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

ソースを参照 
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
このコミットが含まれているのは:
Linus Torvalds
2012-12-12 12:22:13 -08:00
親 cf4af01221 541880d9a2
コミット 9977d9b379
273個のファイルの変更、1385行の追加、4231行の削除
Patchファイルをダウンロード Diffファイルをダウンロード すべてのファイルを展開 すべてのファイルを折り畳む

6
arch/mips/kernel/entry.S
ファイルの表示

@@ -70,6 +70,12 @@ need_resched:
b need_resched
#endif
FEXPORT(ret_from_kernel_thread)
jal schedule_tail # a0 = struct task_struct *prev
move a0, s1
jal s0
j syscall_exit
FEXPORT(ret_from_fork)
jal schedule_tail # a0 = struct task_struct *prev

23
arch/mips/kernel/linux32.c
ファイルの表示

@@ -3,7 +3,6 @@
*
* Copyright (C) 2000 Silicon Graphics, Inc.
* Written by Ulf Carlsson (ulfc@engr.sgi.com)
* sys32_execve from ia64/ia32 code, Feb 2000, Kanoj Sarcar (kanoj@sgi.com)
*/
#include <linux/compiler.h>
#include <linux/mm.h>
@@ -77,26 +76,6 @@ out:
return error;
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys32_execve(nabi_no_regargs struct pt_regs regs)
{
int error;
struct filename *filename;
filename = getname(compat_ptr(regs.regs[4]));
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = compat_do_execve(filename->name, compat_ptr(regs.regs[5]),
compat_ptr(regs.regs[6]), &regs);
putname(filename);
out:
return error;
}
#define RLIM_INFINITY32 0x7fffffff
#define RESOURCE32(x) ((x > RLIM_INFINITY32) ? RLIM_INFINITY32 : x)
@@ -333,7 +312,7 @@ _sys32_clone(nabi_no_regargs struct pt_regs regs)
/* Use __dummy4 instead of getting it off the stack, so that
syscall() works. */
child_tidptr = (int __user *) __dummy4;
return do_fork(clone_flags, newsp, &regs, 0,
return do_fork(clone_flags, newsp, 0,
parent_tidptr, child_tidptr);
}

2
arch/mips/kernel/mips_ksyms.c
ファイルの表示

@@ -32,8 +32,6 @@ EXPORT_SYMBOL(memset);
EXPORT_SYMBOL(memcpy);
EXPORT_SYMBOL(memmove);
EXPORT_SYMBOL(kernel_thread);
/*
* Functions that operate on entire pages. Mostly used by memory management.
*/

64
arch/mips/kernel/process.c
ファイルの表示

@@ -84,6 +84,7 @@ void __noreturn cpu_idle(void)
}
asmlinkage void ret_from_fork(void);
asmlinkage void ret_from_kernel_thread(void);
void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
{
@@ -113,10 +114,10 @@ void flush_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;
struct pt_regs *childregs, *regs = current_pt_regs();
unsigned long childksp;
p->set_child_tid = p->clear_child_tid = NULL;
@@ -136,19 +137,30 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
childregs = (struct pt_regs *) childksp - 1;
/* Put the stack after the struct pt_regs. */
childksp = (unsigned long) childregs;
p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1);
if (unlikely(p->flags & PF_KTHREAD)) {
unsigned long status = p->thread.cp0_status;
memset(childregs, 0, sizeof(struct pt_regs));
ti->addr_limit = KERNEL_DS;
p->thread.reg16 = usp; /* fn */
p->thread.reg17 = arg;
p->thread.reg29 = childksp;
p->thread.reg31 = (unsigned long) ret_from_kernel_thread;
#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
status = (status & ~(ST0_KUP | ST0_IEP | ST0_IEC)) |
((status & (ST0_KUC | ST0_IEC)) << 2);
#else
status |= ST0_EXL;
#endif
childregs->cp0_status = status;
return 0;
}
*childregs = *regs;
childregs->regs[7] = 0; /* Clear error flag */
childregs->regs[2] = 0; /* Child gets zero as return value */
childregs->regs[29] = usp;
ti->addr_limit = USER_DS;
if (childregs->cp0_status & ST0_CU0) {
childregs->regs[28] = (unsigned long) ti;
childregs->regs[29] = childksp;
ti->addr_limit = KERNEL_DS;
} else {
childregs->regs[29] = usp;
ti->addr_limit = USER_DS;
}
p->thread.reg29 = (unsigned long) childregs;
p->thread.reg31 = (unsigned long) ret_from_fork;
@@ -156,7 +168,6 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
* New tasks lose permission to use the fpu. This accelerates context
* switching for most programs since they don't use the fpu.
*/
p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1);
childregs->cp0_status &= ~(ST0_CU2|ST0_CU1);
#ifdef CONFIG_MIPS_MT_SMTC
@@ -221,35 +232,6 @@ int dump_task_fpu(struct task_struct *t, elf_fpregset_t *fpr)
return 1;
}
/*
* Create a kernel thread
*/
static void __noreturn kernel_thread_helper(void *arg, int (*fn)(void *))
{
do_exit(fn(arg));
}
long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
{
struct pt_regs regs;
memset(&regs, 0, sizeof(regs));
regs.regs[4] = (unsigned long) arg;
regs.regs[5] = (unsigned long) fn;
regs.cp0_epc = (unsigned long) kernel_thread_helper;
regs.cp0_status = read_c0_status();
#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
regs.cp0_status = (regs.cp0_status & ~(ST0_KUP | ST0_IEP | ST0_IEC)) |
((regs.cp0_status & (ST0_KUC | ST0_IEC)) << 2);
#else
regs.cp0_status |= ST0_EXL;
#endif
/* Ok, create the new process.. */
return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
}
/*
*
*/

2
arch/mips/kernel/scall64-n32.S
ファイルの表示

@@ -167,7 +167,7 @@ EXPORT(sysn32_call_table)
PTR sys_getsockopt
PTR sys_clone /* 6055 */
PTR sys_fork
PTR sys32_execve
PTR compat_sys_execve
PTR sys_exit
PTR compat_sys_wait4
PTR sys_kill /* 6060 */

2
arch/mips/kernel/scall64-o32.S
ファイルの表示

@@ -203,7 +203,7 @@ sys_call_table:
PTR sys_creat
PTR sys_link
PTR sys_unlink /* 4010 */
PTR sys32_execve
PTR compat_sys_execve
PTR sys_chdir
PTR compat_sys_time
PTR sys_mknod

57
arch/mips/kernel/syscall.c
ファイルの表示

@@ -92,7 +92,7 @@ save_static_function(sys_fork);
static int __used noinline
_sys_fork(nabi_no_regargs struct pt_regs regs)
{
return do_fork(SIGCHLD, regs.regs[29], &regs, 0, NULL, NULL);
return do_fork(SIGCHLD, regs.regs[29], 0, NULL, NULL);
}
save_static_function(sys_clone);
@@ -123,32 +123,10 @@ _sys_clone(nabi_no_regargs struct pt_regs regs)
#else
child_tidptr = (int __user *) regs.regs[8];
#endif
return do_fork(clone_flags, newsp, &regs, 0,
return do_fork(clone_flags, newsp, 0,
parent_tidptr, child_tidptr);
}
/*
* sys_execve() executes a new program.
*/
asmlinkage int sys_execve(nabi_no_regargs struct pt_regs regs)
{
int error;
struct filename *filename;
filename = getname((const char __user *) (long)regs.regs[4]);
error = PTR_ERR(filename);
if (IS_ERR(filename))
goto out;
error = do_execve(filename->name,
(const char __user *const __user *) (long)regs.regs[5],
(const char __user *const __user *) (long)regs.regs[6],
&regs);
putname(filename);
out:
return error;
}
SYSCALL_DEFINE1(set_thread_area, unsigned long, addr)
{
struct thread_info *ti = task_thread_info(current);
@@ -313,34 +291,3 @@ asmlinkage void bad_stack(void)
{
do_exit(SIGSEGV);
}
/*
* Do a system call from kernel instead of calling sys_execve so we
* end up with proper pt_regs.
*/
int kernel_execve(const char *filename,
const char *const argv[],
const char *const envp[])
{
register unsigned long __a0 asm("$4") = (unsigned long) filename;
register unsigned long __a1 asm("$5") = (unsigned long) argv;
register unsigned long __a2 asm("$6") = (unsigned long) envp;
register unsigned long __a3 asm("$7");
unsigned long __v0;
__asm__ volatile (" \n"
" .set noreorder \n"
" li $2, %5 # __NR_execve \n"
" syscall \n"
" move %0, $2 \n"
" .set reorder \n"
: "=&r" (__v0), "=r" (__a3)
: "r" (__a0), "r" (__a1), "r" (__a2), "i" (__NR_execve)
: "$2", "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", "$24",
"memory");
if (__a3 == 0)
return __v0;
return -__v0;
}