xref: /linux/kernel/trace/Makefile (revision 5567fc9dcd7ed46678cd68e6ca0662331d42f0ac) 
1# SPDX-License-Identifier: GPL-2.0
2
3# Do not instrument the tracer itself:
4
5ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
6
7ifdef CONFIG_FUNCTION_TRACER
8
9# Avoid recursion due to instrumentation.
10KCSAN_SANITIZE := n
11
12ifdef CONFIG_FTRACE_SELFTEST
13# selftest needs instrumentation
14CFLAGS_trace_selftest_dynamic.o = $(CC_FLAGS_FTRACE)
15obj-y += trace_selftest_dynamic.o
16endif
17endif
18
19# Allow some files to be function traced
20ifdef CONFIG_FUNCTION_SELF_TRACING
21CFLAGS_trace_output.o = $(CC_FLAGS_FTRACE)
22CFLAGS_trace_seq.o = $(CC_FLAGS_FTRACE)
23CFLAGS_trace_stat.o = $(CC_FLAGS_FTRACE)
24CFLAGS_tracing_map.o = $(CC_FLAGS_FTRACE)
25CFLAGS_synth_event_gen_test.o = $(CC_FLAGS_FTRACE)
26CFLAGS_trace_events.o = $(CC_FLAGS_FTRACE)
27CFLAGS_trace_syscalls.o = $(CC_FLAGS_FTRACE)
28CFLAGS_trace_events_filter.o = $(CC_FLAGS_FTRACE)
29CFLAGS_trace_events_trigger.o = $(CC_FLAGS_FTRACE)
30CFLAGS_trace_events_synth.o = $(CC_FLAGS_FTRACE)
31CFLAGS_trace_events_hist.o = $(CC_FLAGS_FTRACE)
32CFLAGS_trace_events_user.o = $(CC_FLAGS_FTRACE)
33CFLAGS_trace_dynevent.o = $(CC_FLAGS_FTRACE)
34endif
35
36ifdef CONFIG_FTRACE_STARTUP_TEST
37CFLAGS_trace_kprobe_selftest.o = $(CC_FLAGS_FTRACE)
38obj-$(CONFIG_KPROBE_EVENTS) += trace_kprobe_selftest.o
39endif
40
41# If unlikely tracing is enabled, do not trace these files
42ifdef CONFIG_TRACING_BRANCHES
43KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
44endif
45
46# for GCOV coverage profiling
47ifdef CONFIG_GCOV_PROFILE_FTRACE
48GCOV_PROFILE := y
49endif
50
51# Functions in this file could be invoked from early interrupt
52# code and produce random code coverage.
53KCOV_INSTRUMENT_trace_preemptirq.o := n
54
55CFLAGS_bpf_trace.o := -I$(src)
56
57CFLAGS_trace_benchmark.o := -I$(src)
58CFLAGS_trace_events_filter.o := -I$(src)
59
60obj-$(CONFIG_TRACE_CLOCK) += trace_clock.o
61
62obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
63obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
64obj-$(CONFIG_RING_BUFFER_BENCHMARK) += ring_buffer_benchmark.o
65
66obj-$(CONFIG_TRACING) += trace.o
67obj-$(CONFIG_TRACING) += trace_output.o
68obj-$(CONFIG_TRACING) += trace_seq.o
69obj-$(CONFIG_TRACING) += trace_stat.o
70obj-$(CONFIG_TRACING) += trace_printk.o
71obj-$(CONFIG_TRACING) += trace_pid.o
72obj-$(CONFIG_TRACING) += 	pid_list.o
73obj-$(CONFIG_TRACING_MAP) += tracing_map.o
74obj-$(CONFIG_PREEMPTIRQ_DELAY_TEST) += preemptirq_delay_test.o
75obj-$(CONFIG_SYNTH_EVENT_GEN_TEST) += synth_event_gen_test.o
76obj-$(CONFIG_KPROBE_EVENT_GEN_TEST) += kprobe_event_gen_test.o
77obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
78obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
79obj-$(CONFIG_PREEMPTIRQ_TRACEPOINTS) += trace_preemptirq.o
80obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
81obj-$(CONFIG_PREEMPT_TRACER) += trace_irqsoff.o
82obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
83obj-$(CONFIG_HWLAT_TRACER) += trace_hwlat.o
84obj-$(CONFIG_OSNOISE_TRACER) += trace_osnoise.o
85obj-$(CONFIG_NOP_TRACER) += trace_nop.o
86obj-$(CONFIG_STACK_TRACER) += trace_stack.o
87obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
88obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
89obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
90obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
91obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += fgraph.o
92ifeq ($(CONFIG_BLOCK),y)
93obj-$(CONFIG_EVENT_TRACING) += blktrace.o
94endif
95obj-$(CONFIG_EVENT_TRACING) += trace_events.o
96obj-$(CONFIG_EVENT_TRACING) += trace_export.o
97obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
98ifeq ($(CONFIG_PERF_EVENTS),y)
99obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
100endif
101obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
102obj-$(CONFIG_EVENT_TRACING) += trace_events_trigger.o
103obj-$(CONFIG_EPROBE_EVENTS) += trace_eprobe.o
104obj-$(CONFIG_TRACE_EVENT_INJECT) += trace_events_inject.o
105obj-$(CONFIG_SYNTH_EVENTS) += trace_events_synth.o
106obj-$(CONFIG_HIST_TRIGGERS) += trace_events_hist.o
107obj-$(CONFIG_USER_EVENTS) += trace_events_user.o
108obj-$(CONFIG_BPF_EVENTS) += bpf_trace.o
109obj-$(CONFIG_KPROBE_EVENTS) += trace_kprobe.o
110obj-$(CONFIG_TRACEPOINTS) += error_report-traces.o
111obj-$(CONFIG_TRACEPOINTS) += power-traces.o
112ifeq ($(CONFIG_PM),y)
113obj-$(CONFIG_TRACEPOINTS) += rpm-traces.o
114endif
115ifeq ($(CONFIG_TRACING),y)
116obj-$(CONFIG_KGDB_KDB) += trace_kdb.o
117endif
118obj-$(CONFIG_DYNAMIC_EVENTS) += trace_dynevent.o
119obj-$(CONFIG_PROBE_EVENTS) += trace_probe.o
120obj-$(CONFIG_PROBE_EVENTS_BTF_ARGS) += trace_btf.o
121obj-$(CONFIG_UPROBE_EVENTS) += trace_uprobe.o
122obj-$(CONFIG_BOOTTIME_TRACING) += trace_boot.o
123obj-$(CONFIG_FTRACE_RECORD_RECURSION) += trace_recursion_record.o
124obj-$(CONFIG_FPROBE) += fprobe.o
125obj-$(CONFIG_RETHOOK) += rethook.o
126obj-$(CONFIG_FPROBE_EVENTS) += trace_fprobe.o
127
128obj-$(CONFIG_TRACEPOINT_BENCHMARK) += trace_benchmark.o
129obj-$(CONFIG_RV) += rv/
130
131obj-$(CONFIG_TRACE_REMOTE) += trace_remote.o
132obj-$(CONFIG_SIMPLE_RING_BUFFER) += simple_ring_buffer.o
133obj-$(CONFIG_TRACE_REMOTE_TEST) += remote_test.o
134
135#
136# simple_ring_buffer is used by the pKVM hypervisor which does not have access
137# to all kernel symbols. Fail the build if forbidden symbols are found.
138#
139# undefsyms_base generates a set of compiler and tooling-generated symbols that can
140# safely be ignored for simple_ring_buffer.
141#
142filechk_undefsyms_base = \
143	echo '$(pound)include <linux/atomic.h>'; \
144	echo '$(pound)include <linux/string.h>'; \
145	echo '$(pound)include <asm/page.h>'; \
146	echo 'static char page[PAGE_SIZE] __aligned(PAGE_SIZE);'; \
147	echo 'void undefsyms_base(void *p, int n);'; \
148	echo 'void undefsyms_base(void *p, int n) {'; \
149	echo '	char buffer[256] = { 0 };'; \
150	echo '	u32 u = 0;'; \
151	echo '	memset((char * volatile)page, 8, PAGE_SIZE);'; \
152	echo '	memset((char * volatile)buffer, 8, sizeof(buffer));'; \
153	echo '	memcpy((void * volatile)p, buffer, sizeof(buffer));'; \
154	echo '	cmpxchg((u32 * volatile)&u, 0, 8);'; \
155	echo '	WARN_ON(n == 0xdeadbeef);'; \
156	echo '}'
157
158$(obj)/undefsyms_base.c: FORCE
159	$(call filechk,undefsyms_base)
160
161clean-files += undefsyms_base.c
162
163$(obj)/undefsyms_base.o: $(obj)/undefsyms_base.c
164
165targets += undefsyms_base.o
166
167# Ensure KASAN is enabled to avoid logic that may disable FORTIFY_SOURCE when
168# KASAN is not enabled. undefsyms_base.o does not automatically get KASAN flags
169# because it is not linked into vmlinux.
170KASAN_SANITIZE_undefsyms_base.o := y
171
172UNDEFINED_ALLOWLIST = __asan __gcov __kasan __kcsan __hwasan __sancov __sanitizer __tsan __ubsan __x86_indirect_thunk \
173		      __msan simple_ring_buffer \
174		      $(shell $(NM) -u $(obj)/undefsyms_base.o 2>/dev/null | awk '{print $$2}')
175
176quiet_cmd_check_undefined = NM      $<
177      cmd_check_undefined = \
178          undefsyms=$$($(NM) -u $< | grep -v $(addprefix -e , $(UNDEFINED_ALLOWLIST)) || true); \
179          if [ -n "$$undefsyms" ]; then \
180              echo "Unexpected symbols in $<:" >&2; \
181              echo "$$undefsyms" >&2; \
182              false; \
183          fi
184
185$(obj)/%.o.checked: $(obj)/%.o $(obj)/undefsyms_base.o FORCE
186	$(call if_changed,check_undefined)
187
188always-$(CONFIG_SIMPLE_RING_BUFFER) += simple_ring_buffer.o.checked
189
190libftrace-y := ftrace.o
191