Merge branch 'master' into export-slabh

3 files changed, 83 insertions, 0 deletions

diff --git a/arch/sparc/kernel/helpers.S b/arch/sparc/kernel/helpers.S
index 314dd0c9fc5b..92090cc9e829 100644
--- a/arch/sparc/kernel/helpers.S
+++ b/arch/sparc/kernel/helpers.S
@@ -46,6 +46,81 @@ stack_trace_flush:
 	 nop
 	.size		stack_trace_flush,.-stack_trace_flush
 
+#ifdef CONFIG_PERF_EVENTS
+	.globl		perf_arch_fetch_caller_regs
+	.type		perf_arch_fetch_caller_regs,#function
+perf_arch_fetch_caller_regs:
+	/* We always read the %pstate into %o5 since we will use
+	 * that to construct a fake %tstate to store into the regs.
+	 */
+	rdpr		%pstate, %o5
+	brz,pn		%o2, 50f
+	 mov		%o2, %g7
+
+	/* Turn off interrupts while we walk around the register
+	 * window by hand.
+	 */
+	wrpr		%o5, PSTATE_IE, %pstate
+
+	/* The %canrestore tells us how many register windows are
+	 * still live in the chip above us, past that we have to
+	 * walk the frame as saved on the stack.   We stash away
+	 * the %cwp in %g1 so we can return back to the original
+	 * register window.
+	 */
+	rdpr		%cwp, %g1
+	rdpr		%canrestore, %g2
+	sub		%g1, 1, %g3
+
+	/* We have the skip count in %g7, if it hits zero then
+	 * %fp/%i7 are the registers we need.  Otherwise if our
+	 * %canrestore count maintained in %g2 hits zero we have
+	 * to start traversing the stack.
+	 */
+10:	brz,pn		%g2, 4f
+	 sub		%g2, 1, %g2
+	wrpr		%g3, %cwp
+	subcc		%g7, 1, %g7
+	bne,pt		%xcc, 10b
+	 sub		%g3, 1, %g3
+
+	/* We found the values we need in the cpu's register
+	 * windows.
+	 */
+	mov		%fp, %g3
+	ba,pt		%xcc, 3f
+	 mov		%i7, %g2
+
+50:	mov		%fp, %g3
+	ba,pt		%xcc, 2f
+	 mov		%i7, %g2
+
+	/* We hit the end of the valid register windows in the
+	 * cpu, start traversing the stack frame.
+	 */
+4:	mov		%fp, %g3
+
+20:	ldx		[%g3 + STACK_BIAS + RW_V9_I7], %g2
+	subcc		%g7, 1, %g7
+	bne,pn		%xcc, 20b
+	 ldx		[%g3 + STACK_BIAS + RW_V9_I6], %g3
+
+	/* Restore the current register window position and
+	 * re-enable interrupts.
+	 */
+3:	wrpr		%g1, %cwp
+	wrpr		%o5, %pstate
+
+2:	stx		%g3, [%o0 + PT_V9_FP]
+	sllx		%o5, 8, %o5
+	stx		%o5, [%o0 + PT_V9_TSTATE]
+	stx		%g2, [%o0 + PT_V9_TPC]
+	add		%g2, 4, %g2
+	retl
+	 stx		%g2, [%o0 + PT_V9_TNPC]
+	.size		perf_arch_fetch_caller_regs,.-perf_arch_fetch_caller_regs
+#endif /* CONFIG_PERF_EVENTS */
+
 #ifdef CONFIG_SMP
 	.globl		hard_smp_processor_id
 	.type		hard_smp_processor_id,#function
diff --git a/arch/sparc/kernel/ptrace_32.c b/arch/sparc/kernel/ptrace_32.c
index 7e3dfd9bb97e..e608f397e11f 100644
--- a/arch/sparc/kernel/ptrace_32.c
+++ b/arch/sparc/kernel/ptrace_32.c
@@ -65,6 +65,7 @@ static int genregs32_get(struct task_struct *target,
 			*k++ = regs->u_regs[pos++];
 
 		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
+		reg_window -= 16;
 		for (; count > 0 && pos < 32; count--) {
 			if (get_user(*k++, &reg_window[pos++]))
 				return -EFAULT;
@@ -76,6 +77,7 @@ static int genregs32_get(struct task_struct *target,
 		}
 
 		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
+		reg_window -= 16;
 		for (; count > 0 && pos < 32; count--) {
 			if (get_user(reg, &reg_window[pos++]) ||
 			    put_user(reg, u++))
@@ -141,6 +143,7 @@ static int genregs32_set(struct task_struct *target,
 			regs->u_regs[pos++] = *k++;
 
 		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
+		reg_window -= 16;
 		for (; count > 0 && pos < 32; count--) {
 			if (put_user(*k++, &reg_window[pos++]))
 				return -EFAULT;
@@ -153,6 +156,7 @@ static int genregs32_set(struct task_struct *target,
 		}
 
 		reg_window = (unsigned long __user *) regs->u_regs[UREG_I6];
+		reg_window -= 16;
 		for (; count > 0 && pos < 32; count--) {
 			if (get_user(reg, u++) ||
 			    put_user(reg, &reg_window[pos++]))
diff --git a/arch/sparc/kernel/ptrace_64.c b/arch/sparc/kernel/ptrace_64.c
index 2f6524d1a817..aa90da08bf61 100644
--- a/arch/sparc/kernel/ptrace_64.c
+++ b/arch/sparc/kernel/ptrace_64.c
@@ -492,6 +492,7 @@ static int genregs32_get(struct task_struct *target,
 			*k++ = regs->u_regs[pos++];
 
 		reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
+		reg_window -= 16;
 		if (target == current) {
 			for (; count > 0 && pos < 32; count--) {
 				if (get_user(*k++, &reg_window[pos++]))
@@ -516,6 +517,7 @@ static int genregs32_get(struct task_struct *target,
 		}
 
 		reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
+		reg_window -= 16;
 		if (target == current) {
 			for (; count > 0 && pos < 32; count--) {
 				if (get_user(reg, &reg_window[pos++]) ||
@@ -599,6 +601,7 @@ static int genregs32_set(struct task_struct *target,
 			regs->u_regs[pos++] = *k++;
 
 		reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
+		reg_window -= 16;
 		if (target == current) {
 			for (; count > 0 && pos < 32; count--) {
 				if (put_user(*k++, &reg_window[pos++]))
@@ -625,6 +628,7 @@ static int genregs32_set(struct task_struct *target,
 		}
 
 		reg_window = (compat_ulong_t __user *) regs->u_regs[UREG_I6];
+		reg_window -= 16;
 		if (target == current) {
 			for (; count > 0 && pos < 32; count--) {
 				if (get_user(reg, u++) ||