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/* $OpenBSD: start.S,v 1.3 2018/03/31 18:07:14 patrick Exp $ */
/*-
* Copyright (c) 2014, 2015 Andrew Turner
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD: head/sys/boot/efi/loader/arch/arm/start.S 282727 2015-05-10 13:24:26Z ian $
*/
#include <machine/asm.h>
/*
* We need to be a PE32 file for EFI. On some architectures we can use
* objcopy to create the correct file, however on arm we need to do
* it ourselves.
*/
#define IMAGE_FILE_MACHINE_ARM 0x01c2
#define IMAGE_SCN_CNT_CODE 0x00000020
#define IMAGE_SCN_CNT_INITIALIZED_DATA 0x00000040
#define IMAGE_SCN_MEM_DISCARDABLE 0x02000000
#define IMAGE_SCN_MEM_EXECUTE 0x20000000
#define IMAGE_SCN_MEM_READ 0x40000000
.section .peheader, "a"
efi_start:
/* The MS-DOS Stub, only used to get the offset of the COFF header */
.ascii "MZ"
.short 0
.space 0x38
.long pe_sig - efi_start
/* The PE32 Signature. Needs to be 8-byte aligned */
.align 3
pe_sig:
.ascii "PE"
.short 0
coff_head:
.short IMAGE_FILE_MACHINE_ARM /* ARM file */
.short 2 /* 2 Sections */
.long 0 /* Timestamp */
.long 0 /* No symbol table */
.long 0 /* No symbols */
.short section_table - optional_header /* Optional header size */
.short 0 /* Characteristics TODO: Fill in */
optional_header:
.short 0x010b /* PE32 (32-bit addressing) */
.byte 0 /* Major linker version */
.byte 0 /* Minor linker version */
.long _edata - _end_header /* Code size */
.long 0 /* No initialized data */
.long 0 /* No uninitialized data */
.long _start - efi_start /* Entry point */
.long _end_header - efi_start /* Start of code */
.long 0 /* Start of data */
optional_windows_header:
.long 0 /* Image base */
.long 32 /* Section Alignment */
.long 8 /* File alignment */
.short 0 /* Major OS version */
.short 0 /* Minor OS version */
.short 0 /* Major image version */
.short 0 /* Minor image version */
.short 0 /* Major subsystem version */
.short 0 /* Minor subsystem version */
.long 0 /* Win32 version */
.long _edata - efi_start /* Image size */
.long _end_header - efi_start /* Header size */
.long 0 /* Checksum */
.short 0xa /* Subsystem (EFI app) */
.short 0 /* DLL Characteristics */
.long 0 /* Stack reserve */
.long 0 /* Stack commit */
.long 0 /* Heap reserve */
.long 0 /* Heap commit */
.long 0 /* Loader flags */
.long 6 /* Number of RVAs */
/* RVAs: */
.quad 0
.quad 0
.quad 0
.quad 0
.quad 0
.quad 0
section_table:
/* We need a .reloc section for EFI */
.ascii ".reloc"
.byte 0
.byte 0 /* Pad to 8 bytes */
.long 0 /* Virtual size */
.long 0 /* Virtual address */
.long 0 /* Size of raw data */
.long 0 /* Pointer to raw data */
.long 0 /* Pointer to relocations */
.long 0 /* Pointer to line numbers */
.short 0 /* Number of relocations */
.short 0 /* Number of line numbers */
.long (IMAGE_SCN_CNT_INITIALIZED_DATA | IMAGE_SCN_MEM_READ | \
IMAGE_SCN_MEM_DISCARDABLE) /* Characteristics */
/* The contents of the loader */
.ascii ".text"
.byte 0
.byte 0
.byte 0 /* Pad to 8 bytes */
.long _edata - _end_header /* Virtual size */
.long _end_header - efi_start /* Virtual address */
.long _edata - _end_header /* Size of raw data */
.long _end_header - efi_start /* Pointer to raw data */
.long 0 /* Pointer to relocations */
.long 0 /* Pointer to line numbers */
.short 0 /* Number of relocations */
.short 0 /* Number of line numbers */
.long (IMAGE_SCN_CNT_CODE | IMAGE_SCN_MEM_EXECUTE | \
IMAGE_SCN_MEM_READ) /* Characteristics */
_end_header:
.text
_start:
/* Save the boot params to the stack */
push {r0, r1}
adr r0, .Lbase
ldr r1, [r0]
sub r5, r0, r1
ldr r0, .Limagebase
add r0, r0, r5
ldr r1, .Ldynamic
add r1, r1, r5
bl _C_LABEL(self_reloc)
/* Zero the BSS, _reloc fixed the values for us */
ldr r0, .Lbss
ldr r1, .Lbssend
mov r2, #0
1: cmp r0, r1
bge 2f
str r2, [r0], #4
b 1b
2:
pop {r0, r1}
bl _C_LABEL(efi_main)
1: b 1b
.Lbase:
.word .
.Limagebase:
.word ImageBase
.Ldynamic:
.word _DYNAMIC
.Lbss:
.word __bss_start
.Lbssend:
.word __bss_end
.align 3
stack:
.space 512
stack_end:
|
