mirror of
https://gitlab.rtems.org/rtems/rtos/rtems.git
synced 2025-12-05 15:15:44 +00:00
fixed RCS Id
This commit is contained in:
Joel Sherrill
249
c/src/lib/libbsp/powerpc/papyrus/dlentry/dlentry.s
Normal file
249
c/src/lib/libbsp/powerpc/papyrus/dlentry/dlentry.s
Normal file
@@ -0,0 +1,249 @@
|
||||
/* dlentry.s 1.0 - 95/08/08
|
||||
*
|
||||
* This file contains the entry veneer for RTEMS programs
|
||||
* downloaded to Papyrus.
|
||||
*
|
||||
* Author: Andrew Bray <andy@i-cubed.demon.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.
|
||||
*/
|
||||
|
||||
#include "asm.h"
|
||||
|
||||
/*
|
||||
* The Papyrus ELF link scripts support three special sections:
|
||||
* .entry The actual entry point, this must contain less
|
||||
* than 256 bytes of code/data to fit below the
|
||||
* .vectors section. This always preceeds any other
|
||||
* code or data.
|
||||
* .vectors The section containing the interrupt entry veneers.
|
||||
* .entry2 Any code overflowing from .entry
|
||||
* .descriptors The PowerOpen function indirection blocks.
|
||||
*/
|
||||
|
||||
/*
|
||||
* 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
|
||||
* .entry2
|
||||
* .text
|
||||
* .descriptors
|
||||
* .data
|
||||
* .bss
|
||||
* usually starting from 0x00020000.
|
||||
*
|
||||
* The initial stack is set to run BELOW the code base address.
|
||||
*
|
||||
* All the entry veneer has to do is to clear the BSS.
|
||||
*/
|
||||
|
||||
/*
|
||||
* GDB likes to have debugging information for the entry veneer.
|
||||
* Here is some DWARF information.
|
||||
*/
|
||||
|
||||
#if PPC_ASM == PPC_ASM_ELF
|
||||
.section .entry,"ax",@progbits
|
||||
.L_text_b:
|
||||
.L_LC1:
|
||||
.previous
|
||||
|
||||
.section .debug_sfnames
|
||||
.L_sfnames_b:
|
||||
.byte "/home/andy/powerpc/rtems-3.2.0/c/src/lib/libcpu/ppc/ppc403/dlentry/"
|
||||
.byte 0
|
||||
.L_F0:
|
||||
.byte "dlentry.s"
|
||||
.byte 0
|
||||
.previous
|
||||
|
||||
.section .line
|
||||
.L_line_b:
|
||||
.4byte .L_line_e-.L_line_b
|
||||
.4byte .L_text_b
|
||||
.L_LE1:
|
||||
.L_line_last:
|
||||
.4byte 0x0
|
||||
.2byte 0xffff
|
||||
.4byte .L_text_e-.L_text_b
|
||||
.L_line_e:
|
||||
.previous
|
||||
|
||||
.section .debug_srcinfo
|
||||
.L_srcinfo_b:
|
||||
.4byte .L_line_b
|
||||
.4byte .L_sfnames_b
|
||||
.4byte .L_text_b
|
||||
.4byte .L_text_e
|
||||
.4byte 0xffffffff
|
||||
.4byte .L_LE1-.L_line_b
|
||||
.4byte .L_F0-.L_sfnames_b
|
||||
.4byte .L_line_last-.L_line_b
|
||||
.4byte 0xffffffff
|
||||
.previous
|
||||
|
||||
.section .debug_pubnames
|
||||
.4byte .L_debug_b
|
||||
.4byte .L_P0
|
||||
.byte "download_entry"
|
||||
.byte 0
|
||||
.4byte 0x0
|
||||
.byte 0
|
||||
.previous
|
||||
|
||||
.section .debug_aranges
|
||||
.4byte .L_debug_b
|
||||
.4byte .L_text_b
|
||||
.4byte .L_text_e-.L_text_b
|
||||
.4byte 0
|
||||
.4byte 0
|
||||
.4byte 0
|
||||
.4byte 0
|
||||
.4byte 0
|
||||
.4byte 0
|
||||
.4byte 0x0
|
||||
.4byte 0x0
|
||||
.previous
|
||||
|
||||
.section .debug
|
||||
.L_debug_b:
|
||||
.L_D1:
|
||||
.4byte .L_D1_e-.L_D1
|
||||
.2byte 0x11 /* TAG_compile_unit */
|
||||
.2byte 0x12 /* AT_sibling */
|
||||
.4byte .L_D2
|
||||
.2byte 0x38 /* AT_name */
|
||||
.byte "dlentry.s"
|
||||
.byte 0
|
||||
.2byte 0x258 /* AT_producer */
|
||||
.byte "GAS 2.5.2"
|
||||
.byte 0
|
||||
.2byte 0x111 /* AT_low_pc */
|
||||
.4byte .L_text_b
|
||||
.2byte 0x121 /* AT_high_pc */
|
||||
.4byte .L_text_e
|
||||
.2byte 0x106 /* AT_stmt_list */
|
||||
.4byte .L_line_b
|
||||
.2byte 0x1b8 /* AT_comp_dir */
|
||||
.byte "/home/andy/powerpc/rtems-3.2.0/c/src/lib/libcpu/ppc/ppc403/dlentry/"
|
||||
.byte 0
|
||||
.2byte 0x8006 /* AT_sf_names */
|
||||
.4byte .L_sfnames_b
|
||||
.2byte 0x8016 /* AT_src_info */
|
||||
.4byte .L_srcinfo_b
|
||||
.L_D1_e:
|
||||
.L_P0:
|
||||
.L_D3:
|
||||
.4byte .L_D3_e-.L_D3
|
||||
.2byte 0x6 /* TAG_global_subroutine */
|
||||
.2byte 0x12 /* AT_sibling */
|
||||
.4byte .L_D4
|
||||
.2byte 0x38 /* AT_name */
|
||||
.byte "download_entry"
|
||||
.byte 0
|
||||
.2byte 0x278 /* AT_prototyped */
|
||||
.byte 0
|
||||
.2byte 0x111 /* AT_low_pc */
|
||||
.4byte .L_text_b
|
||||
.2byte 0x121 /* AT_high_pc */
|
||||
.4byte .L_text_e
|
||||
.2byte 0x8041 /* AT_body_begin */
|
||||
.4byte .L_text_b
|
||||
.2byte 0x8051 /* AT_body_end */
|
||||
.4byte .L_text_e
|
||||
.L_D3_e:
|
||||
|
||||
.L_D4:
|
||||
.4byte .L_D4_e-.L_D4
|
||||
.align 2
|
||||
.L_D4_e:
|
||||
.L_D2:
|
||||
.previous
|
||||
#endif
|
||||
|
||||
/*-------------------------------------------------------------------------------
|
||||
* ROM Vector area.
|
||||
*------------------------------------------------------------------------------*/
|
||||
#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
|
||||
/*-------------------------------------------------------------------------------
|
||||
* Reset_entry.
|
||||
*------------------------------------------------------------------------------*/
|
||||
.startup:
|
||||
/* Get start address, stack grows down from here... */
|
||||
mflr r1
|
||||
|
||||
/* Assume Bank regs set up..., cache etc. */
|
||||
bl bssclr
|
||||
|
||||
/*-----------------------------------------------------------------------
|
||||
* C_setup.
|
||||
*----------------------------------------------------------------------*/
|
||||
lwz r2,toc_pointer-base_addr(r1) /* set r2 to toc */
|
||||
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)
|
||||
.extern .main
|
||||
b .main /* 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 r3,r2,0x4 /* update r2 */
|
||||
bdnz clear_bss /* decrement counter and loop */
|
||||
blr /* return */
|
||||
.L_text_e:
|
||||
|
||||
#if PPC_ABI == PPC_ABI_POWEROPEN
|
||||
DESCRIPTOR (startup)
|
||||
#endif
|
||||
Reference in New Issue
Block a user