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-rw-r--r--arch/sparc/lib/mcount.S159
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 @@
7 7
8#include <linux/linkage.h> 8#include <linux/linkage.h>
9 9
10#include <asm/ptrace.h>
11#include <asm/thread_info.h>
12
13/* 10/*
14 * This is the main variant and is called by C code. GCC's -pg option 11 * This is the main variant and is called by C code. GCC's -pg option
15 * automatically instruments every C function with a call to this. 12 * automatically instruments every C function with a call to this.
16 */ 13 */
17 14
18#ifdef CONFIG_STACK_DEBUG
19
20#define OVSTACKSIZE 4096 /* lets hope this is enough */
21
22 .data
23 .align 8
24panicstring:
25 .asciz "Stack overflow\n"
26 .align 8
27ovstack:
28 .skip OVSTACKSIZE
29#endif
30 .text 15 .text
31 .align 32 16 .align 32
32 .globl _mcount 17 .globl _mcount
@@ -35,84 +20,48 @@ ovstack:
35 .type mcount,#function 20 .type mcount,#function
36_mcount: 21_mcount:
37mcount: 22mcount:
38#ifdef CONFIG_STACK_DEBUG
39 /*
40 * Check whether %sp is dangerously low.
41 */
42 ldub [%g6 + TI_FPDEPTH], %g1
43 srl %g1, 1, %g3
44 add %g3, 1, %g3
45 sllx %g3, 8, %g3 ! each fpregs frame is 256b
46 add %g3, 192, %g3
47 add %g6, %g3, %g3 ! where does task_struct+frame end?
48 sub %g3, STACK_BIAS, %g3
49 cmp %sp, %g3
50 bg,pt %xcc, 1f
51 nop
52 lduh [%g6 + TI_CPU], %g1
53 sethi %hi(hardirq_stack), %g3
54 or %g3, %lo(hardirq_stack), %g3
55 sllx %g1, 3, %g1
56 ldx [%g3 + %g1], %g7
57 sub %g7, STACK_BIAS, %g7
58 cmp %sp, %g7
59 bleu,pt %xcc, 2f
60 sethi %hi(THREAD_SIZE), %g3
61 add %g7, %g3, %g7
62 cmp %sp, %g7
63 blu,pn %xcc, 1f
642: sethi %hi(softirq_stack), %g3
65 or %g3, %lo(softirq_stack), %g3
66 ldx [%g3 + %g1], %g7
67 sub %g7, STACK_BIAS, %g7
68 cmp %sp, %g7
69 bleu,pt %xcc, 3f
70 sethi %hi(THREAD_SIZE), %g3
71 add %g7, %g3, %g7
72 cmp %sp, %g7
73 blu,pn %xcc, 1f
74 nop
75 /* If we are already on ovstack, don't hop onto it
76 * again, we are already trying to output the stack overflow
77 * message.
78 */
793: sethi %hi(ovstack), %g7 ! cant move to panic stack fast enough
80 or %g7, %lo(ovstack), %g7
81 add %g7, OVSTACKSIZE, %g3
82 sub %g3, STACK_BIAS + 192, %g3
83 sub %g7, STACK_BIAS, %g7
84 cmp %sp, %g7
85 blu,pn %xcc, 2f
86 cmp %sp, %g3
87 bleu,pn %xcc, 1f
88 nop
892: mov %g3, %sp
90 sethi %hi(panicstring), %g3
91 call prom_printf
92 or %g3, %lo(panicstring), %o0
93 call prom_halt
94 nop
951:
96#endif
97#ifdef CONFIG_FUNCTION_TRACER 23#ifdef CONFIG_FUNCTION_TRACER
98#ifdef CONFIG_DYNAMIC_FTRACE 24#ifdef CONFIG_DYNAMIC_FTRACE
99 mov %o7, %o0 25 /* Do nothing, the retl/nop below is all we need. */
100 .globl mcount_call
101mcount_call:
102 call ftrace_stub
103 mov %o0, %o7
104#else 26#else
105 sethi %hi(ftrace_trace_function), %g1 27 sethi %hi(function_trace_stop), %g1
28 lduw [%g1 + %lo(function_trace_stop)], %g2
29 brnz,pn %g2, 2f
30 sethi %hi(ftrace_trace_function), %g1
106 sethi %hi(ftrace_stub), %g2 31 sethi %hi(ftrace_stub), %g2
107 ldx [%g1 + %lo(ftrace_trace_function)], %g1 32 ldx [%g1 + %lo(ftrace_trace_function)], %g1
108 or %g2, %lo(ftrace_stub), %g2 33 or %g2, %lo(ftrace_stub), %g2
109 cmp %g1, %g2 34 cmp %g1, %g2
110 be,pn %icc, 1f 35 be,pn %icc, 1f
111 mov %i7, %o1 36 mov %i7, %g3
112 jmpl %g1, %g0 37 save %sp, -176, %sp
113 mov %o7, %o0 38 mov %g3, %o1
39 jmpl %g1, %o7
40 mov %i7, %o0
41 ret
42 restore
114 /* not reached */ 43 /* not reached */
1151: 441:
45#ifdef CONFIG_FUNCTION_GRAPH_TRACER
46 sethi %hi(ftrace_graph_return), %g1
47 ldx [%g1 + %lo(ftrace_graph_return)], %g3
48 cmp %g2, %g3
49 bne,pn %xcc, 5f
50 sethi %hi(ftrace_graph_entry_stub), %g2
51 sethi %hi(ftrace_graph_entry), %g1
52 or %g2, %lo(ftrace_graph_entry_stub), %g2
53 ldx [%g1 + %lo(ftrace_graph_entry)], %g1
54 cmp %g1, %g2
55 be,pt %xcc, 2f
56 nop
575: mov %i7, %g2
58 mov %fp, %g3
59 save %sp, -176, %sp
60 mov %g2, %l0
61 ba,pt %xcc, ftrace_graph_caller
62 mov %g3, %l1
63#endif
642:
116#endif 65#endif
117#endif 66#endif
118 retl 67 retl
@@ -131,14 +80,50 @@ ftrace_stub:
131 .globl ftrace_caller 80 .globl ftrace_caller
132 .type ftrace_caller,#function 81 .type ftrace_caller,#function
133ftrace_caller: 82ftrace_caller:
134 mov %i7, %o1 83 sethi %hi(function_trace_stop), %g1
135 mov %o7, %o0 84 mov %i7, %g2
85 lduw [%g1 + %lo(function_trace_stop)], %g1
86 brnz,pn %g1, ftrace_stub
87 mov %fp, %g3
88 save %sp, -176, %sp
89 mov %g2, %o1
90 mov %g2, %l0
91 mov %g3, %l1
136 .globl ftrace_call 92 .globl ftrace_call
137ftrace_call: 93ftrace_call:
138 call ftrace_stub 94 call ftrace_stub
139 mov %o0, %o7 95 mov %i7, %o0
140 retl 96#ifdef CONFIG_FUNCTION_GRAPH_TRACER
97 .globl ftrace_graph_call
98ftrace_graph_call:
99 call ftrace_stub
141 nop 100 nop
101#endif
102 ret
103 restore
104#ifdef CONFIG_FUNCTION_GRAPH_TRACER
105 .size ftrace_graph_call,.-ftrace_graph_call
106#endif
107 .size ftrace_call,.-ftrace_call
142 .size ftrace_caller,.-ftrace_caller 108 .size ftrace_caller,.-ftrace_caller
143#endif 109#endif
144#endif 110#endif
111
112#ifdef CONFIG_FUNCTION_GRAPH_TRACER
113ENTRY(ftrace_graph_caller)
114 mov %l0, %o0
115 mov %i7, %o1
116 call prepare_ftrace_return
117 mov %l1, %o2
118 ret
119 restore %o0, -8, %i7
120END(ftrace_graph_caller)
121
122ENTRY(return_to_handler)
123 save %sp, -176, %sp
124 call ftrace_return_to_handler
125 mov %fp, %o0
126 jmpl %o0 + 8, %g0
127 restore
128END(return_to_handler)
129#endif
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