Bus error when using dynamic_cast

[Oguz286]

Hello everyone,

I have some dynamic casts in my code which works perfectly on my pc, but when I run the same app on the PSP, it gives me a bus error. I use the casts to cast a base class into an inhereted class which makes my life easier to handle objects, but it seems the PSP doesn't like it.

Code: Select all

Texture* tex = new StaticTexture();

StaticTexture* temp = dynamic_cast<StaticTexture*>&#40;tex&#41;;

if&#40;temp&#41; &#123;
    // do stuff
&#125;

Anyone got ideas?

[jimparis]

Use psplink or psp-addr2line or something to figure out where the bus error is. Possibly an alignment issue.

[Oguz286]

I'm using psplink so that's why I know there is a bus error, but I have no idea how to figure out where exactly it's happening, but I know it's happening on the dynamic_cast line in my first post. I looked at the psp-addr2line tool but I don't know what to input into the tool.

Code: Select all

Load/Start host0:/engine.prx UID: 0x045C577B Name: "OguEngine"
host0:/> Exception - Bus error (data)
Thread ID - 0x045B8407
Th Name   - user_main
Module ID - 0x045C577B
Mod Name  - "OguEngine"
EPC       - 0x08AA6A10
Cause     - 0x1000001C
BadVAddr  - 0x740410C5
Status    - 0x20088613
zr:0x00000000 at:0x2008FF00 v0:0x00000010 v1:0x08B5FA28
a0:0x00000000 a1:0x08AF7E60 a2:0x08AF7E8C a3:0x00000000
t0:0x00000000 t1:0x00000001 t2:0x08B3C3F0 t3:0x08B986A0
t4:0x08B3C3E8 t5:0x00001E04 t6:0x08A35D70 t7:0x20088600
s0:0x08BF2440 s1:0x09FBFD04 s2:0x00000001 s3:0x000000D8
s4:0x08AF7E60 s5:0x000000FF s6:0x00000001 s7:0x09FBFCE8
t8:0x00000000 t9:0x00000000 k0:0x09FBFF00 k1:0x00000000
gp:0x08B44AB0 sp:0x09FBFC28 fp:0x09FBFEA0 ra:0x089D04C0
0x08AA6A10: 0x8C830000 '....' - lw         $v1, 0($a0)

I can't tell if it's a memory alignment issue, because I have no code that aligns variables.

I started the debugger on psplink with debug ./engine.prx but that's as far as I get.

[hlide]

Hello everyone,

I have some dynamic casts in my code which works perfectly on my pc, but when I run the same app on the PSP, it gives me a bus error. I use the casts to cast a base class into an inhereted class which makes my life easier to handle objects, but it seems the PSP doesn't like it.

Code: Select all

Texture* tex = new StaticTexture();

StaticTexture* temp = dynamic_cast<StaticTexture*>&#40;tex&#41;;

if&#40;temp&#41; &#123;
    // do stuff
&#125;

Anyone got ideas?

yes i have a strong idea : the option -nortti gives you no dynamic_cast since this one relies on RTTI

[Oguz286]

Hello everyone,

I have some dynamic casts in my code which works perfectly on my pc, but when I run the same app on the PSP, it gives me a bus error. I use the casts to cast a base class into an inhereted class which makes my life easier to handle objects, but it seems the PSP doesn't like it.

Code: Select all

Texture* tex = new StaticTexture();

StaticTexture* temp = dynamic_cast<StaticTexture*>&#40;tex&#41;;

if&#40;temp&#41; &#123;
    // do stuff
&#125;

Anyone got ideas?

yes i have a strong idea : the option -nortti gives you no dynamic_cast since this one relies on RTTI

Yes you are right, CpuWhiz just told me the same. It works now, thanks!

[TyRaNiD]

For furture reference you should be able to do in pspsh:

calc $epc-$mod
!psp-addr2line -e engine.elf $?

As long as you built with the -g switch and ensure you use the ELF not the PRX as that contains the debug info.