9977d9b379
Pull big execve/kernel_thread/fork unification series from Al Viro:
"All architectures are converted to new model. Quite a bit of that
stuff is actually shared with architecture trees; in such cases it's
literally shared branch pulled by both, not a cherry-pick.
A lot of ugliness and black magic is gone (-3KLoC total in this one):
- kernel_thread()/kernel_execve()/sys_execve() redesign.
We don't do syscalls from kernel anymore for either kernel_thread()
or kernel_execve():
kernel_thread() is essentially clone(2) with callback run before we
return to userland, the callbacks either never return or do
successful do_execve() before returning.
kernel_execve() is a wrapper for do_execve() - it doesn't need to
do transition to user mode anymore.
As a result kernel_thread() and kernel_execve() are
arch-independent now - they live in kernel/fork.c and fs/exec.c
resp. sys_execve() is also in fs/exec.c and it's completely
architecture-independent.
- daemonize() is gone, along with its parts in fs/*.c
- struct pt_regs * is no longer passed to do_fork/copy_process/
copy_thread/do_execve/search_binary_handler/->load_binary/do_coredump.
- sys_fork()/sys_vfork()/sys_clone() unified; some architectures
still need wrappers (ones with callee-saved registers not saved in
pt_regs on syscall entry), but the main part of those suckers is in
kernel/fork.c now."
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (113 commits)
do_coredump(): get rid of pt_regs argument
print_fatal_signal(): get rid of pt_regs argument
ptrace_signal(): get rid of unused arguments
get rid of ptrace_signal_deliver() arguments
new helper: signal_pt_regs()
unify default ptrace_signal_deliver
flagday: kill pt_regs argument of do_fork()
death to idle_regs()
don't pass regs to copy_process()
flagday: don't pass regs to copy_thread()
bfin: switch to generic vfork, get rid of pointless wrappers
xtensa: switch to generic clone()
openrisc: switch to use of generic fork and clone
unicore32: switch to generic clone(2)
score: switch to generic fork/vfork/clone
c6x: sanitize copy_thread(), get rid of clone(2) wrapper, switch to generic clone()
take sys_fork/sys_vfork/sys_clone prototypes to linux/syscalls.h
mn10300: switch to generic fork/vfork/clone
h8300: switch to generic fork/vfork/clone
tile: switch to generic clone()
...
Conflicts:
arch/microblaze/include/asm/Kbuild
212 lines
4.9 KiB
ArmAsm
212 lines
4.9 KiB
ArmAsm
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Copyright (C) 2001 MIPS Technologies, Inc.
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*/
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#include <asm/asm.h>
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#include <asm/asmmacro.h>
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#include <asm/regdef.h>
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#include <asm/mipsregs.h>
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#include <asm/stackframe.h>
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#include <asm/isadep.h>
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#include <asm/thread_info.h>
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#include <asm/war.h>
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#ifdef CONFIG_MIPS_MT_SMTC
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#include <asm/mipsmtregs.h>
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#endif
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#ifndef CONFIG_PREEMPT
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#define resume_kernel restore_all
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#else
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#define __ret_from_irq ret_from_exception
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#endif
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.text
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.align 5
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#ifndef CONFIG_PREEMPT
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FEXPORT(ret_from_exception)
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local_irq_disable # preempt stop
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b __ret_from_irq
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#endif
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FEXPORT(ret_from_irq)
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LONG_S s0, TI_REGS($28)
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FEXPORT(__ret_from_irq)
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/*
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* We can be coming here from a syscall done in the kernel space,
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* e.g. a failed kernel_execve().
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*/
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resume_userspace_check:
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LONG_L t0, PT_STATUS(sp) # returning to kernel mode?
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andi t0, t0, KU_USER
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beqz t0, resume_kernel
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resume_userspace:
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local_irq_disable # make sure we dont miss an
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# interrupt setting need_resched
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# between sampling and return
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LONG_L a2, TI_FLAGS($28) # current->work
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andi t0, a2, _TIF_WORK_MASK # (ignoring syscall_trace)
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bnez t0, work_pending
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j restore_all
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#ifdef CONFIG_PREEMPT
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resume_kernel:
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local_irq_disable
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lw t0, TI_PRE_COUNT($28)
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bnez t0, restore_all
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need_resched:
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LONG_L t0, TI_FLAGS($28)
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andi t1, t0, _TIF_NEED_RESCHED
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beqz t1, restore_all
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LONG_L t0, PT_STATUS(sp) # Interrupts off?
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andi t0, 1
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beqz t0, restore_all
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jal preempt_schedule_irq
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b need_resched
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#endif
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FEXPORT(ret_from_kernel_thread)
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jal schedule_tail # a0 = struct task_struct *prev
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move a0, s1
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jal s0
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j syscall_exit
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FEXPORT(ret_from_fork)
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jal schedule_tail # a0 = struct task_struct *prev
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FEXPORT(syscall_exit)
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local_irq_disable # make sure need_resched and
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# signals dont change between
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# sampling and return
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LONG_L a2, TI_FLAGS($28) # current->work
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li t0, _TIF_ALLWORK_MASK
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and t0, a2, t0
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bnez t0, syscall_exit_work
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restore_all: # restore full frame
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#ifdef CONFIG_MIPS_MT_SMTC
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#ifdef CONFIG_MIPS_MT_SMTC_IM_BACKSTOP
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/* Re-arm any temporarily masked interrupts not explicitly "acked" */
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mfc0 v0, CP0_TCSTATUS
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ori v1, v0, TCSTATUS_IXMT
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mtc0 v1, CP0_TCSTATUS
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andi v0, TCSTATUS_IXMT
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_ehb
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mfc0 t0, CP0_TCCONTEXT
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DMT 9 # dmt t1
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jal mips_ihb
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mfc0 t2, CP0_STATUS
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andi t3, t0, 0xff00
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or t2, t2, t3
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mtc0 t2, CP0_STATUS
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_ehb
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andi t1, t1, VPECONTROL_TE
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beqz t1, 1f
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EMT
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1:
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mfc0 v1, CP0_TCSTATUS
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/* We set IXMT above, XOR should clear it here */
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xori v1, v1, TCSTATUS_IXMT
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or v1, v0, v1
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mtc0 v1, CP0_TCSTATUS
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_ehb
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xor t0, t0, t3
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mtc0 t0, CP0_TCCONTEXT
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#endif /* CONFIG_MIPS_MT_SMTC_IM_BACKSTOP */
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/* Detect and execute deferred IPI "interrupts" */
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LONG_L s0, TI_REGS($28)
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LONG_S sp, TI_REGS($28)
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jal deferred_smtc_ipi
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LONG_S s0, TI_REGS($28)
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#endif /* CONFIG_MIPS_MT_SMTC */
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.set noat
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RESTORE_TEMP
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RESTORE_AT
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RESTORE_STATIC
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restore_partial: # restore partial frame
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#ifdef CONFIG_TRACE_IRQFLAGS
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SAVE_STATIC
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SAVE_AT
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SAVE_TEMP
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LONG_L v0, PT_STATUS(sp)
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#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
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and v0, ST0_IEP
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#else
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and v0, ST0_IE
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#endif
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beqz v0, 1f
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jal trace_hardirqs_on
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b 2f
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1: jal trace_hardirqs_off
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2:
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RESTORE_TEMP
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RESTORE_AT
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RESTORE_STATIC
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#endif
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RESTORE_SOME
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RESTORE_SP_AND_RET
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.set at
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work_pending:
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andi t0, a2, _TIF_NEED_RESCHED # a2 is preloaded with TI_FLAGS
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beqz t0, work_notifysig
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work_resched:
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jal schedule
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local_irq_disable # make sure need_resched and
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# signals dont change between
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# sampling and return
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LONG_L a2, TI_FLAGS($28)
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andi t0, a2, _TIF_WORK_MASK # is there any work to be done
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# other than syscall tracing?
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beqz t0, restore_all
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andi t0, a2, _TIF_NEED_RESCHED
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bnez t0, work_resched
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work_notifysig: # deal with pending signals and
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# notify-resume requests
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move a0, sp
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li a1, 0
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jal do_notify_resume # a2 already loaded
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j resume_userspace_check
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FEXPORT(syscall_exit_partial)
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local_irq_disable # make sure need_resched doesn't
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# change between and return
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LONG_L a2, TI_FLAGS($28) # current->work
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li t0, _TIF_ALLWORK_MASK
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and t0, a2
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beqz t0, restore_partial
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SAVE_STATIC
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syscall_exit_work:
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LONG_L t0, PT_STATUS(sp) # returning to kernel mode?
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andi t0, t0, KU_USER
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beqz t0, resume_kernel
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li t0, _TIF_WORK_SYSCALL_EXIT
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and t0, a2 # a2 is preloaded with TI_FLAGS
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beqz t0, work_pending # trace bit set?
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local_irq_enable # could let syscall_trace_leave()
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# call schedule() instead
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move a0, sp
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jal syscall_trace_leave
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b resume_userspace
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#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_MIPS_MT)
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/*
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* MIPS32R2 Instruction Hazard Barrier - must be called
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*
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* For C code use the inline version named instruction_hazard().
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*/
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LEAF(mips_ihb)
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.set mips32r2
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jr.hb ra
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nop
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END(mips_ihb)
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#endif /* CONFIG_CPU_MIPSR2 or CONFIG_MIPS_MT */
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