Commit 890e3dc8 authored by Heiko Carstens's avatar Heiko Carstens
Browse files

ftrace/samples: add s390 support for ftrace direct multi sample 

Add s390 architecture support for the ftrace direct multi sample.
See commit 5fae941b ("ftrace/samples: Add multi direct interface
test module") for further details.

Link: https://lore.kernel.org/r/20211115195614.3173346-3-hca@linux.ibm.com


Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
parent 503e4510

arch/s390/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -194,6 +194,7 @@ config S390 
	select HAVE_RELIABLE_STACKTRACE

	select HAVE_RSEQ

	select HAVE_SAMPLE_FTRACE_DIRECT

	select HAVE_SAMPLE_FTRACE_DIRECT_MULTI

	select HAVE_SOFTIRQ_ON_OWN_STACK

	select HAVE_SYSCALL_TRACEPOINTS

	select HAVE_VIRT_CPU_ACCOUNTING

samples/ftrace/ftrace-direct-multi.c

+30 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 
#include <linux/mm.h> /* for handle_mm_fault() */

#include <linux/ftrace.h>

#include <linux/sched/stat.h>

#include <asm/asm-offsets.h>



extern void my_direct_func(unsigned long ip);
@@ -14,6 +15,8 @@ void my_direct_func(unsigned long ip) 


extern void my_tramp(void *);



#ifdef CONFIG_X86_64



asm (

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

"	.type		my_tramp, @function\n"
@@ -31,6 +34,33 @@ 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"

"	lgr		%r2,%r0\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 struct ftrace_ops direct;



static int __init ftrace_direct_multi_init(void)