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authorLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 21:22:13 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-12 21:22:13 +0100
commit9977d9b379cb77e0f67bd6f4563618106e58e11d (patch)
tree0191accfddf578edb52c69c933d64521e3dce297 /arch/sh/kernel/process_32.c
parentMerge tag 'boards' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc (diff)
parentdo_coredump(): get rid of pt_regs argument (diff)
downloadlinux-9977d9b379cb77e0f67bd6f4563618106e58e11d.tar.xz
linux-9977d9b379cb77e0f67bd6f4563618106e58e11d.zip
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/sh/kernel/process_32.c')
-rw-r--r--arch/sh/kernel/process_32.c134
1 files changed, 20 insertions, 114 deletions
diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c
index ba7345f37bc9..73eb66fc6253 100644
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@ -68,38 +68,6 @@ void show_regs(struct pt_regs * regs)
show_code(regs);
}
-/*
- * Create a kernel thread
- */
-__noreturn void kernel_thread_helper(void *arg, int (*fn)(void *))
-{
- do_exit(fn(arg));
-}
-
-/* Don't use this in BL=1(cli). Or else, CPU resets! */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- struct pt_regs regs;
- int pid;
-
- memset(&regs, 0, sizeof(regs));
- regs.regs[4] = (unsigned long)arg;
- regs.regs[5] = (unsigned long)fn;
-
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.sr = SR_MD;
-#if defined(CONFIG_SH_FPU)
- regs.sr |= SR_FD;
-#endif
-
- /* Ok, create the new process.. */
- pid = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
- &regs, 0, NULL, NULL);
-
- return pid;
-}
-EXPORT_SYMBOL(kernel_thread);
-
void start_thread(struct pt_regs *regs, unsigned long new_pc,
unsigned long new_sp)
{
@@ -157,10 +125,10 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
EXPORT_SYMBOL(dump_fpu);
asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
int copy_thread(unsigned long clone_flags, unsigned long usp,
- unsigned long unused,
- struct task_struct *p, struct pt_regs *regs)
+ unsigned long arg, struct task_struct *p)
{
struct thread_info *ti = task_thread_info(p);
struct pt_regs *childregs;
@@ -177,29 +145,35 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
}
#endif
- childregs = task_pt_regs(p);
- *childregs = *regs;
+ memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
- if (user_mode(regs)) {
- childregs->regs[15] = usp;
- ti->addr_limit = USER_DS;
- } else {
- childregs->regs[15] = (unsigned long)childregs;
+ childregs = task_pt_regs(p);
+ p->thread.sp = (unsigned long) childregs;
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ p->thread.pc = (unsigned long) ret_from_kernel_thread;
+ childregs->regs[4] = arg;
+ childregs->regs[5] = usp;
+ childregs->sr = SR_MD;
+#if defined(CONFIG_SH_FPU)
+ childregs->sr |= SR_FD;
+#endif
ti->addr_limit = KERNEL_DS;
ti->status &= ~TS_USEDFPU;
p->fpu_counter = 0;
+ return 0;
}
+ *childregs = *current_pt_regs();
+
+ if (usp)
+ childregs->regs[15] = usp;
+ ti->addr_limit = USER_DS;
if (clone_flags & CLONE_SETTLS)
childregs->gbr = childregs->regs[0];
childregs->regs[0] = 0; /* Set return value for child */
-
- p->thread.sp = (unsigned long) childregs;
p->thread.pc = (unsigned long) ret_from_fork;
-
- memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
-
return 0;
}
@@ -243,74 +217,6 @@ __switch_to(struct task_struct *prev, struct task_struct *next)
return prev;
}
-asmlinkage int sys_fork(unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs __regs)
-{
-#ifdef CONFIG_MMU
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
- return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL);
-#else
- /* fork almost works, enough to trick you into looking elsewhere :-( */
- return -EINVAL;
-#endif
-}
-
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
- unsigned long parent_tidptr,
- unsigned long child_tidptr,
- struct pt_regs __regs)
-{
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
- if (!newsp)
- newsp = regs->regs[15];
- return do_fork(clone_flags, newsp, regs, 0,
- (int __user *)parent_tidptr,
- (int __user *)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.
- */
-asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs __regs)
-{
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs,
- 0, NULL, NULL);
-}
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char __user *ufilename,
- const char __user *const __user *uargv,
- const char __user *const __user *uenvp,
- unsigned long r7, struct pt_regs __regs)
-{
- struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
- int error;
- struct filename *filename;
-
- filename = getname(ufilename);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
-
- error = do_execve(filename->name, uargv, uenvp, regs);
- putname(filename);
-out:
- return error;
-}
-
unsigned long get_wchan(struct task_struct *p)
{
unsigned long pc;