1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 #include <linux/compat.h> 4 #include <linux/context_tracking.h> 5 #include <linux/randomize_kstack.h> 6 #include <linux/entry-common.h> 7 8 #include <asm/interrupt.h> 9 #include <asm/kup.h> 10 #include <asm/syscall.h> 11 #include <asm/time.h> 12 #include <asm/tm.h> 13 #include <asm/unistd.h> 14 15 16 /* Has to run notrace because it is entered not completely "reconciled" */ 17 notrace long system_call_exception(struct pt_regs *regs, unsigned long r0) 18 { 19 long ret; 20 syscall_fn f; 21 22 add_random_kstack_offset(); 23 r0 = syscall_enter_from_user_mode(regs, r0); 24 25 if (unlikely(r0 >= NR_syscalls)) { 26 if (unlikely(trap_is_unsupported_scv(regs))) { 27 /* Unsupported scv vector */ 28 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); 29 return regs->gpr[3]; 30 } 31 return -ENOSYS; 32 } 33 34 /* May be faster to do array_index_nospec? */ 35 barrier_nospec(); 36 37 #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER 38 // No COMPAT if we have SYSCALL_WRAPPER, see Kconfig 39 f = (void *)sys_call_table[r0]; 40 ret = f(regs); 41 #else 42 if (unlikely(is_compat_task())) { 43 unsigned long r3, r4, r5, r6, r7, r8; 44 45 f = (void *)compat_sys_call_table[r0]; 46 47 r3 = regs->gpr[3] & 0x00000000ffffffffULL; 48 r4 = regs->gpr[4] & 0x00000000ffffffffULL; 49 r5 = regs->gpr[5] & 0x00000000ffffffffULL; 50 r6 = regs->gpr[6] & 0x00000000ffffffffULL; 51 r7 = regs->gpr[7] & 0x00000000ffffffffULL; 52 r8 = regs->gpr[8] & 0x00000000ffffffffULL; 53 54 ret = f(r3, r4, r5, r6, r7, r8); 55 } else { 56 f = (void *)sys_call_table[r0]; 57 58 ret = f(regs->gpr[3], regs->gpr[4], regs->gpr[5], 59 regs->gpr[6], regs->gpr[7], regs->gpr[8]); 60 } 61 #endif 62 63 return ret; 64 } 65