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author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-12 20:22:13 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-12 20:22:13 (GMT) |
commit | 9977d9b379cb77e0f67bd6f4563618106e58e11d (patch) | |
tree | 0191accfddf578edb52c69c933d64521e3dce297 /arch/s390/kernel | |
parent | cf4af01221579a4e895f43dbfc47598fbfc5a731 (diff) | |
parent | 541880d9a2c7871f6370071d55aa6662d329c51e (diff) | |
download | linux-fsl-qoriq-9977d9b379cb77e0f67bd6f4563618106e58e11d.tar.xz |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal
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
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r-- | arch/s390/kernel/entry.S | 32 | ||||
-rw-r--r-- | arch/s390/kernel/entry.h | 4 | ||||
-rw-r--r-- | arch/s390/kernel/entry64.S | 26 | ||||
-rw-r--r-- | arch/s390/kernel/process.c | 53 |
4 files changed, 20 insertions, 95 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index ef46f66..aa8f2ba 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -330,40 +330,18 @@ ENTRY(ret_from_fork) la %r11,STACK_FRAME_OVERHEAD(%r15) l %r12,__LC_THREAD_INFO l %r13,__LC_SVC_NEW_PSW+4 - tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? - je 1f l %r1,BASED(.Lschedule_tail) basr %r14,%r1 # call schedule_tail TRACE_IRQS_ON ssm __LC_SVC_NEW_PSW # reenable interrupts - j sysc_tracenogo - -1: # it's a kernel thread - st %r15,__PT_R15(%r11) # store stack pointer for new kthread - l %r1,BASED(.Lschedule_tail) - basr %r14,%r1 # call schedule_tail - TRACE_IRQS_ON - ssm __LC_SVC_NEW_PSW # reenable interrupts - lm %r9,%r11,__PT_R9(%r11) # load gprs + tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? + jne sysc_tracenogo + # it's a kernel thread + lm %r9,%r10,__PT_R9(%r11) # load gprs ENTRY(kernel_thread_starter) la %r2,0(%r10) basr %r14,%r9 - la %r2,0 - br %r11 # do_exit - -# -# kernel_execve function needs to deal with pt_regs that is not -# at the usual place -# -ENTRY(ret_from_kernel_execve) - ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts - lr %r15,%r2 - lr %r11,%r2 - ahi %r15,-STACK_FRAME_OVERHEAD - xc __SF_BACKCHAIN(4,%r15),__SF_BACKCHAIN(%r15) - l %r12,__LC_THREAD_INFO - ssm __LC_SVC_NEW_PSW # reenable interrupts - j sysc_return + j sysc_tracenogo /* * Program check handler routine diff --git a/arch/s390/kernel/entry.h b/arch/s390/kernel/entry.h index d0d3f69..d8251b9 100644 --- a/arch/s390/kernel/entry.h +++ b/arch/s390/kernel/entry.h @@ -54,10 +54,6 @@ long sys_s390_fadvise64(int fd, u32 offset_high, u32 offset_low, long sys_s390_fadvise64_64(struct fadvise64_64_args __user *args); long sys_s390_fallocate(int fd, int mode, loff_t offset, u32 len_high, u32 len_low); -long sys_fork(void); -long sys_clone(unsigned long newsp, unsigned long clone_flags, - int __user *parent_tidptr, int __user *child_tidptr); -long sys_vfork(void); long sys_sigsuspend(int history0, int history1, old_sigset_t mask); long sys_sigaction(int sig, const struct old_sigaction __user *act, struct old_sigaction __user *oact); diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 07d8de3..499e95e 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -352,33 +352,17 @@ sysc_tracenogo: ENTRY(ret_from_fork) la %r11,STACK_FRAME_OVERHEAD(%r15) lg %r12,__LC_THREAD_INFO - tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? - je 1f brasl %r14,schedule_tail TRACE_IRQS_ON ssm __LC_SVC_NEW_PSW # reenable interrupts - j sysc_tracenogo -1: # it's a kernel thread - stg %r15,__PT_R15(%r11) # store stack pointer for new kthread - brasl %r14,schedule_tail - TRACE_IRQS_ON - ssm __LC_SVC_NEW_PSW # reenable interrupts - lmg %r9,%r11,__PT_R9(%r11) # load gprs + tm __PT_PSW+1(%r11),0x01 # forking a kernel thread ? + jne sysc_tracenogo + # it's a kernel thread + lmg %r9,%r10,__PT_R9(%r11) # load gprs ENTRY(kernel_thread_starter) la %r2,0(%r10) basr %r14,%r9 - la %r2,0 - br %r11 # do_exit - -ENTRY(ret_from_kernel_execve) - ssm __LC_PGM_NEW_PSW # disable I/O and ext. interrupts - lgr %r15,%r2 - lgr %r11,%r2 - aghi %r15,-STACK_FRAME_OVERHEAD - xc __SF_BACKCHAIN(8,%r15),__SF_BACKCHAIN(%r15) - lg %r12,__LC_THREAD_INFO - ssm __LC_SVC_NEW_PSW # reenable interrupts - j sysc_return + j sysc_tracenogo /* * Program check handler routine diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index cd31ad4..536d645 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -117,8 +117,7 @@ void release_thread(struct task_struct *dead_task) } int copy_thread(unsigned long clone_flags, unsigned long new_stackp, - unsigned long arg, - struct task_struct *p, struct pt_regs *regs) + unsigned long arg, struct task_struct *p) { struct thread_info *ti; struct fake_frame @@ -150,7 +149,7 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp, frame->sf.gprs[9] = (unsigned long) frame; /* Store access registers to kernel stack of new process. */ - if (unlikely(!regs)) { + if (unlikely(p->flags & PF_KTHREAD)) { /* kernel thread */ memset(&frame->childregs, 0, sizeof(struct pt_regs)); frame->childregs.psw.mask = psw_kernel_bits | PSW_MASK_DAT | @@ -164,9 +163,10 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp, return 0; } - frame->childregs = *regs; + frame->childregs = *current_pt_regs(); frame->childregs.gprs[2] = 0; /* child returns 0 on fork. */ - frame->childregs.gprs[15] = new_stackp; + if (new_stackp) + frame->childregs.gprs[15] = new_stackp; /* Don't copy runtime instrumentation info */ p->thread.ri_cb = NULL; @@ -183,57 +183,24 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp, sizeof(s390_fp_regs)); /* Set a new TLS ? */ if (clone_flags & CLONE_SETTLS) - p->thread.acrs[0] = regs->gprs[6]; + p->thread.acrs[0] = frame->childregs.gprs[6]; #else /* CONFIG_64BIT */ /* Save the fpu registers to new thread structure. */ save_fp_regs(&p->thread.fp_regs); /* Set a new TLS ? */ if (clone_flags & CLONE_SETTLS) { + unsigned long tls = frame->childregs.gprs[6]; if (is_compat_task()) { - p->thread.acrs[0] = (unsigned int) regs->gprs[6]; + p->thread.acrs[0] = (unsigned int)tls; } else { - p->thread.acrs[0] = (unsigned int)(regs->gprs[6] >> 32); - p->thread.acrs[1] = (unsigned int) regs->gprs[6]; + p->thread.acrs[0] = (unsigned int)(tls >> 32); + p->thread.acrs[1] = (unsigned int)tls; } } #endif /* CONFIG_64BIT */ return 0; } -SYSCALL_DEFINE0(fork) -{ - struct pt_regs *regs = task_pt_regs(current); - return do_fork(SIGCHLD, regs->gprs[15], regs, 0, NULL, NULL); -} - -SYSCALL_DEFINE4(clone, unsigned long, newsp, unsigned long, clone_flags, - int __user *, parent_tidptr, int __user *, child_tidptr) -{ - struct pt_regs *regs = task_pt_regs(current); - - if (!newsp) - newsp = regs->gprs[15]; - return do_fork(clone_flags, newsp, regs, 0, - parent_tidptr, child_tidptr); -} - -/* - * This is trivial, and on the face of it looks like it - * could equally well be done in user mode. - * - * Not so, for quite unobvious reasons - register pressure. - * In user mode vfork() cannot have a stack frame, and if - * done by calling the "clone()" system call directly, you - * do not have enough call-clobbered registers to hold all - * the information you need. - */ -SYSCALL_DEFINE0(vfork) -{ - struct pt_regs *regs = task_pt_regs(current); - return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, - regs->gprs[15], regs, 0, NULL, NULL); -} - asmlinkage void execve_tail(void) { current->thread.fp_regs.fpc = 0; |