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 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/thread_info.h> 18#include <asm/unistd.h> 19 20#ifndef CONFIG_MIPS32_O32 21/* No O32, so define handle_sys here */ 22#define handle_sysn32 handle_sys 23#endif 24 25 .align 5 26NESTED(handle_sysn32, PT_SIZE, sp) 27#ifndef CONFIG_MIPS32_O32 28 .set noat 29 SAVE_SOME 30 TRACE_IRQS_ON_RELOAD 31 STI 32 .set at 33#endif 34 35 dsubu t0, v0, __NR_N32_Linux # check syscall number 36 sltiu t0, t0, __NR_N32_Linux_syscalls 37 38#ifndef CONFIG_MIPS32_O32 39 ld t1, PT_EPC(sp) # skip syscall on return 40 daddiu t1, 4 # skip to next instruction 41 sd t1, PT_EPC(sp) 42#endif 43 beqz t0, not_n32_scall 44 45 sd a3, PT_R26(sp) # save a3 for syscall restarting 46 47 li t1, _TIF_WORK_SYSCALL_ENTRY 48 LONG_L t0, TI_FLAGS($28) # syscall tracing enabled? 49 and t0, t1, t0 50 bnez t0, n32_syscall_trace_entry 51 52syscall_common: 53 dsll t0, v0, 3 # offset into table 54 ld t2, (sysn32_call_table - (__NR_N32_Linux * 8))(t0) 55 56 jalr t2 # Do The Real Thing (TM) 57 58 li t0, -EMAXERRNO - 1 # error? 59 sltu t0, t0, v0 60 sd t0, PT_R7(sp) # set error flag 61 beqz t0, 1f 62 63 ld t1, PT_R2(sp) # syscall number 64 dnegu v0 # error 65 sd t1, PT_R0(sp) # save it for syscall restarting 661: sd v0, PT_R2(sp) # result 67 68 j syscall_exit_partial 69 70/* ------------------------------------------------------------------------ */ 71 72n32_syscall_trace_entry: 73 SAVE_STATIC 74 move a0, sp 75 move a1, v0 76 jal syscall_trace_enter 77 78 bltz v0, 1f # seccomp failed? Skip syscall 79 80 RESTORE_STATIC 81 ld v0, PT_R2(sp) # Restore syscall (maybe modified) 82 ld a0, PT_R4(sp) # Restore argument registers 83 ld a1, PT_R5(sp) 84 ld a2, PT_R6(sp) 85 ld a3, PT_R7(sp) 86 ld a4, PT_R8(sp) 87 ld a5, PT_R9(sp) 88 89 dsubu t2, v0, __NR_N32_Linux # check (new) syscall number 90 sltiu t0, t2, __NR_N32_Linux_syscalls 91 beqz t0, not_n32_scall 92 93 j syscall_common 94 951: j syscall_exit 96 97not_n32_scall: 98 /* This is not an n32 compatibility syscall, pass it on to 99 the n64 syscall handlers. */ 100 j handle_sys64 101 102 END(handle_sysn32) 103 104#define __SYSCALL(nr, entry) PTR entry 105 .type sysn32_call_table, @object 106EXPORT(sysn32_call_table) 107#include <asm/syscall_table_64_n32.h> 108#undef __SYSCALL 109