291 lines
5.3 KiB
ArmAsm
291 lines
5.3 KiB
ArmAsm
/*
|
|
* arch/sh/lib/mcount.S
|
|
*
|
|
* 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
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#include <asm/ftrace.h>
|
|
#include <asm/thread_info.h>
|
|
#include <asm/asm-offsets.h>
|
|
|
|
#define MCOUNT_ENTER() \
|
|
mov.l r4, @-r15; \
|
|
mov.l r5, @-r15; \
|
|
mov.l r6, @-r15; \
|
|
mov.l r7, @-r15; \
|
|
sts.l pr, @-r15; \
|
|
\
|
|
mov.l @(20,r15),r4; \
|
|
sts pr, r5
|
|
|
|
#define MCOUNT_LEAVE() \
|
|
lds.l @r15+, pr; \
|
|
mov.l @r15+, r7; \
|
|
mov.l @r15+, r6; \
|
|
mov.l @r15+, r5; \
|
|
rts; \
|
|
mov.l @r15+, r4
|
|
|
|
#ifdef CONFIG_STACK_DEBUG
|
|
/*
|
|
* Perform diagnostic checks on the state of the kernel stack.
|
|
*
|
|
* Check for stack overflow. If there is less than 1KB free
|
|
* then it has overflowed.
|
|
*
|
|
* Make sure the stack pointer contains a valid address. Valid
|
|
* addresses for kernel stacks are anywhere after the bss
|
|
* (after __bss_stop) and anywhere in init_thread_union (init_stack).
|
|
*/
|
|
#define STACK_CHECK() \
|
|
mov #(THREAD_SIZE >> 10), r0; \
|
|
shll8 r0; \
|
|
shll2 r0; \
|
|
\
|
|
/* r1 = sp & (THREAD_SIZE - 1) */ \
|
|
mov #-1, r1; \
|
|
add r0, r1; \
|
|
and r15, r1; \
|
|
\
|
|
mov #TI_SIZE, r3; \
|
|
mov #(STACK_WARN >> 8), r2; \
|
|
shll8 r2; \
|
|
add r3, r2; \
|
|
\
|
|
/* Is the stack overflowing? */ \
|
|
cmp/hi r2, r1; \
|
|
bf stack_panic; \
|
|
\
|
|
/* If sp > __bss_stop then we're OK. */ \
|
|
mov.l .L_ebss, r1; \
|
|
cmp/hi r1, r15; \
|
|
bt 1f; \
|
|
\
|
|
/* If sp < init_stack, we're not OK. */ \
|
|
mov.l .L_init_thread_union, r1; \
|
|
cmp/hs r1, r15; \
|
|
bf stack_panic; \
|
|
\
|
|
/* If sp > init_stack && sp < __bss_stop, not OK. */ \
|
|
add r0, r1; \
|
|
cmp/hs r1, r15; \
|
|
bt stack_panic; \
|
|
1:
|
|
#else
|
|
#define STACK_CHECK()
|
|
#endif /* CONFIG_STACK_DEBUG */
|
|
|
|
.align 2
|
|
.globl _mcount
|
|
.type _mcount,@function
|
|
.globl mcount
|
|
.type mcount,@function
|
|
_mcount:
|
|
mcount:
|
|
STACK_CHECK()
|
|
|
|
#ifndef CONFIG_FUNCTION_TRACER
|
|
rts
|
|
nop
|
|
#else
|
|
MCOUNT_ENTER()
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
.globl mcount_call
|
|
mcount_call:
|
|
mov.l .Lftrace_stub, r6
|
|
#else
|
|
mov.l .Lftrace_trace_function, r6
|
|
mov.l ftrace_stub, r7
|
|
cmp/eq r6, r7
|
|
bt skip_trace
|
|
mov.l @r6, r6
|
|
#endif
|
|
|
|
jsr @r6
|
|
nop
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
mov.l .Lftrace_graph_return, r6
|
|
mov.l .Lftrace_stub, r7
|
|
cmp/eq r6, r7
|
|
bt 1f
|
|
|
|
mov.l .Lftrace_graph_caller, r0
|
|
jmp @r0
|
|
nop
|
|
|
|
1:
|
|
mov.l .Lftrace_graph_entry, r6
|
|
mov.l .Lftrace_graph_entry_stub, r7
|
|
cmp/eq r6, r7
|
|
bt skip_trace
|
|
|
|
mov.l .Lftrace_graph_caller, r0
|
|
jmp @r0
|
|
nop
|
|
|
|
.align 2
|
|
.Lftrace_graph_return:
|
|
.long ftrace_graph_return
|
|
.Lftrace_graph_entry:
|
|
.long ftrace_graph_entry
|
|
.Lftrace_graph_entry_stub:
|
|
.long ftrace_graph_entry_stub
|
|
.Lftrace_graph_caller:
|
|
.long ftrace_graph_caller
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
|
|
|
.globl skip_trace
|
|
skip_trace:
|
|
MCOUNT_LEAVE()
|
|
|
|
.align 2
|
|
.Lftrace_trace_function:
|
|
.long ftrace_trace_function
|
|
|
|
#ifdef CONFIG_DYNAMIC_FTRACE
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
/*
|
|
* NOTE: Do not move either ftrace_graph_call or ftrace_caller
|
|
* as this will affect the calculation of GRAPH_INSN_OFFSET.
|
|
*/
|
|
.globl ftrace_graph_call
|
|
ftrace_graph_call:
|
|
mov.l .Lskip_trace, r0
|
|
jmp @r0
|
|
nop
|
|
|
|
.align 2
|
|
.Lskip_trace:
|
|
.long skip_trace
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
|
|
|
.globl ftrace_caller
|
|
ftrace_caller:
|
|
MCOUNT_ENTER()
|
|
|
|
.globl ftrace_call
|
|
ftrace_call:
|
|
mov.l .Lftrace_stub, r6
|
|
jsr @r6
|
|
nop
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
bra ftrace_graph_call
|
|
nop
|
|
#else
|
|
MCOUNT_LEAVE()
|
|
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
|
|
#endif /* CONFIG_DYNAMIC_FTRACE */
|
|
|
|
.align 2
|
|
|
|
/*
|
|
* NOTE: From here on the locations of the .Lftrace_stub label and
|
|
* ftrace_stub itself are fixed. Adding additional data here will skew
|
|
* the displacement for the memory table and break the block replacement.
|
|
* Place new labels either after the ftrace_stub body, or before
|
|
* ftrace_caller. You have been warned.
|
|
*/
|
|
.Lftrace_stub:
|
|
.long ftrace_stub
|
|
|
|
.globl ftrace_stub
|
|
ftrace_stub:
|
|
rts
|
|
nop
|
|
|
|
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
|
|
.globl ftrace_graph_caller
|
|
ftrace_graph_caller:
|
|
mov.l 2f, r1
|
|
jmp @r1
|
|
nop
|
|
1:
|
|
/*
|
|
* MCOUNT_ENTER() pushed 5 registers onto the stack, so
|
|
* the stack address containing our return address is
|
|
* r15 + 20.
|
|
*/
|
|
mov #20, r0
|
|
add r15, r0
|
|
mov r0, r4
|
|
|
|
mov.l .Lprepare_ftrace_return, r0
|
|
jsr @r0
|
|
nop
|
|
|
|
MCOUNT_LEAVE()
|
|
|
|
.align 2
|
|
2: .long skip_trace
|
|
.Lprepare_ftrace_return:
|
|
.long prepare_ftrace_return
|
|
|
|
.globl return_to_handler
|
|
return_to_handler:
|
|
/*
|
|
* Save the return values.
|
|
*/
|
|
mov.l r0, @-r15
|
|
mov.l r1, @-r15
|
|
|
|
mov #0, r4
|
|
|
|
mov.l .Lftrace_return_to_handler, r0
|
|
jsr @r0
|
|
nop
|
|
|
|
/*
|
|
* The return value from ftrace_return_handler has the real
|
|
* address that we should return to.
|
|
*/
|
|
lds r0, pr
|
|
mov.l @r15+, r1
|
|
rts
|
|
mov.l @r15+, r0
|
|
|
|
|
|
.align 2
|
|
.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_init_thread_union:
|
|
.long init_thread_union
|
|
.L_ebss:
|
|
.long __bss_stop
|
|
.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 */
|