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Commit d05f5f99 authored by David Miller's avatar David Miller Committed by Thomas Gleixner
Browse files

sparc64: add ftrace support. 



Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent aa5e5cea

arch/sparc64/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ config SPARC 
config SPARC64

	bool

	default y

	select HAVE_FTRACE

	select HAVE_IDE

	select HAVE_LMB

	select HAVE_ARCH_KGDB

arch/sparc64/Kconfig.debug

+1 −1
Original line number Diff line number Diff line
@@ -33,7 +33,7 @@ config DEBUG_PAGEALLOC 


config MCOUNT

	bool

	depends on STACK_DEBUG

	depends on STACK_DEBUG || FTRACE

	default y



config FRAME_POINTER

arch/sparc64/kernel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ obj-y := process.o setup.o cpu.o idprom.o \ 
		   power.o sbus.o sparc64_ksyms.o chmc.o \

		   visemul.o prom.o of_device.o hvapi.o sstate.o mdesc.o



obj-$(CONFIG_DYNAMIC_FTRACE) += ftrace.o

obj-$(CONFIG_STACKTRACE) += stacktrace.o

obj-$(CONFIG_PCI)	 += ebus.o pci_common.o \

			    pci_psycho.o pci_sabre.o pci_schizo.o \

arch/sparc64/kernel/ftrace.c

0 → 100644
+99 −0
Original line number Diff line number Diff line 
#include <linux/spinlock.h>

#include <linux/hardirq.h>

#include <linux/ftrace.h>

#include <linux/percpu.h>

#include <linux/init.h>

#include <linux/list.h>



static const u32 ftrace_nop = 0x01000000;



notrace int ftrace_ip_converted(unsigned long ip)

{

	u32 insn = *(u32 *) ip;



	return (insn == ftrace_nop);

}



notrace unsigned char *ftrace_nop_replace(void)

{

	return (char *)&ftrace_nop;

}



notrace unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr)

{

	static u32 call;

	s32 off;



	off = ((s32)addr - (s32)ip);

	call = 0x40000000 | ((u32)off >> 2);



	return (unsigned char *) &call;

}



notrace int

ftrace_modify_code(unsigned long ip, unsigned char *old_code,

		   unsigned char *new_code)

{

	u32 old = *(u32 *)old_code;

	u32 new = *(u32 *)new_code;

	u32 replaced;

	int faulted;



	__asm__ __volatile__(

	"1:	cas	[%[ip]], %[old], %[new]\n"

	"	flush	%[ip]\n"

	"	mov	0, %[faulted]\n"

	"2:\n"

	"	.section .fixup,#alloc,#execinstr\n"

	"	.align	4\n"

	"3:	sethi	%%hi(2b), %[faulted]\n"

	"	jmpl	%[faulted] + %%lo(2b), %%g0\n"

	"	 mov	1, %[faulted]\n"

	"	.previous\n"

	"	.section __ex_table,\"a\"\n"

	"	.align	4\n"

	"	.word	1b, 3b\n"

	"	.previous\n"

	: "=r" (replaced), [faulted] "=r" (faulted)

	: [new] "0" (new), [old] "r" (old), [ip] "r" (ip)

	: "memory");



	if (replaced != old && replaced != new)

		faulted = 2;



	return faulted;

}



notrace int ftrace_update_ftrace_func(ftrace_func_t func)

{

	unsigned long ip = (unsigned long)(&ftrace_call);

	unsigned char old[4], *new;



	memcpy(old, &ftrace_call, 4);

	new = ftrace_call_replace(ip, (unsigned long)func);

	return ftrace_modify_code(ip, old, new);

}



notrace int ftrace_mcount_set(unsigned long *data)

{

	unsigned long ip = (long)(&mcount_call);

	unsigned long *addr = data;

	unsigned char old[4], *new;



	/*

	 * Replace the mcount stub with a pointer to the

	 * ip recorder function.

	 */

	memcpy(old, &mcount_call, 4);

	new = ftrace_call_replace(ip, *addr);

	*addr = ftrace_modify_code(ip, old, new);



	return 0;

}





int __init ftrace_dyn_arch_init(void *data)

{

	ftrace_mcount_set(data);

	return 0;

}

arch/sparc64/lib/mcount.S

+54 −4
Original line number Diff line number Diff line
@@ -29,9 +29,12 @@ ovstack: 
#endif

	.text

	.align		32

	.globl mcount, _mcount

mcount:

	.globl		_mcount

	.type		_mcount,#function

	.globl		mcount

	.type		mcount,#function

_mcount:

mcount:

#ifdef CONFIG_STACK_DEBUG

	/*

	 * Check whether %sp is dangerously low.
@@ -55,6 +58,53 @@ _mcount: 
	 or		%g3, %lo(panicstring), %o0

	call		prom_halt

	 nop

1:

#endif

#ifdef CONFIG_FTRACE

#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:

#endif

1:	retl

#endif

	retl

	 nop

	.size		_mcount,.-_mcount

	.size		mcount,.-mcount



#ifdef CONFIG_FTRACE

	.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