr 530,r4 /* Set IBAT1U */ + mtspr 531,r4 /* Set IBAT1L */ + mtspr 534,r4 /* Set IBAT3U */ + mtspr 535,r4 /* Set IBAT3L */ + mtspr 538,r4 /* Set DBAT1U */ + mtspr 539,r4 /* Set DBAT1L */ + lis r4,0 + ori r4,r4,0x1fff + mtspr 528,r4 /* Set IBAT0U */ + mtspr 536,r4 /* Set DBAT0U */ + lis r4,0 + ori r4,r4,0x0002 + mtspr 529,r4 /* Set IBAT0L */ + mtspr 537,r4 /* Set DBAT0L */ + lis r4,-4096 /* 0xf000 */ + ori r4,r4,8191 /* 0x1fff */ + mtspr 532,r4 /* Set IBAT2U */ + mtspr 540,r4 /* Set DBAT2U */ + lis r4,-4096 /* 0xf000 */ + ori r4,r4,1 + mtspr 533,r4 /* Set IBAT2L */ + mtspr 541,r4 /* Set DBAT2L */ + lis r4,-32768 /* 0x8000 */ + ori r4,r4,8191 /* 0x1fff */ + mtspr 542,r4 /* Set DBAT3U */ + lis r4,-32768 /* 0x8000 */ + ori r4,r4,0x003a + mtspr 543,r4 /* Set DBAT3L */ + +#elif (SCORE603E_GENERATION == 2) +/* XXX FILL THIS IN WHEN I GET HELLO TO COME UP. */ + +#else +#error "Unknown Generation of Score603e" +#endif + + 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 */ + + /* clear bss */ + lwz r6,.Lbss_start(r5) /* calculate beginning of the BSS */ + lwz r7,.Lend(r5) /* calculate end of the BSS */ + add r6,r6,r4 /* adjust pointers */ + add r7,r7,r4 + + 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 */ + + /* 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 |