PRX
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Overview
Playstation Relocatable Executable (PRX)
Structure
First LOAD segment p_paddr points to module info.
Module Info
| Offset | Type | Description |
|---|---|---|
| 0 | short | Module attributes |
| 2 | char[2] | Module version |
| 4 | char[28] | Module name |
| 0x20 | long | TOC address |
| 0x24 | long | Pointer to the start of exports section |
| 0x28 | long | Pointer to end of exports section |
| 0x2C | long | Points to the start of imports section |
| 0x30 | long | Points to the end of imports section |
Exports
| Offset | Type | Description |
|---|---|---|
| 0 | char[2] | Structure size (0x1C 32-bit or 0x28 64-bit), padding |
| 2 | short | Version |
| 4 | short | Attributes |
| 6 | short | Number of functions |
| 8 | short | Number of variables |
| 0xA | short | Number of thread local storage variables |
| 0xC | char | Hash info |
| 0xD | char | Thread local storage hash info |
| 0xE | char[2] | Reserved |
| 0x10 | long | Pointer to exported library name |
| 0x14 | long | Pointer to function NID table |
| 0x18 | long | Pointer to function stub table |
Imports
| Offset | Type | Description |
|---|---|---|
| 0 | char | Structure size (0x2C) |
| 1 | char | Unused |
| 2 | short | Version |
| 4 | short | Attributes. AUTO_EXPORT=0x0001, WEAK_EXPORT=0x0002, NOLINK_EXPORT=0x0004, WEAK_IMPORT=0x0008, 0x2000 seems to indicate a non-PRX library (like "stdc" or "allocator") that comes from somewhere else (LV2?) |
| 6 | short | Number of functions |
| 8 | short | Number of variables |
| 0xA | short | Number of thread local storage variables |
| 0xC | byte[4] | reserved |
| 0x10 | long | Pointer to imported library name. |
| 0x14 | long | Pointer to the list of NID's for the exported functions. |
| 0x18 | long | Pointer to the list of exported functions. |
| 0x1C | long | var_nid_table |
| 0x20 | long | var_entry_table |
| 0x24 | long | tls_nid_table |
| 0x28 | long | tls_entry_table |
Relocations
PS3
Relocations can be found in either PT_SCE_PPURELA segments or SHT_SCE_PPURELA / SHT_RELA sections. RELA relocations are standard relocations while PPURELA relocations have 2 segment (program header) indexes stored in r_sym of r_info.
- The first index can be extracted with 0x7FFFFF00 as a mask and is used as a base address for r_addend. This sum will be the value applied to the patch.
- The second index can be extracted with 0x000000FF as a mask and is used as a base address for the target segment to patch and is added to r_offset.
- The first bit (0x80000000) is also set on earlier PRX's but it is currently unknown what it is used for.
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