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#include <linux/config.h> 111da177e4SLinus Torvalds 121da177e4SLinus Torvalds#include <asm/asm.h> 131da177e4SLinus Torvalds#include <asm/asmmacro.h> 141da177e4SLinus Torvalds#include <asm/regdef.h> 151da177e4SLinus Torvalds#include <asm/mipsregs.h> 161da177e4SLinus Torvalds#include <asm/stackframe.h> 171da177e4SLinus Torvalds#include <asm/isadep.h> 181da177e4SLinus Torvalds#include <asm/thread_info.h> 191da177e4SLinus Torvalds#include <asm/war.h> 2041c594abSRalf Baechle#ifdef CONFIG_MIPS_MT_SMTC 2141c594abSRalf Baechle#include <asm/mipsmtregs.h> 2241c594abSRalf Baechle#endif 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds#ifdef CONFIG_PREEMPT 25c2648527SThiemo Seufer .macro preempt_stop 261da177e4SLinus Torvalds .endm 271da177e4SLinus Torvalds#else 28c2648527SThiemo Seufer .macro preempt_stop 29c2648527SThiemo Seufer local_irq_disable 301da177e4SLinus Torvalds .endm 311da177e4SLinus Torvalds#define resume_kernel restore_all 321da177e4SLinus Torvalds#endif 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds .text 351da177e4SLinus Torvalds .align 5 361da177e4SLinus TorvaldsFEXPORT(ret_from_exception) 371da177e4SLinus Torvalds preempt_stop 381da177e4SLinus TorvaldsFEXPORT(ret_from_irq) 391da177e4SLinus Torvalds LONG_L t0, PT_STATUS(sp) # returning to kernel mode? 401da177e4SLinus Torvalds andi t0, t0, KU_USER 411da177e4SLinus Torvalds beqz t0, resume_kernel 421da177e4SLinus Torvalds 43c2648527SThiemo Seuferresume_userspace: 44c2648527SThiemo Seufer local_irq_disable # make sure we dont miss an 451da177e4SLinus Torvalds # interrupt setting need_resched 461da177e4SLinus Torvalds # between sampling and return 471da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) # current->work 48c2648527SThiemo Seufer andi t0, a2, _TIF_WORK_MASK # (ignoring syscall_trace) 49c2648527SThiemo Seufer bnez t0, work_pending 501da177e4SLinus Torvalds j restore_all 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds#ifdef CONFIG_PREEMPT 53c2648527SThiemo Seuferresume_kernel: 54a18815abSRalf Baechle local_irq_disable 551da177e4SLinus Torvalds lw t0, TI_PRE_COUNT($28) 561da177e4SLinus Torvalds bnez t0, restore_all 571da177e4SLinus Torvaldsneed_resched: 581da177e4SLinus Torvalds LONG_L t0, TI_FLAGS($28) 591da177e4SLinus Torvalds andi t1, t0, _TIF_NEED_RESCHED 601da177e4SLinus Torvalds beqz t1, restore_all 611da177e4SLinus Torvalds LONG_L t0, PT_STATUS(sp) # Interrupts off? 621da177e4SLinus Torvalds andi t0, 1 631da177e4SLinus Torvalds beqz t0, restore_all 64a18815abSRalf Baechle jal preempt_schedule_irq 65cdaed73aSRalf Baechle b need_resched 661da177e4SLinus Torvalds#endif 671da177e4SLinus Torvalds 681da177e4SLinus TorvaldsFEXPORT(ret_from_fork) 691da177e4SLinus Torvalds jal schedule_tail # a0 = task_t *prev 701da177e4SLinus Torvalds 711da177e4SLinus TorvaldsFEXPORT(syscall_exit) 721da177e4SLinus Torvalds local_irq_disable # make sure need_resched and 731da177e4SLinus Torvalds # signals dont change between 741da177e4SLinus Torvalds # sampling and return 751da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) # current->work 761da177e4SLinus Torvalds li t0, _TIF_ALLWORK_MASK 771da177e4SLinus Torvalds and t0, a2, t0 781da177e4SLinus Torvalds bnez t0, syscall_exit_work 791da177e4SLinus Torvalds 801da177e4SLinus TorvaldsFEXPORT(restore_all) # restore full frame 8141c594abSRalf Baechle#ifdef CONFIG_MIPS_MT_SMTC 8241c594abSRalf Baechle/* Detect and execute deferred IPI "interrupts" */ 8341c594abSRalf Baechle move a0,sp 8441c594abSRalf Baechle jal deferred_smtc_ipi 8541c594abSRalf Baechle/* Re-arm any temporarily masked interrupts not explicitly "acked" */ 8641c594abSRalf Baechle mfc0 v0, CP0_TCSTATUS 8741c594abSRalf Baechle ori v1, v0, TCSTATUS_IXMT 8841c594abSRalf Baechle mtc0 v1, CP0_TCSTATUS 8941c594abSRalf Baechle andi v0, TCSTATUS_IXMT 90*4277ff5eSRalf Baechle _ehb 9141c594abSRalf Baechle mfc0 t0, CP0_TCCONTEXT 9241c594abSRalf Baechle DMT 9 # dmt t1 9341c594abSRalf Baechle jal mips_ihb 9441c594abSRalf Baechle mfc0 t2, CP0_STATUS 9541c594abSRalf Baechle andi t3, t0, 0xff00 9641c594abSRalf Baechle or t2, t2, t3 9741c594abSRalf Baechle mtc0 t2, CP0_STATUS 98*4277ff5eSRalf Baechle _ehb 9941c594abSRalf Baechle andi t1, t1, VPECONTROL_TE 10041c594abSRalf Baechle beqz t1, 1f 10141c594abSRalf Baechle EMT 10241c594abSRalf Baechle1: 10341c594abSRalf Baechle mfc0 v1, CP0_TCSTATUS 104477654fcSRalf Baechle /* We set IXMT above, XOR should clear it here */ 10541c594abSRalf Baechle xori v1, v1, TCSTATUS_IXMT 10641c594abSRalf Baechle or v1, v0, v1 10741c594abSRalf Baechle mtc0 v1, CP0_TCSTATUS 108*4277ff5eSRalf Baechle _ehb 10941c594abSRalf Baechle xor t0, t0, t3 11041c594abSRalf Baechle mtc0 t0, CP0_TCCONTEXT 11141c594abSRalf Baechle#endif /* CONFIG_MIPS_MT_SMTC */ 1121da177e4SLinus Torvalds .set noat 1131da177e4SLinus Torvalds RESTORE_TEMP 1141da177e4SLinus Torvalds RESTORE_AT 1151da177e4SLinus Torvalds RESTORE_STATIC 1161da177e4SLinus TorvaldsFEXPORT(restore_partial) # restore partial frame 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: 1251da177e4SLinus Torvalds jal schedule 1261da177e4SLinus Torvalds 127c2648527SThiemo Seufer local_irq_disable # make sure need_resched and 1281da177e4SLinus Torvalds # signals dont change between 1291da177e4SLinus Torvalds # sampling and return 1301da177e4SLinus Torvalds LONG_L a2, TI_FLAGS($28) 1311da177e4SLinus Torvalds andi t0, a2, _TIF_WORK_MASK # is there any work to be done 1321da177e4SLinus Torvalds # other than syscall tracing? 1331da177e4SLinus Torvalds beqz t0, restore_all 1341da177e4SLinus Torvalds andi t0, a2, _TIF_NEED_RESCHED 1351da177e4SLinus Torvalds bnez t0, work_resched 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvaldswork_notifysig: # deal with pending signals and 1381da177e4SLinus Torvalds # notify-resume requests 1391da177e4SLinus Torvalds move a0, sp 1401da177e4SLinus Torvalds li a1, 0 1411da177e4SLinus Torvalds jal do_notify_resume # a2 already loaded 1420bf0e3e2SRalf Baechle j resume_userspace 1431da177e4SLinus Torvalds 1441da177e4SLinus TorvaldsFEXPORT(syscall_exit_work_partial) 1451da177e4SLinus Torvalds SAVE_STATIC 146c2648527SThiemo Seufersyscall_exit_work: 147c2648527SThiemo Seufer li t0, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT 148c2648527SThiemo Seufer and t0, a2 # a2 is preloaded with TI_FLAGS 149c2648527SThiemo Seufer beqz t0, work_pending # trace bit set? 1501da177e4SLinus Torvalds local_irq_enable # could let do_syscall_trace() 1511da177e4SLinus Torvalds # call schedule() instead 1521da177e4SLinus Torvalds move a0, sp 1531da177e4SLinus Torvalds li a1, 1 1541da177e4SLinus Torvalds jal do_syscall_trace 1551da177e4SLinus Torvalds b resume_userspace 156bce1a286SRalf Baechle 157bce1a286SRalf Baechle#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_MIPS_MT) 158bce1a286SRalf Baechle 159bce1a286SRalf Baechle/* 160bce1a286SRalf Baechle * MIPS32R2 Instruction Hazard Barrier - must be called 161bce1a286SRalf Baechle * 162bce1a286SRalf Baechle * For C code use the inline version named instruction_hazard(). 163bce1a286SRalf Baechle */ 164bce1a286SRalf BaechleLEAF(mips_ihb) 165bce1a286SRalf Baechle .set mips32r2 166bce1a286SRalf Baechle jr.hb ra 167bce1a286SRalf Baechle nop 168bce1a286SRalf Baechle END(mips_ihb) 169bce1a286SRalf Baechle 170bce1a286SRalf Baechle#endif /* CONFIG_CPU_MIPSR2 or CONFIG_MIPS_MT */ 171