[binutils-gdb/insn-4-byte-align] LoongArch: Enforce 4-byte align for machine instructions

[liu zhensong]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2e5f3d9f0596e60031d7c56cf943cf00e81fe53d

commit 2e5f3d9f0596e60031d7c56cf943cf00e81fe53d
Author: zhaozhou <zhaozhou@loongson.cn>
Date:   Thu Apr 16 17:31:41 2026 +0800

    LoongArch: Enforce 4-byte align for machine instructions
    
    If no alignment is specified in the assembly file, LoongArch will not
    perform forced alignment. When this object file (.o) is linked into an
    executable, instructions may not be 4-byte aligned, which will
    eventually cause instruction fetch errors.
    
    For example, the above issue can occur when generating a shared object
    file (.so) with the -nostdlib option.

Diff:
---
 gas/config/tc-loongarch.c                  | 5 +++++
 gas/testsuite/gas/loongarch/insn_align_4.d | 7 +++++++
 gas/testsuite/gas/loongarch/insn_align_4.s | 4 ++++
 3 files changed, 16 insertions(+)

diff --git a/gas/config/tc-loongarch.c b/gas/config/tc-loongarch.c
index 1eb35f2c75e..d067318ce24 100644
--- a/gas/config/tc-loongarch.c
+++ b/gas/config/tc-loongarch.c
@@ -1432,6 +1432,11 @@ loongarch_assemble_INSNs (char *str, unsigned int expand_from_macro)
       if (*str == '\0')
 	break;
 
+      /* LoongArch instructions require 4-byte alignment.  When emitting
+	 instructions into any section, record the appropriate section
+	 alignment.  */
+      record_alignment (now_seg, 2);
+
       struct loongarch_cl_insn the_one;
       memset (&the_one, 0, sizeof (the_one));
       the_one.name = str;
diff --git a/gas/testsuite/gas/loongarch/insn_align_4.d b/gas/testsuite/gas/loongarch/insn_align_4.d
new file mode 100644
index 00000000000..31a5d352a76
--- /dev/null
+++ b/gas/testsuite/gas/loongarch/insn_align_4.d
@@ -0,0 +1,7 @@
+#as:
+#readelf: -S
+
+#...
+  \[ [0-9]+\] \.text             PROGBITS         [0-9a-f]{16}  [0-9a-f]{8}
+       [0-9a-f]{16}  [0-9a-f]{16}  AX       0     0     4
+#...
diff --git a/gas/testsuite/gas/loongarch/insn_align_4.s b/gas/testsuite/gas/loongarch/insn_align_4.s
new file mode 100644
index 00000000000..7b4922c113f
--- /dev/null
+++ b/gas/testsuite/gas/loongarch/insn_align_4.s
@@ -0,0 +1,4 @@
+.type test, @function
+test:
+  jirl	$ra, $ra, 0
+.size test, .-test