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Add chainloader (stage2) (need to edit more files)

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This commit is contained in:
TuxSH 2018-05-07 01:02:23 +02:00
parent 2c07b5a2fb
commit 75dfcd07a9
4 changed files with 67 additions and 14 deletions
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42
fusee/fusee-secondary/linker.ld
View file

@ -3,6 +3,12 @@ OUTPUT_ARCH(arm)
ENTRY(_start)
/* Mostly copied from https://github.com/devkitPro/buildscripts/blob/master/dkarm-eabi/crtls/3dsx.ld */
MEMORY
{
NULL : ORIGIN = 0x00000000, LENGTH = 0x1000
main : ORIGIN = 0xFFF00000, LENGTH = 0x00100000
low_iram : ORIGIN = 0x40003000, LENGTH = 0x4000
}
SECTIONS
{
@ -30,7 +36,7 @@ SECTIONS
/* .fini */
KEEP( *(.fini) )
. = ALIGN(4);
}
} >main
.rodata :
{
@ -41,14 +47,14 @@ SECTIONS
*(.gnu.linkonce.r*)
SORT(CONSTRUCTORS)
. = ALIGN(4);
}
} >main
.preinit_array ALIGN(4) :
{
PROVIDE (__preinit_array_start = .);
KEEP (*(.preinit_array))
PROVIDE (__preinit_array_end = .);
}
} >main
.init_array ALIGN(4) :
{
@ -56,7 +62,7 @@ SECTIONS
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array))
PROVIDE (__init_array_end = .);
}
} >main
.fini_array ALIGN(4) :
{
@ -64,7 +70,7 @@ SECTIONS
KEEP (*(.fini_array))
KEEP (*(SORT(.fini_array.*)))
PROVIDE (__fini_array_end = .);
}
} >main
.ctors ALIGN(4) :
{
@ -72,7 +78,7 @@ SECTIONS
KEEP (*(EXCLUDE_FILE (*crtend.o) .ctors))
KEEP (*(SORT(.ctors.*)))
KEEP (*(.ctors))
}
} >main
.dtors ALIGN(4) :
{
@ -80,11 +86,11 @@ SECTIONS
KEEP (*(EXCLUDE_FILE (*crtend.o) .dtors))
KEEP (*(SORT(.dtors.*)))
KEEP (*(.dtors))
}
} >main
.ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) }
.ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >main
__exidx_start = .;
ARM.exidx : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) }
ARM.exidx : { *(.ARM.exidx* .gnu.linkonce.armexidx.*) } >main
__exidx_end = .;
.data :
@ -94,19 +100,31 @@ SECTIONS
*(.gnu.linkonce.d*)
CONSTRUCTORS
. = ALIGN(4);
}
} >main
.chainloader :
{
. = ALIGN(32);
KEEP(*(.chainloader.text.start))
build/chainloader.o(.text*)
build/chainloader.o(.rodata*)
build/chainloader.o(.data*)
. = ALIGN(8);
build/chainloader.o(.bss*)
. = ALIGN(32);
} >low_iram
__bss_start__ = ALIGN(32);
.bss :
{
__bss_start__ = ALIGN(32);
*(.dynbss)
*(.bss)
*(.bss.*)
*(.gnu.linkonce.b*)
*(COMMON)
. = ALIGN(8);
}
__bss_end__ = .;
} >main
__end__ = ABSOLUTE(.) ;
/* ==================

12
fusee/fusee-secondary/src/chainloader.c Normal file
View file

@ -0,0 +1,12 @@
#include "chainloader.h"
uint8_t g_payload_arg_data[PAYLOAD_ARG_DATA_MAX_SIZE] = {1};
#pragma GCC optimize (3)
void relocate_and_chainload_main(uintptr_t load_address, uintptr_t src_address, size_t size, int argc) {
for(size_t i = 0; i < size; i++) {
*(uint8_t *)(load_address + i) = *(uint8_t *)(src_address + i);
}
((void (*)(int, void *))load_address)(argc, g_payload_arg_data);
}

13
fusee/fusee-secondary/src/chainloader.h Normal file
View file

@ -0,0 +1,13 @@
#ifndef FUSEE_CHAINLOADER_H
#define FUSEE_CHAINLOADER_H
#include <stddef.h>
#include <stdint.h>
#define PAYLOAD_ARG_DATA_MAX_SIZE 0x1000
extern uint8_t g_payload_arg_data[PAYLOAD_ARG_DATA_MAX_SIZE];
void relocate_and_chainload(uintptr_t load_address, uintptr_t src_address, size_t size, int argc);
#endif

12
fusee/fusee-secondary/src/start.s
View file

@ -2,10 +2,11 @@
mov r\@, #0
.endm
.section .text.start
.section .text.start, "ax", %progbits
.arm
.align 5
.global _start
.type _start, %function
_start:
/* Insert NOPs for convenience (i.e. to use Nintendo's BCTs, for example) */
.rept 16
@ -57,3 +58,12 @@ _start:
ldmfd sp!, {r0, r1}
bl main
b .
.section .chainloader.text.start, "ax", %progbits
.arm
.align 5
.global relocate_and_chainload
.type relocate_and_chainload, %function
relocate_and_chainload:
ldr sp, =0x40010000
b relocate_and_chainload_main