1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1995, 96, 97, 98, 99, 2000, 01, 02 by Ralf Baechle 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 8 * Copyright (C) 2001 MIPS Technologies, Inc. 9 */ 10#include <linux/errno.h> 11#include <asm/asm.h> 12#include <asm/asmmacro.h> 13#include <asm/irqflags.h> 14#include <asm/mipsregs.h> 15#include <asm/regdef.h> 16#include <asm/stackframe.h> 17#include <asm/asm-offsets.h> 18#include <asm/sysmips.h> 19#include <asm/thread_info.h> 20#include <asm/unistd.h> 21#include <asm/war.h> 22 23#ifndef CONFIG_BINFMT_ELF32 24/* Neither O32 nor N32, so define handle_sys here */ 25#define handle_sys64 handle_sys 26#endif 27 28 .align 5 29NESTED(handle_sys64, PT_SIZE, sp) 30#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32) 31 /* 32 * When 32-bit compatibility is configured scall_o32.S 33 * already did this. 34 */ 35 .set noat 36 SAVE_SOME 37 TRACE_IRQS_ON_RELOAD 38 STI 39 .set at 40#endif 41 42#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32) 43 ld t1, PT_EPC(sp) # skip syscall on return 44 daddiu t1, 4 # skip to next instruction 45 sd t1, PT_EPC(sp) 46#endif 47 48 sd a3, PT_R26(sp) # save a3 for syscall restarting 49 50 li t1, _TIF_WORK_SYSCALL_ENTRY 51 LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? 52 and t0, t1, t0 53 bnez t0, syscall_trace_entry 54 55syscall_common: 56 dsubu t2, v0, __NR_64_Linux 57 sltiu t0, t2, __NR_64_Linux_syscalls 58 beqz t0, illegal_syscall 59 60 dsll t0, t2, 3 # offset into table 61 dla t2, sys_call_table 62 daddu t0, t2, t0 63 ld t2, (t0) # syscall routine 64 beqz t2, illegal_syscall 65 66 jalr t2 # Do The Real Thing (TM) 67 68 li t0, -EMAXERRNO - 1 # error? 69 sltu t0, t0, v0 70 sd t0, PT_R7(sp) # set error flag 71 beqz t0, 1f 72 73 ld t1, PT_R2(sp) # syscall number 74 dnegu v0 # error 75 sd t1, PT_R0(sp) # save it for syscall restarting 761: sd v0, PT_R2(sp) # result 77 78n64_syscall_exit: 79 j syscall_exit_partial 80 81/* ------------------------------------------------------------------------ */ 82 83syscall_trace_entry: 84 SAVE_STATIC 85 move a0, sp 86 move a1, v0 87 jal syscall_trace_enter 88 89 bltz v0, 1f # seccomp failed? Skip syscall 90 91 RESTORE_STATIC 92 ld v0, PT_R2(sp) # Restore syscall (maybe modified) 93 ld a0, PT_R4(sp) # Restore argument registers 94 ld a1, PT_R5(sp) 95 ld a2, PT_R6(sp) 96 ld a3, PT_R7(sp) 97 ld a4, PT_R8(sp) 98 ld a5, PT_R9(sp) 99 j syscall_common 100 1011: j syscall_exit 102 103illegal_syscall: 104 /* This also isn't a 64-bit syscall, throw an error. */ 105 li v0, ENOSYS # error 106 sd v0, PT_R2(sp) 107 li t0, 1 # set error flag 108 sd t0, PT_R7(sp) 109 j n64_syscall_exit 110 END(handle_sys64) 111 112#define __SYSCALL(nr, entry) PTR entry 113 .align 3 114 .type sys_call_table, @object 115EXPORT(sys_call_table) 116#include <asm/syscall_table_64_n64.h> 117#undef __SYSCALL 118