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> 14d8550860SPaul 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 21098fa51bSThomas Gleixner#ifndef CONFIG_PREEMPTION 221da177e4SLinus Torvalds#define resume_kernel restore_all 237da8a581SFranck Bui-Huu#else 247da8a581SFranck Bui-Huu#define __ret_from_irq ret_from_exception 251da177e4SLinus Torvalds#endif 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds .text 281da177e4SLinus Torvalds .align 5 29098fa51bSThomas Gleixner#ifndef CONFIG_PREEMPTION 307da8a581SFranck Bui-HuuFEXPORT(ret_from_exception) 317da8a581SFranck Bui-Huu local_irq_disable # preempt stop 327da8a581SFranck Bui-Huu b __ret_from_irq 337da8a581SFranck Bui-Huu#endif 34f431baa5SAtsushi NemotoFEXPORT(ret_from_irq) 35f431baa5SAtsushi Nemoto LONG_S s0, TI_REGS($28) 367da8a581SFranck Bui-HuuFEXPORT(__ret_from_irq) 37c90e6fbbSDmitry Adamushko/* 38c90e6fbbSDmitry Adamushko * We can be coming here from a syscall done in the kernel space, 39c90e6fbbSDmitry Adamushko * e.g. a failed kernel_execve(). 40c90e6fbbSDmitry Adamushko */ 41c90e6fbbSDmitry Adamushkoresume_userspace_check: 421da177e4SLinus Torvalds LONG_L t0, PT_STATUS(sp) # returning to kernel mode? 431da177e4SLinus Torvalds andi t0, t0, KU_USER 441da177e4SLinus Torvalds beqz t0, resume_kernel 451da177e4SLinus Torvalds 46c2648527SThiemo Seuferresume_userspace: 47c2648527SThiemo Seufer local_irq_disable # make sure we dont miss an 481da177e4SLinus Torvalds # interrupt setting need_resched 491da177e4SLinus Torvalds # between sampling and return 501da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) # current->work 51c2648527SThiemo Seufer andi t0, a2, _TIF_WORK_MASK # (ignoring syscall_trace) 52c2648527SThiemo Seufer bnez t0, work_pending 531da177e4SLinus Torvalds j restore_all 541da177e4SLinus Torvalds 55098fa51bSThomas Gleixner#ifdef CONFIG_PREEMPTION 56c2648527SThiemo Seuferresume_kernel: 57a18815abSRalf Baechle local_irq_disable 581da177e4SLinus Torvalds lw t0, TI_PRE_COUNT($28) 591da177e4SLinus Torvalds bnez t0, restore_all 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 66b8f3b15aSValentin Schneider PTR_LA ra, restore_all 67b8f3b15aSValentin Schneider j preempt_schedule_irq 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) 809bcf5359SPaul Burton#ifdef CONFIG_DEBUG_RSEQ 819bcf5359SPaul Burton move a0, sp 829bcf5359SPaul Burton jal rseq_syscall 839bcf5359SPaul Burton#endif 841da177e4SLinus Torvalds local_irq_disable # make sure need_resched and 851da177e4SLinus Torvalds # signals dont change between 861da177e4SLinus Torvalds # sampling and return 871da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) # current->work 881da177e4SLinus Torvalds li t0, _TIF_ALLWORK_MASK 891da177e4SLinus Torvalds and t0, a2, t0 901da177e4SLinus Torvalds bnez t0, syscall_exit_work 911da177e4SLinus Torvalds 9202f884edSAl Virorestore_all: # restore full frame 931da177e4SLinus Torvalds .set noat 941da177e4SLinus Torvalds RESTORE_TEMP 951da177e4SLinus Torvalds RESTORE_AT 961da177e4SLinus Torvalds RESTORE_STATIC 9702f884edSAl Virorestore_partial: # restore partial frame 98192ef366SRalf Baechle#ifdef CONFIG_TRACE_IRQFLAGS 99192ef366SRalf Baechle SAVE_STATIC 100192ef366SRalf Baechle SAVE_AT 101192ef366SRalf Baechle SAVE_TEMP 102192ef366SRalf Baechle LONG_L v0, PT_STATUS(sp) 103*455481fcSThomas Bogendoerfer#if defined(CONFIG_CPU_R3000) 104cbde5ebcSChris Dearman and v0, ST0_IEP 105cbde5ebcSChris Dearman#else 106cbde5ebcSChris Dearman and v0, ST0_IE 107cbde5ebcSChris Dearman#endif 108192ef366SRalf Baechle beqz v0, 1f 109192ef366SRalf Baechle jal trace_hardirqs_on 110192ef366SRalf Baechle b 2f 111192ef366SRalf Baechle1: jal trace_hardirqs_off 112192ef366SRalf Baechle2: 113192ef366SRalf Baechle RESTORE_TEMP 114192ef366SRalf Baechle RESTORE_AT 115192ef366SRalf Baechle RESTORE_STATIC 116192ef366SRalf Baechle#endif 1171da177e4SLinus Torvalds RESTORE_SOME 1181da177e4SLinus Torvalds RESTORE_SP_AND_RET 1191da177e4SLinus Torvalds .set at 1201da177e4SLinus Torvalds 121c2648527SThiemo Seuferwork_pending: 122c2648527SThiemo Seufer andi t0, a2, _TIF_NEED_RESCHED # a2 is preloaded with TI_FLAGS 1231da177e4SLinus Torvalds beqz t0, work_notifysig 1241da177e4SLinus Torvaldswork_resched: 125d8550860SPaul Burton TRACE_IRQS_OFF 1261da177e4SLinus Torvalds jal schedule 1271da177e4SLinus Torvalds 128c2648527SThiemo Seufer local_irq_disable # make sure need_resched and 1291da177e4SLinus Torvalds # signals dont change between 1301da177e4SLinus Torvalds # sampling and return 1311da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) 1321da177e4SLinus Torvalds andi t0, a2, _TIF_WORK_MASK # is there any work to be done 1331da177e4SLinus Torvalds # other than syscall tracing? 1341da177e4SLinus Torvalds beqz t0, restore_all 1351da177e4SLinus Torvalds andi t0, a2, _TIF_NEED_RESCHED 1361da177e4SLinus Torvalds bnez t0, work_resched 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvaldswork_notifysig: # deal with pending signals and 1391da177e4SLinus Torvalds # notify-resume requests 1401da177e4SLinus Torvalds move a0, sp 1411da177e4SLinus Torvalds li a1, 0 1421da177e4SLinus Torvalds jal do_notify_resume # a2 already loaded 143c90e6fbbSDmitry Adamushko j resume_userspace_check 1441da177e4SLinus Torvalds 14502f884edSAl ViroFEXPORT(syscall_exit_partial) 1469bcf5359SPaul Burton#ifdef CONFIG_DEBUG_RSEQ 1479bcf5359SPaul Burton move a0, sp 1489bcf5359SPaul Burton jal rseq_syscall 1499bcf5359SPaul Burton#endif 15002f884edSAl Viro local_irq_disable # make sure need_resched doesn't 15102f884edSAl Viro # change between and return 15202f884edSAl Viro LONG_L a2, TI_FLAGS($28) # current->work 15302f884edSAl Viro li t0, _TIF_ALLWORK_MASK 15402f884edSAl Viro and t0, a2 15502f884edSAl Viro beqz t0, restore_partial 1561da177e4SLinus Torvalds SAVE_STATIC 157c2648527SThiemo Seufersyscall_exit_work: 158f76f3308SAl Viro LONG_L t0, PT_STATUS(sp) # returning to kernel mode? 159f76f3308SAl Viro andi t0, t0, KU_USER 160f76f3308SAl Viro beqz t0, resume_kernel 161c19c20acSRalf Baechle li t0, _TIF_WORK_SYSCALL_EXIT 162c2648527SThiemo Seufer and t0, a2 # a2 is preloaded with TI_FLAGS 163c2648527SThiemo Seufer beqz t0, work_pending # trace bit set? 1648b659a39SRalf Baechle local_irq_enable # could let syscall_trace_leave() 1651da177e4SLinus Torvalds # call schedule() instead 166d8550860SPaul Burton TRACE_IRQS_ON 1671da177e4SLinus Torvalds move a0, sp 1688b659a39SRalf Baechle jal syscall_trace_leave 1691da177e4SLinus Torvalds b resume_userspace 170bce1a286SRalf Baechle 171ab7c01fdSSerge Semin#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR5) || \ 172ab7c01fdSSerge Semin defined(CONFIG_CPU_MIPSR6) || defined(CONFIG_MIPS_MT) 173bce1a286SRalf Baechle 174bce1a286SRalf Baechle/* 175bce1a286SRalf Baechle * MIPS32R2 Instruction Hazard Barrier - must be called 176bce1a286SRalf Baechle * 177bce1a286SRalf Baechle * For C code use the inline version named instruction_hazard(). 178bce1a286SRalf Baechle */ 179bce1a286SRalf BaechleLEAF(mips_ihb) 180aebac993SMarkos Chandras .set MIPS_ISA_LEVEL_RAW 181bce1a286SRalf Baechle jr.hb ra 182bce1a286SRalf Baechle nop 183bce1a286SRalf Baechle END(mips_ihb) 184bce1a286SRalf Baechle 185ab7c01fdSSerge Semin#endif /* CONFIG_CPU_MIPSR2 - CONFIG_CPU_MIPSR6 or CONFIG_MIPS_MT */ 186