127 lines
2.7 KiB
Diff
127 lines
2.7 KiB
Diff
From 3516f05627b33cb2e6e74965650c6d6c043f78f9 Mon Sep 17 00:00:00 2001
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From: Sumanth Korikkar <sumanthk@linux.ibm.com>
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Date: Mon, 6 Apr 2020 09:23:34 +0200
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Subject: [PATCH] bpftrace: Add s390x register support
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Add s390x specific registers. This is needed for bpftrace builtins like argX,
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regs(), retval etc. This commit provides various functions to perform proper
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offset calculation from the pt_regs context. The builtin functions of
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bpftrace uses these offset functions to generate the proper bytecode for s390x
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Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
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Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
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---
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src/arch/CMakeLists.txt | 3 ++
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src/arch/s390.cpp | 85 +++++++++++++++++++++++++++++++++++++++++
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2 files changed, 88 insertions(+)
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create mode 100644 src/arch/s390.cpp
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diff --git a/src/arch/CMakeLists.txt b/src/arch/CMakeLists.txt
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index 7156276..51707cb 100644
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--- a/src/arch/CMakeLists.txt
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+++ b/src/arch/CMakeLists.txt
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@@ -3,6 +3,9 @@ if(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
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elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "ppc64" OR
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CMAKE_SYSTEM_PROCESSOR STREQUAL "ppc64le")
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add_library(arch ppc64.cpp)
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+elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "s390" OR
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+ CMAKE_SYSTEM_PROCESSOR STREQUAL "s390x")
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+ add_library(arch s390.cpp)
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elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "x86_64")
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add_library(arch x86_64.cpp)
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else()
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diff --git a/src/arch/s390.cpp b/src/arch/s390.cpp
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new file mode 100644
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index 0000000..a2278c8
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--- /dev/null
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+++ b/src/arch/s390.cpp
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@@ -0,0 +1,85 @@
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+#include "arch.h"
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+
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+#include <algorithm>
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+#include <array>
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+
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+#define REQ_REGISTERS 19
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+#define ARG_REGISTERS 5
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+
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+namespace bpftrace {
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+namespace arch {
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+
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+// clang-format off
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+static std::array<std::string, REQ_REGISTERS> registers = {
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+ // Breakpoint event address
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+ "arg",
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+ "pswmask",
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+ // Instruction address
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+ "pswaddr",
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+ "r0",
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+ "r1",
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+ "r2",
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+ "r3",
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+ "r4",
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+ "r5",
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+ "r6",
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+ "r7",
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+ "r8",
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+ "r9",
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+ "r10",
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+ "r11",
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+ "r12",
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+ "r13",
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+ "r14",
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+ "r15",
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+};
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+
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+static std::array<std::string, ARG_REGISTERS> arg_registers = {
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+ "r2",
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+ "r3",
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+ "r4",
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+ "r5",
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+ "r6",
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+};
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+// clang-format on
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+
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+int offset(std::string reg_name)
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+{
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+ auto it = find(registers.begin(), registers.end(), reg_name);
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+ if (it == registers.end())
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+ return -1;
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+ return distance(registers.begin(), it);
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+}
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+
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+int max_arg()
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+{
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+ return arg_registers.size() - 1;
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+}
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+
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+int arg_offset(int arg_num)
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+{
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+ return offset(arg_registers.at(arg_num));
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+}
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+
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+int ret_offset()
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+{
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+ return offset("r2");
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+}
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+
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+int pc_offset()
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+{
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+ return offset("pswaddr");
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+}
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+
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+int sp_offset()
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+{
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+ return offset("r15");
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+}
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+
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+std::string name()
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+{
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+ return std::string("s390x");
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+}
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+
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+} // namespace arch
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+} // namespace bpftrace
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--
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2.25.3
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