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> 131da177e4SLinus Torvalds#include <asm/regdef.h> 141da177e4SLinus Torvalds#include <asm/mipsregs.h> 151da177e4SLinus Torvalds#include <asm/stackframe.h> 161da177e4SLinus Torvalds#include <asm/isadep.h> 171da177e4SLinus Torvalds#include <asm/thread_info.h> 181da177e4SLinus Torvalds#include <asm/war.h> 191da177e4SLinus Torvalds 20f431baa5SAtsushi Nemoto#ifndef CONFIG_PREEMPT 211da177e4SLinus Torvalds#define resume_kernel restore_all 227da8a581SFranck Bui-Huu#else 237da8a581SFranck Bui-Huu#define __ret_from_irq ret_from_exception 241da177e4SLinus Torvalds#endif 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds .text 271da177e4SLinus Torvalds .align 5 287da8a581SFranck Bui-Huu#ifndef CONFIG_PREEMPT 297da8a581SFranck Bui-HuuFEXPORT(ret_from_exception) 307da8a581SFranck Bui-Huu local_irq_disable # preempt stop 317da8a581SFranck Bui-Huu b __ret_from_irq 327da8a581SFranck Bui-Huu#endif 33f431baa5SAtsushi NemotoFEXPORT(ret_from_irq) 34f431baa5SAtsushi Nemoto LONG_S s0, TI_REGS($28) 357da8a581SFranck Bui-HuuFEXPORT(__ret_from_irq) 36c90e6fbbSDmitry Adamushko/* 37c90e6fbbSDmitry Adamushko * We can be coming here from a syscall done in the kernel space, 38c90e6fbbSDmitry Adamushko * e.g. a failed kernel_execve(). 39c90e6fbbSDmitry Adamushko */ 40c90e6fbbSDmitry Adamushkoresume_userspace_check: 411da177e4SLinus Torvalds LONG_L t0, PT_STATUS(sp) # returning to kernel mode? 421da177e4SLinus Torvalds andi t0, t0, KU_USER 431da177e4SLinus Torvalds beqz t0, resume_kernel 441da177e4SLinus Torvalds 45c2648527SThiemo Seuferresume_userspace: 46c2648527SThiemo Seufer local_irq_disable # make sure we dont miss an 471da177e4SLinus Torvalds # interrupt setting need_resched 481da177e4SLinus Torvalds # between sampling and return 491da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) # current->work 50c2648527SThiemo Seufer andi t0, a2, _TIF_WORK_MASK # (ignoring syscall_trace) 51c2648527SThiemo Seufer bnez t0, work_pending 521da177e4SLinus Torvalds j restore_all 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds#ifdef CONFIG_PREEMPT 55c2648527SThiemo Seuferresume_kernel: 56a18815abSRalf Baechle local_irq_disable 571da177e4SLinus Torvalds lw t0, TI_PRE_COUNT($28) 581da177e4SLinus Torvalds bnez t0, restore_all 591da177e4SLinus Torvaldsneed_resched: 601da177e4SLinus Torvalds LONG_L t0, TI_FLAGS($28) 611da177e4SLinus Torvalds andi t1, t0, _TIF_NEED_RESCHED 621da177e4SLinus Torvalds beqz t1, restore_all 631da177e4SLinus Torvalds LONG_L t0, PT_STATUS(sp) # Interrupts off? 641da177e4SLinus Torvalds andi t0, 1 651da177e4SLinus Torvalds beqz t0, restore_all 66a18815abSRalf Baechle jal preempt_schedule_irq 67cdaed73aSRalf Baechle b need_resched 681da177e4SLinus Torvalds#endif 691da177e4SLinus Torvalds 708f54bcacSAl ViroFEXPORT(ret_from_kernel_thread) 718f54bcacSAl Viro jal schedule_tail # a0 = struct task_struct *prev 728f54bcacSAl Viro move a0, s1 738f54bcacSAl Viro jal s0 749b0e5d42SAl Viro j syscall_exit 758f54bcacSAl Viro 761da177e4SLinus TorvaldsFEXPORT(ret_from_fork) 7736c8b586SIngo Molnar jal schedule_tail # a0 = struct task_struct *prev 781da177e4SLinus Torvalds 791da177e4SLinus TorvaldsFEXPORT(syscall_exit) 801da177e4SLinus Torvalds local_irq_disable # make sure need_resched and 811da177e4SLinus Torvalds # signals dont change between 821da177e4SLinus Torvalds # sampling and return 831da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) # current->work 841da177e4SLinus Torvalds li t0, _TIF_ALLWORK_MASK 851da177e4SLinus Torvalds and t0, a2, t0 861da177e4SLinus Torvalds bnez t0, syscall_exit_work 871da177e4SLinus Torvalds 8802f884edSAl Virorestore_all: # restore full frame 891da177e4SLinus Torvalds .set noat 901da177e4SLinus Torvalds RESTORE_TEMP 911da177e4SLinus Torvalds RESTORE_AT 921da177e4SLinus Torvalds RESTORE_STATIC 9302f884edSAl Virorestore_partial: # restore partial frame 94192ef366SRalf Baechle#ifdef CONFIG_TRACE_IRQFLAGS 95192ef366SRalf Baechle SAVE_STATIC 96192ef366SRalf Baechle SAVE_AT 97192ef366SRalf Baechle SAVE_TEMP 98192ef366SRalf Baechle LONG_L v0, PT_STATUS(sp) 99cbde5ebcSChris Dearman#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) 100cbde5ebcSChris Dearman and v0, ST0_IEP 101cbde5ebcSChris Dearman#else 102cbde5ebcSChris Dearman and v0, ST0_IE 103cbde5ebcSChris Dearman#endif 104192ef366SRalf Baechle beqz v0, 1f 105192ef366SRalf Baechle jal trace_hardirqs_on 106192ef366SRalf Baechle b 2f 107192ef366SRalf Baechle1: jal trace_hardirqs_off 108192ef366SRalf Baechle2: 109192ef366SRalf Baechle RESTORE_TEMP 110192ef366SRalf Baechle RESTORE_AT 111192ef366SRalf Baechle RESTORE_STATIC 112192ef366SRalf Baechle#endif 1131da177e4SLinus Torvalds RESTORE_SOME 1141da177e4SLinus Torvalds RESTORE_SP_AND_RET 1151da177e4SLinus Torvalds .set at 1161da177e4SLinus Torvalds 117c2648527SThiemo Seuferwork_pending: 118c2648527SThiemo Seufer andi t0, a2, _TIF_NEED_RESCHED # a2 is preloaded with TI_FLAGS 1191da177e4SLinus Torvalds beqz t0, work_notifysig 1201da177e4SLinus Torvaldswork_resched: 1211da177e4SLinus Torvalds jal schedule 1221da177e4SLinus Torvalds 123c2648527SThiemo Seufer local_irq_disable # make sure need_resched and 1241da177e4SLinus Torvalds # signals dont change between 1251da177e4SLinus Torvalds # sampling and return 1261da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) 1271da177e4SLinus Torvalds andi t0, a2, _TIF_WORK_MASK # is there any work to be done 1281da177e4SLinus Torvalds # other than syscall tracing? 1291da177e4SLinus Torvalds beqz t0, restore_all 1301da177e4SLinus Torvalds andi t0, a2, _TIF_NEED_RESCHED 1311da177e4SLinus Torvalds bnez t0, work_resched 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvaldswork_notifysig: # deal with pending signals and 1341da177e4SLinus Torvalds # notify-resume requests 1351da177e4SLinus Torvalds move a0, sp 1361da177e4SLinus Torvalds li a1, 0 1371da177e4SLinus Torvalds jal do_notify_resume # a2 already loaded 138c90e6fbbSDmitry Adamushko j resume_userspace_check 1391da177e4SLinus Torvalds 14002f884edSAl ViroFEXPORT(syscall_exit_partial) 14102f884edSAl Viro local_irq_disable # make sure need_resched doesn't 14202f884edSAl Viro # change between and return 14302f884edSAl Viro LONG_L a2, TI_FLAGS($28) # current->work 14402f884edSAl Viro li t0, _TIF_ALLWORK_MASK 14502f884edSAl Viro and t0, a2 14602f884edSAl Viro beqz t0, restore_partial 1471da177e4SLinus Torvalds SAVE_STATIC 148c2648527SThiemo Seufersyscall_exit_work: 149f76f3308SAl Viro LONG_L t0, PT_STATUS(sp) # returning to kernel mode? 150f76f3308SAl Viro andi t0, t0, KU_USER 151f76f3308SAl Viro beqz t0, resume_kernel 152c19c20acSRalf Baechle li t0, _TIF_WORK_SYSCALL_EXIT 153c2648527SThiemo Seufer and t0, a2 # a2 is preloaded with TI_FLAGS 154c2648527SThiemo Seufer beqz t0, work_pending # trace bit set? 1558b659a39SRalf Baechle local_irq_enable # could let syscall_trace_leave() 1561da177e4SLinus Torvalds # call schedule() instead 1571da177e4SLinus Torvalds move a0, sp 1588b659a39SRalf Baechle jal syscall_trace_leave 1591da177e4SLinus Torvalds b resume_userspace 160bce1a286SRalf Baechle 161*6ebb496fSMarkos Chandras#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) || \ 162*6ebb496fSMarkos Chandras defined(CONFIG_MIPS_MT) 163bce1a286SRalf Baechle 164bce1a286SRalf Baechle/* 165bce1a286SRalf Baechle * MIPS32R2 Instruction Hazard Barrier - must be called 166bce1a286SRalf Baechle * 167bce1a286SRalf Baechle * For C code use the inline version named instruction_hazard(). 168bce1a286SRalf Baechle */ 169bce1a286SRalf BaechleLEAF(mips_ihb) 170bce1a286SRalf Baechle .set mips32r2 171bce1a286SRalf Baechle jr.hb ra 172bce1a286SRalf Baechle nop 173bce1a286SRalf Baechle END(mips_ihb) 174bce1a286SRalf Baechle 175*6ebb496fSMarkos Chandras#endif /* CONFIG_CPU_MIPSR2 or CONFIG_CPU_MIPSR6 or CONFIG_MIPS_MT */ 176