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Re: [PATCH] [RFC] PR target/52813 and target/11807
On Mon, Dec 17 2018 20:15:02 EET Bernd Edlinger wrote:
> out of curiosity I looked at the clobber statement in
> asm volatile ("pushq %0;"
> ".globl linux_ptrace_test_ret_to_nx_instr;"
> : : "r" ((uint64_t) (uintptr_t) return_address)
> : "%rsp", "memory");
> it turns out to be a far jump, instruction.
GDB functionality should not be affected if SP clobber is removed, even if the
generated code is slightly different. Please see this comment:
As I understand it, this particular code is never meant to return. It should
either stop due to the NX mapping of return_address/%0, or hit the breakpoint
placed at return_address/%0.