diff options
Diffstat (limited to 'arch/mips/kernel/entry.S')
| -rw-r--r-- | arch/mips/kernel/entry.S | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S new file mode 100644 index 00000000000..5eb429137e0 --- /dev/null +++ b/arch/mips/kernel/entry.S @@ -0,0 +1,155 @@ +/* + * 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 reg=t0 + .endm +#else + .macro preempt_stop reg=t0 + local_irq_disable \reg + .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 + +FEXPORT(resume_userspace) + local_irq_disable t0 # make sure we dont miss an + # interrupt setting need_resched + # between sampling and return + LONG_L a2, TI_FLAGS($28) # current->work + andi a2, _TIF_WORK_MASK # (ignoring syscall_trace) + bnez a2, work_pending + j restore_all + +#ifdef CONFIG_PREEMPT +ENTRY(resume_kernel) + 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 + li t0, PREEMPT_ACTIVE + sw t0, TI_PRE_COUNT($28) + local_irq_enable t0 + jal schedule + sw zero, TI_PRE_COUNT($28) + local_irq_disable t0 + 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 + +FEXPORT(work_pending) + andi t0, a2, _TIF_NEED_RESCHED + beqz t0, work_notifysig +work_resched: + jal schedule + + local_irq_disable t0 # 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 restore_all + +FEXPORT(syscall_exit_work_partial) + SAVE_STATIC +FEXPORT(syscall_exit_work) + LONG_L t0, TI_FLAGS($28) + li t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT + and t0, t1 + beqz t0, work_pending # trace bit is 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. + */ + .text + .align 5 +LEAF(spurious_interrupt) + /* + * Someone tried to fool us by sending an interrupt but we + * couldn't find a cause for it. + */ +#ifdef CONFIG_SMP + lui t1, %hi(irq_err_count) +1: ll t0, %lo(irq_err_count)(t1) + addiu t0, 1 + sc t0, %lo(irq_err_count)(t1) +#if R10000_LLSC_WAR + beqzl t0, 1b +#else + beqz t0, 1b +#endif +#else + lui t1, %hi(irq_err_count) + lw t0, %lo(irq_err_count)(t1) + addiu t0, 1 + sw t0, %lo(irq_err_count)(t1) +#endif + j ret_from_irq + END(spurious_interrupt) |