[llvm] d00f03d - [PPC32] Emit relocation type R_PPC_DTPREL32 for tls variables

[Aaron Ballman via llvm-commits]

Author: Varun Erigila
Date: 2023-08-09T14:28:11-04:00
New Revision: d00f03dd6fc744fd10fa1c3363c3b980a11bd51b

URL: https://github.com/llvm/llvm-project/commit/d00f03dd6fc744fd10fa1c3363c3b980a11bd51b
DIFF: https://github.com/llvm/llvm-project/commit/d00f03dd6fc744fd10fa1c3363c3b980a11bd51b.diff

LOG: [PPC32] Emit relocation type R_PPC_DTPREL32 for tls variables

This patch emits the relocation type R_PPC_DTPREL32 for tls variables,
which was previously emitting R_PPC_ADDR32 in power-pc 32bit.

Differential Revision: https://reviews.llvm.org/D156953

Added: 
    llvm/test/MC/PowerPC/ppc32-R_PPC_DTPREL32-reloc.s

Modified: 
    llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp

Removed: 
    


################################################################################
diff  --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp
index 1e58039582c250..7609ac461ea872 100644
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCELFObjectWriter.cpp
@@ -456,7 +456,13 @@ unsigned PPCELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,
       }
       break;
     case FK_Data_4:
-      Type = ELF::R_PPC_ADDR32;
+      switch (Modifier) {
+      case MCSymbolRefExpr::VK_DTPREL:
+        Type = ELF::R_PPC_DTPREL32;
+        break;
+      default:
+        Type = ELF::R_PPC_ADDR32;
+      }
       break;
     case FK_Data_2:
       Type = ELF::R_PPC_ADDR16;

diff  --git a/llvm/test/MC/PowerPC/ppc32-R_PPC_DTPREL32-reloc.s b/llvm/test/MC/PowerPC/ppc32-R_PPC_DTPREL32-reloc.s
new file mode 100644
index 00000000000000..88813b072ccc04
--- /dev/null
+++ b/llvm/test/MC/PowerPC/ppc32-R_PPC_DTPREL32-reloc.s
@@ -0,0 +1,50 @@
+# RUN: llvm-mc -filetype=obj -triple=ppc %s -o %t
+# RUN: llvm-readelf -r %t | FileCheck %s 
+
+# CHECK: Relocation section '.rela.debug_info' at offset 0xf8 contains 1 entries:
+# CHECK-NEXT: Offset     Info    Type                Sym. Value  Symbol's Name + Addend
+# CHECK-NEXT: 00000000  0000024e R_PPC_DTPREL32         00000000   tls_rtp_var + 8000
+
+	.text
+	.globl	foo                             # -- Begin function foo
+	.p2align	2
+	.type	foo, at function
+foo:                                    # @foo
+# %bb.0:                                # %entry
+	stwu 1, -16(1)
+	stw 31, 12(1)
+	mr	31, 1
+	addis 3, 2, tls_rtp_var at tprel@ha
+	addi 4, 3, tls_rtp_var at tprel@l
+	lwz 3, 0(4)
+	addi 3, 3, 1
+	stw 3, 0(4)
+	lis 4, my_global_var at ha
+	lwz 3, my_global_var at l(4)
+	addi 3, 3, 1
+	stw 3, my_global_var at l(4)
+	lwz 31, 12(1)
+	addi 1, 1, 16
+	blr
+
+	.type	tls_rtp_var, at object             # @tls_rtp_var
+	.section	.tdata,"awT", at progbits
+	.globl	tls_rtp_var
+	.p2align	2, 0x0
+tls_rtp_var:
+	.long	5                               # 0x5
+	.size	tls_rtp_var, 4
+
+	.type	my_global_var, at object           # @my_global_var
+	.data
+	.globl	my_global_var
+	.p2align	2, 0x0
+my_global_var:
+	.long	7                               # 0x7
+	.size	my_global_var, 4
+
+	.section	.debug_info,"", at progbits
+.Lcu_begin0:
+.Ldebug_info_start0:
+	.long	tls_rtp_var at DTPREL+32768
+.Ldebug_info_end0: