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blackfin: convert kernel_thread() and kernel_execve() to generic ones

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-10-13 03:22:53 -04:00
parent ddffeb8c4d
commit ee1e17c69e
5 changed files with 27 additions and 109 deletions
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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..
*/

22
arch/blackfin/kernel/entry.S
View file

@ -46,22 +46,16 @@ 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)

55
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.
*
@ -193,13 +159,26 @@ copy_thread(unsigned long clone_flags,
struct task_struct *p, struct pt_regs *regs)
{
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(!regs)) {
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 = *regs;
childregs->r0 = 0;
p->thread.usp = usp;
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;

55
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);