README.pandora
author Sam Lantinga <slouken@libsdl.org>
Thu, 16 May 2013 00:43:22 -0700
changeset 7180 3733e68edbc3
parent 6987 7084af936d82
permissions -rw-r--r--
Fixed bug 1846 - _allmul implementation in SDL_stdlib.c doesn't clean up the stack

Colin Barrett

I see this manifest itself (VS2012 x86) as:

"Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention."

in the first call to SDL_GetTicks in my application. The disassembly at the problem line is:

hires_now.QuadPart *= 1000;
00AD0792 push 0
00AD0794 push 3E8h
00AD0799 mov eax,dword ptr [ebp-10h]
00AD079C push eax
00AD079D mov ecx,dword ptr [hires_now]
00AD07A0 push ecx
00AD07A1 call _allmul (0AE7D40h)
00AD07A6 mov dword ptr [hires_now],eax
00AD07A9 mov dword ptr [ebp-10h],edx

Apparently _allmul should be popping the stack but isn't (other similar functions in SDL_stdlib.c - _alldiv and whatnot - DO pop the stack).

A 'ret 10h' at the end of _allmul appears to do the trick
     1 SDL 2.0 with open pandora console support ( http://openpandora.org/ )
     2 =====================================================================
     3 
     4 - A pandora specific video driver was written to allow SDL 2.0 with OpenGL ES
     5 support to work on the pandora under the framebuffer. This driver do not have
     6 input support for now, so if you use it you will have to add your own control code.
     7 The video driver name is "pandora" so if you have problem running it from
     8 the framebuffer, try to set the following variable before starting your application :
     9 "export SDL_VIDEODRIVER=pandora"
    10 
    11 - OpenGL ES support was added to the x11 driver, so it's working like the normal
    12 x11 driver one with OpenGLX support, with SDL input event's etc..
    13 
    14 
    15 David Carré (Cpasjuste)
    16 cpasjuste@gmail.com