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Re: [PTX] crt0

From: Nathan Sidwell <nathan at acm dot org>
To: Alexander Monakov <amonakov at ispras dot ru>
Cc: GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Wed, 25 May 2016 09:56:54 -0400
Subject: Re: [PTX] crt0
Authentication-results: sourceware.org; auth=none
References: <1adcf079-7ac8-544d-d896-d6d246e689e1 at acm dot org> <alpine dot LNX dot 2 dot 20 dot 1605251612120 dot 25541 at monopod dot intra dot ispras dot ru>

On 05/25/16 09:28, Alexander Monakov wrote:

On Wed, 25 May 2016, Nathan Sidwell wrote:

This  patch reimplements crt0  as C rather than assembly.  That means it;ll be
good with 32 bit addresses.  I've also completely moved abort and exit into
newlib (a fork on github), which had it's own copies that failed to set the
exit code.  Things happened to work because they were never found, being
hidden by the ones provided in crt0.s.  You'll need to update your newlib
sources for exit codes to continue to work.


Doesn't this break offloading compilation?


It won't -- but you're right about .weak not being undefined-is-zero.

Or is that something nvptx-run should check for and initialize?


The interface between nvptx-run and crt0 would need to change to allow that.

That is exactly what I'm suggesting. nvptx-run looks for a __soft_stack symboland goes poking at it before launch.


nathan

Follow-Ups:
- Re: [PTX] crt0
  - From: Alexander Monakov

References:
- [PTX] crt0
  - From: Nathan Sidwell
- Re: [PTX] crt0
  - From: Alexander Monakov

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