[binutils-gdb/insn-4-byte-align] LoongArch: Enforce 4-byte align for machine instructions
liu zhensong via Binutils-cvs <[email protected]>
| Newsgroups | gmane.comp.gnu.binutils.cvs |
|---|---|
| Message-ID | <[email protected]> |
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2e5f3d9f0596e60031d7c56cf943cf00e81fe53d commit 2e5f3d9f0596e60031d7c56cf943cf00e81fe53d Author: zhaozhou <[email protected]> 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