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Containers packed in single .elf file

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This commit is contained in:
Bahadir Balban
2009-09-16 16:24:56 +03:00
parent 0142677c81
commit ee44a2007a
4 changed files with 27 additions and 61 deletions
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3
SConstruct.loader
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@@ -19,12 +19,11 @@ LIBC_PATH = 'loader/libs/c'
LIBC_LIBPATH = LIBC_PATH
LIBC_INCPATH = ['#' + join(LIBC_PATH, 'include'), \
'#' + join(LIBC_PATH, 'include/arch/' + arch)]
LIBC_CRT_PATH = '#' + join(LIBC_PATH, "crt/sys-baremetal/arch-" + arch + "/crt0.o")
LIBELF_PATH = 'loader/libs/elf'
LIBELF_LIBPATH = LIBELF_PATH
LIBELF_INCPATH = '#' + join(LIBELF_PATH, 'include')
env = Environment(CC = 'arm-none-eabi-gcc',
# We don't use -nostdinc because sometimes we need standard headers,
# such as stdarg.h e.g. for variable args, as in printk().

24
loader/linker.lds
View File

@@ -1,7 +1,7 @@
/*
* Simple linker script for userspace or svc tasks.
* Linker script that packs all containers in loader image.
*
* Copyright (C) 2007 Bahadir Balban
* Copyright (C) 2007-2009 B Labs Ltd.
*/
ENTRY(_start)
@@ -13,23 +13,17 @@ SECTIONS
.rodata1 : { *(.rodata1) }
.data :
{
*(.data)
_start_kernel = .;
*(.kernel)
_end_kernel = .;
_start_bootdesc = .;
*(.bootdesc)
_end_bootdesc = .;
_start_mm0 = .;
*(.mm0)
_end_mm0 = .;
_start_fs0 = .;
*(.fs0)
_end_fs0 = .;
_start_test0 = .;
*(.test0)
_end_test0 = .;
*(.data)
}
_start_containers = .;
.cont.0 : { *(.cont.0) }
.cont.1 : { *(.cont.1) }
_end_containers = .;
.got : { *(.got) *(.got.plt) }
.bss : { *(.bss) }
}

26
loader/main.c
View File

@@ -1,29 +1,37 @@
#include <elf/elf.h>
#include <stdio.h>
#include <stdlib.h>
#include "arch.h"
/* These symbols are defined by the linker scripts. */
/* These symbols are defined by the linker script. */
extern char _start_kernel[];
extern char _end_kernel[];
extern char _start_containers[];
extern char _end_containers[];
/* This is a kernel symbol exported to loader's linker script from kernel build */
extern char bkpt_phys_to_virt[];
int
main(void)
void load_container_images(unsigned long start, unsigned long end)
{
void *kernel_entry = NULL;
struct elf_image *elf_img = (struct elf_image *)start;
int nsect_headers;
// Find all section headers
}
int main(void)
{
void *kernel_entry = 0;
arch_init();
printf("elf-loader:\tStarted\n");
printf("ELF Loader: Started.\n");
printf("Loading the kernel...\n");
// load_image(&kernel_entry, _start_kernel, _end_kernel);
load_elf_image(&kernel_entry, _start_kernel, _end_kernel);
printf("Loading containers...\n");
load_container_images(_start_containers, _end_containers)
printf("elf-loader:\tkernel entry point is %p\n", kernel_entry);
// arch_start_kernel(kernel_entry);

35
loader/pre-build.py
View File

@@ -1,35 +0,0 @@
# -*- mode: python; coding: utf-8; -*-
#
# Codezero -- a microkernel for embedded systems.
#
# Copyright © 2009 B Labs Ltd
import os, sys, shelve
# Convert address from python literal to numeric value
def address_remove_literal(address):
value = hex(int(address, 16) - 0xf0000000)
if value[-1] in ['l', 'L']:
value = value[:-1]
return value
ksym_header = \
'''
/*
* %s autogenerated from %s.
*
* This file is included by the loader sources so that any
* kernel symbol address can be known in advance and stopped
* at by debuggers before virtual memory is enabled.
*/
'''
symbol_section = \
'''
.section .text
.align 4
.global %s
.type %s, function
.equ %s, %s
'''