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authorLinus Torvalds <torvalds@linux-foundation.org>2012-12-13 00:22:13 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-13 00:22:13 +0400
commit9977d9b379cb77e0f67bd6f4563618106e58e11d (patch)
tree0191accfddf578edb52c69c933d64521e3dce297 /arch/m68k
parentcf4af01221579a4e895f43dbfc47598fbfc5a731 (diff)
parent541880d9a2c7871f6370071d55aa6662d329c51e (diff)
downloadlinux-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/m68k')
-rw-r--r--arch/m68k/Kconfig1
-rw-r--r--arch/m68k/include/asm/signal.h8
-rw-r--r--arch/m68k/include/asm/unistd.h3
-rw-r--r--arch/m68k/kernel/entry.S30
-rw-r--r--arch/m68k/kernel/process.c87
-rw-r--r--arch/m68k/kernel/signal.c3
-rw-r--r--arch/m68k/kernel/syscalltable.S6
7 files changed, 52 insertions, 86 deletions
diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index e7c161433eae..953a7ba5d050 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -16,6 +16,7 @@ config M68K
select ARCH_WANT_IPC_PARSE_VERSION
select ARCH_USES_GETTIMEOFFSET if MMU && !COLDFIRE
select GENERIC_KERNEL_THREAD
+ select GENERIC_KERNEL_EXECVE
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_REL
select MODULES_USE_ELF_RELA
diff --git a/arch/m68k/include/asm/signal.h b/arch/m68k/include/asm/signal.h
index 2df26b57c26a..9c8c46b06b0c 100644
--- a/arch/m68k/include/asm/signal.h
+++ b/arch/m68k/include/asm/signal.h
@@ -86,11 +86,9 @@ static inline int sigfindinword(unsigned long word)
#endif /* !CONFIG_CPU_HAS_NO_BITFIELDS */
-#ifdef __uClinux__
-#define ptrace_signal_deliver(regs, cookie) do { } while (0)
-#else
-struct pt_regs;
-extern void ptrace_signal_deliver(struct pt_regs *regs, void *cookie);
+#ifndef __uClinux__
+extern void ptrace_signal_deliver(void);
+#define ptrace_signal_deliver ptrace_signal_deliver
#endif /* __uClinux__ */
#endif /* _M68K_SIGNAL_H */
diff --git a/arch/m68k/include/asm/unistd.h b/arch/m68k/include/asm/unistd.h
index 5fc7f7bec1c8..a021d67cdd72 100644
--- a/arch/m68k/include/asm/unistd.h
+++ b/arch/m68k/include/asm/unistd.h
@@ -32,7 +32,8 @@
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
-#define __ARCH_WANT_KERNEL_EXECVE
+#define __ARCH_WANT_SYS_FORK
+#define __ARCH_WANT_SYS_VFORK
/*
* "Conditional" syscalls
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index 946cb0187751..a78f5649e8de 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -44,34 +44,29 @@
.globl system_call, buserr, trap, resume
.globl sys_call_table
-.globl sys_fork, sys_clone, sys_vfork
+.globl __sys_fork, __sys_clone, __sys_vfork
.globl ret_from_interrupt, bad_interrupt
.globl auto_irqhandler_fixup
.globl user_irqvec_fixup
.text
-ENTRY(sys_fork)
+ENTRY(__sys_fork)
SAVE_SWITCH_STACK
- pea %sp@(SWITCH_STACK_SIZE)
- jbsr m68k_fork
- addql #4,%sp
- RESTORE_SWITCH_STACK
+ jbsr sys_fork
+ lea %sp@(24),%sp
rts
-ENTRY(sys_clone)
+ENTRY(__sys_clone)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr m68k_clone
- addql #4,%sp
- RESTORE_SWITCH_STACK
+ lea %sp@(28),%sp
rts
-ENTRY(sys_vfork)
+ENTRY(__sys_vfork)
SAVE_SWITCH_STACK
- pea %sp@(SWITCH_STACK_SIZE)
- jbsr m68k_vfork
- addql #4,%sp
- RESTORE_SWITCH_STACK
+ jbsr sys_vfork
+ lea %sp@(24),%sp
rts
ENTRY(sys_sigreturn)
@@ -115,16 +110,9 @@ ENTRY(ret_from_kernel_thread)
| a3 contains the kernel thread payload, d7 - its argument
movel %d1,%sp@-
jsr schedule_tail
- GET_CURRENT(%d0)
movel %d7,(%sp)
jsr %a3@
addql #4,%sp
- movel %d0,(%sp)
- jra sys_exit
-
-ENTRY(ret_from_kernel_execve)
- movel 4(%sp), %sp
- GET_CURRENT(%d0)
jra ret_from_exception
#if defined(CONFIG_COLDFIRE) || !defined(CONFIG_MMU)
diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index c51bb172e14d..d538694ad208 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -136,57 +136,35 @@ void flush_thread(void)
}
/*
- * "m68k_fork()".. By the time we get here, the
- * non-volatile registers have also been saved on the
- * stack. We do some ugly pointer stuff here.. (see
- * also copy_thread)
+ * Why not generic sys_clone, you ask? m68k passes all arguments on stack.
+ * And we need all registers saved, which means a bunch of stuff pushed
+ * on top of pt_regs, which means that sys_clone() arguments would be
+ * buried. We could, of course, copy them, but it's too costly for no
+ * good reason - generic clone() would have to copy them *again* for
+ * do_fork() anyway. So in this case it's actually better to pass pt_regs *
+ * and extract arguments for do_fork() from there. Eventually we might
+ * go for calling do_fork() directly from the wrapper, but only after we
+ * are finished with do_fork() prototype conversion.
*/
-
-asmlinkage int m68k_fork(struct pt_regs *regs)
-{
-#ifdef CONFIG_MMU
- return do_fork(SIGCHLD, rdusp(), regs, 0, NULL, NULL);
-#else
- return -EINVAL;
-#endif
-}
-
-asmlinkage int m68k_vfork(struct pt_regs *regs)
-{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0,
- NULL, NULL);
-}
-
asmlinkage int m68k_clone(struct pt_regs *regs)
{
- unsigned long clone_flags;
- unsigned long newsp;
- int __user *parent_tidptr, *child_tidptr;
-
- /* syscall2 puts clone_flags in d1 and usp in d2 */
- clone_flags = regs->d1;
- newsp = regs->d2;
- parent_tidptr = (int __user *)regs->d3;
- child_tidptr = (int __user *)regs->d4;
- if (!newsp)
- newsp = rdusp();
- return do_fork(clone_flags, newsp, regs, 0,
- parent_tidptr, child_tidptr);
+ /* regs will be equal to current_pt_regs() */
+ return do_fork(regs->d1, regs->d2, 0,
+ (int __user *)regs->d3, (int __user *)regs->d4);
}
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long arg,
- struct task_struct * p, struct pt_regs * regs)
+ unsigned long arg, struct task_struct *p)
{
- struct pt_regs * childregs;
- struct switch_stack *childstack;
+ struct fork_frame {
+ struct switch_stack sw;
+ struct pt_regs regs;
+ } *frame;
- childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
- childstack = ((struct switch_stack *) childregs) - 1;
+ frame = (struct fork_frame *) (task_stack_page(p) + THREAD_SIZE) - 1;
- p->thread.usp = usp;
- p->thread.ksp = (unsigned long)childstack;
- p->thread.esp0 = (unsigned long)childregs;
+ p->thread.ksp = (unsigned long)frame;
+ p->thread.esp0 = (unsigned long)&frame->regs;
/*
* Must save the current SFC/DFC value, NOT the value when
@@ -194,25 +172,24 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
*/
p->thread.fs = get_fs().seg;
- if (unlikely(!regs)) {
+ if (unlikely(p->flags & PF_KTHREAD)) {
/* kernel thread */
- memset(childstack, 0,
- sizeof(struct switch_stack) + sizeof(struct pt_regs));
- childregs->sr = PS_S;
- childstack->a3 = usp; /* function */
- childstack->d7 = arg;
- childstack->retpc = (unsigned long)ret_from_kernel_thread;
+ memset(frame, 0, sizeof(struct fork_frame));
+ frame->regs.sr = PS_S;
+ frame->sw.a3 = usp; /* function */
+ frame->sw.d7 = arg;
+ frame->sw.retpc = (unsigned long)ret_from_kernel_thread;
p->thread.usp = 0;
return 0;
}
- *childregs = *regs;
- childregs->d0 = 0;
-
- *childstack = ((struct switch_stack *) regs)[-1];
- childstack->retpc = (unsigned long)ret_from_fork;
+ memcpy(frame, container_of(current_pt_regs(), struct fork_frame, regs),
+ sizeof(struct fork_frame));
+ frame->regs.d0 = 0;
+ frame->sw.retpc = (unsigned long)ret_from_fork;
+ p->thread.usp = usp ?: rdusp();
if (clone_flags & CLONE_SETTLS)
- task_thread_info(p)->tp_value = regs->d5;
+ task_thread_info(p)->tp_value = frame->regs.d5;
#ifdef CONFIG_FPU
if (!FPU_IS_EMU) {
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index 710a528b928b..9a396cda3147 100644
--- a/arch/m68k/kernel/signal.c
+++ b/arch/m68k/kernel/signal.c
@@ -108,8 +108,9 @@ int handle_kernel_fault(struct pt_regs *regs)
return 1;
}
-void ptrace_signal_deliver(struct pt_regs *regs, void *cookie)
+void ptrace_signal_deliver(void)
{
+ struct pt_regs *regs = signal_pt_regs();
if (regs->orig_d0 < 0)
return;
switch (regs->d0) {
diff --git a/arch/m68k/kernel/syscalltable.S b/arch/m68k/kernel/syscalltable.S
index 4fc2e29b771b..c30da5b3f2db 100644
--- a/arch/m68k/kernel/syscalltable.S
+++ b/arch/m68k/kernel/syscalltable.S
@@ -22,7 +22,7 @@ ALIGN
ENTRY(sys_call_table)
.long sys_restart_syscall /* 0 - old "setup()" system call, used for restarting */
.long sys_exit
- .long sys_fork
+ .long __sys_fork
.long sys_read
.long sys_write
.long sys_open /* 5 */
@@ -140,7 +140,7 @@ ENTRY(sys_call_table)
.long sys_ipc
.long sys_fsync
.long sys_sigreturn
- .long sys_clone /* 120 */
+ .long __sys_clone /* 120 */
.long sys_setdomainname
.long sys_newuname
.long sys_cacheflush /* modify_ldt for i386 */
@@ -210,7 +210,7 @@ ENTRY(sys_call_table)
.long sys_sendfile
.long sys_ni_syscall /* streams1 */
.long sys_ni_syscall /* streams2 */
- .long sys_vfork /* 190 */
+ .long __sys_vfork /* 190 */
.long sys_getrlimit
.long sys_mmap2
.long sys_truncate64