![Simon Arlott](/assets/img/avatar_default.png)
Spelling fixes in arch/sparc/. Signed-off-by: Simon Arlott <simon@fire.lp0.eu> Signed-off-by: David S. Miller <davem@davemloft.net>
745 lines
20 KiB
C
745 lines
20 KiB
C
/* $Id: process.c,v 1.161 2002/01/23 11:27:32 davem Exp $
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* linux/arch/sparc/kernel/process.c
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
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*/
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/*
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* This file handles the architecture-dependent parts of process handling..
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*/
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#include <stdarg.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/kallsyms.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/ptrace.h>
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#include <linux/slab.h>
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#include <linux/user.h>
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#include <linux/a.out.h>
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#include <linux/smp.h>
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#include <linux/reboot.h>
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#include <linux/delay.h>
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#include <linux/pm.h>
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#include <linux/init.h>
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#include <asm/auxio.h>
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#include <asm/oplib.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <asm/page.h>
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#include <asm/pgalloc.h>
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#include <asm/pgtable.h>
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#include <asm/delay.h>
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#include <asm/processor.h>
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#include <asm/psr.h>
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#include <asm/elf.h>
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#include <asm/unistd.h>
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/*
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* Power management idle function
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* Set in pm platform drivers (apc.c and pmc.c)
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*/
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void (*pm_idle)(void);
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/*
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* Power-off handler instantiation for pm.h compliance
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* This is done via auxio, but could be used as a fallback
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* handler when auxio is not present-- unused for now...
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*/
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void (*pm_power_off)(void) = machine_power_off;
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EXPORT_SYMBOL(pm_power_off);
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/*
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* sysctl - toggle power-off restriction for serial console
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* systems in machine_power_off()
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*/
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int scons_pwroff = 1;
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extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
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struct task_struct *last_task_used_math = NULL;
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struct thread_info *current_set[NR_CPUS];
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#ifndef CONFIG_SMP
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#define SUN4C_FAULT_HIGH 100
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/*
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* the idle loop on a Sparc... ;)
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*/
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void cpu_idle(void)
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{
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/* endless idle loop with no priority at all */
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for (;;) {
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if (ARCH_SUN4C_SUN4) {
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static int count = HZ;
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static unsigned long last_jiffies;
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static unsigned long last_faults;
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static unsigned long fps;
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unsigned long now;
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unsigned long faults;
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extern unsigned long sun4c_kernel_faults;
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extern void sun4c_grow_kernel_ring(void);
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local_irq_disable();
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now = jiffies;
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count -= (now - last_jiffies);
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last_jiffies = now;
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if (count < 0) {
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count += HZ;
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faults = sun4c_kernel_faults;
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fps = (fps + (faults - last_faults)) >> 1;
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last_faults = faults;
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#if 0
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printk("kernel faults / second = %ld\n", fps);
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#endif
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if (fps >= SUN4C_FAULT_HIGH) {
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sun4c_grow_kernel_ring();
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}
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}
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local_irq_enable();
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}
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if (pm_idle) {
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while (!need_resched())
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(*pm_idle)();
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} else {
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while (!need_resched())
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cpu_relax();
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}
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preempt_enable_no_resched();
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schedule();
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preempt_disable();
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check_pgt_cache();
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}
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}
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#else
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/* This is being executed in task 0 'user space'. */
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void cpu_idle(void)
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{
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set_thread_flag(TIF_POLLING_NRFLAG);
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/* endless idle loop with no priority at all */
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while(1) {
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while (!need_resched())
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cpu_relax();
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preempt_enable_no_resched();
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schedule();
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preempt_disable();
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check_pgt_cache();
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}
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}
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#endif
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extern char reboot_command [];
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extern void (*prom_palette)(int);
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/* XXX cli/sti -> local_irq_xxx here, check this works once SMP is fixed. */
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void machine_halt(void)
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{
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local_irq_enable();
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mdelay(8);
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local_irq_disable();
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if (!serial_console && prom_palette)
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prom_palette (1);
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prom_halt();
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panic("Halt failed!");
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}
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void machine_restart(char * cmd)
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{
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char *p;
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local_irq_enable();
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mdelay(8);
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local_irq_disable();
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p = strchr (reboot_command, '\n');
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if (p) *p = 0;
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if (!serial_console && prom_palette)
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prom_palette (1);
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if (cmd)
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prom_reboot(cmd);
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if (*reboot_command)
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prom_reboot(reboot_command);
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prom_feval ("reset");
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panic("Reboot failed!");
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}
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void machine_power_off(void)
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{
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#ifdef CONFIG_SUN_AUXIO
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if (auxio_power_register && (!serial_console || scons_pwroff))
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*auxio_power_register |= AUXIO_POWER_OFF;
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#endif
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machine_halt();
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}
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static DEFINE_SPINLOCK(sparc_backtrace_lock);
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void __show_backtrace(unsigned long fp)
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{
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struct reg_window *rw;
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unsigned long flags;
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int cpu = smp_processor_id();
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spin_lock_irqsave(&sparc_backtrace_lock, flags);
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rw = (struct reg_window *)fp;
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while(rw && (((unsigned long) rw) >= PAGE_OFFSET) &&
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!(((unsigned long) rw) & 0x7)) {
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printk("CPU[%d]: ARGS[%08lx,%08lx,%08lx,%08lx,%08lx,%08lx] "
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"FP[%08lx] CALLER[%08lx]: ", cpu,
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rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
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rw->ins[4], rw->ins[5],
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rw->ins[6],
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rw->ins[7]);
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print_symbol("%s\n", rw->ins[7]);
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rw = (struct reg_window *) rw->ins[6];
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}
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spin_unlock_irqrestore(&sparc_backtrace_lock, flags);
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}
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#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
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#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
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#define __GET_FP(fp) __asm__ __volatile__("mov %%i6, %0" : "=r" (fp))
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void show_backtrace(void)
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{
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unsigned long fp;
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__SAVE; __SAVE; __SAVE; __SAVE;
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__SAVE; __SAVE; __SAVE; __SAVE;
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__RESTORE; __RESTORE; __RESTORE; __RESTORE;
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__RESTORE; __RESTORE; __RESTORE; __RESTORE;
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__GET_FP(fp);
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__show_backtrace(fp);
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}
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#ifdef CONFIG_SMP
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void smp_show_backtrace_all_cpus(void)
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{
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xc0((smpfunc_t) show_backtrace);
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show_backtrace();
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}
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#endif
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#if 0
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void show_stackframe(struct sparc_stackf *sf)
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{
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unsigned long size;
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unsigned long *stk;
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int i;
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printk("l0: %08lx l1: %08lx l2: %08lx l3: %08lx "
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"l4: %08lx l5: %08lx l6: %08lx l7: %08lx\n",
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sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
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sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
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printk("i0: %08lx i1: %08lx i2: %08lx i3: %08lx "
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"i4: %08lx i5: %08lx fp: %08lx i7: %08lx\n",
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sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
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sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
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printk("sp: %08lx x0: %08lx x1: %08lx x2: %08lx "
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"x3: %08lx x4: %08lx x5: %08lx xx: %08lx\n",
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(unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
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sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
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sf->xxargs[0]);
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size = ((unsigned long)sf->fp) - ((unsigned long)sf);
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size -= STACKFRAME_SZ;
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stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
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i = 0;
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do {
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printk("s%d: %08lx\n", i++, *stk++);
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} while ((size -= sizeof(unsigned long)));
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}
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#endif
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void show_regs(struct pt_regs *r)
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{
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struct reg_window *rw = (struct reg_window *) r->u_regs[14];
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printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n",
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r->psr, r->pc, r->npc, r->y, print_tainted());
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print_symbol("PC: <%s>\n", r->pc);
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printk("%%G: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
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r->u_regs[0], r->u_regs[1], r->u_regs[2], r->u_regs[3],
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r->u_regs[4], r->u_regs[5], r->u_regs[6], r->u_regs[7]);
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printk("%%O: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
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r->u_regs[8], r->u_regs[9], r->u_regs[10], r->u_regs[11],
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r->u_regs[12], r->u_regs[13], r->u_regs[14], r->u_regs[15]);
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print_symbol("RPC: <%s>\n", r->u_regs[15]);
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printk("%%L: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
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rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
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rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
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printk("%%I: %08lx %08lx %08lx %08lx %08lx %08lx %08lx %08lx\n",
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rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
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rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
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}
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/*
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* The show_stack is an external API which we do not use ourselves.
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* The oops is printed in die_if_kernel.
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*/
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void show_stack(struct task_struct *tsk, unsigned long *_ksp)
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{
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unsigned long pc, fp;
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unsigned long task_base;
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struct reg_window *rw;
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int count = 0;
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if (tsk != NULL)
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task_base = (unsigned long) task_stack_page(tsk);
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else
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task_base = (unsigned long) current_thread_info();
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fp = (unsigned long) _ksp;
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do {
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/* Bogus frame pointer? */
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if (fp < (task_base + sizeof(struct thread_info)) ||
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fp >= (task_base + (PAGE_SIZE << 1)))
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break;
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rw = (struct reg_window *) fp;
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pc = rw->ins[7];
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printk("[%08lx : ", pc);
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print_symbol("%s ] ", pc);
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fp = rw->ins[6];
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} while (++count < 16);
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printk("\n");
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}
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void dump_stack(void)
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{
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unsigned long *ksp;
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__asm__ __volatile__("mov %%fp, %0"
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: "=r" (ksp));
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show_stack(current, ksp);
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}
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EXPORT_SYMBOL(dump_stack);
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/*
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* Note: sparc64 has a pretty intricated thread_saved_pc, check it out.
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*/
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unsigned long thread_saved_pc(struct task_struct *tsk)
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{
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return task_thread_info(tsk)->kpc;
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}
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/*
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* Free current thread data structures etc..
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*/
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void exit_thread(void)
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{
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#ifndef CONFIG_SMP
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if(last_task_used_math == current) {
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#else
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if (test_thread_flag(TIF_USEDFPU)) {
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#endif
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/* Keep process from leaving FPU in a bogon state. */
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put_psr(get_psr() | PSR_EF);
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fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
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¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
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#ifndef CONFIG_SMP
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last_task_used_math = NULL;
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#else
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clear_thread_flag(TIF_USEDFPU);
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#endif
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}
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}
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void flush_thread(void)
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{
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current_thread_info()->w_saved = 0;
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/* No new signal delivery by default */
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current->thread.new_signal = 0;
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#ifndef CONFIG_SMP
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if(last_task_used_math == current) {
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#else
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if (test_thread_flag(TIF_USEDFPU)) {
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#endif
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/* Clean the fpu. */
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put_psr(get_psr() | PSR_EF);
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fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
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¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
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#ifndef CONFIG_SMP
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last_task_used_math = NULL;
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#else
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clear_thread_flag(TIF_USEDFPU);
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#endif
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}
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/* Now, this task is no longer a kernel thread. */
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current->thread.current_ds = USER_DS;
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if (current->thread.flags & SPARC_FLAG_KTHREAD) {
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current->thread.flags &= ~SPARC_FLAG_KTHREAD;
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/* We must fixup kregs as well. */
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/* XXX This was not fixed for ti for a while, worked. Unused? */
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current->thread.kregs = (struct pt_regs *)
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(task_stack_page(current) + (THREAD_SIZE - TRACEREG_SZ));
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}
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}
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static __inline__ struct sparc_stackf __user *
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clone_stackframe(struct sparc_stackf __user *dst,
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struct sparc_stackf __user *src)
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{
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unsigned long size, fp;
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struct sparc_stackf *tmp;
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struct sparc_stackf __user *sp;
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if (get_user(tmp, &src->fp))
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return NULL;
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fp = (unsigned long) tmp;
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size = (fp - ((unsigned long) src));
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fp = (unsigned long) dst;
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sp = (struct sparc_stackf __user *)(fp - size);
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/* do_fork() grabs the parent semaphore, we must release it
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* temporarily so we can build the child clone stack frame
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* without deadlocking.
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*/
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if (__copy_user(sp, src, size))
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sp = NULL;
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else if (put_user(fp, &sp->fp))
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sp = NULL;
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return sp;
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}
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asmlinkage int sparc_do_fork(unsigned long clone_flags,
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unsigned long stack_start,
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struct pt_regs *regs,
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unsigned long stack_size)
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{
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unsigned long parent_tid_ptr, child_tid_ptr;
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parent_tid_ptr = regs->u_regs[UREG_I2];
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child_tid_ptr = regs->u_regs[UREG_I4];
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return do_fork(clone_flags, stack_start,
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regs, stack_size,
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(int __user *) parent_tid_ptr,
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(int __user *) child_tid_ptr);
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}
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/* Copy a Sparc thread. The fork() return value conventions
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* under SunOS are nothing short of bletcherous:
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* Parent --> %o0 == childs pid, %o1 == 0
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* Child --> %o0 == parents pid, %o1 == 1
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*
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* NOTE: We have a separate fork kpsr/kwim because
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* the parent could change these values between
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* sys_fork invocation and when we reach here
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* if the parent should sleep while trying to
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* allocate the task_struct and kernel stack in
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* do_fork().
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* XXX See comment above sys_vfork in sparc64. todo.
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*/
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extern void ret_from_fork(void);
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int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
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unsigned long unused,
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struct task_struct *p, struct pt_regs *regs)
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{
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struct thread_info *ti = task_thread_info(p);
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struct pt_regs *childregs;
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char *new_stack;
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#ifndef CONFIG_SMP
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if(last_task_used_math == current) {
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#else
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if (test_thread_flag(TIF_USEDFPU)) {
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#endif
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put_psr(get_psr() | PSR_EF);
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fpsave(&p->thread.float_regs[0], &p->thread.fsr,
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&p->thread.fpqueue[0], &p->thread.fpqdepth);
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#ifdef CONFIG_SMP
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clear_thread_flag(TIF_USEDFPU);
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#endif
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}
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/*
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* p->thread_info new_stack childregs
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* ! ! ! {if(PSR_PS) }
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* V V (stk.fr.) V (pt_regs) { (stk.fr.) }
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* +----- - - - - - ------+===========+============={+==========}+
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*/
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new_stack = task_stack_page(p) + THREAD_SIZE;
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if (regs->psr & PSR_PS)
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new_stack -= STACKFRAME_SZ;
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new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
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memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
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childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
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/*
|
|
* A new process must start with interrupts closed in 2.5,
|
|
* because this is how Mingo's scheduler works (see schedule_tail
|
|
* and finish_arch_switch). If we do not do it, a timer interrupt hits
|
|
* before we unlock, attempts to re-take the rq->lock, and then we die.
|
|
* Thus, kpsr|=PSR_PIL.
|
|
*/
|
|
ti->ksp = (unsigned long) new_stack;
|
|
ti->kpc = (((unsigned long) ret_from_fork) - 0x8);
|
|
ti->kpsr = current->thread.fork_kpsr | PSR_PIL;
|
|
ti->kwim = current->thread.fork_kwim;
|
|
|
|
if(regs->psr & PSR_PS) {
|
|
extern struct pt_regs fake_swapper_regs;
|
|
|
|
p->thread.kregs = &fake_swapper_regs;
|
|
new_stack += STACKFRAME_SZ + TRACEREG_SZ;
|
|
childregs->u_regs[UREG_FP] = (unsigned long) new_stack;
|
|
p->thread.flags |= SPARC_FLAG_KTHREAD;
|
|
p->thread.current_ds = KERNEL_DS;
|
|
memcpy(new_stack, (void *)regs->u_regs[UREG_FP], STACKFRAME_SZ);
|
|
childregs->u_regs[UREG_G6] = (unsigned long) ti;
|
|
} else {
|
|
p->thread.kregs = childregs;
|
|
childregs->u_regs[UREG_FP] = sp;
|
|
p->thread.flags &= ~SPARC_FLAG_KTHREAD;
|
|
p->thread.current_ds = USER_DS;
|
|
|
|
if (sp != regs->u_regs[UREG_FP]) {
|
|
struct sparc_stackf __user *childstack;
|
|
struct sparc_stackf __user *parentstack;
|
|
|
|
/*
|
|
* This is a clone() call with supplied user stack.
|
|
* Set some valid stack frames to give to the child.
|
|
*/
|
|
childstack = (struct sparc_stackf __user *)
|
|
(sp & ~0x7UL);
|
|
parentstack = (struct sparc_stackf __user *)
|
|
regs->u_regs[UREG_FP];
|
|
|
|
#if 0
|
|
printk("clone: parent stack:\n");
|
|
show_stackframe(parentstack);
|
|
#endif
|
|
|
|
childstack = clone_stackframe(childstack, parentstack);
|
|
if (!childstack)
|
|
return -EFAULT;
|
|
|
|
#if 0
|
|
printk("clone: child stack:\n");
|
|
show_stackframe(childstack);
|
|
#endif
|
|
|
|
childregs->u_regs[UREG_FP] = (unsigned long)childstack;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
/* FPU must be disabled on SMP. */
|
|
childregs->psr &= ~PSR_EF;
|
|
#endif
|
|
|
|
/* Set the return value for the child. */
|
|
childregs->u_regs[UREG_I0] = current->pid;
|
|
childregs->u_regs[UREG_I1] = 1;
|
|
|
|
/* Set the return value for the parent. */
|
|
regs->u_regs[UREG_I1] = 0;
|
|
|
|
if (clone_flags & CLONE_SETTLS)
|
|
childregs->u_regs[UREG_G7] = regs->u_regs[UREG_I3];
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* fill in the user structure for a core dump..
|
|
*/
|
|
void dump_thread(struct pt_regs * regs, struct user * dump)
|
|
{
|
|
unsigned long first_stack_page;
|
|
|
|
dump->magic = SUNOS_CORE_MAGIC;
|
|
dump->len = sizeof(struct user);
|
|
dump->regs.psr = regs->psr;
|
|
dump->regs.pc = regs->pc;
|
|
dump->regs.npc = regs->npc;
|
|
dump->regs.y = regs->y;
|
|
/* fuck me plenty */
|
|
memcpy(&dump->regs.regs[0], ®s->u_regs[1], (sizeof(unsigned long) * 15));
|
|
dump->uexec = current->thread.core_exec;
|
|
dump->u_tsize = (((unsigned long) current->mm->end_code) -
|
|
((unsigned long) current->mm->start_code)) & ~(PAGE_SIZE - 1);
|
|
dump->u_dsize = ((unsigned long) (current->mm->brk + (PAGE_SIZE-1)));
|
|
dump->u_dsize -= dump->u_tsize;
|
|
dump->u_dsize &= ~(PAGE_SIZE - 1);
|
|
first_stack_page = (regs->u_regs[UREG_FP] & ~(PAGE_SIZE - 1));
|
|
dump->u_ssize = (TASK_SIZE - first_stack_page) & ~(PAGE_SIZE - 1);
|
|
memcpy(&dump->fpu.fpstatus.fregs.regs[0], ¤t->thread.float_regs[0], (sizeof(unsigned long) * 32));
|
|
dump->fpu.fpstatus.fsr = current->thread.fsr;
|
|
dump->fpu.fpstatus.flags = dump->fpu.fpstatus.extra = 0;
|
|
dump->fpu.fpstatus.fpq_count = current->thread.fpqdepth;
|
|
memcpy(&dump->fpu.fpstatus.fpq[0], ¤t->thread.fpqueue[0],
|
|
((sizeof(unsigned long) * 2) * 16));
|
|
dump->sigcode = 0;
|
|
}
|
|
|
|
/*
|
|
* fill in the fpu structure for a core dump.
|
|
*/
|
|
int dump_fpu (struct pt_regs * regs, elf_fpregset_t * fpregs)
|
|
{
|
|
if (used_math()) {
|
|
memset(fpregs, 0, sizeof(*fpregs));
|
|
fpregs->pr_q_entrysize = 8;
|
|
return 1;
|
|
}
|
|
#ifdef CONFIG_SMP
|
|
if (test_thread_flag(TIF_USEDFPU)) {
|
|
put_psr(get_psr() | PSR_EF);
|
|
fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
|
|
¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
|
|
if (regs != NULL) {
|
|
regs->psr &= ~(PSR_EF);
|
|
clear_thread_flag(TIF_USEDFPU);
|
|
}
|
|
}
|
|
#else
|
|
if (current == last_task_used_math) {
|
|
put_psr(get_psr() | PSR_EF);
|
|
fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
|
|
¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
|
|
if (regs != NULL) {
|
|
regs->psr &= ~(PSR_EF);
|
|
last_task_used_math = NULL;
|
|
}
|
|
}
|
|
#endif
|
|
memcpy(&fpregs->pr_fr.pr_regs[0],
|
|
¤t->thread.float_regs[0],
|
|
(sizeof(unsigned long) * 32));
|
|
fpregs->pr_fsr = current->thread.fsr;
|
|
fpregs->pr_qcnt = current->thread.fpqdepth;
|
|
fpregs->pr_q_entrysize = 8;
|
|
fpregs->pr_en = 1;
|
|
if(fpregs->pr_qcnt != 0) {
|
|
memcpy(&fpregs->pr_q[0],
|
|
¤t->thread.fpqueue[0],
|
|
sizeof(struct fpq) * fpregs->pr_qcnt);
|
|
}
|
|
/* Zero out the rest. */
|
|
memset(&fpregs->pr_q[fpregs->pr_qcnt], 0,
|
|
sizeof(struct fpq) * (32 - fpregs->pr_qcnt));
|
|
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;
|
|
|
|
/* 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 == 0) {
|
|
task_lock(current);
|
|
current->ptrace &= ~PT_DTRACE;
|
|
task_unlock(current);
|
|
}
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
__asm__ __volatile__("mov %4, %%g2\n\t" /* Set aside fn ptr... */
|
|
"mov %5, %%g3\n\t" /* and arg. */
|
|
"mov %1, %%g1\n\t"
|
|
"mov %2, %%o0\n\t" /* Clone flags. */
|
|
"mov 0, %%o1\n\t" /* usp arg == 0 */
|
|
"t 0x10\n\t" /* Linux/Sparc clone(). */
|
|
"cmp %%o1, 0\n\t"
|
|
"be 1f\n\t" /* The parent, just return. */
|
|
" nop\n\t" /* Delay slot. */
|
|
"jmpl %%g2, %%o7\n\t" /* Call the function. */
|
|
" mov %%g3, %%o0\n\t" /* Get back the arg in delay. */
|
|
"mov %3, %%g1\n\t"
|
|
"t 0x10\n\t" /* Linux/Sparc exit(). */
|
|
/* Notreached by child. */
|
|
"1: mov %%o0, %0\n\t" :
|
|
"=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;
|
|
}
|
|
|
|
unsigned long get_wchan(struct task_struct *task)
|
|
{
|
|
unsigned long pc, fp, bias = 0;
|
|
unsigned long task_base = (unsigned long) task;
|
|
unsigned long ret = 0;
|
|
struct reg_window *rw;
|
|
int count = 0;
|
|
|
|
if (!task || task == current ||
|
|
task->state == TASK_RUNNING)
|
|
goto out;
|
|
|
|
fp = task_thread_info(task)->ksp + bias;
|
|
do {
|
|
/* Bogus frame pointer? */
|
|
if (fp < (task_base + sizeof(struct thread_info)) ||
|
|
fp >= (task_base + (2 * PAGE_SIZE)))
|
|
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;
|
|
}
|
|
|