diff options
Diffstat (limited to 'arch/sparc/kernel/process_64.c')
| -rw-r--r-- | arch/sparc/kernel/process_64.c | 812 |
1 files changed, 812 insertions, 0 deletions
diff --git a/arch/sparc/kernel/process_64.c b/arch/sparc/kernel/process_64.c new file mode 100644 index 00000000000..d5e2acef987 --- /dev/null +++ b/arch/sparc/kernel/process_64.c @@ -0,0 +1,812 @@ +/* arch/sparc64/kernel/process.c + * + * Copyright (C) 1995, 1996, 2008 David S. Miller (davem@davemloft.net) + * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be) + * Copyright (C) 1997, 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) + */ + +/* + * This file handles the architecture-dependent parts of process handling.. + */ + +#include <stdarg.h> + +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/fs.h> +#include <linux/smp.h> +#include <linux/stddef.h> +#include <linux/ptrace.h> +#include <linux/slab.h> +#include <linux/user.h> +#include <linux/delay.h> +#include <linux/compat.h> +#include <linux/tick.h> +#include <linux/init.h> +#include <linux/cpu.h> +#include <linux/elfcore.h> +#include <linux/sysrq.h> + +#include <asm/uaccess.h> +#include <asm/system.h> +#include <asm/page.h> +#include <asm/pgalloc.h> +#include <asm/pgtable.h> +#include <asm/processor.h> +#include <asm/pstate.h> +#include <asm/elf.h> +#include <asm/fpumacro.h> +#include <asm/head.h> +#include <asm/cpudata.h> +#include <asm/mmu_context.h> +#include <asm/unistd.h> +#include <asm/hypervisor.h> +#include <asm/syscalls.h> +#include <asm/irq_regs.h> +#include <asm/smp.h> + +#include "kstack.h" + +static void sparc64_yield(int cpu) +{ + if (tlb_type != hypervisor) + return; + + clear_thread_flag(TIF_POLLING_NRFLAG); + smp_mb__after_clear_bit(); + + while (!need_resched() && !cpu_is_offline(cpu)) { + unsigned long pstate; + + /* Disable interrupts. */ + __asm__ __volatile__( + "rdpr %%pstate, %0\n\t" + "andn %0, %1, %0\n\t" + "wrpr %0, %%g0, %%pstate" + : "=&r" (pstate) + : "i" (PSTATE_IE)); + + if (!need_resched() && !cpu_is_offline(cpu)) + sun4v_cpu_yield(); + + /* Re-enable interrupts. */ + __asm__ __volatile__( + "rdpr %%pstate, %0\n\t" + "or %0, %1, %0\n\t" + "wrpr %0, %%g0, %%pstate" + : "=&r" (pstate) + : "i" (PSTATE_IE)); + } + + set_thread_flag(TIF_POLLING_NRFLAG); +} + +/* The idle loop on sparc64. */ +void cpu_idle(void) +{ + int cpu = smp_processor_id(); + + set_thread_flag(TIF_POLLING_NRFLAG); + + while(1) { + tick_nohz_stop_sched_tick(1); + + while (!need_resched() && !cpu_is_offline(cpu)) + sparc64_yield(cpu); + + tick_nohz_restart_sched_tick(); + + preempt_enable_no_resched(); + +#ifdef CONFIG_HOTPLUG_CPU + if (cpu_is_offline(cpu)) + cpu_play_dead(); +#endif + + schedule(); + preempt_disable(); + } +} + +#ifdef CONFIG_COMPAT +static void show_regwindow32(struct pt_regs *regs) +{ + struct reg_window32 __user *rw; + struct reg_window32 r_w; + mm_segment_t old_fs; + + __asm__ __volatile__ ("flushw"); + rw = compat_ptr((unsigned)regs->u_regs[14]); + old_fs = get_fs(); + set_fs (USER_DS); + if (copy_from_user (&r_w, rw, sizeof(r_w))) { + set_fs (old_fs); + return; + } + + set_fs (old_fs); + printk("l0: %08x l1: %08x l2: %08x l3: %08x " + "l4: %08x l5: %08x l6: %08x l7: %08x\n", + r_w.locals[0], r_w.locals[1], r_w.locals[2], r_w.locals[3], + r_w.locals[4], r_w.locals[5], r_w.locals[6], r_w.locals[7]); + printk("i0: %08x i1: %08x i2: %08x i3: %08x " + "i4: %08x i5: %08x i6: %08x i7: %08x\n", + r_w.ins[0], r_w.ins[1], r_w.ins[2], r_w.ins[3], + r_w.ins[4], r_w.ins[5], r_w.ins[6], r_w.ins[7]); +} +#else +#define show_regwindow32(regs) do { } while (0) +#endif + +static void show_regwindow(struct pt_regs *regs) +{ + struct reg_window __user *rw; + struct reg_window *rwk; + struct reg_window r_w; + mm_segment_t old_fs; + + if ((regs->tstate & TSTATE_PRIV) || !(test_thread_flag(TIF_32BIT))) { + __asm__ __volatile__ ("flushw"); + rw = (struct reg_window __user *) + (regs->u_regs[14] + STACK_BIAS); + rwk = (struct reg_window *) + (regs->u_regs[14] + STACK_BIAS); + if (!(regs->tstate & TSTATE_PRIV)) { + old_fs = get_fs(); + set_fs (USER_DS); + if (copy_from_user (&r_w, rw, sizeof(r_w))) { + set_fs (old_fs); + return; + } + rwk = &r_w; + set_fs (old_fs); + } + } else { + show_regwindow32(regs); + return; + } + printk("l0: %016lx l1: %016lx l2: %016lx l3: %016lx\n", + rwk->locals[0], rwk->locals[1], rwk->locals[2], rwk->locals[3]); + printk("l4: %016lx l5: %016lx l6: %016lx l7: %016lx\n", + rwk->locals[4], rwk->locals[5], rwk->locals[6], rwk->locals[7]); + printk("i0: %016lx i1: %016lx i2: %016lx i3: %016lx\n", + rwk->ins[0], rwk->ins[1], rwk->ins[2], rwk->ins[3]); + 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) + printk("I7: <%pS>\n", (void *) rwk->ins[7]); +} + +void show_regs(struct pt_regs *regs) +{ + printk("TSTATE: %016lx TPC: %016lx TNPC: %016lx Y: %08x %s\n", regs->tstate, + regs->tpc, regs->tnpc, regs->y, print_tainted()); + 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]); + printk("g4: %016lx g5: %016lx g6: %016lx g7: %016lx\n", + regs->u_regs[4], regs->u_regs[5], regs->u_regs[6], + regs->u_regs[7]); + printk("o0: %016lx o1: %016lx o2: %016lx o3: %016lx\n", + regs->u_regs[8], regs->u_regs[9], regs->u_regs[10], + regs->u_regs[11]); + 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]); + printk("RPC: <%pS>\n", (void *) regs->u_regs[15]); + show_regwindow(regs); +} + +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) +{ + flushw_all(); + + global_reg_snapshot[this_cpu].tstate = regs->tstate; + global_reg_snapshot[this_cpu].tpc = regs->tpc; + global_reg_snapshot[this_cpu].tnpc = regs->tnpc; + global_reg_snapshot[this_cpu].o7 = regs->u_regs[UREG_I7]; + + if (regs->tstate & TSTATE_PRIV) { + struct reg_window *rw; + + rw = (struct reg_window *) + (regs->u_regs[UREG_FP] + STACK_BIAS); + if (kstack_valid(tp, (unsigned long) rw)) { + global_reg_snapshot[this_cpu].i7 = rw->ins[7]; + rw = (struct reg_window *) + (rw->ins[6] + STACK_BIAS); + if (kstack_valid(tp, (unsigned long) 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; +} + +/* In order to avoid hangs we do not try to synchronize with the + * global register dump client cpus. The last store they make is to + * the thread pointer, so do a short poll waiting for that to become + * non-NULL. + */ +static void __global_reg_poll(struct global_reg_snapshot *gp) +{ + int limit = 0; + + while (!gp->thread && ++limit < 100) { + barrier(); + udelay(1); + } +} + +void __trigger_all_cpu_backtrace(void) +{ + struct thread_info *tp = current_thread_info(); + struct pt_regs *regs = get_irq_regs(); + unsigned long flags; + int this_cpu, cpu; + + if (!regs) + regs = tp->kregs; + + spin_lock_irqsave(&global_reg_snapshot_lock, flags); + + memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); + + this_cpu = raw_smp_processor_id(); + + __global_reg_self(tp, regs, this_cpu); + + smp_fetch_global_regs(); + + for_each_online_cpu(cpu) { + struct global_reg_snapshot *gp = &global_reg_snapshot[cpu]; + + __global_reg_poll(gp); + + tp = gp->thread; + printk("%c CPU[%3d]: TSTATE[%016lx] TPC[%016lx] TNPC[%016lx] TASK[%s:%d]\n", + (cpu == this_cpu ? '*' : ' '), cpu, + gp->tstate, gp->tpc, gp->tnpc, + ((tp && tp->task) ? tp->task->comm : "NULL"), + ((tp && tp->task) ? tp->task->pid : -1)); + + if (gp->tstate & TSTATE_PRIV) { + 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); + } + } + + memset(global_reg_snapshot, 0, sizeof(global_reg_snapshot)); + + 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", + .action_msg = "Show Global CPU Regs", +}; + +static int __init sparc_globreg_init(void) +{ + return register_sysrq_key('y', &sparc_globalreg_op); +} + +core_initcall(sparc_globreg_init); + +#endif + +unsigned long thread_saved_pc(struct task_struct *tsk) +{ + struct thread_info *ti = task_thread_info(tsk); + unsigned long ret = 0xdeadbeefUL; + + if (ti && ti->ksp) { + unsigned long *sp; + sp = (unsigned long *)(ti->ksp + STACK_BIAS); + if (((unsigned long)sp & (sizeof(long) - 1)) == 0UL && + sp[14]) { + unsigned long *fp; + fp = (unsigned long *)(sp[14] + STACK_BIAS); + if (((unsigned long)fp & (sizeof(long) - 1)) == 0UL) + ret = fp[15]; + } + } + return ret; +} + +/* Free current thread data structures etc.. */ +void exit_thread(void) +{ + struct thread_info *t = current_thread_info(); + + if (t->utraps) { + if (t->utraps[0] < 2) + kfree (t->utraps); + else + t->utraps[0]--; + } + + if (test_and_clear_thread_flag(TIF_PERFCTR)) { + t->user_cntd0 = t->user_cntd1 = NULL; + t->pcr_reg = 0; + write_pcr(0); + } +} + +void flush_thread(void) +{ + struct thread_info *t = current_thread_info(); + struct mm_struct *mm; + + if (test_ti_thread_flag(t, TIF_ABI_PENDING)) { + clear_ti_thread_flag(t, TIF_ABI_PENDING); + if (test_ti_thread_flag(t, TIF_32BIT)) + clear_ti_thread_flag(t, TIF_32BIT); + else + set_ti_thread_flag(t, TIF_32BIT); + } + + mm = t->task->mm; + if (mm) + tsb_context_switch(mm); + + set_thread_wsaved(0); + + /* Turn off performance counters if on. */ + if (test_and_clear_thread_flag(TIF_PERFCTR)) { + t->user_cntd0 = t->user_cntd1 = NULL; + t->pcr_reg = 0; + write_pcr(0); + } + + /* Clear FPU register state. */ + t->fpsaved[0] = 0; + + if (get_thread_current_ds() != ASI_AIUS) + set_fs(USER_DS); +} + +/* It's a bit more tricky when 64-bit tasks are involved... */ +static unsigned long clone_stackframe(unsigned long csp, unsigned long psp) +{ + unsigned long fp, distance, rval; + + if (!(test_thread_flag(TIF_32BIT))) { + csp += STACK_BIAS; + psp += STACK_BIAS; + __get_user(fp, &(((struct reg_window __user *)psp)->ins[6])); + fp += STACK_BIAS; + } else + __get_user(fp, &(((struct reg_window32 __user *)psp)->ins[6])); + + /* Now 8-byte align the stack as this is mandatory in the + * Sparc ABI due to how register windows work. This hides + * the restriction from thread libraries etc. -DaveM + */ + csp &= ~7UL; + + distance = fp - psp; + rval = (csp - distance); + if (copy_in_user((void __user *) rval, (void __user *) psp, distance)) + rval = 0; + else if (test_thread_flag(TIF_32BIT)) { + if (put_user(((u32)csp), + &(((struct reg_window32 __user *)rval)->ins[6]))) + rval = 0; + } else { + if (put_user(((u64)csp - STACK_BIAS), + &(((struct reg_window __user *)rval)->ins[6]))) + rval = 0; + else + rval = rval - STACK_BIAS; + } + + return rval; +} + +/* Standard stuff. */ +static inline void shift_window_buffer(int first_win, int last_win, + struct thread_info *t) +{ + int i; + + for (i = first_win; i < last_win; i++) { + t->rwbuf_stkptrs[i] = t->rwbuf_stkptrs[i+1]; + memcpy(&t->reg_window[i], &t->reg_window[i+1], + sizeof(struct reg_window)); + } +} + +void synchronize_user_stack(void) +{ + struct thread_info *t = current_thread_info(); + unsigned long window; + + flush_user_windows(); + if ((window = get_thread_wsaved()) != 0) { + int winsize = sizeof(struct reg_window); + int bias = 0; + + if (test_thread_flag(TIF_32BIT)) + winsize = sizeof(struct reg_window32); + else + bias = STACK_BIAS; + + window -= 1; + do { + unsigned long sp = (t->rwbuf_stkptrs[window] + bias); + struct reg_window *rwin = &t->reg_window[window]; + + if (!copy_to_user((char __user *)sp, rwin, winsize)) { + shift_window_buffer(window, get_thread_wsaved() - 1, t); + set_thread_wsaved(get_thread_wsaved() - 1); + } + } while (window--); + } +} + +static void stack_unaligned(unsigned long sp) +{ + siginfo_t info; + + info.si_signo = SIGBUS; + info.si_errno = 0; + info.si_code = BUS_ADRALN; + info.si_addr = (void __user *) sp; + info.si_trapno = 0; + force_sig_info(SIGBUS, &info, current); +} + +void fault_in_user_windows(void) +{ + struct thread_info *t = current_thread_info(); + unsigned long window; + int winsize = sizeof(struct reg_window); + int bias = 0; + + if (test_thread_flag(TIF_32BIT)) + winsize = sizeof(struct reg_window32); + else + bias = STACK_BIAS; + + flush_user_windows(); + window = get_thread_wsaved(); + + if (likely(window != 0)) { + window -= 1; + do { + unsigned long sp = (t->rwbuf_stkptrs[window] + bias); + struct reg_window *rwin = &t->reg_window[window]; + + if (unlikely(sp & 0x7UL)) + stack_unaligned(sp); + + if (unlikely(copy_to_user((char __user *)sp, + rwin, winsize))) + goto barf; + } while (window--); + } + set_thread_wsaved(0); + return; + +barf: + set_thread_wsaved(window + 1); + do_exit(SIGILL); +} + +asmlinkage long sparc_do_fork(unsigned long clone_flags, + unsigned long stack_start, + struct pt_regs *regs, + unsigned long stack_size) +{ + int __user *parent_tid_ptr, *child_tid_ptr; + unsigned long orig_i1 = regs->u_regs[UREG_I1]; + long ret; + +#ifdef CONFIG_COMPAT + if (test_thread_flag(TIF_32BIT)) { + parent_tid_ptr = compat_ptr(regs->u_regs[UREG_I2]); + child_tid_ptr = compat_ptr(regs->u_regs[UREG_I4]); + } else +#endif + { + parent_tid_ptr = (int __user *) regs->u_regs[UREG_I2]; + child_tid_ptr = (int __user *) regs->u_regs[UREG_I4]; + } + + ret = do_fork(clone_flags, stack_start, + regs, stack_size, + parent_tid_ptr, child_tid_ptr); + + /* If we get an error and potentially restart the system + * call, we're screwed because copy_thread() clobbered + * the parent's %o1. So detect that case and restore it + * here. + */ + if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK) + regs->u_regs[UREG_I1] = orig_i1; + + return ret; +} + +/* Copy a Sparc thread. The fork() return value conventions + * under SunOS are nothing short of bletcherous: + * Parent --> %o0 == childs pid, %o1 == 0 + * Child --> %o0 == parents pid, %o1 == 1 + */ +int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, + unsigned long unused, + struct task_struct *p, struct pt_regs *regs) +{ + struct thread_info *t = task_thread_info(p); + struct sparc_stackf *parent_sf; + unsigned long child_stack_sz; + char *child_trap_frame; + int kernel_thread; + + kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0; + parent_sf = ((struct sparc_stackf *) regs) - 1; + + /* Calculate offset to stack_frame & pt_regs */ + child_stack_sz = ((STACKFRAME_SZ + TRACEREG_SZ) + + (kernel_thread ? STACKFRAME_SZ : 0)); + child_trap_frame = (task_stack_page(p) + + (THREAD_SIZE - child_stack_sz)); + memcpy(child_trap_frame, parent_sf, child_stack_sz); + + t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | + (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) | + (((regs->tstate + 1) & TSTATE_CWP) << TI_FLAG_CWP_SHIFT); + t->new_child = 1; + t->ksp = ((unsigned long) child_trap_frame) - STACK_BIAS; + t->kregs = (struct pt_regs *) (child_trap_frame + + sizeof(struct sparc_stackf)); + t->fpsaved[0] = 0; + + if (kernel_thread) { + struct sparc_stackf *child_sf = (struct sparc_stackf *) + (child_trap_frame + (STACKFRAME_SZ + TRACEREG_SZ)); + + /* Zero terminate the stack backtrace. */ + child_sf->fp = NULL; + t->kregs->u_regs[UREG_FP] = + ((unsigned long) child_sf) - STACK_BIAS; + + /* Special case, if we are spawning a kernel thread from + * 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; + t->pcr_reg = 0; + t->flags &= ~_TIF_PERFCTR; + } + t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT); + t->kregs->u_regs[UREG_G6] = (unsigned long) t; + t->kregs->u_regs[UREG_G4] = (unsigned long) t->task; + } else { + if (t->flags & _TIF_32BIT) { + sp &= 0x00000000ffffffffUL; + regs->u_regs[UREG_FP] &= 0x00000000ffffffffUL; + } + t->kregs->u_regs[UREG_FP] = sp; + t->flags |= ((long)ASI_AIUS << TI_FLAG_CURRENT_DS_SHIFT); + if (sp != regs->u_regs[UREG_FP]) { + unsigned long csp; + + csp = clone_stackframe(sp, regs->u_regs[UREG_FP]); + if (!csp) + return -EFAULT; + t->kregs->u_regs[UREG_FP] = csp; + } + if (t->utraps) + t->utraps[0]++; + } + + /* Set the return value for the child. */ + t->kregs->u_regs[UREG_I0] = current->pid; + t->kregs->u_regs[UREG_I1] = 1; + + /* Set the second return value for the parent. */ + regs->u_regs[UREG_I1] = 0; + + if (clone_flags & CLONE_SETTLS) + t->kregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3]; + + return 0; +} + +/* + * 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. + */ +pid_t kernel_thread(int (*fn)(void *), void * arg, unsigned long flags) +{ + long retval; + + /* If the parent runs before fn(arg) is called by the child, + * the input registers of this function can be clobbered. + * So we stash 'fn' and 'arg' into global registers which + * will not be modified by the parent. + */ + __asm__ __volatile__("mov %4, %%g2\n\t" /* Save FN into global */ + "mov %5, %%g3\n\t" /* Save ARG into global */ + "mov %1, %%g1\n\t" /* Clone syscall nr. */ + "mov %2, %%o0\n\t" /* Clone flags. */ + "mov 0, %%o1\n\t" /* usp arg == 0 */ + "t 0x6d\n\t" /* Linux/Sparc clone(). */ + "brz,a,pn %%o1, 1f\n\t" /* Parent, just return. */ + " mov %%o0, %0\n\t" + "jmpl %%g2, %%o7\n\t" /* Call the function. */ + " mov %%g3, %%o0\n\t" /* Set arg in delay. */ + "mov %3, %%g1\n\t" + "t 0x6d\n\t" /* Linux/Sparc exit(). */ + /* Notreached by child. */ + "1:" : + "=r" (retval) : + "i" (__NR_clone), "r" (flags | CLONE_VM | CLONE_UNTRACED), + "i" (__NR_exit), "r" (fn), "r" (arg) : + "g1", "g2", "g3", "o0", "o1", "memory", "cc"); + return retval; +} + +typedef struct { + union { + unsigned int pr_regs[32]; + unsigned long pr_dregs[16]; + } pr_fr; + unsigned int __unused; + unsigned int pr_fsr; + unsigned char pr_qcnt; + unsigned char pr_q_entrysize; + unsigned char pr_en; + unsigned int pr_q[64]; +} elf_fpregset_t32; + +/* + * fill in the fpu structure for a core dump. + */ +int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs) +{ + unsigned long *kfpregs = current_thread_info()->fpregs; + unsigned long fprs = current_thread_info()->fpsaved[0]; + + if (test_thread_flag(TIF_32BIT)) { + elf_fpregset_t32 *fpregs32 = (elf_fpregset_t32 *)fpregs; + + if (fprs & FPRS_DL) + memcpy(&fpregs32->pr_fr.pr_regs[0], kfpregs, + sizeof(unsigned int) * 32); + else + memset(&fpregs32->pr_fr.pr_regs[0], 0, + sizeof(unsigned int) * 32); + fpregs32->pr_qcnt = 0; + fpregs32->pr_q_entrysize = 8; + memset(&fpregs32->pr_q[0], 0, + (sizeof(unsigned int) * 64)); + if (fprs & FPRS_FEF) { + fpregs32->pr_fsr = (unsigned int) current_thread_info()->xfsr[0]; + fpregs32->pr_en = 1; + } else { + fpregs32->pr_fsr = 0; + fpregs32->pr_en = 0; + } + } else { + if(fprs & FPRS_DL) + memcpy(&fpregs->pr_regs[0], kfpregs, + sizeof(unsigned int) * 32); + else + memset(&fpregs->pr_regs[0], 0, + sizeof(unsigned int) * 32); + if(fprs & FPRS_DU) + memcpy(&fpregs->pr_regs[16], kfpregs+16, + sizeof(unsigned int) * 32); + else + memset(&fpregs->pr_regs[16], 0, + sizeof(unsigned int) * 32); + if(fprs & FPRS_FEF) { + fpregs->pr_fsr = current_thread_info()->xfsr[0]; + fpregs->pr_gsr = current_thread_info()->gsr[0]; + } else { + fpregs->pr_fsr = fpregs->pr_gsr = 0; + } + fpregs->pr_fprs = fprs; + } + return 1; +} + +/* + * sparc_execve() executes a new program after the asm stub has set + * things up for us. This should basically do what I want it to. + */ +asmlinkage int sparc_execve(struct pt_regs *regs) +{ + int error, base = 0; + char *filename; + + /* User register window flush is done by entry.S */ + + /* Check for indirect call. */ + if (regs->u_regs[UREG_G1] == 0) + base = 1; + + filename = getname((char __user *)regs->u_regs[base + UREG_I0]); + error = PTR_ERR(filename); + if (IS_ERR(filename)) + goto out; + error = do_execve(filename, + (char __user * __user *) + regs->u_regs[base + UREG_I1], + (char __user * __user *) + regs->u_regs[base + UREG_I2], regs); + putname(filename); + if (!error) { + fprs_write(0); + current_thread_info()->xfsr[0] = 0; + current_thread_info()->fpsaved[0] = 0; + regs->tstate &= ~TSTATE_PEF; + } +out: + return error; +} + +unsigned long get_wchan(struct task_struct *task) +{ + unsigned long pc, fp, bias = 0; + struct thread_info *tp; + struct reg_window *rw; + unsigned long ret = 0; + int count = 0; + + if (!task || task == current || + task->state == TASK_RUNNING) + goto out; + + tp = task_thread_info(task); + bias = STACK_BIAS; + fp = task_thread_info(task)->ksp + bias; + + do { + if (!kstack_valid(tp, fp)) + break; + rw = (struct reg_window *) fp; + pc = rw->ins[7]; + if (!in_sched_functions(pc)) { + ret = pc; + goto out; + } + fp = rw->ins[6] + bias; + } while (++count < 16); + +out: + return ret; +} |