Merge commit 'v2.6.34' into next

1 files changed, 72 insertions, 87 deletions

diff --git a/arch/sparc/lib/mcount.S b/arch/sparc/lib/mcount.S
index 24b8b12deed2..3ad6cbdc2163 100644
--- a/arch/sparc/lib/mcount.S
+++ b/arch/sparc/lib/mcount.S
@@ -7,26 +7,11 @@
 
 #include <linux/linkage.h>
 
-#include <asm/ptrace.h>
-#include <asm/thread_info.h>
-
 /*
  * This is the main variant and is called by C code.  GCC's -pg option
  * automatically instruments every C function with a call to this.
  */
 
-#ifdef CONFIG_STACK_DEBUG
-
-#define OVSTACKSIZE	4096		/* lets hope this is enough */
-
-	.data
-	.align		8
-panicstring:
-	.asciz		"Stack overflow\n"
-	.align		8
-ovstack:
-	.skip		OVSTACKSIZE
-#endif
 	.text
 	.align		32
 	.globl		_mcount
@@ -35,84 +20,48 @@ ovstack:
 	.type		mcount,#function
 _mcount:
 mcount:
-#ifdef CONFIG_STACK_DEBUG
-	/*
-	 * Check whether %sp is dangerously low.
-	 */
-	ldub		[%g6 + TI_FPDEPTH], %g1
-	srl		%g1, 1, %g3
-	add		%g3, 1, %g3
-	sllx		%g3, 8, %g3			! each fpregs frame is 256b
-	add		%g3, 192, %g3
-	add		%g6, %g3, %g3			! where does task_struct+frame end?
-	sub		%g3, STACK_BIAS, %g3
-	cmp		%sp, %g3
-	bg,pt		%xcc, 1f
-	 nop
-	lduh		[%g6 + TI_CPU], %g1
-	sethi		%hi(hardirq_stack), %g3
-	or		%g3, %lo(hardirq_stack), %g3
-	sllx		%g1, 3, %g1
-	ldx		[%g3 + %g1], %g7
-	sub		%g7, STACK_BIAS, %g7
-	cmp		%sp, %g7
-	bleu,pt		%xcc, 2f
-	 sethi		%hi(THREAD_SIZE), %g3
-	add		%g7, %g3, %g7
-	cmp		%sp, %g7
-	blu,pn		%xcc, 1f
-2:	 sethi		%hi(softirq_stack), %g3
-	or		%g3, %lo(softirq_stack), %g3
-	ldx		[%g3 + %g1], %g7
-	sub		%g7, STACK_BIAS, %g7
-	cmp		%sp, %g7
-	bleu,pt		%xcc, 3f
-	 sethi		%hi(THREAD_SIZE), %g3
-	add		%g7, %g3, %g7
-	cmp		%sp, %g7
-	blu,pn		%xcc, 1f
-	 nop
-	/* If we are already on ovstack, don't hop onto it
-	 * again, we are already trying to output the stack overflow
-	 * message.
-	 */
-3:	sethi		%hi(ovstack), %g7		! cant move to panic stack fast enough
-	 or		%g7, %lo(ovstack), %g7
-	add		%g7, OVSTACKSIZE, %g3
-	sub		%g3, STACK_BIAS + 192, %g3
-	sub		%g7, STACK_BIAS, %g7
-	cmp		%sp, %g7
-	blu,pn		%xcc, 2f
-	 cmp		%sp, %g3
-	bleu,pn		%xcc, 1f
-	 nop
-2:	mov		%g3, %sp
-	sethi		%hi(panicstring), %g3
-	call		prom_printf
-	 or		%g3, %lo(panicstring), %o0
-	call		prom_halt
-	 nop
-1:
-#endif
 #ifdef CONFIG_FUNCTION_TRACER
 #ifdef CONFIG_DYNAMIC_FTRACE
-	mov		%o7, %o0
-	.globl		mcount_call
-mcount_call:
-	call		ftrace_stub
-	 mov		%o0, %o7
+	/* Do nothing, the retl/nop below is all we need.  */
 #else
-	sethi		%hi(ftrace_trace_function), %g1
+	sethi		%hi(function_trace_stop), %g1
+	lduw		[%g1 + %lo(function_trace_stop)], %g2
+	brnz,pn		%g2, 2f
+	 sethi		%hi(ftrace_trace_function), %g1
 	sethi		%hi(ftrace_stub), %g2
 	ldx		[%g1 + %lo(ftrace_trace_function)], %g1
 	or		%g2, %lo(ftrace_stub), %g2
 	cmp		%g1, %g2
 	be,pn		%icc, 1f
-	 mov		%i7, %o1
-	jmpl		%g1, %g0
-	 mov		%o7, %o0
+	 mov		%i7, %g3
+	save		%sp, -176, %sp
+	mov		%g3, %o1
+	jmpl		%g1, %o7
+	 mov		%i7, %o0
+	ret
+	 restore
 	/* not reached */
 1:
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+	sethi		%hi(ftrace_graph_return), %g1
+	ldx		[%g1 + %lo(ftrace_graph_return)], %g3
+	cmp		%g2, %g3
+	bne,pn		%xcc, 5f
+	 sethi		%hi(ftrace_graph_entry_stub), %g2
+	sethi		%hi(ftrace_graph_entry), %g1
+	or		%g2, %lo(ftrace_graph_entry_stub), %g2
+	ldx		[%g1 + %lo(ftrace_graph_entry)], %g1
+	cmp		%g1, %g2
+	be,pt		%xcc, 2f
+	 nop
+5:	mov		%i7, %g2
+	mov		%fp, %g3
+	save		%sp, -176, %sp
+	mov		%g2, %l0
+	ba,pt		%xcc, ftrace_graph_caller
+	 mov		%g3, %l1
+#endif
+2:
 #endif
 #endif
 	retl
@@ -131,14 +80,50 @@ ftrace_stub:
 	.globl		ftrace_caller
 	.type		ftrace_caller,#function
 ftrace_caller:
-	mov		%i7, %o1
-	mov		%o7, %o0
+	sethi		%hi(function_trace_stop), %g1
+	mov		%i7, %g2
+	lduw		[%g1 + %lo(function_trace_stop)], %g1
+	brnz,pn		%g1, ftrace_stub
+	 mov		%fp, %g3
+	save		%sp, -176, %sp
+	mov		%g2, %o1
+	mov		%g2, %l0
+	mov		%g3, %l1
 	.globl		ftrace_call
 ftrace_call:
 	call		ftrace_stub
-	 mov		%o0, %o7
-	retl
+	 mov		%i7, %o0
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+	.globl		ftrace_graph_call
+ftrace_graph_call:
+	call		ftrace_stub
 	 nop
+#endif
+	ret
+	 restore
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+	.size		ftrace_graph_call,.-ftrace_graph_call
+#endif
+	.size		ftrace_call,.-ftrace_call
 	.size		ftrace_caller,.-ftrace_caller
 #endif
 #endif
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ENTRY(ftrace_graph_caller)
+	mov		%l0, %o0
+	mov		%i7, %o1
+	call		prepare_ftrace_return
+	 mov		%l1, %o2
+	ret
+	 restore	%o0, -8, %i7
+END(ftrace_graph_caller)
+
+ENTRY(return_to_handler)
+	save		%sp, -176, %sp
+	call		ftrace_return_to_handler
+	 mov		%fp, %o0
+	jmpl		%o0 + 8, %g0
+	 restore
+END(return_to_handler)
+#endif