Atmosphere/fusee/fusee-secondary/src/start.s

220 lines
No EOL
5.1 KiB
ArmAsm

/*
* Copyright (c) 2018 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <atmosphere/version.h>
.macro CLEAR_GPR_REG_ITER
mov r\@, #0
.endm
.section .text.start, "ax", %progbits
.arm
.align 5
.global _start
.type _start, %function
_start:
b _crt0
.word (_metadata - _start)
_crt0:
/* Switch to system mode, mask all interrupts, clear all flags */
msr cpsr_cxsf, #0xDF
/* Relocate ourselves if necessary */
ldr r2, =_start
adr r3, _start
cmp r2, r3
beq _relocation_loop_end
ldr r4, =__bss_start__
sub r4, r4, r2 /* size >= 32, obviously, and weve declared 32-byte-alignment */
_relocation_loop:
ldmia r3!, {r5-r12}
stmia r2!, {r5-r12}
subs r4, #0x20
bne _relocation_loop
ldr r12, =_relocation_loop_end
bx r12
_relocation_loop_end:
/* Set the stack pointer */
ldr sp, =__stack_top__
mov fp, #0
bl __program_init
/* Set r0 to r12 to 0 (for debugging) & call main */
.rept 13
CLEAR_GPR_REG_ITER
.endr
ldr r0, =__program_argc
ldr r1, =__program_argv
ldr lr, =__program_exit
ldr r0, [r0]
ldr r1, [r1]
b main
/* Fusee-secondary header. */
.align 5
_metadata:
.ascii "FSS0"
.word __total_size__
.word (_crt0 - _start)
.word (_content_headers - _start)
.word (_content_headers_end - _content_headers) / 0x20 /* Number of content headers */
.word ((ATMOSPHERE_SUPPORTED_HOS_VERSION_MAJOR << 24) | (ATMOSPHERE_SUPPORTED_HOS_VERSION_MINOR << 16) | (ATMOSPHERE_SUPPORTED_HOS_VERSION_MICRO << 8) | (0x0))
.word ((ATMOSPHERE_RELEASE_VERSION_MAJOR << 24) | (ATMOSPHERE_RELEASE_VERSION_MINOR << 16) | (ATMOSPHERE_RELEASE_VERSION_MICRO << 8) | (0x0))
#define TO_WORD(x) TO_WORD_(x)
#define TO_WORD_(x) 0x##x
#define AMS_GIT_REV_WORD TO_WORD(ATMOSPHERE_GIT_HASH)
.word AMS_GIT_REV_WORD
#undef TO_WORD_
#undef TO_WORD
#define CONTENT_TYPE_FSP 0
#define CONTENT_TYPE_EXO 1
#define CONTENT_TYPE_WBT 2
#define CONTENT_TYPE_RBT 3
#define CONTENT_TYPE_SP1 4
#define CONTENT_TYPE_SP2 5
#define CONTENT_TYPE_KIP 6
#define CONTENT_TYPE_BMP 7
_content_headers:
/* ams_mitm content header */
.word __ams_mitm_kip_start__
.word __ams_mitm_kip_size__
.word CONTENT_TYPE_KIP
.word 0xCCCCCCCC
.asciz "ams_mitm"
.align 5
/* boot_100 content header */
.word __boot_100_kip_start__
.word __boot_100_kip_size__
.word CONTENT_TYPE_KIP
.word 0xCCCCCCCC
.asciz "boot_100"
.align 5
/* boot_200 content header */
.word __boot_200_kip_start__
.word __boot_200_kip_size__
.word CONTENT_TYPE_KIP
.word 0xCCCCCCCC
.asciz "boot_200"
.align 5
/* exosphere content header */
.word __exosphere_bin_start__
.word __exosphere_bin_size__
.word CONTENT_TYPE_EXO
.word 0xCCCCCCCC
.asciz "exosphere"
.align 5
/* fusee_primary content header */
.word __fusee_primary_bin_start__
.word __fusee_primary_bin_size__
.word CONTENT_TYPE_FSP
.word 0xCCCCCCCC
.asciz "fusee_primary"
.align 5
/* loader content header */
.word __loader_kip_start__
.word __loader_kip_size__
.word CONTENT_TYPE_KIP
.word 0xCCCCCCCC
.asciz "loader"
.align 5
/* lp0fw content header */
.word __lp0fw_bin_start__
.word __lp0fw_bin_size__
.word CONTENT_TYPE_WBT
.word 0xCCCCCCCC
.asciz "lp0fw"
.align 5
/* pm content header */
.word __pm_kip_start__
.word __pm_kip_size__
.word CONTENT_TYPE_KIP
.word 0xCCCCCCCC
.asciz "pm"
.align 5
/* rebootstub content header */
.word __rebootstub_bin_start__
.word __rebootstub_bin_size__
.word CONTENT_TYPE_RBT
.word 0xCCCCCCCC
.asciz "rebootstub"
.align 5
/* sept_primary content header */
.word __sept_primary_bin_start__
.word __sept_primary_bin_size__
.word CONTENT_TYPE_SP1
.word 0xCCCCCCCC
.asciz "sept_primary"
.align 5
/* sept_secondary content header */
.word __sept_secondary_enc_start__
.word __sept_secondary_enc_size__
.word CONTENT_TYPE_SP2
.word 0xCCCCCCCC
.asciz "sept_secondary"
.align 5
/* sm content header */
.word __sm_kip_start__
.word __sm_kip_size__
.word CONTENT_TYPE_KIP
.word 0xCCCCCCCC
.asciz "sm"
.align 5
/* splash_screen content header */
.word __splash_screen_bmp_start__
.word __splash_screen_bmp_size__
.word CONTENT_TYPE_BMP
.word 0xCCCCCCCC
.asciz "splash_screen"
.align 5
_content_headers_end:
/* No need to include this in normal programs: */
.section .chainloader.text.start, "ax", %progbits
.arm
.align 5
.global relocate_and_chainload
.type relocate_and_chainload, %function
relocate_and_chainload:
ldr sp, =__stack_top__
b relocate_and_chainload_main
.section .nxboot.text.start, "ax", %progbits
.arm
.align 5
.global nxboot
.type nxboot, %function
nxboot:
ldr sp, =__stack_top__
b nxboot_finish