From: John Carr <jfc@MIT.EDU>
To: Normand <normand@linux.vnet.ibm.com>
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Where is defined the caml_program initial entry point called from asmrun/*/
Date: Fri, 28 Mar 2014 07:59:18 -0400 [thread overview]
Message-ID: <201403281159.s2SBxI0E022524@outgoing.mit.edu> (raw)
In-Reply-To: <5335584E.5080908@linux.vnet.ibm.com>
The result of an ocaml program is the side effect of loading
(initializing) all modules. Cmmgen.entry_point generates a function
called caml_program that runs the module initializer functions of
everything you link. If you need to see the exact assembly code
you can use -S to save the assembly file with this generated function.
It may be in /tmp.
Make sure you understand asmrun/stack.h, which defines part of the
binary interface between compiler and runtime and between runtime
C and assembly code. If the definitions don't match your program may
crash when it throws an exception or garbage collects.
>
> I still have problems while porting ocaml on ppc64le archi. I was able to generate the ocamlcompopt, but obviously with missing changes because the first trial is segfault.
>
> Investigating the failure with gdb I was able to trace the code from "caml_start_program" calling "caml_program"
> https://git.fedorahosted.org/cgit/fedora-ocaml.git/tree/asmrun/power64-elf.S#n350
> (url without my own patches)
>
> But I am not able to find the source code associated to the "caml_program"
>
> Could somebody give me a clue ? I guess this is generated with help of asmcomp/*/emit.mlp
> and may be the asmcomp/cmmgen.ml but the generated asmcom/cmmgen.s do not match the disassemble code displayed via gdb.
>
>
> --
> Michel Normand
>
>
> --
> Caml-list mailing list. Subscription management and archives:
> https://sympa.inria.fr/sympa/arc/caml-list
> Beginner's list: http://groups.yahoo.com/group/ocaml_beginners
> Bug reports: http://caml.inria.fr/bin/caml-bugs
prev parent reply other threads:[~2014-03-28 11:59 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-20 15:53 [Caml-list] need help to investigate an ocaml build error on ppc64le archi Normand
2014-03-20 18:36 ` Normand
2014-03-22 12:20 ` Richard W.M. Jones
2014-03-22 12:24 ` Richard W.M. Jones
2014-03-28 11:09 ` [Caml-list] Where is defined the caml_program initial entry point called from asmrun/*/ Normand
2014-03-28 11:59 ` John Carr [this message]
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