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| author | Heiko Carstens <hca@linux.ibm.com> | 2021-11-15 20:56:14 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2021-11-18 17:50:54 +0100 |
| commit | 890e3dc8bb6ee630870560c34054692f7a45da42 (patch) | |
| tree | 78d33aa57937f04caf3ac922573a3bba2bd21847 /samples/ftrace/ftrace-direct-multi.c | |
| parent | 503e45108451dd4227c6f15c52ba459c29a86840 (diff) | |
| download | lwn-890e3dc8bb6ee630870560c34054692f7a45da42.tar.gz lwn-890e3dc8bb6ee630870560c34054692f7a45da42.zip | |
ftrace/samples: add s390 support for ftrace direct multi sample
Add s390 architecture support for the ftrace direct multi sample.
See commit 5fae941b9a6f ("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: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'samples/ftrace/ftrace-direct-multi.c')
| -rw-r--r-- | samples/ftrace/ftrace-direct-multi.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/samples/ftrace/ftrace-direct-multi.c b/samples/ftrace/ftrace-direct-multi.c index b6d7806b400e..2fafc9afcbf0 100644 --- a/samples/ftrace/ftrace-direct-multi.c +++ b/samples/ftrace/ftrace-direct-multi.c @@ -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) |