diff options
Diffstat (limited to 'arch/sh/kernel/process_32.c')
| -rw-r--r-- | arch/sh/kernel/process_32.c | 146 |
1 files changed, 24 insertions, 122 deletions
diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c index 59521e8a164..2885fc9d9dc 100644 --- a/arch/sh/kernel/process_32.c +++ b/arch/sh/kernel/process_32.c @@ -32,11 +32,7 @@ void show_regs(struct pt_regs * regs) { printk("\n"); - printk("Pid : %d, Comm: \t\t%s\n", task_pid_nr(current), current->comm); - printk("CPU : %d \t\t%s (%s %.*s)\n\n", - smp_processor_id(), print_tainted(), init_utsname()->release, - (int)strcspn(init_utsname()->version, " "), - init_utsname()->version); + show_regs_print_info(KERN_DEFAULT); print_symbol("PC is at %s\n", instruction_pointer(regs)); print_symbol("PR is at %s\n", regs->pr); @@ -68,38 +64,6 @@ 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(®s, 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, - ®s, 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 +121,10 @@ 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 +141,35 @@ 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; + p->thread.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; } @@ -219,7 +189,7 @@ __switch_to(struct task_struct *prev, struct task_struct *next) unlazy_fpu(prev, task_pt_regs(prev)); /* we're going to use this soon, after a few expensive things */ - if (next->fpu_counter > 5) + if (next->thread.fpu_counter > 5) prefetch(next_t->xstate); #ifdef CONFIG_MMU @@ -237,80 +207,12 @@ __switch_to(struct task_struct *prev, struct task_struct *next) * restore of the math state immediately to avoid the trap; the * chances of needing FPU soon are obviously high now */ - if (next->fpu_counter > 5) + if (next->thread.fpu_counter > 5) __fpu_state_restore(); 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; - char *filename; - - filename = getname(ufilename); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - - error = do_execve(filename, uargv, uenvp, regs); - putname(filename); -out: - return error; -} - unsigned long get_wchan(struct task_struct *p) { unsigned long pc; |