I\'m working with FreeRTOS on an STM32 (Cortex-M3), and using the CMSIS library from ST to bootstrap everything.
The CMSIS library defines the weak symbol SV
SV
I'm pretty sure SVC handler is only used by FreeRTOS at initial startup, so adding an indirection exception handler isn't going to hurt performance (but its ugly). Best ask this on the FreeRTOS forum, response there is usually great.
Hope this helps, Best Regards, Dave