diff options
Diffstat (limited to 'arch/microblaze/kernel')
| -rw-r--r-- | arch/microblaze/kernel/entry-nommu.S | 12 | ||||
| -rw-r--r-- | arch/microblaze/kernel/entry.S | 33 | ||||
| -rw-r--r-- | arch/microblaze/kernel/process.c | 72 | ||||
| -rw-r--r-- | arch/microblaze/kernel/signal.c | 2 | ||||
| -rw-r--r-- | arch/microblaze/kernel/sys_microblaze.c | 39 |
5 files changed, 40 insertions, 118 deletions
diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S index 75c3ea1f48a..673a49c04a0 100644 --- a/arch/microblaze/kernel/entry-nommu.S +++ b/arch/microblaze/kernel/entry-nommu.S @@ -474,6 +474,14 @@ ENTRY(ret_from_fork) brid ret_to_user nop +ENTRY(ret_from_kernel_thread) + brlid r15, schedule_tail + addk r5, r0, r3 + brald r15, r20 + addk r5, r0, r19 + brid ret_to_user + addk r3, r0, r0 + work_pending: enable_irq @@ -559,10 +567,6 @@ sys_clone: brid microblaze_clone addk r7, r1, r0 -sys_execve: - brid microblaze_execve - addk r8, r1, r0 - sys_rt_sigreturn_wrapper: brid sys_rt_sigreturn addk r5, r1, r0 diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S index 03f7b8ce6b6..10f360ed82b 100644 --- a/arch/microblaze/kernel/entry.S +++ b/arch/microblaze/kernel/entry.S @@ -293,24 +293,6 @@ C_ENTRY(_user_exception): swi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */ addi r14, r14, 4 /* return address is 4 byte after call */ - mfs r1, rmsr - nop - andi r1, r1, MSR_UMS - bnei r1, 1f - -/* Kernel-mode state save - kernel execve */ - lwi r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/ - tophys(r1,r1); - - addik r1, r1, -PT_SIZE; /* Make room on the stack. */ - SAVE_REGS - - swi r1, r1, PT_MODE; /* pt_regs -> kernel mode */ - brid 2f; - nop; /* Fill delay slot */ - -/* User-mode state save. */ -1: lwi r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */ tophys(r1,r1); lwi r1, r1, TS_THREAD_INFO; /* get stack from task_struct */ @@ -479,11 +461,20 @@ C_ENTRY(sys_fork_wrapper): saved context). */ C_ENTRY(ret_from_fork): bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ - add r3, r5, r0; /* switch_thread returns the prev task */ + add r5, r3, r0; /* switch_thread returns the prev task */ /* ( in the delay slot ) */ brid ret_from_trap; /* Do normal trap return */ add r3, r0, r0; /* Child's fork call should return 0. */ +C_ENTRY(ret_from_kernel_thread): + bralid r15, schedule_tail; /* ...which is schedule_tail's arg */ + add r5, r3, r0; /* switch_thread returns the prev task */ + /* ( in the delay slot ) */ + brald r15, r20 /* fn was left in r20 */ + addk r5, r0, r19 /* ... and argument - in r19 */ + brid ret_from_trap + add r3, r0, r0 + C_ENTRY(sys_vfork): brid microblaze_vfork /* Do real work (tail-call) */ addik r5, r1, 0 @@ -498,10 +489,6 @@ C_ENTRY(sys_clone): brid do_fork /* Do real work (tail-call) */ add r8, r0, r0; /* Arg 3: (unused) */ -C_ENTRY(sys_execve): - brid microblaze_execve; /* Do real work (tail-call).*/ - addik r8, r1, 0; /* add user context as 4th arg */ - C_ENTRY(sys_rt_sigreturn_wrapper): brid sys_rt_sigreturn /* Do real work */ addik r5, r1, 0; /* add user context as 1st arg */ diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c index 1944e00f07e..29768c3dc35 100644 --- a/arch/microblaze/kernel/process.c +++ b/arch/microblaze/kernel/process.c @@ -119,46 +119,38 @@ void flush_thread(void) } int copy_thread(unsigned long clone_flags, unsigned long usp, - unsigned long unused, + unsigned long arg, struct task_struct *p, struct pt_regs *regs) { struct pt_regs *childregs = task_pt_regs(p); struct thread_info *ti = task_thread_info(p); + if (unlikely(p->flags & PF_KTHREAD)) { + /* if we're creating a new kernel thread then just zeroing all + * the registers. That's OK for a brand new thread.*/ + memset(childregs, 0, sizeof(struct pt_regs)); + memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); + ti->cpu_context.r1 = (unsigned long)childregs; + ti->cpu_context.r20 = (unsigned long)usp; /* fn */ + ti->cpu_context.r19 = (unsigned long)arg; + childregs->pt_mode = 1; + local_save_flags(childregs->msr); +#ifdef CONFIG_MMU + ti->cpu_context.msr = childregs->msr & ~MSR_IE; +#endif + ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8; + return 0; + } *childregs = *regs; - if (user_mode(regs)) - childregs->r1 = usp; - else - childregs->r1 = ((unsigned long) ti) + THREAD_SIZE; + childregs->r1 = usp; -#ifndef CONFIG_MMU memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); ti->cpu_context.r1 = (unsigned long)childregs; +#ifndef CONFIG_MMU ti->cpu_context.msr = (unsigned long)childregs->msr; #else + childregs->msr |= MSR_UMS; - /* if creating a kernel thread then update the current reg (we don't - * want to use the parent's value when restoring by POP_STATE) */ - if (kernel_mode(regs)) - /* save new current on stack to use POP_STATE */ - childregs->CURRENT_TASK = (unsigned long)p; - /* if returning to user then use the parent's value of this register */ - - /* if we're creating a new kernel thread then just zeroing all - * the registers. That's OK for a brand new thread.*/ - /* Pls. note that some of them will be restored in POP_STATE */ - if (kernel_mode(regs)) - memset(&ti->cpu_context, 0, sizeof(struct cpu_context)); - /* if this thread is created for fork/vfork/clone, then we want to - * restore all the parent's context */ - /* in addition to the registers which will be restored by POP_STATE */ - else { - ti->cpu_context = *(struct cpu_context *)regs; - childregs->msr |= MSR_UMS; - } - - /* FIXME STATE_SAVE_PT_OFFSET; */ - ti->cpu_context.r1 = (unsigned long)childregs; /* we should consider the fact that childregs is a copy of the parent * regs which were saved immediately after entering the kernel state * before enabling VM. This MSR will be restored in switch_to and @@ -209,29 +201,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk) } #endif -static void kernel_thread_helper(int (*fn)(void *), void *arg) -{ - fn(arg); - do_exit(-1); -} - -int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags) -{ - struct pt_regs regs; - - memset(®s, 0, sizeof(regs)); - /* store them in non-volatile registers */ - regs.r5 = (unsigned long)fn; - regs.r6 = (unsigned long)arg; - local_save_flags(regs.msr); - regs.pc = (unsigned long)kernel_thread_helper; - regs.pt_mode = 1; - - return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, - ®s, 0, NULL, NULL); -} -EXPORT_SYMBOL_GPL(kernel_thread); - unsigned long get_wchan(struct task_struct *p) { /* TBD (used by procfs) */ @@ -246,6 +215,7 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp) regs->pt_mode = 0; #ifdef CONFIG_MMU regs->msr |= MSR_UMS; + regs->msr &= ~MSR_VM; #endif } diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c index 3847e5b9c60..3903e3d11f5 100644 --- a/arch/microblaze/kernel/signal.c +++ b/arch/microblaze/kernel/signal.c @@ -111,7 +111,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs) /* It is more difficult to avoid calling this function than to call it and ignore errors. */ - if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->r1)) + if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->r1) == -EFAULT) goto badframe; return rval; diff --git a/arch/microblaze/kernel/sys_microblaze.c b/arch/microblaze/kernel/sys_microblaze.c index 404c0f24bd4..a6a7bae9f5c 100644 --- a/arch/microblaze/kernel/sys_microblaze.c +++ b/arch/microblaze/kernel/sys_microblaze.c @@ -48,24 +48,6 @@ asmlinkage long microblaze_clone(int flags, unsigned long stack, return do_fork(flags, stack, regs, 0, NULL, NULL); } -asmlinkage long microblaze_execve(const char __user *filenamei, - const char __user *const __user *argv, - const char __user *const __user *envp, - struct pt_regs *regs) -{ - int error; - struct filename *filename; - - filename = getname(filenamei); - error = PTR_ERR(filename); - if (IS_ERR(filename)) - goto out; - error = do_execve(filename->name, argv, envp, regs); - putname(filename); -out: - return error; -} - asmlinkage long sys_mmap(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, off_t pgoff) @@ -75,24 +57,3 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len, return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT); } - -/* - * 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 const char *__a __asm__("r5") = filename; - register const void *__b __asm__("r6") = argv; - register const void *__c __asm__("r7") = envp; - register unsigned long __syscall __asm__("r12") = __NR_execve; - register unsigned long __ret __asm__("r3"); - __asm__ __volatile__ ("brki r14, 0x8" - : "=r" (__ret), "=r" (__syscall) - : "1" (__syscall), "r" (__a), "r" (__b), "r" (__c) - : "r4", "r8", "r9", - "r10", "r11", "r14", "cc", "memory"); - return __ret; -} |