diff options
Diffstat (limited to 'arch/powerpc/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 68 |
1 files changed, 41 insertions, 27 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index ce393df243aa..dd9e0d5386ee 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -176,7 +176,7 @@ static void __giveup_fpu(struct task_struct *tsk) save_fpu(tsk); msr = tsk->thread.regs->msr; - msr &= ~MSR_FP; + msr &= ~(MSR_FP|MSR_FE0|MSR_FE1); #ifdef CONFIG_VSX if (cpu_has_feature(CPU_FTR_VSX)) msr &= ~MSR_VSX; @@ -1231,8 +1231,8 @@ struct task_struct *__switch_to(struct task_struct *prev, batch->active = 1; } - if (current_thread_info()->task->thread.regs) { - restore_math(current_thread_info()->task->thread.regs); + if (current->thread.regs) { + restore_math(current->thread.regs); /* * The copy-paste buffer can only store into foreign real @@ -1242,7 +1242,7 @@ struct task_struct *__switch_to(struct task_struct *prev, * mappings, we must issue a cp_abort to clear any state and * prevent snooping, corruption or a covert channel. */ - if (current_thread_info()->task->thread.used_vas) + if (current->thread.used_vas) asm volatile(PPC_CP_ABORT); } #endif /* CONFIG_PPC_BOOK3S_64 */ @@ -1634,7 +1634,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; struct thread_info *ti = task_thread_info(p); - klp_init_thread_info(ti); + klp_init_thread_info(p); /* Copy registers */ sp -= sizeof(struct pt_regs); @@ -1691,8 +1691,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, sp -= STACK_FRAME_OVERHEAD; p->thread.ksp = sp; #ifdef CONFIG_PPC32 - p->thread.ksp_limit = (unsigned long)task_stack_page(p) + - _ALIGN_UP(sizeof(struct thread_info), 16); + p->thread.ksp_limit = (unsigned long)end_of_stack(p); #endif #ifdef CONFIG_HAVE_HW_BREAKPOINT p->thread.ptrace_bps[0] = NULL; @@ -1995,21 +1994,14 @@ static inline int valid_irq_stack(unsigned long sp, struct task_struct *p, unsigned long stack_page; unsigned long cpu = task_cpu(p); - /* - * Avoid crashing if the stack has overflowed and corrupted - * task_cpu(p), which is in the thread_info struct. - */ - if (cpu < NR_CPUS && cpu_possible(cpu)) { - stack_page = (unsigned long) hardirq_ctx[cpu]; - if (sp >= stack_page + sizeof(struct thread_struct) - && sp <= stack_page + THREAD_SIZE - nbytes) - return 1; - - stack_page = (unsigned long) softirq_ctx[cpu]; - if (sp >= stack_page + sizeof(struct thread_struct) - && sp <= stack_page + THREAD_SIZE - nbytes) - return 1; - } + stack_page = (unsigned long)hardirq_ctx[cpu]; + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; + + stack_page = (unsigned long)softirq_ctx[cpu]; + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) + return 1; + return 0; } @@ -2018,8 +2010,10 @@ int validate_sp(unsigned long sp, struct task_struct *p, { unsigned long stack_page = (unsigned long)task_stack_page(p); - if (sp >= stack_page + sizeof(struct thread_struct) - && sp <= stack_page + THREAD_SIZE - nbytes) + if (sp < THREAD_SIZE) + return 0; + + if (sp >= stack_page && sp <= stack_page + THREAD_SIZE - nbytes) return 1; return valid_irq_stack(sp, p, nbytes); @@ -2027,7 +2021,7 @@ int validate_sp(unsigned long sp, struct task_struct *p, EXPORT_SYMBOL(validate_sp); -unsigned long get_wchan(struct task_struct *p) +static unsigned long __get_wchan(struct task_struct *p) { unsigned long ip, sp; int count = 0; @@ -2053,6 +2047,20 @@ unsigned long get_wchan(struct task_struct *p) return 0; } +unsigned long get_wchan(struct task_struct *p) +{ + unsigned long ret; + + if (!try_get_task_stack(p)) + return 0; + + ret = __get_wchan(p); + + put_task_stack(p); + + return ret; +} + static int kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH; void show_stack(struct task_struct *tsk, unsigned long *stack) @@ -2067,9 +2075,13 @@ void show_stack(struct task_struct *tsk, unsigned long *stack) int curr_frame = 0; #endif - sp = (unsigned long) stack; if (tsk == NULL) tsk = current; + + if (!try_get_task_stack(tsk)) + return; + + sp = (unsigned long) stack; if (sp == 0) { if (tsk == current) sp = current_stack_pointer(); @@ -2081,7 +2093,7 @@ void show_stack(struct task_struct *tsk, unsigned long *stack) printk("Call Trace:\n"); do { if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD)) - return; + break; stack = (unsigned long *) sp; newsp = stack[0]; @@ -2121,6 +2133,8 @@ void show_stack(struct task_struct *tsk, unsigned long *stack) sp = newsp; } while (count++ < kstack_depth_to_print); + + put_task_stack(tsk); } #ifdef CONFIG_PPC64 |