diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/helas403/dlentry/dlentry.S')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/helas403/dlentry/dlentry.S | 146 |
1 files changed, 0 insertions, 146 deletions
diff --git a/c/src/lib/libbsp/powerpc/helas403/dlentry/dlentry.S b/c/src/lib/libbsp/powerpc/helas403/dlentry/dlentry.S deleted file mode 100644 index f218d9c5d6..0000000000 --- a/c/src/lib/libbsp/powerpc/helas403/dlentry/dlentry.S +++ /dev/null @@ -1,146 +0,0 @@ -/* dlentry.s - * - * This file contains the entry code for RTEMS programs starting - * after download to RAM - * - * Author: Thomas Doerfler <td@imd.m.isar.de> - * IMD Ingenieurbuero fuer Microcomputertechnik - * - * COPYRIGHT (c) 1998 by IMD - * - * Changes from IMD are covered by the original distributions terms. - * This file has been derived from the papyrus BSP: - * - * This file contains the entry veneer for RTEMS programs - * downloaded to Papyrus. - * - * Author: Andrew Bray <andy@i-cubed.co.uk> - * - * COPYRIGHT (c) 1995 by i-cubed ltd. - * - * To anyone who acknowledges that this file is provided "AS IS" - * without any express or implied warranty: - * permission to use, copy, modify, and distribute this file - * for any purpose is hereby granted without fee, provided that - * the above copyright notice and this notice appears in all - * copies, and that the name of i-cubed limited not be used in - * advertising or publicity pertaining to distribution of the - * software without specific, written prior permission. - * i-cubed limited makes no representations about the suitability - * of this software for any purpose. - * - * $Id$ - */ - -#include <rtems/asm.h> - -/* - * The helas403 ELF link scripts support three special sections: - * .entry The actual entry point - * .vectors The section containing the interrupt entry veneers. - */ - -/* - * Downloaded code loads the vectors separately to 0x00000100, - * so .entry can be over 256 bytes. - * - * The other sections are linked in the following order: - * .entry - * .text - * .data - * .bss - * see linker command file for section placement - * - * The initial stack is set to stack.end - * - * All the entry veneer has to do is to clear the BSS. - */ - -/* - * GDB likes to have debugging information for the entry veneer. - * Here was some DWARF information. IMD removed it, because we - * could not check, whether it was still correct. Sorry. - - */ - -#if PPC_ASM == PPC_ASM_ELF - .section .entry -#else - .csect .text[PR] -#endif - - PUBLIC_VAR (download_entry) -SYM(download_entry): - bl .startup -base_addr: - -/*--------------------------------------------------------------------------- - * Parameters from linker - *--------------------------------------------------------------------------*/ -toc_pointer: -#if PPC_ASM == PPC_ASM_ELF - .long s.got -#else - .long TOC[tc0] -#endif -bss_length: - .long bss.size -bss_addr: - .long bss.start -stack_top: - .long stack.end -/*--------------------------------------------------------------------------- - * Reset_entry. - *--------------------------------------------------------------------------*/ -.startup: - /* Get start address, stack grows down from here... */ - mflr r1 - - /* Assume Bank regs set up..., cache etc. */ - bl bssclr - - .extern SYM(__vectors) - - lis r2,__vectors@h /* set EVPR exc. vector prefix */ - mtspr evpr,r2 - - /*------------------------------------------------------------------- - * C_setup. - *------------------------------------------------------------------*/ - lwz r2,toc_pointer-base_addr(r1) /* set r2 to toc */ - lwz r1,stack_top-base_addr(r1) /* set r1 to stack_top */ - - addi r1,r1,-56-4 /* start stack at text_addr - 56 */ - addi r3,r0,0x0 /* clear r3 */ - stw r3, 0(r1) /* Clear stack chain */ - stw r3, 4(r1) - stw r3, 8(r1) - stw r3, 12(r1) - lis r5,environ@ha - la r5,environ@l(r5) /* environp */ - li r4, 0 /* argv */ - li r3, 0 /* argc */ - .extern SYM (boot_card) - b SYM (boot_card) /* call the first C routine */ - -/*--------------------------------------------------------------------------- - * bssclr. - *--------------------------------------------------------------------------*/ -bssclr: - /*------------------------------------------------------------------- - * Data move finished, zero out bss. - *------------------------------------------------------------------*/ - lwz r2,bss_addr-base_addr(r1) /* start of bss set by loader */ - lwz r3,bss_length-base_addr(r1) /* bss length */ - rlwinm. r3,r3,30,0x3FFFFFFF /* form length/4 */ - beqlr /* no bss */ - mtctr r3 /* set ctr reg */ - xor r6,r6,r6 /* r6 = 0 */ -clear_bss: - stswi r6,r2,0x4 /* store r6 */ - addi r2,r2,0x4 /* update r2 */ - bdnz clear_bss /* decrement counter and loop */ - blr /* return */ -.L_text_e: - - .comm environ,4,4 |