Commit 1254cfbc authored by Heiko Carstens's avatar Heiko Carstens Committed by Vasily Gorbik
Browse files

samples: add s390 support for ftrace direct call samples 



Add s390 support for ftrace direct call samples, which also enables
ftrace direct call selftests within ftrace selftests.

Acked-by: default avatarIlya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: default avatarSven Schnelle <svens@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Acked-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20211012133802.2460757-5-hca@linux.ibm.com


Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent c316eb44

arch/s390/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -193,6 +193,7 @@ config S390 
	select HAVE_REGS_AND_STACK_ACCESS_API

	select HAVE_RELIABLE_STACKTRACE

	select HAVE_RSEQ

	select HAVE_SAMPLE_FTRACE_DIRECT

	select HAVE_SOFTIRQ_ON_OWN_STACK

	select HAVE_SYSCALL_TRACEPOINTS

	select HAVE_VIRT_CPU_ACCOUNTING

samples/ftrace/ftrace-direct-modify.c

+44 −0
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
#include <linux/module.h>

#include <linux/kthread.h>

#include <linux/ftrace.h>

#include <asm/asm-offsets.h>



void my_direct_func1(void)

{
@@ -18,6 +19,8 @@ extern void my_tramp2(void *); 


static unsigned long my_ip = (unsigned long)schedule;



#ifdef CONFIG_X86_64



asm (

"	.pushsection    .text, \"ax\", @progbits\n"

"	.type		my_tramp1, @function\n"
@@ -41,6 +44,47 @@ asm ( 
"	.popsection\n"

);



#endif /* CONFIG_X86_64 */



#ifdef CONFIG_S390



asm (

"	.pushsection	.text, \"ax\", @progbits\n"

"	.type		my_tramp1, @function\n"

"	.globl		my_tramp1\n"

"   my_tramp1:"

"	lgr		%r1,%r15\n"

"	stmg		%r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"

"	stg		%r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"

"	aghi		%r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"

"	stg		%r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"

"	brasl		%r14,my_direct_func1\n"

"	aghi		%r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"

"	lmg		%r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"

"	lg		%r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"

"	lgr		%r1,%r0\n"

"	br		%r1\n"

"	.size		my_tramp1, .-my_tramp1\n"

"	.type		my_tramp2, @function\n"

"	.globl		my_tramp2\n"

"   my_tramp2:"

"	lgr		%r1,%r15\n"

"	stmg		%r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"

"	stg		%r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"

"	aghi		%r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"

"	stg		%r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"

"	brasl		%r14,my_direct_func2\n"

"	aghi		%r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"

"	lmg		%r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"

"	lg		%r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"

"	lgr		%r1,%r0\n"

"	br		%r1\n"

"	.size		my_tramp2, .-my_tramp2\n"

"	.popsection\n"

);



#endif /* CONFIG_S390 */



static unsigned long my_tramp = (unsigned long)my_tramp1;

static unsigned long tramps[2] = {

	(unsigned long)my_tramp1,

samples/ftrace/ftrace-direct-too.c

+28 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 


#include <linux/mm.h> /* for handle_mm_fault() */

#include <linux/ftrace.h>

#include <asm/asm-offsets.h>



void my_direct_func(struct vm_area_struct *vma,

			unsigned long address, unsigned int flags)
@@ -13,6 +14,8 @@ void my_direct_func(struct vm_area_struct *vma, 


extern void my_tramp(void *);



#ifdef CONFIG_X86_64



asm (

"	.pushsection    .text, \"ax\", @progbits\n"

"	.type		my_tramp, @function\n"
@@ -33,6 +36,31 @@ asm ( 
"	.popsection\n"

);



#endif /* CONFIG_X86_64 */



#ifdef CONFIG_S390



asm (

"	.pushsection	.text, \"ax\", @progbits\n"

"	.type		my_tramp, @function\n"

"	.globl		my_tramp\n"

"   my_tramp:"

"	lgr		%r1,%r15\n"

"	stmg		%r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"

"	stg		%r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"

"	aghi		%r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"

"	stg		%r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"

"	brasl		%r14,my_direct_func\n"

"	aghi		%r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"

"	lmg		%r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"

"	lg		%r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"

"	lgr		%r1,%r0\n"

"	br		%r1\n"

"	.size		my_tramp, .-my_tramp\n"

"	.popsection\n"

);



#endif /* CONFIG_S390 */



static int __init ftrace_direct_init(void)

{

samples/ftrace/ftrace-direct.c

+28 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 


#include <linux/sched.h> /* for wake_up_process() */

#include <linux/ftrace.h>

#include <asm/asm-offsets.h>



void my_direct_func(struct task_struct *p)

{
@@ -11,6 +12,8 @@ void my_direct_func(struct task_struct *p) 


extern void my_tramp(void *);



#ifdef CONFIG_X86_64



asm (

"	.pushsection    .text, \"ax\", @progbits\n"

"	.type		my_tramp, @function\n"
@@ -27,6 +30,31 @@ asm ( 
"	.popsection\n"

);



#endif /* CONFIG_X86_64 */



#ifdef CONFIG_S390



asm (

"	.pushsection	.text, \"ax\", @progbits\n"

"	.type		my_tramp, @function\n"

"	.globl		my_tramp\n"

"   my_tramp:"

"	lgr		%r1,%r15\n"

"	stmg		%r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"

"	stg		%r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"

"	aghi		%r15,"__stringify(-STACK_FRAME_OVERHEAD)"\n"

"	stg		%r1,"__stringify(__SF_BACKCHAIN)"(%r15)\n"

"	brasl		%r14,my_direct_func\n"

"	aghi		%r15,"__stringify(STACK_FRAME_OVERHEAD)"\n"

"	lmg		%r0,%r5,"__stringify(__SF_GPRS)"(%r15)\n"

"	lg		%r14,"__stringify(__SF_GPRS+8*8)"(%r15)\n"

"	lgr		%r1,%r0\n"

"	br		%r1\n"

"	.size		my_tramp, .-my_tramp\n"

"	.popsection\n"

);



#endif /* CONFIG_S390 */



static int __init ftrace_direct_init(void)

{