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pkg2: Improve Ini1 kernel offset code per hekate

This commit is contained in:
shchmue 2020-04-14 15:10:51 -06:00
parent ef6676d3b9
commit a7d20c5814
2 changed files with 26 additions and 6 deletions
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26
source/hos/pkg2.c
View File

@ -1,6 +1,6 @@
/*
* Copyright (c) 2018 naehrwert
* Copyright (c) 2018-2019 CTCaer
* Copyright (c) 2018-2020 CTCaer
* Copyright (c) 2018 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
@ -41,8 +41,28 @@ static u32 _pkg2_calc_kip1_size(pkg2_kip1_t *kip1)
void pkg2_get_newkern_info(u8 *kern_data)
{
u32 info_op = *(u32 *)(kern_data + PKG2_NEWKERN_GET_INI1);
pkg2_newkern_ini1_val = ((info_op & 0xFFFF) >> 3) + PKG2_NEWKERN_GET_INI1; // Parse ADR and PC.
u32 pkg2_newkern_ini1_off = 0;
pkg2_newkern_ini1_start = 0;
// Find static OP offset that is close to INI1 offset.
u32 counter_ops = 0x100;
while (counter_ops)
{
if (*(u32 *)(kern_data + 0x100 - counter_ops) == PKG2_NEWKERN_GET_INI1_HEURISTIC)
{
pkg2_newkern_ini1_off = 0x100 - counter_ops + 12; // OP found. Add 12 for the INI1 offset.
break;
}
counter_ops -= 4;
}
// Offset not found?
if (!counter_ops)
return;
u32 info_op = *(u32 *)(kern_data + pkg2_newkern_ini1_off);
pkg2_newkern_ini1_val = ((info_op & 0xFFFF) >> 3) + pkg2_newkern_ini1_off; // Parse ADR and PC.
pkg2_newkern_ini1_start = *(u32 *)(kern_data + pkg2_newkern_ini1_val);
pkg2_newkern_ini1_end = *(u32 *)(kern_data + pkg2_newkern_ini1_val + 0x8);

4
source/hos/pkg2.h
View File

@ -1,6 +1,6 @@
/*
* Copyright (c) 2018 naehrwert
* Copyright (C) 2018-2019 CTCaer
* Copyright (C) 2018-2020 CTCaer
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
@ -26,7 +26,7 @@
#define PKG2_SEC_KERNEL 0
#define PKG2_SEC_INI1 1
#define PKG2_NEWKERN_GET_INI1 0x44
#define PKG2_NEWKERN_GET_INI1_HEURISTIC 0xD2800015 // Offset of OP + 12 is the INI1 offset.
u32 pkg2_newkern_ini1_val;
u32 pkg2_newkern_ini1_start;