source: rtems/c/src/lib/libbsp/powerpc/shared/start/rtems_crti.S @ a77cd066

4.104.114.84.95
Last change on this file since a77cd066 was 64f8ae4, checked in by Joel Sherrill <joel.sherrill@…>, on Mar 18, 2003 at 7:20:55 PM

2003-03-18 Till Straumann <strauman@…>

PR 356/bsps
This patch makes RTEMS/powerpc/shared EABI compliant.

  • irq/irq_init.c, start/Makefile.am, start/start.S, startup/bspstart.c, startup/pgtbl_setup.c, vectors/vectors.h, vectors/vectors_init.c: zero_bss() should clear not only bss but sbss and sbss2 also (this is probably a bugfix, as sbss/sbss2 are probably used even if -msdata=eabi is not specified).
  • start/rtems_crti.S: New file which must be linked immediately after ecrti.o. rtems_crti.o contains a code snippet who lets init() return immediately. Also, a new entry point '_init' to the C++ Ctors is generated for use by the RTEMS Thread_Handler.
  • Property mode set to 100644
File size: 830 bytes
RevLine 
[64f8ae4]1/* rtems_crti.S */
2#include <asm.h>
3#include <rtems/score/cpu.h>
4#include <libcpu/io.h>
5
6        /* terminate the __init() function and create
7         * a new head '_init' for use by RTEMS to
8         * invoke C++ global constructors
9         * NOTE: it is essential that this snippet
10         * is hooked between ecrti and crtbegin
11         *
12         * ecrti has the following .init section:
13         * __init:
14         *    stwu r1,-16(r1)
15         *    mflr r0
16         *    stw  r0,20(r1)
17         *
18         * The reason for this is that we want to call
19         * __eabi() at an early stage but prevent __eabi()
20         * from branching to __init (C++ exception init
21         * and global CTORs). Hence we make __init a no-op
22         * and create a new entry point:
23         */
24        .section ".init","ax"
25        .align 2
26        lwz             r0,r20(r1)
27        mtlr    r0
28        addi    r1,r1,16
29        blr
30        .globl  _init
31        .type   _init,@function
32_init:
33        stwu    r1,-16(r1)
34        mflr    r0
35        stw             r0,20(r1)       
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