// SPDX-License-Identifier: GPL-2.0-or-later #include <linux/compat.h>#include <linux/context_tracking.h>#include <linux/entry-common.h> #include <asm/interrupt.h>#include <asm/kup.h>#include <asm/syscall.h>#include <asm/time.h>#include <asm/tm.h>#include <asm/unistd.h>  /* Has to run notrace because it is entered not completely "reconciled" */notrace long system_call_exception(struct pt_regs *regs, unsigned long r0){	long ret;	syscall_fn f; 	if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs, &r0))) {		clear_thread_flag(TIF_SYSCALL_RET);		return syscall_get_error(current, regs);	} 	if (unlikely(test_and_clear_thread_flag(TIF_SYSCALL_RET)))		return syscall_get_error(current, regs); 	if (unlikely(r0 >= NR_syscalls)) {		if (unlikely(trap_is_unsupported_scv(regs))) {			/* Unsupported scv vector */			_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);			return regs->gpr[3];		}		return -ENOSYS;	} 	/* May be faster to do array_index_nospec? */	barrier_nospec(); #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER	// No COMPAT if we have SYSCALL_WRAPPER, see Kconfig	f = (void *)sys_call_table[r0];	ret = f(regs);#else	if (unlikely(is_compat_task())) {		unsigned long r3, r4, r5, r6, r7, r8; 		f = (void *)compat_sys_call_table[r0]; 		r3 = regs->gpr[3] & 0x00000000ffffffffULL;		r4 = regs->gpr[4] & 0x00000000ffffffffULL;		r5 = regs->gpr[5] & 0x00000000ffffffffULL;		r6 = regs->gpr[6] & 0x00000000ffffffffULL;		r7 = regs->gpr[7] & 0x00000000ffffffffULL;		r8 = regs->gpr[8] & 0x00000000ffffffffULL; 		ret = f(r3, r4, r5, r6, r7, r8);	} else {		f = (void *)sys_call_table[r0]; 		ret = f(regs->gpr[3], regs->gpr[4], regs->gpr[5],			regs->gpr[6], regs->gpr[7], regs->gpr[8]);	}#endif 	return ret;}