1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 #include <linux/compat.h> 4 #include <linux/context_tracking.h> 5 #include <linux/entry-common.h> 6 7 #include <asm/interrupt.h> 8 #include <asm/kup.h> 9 #include <asm/syscall.h> 10 #include <asm/time.h> 11 #include <asm/tm.h> 12 #include <asm/unistd.h> 13 14 15 /* Has to run notrace because it is entered not completely "reconciled" */ 16 notrace long system_call_exception(struct pt_regs *regs, unsigned long r0) 17 { 18 long ret; 19 syscall_fn f; 20 21 if (unlikely(!syscall_enter_from_user_mode_randomize_stack(regs, &r0))) { 22 clear_thread_flag(TIF_SYSCALL_RET); 23 return syscall_get_error(current, regs); 24 } 25 26 if (unlikely(test_and_clear_thread_flag(TIF_SYSCALL_RET))) 27 return syscall_get_error(current, regs); 28 29 if (unlikely(r0 >= NR_syscalls)) { 30 if (unlikely(trap_is_unsupported_scv(regs))) { 31 /* Unsupported scv vector */ 32 _exception(SIGILL, regs, ILL_ILLOPC, regs->nip); 33 return regs->gpr[3]; 34 } 35 return -ENOSYS; 36 } 37 38 /* May be faster to do array_index_nospec? */ 39 barrier_nospec(); 40 41 #ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER 42 // No COMPAT if we have SYSCALL_WRAPPER, see Kconfig 43 f = (void *)sys_call_table[r0]; 44 ret = f(regs); 45 #else 46 if (unlikely(is_compat_task())) { 47 unsigned long r3, r4, r5, r6, r7, r8; 48 49 f = (void *)compat_sys_call_table[r0]; 50 51 r3 = regs->gpr[3] & 0x00000000ffffffffULL; 52 r4 = regs->gpr[4] & 0x00000000ffffffffULL; 53 r5 = regs->gpr[5] & 0x00000000ffffffffULL; 54 r6 = regs->gpr[6] & 0x00000000ffffffffULL; 55 r7 = regs->gpr[7] & 0x00000000ffffffffULL; 56 r8 = regs->gpr[8] & 0x00000000ffffffffULL; 57 58 ret = f(r3, r4, r5, r6, r7, r8); 59 } else { 60 f = (void *)sys_call_table[r0]; 61 62 ret = f(regs->gpr[3], regs->gpr[4], regs->gpr[5], 63 regs->gpr[6], regs->gpr[7], regs->gpr[8]); 64 } 65 #endif 66 67 return ret; 68 } 69