diff options
Diffstat (limited to 'arch/sparc64/kernel/process.c')
-rw-r--r-- | arch/sparc64/kernel/process.c | 140 |
1 files changed, 46 insertions, 94 deletions
diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c index 2084f81a76e1..7f5debdc5fed 100644 --- a/arch/sparc64/kernel/process.c +++ b/arch/sparc64/kernel/process.c @@ -15,7 +15,6 @@ #include <linux/module.h> #include <linux/sched.h> #include <linux/kernel.h> -#include <linux/kallsyms.h> #include <linux/mm.h> #include <linux/fs.h> #include <linux/smp.h> @@ -53,8 +52,6 @@ #include <asm/irq_regs.h> #include <asm/smp.h> -/* #define VERBOSE_SHOWREGS */ - static void sparc64_yield(int cpu) { if (tlb_type != hypervisor) @@ -97,7 +94,7 @@ void cpu_idle(void) set_thread_flag(TIF_POLLING_NRFLAG); while(1) { - tick_nohz_stop_sched_tick(); + tick_nohz_stop_sched_tick(1); while (!need_resched() && !cpu_is_offline(cpu)) sparc64_yield(cpu); @@ -211,28 +208,14 @@ static void show_regwindow(struct pt_regs *regs) printk("i4: %016lx i5: %016lx i6: %016lx i7: %016lx\n", rwk->ins[4], rwk->ins[5], rwk->ins[6], rwk->ins[7]); if (regs->tstate & TSTATE_PRIV) - print_symbol("I7: <%s>\n", rwk->ins[7]); + printk("I7: <%pS>\n", (void *) rwk->ins[7]); } -#ifdef CONFIG_SMP -static DEFINE_SPINLOCK(regdump_lock); -#endif - -void __show_regs(struct pt_regs * regs) +void show_regs(struct pt_regs *regs) { -#ifdef CONFIG_SMP - unsigned long flags; - - /* Protect against xcall ipis which might lead to livelock on the lock */ - __asm__ __volatile__("rdpr %%pstate, %0\n\t" - "wrpr %0, %1, %%pstate" - : "=r" (flags) - : "i" (PSTATE_IE)); - spin_lock(®dump_lock); -#endif printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, regs->tpc, regs->tnpc, regs->y, print_tainted()); - print_symbol("TPC: <%s>\n", regs->tpc); + printk("TPC: <%pS>\n", (void *) regs->tpc); printk("g0: %016lx g1: %016lx g2: %016lx g3: %016lx\n", regs->u_regs[0], regs->u_regs[1], regs->u_regs[2], regs->u_regs[3]); @@ -245,66 +228,26 @@ void __show_regs(struct pt_regs * regs) printk("o4: %016lx o5: %016lx sp: %016lx ret_pc: %016lx\n", regs->u_regs[12], regs->u_regs[13], regs->u_regs[14], regs->u_regs[15]); - print_symbol("RPC: <%s>\n", regs->u_regs[15]); + printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); show_regwindow(regs); -#ifdef CONFIG_SMP - spin_unlock(®dump_lock); - __asm__ __volatile__("wrpr %0, 0, %%pstate" - : : "r" (flags)); -#endif } -#ifdef VERBOSE_SHOWREGS -static void idump_from_user (unsigned int *pc) -{ - int i; - int code; - - if((((unsigned long) pc) & 3)) - return; - - pc -= 3; - for(i = -3; i < 6; i++) { - get_user(code, pc); - printk("%c%08x%c",i?' ':'<',code,i?' ':'>'); - pc++; - } - printk("\n"); -} -#endif +struct global_reg_snapshot global_reg_snapshot[NR_CPUS]; +static DEFINE_SPINLOCK(global_reg_snapshot_lock); -void show_regs(struct pt_regs *regs) +static bool kstack_valid(struct thread_info *tp, struct reg_window *rw) { -#ifdef VERBOSE_SHOWREGS - extern long etrap, etraptl1; -#endif - __show_regs(regs); -#if 0 -#ifdef CONFIG_SMP - { - extern void smp_report_regs(void); + unsigned long thread_base, fp; - smp_report_regs(); - } -#endif -#endif + thread_base = (unsigned long) tp; + fp = (unsigned long) rw; -#ifdef VERBOSE_SHOWREGS - if (regs->tpc >= &etrap && regs->tpc < &etraptl1 && - regs->u_regs[14] >= (long)current - PAGE_SIZE && - regs->u_regs[14] < (long)current + 6 * PAGE_SIZE) { - printk ("*********parent**********\n"); - __show_regs((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF)); - idump_from_user(((struct pt_regs *)(regs->u_regs[14] + PTREGS_OFF))->tpc); - printk ("*********endpar**********\n"); - } -#endif + if (fp < (thread_base + sizeof(struct thread_info)) || + fp >= (thread_base + THREAD_SIZE)) + return false; + return true; } -#ifdef CONFIG_MAGIC_SYSRQ -struct global_reg_snapshot global_reg_snapshot[NR_CPUS]; -static DEFINE_SPINLOCK(global_reg_snapshot_lock); - static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, int this_cpu) { @@ -316,14 +259,22 @@ static void __global_reg_self(struct thread_info *tp, struct pt_regs *regs, global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7]; if (regs->tstate & TSTATE_PRIV) { + struct thread_info *tp = current_thread_info(); struct reg_window *rw; rw = (struct reg_window *) (regs->u_regs[UREG_FP] + STACK_BIAS); - global_reg_snapshot[this_cpu].i7 = rw->ins[6]; - } else + if (kstack_valid(tp, rw)) { + global_reg_snapshot[this_cpu].i7 = rw->ins[7]; + rw = (struct reg_window *) + (rw->ins[6] + STACK_BIAS); + if (kstack_valid(tp, rw)) + global_reg_snapshot[this_cpu].rpc = rw->ins[7]; + } + } else { global_reg_snapshot[this_cpu].i7 = 0; - + global_reg_snapshot[this_cpu].rpc = 0; + } global_reg_snapshot[this_cpu].thread = tp; } @@ -342,13 +293,10 @@ static void __global_reg_poll(struct global_reg_snapshot *gp) } } -static void sysrq_handle_globreg(int key, struct tty_struct *tty) +void __trigger_all_cpu_backtrace(void) { struct thread_info *tp = current_thread_info(); struct pt_regs *regs = get_irq_regs(); -#ifdef CONFIG_KALLSYMS - char buffer[KSYM_SYMBOL_LEN]; -#endif unsigned long flags; int this_cpu, cpu; @@ -377,19 +325,16 @@ static void sysrq_handle_globreg(int key, struct tty_struct *tty) gp->tstate, gp->tpc, gp->tnpc, ((tp && tp->task) ? tp->task->comm : "NULL"), ((tp && tp->task) ? tp->task->pid : -1)); -#ifdef CONFIG_KALLSYMS + if (gp->tstate & TSTATE_PRIV) { - sprint_symbol(buffer, gp->tpc); - printk(" TPC[%s] ", buffer); - sprint_symbol(buffer, gp->o7); - printk("O7[%s] ", buffer); - sprint_symbol(buffer, gp->i7); - printk("I7[%s]\n", buffer); - } else -#endif - { - printk(" TPC[%lx] O7[%lx] I7[%lx]\n", - gp->tpc, gp->o7, gp->i7); + printk(" TPC[%pS] O7[%pS] I7[%pS] RPC[%pS]\n", + (void *) gp->tpc, + (void *) gp->o7, + (void *) gp->i7, + (void *) gp->rpc); + } else { + printk(" TPC[%lx] O7[%lx] I7[%lx] RPC[%lx]\n", + gp->tpc, gp->o7, gp->i7, gp->rpc); } } @@ -398,6 +343,13 @@ static void sysrq_handle_globreg(int key, struct tty_struct *tty) spin_unlock_irqrestore(&global_reg_snapshot_lock, flags); } +#ifdef CONFIG_MAGIC_SYSRQ + +static void sysrq_handle_globreg(int key, struct tty_struct *tty) +{ + __trigger_all_cpu_backtrace(); +} + static struct sysrq_key_op sparc_globalreg_op = { .handler = sysrq_handle_globreg, .help_msg = "Globalregs", @@ -691,9 +643,9 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, ((unsigned long) child_sf) - STACK_BIAS; /* Special case, if we are spawning a kernel thread from - * a userspace task (via KMOD, NFS, or similar) we must - * disable performance counters in the child because the - * address space and protection realm are changing. + * a userspace task (usermode helper, NFS or similar), we + * must disable performance counters in the child because + * the address space and protection realm are changing. */ if (t->flags & _TIF_PERFCTR) { t->user_cntd0 = t->user_cntd1 = NULL; |