#include <linux/fs.h>
#include <linux/ptrace.h>
#include <linux/reboot.h>
+#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/io.h>
#include <asm/pgtable.h>
#include <asm/mmu_context.h>
#include <asm/fpu.h>
+#include <asm/switch_to.h>
struct task_struct *last_task_used_math = NULL;
+struct pt_regs fake_swapper_regs = { 0, };
void show_regs(struct pt_regs *regs)
{
unsigned long long ah, al, bh, bl, ch, cl;
printk("\n");
+ show_regs_print_info(KERN_DEFAULT);
ah = (regs->pc) >> 32;
al = (regs->pc) & 0xffffffff;
}
}
-/*
- * Create a kernel thread
- */
-ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *))
-{
- do_exit(fn(arg));
-}
-
-/*
- * This is the mechanism for creating a new kernel thread.
- *
- * NOTE! Only a kernel-only process(ie the swapper or direct descendants
- * who haven't done an "execve()") should use this: it will work within
- * a system call from a "real" process, but the process memory space will
- * not be freed until both the parent and the child have exited.
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
- struct pt_regs regs;
-
- memset(®s, 0, sizeof(regs));
- regs.regs[2] = (unsigned long)arg;
- regs.regs[3] = (unsigned long)fn;
-
- regs.pc = (unsigned long)kernel_thread_helper;
- regs.sr = (1 << 30);
-
- /* Ok, create the new process.. */
- return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
- ®s, 0, NULL, NULL);
-}
-EXPORT_SYMBOL(kernel_thread);
-
/*
* Free current thread data structures etc..
*/
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 pt_regs *childregs;
+ struct pt_regs *childregs, *regs = current_pt_regs();
#ifdef CONFIG_SH_FPU
- if(last_task_used_math == current) {
+ /* can't happen for a kernel thread */
+ if (last_task_used_math == current) {
enable_fpu();
save_fpu(current);
disable_fpu();
last_task_used_math = NULL;
- regs->sr |= SR_FD;
+ current_pt_regs()->sr |= SR_FD;
}
#endif
/* Copy from sh version */
childregs = (struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1;
+ p->thread.sp = (unsigned long) childregs;
- *childregs = *regs;
+ if (unlikely(p->flags & PF_KTHREAD)) {
+ memset(childregs, 0, sizeof(struct pt_regs));
+ childregs->regs[2] = (unsigned long)arg;
+ childregs->regs[3] = (unsigned long)fn;
+ childregs->sr = (1 << 30); /* not user_mode */
+ childregs->sr |= SR_FD; /* Invalidate FPU flag */
+ p->thread.pc = (unsigned long) ret_from_kernel_thread;
+ return 0;
+ }
+ *childregs = *current_pt_regs();
/*
* Sign extend the edited stack.
* 32-bit wide and context switch must take care
* of NEFF sign extension.
*/
- if (user_mode(regs)) {
+ if (usp)
childregs->regs[15] = neff_sign_extend(usp);
- p->thread.uregs = childregs;
- } else {
- childregs->regs[15] =
- neff_sign_extend((unsigned long)task_stack_page(p) +
- THREAD_SIZE);
- }
+ p->thread.uregs = childregs;
childregs->regs[9] = 0; /* Set return value for child */
childregs->sr |= SR_FD; /* Invalidate FPU flag */
- p->thread.sp = (unsigned long) childregs;
p->thread.pc = (unsigned long) ret_from_fork;
return 0;
}
-asmlinkage int sys_fork(unsigned long r2, unsigned long r3,
- unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs *pregs)
-{
- return do_fork(SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
-}
-
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
- unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs *pregs)
-{
- if (!newsp)
- newsp = pregs->regs[15];
- return do_fork(clone_flags, newsp, pregs, 0, 0, 0);
-}
-
-/*
- * 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 r2, unsigned long r3,
- unsigned long r4, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs *pregs)
-{
- return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, pregs->regs[15], pregs, 0, 0, 0);
-}
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(char *ufilename, char **uargv,
- char **uenvp, unsigned long r5,
- unsigned long r6, unsigned long r7,
- struct pt_regs *pregs)
-{
- int error;
- char *filename;
-
- filename = getname((char __user *)ufilename);
- error = PTR_ERR(filename);
- if (IS_ERR(filename))
- goto out;
-
- error = do_execve(filename,
- (char __user * __user *)uargv,
- (char __user * __user *)uenvp,
- pregs);
- putname(filename);
-out:
- return error;
-}
-
#ifdef CONFIG_FRAME_POINTER
static int in_sh64_switch_to(unsigned long pc)
{
Code Review / linux-3.10.git / blobdiff