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ply: add dynamic tracing package using BPF

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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>
This commit is contained in:
Tony Ambardar 2024-05-06 17:06:55 -07:00 committed by Hauke Mehrtens
parent 2f4bb69664
commit 87d5d38e2a
2 changed files with 148 additions and 0 deletions
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54
package/devel/ply/Makefile Normal file
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@ -0,0 +1,54 @@
#
# Copyright (C) 2022 Ye Jiaqiang, Tony Ambardar
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(TOPDIR)/rules.mk
PKG_NAME:=ply
PKG_RELEASE:=1
PKG_SOURCE_PROTO:=git
PKG_SOURCE_URL:=https://github.com/iovisor/ply.git
PKG_MIRROR_HASH:=d4f434c4d11b662b61da2de8b5a29ecdeac655aa5158f4c4127e2a91047c0c54
PKG_SOURCE_DATE:=2023-05-16
PKG_SOURCE_VERSION:=1b57943db56692924bccb61c271de24a8264d8df
PKG_LICENSE:=GPLv2
PKG_LICENSE_FILES:=COPYING
PKG_MAINTAINER:=Tony Ambardar <itugrok@yahoo.com>
include $(INCLUDE_DIR)/package.mk
define Package/ply
SECTION:=devel
CATEGORY:=Development
TITLE:=Light-weight dynamic tracer for Linux
URL:=https://github.com/iovisor/ply.git
DEPENDS:= \
@KERNEL_BPF_EVENTS @KERNEL_DYNAMIC_FTRACE @KERNEL_DEBUG_FS \
@mips||mipsel||mips64||mips64el||x86_64||powerpc||arm_v7||aarch64||riscv||riscv64
endef
define Package/ply/description
A light-weight dynamic tracer for Linux that leverages the kernel's
BPF VM in concert with kprobes and tracepoints to attach probes to
arbitrary points in the kernel.
endef
CONFIGURE_ARGS += --enable-shared=yes --enable-static=no
define Build/Prepare
$(call Build/Prepare/Default)
cd $(PKG_BUILD_DIR) && exec ./autogen.sh
endef
define Package/ply/install
$(INSTALL_DIR) $(1)/usr/bin $(1)/usr/lib
$(INSTALL_BIN) $(PKG_BUILD_DIR)/src/ply/.libs/ply $(1)/usr/bin/
$(CP) $(PKG_BUILD_DIR)/src/libply/.libs/libply.so* $(1)/usr/lib/
endef
$(eval $(call BuildPackage,ply))

94
package/devel/ply/patches/100-revert-read-kernel-variants.patch Normal file
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@ -0,0 +1,94 @@
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;
}