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Date: Tue, 26 Sep 2006 11:40:07 -0700
From: Rod Evans <Rod.Evans@sun.com>
Reply-To: Rod.Evans@sun.com
Organization: Sun Microsystems Inc.
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To: psarc@sac.sfbay.sun.com
CC: Adam.Leventhal@sun.com, Ali Bahrami <Ali.Bahrami@sun.com>
Subject: 2006/558: R_*_SIZE relocation support.
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Status: RO
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I'm sponsoring the following case for myself.   This case qualifies for
Architectural self-review, but we wish to record the following
information.

------------------------------------------------------------------------

Dtrace requested a new relocation type, that will return the size of the
associated symbol.  See 6336605.  Developers will generate those relocations
by running a custom command which processes a tracing language.  Those
relocations will be generated by the tool itself without going through an
intermediate assembly language.  In other words, a Dtarce command will
generate a relocatable object containing these relocations, which ld(1)
must consume.  Compilers/assemblers will not be involved with this relocation
type.

Discussions with various outside ELF users have resulted in the following
new relocation definitions.

sys/elf_386.h:

   #define       R_386_SIZE32            38

sys/elf_SPARC.h:

   #define       R_SPARC_SIZE32          86
   #define       R_SPARC_SIZE64          87

sys/elf_amd64.h:

   #define       R_AMD64_SIZE32          32
   #define       R_AMD64_SIZE64          33

   #define       R_X86_64_SIZE32         R_AMD64_SIZE32
   #define       R_X86_64_SIZE64         R_AMD64_SIZE64

------------------------------------------------------------------------

The documented calculations for these are:

   NAME                VALUE   FIELD           CALCULATION

   R_386_SIZE32        38      word32          Z + A

   R_SPARC_SIZE32      86      V-word32        Z + A
   R_SPARC_SIZE64      87      V-xword64       Z + A

   R_AMD64_SIZE32      32      word32          Z + A
   R_AMD64_SIZE64      33      word64          Z + A

Where:

     Z       the size of the symbol whose index resides in the relocation
             entry

------------------------------------------------------------------------

Release Binding:               Patch/Micro
R_*_SIZE (all flavors):        Commmited


-- 

Rod.