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authorTiezhu Yang <yangtiezhu@loongson.cn>2023-09-06 17:53:10 +0300
committerHuacai Chen <chenhuacai@loongson.cn>2023-09-06 17:53:10 +0300
commit8f58c571bf3095278ebda49ce95df5ead27ebb42 (patch)
tree34421e9ed2c4c444ef3122f9501c72db2b3977bc /arch/loongarch
parent937f65935950a0346292120acc5d98033f90e61c (diff)
downloadlinux-8f58c571bf3095278ebda49ce95df5ead27ebb42.tar.xz
LoongArch: Define 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_START()/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_fpu_fault Co-developed-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Youling Tang <tangyouling@loongson.cn> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch')
-rw-r--r--arch/loongarch/kernel/fpu.S5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/loongarch/kernel/fpu.S b/arch/loongarch/kernel/fpu.S
index 501094a09f5d..80dccf8e39a7 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_fpu_fault
.endm
.macro sc_save_fp base
@@ -514,7 +514,6 @@ SYM_FUNC_START(_restore_lasx_context)
jr ra
SYM_FUNC_END(_restore_lasx_context)
-SYM_FUNC_START(fault)
+.L_fpu_fault:
li.w a0, -EFAULT # failure
jr ra
-SYM_FUNC_END(fault)