LSB-conforming applications shall use the Operating System Interfaces as defined in Chapter 3 of the System V Application Binary Interface PowerPC Processor Supplement.
Contrary to what is stated in the Registers part of Chapter 3 of the System V Application Binary Interface PowerPC Processor Supplement there are no values set in registers r3, r4, r5, r6 and r7. Instead the values specified to appear in all of those registers except r7 are placed on the stack. The value to be placed into register r7, the termination function pointer is not passed to the process.