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linux/arch/sparc/lib/mcount.S

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
/*
* Copyright (C) 2000 Anton Blanchard (anton@linuxcare.com)
*
* This file implements mcount(), which is used to collect profiling data.
* This can also be tweaked for kernel stack overflow detection.
*/
#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
sparc64: add ftrace support. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-05-14 09:06:59 +04:00
.align 32
.globl _mcount
.type _mcount,#function
.globl mcount
.type mcount,#function
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
_mcount:
sparc64: add ftrace support. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-05-14 09:06:59 +04:00
mcount:
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
#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
sparc64: Fix recursion in stack overflow detection handling. The calls down into prom_printf() when we detect an overflowed stack can recurse again since the overflow stack will be "below" the current kernel stack limit. Prevent this by just returning straight if we are on the stack overflow safe stack already. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-12 13:03:49 +04:00
nop
sparc64: Implement IRQ stacks. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-13 05:33:56 +04:00
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
sparc64: Fix stack debugging IRQ stack regression. Commit 4f70f7a91bffdcc39f088748dc678953eb9a3fbd (sparc64: Implement IRQ stacks.) has two bugs. First, the softirq range check forgets to subtract STACK_BIAS before comparing with %sp. Next, on failure the wrong label is jumped to, resulting in a bogus stack being loaded. Reported-by: Igor Kovalenko <igor.v.kovalenko@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-09 12:43:45 +03:00
sub %g7, STACK_BIAS, %g7
sparc64: Implement IRQ stacks. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-13 05:33:56 +04:00
cmp %sp, %g7
sparc64: Fix stack debugging IRQ stack regression. Commit 4f70f7a91bffdcc39f088748dc678953eb9a3fbd (sparc64: Implement IRQ stacks.) has two bugs. First, the softirq range check forgets to subtract STACK_BIAS before comparing with %sp. Next, on failure the wrong label is jumped to, resulting in a bogus stack being loaded. Reported-by: Igor Kovalenko <igor.v.kovalenko@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-09 12:43:45 +03:00
bleu,pt %xcc, 3f
sparc64: Implement IRQ stacks. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-13 05:33:56 +04:00
sethi %hi(THREAD_SIZE), %g3
add %g7, %g3, %g7
cmp %sp, %g7
blu,pn %xcc, 1f
nop
sparc64: Fix recursion in stack overflow detection handling. The calls down into prom_printf() when we detect an overflowed stack can recurse again since the overflow stack will be "below" the current kernel stack limit. Prevent this by just returning straight if we are on the stack overflow safe stack already. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-12 13:03:49 +04:00
/* If we are already on ovstack, don't hop onto it
* again, we are already trying to output the stack overflow
* message.
*/
sparc64: Fix stack debugging IRQ stack regression. Commit 4f70f7a91bffdcc39f088748dc678953eb9a3fbd (sparc64: Implement IRQ stacks.) has two bugs. First, the softirq range check forgets to subtract STACK_BIAS before comparing with %sp. Next, on failure the wrong label is jumped to, resulting in a bogus stack being loaded. Reported-by: Igor Kovalenko <igor.v.kovalenko@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-09 12:43:45 +03:00
3: sethi %hi(ovstack), %g7 ! cant move to panic stack fast enough
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
or %g7, %lo(ovstack), %g7
sparc64: Fix recursion in stack overflow detection handling. The calls down into prom_printf() when we detect an overflowed stack can recurse again since the overflow stack will be "below" the current kernel stack limit. Prevent this by just returning straight if we are on the stack overflow safe stack already. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-12 13:03:49 +04:00
add %g7, OVSTACKSIZE, %g3
sub %g3, STACK_BIAS + 192, %g3
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
sub %g7, STACK_BIAS, %g7
sparc64: Fix recursion in stack overflow detection handling. The calls down into prom_printf() when we detect an overflowed stack can recurse again since the overflow stack will be "below" the current kernel stack limit. Prevent this by just returning straight if we are on the stack overflow safe stack already. Signed-off-by: David S. Miller <davem@davemloft.net>
2008-08-12 13:03:49 +04:00
cmp %sp, %g7
blu,pn %xcc, 2f
cmp %sp, %g3
bleu,pn %xcc, 1f
nop
2: mov %g3, %sp
sethi %hi(panicstring), %g3
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
call prom_printf
or %g3, %lo(panicstring), %o0
call prom_halt
nop
sparc64: add ftrace support. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-05-14 09:06:59 +04:00
1:
#endif
ftrace: rename FTRACE to FUNCTION_TRACER Due to confusion between the ftrace infrastructure and the gcc profiling tracer "ftrace", this patch renames the config options from FTRACE to FUNCTION_TRACER. The other two names that are offspring from FTRACE DYNAMIC_FTRACE and FTRACE_MCOUNT_RECORD will stay the same. This patch was generated mostly by script, and partially by hand. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-07 03:06:12 +04:00
#ifdef CONFIG_FUNCTION_TRACER
sparc64: add ftrace support. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-05-14 09:06:59 +04:00
#ifdef CONFIG_DYNAMIC_FTRACE
mov %o7, %o0
.globl mcount_call
mcount_call:
call ftrace_stub
mov %o0, %o7
#else
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
/* not reached */
1:
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
#endif
sparc64: add ftrace support. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-05-14 09:06:59 +04:00
#endif
retl
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
nop
sparc64: add ftrace support. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-05-14 09:06:59 +04:00
.size _mcount,.-_mcount
.size mcount,.-mcount
ftrace: rename FTRACE to FUNCTION_TRACER Due to confusion between the ftrace infrastructure and the gcc profiling tracer "ftrace", this patch renames the config options from FTRACE to FUNCTION_TRACER. The other two names that are offspring from FTRACE DYNAMIC_FTRACE and FTRACE_MCOUNT_RECORD will stay the same. This patch was generated mostly by script, and partially by hand. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2008-10-07 03:06:12 +04:00
#ifdef CONFIG_FUNCTION_TRACER
sparc64: add ftrace support. Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2008-05-14 09:06:59 +04:00
.globl ftrace_stub
.type ftrace_stub,#function
ftrace_stub:
retl
nop
.size ftrace_stub,.-ftrace_stub
#ifdef CONFIG_DYNAMIC_FTRACE
.globl ftrace_caller
.type ftrace_caller,#function
ftrace_caller:
mov %i7, %o1
mov %o7, %o0
.globl ftrace_call
ftrace_call:
call ftrace_stub
mov %o0, %o7
retl
nop
.size ftrace_caller,.-ftrace_caller
#endif
#endif
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