linux-kernel - [PATCH] LoongArch: Define the symbol fault as a local label in fpu.S

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Date:   Wed, 30 Aug 2023 10:47:07 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>
Cc:     loongarch@...ts.linux.dev, linux-kernel@...r.kernel.org,
        loongson-kernel@...ts.loongnix.cn
Subject: [PATCH] LoongArch: Define the symbol fault as a local label in fpu.S

The initial aim is to silence the following objtool warnings:

  arch/loongarch/kernel/fpu.o: warning: objtool: _save_fp_context() falls through to next function fault()
  arch/loongarch/kernel/fpu.o: warning: objtool: _restore_fp_context() falls through to next function fault()
  arch/loongarch/kernel/fpu.o: warning: objtool: _save_lsx_context() falls through to next function fault()
  arch/loongarch/kernel/fpu.o: warning: objtool: _restore_lsx_context() falls through to next function fault()
  arch/loongarch/kernel/fpu.o: warning: objtool: _save_lasx_context() falls through to next function fault()
  arch/loongarch/kernel/fpu.o: warning: objtool: _restore_lasx_context() falls through to next function fault()

Currently, SYM_FUNC_END() defines the symbol fault as SYM_T_FUNC which
is STT_FUNC, the objtool warnings are generated through the following
code:

tools/objtool/include/objtool/check.h
static inline struct symbol *insn_func(struct instruction *insn)
{
	struct symbol *sym = insn->sym;

	if (sym && sym->type != STT_FUNC)
		sym = NULL;

	return sym;
}

tools/objtool/check.c
static int validate_branch(struct objtool_file *file, struct symbol *func,
			   struct instruction *insn, struct insn_state state)
{
...
		if (func && insn_func(insn) && func != insn_func(insn)->pfunc) {
...
			WARN("%s() falls through to next function %s()",
			     func->name, insn_func(insn)->name);
			return 1;
		}
...
}

We can see that the fixup can be a local label in the following code:

arch/loongarch/include/asm/asm-extable.h
	.pushsection	__ex_table, "a";		\
	.balign		4;				\
	.long		((insn) - .);			\
	.long		((fixup) - .);			\
	.short		(type);				\
	.short		(data);				\
	.popsection;

	.macro		_asm_extable, insn, fixup
	__ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0)
	.endm

Like arch/loongarch/lib/*.S, just define the symbol fault as a local
label in fpu.S.

Before:

$ readelf -s arch/loongarch/kernel/fpu.o | awk -F: /fault/'{print $2}'
 000000000000053c     8 FUNC    GLOBAL DEFAULT    1 fault

After:

$ readelf -s arch/loongarch/kernel/fpu.o | awk -F: /fault/'{print $2}'
 000000000000053c     0 NOTYPE  LOCAL  DEFAULT    1 .L_fixup_fpu_fault

Co-developed-by: Youling Tang <tangyouling@...ngson.cn>
Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---

There is a same issue in lbt.S, Huacai suggested to squash the changes
in the original patch:
"LoongArch: Add Loongson Binary Translation (LBT) extension support"

 arch/loongarch/kernel/fpu.S | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/loongarch/kernel/fpu.S b/arch/loongarch/kernel/fpu.S
index b4032de..3177725 100644
--- a/arch/loongarch/kernel/fpu.S
+++ b/arch/loongarch/kernel/fpu.S
@@ -22,7 +22,7 @@
 
 	.macro	EX insn, reg, src, offs
 .ex\@:	\insn	\reg, \src, \offs
-	_asm_extable .ex\@, fault
+	_asm_extable .ex\@, .L_fixup_fpu_fault
 	.endm
 
 	.macro sc_save_fp base
@@ -521,7 +521,6 @@ SYM_FUNC_START(_restore_lasx_context)
 	jr	ra
 SYM_FUNC_END(_restore_lasx_context)
 
-SYM_FUNC_START(fault)
+.L_fixup_fpu_fault:
 	li.w	a0, -EFAULT				# failure
 	jr	ra
-SYM_FUNC_END(fault)
-- 
2.1.0