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_BenJi
Joined: 16 Jan 2008
Posts: 7
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 Posted: Wed Jan 16, 2008 6:42 am Post subject: Reboot after sctrlKernelLoadExecVSHMs2 |
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Hi,
I'm using 'sctrlKernelLoadExecVSHMs2' to launch an homebrew in my own plugin, but when the launched hombrew stop, the psp restart itself...
Is it normal ? Or do I something wrong ? |
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Hellcat
Joined: 24 Jan 2007
Posts: 84
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| Posted: Wed Jan 16, 2008 8:33 pm Post subject: |
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How does the homebrew exit?
If it's using sceKernelExitGame() the reboot is pretty much the way it's supposed to go, yes.... |
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_BenJi
Joined: 16 Jan 2008
Posts: 7
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| Posted: Thu Jan 17, 2008 6:32 am Post subject: |
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I don't know :P
I've just tried with an hombrew using sceKernelExitGame() and yes, it reset the PSP. But if I launch this hombrew directly from the XMB, when it stops, the PSP go back on the XMB.
Is there a meaning to avoid the reset ? |
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Hellcat
Joined: 24 Jan 2007
Posts: 84
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| Posted: Thu Jan 17, 2008 12:32 pm Post subject: |
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The return to the XMB actually is a reboot, but it skips the coldboot sequence usually in that case.
Only thing I could think of at the moment to prevent the reboot would be to patch/redirect the sceKernelExitGame() syscall to a function of your own that goes back into your app, instead of rebooting the PSP. |
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_BenJi
Joined: 16 Jan 2008
Posts: 7
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| Posted: Fri Jan 18, 2008 3:57 am Post subject: |
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Ok... but why that doens't skip the coldboot here ? :(
I'll try to find how to patch/redirect the sceKernelExitGame() |
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moonlight
Joined: 26 Oct 2005
Posts: 567
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| Posted: Fri Jan 18, 2008 5:48 am Post subject: |
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| _BenJi wrote: | Ok... but why that doens't skip the coldboot here ? :(
I'll try to find how to patch/redirect the sceKernelExitGame() |
You have to pass certain params in the vshmain_args fields of the structure, as the XMB does. |
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Cpasjuste
Joined: 29 May 2005
Posts: 214
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| Posted: Fri Jan 18, 2008 6:00 am Post subject: |
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| _BenJi wrote: | Ok... but why that doens't skip the coldboot here ? :(
I'll try to find how to patch/redirect the sceKernelExitGame() |
If your goal is to hook the sceKernelExitGame function, you can take a look at the excellent psplink sources on svn (look at psplink.c i think). |
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_BenJi
Joined: 16 Jan 2008
Posts: 7
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| Posted: Fri Jan 18, 2008 8:01 am Post subject: |
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| moonlight wrote: | | You have to pass certain params in the vshmain_args fields of the structure, as the XMB does. |
I don't find the correct params ; I looked at the source of Dark_Alex's 1.5 POC, but the params to skip the coldboot doesn't work here... It may have changed for a while.
But it can be found somewhere... ahhhhhh
I'll have a look at psplink sources...
EDIT: http://forums.ps2dev.org/viewtopic.php?p=42242#42242 that doesn't work :/ (it's like in the source that I mentioned above) |
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_BenJi
Joined: 16 Jan 2008
Posts: 7
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| Posted: Sat Jan 19, 2008 9:31 pm Post subject: |
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Well, does somebody know what is correct the vshmain_args ?
I looked at the psplink sources, but it uses functions that require kernel mode, and on my psp slim I cannot use them. Is it possible to hook function without being in kernel mode ? |
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Hellcat
Joined: 24 Jan 2007
Posts: 84
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| Posted: Sun Jan 20, 2008 2:13 am Post subject: |
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| _BenJi wrote: | | Is it possible to hook function without being in kernel mode ? |
I don't think so, I doubt the memory parts you have to manipulate are writable from usermose.... didn't try so far, always put my hooking/patching stuff in a kernel module, since I anticipate it failing in usermode anyway.... worth a try ;)
However, you could make a simple replacement vshmain.prx that dumps the arguments passed to it into a file.... |
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moonlight
Joined: 26 Oct 2005
Posts: 567
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| Posted: Sun Jan 20, 2008 6:44 pm Post subject: |
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This is what i dumped within vshctrl in 3.80.
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u8 vshmain_args[0x400];
struct SceKernelLoadExecVSHParam param;
memset(vshmain_args, 0, sizeof(vshmain_args));
vshmain_args[0x40] = 1;
vshmain_args[0x280] = 1;
vshmain_args[0x284] = 3;
vshmain_args[0x286] = 5;
memset(¶m, 0, sizeof(param));
param.size = sizeof(param);
param.args = strlen(EBOOT) + 1;
param.argp = EBOOT;
param.key = "game";
param.vshmain_args_size = sizeof(vshmain_args);
param.vshmain_args = vshmain_args;
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_BenJi
Joined: 16 Jan 2008
Posts: 7
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| Posted: Sun Jan 20, 2008 7:32 pm Post subject: |
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| moonlight wrote: | This is what i dumped within vshctrl in 3.80.
| Code: |
u8 vshmain_args[0x400];
struct SceKernelLoadExecVSHParam param;
memset(vshmain_args, 0, sizeof(vshmain_args));
vshmain_args[0x40] = 1;
vshmain_args[0x280] = 1;
vshmain_args[0x284] = 3;
vshmain_args[0x286] = 5;
memset(¶m, 0, sizeof(param));
param.size = sizeof(param);
param.args = strlen(EBOOT) + 1;
param.argp = EBOOT;
param.key = "game";
param.vshmain_args_size = sizeof(vshmain_args);
param.vshmain_args = vshmain_args;
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Wow thx a lot ! That doesn't work [The game could not be started (80010002)] but I think it's because I'm running 3.71. Can you explain how did you dump this ? I'll test on a 3.80M33 |
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moonlight
Joined: 26 Oct 2005
Posts: 567
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| Posted: Sun Jan 20, 2008 8:08 pm Post subject: |
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| Well, M33 vsh core hooks some LoadExec functions to do its stuff, so i just dumped the params in the hooked function. |
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Torch
Joined: 28 May 2008
Posts: 842
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| Posted: Wed May 28, 2008 8:14 pm Post subject: |
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Can you explain the vshmain_args in a bit more detail?
I made a replacement vshmain.prx and when booting from power off, it has argc=0. If I exit recovery menu, then it has argc=19.
How do I capture the arguements in my replacement vshmain.prx and forward them to vshmain_real.prx?
You've decalred vshmain_args with 0x400 (1024) chars... Does each char correspond to one element in the *argv[] array or what?
Is vshmain_args even the same as *argv[] ?? |
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