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author | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-04-20 10:19:28 +0200 |
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committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-04-20 13:08:36 +0200 |
commit | fbcd7c8fa65eb695e96a62ea1c1ac7a024fa9dfc (patch) | |
tree | a17e285cf22cd49cd42e8b3ad562febc3987d566 /bsps/powerpc/psim | |
parent | bsps: Move console drivers to bsps (diff) | |
download | rtems-fbcd7c8fa65eb695e96a62ea1c1ac7a024fa9dfc.tar.bz2 |
bsps: Move start files to bsps
This patch is a part of the BSP source reorganization.
Update #3285.
Diffstat (limited to 'bsps/powerpc/psim')
-rw-r--r-- | bsps/powerpc/psim/start/start.S | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/bsps/powerpc/psim/start/start.S b/bsps/powerpc/psim/start/start.S new file mode 100644 index 0000000000..918321af5f --- /dev/null +++ b/bsps/powerpc/psim/start/start.S @@ -0,0 +1,141 @@ +/* + * 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. + */ + +#include <rtems/asm.h> +#include <rtems/score/cpu.h> +#include <libcpu/io.h> +#include "ppc-asm.h" + + .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 bsp_section_sbss_begin + +.Lend = .-.LCTOC1 + .long bsp_section_bss_end + +.Lstack = .-.LCTOC1 /* stack address if set by user */ + .long __stack + + .text +.Lptr: + .long .LCTOC1-.Laddr + + .globl __rtems_entry_point + .type __rtems_entry_point,@function +__rtems_entry_point: +#if 1 + .globl _start + .type _start,@function +_start: +#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: +#ifdef __ALTIVEC__ + /* enable altivec; this requires the ALTIVEC user + * extension to be installed in the user extension + * slot 0! + */ + mfmsr r0 + oris r0, r0, (1<<(31-16-6)) + mtmsr r0 + isync + /* + * set vscr and vrsave to known values + */ + li r0, 0 + mtvrsave r0 + vxor 0,0,0 + mtvscr 0 +#endif + /* set up initial stack frame */ + addi sp,sp,-4 /* make sure we don't overwrite debug mem */ + /* align */ + li r3, CPU_STACK_ALIGNMENT-1 + andc sp, sp, r3 + lis r0,0 + stw r0,0(sp) /* clear back chain */ + stwu sp,-CPU_STACK_ALIGNMENT(sp) /* push another stack frame */ + bl FUNC_NAME(__eabi) + + /* Let her rip */ + li r3, 0 /* command line */ + bl FUNC_NAME(boot_card) + + .globl FUNC_NAME(bsp_reset) +FUNC_NAME(bsp_reset): + li 10,99 /* 0x63 */ + sc + +.Lstart: + .size _start,.Lstart-_start + + /* Start stack area */ +.section ".bsp_rwextra", "aw", @nobits +.align 4 +.space 4096 +__stack: |