[binutils-gdb] aarch64: Fix %dtprel relocations size.

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=46709f190eb7ddf3888226feec6c1e13984cfcc9

commit 46709f190eb7ddf3888226feec6c1e13984cfcc9
Author: Srinath Parvathaneni <[email protected]>
Date:   Wed Jul 8 21:12:27 2026 +0000

    aarch64: Fix %dtprel relocations size.
    
    The AArch64 ELF ABI [1] requires DTPREL relocations to be
    8 bytes wide, so added a check to reject %dtprel when used
    with anything other than .xword.
    
    [1] https://github.com/ARM-software/abi-aa/blob/main/aaelf64/aaelf64.rst#5715dynamic-relocations

Diff:
---
 gas/config/tc-aarch64.c                   | 7 +++++++
 gas/testsuite/gas/aarch64/tls-debug-bad.d | 4 ++++
 gas/testsuite/gas/aarch64/tls-debug-bad.l | 2 ++
 gas/testsuite/gas/aarch64/tls-debug-bad.s | 7 +++++++
 4 files changed, 20 insertions(+)

diff --git a/gas/config/tc-aarch64.c b/gas/config/tc-aarch64.c
index 2da5139d8af..6d412651354 100644
--- a/gas/config/tc-aarch64.c
+++ b/gas/config/tc-aarch64.c
@@ -2234,6 +2234,13 @@ s_aarch64_cons (int nbytes)
 
 	      expression (&exp);
 
+	      if (nbytes != 8)
+		{
+		  as_bad (_("%%dtprel relocation requires .xword or .dword"));
+		  ignore_rest_of_line ();
+		  return;
+		}
+
 	      /* Ensure we have a closing parenthesis */
 	      if (*input_line_pointer == ')')
 		input_line_pointer++;
diff --git a/gas/testsuite/gas/aarch64/tls-debug-bad.d b/gas/testsuite/gas/aarch64/tls-debug-bad.d
new file mode 100644
index 00000000000..fb1af537d95
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/tls-debug-bad.d
@@ -0,0 +1,4 @@
+#as:
+#objdump: -r
+#target: aarch64*-*-*
+#error_output: tls-debug-bad.l
diff --git a/gas/testsuite/gas/aarch64/tls-debug-bad.l b/gas/testsuite/gas/aarch64/tls-debug-bad.l
new file mode 100644
index 00000000000..68e69ea0cdc
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/tls-debug-bad.l
@@ -0,0 +1,2 @@
+[^ :]+: Assembler messages:
+[^ :]+:[0-9]+: Error: %dtprel relocation requires \.xword or \.dword
diff --git a/gas/testsuite/gas/aarch64/tls-debug-bad.s b/gas/testsuite/gas/aarch64/tls-debug-bad.s
new file mode 100644
index 00000000000..c4987bc3260
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/tls-debug-bad.s
@@ -0,0 +1,7 @@
+.section .tdata,"awT",@progbits
+.globl var
+var:
+  .word 0
+
+.section        .debug_info,"",@progbits
+  .word  %dtprel(var)