11da177e4SLinus Torvalds/* 21da177e4SLinus Torvalds * This file is subject to the terms and conditions of the GNU General Public 31da177e4SLinus Torvalds * License. See the file "COPYING" in the main directory of this archive 41da177e4SLinus Torvalds * for more details. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle 71da177e4SLinus Torvalds * Copyright (C) 1999, 2000 Silicon Graphics, Inc. 81da177e4SLinus Torvalds * Copyright (C) 2001 MIPS Technologies, Inc. 91da177e4SLinus Torvalds */ 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds#include <asm/asm.h> 121da177e4SLinus Torvalds#include <asm/asmmacro.h> 13aebac993SMarkos Chandras#include <asm/compiler.h> 14*d8550860SPaul Burton#include <asm/irqflags.h> 151da177e4SLinus Torvalds#include <asm/regdef.h> 161da177e4SLinus Torvalds#include <asm/mipsregs.h> 171da177e4SLinus Torvalds#include <asm/stackframe.h> 181da177e4SLinus Torvalds#include <asm/isadep.h> 191da177e4SLinus Torvalds#include <asm/thread_info.h> 201da177e4SLinus Torvalds#include <asm/war.h> 211da177e4SLinus Torvalds 22f431baa5SAtsushi Nemoto#ifndef CONFIG_PREEMPT 231da177e4SLinus Torvalds#define resume_kernel restore_all 247da8a581SFranck Bui-Huu#else 257da8a581SFranck Bui-Huu#define __ret_from_irq ret_from_exception 261da177e4SLinus Torvalds#endif 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds .text 291da177e4SLinus Torvalds .align 5 307da8a581SFranck Bui-Huu#ifndef CONFIG_PREEMPT 317da8a581SFranck Bui-HuuFEXPORT(ret_from_exception) 327da8a581SFranck Bui-Huu local_irq_disable # preempt stop 337da8a581SFranck Bui-Huu b __ret_from_irq 347da8a581SFranck Bui-Huu#endif 35f431baa5SAtsushi NemotoFEXPORT(ret_from_irq) 36f431baa5SAtsushi Nemoto LONG_S s0, TI_REGS($28) 377da8a581SFranck Bui-HuuFEXPORT(__ret_from_irq) 38c90e6fbbSDmitry Adamushko/* 39c90e6fbbSDmitry Adamushko * We can be coming here from a syscall done in the kernel space, 40c90e6fbbSDmitry Adamushko * e.g. a failed kernel_execve(). 41c90e6fbbSDmitry Adamushko */ 42c90e6fbbSDmitry Adamushkoresume_userspace_check: 431da177e4SLinus Torvalds LONG_L t0, PT_STATUS(sp) # returning to kernel mode? 441da177e4SLinus Torvalds andi t0, t0, KU_USER 451da177e4SLinus Torvalds beqz t0, resume_kernel 461da177e4SLinus Torvalds 47c2648527SThiemo Seuferresume_userspace: 48c2648527SThiemo Seufer local_irq_disable # make sure we dont miss an 491da177e4SLinus Torvalds # interrupt setting need_resched 501da177e4SLinus Torvalds # between sampling and return 511da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) # current->work 52c2648527SThiemo Seufer andi t0, a2, _TIF_WORK_MASK # (ignoring syscall_trace) 53c2648527SThiemo Seufer bnez t0, work_pending 541da177e4SLinus Torvalds j restore_all 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds#ifdef CONFIG_PREEMPT 57c2648527SThiemo Seuferresume_kernel: 58a18815abSRalf Baechle local_irq_disable 591da177e4SLinus Torvalds lw t0, TI_PRE_COUNT($28) 601da177e4SLinus Torvalds bnez t0, restore_all 611da177e4SLinus Torvaldsneed_resched: 621da177e4SLinus Torvalds LONG_L t0, TI_FLAGS($28) 631da177e4SLinus Torvalds andi t1, t0, _TIF_NEED_RESCHED 641da177e4SLinus Torvalds beqz t1, restore_all 651da177e4SLinus Torvalds LONG_L t0, PT_STATUS(sp) # Interrupts off? 661da177e4SLinus Torvalds andi t0, 1 671da177e4SLinus Torvalds beqz t0, restore_all 68a18815abSRalf Baechle jal preempt_schedule_irq 69cdaed73aSRalf Baechle b need_resched 701da177e4SLinus Torvalds#endif 711da177e4SLinus Torvalds 728f54bcacSAl ViroFEXPORT(ret_from_kernel_thread) 738f54bcacSAl Viro jal schedule_tail # a0 = struct task_struct *prev 748f54bcacSAl Viro move a0, s1 758f54bcacSAl Viro jal s0 769b0e5d42SAl Viro j syscall_exit 778f54bcacSAl Viro 781da177e4SLinus TorvaldsFEXPORT(ret_from_fork) 7936c8b586SIngo Molnar jal schedule_tail # a0 = struct task_struct *prev 801da177e4SLinus Torvalds 811da177e4SLinus TorvaldsFEXPORT(syscall_exit) 821da177e4SLinus Torvalds local_irq_disable # make sure need_resched and 831da177e4SLinus Torvalds # signals dont change between 841da177e4SLinus Torvalds # sampling and return 851da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) # current->work 861da177e4SLinus Torvalds li t0, _TIF_ALLWORK_MASK 871da177e4SLinus Torvalds and t0, a2, t0 881da177e4SLinus Torvalds bnez t0, syscall_exit_work 891da177e4SLinus Torvalds 9002f884edSAl Virorestore_all: # restore full frame 911da177e4SLinus Torvalds .set noat 921da177e4SLinus Torvalds RESTORE_TEMP 931da177e4SLinus Torvalds RESTORE_AT 941da177e4SLinus Torvalds RESTORE_STATIC 9502f884edSAl Virorestore_partial: # restore partial frame 96192ef366SRalf Baechle#ifdef CONFIG_TRACE_IRQFLAGS 97192ef366SRalf Baechle SAVE_STATIC 98192ef366SRalf Baechle SAVE_AT 99192ef366SRalf Baechle SAVE_TEMP 100192ef366SRalf Baechle LONG_L v0, PT_STATUS(sp) 101cbde5ebcSChris Dearman#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) 102cbde5ebcSChris Dearman and v0, ST0_IEP 103cbde5ebcSChris Dearman#else 104cbde5ebcSChris Dearman and v0, ST0_IE 105cbde5ebcSChris Dearman#endif 106192ef366SRalf Baechle beqz v0, 1f 107192ef366SRalf Baechle jal trace_hardirqs_on 108192ef366SRalf Baechle b 2f 109192ef366SRalf Baechle1: jal trace_hardirqs_off 110192ef366SRalf Baechle2: 111192ef366SRalf Baechle RESTORE_TEMP 112192ef366SRalf Baechle RESTORE_AT 113192ef366SRalf Baechle RESTORE_STATIC 114192ef366SRalf Baechle#endif 1151da177e4SLinus Torvalds RESTORE_SOME 1161da177e4SLinus Torvalds RESTORE_SP_AND_RET 1171da177e4SLinus Torvalds .set at 1181da177e4SLinus Torvalds 119c2648527SThiemo Seuferwork_pending: 120c2648527SThiemo Seufer andi t0, a2, _TIF_NEED_RESCHED # a2 is preloaded with TI_FLAGS 1211da177e4SLinus Torvalds beqz t0, work_notifysig 1221da177e4SLinus Torvaldswork_resched: 123*d8550860SPaul Burton TRACE_IRQS_OFF 1241da177e4SLinus Torvalds jal schedule 1251da177e4SLinus Torvalds 126c2648527SThiemo Seufer local_irq_disable # make sure need_resched and 1271da177e4SLinus Torvalds # signals dont change between 1281da177e4SLinus Torvalds # sampling and return 1291da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) 1301da177e4SLinus Torvalds andi t0, a2, _TIF_WORK_MASK # is there any work to be done 1311da177e4SLinus Torvalds # other than syscall tracing? 1321da177e4SLinus Torvalds beqz t0, restore_all 1331da177e4SLinus Torvalds andi t0, a2, _TIF_NEED_RESCHED 1341da177e4SLinus Torvalds bnez t0, work_resched 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvaldswork_notifysig: # deal with pending signals and 1371da177e4SLinus Torvalds # notify-resume requests 1381da177e4SLinus Torvalds move a0, sp 1391da177e4SLinus Torvalds li a1, 0 1401da177e4SLinus Torvalds jal do_notify_resume # a2 already loaded 141c90e6fbbSDmitry Adamushko j resume_userspace_check 1421da177e4SLinus Torvalds 14302f884edSAl ViroFEXPORT(syscall_exit_partial) 14402f884edSAl Viro local_irq_disable # make sure need_resched doesn't 14502f884edSAl Viro # change between and return 14602f884edSAl Viro LONG_L a2, TI_FLAGS($28) # current->work 14702f884edSAl Viro li t0, _TIF_ALLWORK_MASK 14802f884edSAl Viro and t0, a2 14902f884edSAl Viro beqz t0, restore_partial 1501da177e4SLinus Torvalds SAVE_STATIC 151c2648527SThiemo Seufersyscall_exit_work: 152f76f3308SAl Viro LONG_L t0, PT_STATUS(sp) # returning to kernel mode? 153f76f3308SAl Viro andi t0, t0, KU_USER 154f76f3308SAl Viro beqz t0, resume_kernel 155c19c20acSRalf Baechle li t0, _TIF_WORK_SYSCALL_EXIT 156c2648527SThiemo Seufer and t0, a2 # a2 is preloaded with TI_FLAGS 157c2648527SThiemo Seufer beqz t0, work_pending # trace bit set? 1588b659a39SRalf Baechle local_irq_enable # could let syscall_trace_leave() 1591da177e4SLinus Torvalds # call schedule() instead 160*d8550860SPaul Burton TRACE_IRQS_ON 1611da177e4SLinus Torvalds move a0, sp 1628b659a39SRalf Baechle jal syscall_trace_leave 1631da177e4SLinus Torvalds b resume_userspace 164bce1a286SRalf Baechle 1656ebb496fSMarkos Chandras#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) || \ 1666ebb496fSMarkos Chandras defined(CONFIG_MIPS_MT) 167bce1a286SRalf Baechle 168bce1a286SRalf Baechle/* 169bce1a286SRalf Baechle * MIPS32R2 Instruction Hazard Barrier - must be called 170bce1a286SRalf Baechle * 171bce1a286SRalf Baechle * For C code use the inline version named instruction_hazard(). 172bce1a286SRalf Baechle */ 173bce1a286SRalf BaechleLEAF(mips_ihb) 174aebac993SMarkos Chandras .set MIPS_ISA_LEVEL_RAW 175bce1a286SRalf Baechle jr.hb ra 176bce1a286SRalf Baechle nop 177bce1a286SRalf Baechle END(mips_ihb) 178bce1a286SRalf Baechle 1796ebb496fSMarkos Chandras#endif /* CONFIG_CPU_MIPSR2 or CONFIG_CPU_MIPSR6 or CONFIG_MIPS_MT */ 180