arm64: Add prototypes for functions called by entry.S

Functions that are only called by assembly don't always have a
C header file prototype.

Add the prototypes before moving the assembly callers to C.
Signed-off-by: NJames Morse <james.morse@arm.com>
Acked-by: NMark Rutland <mark.rutland@arm.com>
Signed-off-by: NCatalin Marinas <catalin.marinas@arm.com>

arch/arm64/include/asm/exception.h

@@ -9,6 +9,7 @@
 
 #include <asm/esr.h>
 #include <asm/kprobes.h>
+#include <asm/ptrace.h>
 
 #include <linux/interrupt.h>
 
@@ -31,5 +32,26 @@ static inline u32 disr_to_esr(u64 disr)
 }
 
 asmlinkage void enter_from_user_mode(void);
+asmlinkage void do_mem_abort(unsigned long addr, unsigned int esr,
+			     struct pt_regs *regs);
+asmlinkage void do_sp_pc_abort(unsigned long addr, unsigned int esr,
+			       struct pt_regs *regs);
+asmlinkage void do_undefinstr(struct pt_regs *regs);
+asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr);
+asmlinkage void do_debug_exception(unsigned long addr_if_watchpoint,
+				   unsigned int esr, struct pt_regs *regs);
+asmlinkage void do_fpsimd_acc(unsigned int esr, struct pt_regs *regs);
+asmlinkage void do_sve_acc(unsigned int esr, struct pt_regs *regs);
+asmlinkage void do_fpsimd_exc(unsigned int esr, struct pt_regs *regs);
+asmlinkage void do_sysinstr(unsigned int esr, struct pt_regs *regs);
+asmlinkage void do_sp_pc_abort(unsigned long addr, unsigned int esr,
+			       struct pt_regs *regs);
+asmlinkage void bad_el0_sync(struct pt_regs *regs, int reason,
+			     unsigned int esr);
+asmlinkage void do_cp15instr(unsigned int esr, struct pt_regs *regs);
+asmlinkage void el0_svc_handler(struct pt_regs *regs);
+asmlinkage void el0_svc_compat_handler(struct pt_regs *regs);
+asmlinkage void do_el0_ia_bp_hardening(unsigned long addr,  unsigned int esr,
+				       struct pt_regs *regs);
 
 #endif	/* __ASM_EXCEPTION_H */