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 22#ifndef CONFIG_MIPS32_COMPAT 23/* Neither O32 nor N32, so define handle_sys here */ 24#define handle_sys64 handle_sys 25#endif 26 27 .align 5 28NESTED(handle_sys64, PT_SIZE, sp) 29#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32) 30 /* 31 * When 32-bit compatibility is configured scall_o32.S 32 * already did this. 33 */ 34 .set noat 35 SAVE_SOME 36 TRACE_IRQS_ON_RELOAD 37 STI 38 .set at 39#endif 40 41#if !defined(CONFIG_MIPS32_O32) && !defined(CONFIG_MIPS32_N32) 42 ld t1, PT_EPC(sp) # skip syscall on return 43 daddiu t1, 4 # skip to next instruction 44 sd t1, PT_EPC(sp) 45#endif 46 47 sd a3, PT_R26(sp) # save a3 for syscall restarting 48 49 LONG_S v0, TI_SYSCALL($28) # Store syscall number 50 51 li t1, _TIF_WORK_SYSCALL_ENTRY 52 LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? 53 and t0, t1, t0 54 bnez t0, syscall_trace_entry 55 56syscall_common: 57 dsubu t2, v0, __NR_64_Linux 58 sltiu t0, t2, __NR_64_Linux_syscalls 59 beqz t0, illegal_syscall 60 61 dsll t0, t2, 3 # offset into table 62 dla t2, sys_call_table 63 daddu t0, t2, t0 64 ld t2, (t0) # syscall routine 65 beqz t2, illegal_syscall 66 67 jalr t2 # Do The Real Thing (TM) 68 69 li t0, -EMAXERRNO - 1 # error? 70 sltu t0, t0, v0 71 sd t0, PT_R7(sp) # set error flag 72 beqz t0, 1f 73 74 ld t1, PT_R2(sp) # syscall number 75 dnegu v0 # error 76 sd t1, PT_R0(sp) # save it for syscall restarting 771: sd v0, PT_R2(sp) # result 78 79n64_syscall_exit: 80 j syscall_exit_partial 81 82/* ------------------------------------------------------------------------ */ 83 84syscall_trace_entry: 85 SAVE_STATIC 86 move a0, sp 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_WD entry 113 .align 3 114 .type sys_call_table, @object 115EXPORT(sys_call_table) 116#include <asm/syscall_table_n64.h> 117