mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 16:31:13 +00:00
87d5d38e2a
ply is a light-weight dynamic tracer for Linux that leverages the kernel's BPF VM in concert with kprobes/tracepoints to attach probes to arbitrary points in the kernel. Most tracers that generate BPF bytecode are based on the LLVM-based BCC toolchain; ply on the other hand has no external dependencies outside libc, making it suitable for use on constrained embedded systems. Currently ply supports x86_64, aarch64, arm, riscv64, riscv32, powerpc, mips(el), and mips64(el) architectures. Further documentation, examples and implementation details may be found at: https://github.com/iovisor/ply. Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
95 lines
3.2 KiB
Diff
95 lines
3.2 KiB
Diff
From 755220eb974708615b14bcdc6412319698e0485d Mon Sep 17 00:00:00 2001
|
|
From: Tony Ambardar <Tony.Ambardar@gmail.com>
|
|
Date: Thu, 22 Dec 2022 22:53:10 -0800
|
|
Subject: [PATCH] Revert "ply: Use new read_kernel variants"
|
|
|
|
This reverts commit 17864b9818cceca09f31a346908afe1c718c10c5.
|
|
|
|
Fixes: 17864b98 ("ply: Use new read_kernel variants")
|
|
Signed-off-by: Tony Ambardar <Tony.Ambardar@gmail.com>
|
|
---
|
|
src/libply/built-in/memory.c | 10 +++++-----
|
|
src/libply/ir.c | 10 +++++-----
|
|
src/libply/provider/tracepoint.c | 2 +-
|
|
3 files changed, 11 insertions(+), 11 deletions(-)
|
|
|
|
--- a/src/libply/built-in/memory.c
|
|
+++ b/src/libply/built-in/memory.c
|
|
@@ -140,7 +140,7 @@ static int str_ir_post(const struct func
|
|
ir_emit_ldbp(pb->ir, BPF_REG_1, n->sym->irs.stack);
|
|
ir_emit_insn(ir, MOV_IMM((int32_t)type_sizeof(n->sym->type)), BPF_REG_2, 0);
|
|
ir_emit_sym_to_reg(ir, BPF_REG_3, ptr->sym);
|
|
- ir_emit_insn(ir, CALL(BPF_FUNC_probe_read_kernel_str), 0, 0);
|
|
+ ir_emit_insn(ir, CALL(BPF_FUNC_probe_read_str), 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
@@ -305,7 +305,7 @@ static int struct_dot_ir_pre(const struc
|
|
sou->sym->irs.hint.dot = 1;
|
|
|
|
/* this also means we need to put ourselves on the
|
|
- * stack since data will be loaded via probe_read_kernel */
|
|
+ * stack since data will be loaded via probe_read */
|
|
n->sym->irs.hint.stack = 1;
|
|
}
|
|
return 0;
|
|
@@ -334,7 +334,7 @@ static int struct_dot_ir_post(const stru
|
|
|
|
ir_emit_sym_to_reg(pb->ir, BPF_REG_3, ptr->sym);
|
|
ir_emit_insn(pb->ir, ALU64_IMM(BPF_ADD, offset), BPF_REG_3, 0);
|
|
- goto probe_read_kernel;
|
|
+ goto probe_read;
|
|
}
|
|
|
|
offset += sou->sym->irs.stack;
|
|
@@ -346,10 +346,10 @@ static int struct_dot_ir_post(const stru
|
|
}
|
|
|
|
ir_emit_insn(pb->ir, ALU_IMM(BPF_ADD, offset), BPF_REG_3, 0);
|
|
-probe_read_kernel:
|
|
+probe_read:
|
|
ir_emit_insn(pb->ir, MOV_IMM((int32_t)dst->size), BPF_REG_2, 0);
|
|
ir_emit_ldbp(pb->ir, BPF_REG_1, dst->stack);
|
|
- ir_emit_insn(pb->ir, CALL(BPF_FUNC_probe_read_kernel), 0, 0);
|
|
+ ir_emit_insn(pb->ir, CALL(BPF_FUNC_probe_read), 0, 0);
|
|
/* TODO if (r0) exit(r0); */
|
|
return 0;
|
|
}
|
|
--- a/src/libply/ir.c
|
|
+++ b/src/libply/ir.c
|
|
@@ -38,10 +38,10 @@ static const char *bpf_func_name(enum bp
|
|
return "map_update_elem";
|
|
case BPF_FUNC_perf_event_output:
|
|
return "perf_event_output";
|
|
- case BPF_FUNC_probe_read_kernel:
|
|
- return "probe_read_kernel";
|
|
- case BPF_FUNC_probe_read_kernel_str:
|
|
- return "probe_read_kernel_str";
|
|
+ case BPF_FUNC_probe_read:
|
|
+ return "probe_read";
|
|
+ case BPF_FUNC_probe_read_str:
|
|
+ return "probe_read_str";
|
|
case BPF_FUNC_trace_printk:
|
|
return "trace_printk";
|
|
default:
|
|
@@ -416,7 +416,7 @@ void ir_emit_read_to_sym(struct ir *ir,
|
|
if (src != BPF_REG_3)
|
|
ir_emit_insn(ir, MOV, BPF_REG_3, src);
|
|
|
|
- ir_emit_insn(ir, CALL(BPF_FUNC_probe_read_kernel), 0, 0);
|
|
+ ir_emit_insn(ir, CALL(BPF_FUNC_probe_read), 0, 0);
|
|
/* TODO if (r0) exit(r0); */
|
|
}
|
|
|
|
--- a/src/libply/provider/tracepoint.c
|
|
+++ b/src/libply/provider/tracepoint.c
|
|
@@ -68,7 +68,7 @@ static int tracepoint_dyn_ir_post(const
|
|
ir_emit_insn(ir, ALU_IMM(BPF_AND, 0xffff), BPF_REG_4, 0);
|
|
ir_emit_insn(ir, ALU64(BPF_ADD), BPF_REG_3, BPF_REG_4);
|
|
|
|
- ir_emit_insn(ir, CALL(BPF_FUNC_probe_read_kernel), 0, 0);
|
|
+ ir_emit_insn(ir, CALL(BPF_FUNC_probe_read), 0, 0);
|
|
return 0;
|
|
}
|
|
|