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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

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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
This commit is contained in:
Linus Torvalds
2012-12-12 12:22:13 -08:00
parent cf4af01221 541880d9a2
commit 9977d9b379
273 changed files with 1385 additions and 4231 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
arch/blackfin/Kconfig
View File

@@ -45,6 +45,8 @@ config BLACKFIN
select ARCH_USES_GETTIMEOFFSET if !GENERIC_CLOCKEVENTS
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select GENERIC_KERNEL_THREAD
select GENERIC_KERNEL_EXECVE
config GENERIC_CSUM
def_bool y

2
arch/blackfin/include/asm/processor.h
View File

@@ -75,8 +75,6 @@ static inline void release_thread(struct task_struct *dead_task)
{
}
extern int kernel_thread(int (*fn) (void *), void *arg, unsigned long flags);
/*
* Free current thread data structures etc..
*/

2
arch/blackfin/include/asm/unistd.h
View File

@@ -446,6 +446,8 @@
#define __ARCH_WANT_SYS_NICE
#define __ARCH_WANT_SYS_RT_SIGACTION
#define __ARCH_WANT_SYS_RT_SIGSUSPEND
#define __ARCH_WANT_SYS_EXECVE
#define __ARCH_WANT_SYS_VFORK
/*
* "Conditional" syscalls

55
arch/blackfin/kernel/entry.S
View File

@@ -46,53 +46,14 @@ ENTRY(_ret_from_fork)
SP += -12;
pseudo_long_call _schedule_tail, p5;
SP += 12;
r0 = [sp + PT_IPEND];
cc = bittst(r0,1);
if cc jump .Lin_kernel;
p1 = [sp++];
r0 = [sp++];
cc = p1 == 0;
if cc jump .Lfork;
sp += -12;
call (p1);
sp += 12;
.Lfork:
RESTORE_CONTEXT
rti;
.Lin_kernel:
bitclr(r0,1);
[sp + PT_IPEND] = r0;
/* do a 'fake' RTI by jumping to [RETI]
* to avoid clearing supervisor mode in child
*/
r0 = [sp + PT_PC];
[sp + PT_P0] = r0;
RESTORE_ALL_SYS
jump (p0);
ENDPROC(_ret_from_fork)
ENTRY(_sys_vfork)
r0 = sp;
r0 += 24;
[--sp] = rets;
SP += -12;
pseudo_long_call _bfin_vfork, p2;
SP += 12;
rets = [sp++];
rts;
ENDPROC(_sys_vfork)
ENTRY(_sys_clone)
r0 = sp;
r0 += 24;
[--sp] = rets;
SP += -12;
pseudo_long_call _bfin_clone, p2;
SP += 12;
rets = [sp++];
rts;
ENDPROC(_sys_clone)
ENTRY(_sys_rt_sigreturn)
r0 = sp;
r0 += 24;
[--sp] = rets;
SP += -12;
pseudo_long_call _do_rt_sigreturn, p2;
SP += 12;
rets = [sp++];
rts;
ENDPROC(_sys_rt_sigreturn)

98
arch/blackfin/kernel/process.c
View File

@@ -101,40 +101,6 @@ void cpu_idle(void)
}
}
/*
* This gets run with P1 containing the
* function to call, and R1 containing
* the "args". Note P0 is clobbered on the way here.
*/
void kernel_thread_helper(void);
__asm__(".section .text\n"
".align 4\n"
"_kernel_thread_helper:\n\t"
"\tsp += -12;\n\t"
"\tr0 = r1;\n\t" "\tcall (p1);\n\t" "\tcall _do_exit;\n" ".previous");
/*
* Create a kernel thread.
*/
pid_t kernel_thread(int (*fn) (void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.r1 = (unsigned long)arg;
regs.p1 = (unsigned long)fn;
regs.pc = (unsigned long)kernel_thread_helper;
regs.orig_p0 = -1;
/* Set bit 2 to tell ret_from_fork we should be returning to kernel
mode. */
regs.ipend = 0x8002;
__asm__ __volatile__("%0 = syscfg;":"=da"(regs.syscfg):);
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL,
NULL);
}
EXPORT_SYMBOL(kernel_thread);
/*
* Do necessary setup to start up a newly executed thread.
*
@@ -161,70 +127,48 @@ void flush_thread(void)
{
}
asmlinkage int bfin_vfork(struct pt_regs *regs)
asmlinkage int bfin_clone(unsigned long clone_flags, unsigned long newsp)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, rdusp(), regs, 0, NULL,
NULL);
}
asmlinkage int bfin_clone(struct pt_regs *regs)
{
unsigned long clone_flags;
unsigned long newsp;
#ifdef __ARCH_SYNC_CORE_DCACHE
if (current->nr_cpus_allowed == num_possible_cpus())
set_cpus_allowed_ptr(current, cpumask_of(smp_processor_id()));
#endif
/* syscall2 puts clone_flags in r0 and usp in r1 */
clone_flags = regs->r0;
newsp = regs->r1;
if (!newsp)
newsp = rdusp();
else
if (newsp)
newsp -= 12;
return do_fork(clone_flags, newsp, regs, 0, NULL, NULL);
return do_fork(clone_flags, newsp, 0, NULL, NULL);
}
int
copy_thread(unsigned long clone_flags,
unsigned long usp, unsigned long topstk,
struct task_struct *p, struct pt_regs *regs)
struct task_struct *p)
{
struct pt_regs *childregs;
unsigned long *v;
childregs = (struct pt_regs *) (task_stack_page(p) + THREAD_SIZE) - 1;
*childregs = *regs;
childregs->r0 = 0;
v = ((unsigned long *)childregs) - 2;
if (unlikely(p->flags & PF_KTHREAD)) {
memset(childregs, 0, sizeof(struct pt_regs));
v[0] = usp;
v[1] = topstk;
childregs->orig_p0 = -1;
childregs->ipend = 0x8000;
__asm__ __volatile__("%0 = syscfg;":"=da"(childregs->syscfg):);
p->thread.usp = 0;
} else {
*childregs = *current_pt_regs();
childregs->r0 = 0;
p->thread.usp = usp ? : rdusp();
v[0] = v[1] = 0;
}
p->thread.usp = usp;
p->thread.ksp = (unsigned long)childregs;
p->thread.ksp = (unsigned long)v;
p->thread.pc = (unsigned long)ret_from_fork;
return 0;
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(const char __user *name,
const char __user *const __user *argv,
const char __user *const __user *envp)
{
int error;
struct filename *filename;
struct pt_regs *regs = (struct pt_regs *)((&name) + 6);
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = do_execve(filename->name, argv, envp, regs);
putname(filename);
return error;
}
unsigned long get_wchan(struct task_struct *p)
{
unsigned long fp, pc;

4
arch/blackfin/kernel/signal.c
View File

@@ -82,9 +82,9 @@ rt_restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *p
return err;
}
asmlinkage int do_rt_sigreturn(unsigned long __unused)
asmlinkage int sys_rt_sigreturn(void)
{
struct pt_regs *regs = (struct pt_regs *)__unused;
struct pt_regs *regs = current_pt_regs();
unsigned long usp = rdusp();
struct rt_sigframe *frame = (struct rt_sigframe *)(usp);
sigset_t set;

57
arch/blackfin/mach-common/entry.S
View File

@@ -530,61 +530,6 @@ ENTRY(_trap) /* Exception: 4th entry into system event table(supervisor mode)*/
jump .Lsyscall_really_exit;
ENDPROC(_trap)
ENTRY(_kernel_execve)
link SIZEOF_PTREGS;
p0 = sp;
r3 = SIZEOF_PTREGS / 4;
r4 = 0(x);
.Lclear_regs:
[p0++] = r4;
r3 += -1;
cc = r3 == 0;
if !cc jump .Lclear_regs (bp);
p0 = sp;
sp += -16;
[sp + 12] = p0;
pseudo_long_call _do_execve, p5;
SP += 16;
cc = r0 == 0;
if ! cc jump .Lexecve_failed;
/* Success. Copy our temporary pt_regs to the top of the kernel
* stack and do a normal exception return.
*/
r1 = sp;
r0 = (-KERNEL_STACK_SIZE) (x);
r1 = r1 & r0;
p2 = r1;
p3 = [p2];
r0 = KERNEL_STACK_SIZE - 4 (z);
p1 = r0;
p1 = p1 + p2;
p0 = fp;
r4 = [p0--];
r3 = SIZEOF_PTREGS / 4;
.Lcopy_regs:
r4 = [p0--];
[p1--] = r4;
r3 += -1;
cc = r3 == 0;
if ! cc jump .Lcopy_regs (bp);
r0 = (KERNEL_STACK_SIZE - SIZEOF_PTREGS) (z);
p1 = r0;
p1 = p1 + p2;
sp = p1;
r0 = syscfg;
[SP + PT_SYSCFG] = r0;
[p3 + (TASK_THREAD + THREAD_KSP)] = sp;
RESTORE_CONTEXT;
rti;
.Lexecve_failed:
unlink;
rts;
ENDPROC(_kernel_execve)
ENTRY(_system_call)
/* Store IPEND */
p2.l = lo(IPEND);
@@ -1486,7 +1431,7 @@ ENTRY(_sys_call_table)
.long _sys_ni_syscall /* old sys_ipc */
.long _sys_fsync
.long _sys_ni_syscall /* old sys_sigreturn */
.long _sys_clone /* 120 */
.long _bfin_clone /* 120 */
.long _sys_setdomainname
.long _sys_newuname
.long _sys_ni_syscall /* old sys_modify_ldt */