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Diffstat (limited to 'arch/sparc64/kernel')
-rw-r--r--arch/sparc64/kernel/process.c36
1 files changed, 25 insertions, 11 deletions
diff --git a/arch/sparc64/kernel/process.c b/arch/sparc64/kernel/process.c
index 0a0c05fc3a3..2084f81a76e 100644
--- a/arch/sparc64/kernel/process.c
+++ b/arch/sparc64/kernel/process.c
@@ -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 {