Commit 9956c112 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  sparc64: Prevent stack backtrace false positives on trap frames.
  sparc64: Fix stack tracing through trap frames.
  sparc64: Fix kernel thread stack termination.
  sunhv: Fix locking in non-paged I/O case.
parents 78b58e54 ada44a04
......@@ -657,20 +657,39 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
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;
/* Calculate offset to stack_frame & pt_regs */
child_trap_frame = task_stack_page(p) + (THREAD_SIZE - (TRACEREG_SZ+STACKFRAME_SZ));
memcpy(child_trap_frame, (((struct sparc_stackf *)regs)-1), (TRACEREG_SZ+STACKFRAME_SZ));
kernel_thread = (regs->tstate & TSTATE_PRIV) ? 1 : 0;
parent_sf = ((struct sparc_stackf *) regs) - 1;
t->flags = (t->flags & ~((0xffUL << TI_FLAG_CWP_SHIFT) | (0xffUL << TI_FLAG_CURRENT_DS_SHIFT))) |
/* 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->kregs = (struct pt_regs *) (child_trap_frame +
sizeof(struct sparc_stackf));
t->fpsaved[0] = 0;
if (regs->tstate & TSTATE_PRIV) {
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 (via KMOD, NFS, or similar) we must
* disable performance counters in the child because the
......@@ -681,12 +700,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
t->pcr_reg = 0;
t->flags &= ~_TIF_PERFCTR;
}
t->kregs->u_regs[UREG_FP] = t->ksp;
t->flags |= ((long)ASI_P << TI_FLAG_CURRENT_DS_SHIFT);
flush_register_windows();
memcpy((void *)(t->ksp + STACK_BIAS),
(void *)(regs->u_regs[UREG_FP] + STACK_BIAS),
sizeof(struct sparc_stackf));
t->kregs->u_regs[UREG_G6] = (unsigned long) t;
t->kregs->u_regs[UREG_G4] = (unsigned long) t->task;
} else {
......
......@@ -363,6 +363,7 @@ kern_rtt: rdpr %canrestore, %g1
brz,pn %g1, kern_rtt_fill
nop
kern_rtt_restore:
stw %g0, [%sp + PTREGS_OFF + PT_V9_MAGIC]
restore
retry
......
......@@ -19,7 +19,7 @@ void save_stack_trace(struct stack_trace *trace)
fp = ksp + STACK_BIAS;
thread_base = (unsigned long) tp;
do {
struct reg_window *rw;
struct sparc_stackf *sf;
struct pt_regs *regs;
unsigned long pc;
......@@ -28,15 +28,17 @@ void save_stack_trace(struct stack_trace *trace)
fp >= (thread_base + THREAD_SIZE))
break;
rw = (struct reg_window *) fp;
regs = (struct pt_regs *) (rw + 1);
sf = (struct sparc_stackf *) fp;
regs = (struct pt_regs *) (sf + 1);
if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
if (!(regs->tstate & TSTATE_PRIV))
break;
pc = regs->tpc;
fp = regs->u_regs[UREG_I6] + STACK_BIAS;
} else {
pc = rw->ins[7];
fp = rw->ins[6] + STACK_BIAS;
pc = sf->callers_pc;
fp = (unsigned long)sf->fp + STACK_BIAS;
}
if (trace->skip > 0)
......
......@@ -2116,7 +2116,7 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
printk("\n");
#endif
do {
struct reg_window *rw;
struct sparc_stackf *sf;
struct pt_regs *regs;
unsigned long pc;
......@@ -2124,15 +2124,17 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
if (fp < (thread_base + sizeof(struct thread_info)) ||
fp >= (thread_base + THREAD_SIZE))
break;
rw = (struct reg_window *)fp;
regs = (struct pt_regs *) (rw + 1);
sf = (struct sparc_stackf *) fp;
regs = (struct pt_regs *) (sf + 1);
if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
if (!(regs->tstate & TSTATE_PRIV))
break;
pc = regs->tpc;
fp = regs->u_regs[UREG_I6] + STACK_BIAS;
} else {
pc = rw->ins[7];
fp = rw->ins[6] + STACK_BIAS;
pc = sf->callers_pc;
fp = (unsigned long)sf->fp + STACK_BIAS;
}
printk(" [%016lx] ", pc);
......
......@@ -499,7 +499,6 @@ static void sunhv_console_write_bychar(struct console *con, const char *s, unsig
} else
spin_lock(&port->lock);
spin_lock_irqsave(&port->lock, flags);
for (i = 0; i < n; i++) {
if (*s == '\n')
sunhv_console_putchar(port, '\r');
......
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