LoongArch: Handle fp, lsx, lasx and lbt assembly symbols

Like the other relevant symbols, export them and put the function
declarations in header files rather than source files.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Binbin Zhou <zhoubinbin@loongson.cn>

Author: AaronDot

arch/loongarch/include/asm/fpu.h

@@ -27,16 +27,22 @@ extern void kernel_fpu_end(void);
 extern void _init_fpu(unsigned int);
 extern void _save_fp(struct loongarch_fpu *);
 extern void _restore_fp(struct loongarch_fpu *);
+extern int _save_fp_context(void __user *fpregs, void __user *fcc, void __user *csr);
+extern int _restore_fp_context(void __user *fpregs, void __user *fcc, void __user *csr);
 
 extern void _save_lsx(struct loongarch_fpu *fpu);
 extern void _restore_lsx(struct loongarch_fpu *fpu);
 extern void _init_lsx_upper(void);
 extern void _restore_lsx_upper(struct loongarch_fpu *fpu);
+extern int _save_lsx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
+extern int _restore_lsx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
 
 extern void _save_lasx(struct loongarch_fpu *fpu);
 extern void _restore_lasx(struct loongarch_fpu *fpu);
 extern void _init_lasx_upper(void);
 extern void _restore_lasx_upper(struct loongarch_fpu *fpu);
+extern int _save_lasx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
+extern int _restore_lasx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
 
 static inline void enable_lsx(void);
 static inline void disable_lsx(void);

arch/loongarch/include/asm/lbt.h

@@ -15,6 +15,10 @@
 extern void _init_lbt(void);
 extern void _save_lbt(struct loongarch_lbt *);
 extern void _restore_lbt(struct loongarch_lbt *);
+extern int _save_lbt_context(void __user *regs, void __user *eflags);
+extern int _restore_lbt_context(void __user *regs, void __user *eflags);
+extern int _save_ftop_context(void __user *ftop);
+extern int _restore_ftop_context(void __user *ftop);
 
 static inline int is_lbt_enabled(void)
 {

arch/loongarch/kernel/fpu.S

@@ -458,6 +458,7 @@ SYM_FUNC_START(_save_fp_context)
 	li.w		a0, 0				# success
 	jr		ra
 SYM_FUNC_END(_save_fp_context)
+EXPORT_SYMBOL_GPL(_save_fp_context)
 
 /*
  * a0: fpregs
@@ -471,6 +472,7 @@ SYM_FUNC_START(_restore_fp_context)
 	li.w		a0, 0				# success
 	jr		ra
 SYM_FUNC_END(_restore_fp_context)
+EXPORT_SYMBOL_GPL(_restore_fp_context)
 
 /*
  * a0: fpregs
@@ -484,6 +486,7 @@ SYM_FUNC_START(_save_lsx_context)
 	li.w	a0, 0					# success
 	jr	ra
 SYM_FUNC_END(_save_lsx_context)
+EXPORT_SYMBOL_GPL(_save_lsx_context)
 
 /*
  * a0: fpregs
@@ -497,6 +500,7 @@ SYM_FUNC_START(_restore_lsx_context)
 	li.w	a0, 0					# success
 	jr	ra
 SYM_FUNC_END(_restore_lsx_context)
+EXPORT_SYMBOL_GPL(_restore_lsx_context)
 
 /*
  * a0: fpregs
@@ -510,6 +514,7 @@ SYM_FUNC_START(_save_lasx_context)
 	li.w	a0, 0					# success
 	jr	ra
 SYM_FUNC_END(_save_lasx_context)
+EXPORT_SYMBOL_GPL(_save_lasx_context)
 
 /*
  * a0: fpregs
@@ -523,6 +528,7 @@ SYM_FUNC_START(_restore_lasx_context)
 	li.w	a0, 0					# success
 	jr	ra
 SYM_FUNC_END(_restore_lasx_context)
+EXPORT_SYMBOL_GPL(_restore_lasx_context)
 
 .L_fpu_fault:
 	li.w	a0, -EFAULT				# failure

arch/loongarch/kernel/lbt.S

@@ -90,6 +90,7 @@ SYM_FUNC_START(_save_lbt_context)
 	li.w		a0, 0			# success
 	jr		ra
 SYM_FUNC_END(_save_lbt_context)
+EXPORT_SYMBOL_GPL(_save_lbt_context)
 
 /*
  * a0: scr
@@ -110,6 +111,7 @@ SYM_FUNC_START(_restore_lbt_context)
 	li.w		a0, 0			# success
 	jr		ra
 SYM_FUNC_END(_restore_lbt_context)
+EXPORT_SYMBOL_GPL(_restore_lbt_context)
 
 /*
  * a0: ftop
@@ -120,6 +122,7 @@ SYM_FUNC_START(_save_ftop_context)
 	li.w		a0, 0			# success
 	jr		ra
 SYM_FUNC_END(_save_ftop_context)
+EXPORT_SYMBOL_GPL(_save_ftop_context)
 
 /*
  * a0: ftop
@@ -150,6 +153,7 @@ SYM_FUNC_START(_restore_ftop_context)
 	li.w		a0, 0			# success
 	jr		ra
 SYM_FUNC_END(_restore_ftop_context)
+EXPORT_SYMBOL_GPL(_restore_ftop_context)
 
 .L_lbt_fault:
 	li.w		a0, -EFAULT		# failure

arch/loongarch/kernel/signal.c

@@ -50,27 +50,6 @@
 #define lock_lbt_owner()	({ preempt_disable(); pagefault_disable(); })
 #define unlock_lbt_owner()	({ pagefault_enable(); preempt_enable(); })
 
-/* Assembly functions to move context to/from the FPU */
-extern asmlinkage int
-_save_fp_context(void __user *fpregs, void __user *fcc, void __user *csr);
-extern asmlinkage int
-_restore_fp_context(void __user *fpregs, void __user *fcc, void __user *csr);
-extern asmlinkage int
-_save_lsx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
-extern asmlinkage int
-_restore_lsx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
-extern asmlinkage int
-_save_lasx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
-extern asmlinkage int
-_restore_lasx_context(void __user *fpregs, void __user *fcc, void __user *fcsr);
-
-#ifdef CONFIG_CPU_HAS_LBT
-extern asmlinkage int _save_lbt_context(void __user *regs, void __user *eflags);
-extern asmlinkage int _restore_lbt_context(void __user *regs, void __user *eflags);
-extern asmlinkage int _save_ftop_context(void __user *ftop);
-extern asmlinkage int _restore_ftop_context(void __user *ftop);
-#endif
-
 struct rt_sigframe {
 	struct siginfo rs_info;
 	struct ucontext rs_uctx;