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-rw-r--r--samples/bpf/Makefile13
-rw-r--r--samples/bpf/syscall_nrs.c12
-rw-r--r--samples/bpf/tracex5_kern.c11
3 files changed, 33 insertions, 3 deletions
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 6c7468e..a0561dc 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -160,6 +160,17 @@ clean:
$(MAKE) -C ../../ M=$(CURDIR) clean
@rm -f *~
+$(obj)/syscall_nrs.s: $(src)/syscall_nrs.c
+ $(call if_changed_dep,cc_s_c)
+
+$(obj)/syscall_nrs.h: $(obj)/syscall_nrs.s FORCE
+ $(call filechk,offsets,__SYSCALL_NRS_H__)
+
+clean-files += syscall_nrs.h
+
+FORCE:
+
+
# Verify LLVM compiler tools are available and bpf target is supported by llc
.PHONY: verify_cmds verify_target_bpf $(CLANG) $(LLC)
@@ -180,6 +191,8 @@ verify_target_bpf: verify_cmds
$(src)/*.c: verify_target_bpf
+$(obj)/tracex5_kern.o: $(obj)/syscall_nrs.h
+
# asm/sysreg.h - inline assembly used by it is incompatible with llvm.
# But, there is no easy way to fix it, so just exclude it since it is
# useless for BPF samples.
diff --git a/samples/bpf/syscall_nrs.c b/samples/bpf/syscall_nrs.c
new file mode 100644
index 0000000..ce2a30b
--- /dev/null
+++ b/samples/bpf/syscall_nrs.c
@@ -0,0 +1,12 @@
+#include <uapi/linux/unistd.h>
+#include <linux/kbuild.h>
+
+#define SYSNR(_NR) DEFINE(SYS ## _NR, _NR)
+
+void syscall_defines(void)
+{
+ COMMENT("Linux system call numbers.");
+ SYSNR(__NR_write);
+ SYSNR(__NR_read);
+ SYSNR(__NR_mmap);
+}
diff --git a/samples/bpf/tracex5_kern.c b/samples/bpf/tracex5_kern.c
index 7e4cf74..f57f4e1 100644
--- a/samples/bpf/tracex5_kern.c
+++ b/samples/bpf/tracex5_kern.c
@@ -9,6 +9,7 @@
#include <uapi/linux/bpf.h>
#include <uapi/linux/seccomp.h>
#include <uapi/linux/unistd.h>
+#include "syscall_nrs.h"
#include "bpf_helpers.h"
#define PROG(F) SEC("kprobe/"__stringify(F)) int bpf_func_##F
@@ -17,7 +18,11 @@ struct bpf_map_def SEC("maps") progs = {
.type = BPF_MAP_TYPE_PROG_ARRAY,
.key_size = sizeof(u32),
.value_size = sizeof(u32),
+#ifdef __mips__
+ .max_entries = 6000, /* MIPS n64 syscalls start at 5000 */
+#else
.max_entries = 1024,
+#endif
};
SEC("kprobe/__seccomp_filter")
@@ -37,7 +42,7 @@ int bpf_prog1(struct pt_regs *ctx)
}
/* we jump here when syscall number == __NR_write */
-PROG(__NR_write)(struct pt_regs *ctx)
+PROG(SYS__NR_write)(struct pt_regs *ctx)
{
struct seccomp_data sd;
@@ -50,7 +55,7 @@ PROG(__NR_write)(struct pt_regs *ctx)
return 0;
}
-PROG(__NR_read)(struct pt_regs *ctx)
+PROG(SYS__NR_read)(struct pt_regs *ctx)
{
struct seccomp_data sd;
@@ -63,7 +68,7 @@ PROG(__NR_read)(struct pt_regs *ctx)
return 0;
}
-PROG(__NR_mmap)(struct pt_regs *ctx)
+PROG(SYS__NR_mmap)(struct pt_regs *ctx)
{
char fmt[] = "mmap\n";
bpf_trace_printk(fmt, sizeof(fmt));
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