add support for perf events

3 files changed, 51 insertions, 3 deletions

diff --git a/sys/decl.go b/sys/decl.go
index fd8f6089b..1cb866f62 100644
--- a/sys/decl.go
+++ b/sys/decl.go
@@ -75,6 +75,7 @@ const (
 	FdKdbus
 	FdBpfMap
 	FdBpfProg
+	FdPerf
 
 	IPCMsq
 	IPCSem
@@ -172,8 +173,9 @@ func (t ResourceType) Size() uintptr {
 func (t ResourceType) SubKinds() []ResourceSubkind {
 	switch t.Kind {
 	case ResFD:
-		return []ResourceSubkind{FdFile, FdSock, FdPipe, FdSignal, FdEvent, FdTimer, FdEpoll,
-			FdDir, FdMq, FdInotify, FdFanotify, FdTty, FdDRI, FdFuse, FdKdbus, FdBpfMap, FdBpfProg}
+		return []ResourceSubkind{FdFile, FdSock, FdPipe, FdSignal, FdEvent,
+			FdTimer, FdEpoll, FdDir, FdMq, FdInotify, FdFanotify, FdTty,
+			FdDRI, FdFuse, FdKdbus, FdBpfMap, FdBpfProg, FdPerf}
 	case ResIPC:
 		return []ResourceSubkind{IPCMsq, IPCSem, IPCShm}
 	case ResIOCtx, ResKey, ResInotifyDesc, ResPid, ResUid, ResGid, ResTimerid:
diff --git a/sys/sys.go b/sys/sys.go
index e902f61bf..e1163bb19 100644
--- a/sys/sys.go
+++ b/sys/sys.go
@@ -531,4 +531,5 @@ var Calls = []*Call{
 	&Call{ID: 526, Name: "bpf$OBJ_PIN_PROG", CallName: "bpf", Args: []Type{ConstType{TypeCommon: TypeCommon{TypeName: "cmd", IsOptional: false}, TypeSize: 0, Val: uintptr(6)}, PtrType{TypeCommon: TypeCommon{TypeName: "arg", IsOptional: false}, Type: StructType{TypeCommon: TypeCommon{TypeName: "bpf_obj_pin_prog", IsOptional: false}, Fields: []Type{PtrType{TypeCommon: TypeCommon{TypeName: "path", IsOptional: false}, Dir: DirIn, Type: FilenameType{TypeCommon: TypeCommon{TypeName: "path", IsOptional: false}}}, ResourceType{TypeCommon: TypeCommon{TypeName: "fd", IsOptional: false}, Kind: ResFD, Subkind: FdBpfProg}}}, Dir: DirIn}, LenType{TypeCommon: TypeCommon{TypeName: "size", IsOptional: false}, Buf: "arg", TypeSize: 0}}},
 	&Call{ID: 527, Name: "bpf$OBJ_GET_MAP", CallName: "bpf", Ret: ResourceType{TypeCommon: TypeCommon{TypeName: "ret", IsOptional: false}, Kind: ResFD, Subkind: FdBpfMap}, Args: []Type{ConstType{TypeCommon: TypeCommon{TypeName: "cmd", IsOptional: false}, TypeSize: 0, Val: uintptr(7)}, PtrType{TypeCommon: TypeCommon{TypeName: "arg", IsOptional: false}, Type: StructType{TypeCommon: TypeCommon{TypeName: "bpf_obj_get", IsOptional: false}, Fields: []Type{PtrType{TypeCommon: TypeCommon{TypeName: "path", IsOptional: false}, Dir: DirIn, Type: FilenameType{TypeCommon: TypeCommon{TypeName: "path", IsOptional: false}}}, ConstType{TypeCommon: TypeCommon{TypeName: "fd", IsOptional: false}, TypeSize: 4, Val: uintptr(0)}}}, Dir: DirIn}, LenType{TypeCommon: TypeCommon{TypeName: "size", IsOptional: false}, Buf: "arg", TypeSize: 0}}},
 	&Call{ID: 528, Name: "bpf$OBJ_GET_PROG", CallName: "bpf", Ret: ResourceType{TypeCommon: TypeCommon{TypeName: "ret", IsOptional: false}, Kind: ResFD, Subkind: FdBpfProg}, Args: []Type{ConstType{TypeCommon: TypeCommon{TypeName: "cmd", IsOptional: false}, TypeSize: 0, Val: uintptr(7)}, PtrType{TypeCommon: TypeCommon{TypeName: "arg", IsOptional: false}, Type: StructType{TypeCommon: TypeCommon{TypeName: "bpf_obj_get", IsOptional: false}, Fields: []Type{PtrType{TypeCommon: TypeCommon{TypeName: "path", IsOptional: false}, Dir: DirIn, Type: FilenameType{TypeCommon: TypeCommon{TypeName: "path", IsOptional: false}}}, ConstType{TypeCommon: TypeCommon{TypeName: "fd", IsOptional: false}, TypeSize: 4, Val: uintptr(0)}}}, Dir: DirIn}, LenType{TypeCommon: TypeCommon{TypeName: "size", IsOptional: false}, Buf: "arg", TypeSize: 0}}},
+	&Call{ID: 529, Name: "perf_event_open", CallName: "perf_event_open", Ret: ResourceType{TypeCommon: TypeCommon{TypeName: "ret", IsOptional: false}, Kind: ResFD, Subkind: FdPerf}, Args: []Type{PtrType{TypeCommon: TypeCommon{TypeName: "attr", IsOptional: false}, Type: StructType{TypeCommon: TypeCommon{TypeName: "perf_event_attr", IsOptional: false}, Fields: []Type{FlagsType{TypeCommon: TypeCommon{TypeName: "type", IsOptional: false}, TypeSize: 4, Vals: []uintptr{0, 1, 2, 3, 4, 5}}, LenType{TypeCommon: TypeCommon{TypeName: "size", IsOptional: false}, Buf: "parent", TypeSize: 4}, IntType{TypeCommon: TypeCommon{TypeName: "config", IsOptional: false}, TypeSize: 8}, IntType{TypeCommon: TypeCommon{TypeName: "freq", IsOptional: false}, TypeSize: 8}, IntType{TypeCommon: TypeCommon{TypeName: "sample", IsOptional: false}, TypeSize: 8}, IntType{TypeCommon: TypeCommon{TypeName: "format", IsOptional: false}, TypeSize: 8}, IntType{TypeCommon: TypeCommon{TypeName: "flags0", IsOptional: false}, TypeSize: 1}, IntType{TypeCommon: TypeCommon{TypeName: "flags1", IsOptional: false}, TypeSize: 1}, IntType{TypeCommon: TypeCommon{TypeName: "flags2", IsOptional: false}, TypeSize: 1}, IntType{TypeCommon: TypeCommon{TypeName: "flags3", IsOptional: false}, TypeSize: 1}, IntType{TypeCommon: TypeCommon{TypeName: "flags4", IsOptional: false}, TypeSize: 1}, IntType{TypeCommon: TypeCommon{TypeName: "flags5", IsOptional: false}, TypeSize: 1}, IntType{TypeCommon: TypeCommon{TypeName: "flags6", IsOptional: false}, TypeSize: 1}, IntType{TypeCommon: TypeCommon{TypeName: "flags7", IsOptional: false}, TypeSize: 1}, IntType{TypeCommon: TypeCommon{TypeName: "wakeup", IsOptional: false}, TypeSize: 4}, FlagsType{TypeCommon: TypeCommon{TypeName: "bptype", IsOptional: false}, TypeSize: 4, Vals: []uintptr{0, 1, 2, 4}}, IntType{TypeCommon: TypeCommon{TypeName: "config1", IsOptional: false}, TypeSize: 8}, IntType{TypeCommon: TypeCommon{TypeName: "config2", IsOptional: false}, TypeSize: 8}, IntType{TypeCommon: TypeCommon{TypeName: "bsample", IsOptional: false}, TypeSize: 8}, IntType{TypeCommon: TypeCommon{TypeName: "regs", IsOptional: false}, TypeSize: 8}, IntType{TypeCommon: TypeCommon{TypeName: "stack", IsOptional: false}, TypeSize: 8}, FlagsType{TypeCommon: TypeCommon{TypeName: "clockid", IsOptional: false}, TypeSize: 4, Vals: []uintptr{0, 5, 1, 6, 4, 7, 2, 3}}, ConstType{TypeCommon: TypeCommon{TypeName: "pad", IsOptional: false}, TypeSize: 4, Val: uintptr(0)}, IntType{TypeCommon: TypeCommon{TypeName: "regs2", IsOptional: false}, TypeSize: 8}, IntType{TypeCommon: TypeCommon{TypeName: "auxwm", IsOptional: false}, TypeSize: 4}, ConstType{TypeCommon: TypeCommon{TypeName: "pad", IsOptional: false}, TypeSize: 4, Val: uintptr(0)}}}, Dir: DirIn}, ResourceType{TypeCommon: TypeCommon{TypeName: "pid", IsOptional: false}, Kind: ResPid}, IntType{TypeCommon: TypeCommon{TypeName: "cpu", IsOptional: false}, TypeSize: 8}, ResourceType{TypeCommon: TypeCommon{TypeName: "group", IsOptional: false}, Kind: ResFD, Subkind: FdPerf}, FlagsType{TypeCommon: TypeCommon{TypeName: "flags", IsOptional: false}, TypeSize: 0, Vals: []uintptr{1, 2, 4, 8}}}},
 }
diff --git a/sys/sys.txt b/sys/sys.txt
index d7e8168b5..4f28c9efe 100644
--- a/sys/sys.txt
+++ b/sys/sys.txt
@@ -69,6 +69,8 @@ include <linux/fiemap.h>
 include <linux/kd.h>
 include <linux/vt.h>
 include <linux/fuse.h>
+include <linux/perf_event.h>
+include <linux/hw_breakpoint.h>
 
 include <asm/prctl.h>
 
@@ -1405,7 +1407,6 @@ define F_SEAL_WRITE		0x0008
 #define __NR_swapoff 168
 #define __NR_quotactl 179
 #define __NR_nfsservctl 180
-#define __NR_perf_event_open 298
 #define __NR_getcpu 309
 #define __NR_process_vm_readv 310
 #define __NR_process_vm_writev 311
@@ -2442,3 +2443,47 @@ define BPF_PROG_TYPE_SCHED_CLS		3
 define BPF_PROG_TYPE_SCHED_ACT		4
 
 define SO_ATTACH_BPF			50
+
+
+
+
+# Perf
+
+perf_event_open(attr ptr[in, perf_event_attr], pid pid, cpu intptr, group fd[perf], flags flags[perf_flags]) fd[perf]
+
+perf_flags = PERF_FLAG_FD_NO_GROUP, PERF_FLAG_FD_OUTPUT, PERF_FLAG_PID_CGROUP, PERF_FLAG_FD_CLOEXEC
+perf_event_type = PERF_TYPE_HARDWARE, PERF_TYPE_SOFTWARE, PERF_TYPE_TRACEPOINT, PERF_TYPE_HW_CACHE, PERF_TYPE_RAW, PERF_TYPE_BREAKPOINT
+perf_bp_type = HW_BREAKPOINT_EMPTY, HW_BREAKPOINT_R, HW_BREAKPOINT_W, HW_BREAKPOINT_X
+
+perf_event_attr {
+	type	flags[perf_event_type, int32]
+	size	len[parent, int32]
+	config	int64
+	freq	int64
+	sample	int64
+	format	int64
+# Lots of various bit flags.
+# Split into int8's because for int64 large values generated less frequently than small ones.
+	flags0	int8
+	flags1	int8
+	flags2	int8
+	flags3	int8
+	flags4	int8
+	flags5	int8
+	flags6	int8
+	flags7	int8
+	wakeup	int32
+	bptype	flags[perf_bp_type, int32]
+	config1	int64
+	config2	int64
+	bsample	int64
+	regs	int64
+	stack	int64
+	clockid	flags[clock_type, int32]
+	pad	const[0, int32]
+	regs2	int64
+	auxwm	int32
+	pad	const[0, int32]
+}
+
+define PERF_FLAG_FD_CLOEXEC		(1UL << 3)