michalgr / bpftrace_local_manifest Goto Github PK
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Local manifest instructing repo to pick bpftrace-related projects from https://github.com/michalgr/
Hello michalgr,
I built Android R (kernel version 4.19) image for my device included your manifest of bpftrace functionality.
I got the error when list available uprobes:
bpftrace -l uprobe:/apex/com.android.runtime/lib64/bionic/libc.so:*
sh: objdump: inaccessible or not found
bpftrace -e 'uprobe:/apex/com.android.runtime/lib64/bionic/libc.so:*pthread* { printf("read a line\n"); }'
LLVM ERROR: out of memory
Do you have any suggestion? very thanks!
hello. I built bpftrace using build_scripts_for_android
But I found that the str()
method could not be used。for example
#!/data/local/tmp/bpftools-arm64-0.0.1/bpftrace
#include <linux/mm.h>
#include <linux/fs.h>
kprobe:handle_mm_fault
{
$vma = (struct vm_area_struct *)arg0;
$file = $vma->vm_file->f_path.dentry->d_name.name;
@[str($file)] = count();
}
This error occurred while running
255|blueline:/data/local/tmp/bpftools-arm64-0.0.1 # ./pagefault.bt -v
Attaching 1 probe...
Error log:
0: (79) r3 = *(u64 *)(r1 +112)
1: (07) r3 += 160
2: (bf) r1 = r10
3: (07) r1 += -72
4: (b7) r2 = 8
5: (85) call 4
6: (79) r3 = *(u64 *)(r10 -72)
7: (07) r3 += 24
8: (bf) r1 = r10
9: (07) r1 += -72
10: (b7) r2 = 8
11: (85) call 4
12: (79) r3 = *(u64 *)(r10 -72)
13: (07) r3 += 40
14: (bf) r1 = r10
15: (07) r1 += -72
16: (b7) r2 = 8
17: (85) call 4
18: (79) r3 = *(u64 *)(r10 -72)
19: (b7) r1 = 0
20: (7b) *(u64 *)(r10 -16) = r1
21: (7b) *(u64 *)(r10 -24) = r1
22: (7b) *(u64 *)(r10 -32) = r1
23: (7b) *(u64 *)(r10 -40) = r1
24: (7b) *(u64 *)(r10 -48) = r1
25: (7b) *(u64 *)(r10 -56) = r1
26: (7b) *(u64 *)(r10 -64) = r1
27: (7b) *(u64 *)(r10 -72) = r1
28: (bf) r6 = r10
29: (07) r6 += -72
30: (bf) r1 = r6
31: (b7) r2 = 64
32: (85) call 45
unknown func 45
Error loading program: kprobe:handle_mm_fault
#include <linux/mm.h>
#include <linux/fs.h>
Program
kprobe:handle_mm_fault
=
variable: $vma
(struct vm_area_struct*)
builtin: arg0
=
variable: $file
.
.
dereference
.
.
dereference
.
dereference
variable: $vma
vm_file
f_path
dentry
d_name
name
call: printf
string: %s
call: str
variable: $file
; ModuleID = 'bpftrace'
source_filename = "bpftrace"
target datalayout = "e-m:e-p:64:64-i64:64-n32:64-S128"
target triple = "bpf-pc-linux"
%printf_t = type { i64, [64 x i8] }
; Function Attrs: nounwind
declare i64 @llvm.bpf.pseudo(i64, i64) #0
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
define i64 @"kprobe:handle_mm_fault"(i8*) local_unnamed_addr section "s_kprobe:handle_mm_fault_1" {
entry:
%str = alloca [64 x i8], align 1
%printf_args = alloca %printf_t, align 8
%"struct qstr.name" = alloca i64, align 8
%"struct path.dentry" = alloca i64, align 8
%"struct vm_area_struct.vm_file" = alloca i64, align 8
%1 = getelementptr i8, i8* %0, i64 112
%arg0 = load i64, i8* %1, align 8
%2 = add i64 %arg0, 160
%3 = bitcast i64* %"struct vm_area_struct.vm_file" to i8*
call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %3)
%probe_read = call i64 inttoptr (i64 4 to i64 (i8*, i64, i8*)*)(i64* nonnull %"struct vm_area_struct.vm_file", i64 8, i64 %2)
%4 = load i64, i64* %"struct vm_area_struct.vm_file", align 8
call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %3)
%5 = add i64 %4, 24
%6 = bitcast i64* %"struct path.dentry" to i8*
call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %6)
%probe_read1 = call i64 inttoptr (i64 4 to i64 (i8*, i64, i8*)*)(i64* nonnull %"struct path.dentry", i64 8, i64 %5)
%7 = load i64, i64* %"struct path.dentry", align 8
call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %6)
%8 = add i64 %7, 40
%9 = bitcast i64* %"struct qstr.name" to i8*
call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %9)
%probe_read2 = call i64 inttoptr (i64 4 to i64 (i8*, i64, i8*)*)(i64* nonnull %"struct qstr.name", i64 8, i64 %8)
%10 = load i64, i64* %"struct qstr.name", align 8
call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %9)
%11 = bitcast %printf_t* %printf_args to i8*
call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %11)
%12 = getelementptr inbounds [64 x i8], [64 x i8]* %str, i64 0, i64 0
%13 = bitcast %printf_t* %printf_args to i8*
call void @llvm.memset.p0i8.i64(i8* nonnull align 8 %13, i8 0, i64 72, i1 false)
call void @llvm.lifetime.start.p0i8(i64 -1, i8* nonnull %12)
call void @llvm.memset.p0i8.i64(i8* nonnull align 1 %12, i8 0, i64 64, i1 false)
%probe_read_str = call i64 inttoptr (i64 45 to i64 (i8*, i64, i8*)*)([64 x i8]* nonnull %str, i64 64, i64 %10)
%14 = getelementptr inbounds %printf_t, %printf_t* %printf_args, i64 0, i32 1, i64 0
call void @llvm.memcpy.p0i8.p0i8.i64(i8* nonnull align 8 %14, i8* nonnull align 1 %12, i64 64, i1 false)
call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %12)
call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %12)
%pseudo = call i64 @llvm.bpf.pseudo(i64 1, i64 1)
%get_cpu_id = call i64 inttoptr (i64 8 to i64 ()*)()
%perf_event_output = call i64 inttoptr (i64 25 to i64 (i8*, i64, i64, %printf_t*, i64)*)(i8* %0, i64 %pseudo, i64 %get_cpu_id, %printf_t* nonnull %printf_args, i64 72)
call void @llvm.lifetime.end.p0i8(i64 -1, i8* nonnull %11)
ret i64 0
}
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
; Function Attrs: argmemonly nounwind
declare void @llvm.memset.p0i8.i64(i8* nocapture writeonly, i8, i64, i1) #1
; Function Attrs: argmemonly nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1) #1
attributes #0 = { nounwind }
attributes #1 = { argmemonly nounwind }
Linux version 4.9.200-dirty_audio (liyan@ci14) (Android (5484270 based on r353983c) clang version 9.0.3 (https://android.googlesource.com/toolchain/clang 745b335211bb9eadfa6aa6301f84715cee4b37c5) (https://android.googlesource.com/toolchain/llvm 60cf23e54e46c807513f7a36d0a7b777920b5881) (based on LLVM 9.0.3svn)) #0 SMP PREEMPT Mon May 11 16:01:49 CST 2020
Android 10
Pixel 3
Android/aosp_blueline/blueline:10/QQ2A.200405.005/6254899:userdebug/test-keys
Thank you
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