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Completed first draft of TLS ABI changes for PC-relative. Under review.

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master
Bill Schmidt 5 years ago
parent 4887a0b440
commit bed1094157
1 changed files with 60 additions and 342 deletions
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specification/ch_3.xml
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@ -5810,7 +5810,7 @@ extern void *__tls_get_addr (tls_index *ti);</programlisting>
</row> </row>
<row> <row>
<entry morerows="1"> <entry morerows="1">
<para>bl __tls_get_addr(x@tlsgd)</para> <para>bl __tls_get_addr@notoc(x@tlsgd)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TLSGD</para> <para>R_PPC64_TLSGD</para>
@ -6125,7 +6125,7 @@ static __thread unsigned int x3;
</row> </row>
<row> <row>
<entry morerows="1"> <entry morerows="1">
<para>bl __tls_get_addr(x1@tlsld)</para> <para>bl __tls_get_addr@notoc(x1@tlsld)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TLSLD</para> <para>R_PPC64_TLSLD</para>
@ -8319,21 +8319,10 @@ nop</programlisting>
<tbody> <tbody>
<row> <row>
<entry> <entry>
<para>addis r3, r2, x@got@tlsgd@ha</para> <para>pla r3, x@got@tlsgd@pcrel</para>
</entry>
<entry>
<para>R_PPC64_GOT_TLSGD16_HA</para>
</entry>
<entry>
<para>x</para>
</entry>
</row>
<row>
<entry>
<para>addi r3, r3, x@got@tlsgd@l</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_GOT_TLSGD16_LO</para> <para>R_PPC64_GOT_TLSGD34</para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para>x</para>
@ -8341,7 +8330,7 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry morerows="1"> <entry morerows="1">
<para>bl __tls_get_addr(x@tlsgd)</para> <para>bl __tls_get_addr@notoc(x@tlsgd)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TLSGD</para> <para>R_PPC64_TLSGD</para>
@ -8352,23 +8341,12 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>R_PPC64_REL24</para> <para>R_PPC64_REL24_NOTOC</para>
</entry> </entry>
<entry> <entry>
<para>__tls_get_addr</para> <para>__tls_get_addr</para>
</entry> </entry>
</row> </row>
<row>
<entry>
<para>nop</para>
</entry>
<entry>
<para> </para>
</entry>
<entry>
<para> </para>
</entry>
</row>
</tbody> </tbody>
</tgroup> </tgroup>
</table> </table>
@ -8457,37 +8435,15 @@ nop</programlisting>
<tbody> <tbody>
<row> <row>
<entry> <entry>
<para>addis r3, r2, x@got@tprel@ha</para> <para>pld r3, x@got@tprel@pcrel</para>
</entry>
<entry>
<para>R_PPC64_GOT_TPREL16_HA</para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para>R_PPC64_GOT_TPREL34</para>
</entry>
</row>
<row>
<entry>
<para>ld r3, x@got@tprel@l(r3)</para>
</entry>
<entry>
<para>R_PPC64_GOT_TPREL16_LO_DS</para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para>x</para>
</entry> </entry>
</row> </row>
<row>
<entry>
<para>nop</para>
</entry>
<entry>
<para> </para>
</entry>
<entry>
<para> </para>
</entry>
</row>
<row> <row>
<entry> <entry>
<para>add r3, r3, r13</para> <para>add r3, r3, r13</para>
@ -8576,21 +8532,10 @@ nop</programlisting>
<tbody> <tbody>
<row> <row>
<entry> <entry>
<para>addis r3, r2, x@got@tlsgd@ha</para> <para>pla r3, x@got@tlsgd@pcrel</para>
</entry>
<entry>
<para>R_PPC64_GOT_TLSGD16_HA</para>
</entry>
<entry>
<para>x</para>
</entry>
</row>
<row>
<entry>
<para>addi r3, r3, x@got@tlsgd@l</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_GOT_TLSGD16_LO</para> <para>R_PPC64_GOT_TLSGD34</para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para>x</para>
@ -8598,7 +8543,7 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry morerows="1"> <entry morerows="1">
<para>bl __tls_get_addr(x@tlsgd)</para> <para>bl __tls_get_addr@notoc(x@tlsgd)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TLSGD</para> <para>R_PPC64_TLSGD</para>
@ -8609,23 +8554,12 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>R_PPC64_REL24</para> <para>R_PPC64_REL24_NOTOC</para>
</entry> </entry>
<entry> <entry>
<para>__tls_get_addr</para> <para>__tls_get_addr</para>
</entry> </entry>
</row> </row>
<row>
<entry>
<para>nop</para>
</entry>
<entry>
<para> </para>
</entry>
<entry>
<para> </para>
</entry>
</row>
</tbody> </tbody>
</tgroup> </tgroup>
</table> </table>
@ -8683,18 +8617,9 @@ nop</programlisting>
</table> </table>
<para>The preceding code and global offset table entries are replaced by <para>The preceding code and global offset table entries are replaced by
the following code, which makes no reference to GOT entries. The GOT the following code, which makes no reference to GOT entries. The GOT
entries in entries in <xref linkend="dbdoclet.50655241_16273p" /> can be
<xref linkend="dbdoclet.50655241_16273" /> can be removed from the GOT by removed from the GOT by the linker when performing this code
the linker when performing this code transformation.<footnote xml:id="pgfId-1134055p"> transformation.</para>
<para>To further optimize the code in
<xref linkend="dbdoclet.50655241_16273" />, a linker may reschedule the
sequence to exploit fusion by generating a sequence that may be fused
by Power processors:</para>
<programlisting>nop
addis r3, r13, x@tprel@ha
addi r3, r3, x@tprel@l
nop</programlisting>
</footnote></para>
<table frame="all" pgwide="1"> <table frame="all" pgwide="1">
<title>General-Dynamic-to-Local-Exec Replacement Initial <title>General-Dynamic-to-Local-Exec Replacement Initial
Relocations (PC-Relative)</title> Relocations (PC-Relative)</title>
@ -8724,21 +8649,10 @@ nop</programlisting>
<tbody> <tbody>
<row> <row>
<entry> <entry>
<para>nop</para> <para>paddi r3, r13, x@tprel</para>
</entry>
<entry>
<para> </para>
</entry>
<entry>
<para> </para>
</entry>
</row>
<row>
<entry>
<para>addis r3, r13, x@tprel@ha</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TPREL16_HA</para> <para>R_PPC64_TPREL34</para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para>x</para>
@ -8755,17 +8669,6 @@ nop</programlisting>
<para> </para> <para> </para>
</entry> </entry>
</row> </row>
<row>
<entry>
<para>addi r3, r3, x@tprel@l</para>
</entry>
<entry>
<para>R_PPC64_TPREL16_LO</para>
</entry>
<entry>
<para>x</para>
</entry>
</row>
</tbody> </tbody>
</tgroup> </tgroup>
</table> </table>
@ -8804,21 +8707,10 @@ nop</programlisting>
<tbody> <tbody>
<row> <row>
<entry> <entry>
<para>addis r3, r2, x1@got@tlsld@ha</para> <para>pla r3, x1@got@tlsld@pcrel</para>
</entry>
<entry>
<para>R_PPC64_GOT_TLSLD16_HA</para>
</entry>
<entry>
<para>x1</para>
</entry>
</row>
<row>
<entry>
<para>addi r3, r3, x1@got@tlsld@l</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_GOT_TLSLD16_LO</para> <para>R_PPC64_GOT_TLSLD34</para>
</entry> </entry>
<entry> <entry>
<para>x1</para> <para>x1</para>
@ -8826,7 +8718,7 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>bl __tls_get_addr(x1@tlsld)</para> <para>bl __tls_get_addr@notoc(x1@tlsld)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TLSLD</para> <para>R_PPC64_TLSLD</para>
@ -8840,45 +8732,12 @@ nop</programlisting>
<para> </para> <para> </para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_REL24</para> <para>R_PPC64_REL24_NOTOC</para>
</entry> </entry>
<entry> <entry>
<para>__tls_get_addr</para> <para>__tls_get_addr</para>
</entry> </entry>
</row> </row>
<row>
<entry>
<para>nop</para>
</entry>
<entry>
<para> </para>
</entry>
<entry>
<para> </para>
</entry>
</row>
<row>
<entry>
<para>...</para>
</entry>
<entry>
<para> </para>
</entry>
<entry>
<para> </para>
</entry>
</row>
<row>
<entry>
<para>addi r9, r3, x1@dtprel</para>
</entry>
<entry>
<para>R_PPC64_DTPREL16</para>
</entry>
<entry>
<para>x1</para>
</entry>
</row>
<row> <row>
<entry> <entry>
<para>...</para> <para>...</para>
@ -8892,21 +8751,10 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>addis r9, r3, x2@dtprel@ha</para> <para>paddi r9, r3, x2@dtprel</para>
</entry>
<entry>
<para>R_PPC64_DTPREL16_HA</para>
</entry>
<entry>
<para>x2</para>
</entry>
</row>
<row>
<entry>
<para>addi r9, r9, x2@dtprel@l</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_DTPREL16_LO</para> <para>R_PPC64_DTPREL34</para>
</entry> </entry>
<entry> <entry>
<para>x2</para> <para>x2</para>
@ -8925,21 +8773,10 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>addis r9, r2, x3@got@dtprel@ha</para> <para>pld r9, x3@got@dtprel@pcrel</para>
</entry>
<entry>
<para>R_PPC64_GOT_DTPREL16_HA</para>
</entry>
<entry>
<para>x3</para>
</entry>
</row>
<row>
<entry>
<para>ld r9, x3@got@dtprel@l(r9)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_GOT_DTPREL16_LO_DS</para> <para>R_PPC64_GOT_DTPREL34</para>
</entry> </entry>
<entry> <entry>
<para>x3</para> <para>x3</para>
@ -9064,24 +8901,13 @@ nop</programlisting>
<tbody> <tbody>
<row> <row>
<entry> <entry>
<para>nop</para> <para>paddi r3, r13, 0x1000</para>
</entry> </entry>
<entry> <entry>
<para> </para> <para></para>
</entry> </entry>
<entry> <entry>
<para> </para> <para></para>
</entry>
</row>
<row>
<entry>
<para>addis r3, r13, L@tprel@ha</para>
</entry>
<entry>
<para>R_PPC64_TPREL16_HA</para>
</entry>
<entry>
<para>link editor generated local symbol</para>
</entry> </entry>
</row> </row>
<row> <row>
@ -9095,21 +8921,6 @@ nop</programlisting>
<para> </para> <para> </para>
</entry> </entry>
</row> </row>
<row>
<entry>
<para>addi r3, r3, L@tprel@l</para>
</entry>
<entry>
<para>R_PPC64_TPREL16_LO</para>
</entry>
<entry>
<para>link editor generated local symbol<footnote>
<para>The linker may prefer to schedule the addis and addi
to be adjacent to take advantage of fusion as a
microarchitecture optimization opportunity.</para></footnote>
</para>
</entry>
</row>
<row> <row>
<entry> <entry>
<para>..</para> <para>..</para>
@ -9123,43 +8934,10 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>addi r9, r3, x1@dtprel</para> <para>paddi r9, r3, x2@dtprel</para>
</entry>
<entry>
<para>R_PPC64_DTPREL16</para>
</entry>
<entry>
<para>x1</para>
</entry>
</row>
<row>
<entry>
<para>..</para>
</entry>
<entry>
<para> </para>
</entry>
<entry>
<para> </para>
</entry>
</row>
<row>
<entry>
<para>addis r9, r3, x2@dtprel@ha</para>
</entry>
<entry>
<para>R_PPC64_DTPREL16_HA</para>
</entry>
<entry>
<para>x2</para>
</entry>
</row>
<row>
<entry>
<para>addi r9, r9, x2@dtprel@l</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_DTPREL16_LO</para> <para>R_PPC64_DTPREL34</para>
</entry> </entry>
<entry> <entry>
<para>x2</para> <para>x2</para>
@ -9167,7 +8945,7 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>...</para> <para>..</para>
</entry> </entry>
<entry> <entry>
<para> </para> <para> </para>
@ -9178,21 +8956,10 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>addis r9, r2, x3@got@dtprel@ha</para> <para>pld r9, x3@got@dtprel@pcrel</para>
</entry>
<entry>
<para>R_PPC64_GOT_DTPREL16_HA</para>
</entry>
<entry>
<para>x3</para>
</entry>
</row>
<row>
<entry>
<para>ld r9, x3@got@dtprel@l(r9)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_GOT_DTPREL16_LO_DS</para> <para>R_PPC64_GOT_DTPREL34</para>
</entry> </entry>
<entry> <entry>
<para>x3</para> <para>x3</para>
@ -9214,7 +8981,7 @@ nop</programlisting>
</table> </table>
<para>The GOT[n] and GOT[n+1] entries can be removed by the linker after <para>The GOT[n] and GOT[n+1] entries can be removed by the linker after
the code transformation as shown in the code transformation as shown in
<xref linkend="dbdoclet.50655241_90771" />.</para> <xref linkend="dbdoclet.50655241_90771p" />.</para>
<table frame="all" pgwide="1" xml:id="dbdoclet.50655241_90771p"> <table frame="all" pgwide="1" xml:id="dbdoclet.50655241_90771p">
<title>Local-Dynamic-to-Local-Exec Replacement GOT Entry <title>Local-Dynamic-to-Local-Exec Replacement GOT Entry
Relocations (PC-Relative)</title> Relocations (PC-Relative)</title>
@ -9256,14 +9023,9 @@ nop</programlisting>
</tbody> </tbody>
</tgroup> </tgroup>
</table> </table>
<para>The local symbol generated by the link editor points to the start
of the thread storage block plus 0x7000 bytes. In practice, a section
symbol with a suitable offset will be used.</para>
</section> </section>
<section xml:id="dbdoclet.ie-le-pcrel" revisionflag="added"> <section xml:id="dbdoclet.ie-le-pcrel" revisionflag="added">
<title>Initial Exec to Local Exec (PC-Relative)</title> <title>Initial Exec to Local Exec (PC-Relative)</title>
<para>This transformation is only performed by the linker when the symbol
is within 2 GB + 28 KB of the thread pointer.</para>
<table frame="all" pgwide="1"> <table frame="all" pgwide="1">
<title>Initial-Exec-to-Local-Exec Initial Relocations</title> <title>Initial-Exec-to-Local-Exec Initial Relocations</title>
<tgroup cols="3"> <tgroup cols="3">
@ -9292,21 +9054,10 @@ nop</programlisting>
<tbody> <tbody>
<row> <row>
<entry> <entry>
<para>addis r9, r2, x@got@tprel@ha</para> <para>pld r9, x@got@tprel@pcrel</para>
</entry>
<entry>
<para>R_PPC64_GOT_TPREL16_HA</para>
</entry>
<entry>
<para>x</para>
</entry>
</row>
<row>
<entry>
<para>ld r9, x@got@tprel@l(r9)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_GOT_TPREL16_LO_DS</para> <para>R_PPC64_GOT_TPREL34</para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para>x</para>
@ -9314,10 +9065,10 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>add r9, r9, x@tls</para> <para>add r9, r9, x@tls@pcrel</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TLS</para> <para>R_PPC64_TLS with one-byte displacement</para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para>x</para>
@ -9368,7 +9119,8 @@ nop</programlisting>
</tgroup> </tgroup>
</table> </table>
<para>The preceding code and global offset table entries are replaced by <para>The preceding code and global offset table entries are replaced by
the following code and global offset table entries.</para> the following code. The global offset entry GOT[n] can be
eliminated by the linker.</para>
<table frame="all" pgwide="1"> <table frame="all" pgwide="1">
<title>Initial-Exec-to-Local-Exec Replacement Initial <title>Initial-Exec-to-Local-Exec Replacement Initial
Relocations (PC-Relative)</title> Relocations (PC-Relative)</title>
@ -9390,21 +9142,10 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>nop</para> <para>paddi r9, r9, x@tprel@l</para>
</entry>
<entry>
<para> </para>
</entry> </entry>
<entry> <entry>
<para> </para> <para>R_PPC64_TPREL34</para>
</entry>
</row>
<row>
<entry>
<para>addis r9, r13, x@tprel@ha</para>
</entry>
<entry>
<para>R_PPC64_TPREL16_HA</para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para>x</para>
@ -9412,22 +9153,20 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>addi r9, r9, x@tprel@l</para> <para>nop</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TPREL16_LO</para> <para> </para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para> </para>
</entry> </entry>
</row> </row>
</tbody> </tbody>
</tgroup> </tgroup>
</table> </table>
<para>Other sizes and types of thread-local variables may use any of the
X-form indexed load or store instructions.</para>
<para> <para>
<xref linkend="dbdoclet.50655241_81882" /> shows how to access the <xref linkend="dbdoclet.50655241_81882p" /> shows how to access the
contents of a variable using the X-form indexed load and store contents of a variable using the X-form indexed load and store
instructions.</para> instructions.</para>
<table frame="all" pgwide="1" xml:id="dbdoclet.50655241_81882p"> <table frame="all" pgwide="1" xml:id="dbdoclet.50655241_81882p">
@ -9459,21 +9198,10 @@ nop</programlisting>
<tbody> <tbody>
<row> <row>
<entry> <entry>
<para>addis r9, r2, x@got@tprel@ha</para> <para>pld r9, x@got@tprel@pcrel</para>
</entry>
<entry>
<para>R_PPC64_GOT_TPREL16_HA</para>
</entry>
<entry>
<para>x</para>
</entry>
</row>
<row>
<entry>
<para>ld r9, x@got@tprel@l(r9)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_GOT_TPREL16_LO_DS</para> <para>R_PPC64_GOT_TPREL34</para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para>x</para>
@ -9481,7 +9209,7 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>lbzx r10, r9, x@tls</para> <para>lbzx r10, r9, x@tls@pcrel</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TLS</para> <para>R_PPC64_TLS</para>
@ -9503,7 +9231,7 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>stbx r10, r9, x@tls</para> <para>stbx r10, r9, x@tls@pcrel</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TLS</para> <para>R_PPC64_TLS</para>
@ -9557,7 +9285,8 @@ nop</programlisting>
</tgroup> </tgroup>
</table> </table>
<para>The preceding code and global offset table entries are replaced by <para>The preceding code and global offset table entries are replaced by
the following code and global offset table entries.</para> the following code. The global offset table entry GOT[n] can be
removed by the linker.</para>
<table frame="all" pgwide="1"> <table frame="all" pgwide="1">
<title>Initial-Exec-to-Local-Exec X-form Replacement Initial <title>Initial-Exec-to-Local-Exec X-form Replacement Initial
Relocations (PC-Relative)</title> Relocations (PC-Relative)</title>
@ -9587,21 +9316,10 @@ nop</programlisting>
<tbody> <tbody>
<row> <row>
<entry> <entry>
<para>nop</para> <para>paddi r9, r13, x@tprel</para>
</entry>
<entry>
<para> </para>
</entry>
<entry>
<para> </para>
</entry> </entry>
</row>
<row>
<entry> <entry>
<para>addis r9, r13, x@tprel@ha</para> <para>R_PPC64_TPREL34</para>
</entry>
<entry>
<para>R_PPC64_TPREL16_HA</para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para>x</para>
@ -9609,13 +9327,13 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>lbz r10, x@tprel@l(r9)</para> <para>lbz r10, 0(r9)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TPREL16_LO</para> <para></para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para></para>
</entry> </entry>
</row> </row>
<row> <row>
@ -9631,13 +9349,13 @@ nop</programlisting>
</row> </row>
<row> <row>
<entry> <entry>
<para>stb r10, x@tprel@l(r9)</para> <para>stb r10, 0(r9)</para>
</entry> </entry>
<entry> <entry>
<para>R_PPC64_TPREL16_LO</para> <para></para>
</entry> </entry>
<entry> <entry>
<para>x</para> <para></para>
</entry> </entry>
</row> </row>
</tbody> </tbody>

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