[lld] r342411 - [PPC64] Support relaxing R_PPC64_TLSGD16 in TlsGdtoLe relaxation.
Sean Fertile via llvm-commits
llvm-commits at lists.llvm.org
Mon Sep 17 13:27:02 PDT 2018
Author: sfertile
Date: Mon Sep 17 13:27:02 2018
New Revision: 342411
URL: http://llvm.org/viewvc/llvm-project?rev=342411&view=rev
Log:
[PPC64] Support relaxing R_PPC64_TLSGD16 in TlsGdtoLe relaxation.
A General-dynamic tls access can be written using a R_PPC64_TLSGD16 relocation
if the target got entry is within 16 bits of the TOC-base. This patch adds
support for R_PPC64_TLSGD16 by relaxing it the same as a R_PPC64_GOT_TLSGD16_LO.
Differential Revision: https://reviews.llvm.org/D52055
Added:
lld/trunk/test/ELF/ppc64-tls-gd-le-small.s
Modified:
lld/trunk/ELF/Arch/PPC64.cpp
Modified: lld/trunk/ELF/Arch/PPC64.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Arch/PPC64.cpp?rev=342411&r1=342410&r2=342411&view=diff
==============================================================================
--- lld/trunk/ELF/Arch/PPC64.cpp (original)
+++ lld/trunk/ELF/Arch/PPC64.cpp Mon Sep 17 13:27:02 2018
@@ -208,6 +208,7 @@ void PPC64::relaxTlsGdToLe(uint8_t *Loc,
case R_PPC64_GOT_TLSGD16_HA:
writeInstrFromHalf16(Loc, 0x60000000); // nop
break;
+ case R_PPC64_GOT_TLSGD16:
case R_PPC64_GOT_TLSGD16_LO:
writeInstrFromHalf16(Loc, 0x3c6d0000); // addis r3, r13
relocateOne(Loc, R_PPC64_TPREL16_HA, Val);
Added: lld/trunk/test/ELF/ppc64-tls-gd-le-small.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/ppc64-tls-gd-le-small.s?rev=342411&view=auto
==============================================================================
--- lld/trunk/test/ELF/ppc64-tls-gd-le-small.s (added)
+++ lld/trunk/test/ELF/ppc64-tls-gd-le-small.s Mon Sep 17 13:27:02 2018
@@ -0,0 +1,61 @@
+# REQUIRES: ppc
+
+# RUN: llvm-mc -filetype=obj -triple=powerpc64le-unknown-linux %s -o %t.o
+# RUN: llvm-objdump -d -r %t.o | FileCheck --check-prefix=CHECK-INPUT %s
+# RUN: ld.lld --defsym __tls_get_addr=0x1001000 %t.o -o %t
+# RUN: llvm-objdump -d %t | FileCheck --check-prefix=CHECK-DIS %s
+# RUN: llvm-readelf -relocations %t | FileCheck --check-prefix=DYN-RELOCS %s
+
+# RUN: llvm-mc -filetype=obj -triple=powerpc64-unknown-linux %s -o %t.o
+# RUN: llvm-objdump -d -r %t.o | FileCheck --check-prefix=CHECK-INPUT %s
+# RUN: ld.lld --defsym __tls_get_addr=0x1001000 %t.o -o %t
+# RUN: llvm-objdump -d %t | FileCheck --check-prefix=CHECK-DIS %s
+# RUN: llvm-readelf -relocations %t | FileCheck --check-prefix=DYN-RELOCS %s
+
+# Test checks the relaxation of a 'small' general-dynamic tls access into a
+# local-exec tls access.
+
+ .text
+ .abiversion 2
+
+ .global test
+ .p2align 4
+ .type test, @function
+
+test:
+.Lgep:
+ addis 2, 12, .TOC.-.Lgep at ha
+ addi 2, 2, .TOC.-.Lgep at l
+ .localentry test, .-test
+ mflr 0
+ std 0, 16(1)
+ stdu 1, -32(1)
+ addi 3, 2, a at got@tlsgd
+ bl __tls_get_addr(a at tlsgd)
+ nop
+ lwz 3, 0(3)
+ addi 1, 1, 32
+ ld 0, 16(1)
+ mtlr 0
+ blr
+
+ .type a, @object
+ .section .tdata,"awT", at progbits
+ .global a
+ .p2align 2
+a:
+ .long 55
+ .size a, 4
+
+# CHECK-INPUT: addi 3, 2, 0
+# CHECK-INPUT-NEXT: R_PPC64_GOT_TLSGD16 a
+# CHECK-INPUT-NEXT: bl .+0
+# CHECK-INPUT-NEXT: R_PPC64_TLSGD a
+# CHECK-INPUT-NEXT: R_PPC64_REL24 __tls_get_addr
+
+# CHECK-DIS: addis 3, 13, 0
+# CHECK-DIS-NEXT: nop
+# CHECK-DIS-NEXT: addi 3, 3, -28672
+# CHECK-DIS-NEXT: lwz 3, 0(3)
+
+# DYN-RELOCS: There are no relocations in this file
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