| /* |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle |
| * Copyright (C) 1999, 2000 Silicon Graphics, Inc. |
| * Copyright (C) 2001 MIPS Technologies, Inc. |
| */ |
| #include <linux/config.h> |
| |
| #include <asm/asm.h> |
| #include <asm/asmmacro.h> |
| #include <asm/regdef.h> |
| #include <asm/mipsregs.h> |
| #include <asm/stackframe.h> |
| #include <asm/isadep.h> |
| #include <asm/thread_info.h> |
| #include <asm/war.h> |
| |
| #ifdef CONFIG_PREEMPT |
| .macro preempt_stop |
| .endm |
| #else |
| .macro preempt_stop |
| local_irq_disable |
| .endm |
| #define resume_kernel restore_all |
| #endif |
| |
| .text |
| .align 5 |
| FEXPORT(ret_from_exception) |
| preempt_stop |
| FEXPORT(ret_from_irq) |
| LONG_L t0, PT_STATUS(sp) # returning to kernel mode? |
| andi t0, t0, KU_USER |
| beqz t0, resume_kernel |
| |
| resume_userspace: |
| local_irq_disable # make sure we dont miss an |
| # interrupt setting need_resched |
| # between sampling and return |
| LONG_L a2, TI_FLAGS($28) # current->work |
| andi t0, a2, _TIF_WORK_MASK # (ignoring syscall_trace) |
| bnez t0, work_pending |
| j restore_all |
| |
| #ifdef CONFIG_PREEMPT |
| resume_kernel: |
| local_irq_disable |
| lw t0, TI_PRE_COUNT($28) |
| bnez t0, restore_all |
| need_resched: |
| LONG_L t0, TI_FLAGS($28) |
| andi t1, t0, _TIF_NEED_RESCHED |
| beqz t1, restore_all |
| LONG_L t0, PT_STATUS(sp) # Interrupts off? |
| andi t0, 1 |
| beqz t0, restore_all |
| jal preempt_schedule_irq |
| b need_resched |
| #endif |
| |
| FEXPORT(ret_from_fork) |
| jal schedule_tail # a0 = task_t *prev |
| |
| FEXPORT(syscall_exit) |
| local_irq_disable # make sure need_resched and |
| # signals dont change between |
| # sampling and return |
| LONG_L a2, TI_FLAGS($28) # current->work |
| li t0, _TIF_ALLWORK_MASK |
| and t0, a2, t0 |
| bnez t0, syscall_exit_work |
| |
| FEXPORT(restore_all) # restore full frame |
| .set noat |
| RESTORE_TEMP |
| RESTORE_AT |
| RESTORE_STATIC |
| FEXPORT(restore_partial) # restore partial frame |
| RESTORE_SOME |
| RESTORE_SP_AND_RET |
| .set at |
| |
| work_pending: |
| andi t0, a2, _TIF_NEED_RESCHED # a2 is preloaded with TI_FLAGS |
| beqz t0, work_notifysig |
| work_resched: |
| jal schedule |
| |
| local_irq_disable # make sure need_resched and |
| # signals dont change between |
| # sampling and return |
| LONG_L a2, TI_FLAGS($28) |
| andi t0, a2, _TIF_WORK_MASK # is there any work to be done |
| # other than syscall tracing? |
| beqz t0, restore_all |
| andi t0, a2, _TIF_NEED_RESCHED |
| bnez t0, work_resched |
| |
| work_notifysig: # deal with pending signals and |
| # notify-resume requests |
| move a0, sp |
| li a1, 0 |
| jal do_notify_resume # a2 already loaded |
| j resume_userspace |
| |
| FEXPORT(syscall_exit_work_partial) |
| SAVE_STATIC |
| syscall_exit_work: |
| li t0, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT |
| and t0, a2 # a2 is preloaded with TI_FLAGS |
| beqz t0, work_pending # trace bit set? |
| local_irq_enable # could let do_syscall_trace() |
| # call schedule() instead |
| move a0, sp |
| li a1, 1 |
| jal do_syscall_trace |
| b resume_userspace |
| |
| /* |
| * Common spurious interrupt handler. |
| */ |
| LEAF(spurious_interrupt) |
| /* |
| * Someone tried to fool us by sending an interrupt but we |
| * couldn't find a cause for it. |
| */ |
| PTR_LA t1, irq_err_count |
| #ifdef CONFIG_SMP |
| 1: ll t0, (t1) |
| addiu t0, 1 |
| sc t0, (t1) |
| #if R10000_LLSC_WAR |
| beqzl t0, 1b |
| #else |
| beqz t0, 1b |
| #endif |
| #else |
| lw t0, (t1) |
| addiu t0, 1 |
| sw t0, (t1) |
| #endif |
| j ret_from_irq |
| END(spurious_interrupt) |
