Vendor import of lld 6.0.1 release r335540:vendor/lld/lld-release_601-r335540vendor/lld-60

https://llvm.org/svn/llvm-project/lld/tags/RELEASE_601/final@335540

3 files changed, 8 insertions, 2 deletions

diff --git a/ELF/Arch/Mips.cpp b/ELF/Arch/Mips.cpp
index 495e2567006f..e8af36e6d11e 100644
--- a/ELF/Arch/Mips.cpp
+++ b/ELF/Arch/Mips.cpp
@@ -296,7 +296,8 @@ template <class ELFT> void MIPS<ELFT>::writePltHeader(uint8_t *Buf) const {
     write32<E>(Buf + 20, 0x0018c082); // srl   $24, $24, 2
   }
 
-  write32<E>(Buf + 24, 0x0320f809); // jalr  $25
+  uint32_t JalrInst = Config->ZHazardplt ? 0x0320fc09 : 0x0320f809;
+  write32<E>(Buf + 24, JalrInst); // jalr.hb $25 or jalr $25
   write32<E>(Buf + 28, 0x2718fffe); // subu  $24, $24, 2
 
   uint64_t GotPlt = InX::GotPlt->getVA();
@@ -330,9 +331,12 @@ void MIPS<ELFT>::writePlt(uint8_t *Buf, uint64_t GotPltEntryAddr,
     return;
   }
 
+  uint32_t JrInst = isMipsR6() ? (Config->ZHazardplt ? 0x03200409 : 0x03200009)
+                               : (Config->ZHazardplt ? 0x03200408 : 0x03200008);
+
   write32<E>(Buf, 0x3c0f0000);     // lui   $15, %hi(.got.plt entry)
   write32<E>(Buf + 4, 0x8df90000); // l[wd] $25, %lo(.got.plt entry)($15)
-  write32<E>(Buf + 8, isMipsR6() ? 0x03200009 : 0x03200008);  // jr  $25
+  write32<E>(Buf + 8, JrInst);     // jr  $25 / jr.hb $25
   write32<E>(Buf + 12, 0x25f80000); // addiu $24, $15, %lo(.got.plt entry)
   writeRelocation<E>(Buf, GotPltEntryAddr + 0x8000, 16, 16);
   writeRelocation<E>(Buf + 4, GotPltEntryAddr, 16, 0);
diff --git a/ELF/Config.h b/ELF/Config.h
index ed425720965e..1f244df4d652 100644
--- a/ELF/Config.h
+++ b/ELF/Config.h
@@ -151,6 +151,7 @@ struct Configuration {
   bool WarnMissingEntry;
   bool ZCombreloc;
   bool ZExecstack;
+  bool ZHazardplt;
   bool ZNocopyreloc;
   bool ZNodelete;
   bool ZNodlopen;
diff --git a/ELF/Driver.cpp b/ELF/Driver.cpp
index 714976ae9c4b..44cfa56c94ce 100644
--- a/ELF/Driver.cpp
+++ b/ELF/Driver.cpp
@@ -668,6 +668,7 @@ void LinkerDriver::readConfigs(opt::InputArgList &Args) {
   Config->WarnCommon = Args.hasArg(OPT_warn_common);
   Config->ZCombreloc = !hasZOption(Args, "nocombreloc");
   Config->ZExecstack = hasZOption(Args, "execstack");
+  Config->ZHazardplt = hasZOption(Args, "hazardplt");
   Config->ZNocopyreloc = hasZOption(Args, "nocopyreloc");
   Config->ZNodelete = hasZOption(Args, "nodelete");
   Config->ZNodlopen = hasZOption(Args, "nodlopen");