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sh: Fix up stack overflow check with ftrace disabled.

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Presently the STACK_CHECK() code is called in to multiple times, although
it's only necessary from the mcount entry. The code still attempts to
treat the nop case as an ftrace path resulting in superfluous code flow
for the case where ftrace is disabled. And finally, this also fixes up
references to a few undefined symbols when FUNCTION_TRACER=n.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2009-07-11 21:06:53 +09:00
parent a470b95e99
commit e460ab27b6
1 changed files with 40 additions and 36 deletions
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76
arch/sh/lib/mcount.S
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@ -1,7 +1,7 @@
/*
* arch/sh/lib/mcount.S
*
* Copyright (C) 2008 Paul Mundt
* Copyright (C) 2008, 2009 Paul Mundt
* Copyright (C) 2008, 2009 Matt Fleming
*
* This file is subject to the terms and conditions of the GNU General Public
@ -86,13 +86,18 @@
.type mcount,@function
_mcount:
mcount:
STACK_CHECK()
#ifndef CONFIG_FUNCTION_TRACER
rts
nop
#else
#ifndef CONFIG_DYNAMIC_FTRACE
mov.l .Lfunction_trace_stop, r0
mov.l @r0, r0
tst r0, r0
bf ftrace_stub
#endif
STACK_CHECK()
MCOUNT_ENTER()
@ -174,8 +179,6 @@ ftrace_caller:
tst r0, r0
bf ftrace_stub
STACK_CHECK()
MCOUNT_ENTER()
.globl ftrace_call
@ -211,38 +214,6 @@ ftrace_stub:
rts
nop
#ifdef CONFIG_STACK_DEBUG
.globl stack_panic
stack_panic:
mov.l .Ldump_stack, r0
jsr @r0
nop
mov.l .Lpanic, r0
jsr @r0
mov.l .Lpanic_s, r4
rts
nop
.align 2
.L_ebss:
.long _ebss
.L_init_thread_union:
.long init_thread_union
.Lpanic:
.long panic
.Lpanic_s:
.long .Lpanic_str
.Ldump_stack:
.long dump_stack
.section .rodata
.align 2
.Lpanic_str:
.string "Stack error"
#endif /* CONFIG_STACK_DEBUG */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
.globl ftrace_graph_caller
ftrace_graph_caller:
@ -304,3 +275,36 @@ return_to_handler:
.Lftrace_return_to_handler:
.long ftrace_return_to_handler
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
#endif /* CONFIG_FUNCTION_TRACER */
#ifdef CONFIG_STACK_DEBUG
.globl stack_panic
stack_panic:
mov.l .Ldump_stack, r0
jsr @r0
nop
mov.l .Lpanic, r0
jsr @r0
mov.l .Lpanic_s, r4
rts
nop
.align 2
.L_ebss:
.long _ebss
.L_init_thread_union:
.long init_thread_union
.Lpanic:
.long panic
.Lpanic_s:
.long .Lpanic_str
.Ldump_stack:
.long dump_stack
.section .rodata
.align 2
.Lpanic_str:
.string "Stack error"
#endif /* CONFIG_STACK_DEBUG */