Commit 2a713f04 authored by Thomas Weißschuh's avatar Thomas Weißschuh Committed by Johannes Berg
Browse files

um/ptrace: Implement HAVE_SYSCALL_TRACEPOINTS 



Implement syscall tracepoints through the generic tracing infrastructure.

Signed-off-by: default avatarThomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: default avatarNam Cao <namcao@linutronix.de>
Link: https://patch.msgid.link/20250703-uml-have_syscall_tracepoints-v1-2-23c1d3808578@linutronix.de


Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 32a15664

arch/um/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ config UML 
	select HAVE_RUST

	select ARCH_HAS_UBSAN

	select HAVE_ARCH_TRACEHOOK

	select HAVE_SYSCALL_TRACEPOINTS

	select THREAD_INFO_IN_TASK



config MMU

arch/um/include/asm/thread_info.h

+2 −0
Original line number Diff line number Diff line
@@ -43,6 +43,8 @@ struct thread_info { 
#define TIF_NOTIFY_RESUME	8

#define TIF_SECCOMP		9	/* secure computing */

#define TIF_SINGLESTEP		10	/* single stepping userspace */

#define TIF_SYSCALL_TRACEPOINT	11	/* syscall tracepoint instrumentation */





#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)

#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)

arch/um/kernel/ptrace.c

+9 −0
Original line number Diff line number Diff line
@@ -9,6 +9,9 @@ 
#include <linux/uaccess.h>

#include <asm/ptrace-abi.h>



#define CREATE_TRACE_POINTS

#include <trace/events/syscalls.h>



void user_enable_single_step(struct task_struct *child)

{

	set_tsk_thread_flag(child, TIF_SINGLESTEP);
@@ -126,6 +129,9 @@ int syscall_trace_enter(struct pt_regs *regs) 
			    UPT_SYSCALL_ARG3(&regs->regs),

			    UPT_SYSCALL_ARG4(&regs->regs));



	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))

		trace_sys_enter(regs, UPT_SYSCALL_NR(&regs->regs));



	if (!test_thread_flag(TIF_SYSCALL_TRACE))

		return 0;
@@ -142,6 +148,9 @@ void syscall_trace_leave(struct pt_regs *regs) 
	if (test_thread_flag(TIF_SINGLESTEP))

		send_sigtrap(&regs->regs, 0);



	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))

		trace_sys_exit(regs, PT_REGS_SYSCALL_RET(regs));



	if (!test_thread_flag(TIF_SYSCALL_TRACE))

		return;