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Re: [split] Add CFI ops, fix call/return prediction, other changes

From: Paolo Bonzini <bonzini at gnu dot org>
To: Richard Henderson <rth at redhat dot com>
Cc: Ian Lance Taylor <iant at google dot com>, gcc-patches at gcc dot gnu dot org, Ross Ridge <rridge at csclub dot uwaterloo dot ca>
Date: Wed, 30 Sep 2009 16:49:38 +0200
Subject: Re: [split] Add CFI ops, fix call/return prediction, other changes
References: <mcrab0dhqs3.fsf@dhcp-172-17-9-151.mtv.corp.google.com> <4AC36D7C.9010106@redhat.com>

movl 4(%ebp), %eax # Increment return address
inc %eax
movl %eax, -8(%ebp) # Store it in an unused slot
movl -4(%ebp), %eax # Restore 3rd register

call *-8(%ebp) # Call our caller via slot

Also, would it make sense to reserve 3 bytes for the ret, so that stdcall functions could have split stack? Alternatively, you need to disable split stack (with a sorry) for stdcall functions.

Paolo

Follow-Ups:
- Re: [split] Add CFI ops, fix call/return prediction, other changes
  - From: Ian Lance Taylor

References:
- [split] Add CFI ops, fix call/return prediction, other changes
  - From: Ian Lance Taylor
- Re: [split] Add CFI ops, fix call/return prediction, other changes
  - From: Richard Henderson

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