Considering AMD K7-family (Ahtlon XP...) 32-bit only processors, have there been any published exploits (viz "Spectre" type attacks) or indications that such would be even remotely possible in practice ? While in theory, I understand, similar effects on the caches contents from (mis)speculated instructions are possible on those older processors than have been demonstrated on Itel/AMD 64, in practice I wonder whether there are the means for exploiting them on the platform under consideration. Specifically, lacking SSE2 and higher "goodies" ( clflush...), is it possible yet, using the comparatively reduced instruction set, to devise a working POC "reading" the leaked bits, at user privilege, and then, at a significant enough bit rate for such an attack to be a serious threat ? I'd appreciate to see example code if so...
Published exploits? Not that I'm aware of.