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authorLinus Torvalds <torvalds@linux-foundation.org>2008-05-21 22:00:12 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-21 22:00:12 -0700
commit9956c1120826bce3b42093099a0149b7f62d0b8a (patch)
treeb34de8b27596555be2a84629973d4a692db42c73 /arch
parent78b58e549a3098a8c1408d0214bd25e5d5e7a3a3 (diff)
parentada44a0430fdd00b3f38aad0aa518e97cb760bd0 (diff)
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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.
Diffstat (limited to 'arch')
-rw-r--r--arch/sparc64/kernel/process.c36
-rw-r--r--arch/sparc64/kernel/rtrap.S1
-rw-r--r--arch/sparc64/kernel/stacktrace.c12
-rw-r--r--arch/sparc64/kernel/traps.c12
4 files changed, 40 insertions, 21 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 {
diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S
index 3afacbb5781..c6fc695fe1f 100644
--- a/arch/sparc64/kernel/rtrap.S
+++ b/arch/sparc64/kernel/rtrap.S
@@ -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
diff --git a/arch/sparc64/kernel/stacktrace.c b/arch/sparc64/kernel/stacktrace.c
index 01b52f561af..c73ce3f4197 100644
--- a/arch/sparc64/kernel/stacktrace.c
+++ b/arch/sparc64/kernel/stacktrace.c
@@ -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)
diff --git a/arch/sparc64/kernel/traps.c b/arch/sparc64/kernel/traps.c
index d9b8d46707d..36974926265 100644
--- a/arch/sparc64/kernel/traps.c
+++ b/arch/sparc64/kernel/traps.c
@@ -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);