Editing Loaders

[[Category:Software]]
= Explaination =
Loaders are used for loading other modules.

Commonly found in [[Boot_Order#CoreOS_PKG_Filelisting|CoreOS]] and [[Flash]].


== Known loaders ==
{| class="wikitable"
|-
! Loader !! Location !! Type !! Remarks
|-
| bootldr || [[Flash]] || Boot Loader || primary loader from chain of trust
|-
| metldr || [[Flash]] || Meta Loader || aka asecure_loader. Loads other loaders
|-
| appldr || [[Boot_Order#CoreOS_PKG_Filelisting|CoreOS]] || Application Loader || loads userspace [f]selfs e.g. [[VSH|vsh.self]], videoplayer_plugin.sprx, disc EBOOT.BINs, NPDRM EBOOT.BINs
|-
| isoldr || [[Boot_Order#CoreOS_PKG_Filelisting|CoreOS]] || Isolation Loader || loading [[Iso module|isolated SPU modules]]
|-
| lv1ldr || [[Boot_Order#CoreOS_PKG_Filelisting|CoreOS]] || Hypervisor Loader || loads [[lv1.self]] ([[Hypervisor_Reverse_Engineering|Hypervisor]])
|- 
| lv2ldr || [[Boot_Order#CoreOS_PKG_Filelisting|CoreOS]] || Supervisor Loader || loads lv2_kernel.self (Supervisor kernel)
|-
|}

=== Stop Codes ===
{| class="wikitable"
|-
! Stop Code !! Module !! Remark 
|-
| 0x30 || isoldr/appldr || Version mismatch (isoldr version differs from version returned by SPU channel 73).
|-
| 0x16 || isoldr ||
|-
| 0x27 || appldr || SPU arg at 0x3E840
|-
| 0x20 || metldr || header error
|-
| 0x23 || metldr || ECDSA signature failure
|-
|}

0x27

When booting, lv1ldr store its version in this region writing to ch_72.<br />
isoldr asks for the version in two chuncks, if you want to pass version 3.41 (0x0003004100000000)

Note: this version check was recently added, maybe in fw 3.41

<pre>
//for ch_73_round_0
data0 = 0x00030041;
//for ch_73_round_1
data1 = 0x00000000;
</pre>

=== lv1ldr ===
Used for loading the hypervisor (lv1.self). It also handles some initialization of the ATA and ENCDEC subsystems.

==== LS Parameters Layout ====
{| class="wikitable"
|-
! Address !! Usage !! Comments
|-
| 0x34CB0 || QA Token (?)|| DMA read from ch74 20 times.
|-
| 0x3E000 || Wait flag || If (flag==0){wait;} // use 0xFF00000000ULL
|-
| 0x3E800 || Arguments ||
|}

=== lv2ldr ===
Used to verify and decrypt lv2 (lv2_kernel.self)

==== LS Parameters layout ====
{| class="wikitable"
|-
! Address !! Usage !! Comments
|-
| 0x3E000 || Wait flag || If (flag==0){wait;} // use 0xFF00000000ULL
|-
| 0x3E800 || Arguments ||
|-
| 0x3F000 || Program revoke list ||
|}

==== Arguments ====

{| class="wikitable"
|-
! Size !! Name !! Value
|-
|u64 || lpar_auth_id || 0x1070000002000001
|-
|u8 || *lv2_in || lv2 self - address in ram
|-
|u8 || *lv2_out || where to decrypt lv2 - address in ram
|-
|u64 || field18 || -1
|-
|u8[40] || res1 || Unknown / Not used
|-
|u64 || field48 || 1
|-
|u8[16] || res2 || Unknown / Not used
|}

=== isoldr ===
Used for loading isolated SPU modules.

==== LS Parameters layout ====
{| class="wikitable"
|-
! Address !! Usage !! Comments
|-
| 0x3E000 || Wait flag || If (flag==0){wait;} // use 0xFF00000000ULL
|-
| 0x3E400 || EID0 ||
|-
| 0x3E800 || Arguments ||
|-
| 0x3EC00 || QA-Token || If not used set to -1
|-
| 0x3F000 || Program revoke list ||
|}

==== Arguments ====

Depending which isolated module you want to load, you would need to pass it different arguments.
{| class="wikitable"
|-
! Size !! Name !! spp_verifier
|-
|u64 || prog_auth_id || 0x1050000003000001
|-
|u64 || lpar_auth_id || 0x1070000002000001
|-
|u64 || *spu_module || SPU - address in ram
|-
|u64 || *spu_module_arg1 || Profile - address in ram
|-
|u64 || spu_module_arg1_size || sizeof(profile)
|-
|u64 || *spu_module_arg2 || Not used
|-
|u64 || spu_module_arg2_size || Not used
|-
|u8 || res1[16] || Unknown 
|-
|u64 || field48 || 3
|-
|u8 res2[16] || Unknown
|}

{| class="wikitable"
|-
! Size !! Name !! aim_spu_module
|-
|u64 || prog_auth_id || 0x1050000003000001
|-
|u64 || lpar_auth_id || 0x1070000002000001
|-
|u64 || *spu_module || SPU - address in ram
|-
|u64 || *spu_module_arg1 || aim_spu_args - address in ram
|-
|u64 || spu_module_arg1_size || 0x80
|-
|u64 || *spu_module_arg2 || eid0 - address in ram
|-
|u64 || spu_module_arg2_size || sizeof(eid0)
|-
|u64 || field48 || 3
|}

<pre>
union aim_spu_args {
	struct {
		void *buf;           // debug_info buffer address
		u64 buf_size;        // debug_info buffer size
		u32 param;           // 0x01 device type, 0x02 device id, 0x03 pscode, 0x04 psid
	} in;

	struct {
		u8 result[0x10];     // no need to explain...
	} out;
};
</pre>