File: [Development] / linux-2.4-xfs / arch / sparc / kernel / process.c (download)
Revision 1.3, Wed Apr 13 15:13:51 2005 UTC (12 years, 6 months ago) by nathans.longdrop.melbourne.sgi.com
Branch: MAIN
CVS Tags: HEAD
Changes since 1.2: +5 -0
lines
Merge up to 2.4.30
Merge of 2.4.x-xfs-melb:linux:22159a by kenmcd.
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/* $Id: process.c,v 1.158 2001/11/26 23:45:00 davem Exp $
* linux/arch/sparc/kernel/process.c
*
* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
*/
/*
* This file handles the architecture-dependent parts of process handling..
*/
#define __KERNEL_SYSCALLS__
#include <stdarg.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/config.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <asm/auxio.h>
#include <asm/oplib.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/delay.h>
#include <asm/processor.h>
#include <asm/psr.h>
#include <asm/elf.h>
/*
* Power management idle function
* Set in pm platform drivers
*/
void (*pm_idle)(void);
/*
* Power-off handler instantiation for pm.h compliance
* This is done via auxio, but could be used as a fallback
* handler when auxio is not present-- unused for now...
*/
void (*pm_power_off)(void);
/*
* sysctl - toggle power-off restriction for serial console
* systems in machine_power_off()
*/
int scons_pwroff = 1;
extern void fpsave(unsigned long *, unsigned long *, void *, unsigned long *);
struct task_struct *last_task_used_math = NULL;
struct task_struct *current_set[NR_CPUS] = {&init_task, };
#ifndef CONFIG_SMP
#define SUN4C_FAULT_HIGH 100
/*
* the idle loop on a Sparc... ;)
*/
int cpu_idle(void)
{
int ret = -EPERM;
if (current->pid != 0)
goto out;
/* endless idle loop with no priority at all */
current->nice = 20;
current->counter = -100;
init_idle();
for (;;) {
if (ARCH_SUN4C_SUN4) {
static int count = HZ;
static unsigned long last_jiffies;
static unsigned long last_faults;
static unsigned long fps;
unsigned long now;
unsigned long faults;
unsigned long flags;
extern unsigned long sun4c_kernel_faults;
extern void sun4c_grow_kernel_ring(void);
save_and_cli(flags);
now = jiffies;
count -= (now - last_jiffies);
last_jiffies = now;
if (count < 0) {
count += HZ;
faults = sun4c_kernel_faults;
fps = (fps + (faults - last_faults)) >> 1;
last_faults = faults;
#if 0
printk("kernel faults / second = %ld\n", fps);
#endif
if (fps >= SUN4C_FAULT_HIGH) {
sun4c_grow_kernel_ring();
}
}
restore_flags(flags);
}
while((!current->need_resched) && pm_idle) {
(*pm_idle)();
}
schedule();
check_pgt_cache();
}
ret = 0;
out:
return ret;
}
#else
/* This is being executed in task 0 'user space'. */
int cpu_idle(void)
{
/* endless idle loop with no priority at all */
current->nice = 20;
current->counter = -100;
init_idle();
while(1) {
if(current->need_resched) {
schedule();
check_pgt_cache();
}
barrier(); /* or else gcc optimizes... */
}
}
#endif
extern char reboot_command [];
extern int serial_console;
#ifdef CONFIG_SUN_CONSOLE
extern void (*prom_palette)(int);
#endif
void machine_halt(void)
{
sti();
mdelay(8);
cli();
#ifdef CONFIG_SUN_CONSOLE
if (!serial_console && prom_palette)
prom_palette (1);
#endif
prom_halt();
panic("Halt failed!");
}
void machine_restart(char * cmd)
{
char *p;
sti();
mdelay(8);
cli();
p = strchr (reboot_command, '\n');
if (p) *p = 0;
#ifdef CONFIG_SUN_CONSOLE
if (!serial_console && prom_palette)
prom_palette (1);
#endif
if (cmd)
prom_reboot(cmd);
if (*reboot_command)
prom_reboot(reboot_command);
prom_feval ("reset");
panic("Reboot failed!");
}
void machine_power_off(void)
{
#ifdef CONFIG_SUN_AUXIO
if (auxio_power_register && (!serial_console || scons_pwroff))
*auxio_power_register |= AUXIO_POWER_OFF;
#endif
machine_halt();
}
void show_regwindow(struct reg_window *rw)
{
printk("l0: %08lx l1: %08lx l2: %08lx l3: %08lx "
"l4: %08lx l5: %08lx l6: %08lx l7: %08lx\n",
rw->locals[0], rw->locals[1], rw->locals[2], rw->locals[3],
rw->locals[4], rw->locals[5], rw->locals[6], rw->locals[7]);
printk("i0: %08lx i1: %08lx i2: %08lx i3: %08lx "
"i4: %08lx i5: %08lx fp: %08lx i7: %08lx\n",
rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
rw->ins[4], rw->ins[5], rw->ins[6], rw->ins[7]);
}
static spinlock_t sparc_backtrace_lock = SPIN_LOCK_UNLOCKED;
void __show_backtrace(unsigned long fp)
{
struct reg_window *rw;
unsigned long flags;
int cpu = smp_processor_id();
spin_lock_irqsave(&sparc_backtrace_lock, flags);
rw = (struct reg_window *)fp;
while(rw && (((unsigned long) rw) >= PAGE_OFFSET) &&
!(((unsigned long) rw) & 0x7)) {
printk("CPU[%d]: ARGS[%08lx,%08lx,%08lx,%08lx,%08lx,%08lx] "
"FP[%08lx] CALLER[%08lx]\n", cpu,
rw->ins[0], rw->ins[1], rw->ins[2], rw->ins[3],
rw->ins[4], rw->ins[5],
rw->ins[6],
rw->ins[7]);
rw = (struct reg_window *) rw->ins[6];
}
spin_unlock_irqrestore(&sparc_backtrace_lock, flags);
}
#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
#define __GET_FP(fp) __asm__ __volatile__("mov %%i6, %0" : "=r" (fp))
void show_backtrace(void)
{
unsigned long fp;
__SAVE; __SAVE; __SAVE; __SAVE;
__SAVE; __SAVE; __SAVE; __SAVE;
__RESTORE; __RESTORE; __RESTORE; __RESTORE;
__RESTORE; __RESTORE; __RESTORE; __RESTORE;
__GET_FP(fp);
__show_backtrace(fp);
}
#ifdef CONFIG_SMP
void smp_show_backtrace_all_cpus(void)
{
xc0((smpfunc_t) show_backtrace);
show_backtrace();
}
#endif
void show_stackframe(struct sparc_stackf *sf)
{
unsigned long size;
unsigned long *stk;
int i;
printk("l0: %08lx l1: %08lx l2: %08lx l3: %08lx "
"l4: %08lx l5: %08lx l6: %08lx l7: %08lx\n",
sf->locals[0], sf->locals[1], sf->locals[2], sf->locals[3],
sf->locals[4], sf->locals[5], sf->locals[6], sf->locals[7]);
printk("i0: %08lx i1: %08lx i2: %08lx i3: %08lx "
"i4: %08lx i5: %08lx fp: %08lx i7: %08lx\n",
sf->ins[0], sf->ins[1], sf->ins[2], sf->ins[3],
sf->ins[4], sf->ins[5], (unsigned long)sf->fp, sf->callers_pc);
printk("sp: %08lx x0: %08lx x1: %08lx x2: %08lx "
"x3: %08lx x4: %08lx x5: %08lx xx: %08lx\n",
(unsigned long)sf->structptr, sf->xargs[0], sf->xargs[1],
sf->xargs[2], sf->xargs[3], sf->xargs[4], sf->xargs[5],
sf->xxargs[0]);
size = ((unsigned long)sf->fp) - ((unsigned long)sf);
size -= STACKFRAME_SZ;
stk = (unsigned long *)((unsigned long)sf + STACKFRAME_SZ);
i = 0;
do {
printk("s%d: %08lx\n", i++, *stk++);
} while ((size -= sizeof(unsigned long)));
}
void show_regs(struct pt_regs * regs)
{
printk("PSR: %08lx PC: %08lx NPC: %08lx Y: %08lx %s\n", regs->psr,
regs->pc, regs->npc, regs->y, print_tainted());
printk("g0: %08lx g1: %08lx g2: %08lx g3: %08lx ",
regs->u_regs[0], regs->u_regs[1], regs->u_regs[2],
regs->u_regs[3]);
printk("g4: %08lx g5: %08lx g6: %08lx g7: %08lx\n",
regs->u_regs[4], regs->u_regs[5], regs->u_regs[6],
regs->u_regs[7]);
printk("o0: %08lx o1: %08lx o2: %08lx o3: %08lx ",
regs->u_regs[8], regs->u_regs[9], regs->u_regs[10],
regs->u_regs[11]);
printk("o4: %08lx o5: %08lx sp: %08lx o7: %08lx\n",
regs->u_regs[12], regs->u_regs[13], regs->u_regs[14],
regs->u_regs[15]);
show_regwindow((struct reg_window *)regs->u_regs[14]);
}
void show_trace_task(struct task_struct *tsk)
{
unsigned long pc, fp;
unsigned long task_base = (unsigned long) tsk;
struct reg_window *rw;
int count = 0;
if (!tsk)
return;
fp = tsk->thread.ksp;
do {
/* Bogus frame pointer? */
if (fp < (task_base + sizeof(struct task_struct)) ||
fp >= (task_base + (PAGE_SIZE << 1)))
break;
rw = (struct reg_window *) fp;
pc = rw->ins[7];
printk("[%08lx] ", pc);
fp = rw->ins[6];
} while (++count < 16);
printk("\n");
}
/*
* Free current thread data structures etc..
*/
void exit_thread(void)
{
#ifndef CONFIG_SMP
if(last_task_used_math == current) {
#else
if(current->flags & PF_USEDFPU) {
#endif
/* Keep process from leaving FPU in a bogon state. */
put_psr(get_psr() | PSR_EF);
fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
#ifndef CONFIG_SMP
last_task_used_math = NULL;
#else
current->flags &= ~PF_USEDFPU;
#endif
}
}
void flush_thread(void)
{
current->thread.w_saved = 0;
/* No new signal delivery by default */
current->thread.new_signal = 0;
#ifndef CONFIG_SMP
if(last_task_used_math == current) {
#else
if(current->flags & PF_USEDFPU) {
#endif
/* Clean the fpu. */
put_psr(get_psr() | PSR_EF);
fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
#ifndef CONFIG_SMP
last_task_used_math = NULL;
#else
current->flags &= ~PF_USEDFPU;
#endif
}
/* Now, this task is no longer a kernel thread. */
current->thread.current_ds = USER_DS;
if (current->thread.flags & SPARC_FLAG_KTHREAD) {
current->thread.flags &= ~SPARC_FLAG_KTHREAD;
/* We must fixup kregs as well. */
current->thread.kregs = (struct pt_regs *)
(((unsigned long)current) +
(TASK_UNION_SIZE - TRACEREG_SZ));
}
}
static __inline__ struct sparc_stackf *
clone_stackframe(struct sparc_stackf *dst, struct sparc_stackf *src)
{
unsigned long size;
struct sparc_stackf *sp;
size = ((unsigned long)src->fp) - ((unsigned long)src);
sp = (struct sparc_stackf *)(((unsigned long)dst) - size);
/* do_fork() grabs the parent semaphore, we must release it
* temporarily so we can build the child clone stack frame
* without deadlocking.
*/
if (copy_to_user(sp, src, size))
sp = (struct sparc_stackf *) 0;
else if (put_user(dst, &sp->fp))
sp = (struct sparc_stackf *) 0;
return sp;
}
/* 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
*
* NOTE: We have a separate fork kpsr/kwim because
* the parent could change these values between
* sys_fork invocation and when we reach here
* if the parent should sleep while trying to
* allocate the task_struct and kernel stack in
* do_fork().
*/
extern void ret_from_fork(void);
int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
unsigned long unused,
struct task_struct *p, struct pt_regs *regs)
{
struct pt_regs *childregs;
char *new_stack;
#ifndef CONFIG_SMP
if(last_task_used_math == current) {
#else
if(current->flags & PF_USEDFPU) {
#endif
put_psr(get_psr() | PSR_EF);
fpsave(&p->thread.float_regs[0], &p->thread.fsr,
&p->thread.fpqueue[0], &p->thread.fpqdepth);
#ifdef CONFIG_SMP
current->flags &= ~PF_USEDFPU;
#endif
}
/*
* p new_stack childregs
* ! ! ! {if(PSR_PS) }
* V V (stk.fr.) V (pt_regs) { (stk.fr.) }
* +----- - - - - - ------+===========+============={+==========}+
*/
new_stack = (char*)p + TASK_UNION_SIZE;
if (regs->psr & PSR_PS)
new_stack -= STACKFRAME_SZ;
new_stack -= STACKFRAME_SZ + TRACEREG_SZ;
memcpy(new_stack, (char *)regs - STACKFRAME_SZ, STACKFRAME_SZ + TRACEREG_SZ);
childregs = (struct pt_regs *) (new_stack + STACKFRAME_SZ);
p->thread.ksp = (unsigned long) new_stack;
p->thread.kpc = (((unsigned long) ret_from_fork) - 0x8);
p->thread.kpsr = current->thread.fork_kpsr;
p->thread.kwim = current->thread.fork_kwim;
/* This is used for sun4c only */
atomic_set(&p->thread.refcount, 1);
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) p;
} 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 *childstack;
struct sparc_stackf *parentstack;
/*
* This is a clone() call with supplied user stack.
* Set some valid stack frames to give to the child.
*/
childstack = (struct sparc_stackf *) (sp & ~0x7UL);
parentstack = (struct sparc_stackf *) 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;
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 (current->used_math == 0) {
memset(fpregs, 0, sizeof(*fpregs));
fpregs->pr_q_entrysize = 8;
return 1;
}
#ifdef CONFIG_SMP
if (current->flags & PF_USEDFPU) {
put_psr(get_psr() | PSR_EF);
fpsave(¤t->thread.float_regs[0], ¤t->thread.fsr,
¤t->thread.fpqueue[0], ¤t->thread.fpqdepth);
regs->psr &= ~(PSR_EF);
current->flags &= ~(PF_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);
last_task_used_math = 0;
regs->psr &= ~(PSR_EF);
}
#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 *)regs->u_regs[base + UREG_I0]);
error = PTR_ERR(filename);
if(IS_ERR(filename))
goto out;
error = do_execve(filename, (char **) regs->u_regs[base + UREG_I1],
(char **) regs->u_regs[base + UREG_I2], regs);
putname(filename);
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 free'd until both the parent and the child have exited.
*/
pid_t arch_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),
"i" (__NR_exit), "r" (fn), "r" (arg) :
"g1", "g2", "g3", "o0", "o1", "memory", "cc");
return retval;
}
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