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----- Original Message -----
From: dwarf-discuss-request@lists.dwarfstd.org
To: dwarf-discuss at lists.dwarfstd.org
Sent: Friday, September 27, 2019 1:40:13 PM GMT-07:00
Subject: Dwarf-Discuss Digest, Vol 119, Issue 3

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>Message: 1
>Date: Fri, 27 Sep 2019 22:33:57 +0200
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>----- Original Message -----
>From: dwarf-discuss-request at lists.dwarfstd.org
>To: dwarf-discuss at lists.dwarfstd.org
>Sent: Friday, September 27, 2019 1:32:55 PM GMT-07:00
>Subject: Dwarf-Discuss Digest, Vol 119, Issue 2
>
>>Send Dwarf-Discuss mailing list submissions to
>>        dwarf-discuss at lists.dwarfstd.org
>>
>>To subscribe or unsubscribe via the World Wide Web, visit
>>        http://lists.dwarfstd.org/listinfo.cgi/dwarf-discuss-dwarfstd.org
>>or, via email, send a message with subject or body 'help' to
>>        dwarf-discuss-request at lists.dwarfstd.org
>>
>>You can reach the person managing the list at
>>        dwarf-discuss-owner at lists.dwarfstd.org
>>
>>When replying, please edit your Subject line so it is more specific
>>than "Re: Contents of Dwarf-Discuss digest..."
>>
>>
>>Today's Topics:
>>
>>   1. Re: DW_AT_segment and relocation (Michael Eager)
>>   2. Re: DW_AT_segment and relocation (Jayvee Neumann)
>>
>>
>>----------------------------------------------------------------------
>>
>>Message: 1
>>Date: Thu, 26 Sep 2019 14:11:52 -0700
>>From: Michael Eager <eager at eagerm.com>
>>To: Jayvee Neumann <jayvee.neumann at gmail.com>,
>>        dwarf-discuss at lists.dwarfstd.org
>>Subject: Re: [Dwarf-Discuss] DW_AT_segment and relocation
>>Message-ID: <0d19af28-3aa4-f199-3487-6578e339650a at eagerm.com>
>>Content-Type: text/plain; charset=utf-8; format=flowed
>>
>>On 9/26/19 3:33 AM, Jayvee Neumann via Dwarf-Discuss wrote:
>>> Dear DWARF experts,
>>>
>>> I have a question regarding the attribute DW_AT_segment. I do not quite
>>> understand how to handle it, yet.
>>> It can appear in a DIE (or its parent) whenever DW_AT_low_pc,
>>> DW_AT_high_pc, DW_AT_ranges, DW_AT_entry_pc, or a location description
>>> that evaluates to an Address are used.
>>> It can contain a location expression itself. So it can depend not only
>>> on compile-time information but also on run-time information.
>>>
>>> Assume, I have an attribute DW_AT_low_pc. If there is no DW_AT_segment,
>>> this attribute is simply the low_pc as it was determined during
>>> compile-time. While debugging, this value has to be relocated if the
>>> image had been relocated. If there is a DW_AT_segment expression is
>>> relocation still necessary? Evaluating the expression could also
>>> incorporate the usage of run-time information and relocated addresses
>>> (i.e. the DS/CS/SS registers).
>>>
>>> I hope I was able to articulate my question well, English is not my
>>> native language.
>>>
>>> Kind Regards
>>> Jayvee
>>
>>Your question is quite clear, but we don't know the context.  What
>>architecture are you working with and what ar you trying to do?
>>
>>As Ron mentioned, AT_segment is intended to support architectures like
>>the X86 where an address is composed of a [segment,offset] pair.  Most
>>architectures do not use segments.
>>
>>--
>>Michael Eager    eager at eagerm.com
>>1960 Park Blvd., Palo Alto, CA 94306
>>
>>
>>------------------------------
>>
>>Message: 2
>>Date: Fri, 27 Sep 2019 10:29:03 +0200
>>From: Jayvee Neumann <jayvee.neumann at gmail.com>
>>To: Michael Eager <eager at eagerm.com>, dwarf-discuss at lists.dwarfstd.org
>>Subject: Re: [Dwarf-Discuss] DW_AT_segment and relocation
>>Message-ID:
>>        <CALak_8ZmkjiEzA7X4+PK_Pzf+dSor5dgnnV7mG23Wk=32uMhzw at mail.gmail.com>
>>Content-Type: text/plain; charset="utf-8"
>>
>>Thank you Michael and Ron,
>>
>>what I am trying to do is write a consumer that is able to handle images
>>from several targets: i386, AMD64, and also ARM. The target images will be
>>loaded and running (and debugged during run-time).
>>I want to find a way to handle addresses in a simple way, abstracting from
>>the underlying architecture. So my first Idea was giving each address a
>>segment that can either be zero or an expression.
>>
>>That lead to the problem I mentioned in the first email. I think this is
>>best explained with an example. If the image (e.g. a DLL or a shared
>>library) has a preferred loading address of 0x1000, this address is used in
>>DWARF. But the image could be loaded at e.g. 0x2000 (or any other address).
>>The consumer has to adjust all the pc values in DWARF in that case. A
>>function whose DWARF information say is loaded from e.g. 0x10E8 to 0x1120
>>is actually loaded from 0x20E8 to 0x2120. An attribute DW_AT_low_pc with
>>the value 0x1500 would represent the address 0x2500 when the image is
>>actually loaded. But an address like Segment:Offset (e.g. CS:0x0123) would
>>be valid during run-time without any adjustment, since the segment is
>>computed from registers during run-time and thus necessarily adjusted to
>>the load-time addresses and not build-time addresses. So the rule of thumb
>>would be: Do not adjust segmented addresses in the consumer. Or have I
>>misunderstood something about this matter?
>>
>>What is kind of counter intuitive is the fact that the DWARF5 standard
>>says: if DW_AT_segment is specified at any parent DIE it is valid at its
>>subsequent child DIEs. Consumer libraries like libdwarf have no function
>>that allows for determining the parent DIE if only the child DIE is known.
>>It would be necessary to go through all DIEs and check which one is an
>>ancestor of the DIE in question. So this little sentence implies a lot of
>>difficulties for a consumer.
>>
>>Kind regards,
>>Jayvee
>>
>>Am Do., 26. Sept. 2019 um 23:12 Uhr schrieb Michael Eager <eager at eagerm.com
>>>:
>>
>>> On 9/26/19 3:33 AM, Jayvee Neumann via Dwarf-Discuss wrote:
>>> > Dear DWARF experts,
>>> >
>>> > I have a question regarding the attribute DW_AT_segment. I do not quite
>>> > understand how to handle it, yet.
>>> > It can appear in a DIE (or its parent) whenever DW_AT_low_pc,
>>> > DW_AT_high_pc, DW_AT_ranges, DW_AT_entry_pc, or a location description
>>> > that evaluates to an Address are used.
>>> > It can contain a location expression itself. So it can depend not only
>>> > on compile-time information but also on run-time information.
>>> >
>>> > Assume, I have an attribute DW_AT_low_pc. If there is no DW_AT_segment,
>>> > this attribute is simply the low_pc as it was determined during
>>> > compile-time. While debugging, this value has to be relocated if the
>>> > image had been relocated. If there is a DW_AT_segment expression is
>>> > relocation still necessary? Evaluating the expression could also
>>> > incorporate the usage of run-time information and relocated addresses
>>> > (i.e. the DS/CS/SS registers).
>>> >
>>> > I hope I was able to articulate my question well, English is not my
>>> > native language.
>>> >
>>> > Kind Regards
>>> > Jayvee
>>>
>>> Your question is quite clear, but we don't know the context.  What
>>> architecture are you working with and what ar you trying to do?
>>>
>>> As Ron mentioned, AT_segment is intended to support architectures like
>>> the X86 where an address is composed of a [segment,offset] pair.  Most
>>> architectures do not use segments.
>>>
>>> --
>>> Michael Eager    eager at eagerm.com
>>> 1960 Park Blvd., Palo Alto, CA 94306
>>>
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