On 10/14/2015 12:05 PM, Richard Henderson wrote:
If you're using one of the switches that checks for stack overflow at the start of the function, you certainly don't want to do any such stores.
Oh, and for a given target the kernel may consider any write to the stack vma below the stack pointer as invalid.
The x86 kernels will at least handle "enter $65535, $31", which can write to a bit more than 64k below %esp before %esp gets updated, but that's probably not going to be true of most risc targets.
r~
