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Weird behaviour with SceModule struct

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m0skit0

Joined: 02 Jun 2009
Posts: 226

Posted: Wed Jan 20, 2010 4:50 am Post subject: Weird behaviour with SceModule struct

I'm working on a PSP 2000 TA85v1 with 5.00 M33-4, using PSPSDK.

Here's my code:

Code:

fileio_module = sceKernelFindModuleByName("sceIOFileManager");
[...]
sceIoWrite(fd, &(fileio_module->text_addr), sizeof(u32));

I check the value written in the file, and found it is 0x8805EFC0. But psplink, on the same run, gives me this:

Code:

ms0:/> modinfo 0x00943901
UID: 0x00943901 Attr: 0007 - Name: sceIOFileManager
Entry: 0x880540F8 - GP: 0x8805EFC0 - TextAddr: 0x88050800

So text_addr is 0x88050800 (which is the correct value), not 0x8805EFC0, which is in fact the GP. But if I change my code to

Code:

sceIoWrite(fd, &(fileio_module->text_size), sizeof(u32));

Now in fact I'm writing the text_addr struct member. So obviously there's a 4 byte shift missing there.

Any clues why is this happening?
_________________

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Davee

Joined: 22 Jun 2009
Posts: 59

Posted: Thu Jan 21, 2010 2:42 am Post subject:

SceModule structure has always been incorrect.

Code:

typedef struct
{
SceModule * next; //0, 0x00
u16    attribute; //4, 0x04
u8       version[2]; //6, 0x06
char    modname[27]; //8, 0x08
char    terminal; //35, 0x23
u16    status; //36, 0x24 (AND 0x100 ? (usermodule) | (kernelmodule))
u16    padding; //38, 0x26
u32    unk_28; //40, 0x28
SceUID    modid; //44, 0x2C
SceUID    usermod_thid; //48, 0x30
SceUID    memid; //52, 0x34
SceUID    mpidtext; //56, 0x38
SceUID    mpiddata; //60, 0x3C
void *    ent_top; //64, 0x40
u32    ent_size; //68, 0x44
void *    stub_top; //72, 0x48
u32    stub_size; //76, 0x4C
int    (* module_start)(SceSize, void *); //80, 0x50
int    (* module_stop)(SceSize, void *); //84, 0x54
int    (* module_bootstart)(SceSize, void *); //88, 0x58
int    (* module_reboot_before)(SceSize, void *); //92, 0x5C
int    (* module_reboot_phase)(SceSize, void *); //96, 0x60
u32    entry_addr; //100, 0x64(seems to be repeated)
u32    gp_value; //104, 0x68
u32    text_addr; //108, 0x6C
u32    text_size; //112, 0x70
u32    data_size; //116, 0x74
u32    bss_size; //120, 0x78
u8       nsegment; //124, 0x7C
u8       padding[3]; //125, 0x7D
u32    segmentaddr[4]; //128, 0x80
u32    segmentsize[4]; //144, 0x90
int    module_start_thread_priority; //160, 0xA0
SceSize module_start_thread_stacksize; //164, 0xA4
SceUInt module_start_thread_attr; //168, 0xA8
int    module_stop_thread_priority; //172, 0xAC
SceSize module_stop_thread_stacksize; //176, 0xB0
SceUInt module_stop_thread_attr; //180, 0xB4
int    module_reboot_before_thread_priority; //184, 0xB8
SceSize module_reboot_before_thread_stacksize; //188, 0xBC
SceUInt module_reboot_before_thread_attr; //192, 0xC0
} SceModule;

Thats the one I reversed from 1.50. It's changed a little recently adding new things, but thats the most upto date version.

Coldbird

Joined: 08 Feb 2007
Posts: 155

Posted: Thu Jan 28, 2010 7:13 am Post subject:

SDK submit - nao! _________________ Been gone for some time. Now I'm back. Someone mind getting me up-2-date?

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