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buildrun.cxx
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// build/run probes
// Copyright (C) 2005-2016 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
#include "config.h"
#include "buildrun.h"
#include "session.h"
#include "util.h"
#include "hash.h"
#include "translate.h"
#include <cstdlib>
#include <fstream>
#include <sstream>
#include <thread>
extern "C" {
#include <signal.h>
#include <sys/wait.h>
#include <pwd.h>
#include <grp.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/resource.h>
}
// A bit of obfuscation for Gentoo's sake.
// We *need* -Werror for stapconf to work correctly.
// https://bugs.gentoo.org/show_bug.cgi?id=522908
#define WERROR ("-W" "error")
using namespace std;
/* Adjust and run make_cmd to build a kernel module. */
static int
run_make_cmd(systemtap_session& s, vector<string>& make_cmd,
bool null_out=false, bool null_err=false)
{
assert_no_interrupts();
// PR14168: we used to unsetenv values here; instead do it via
// env(1) in make_any_make_cmd().
// Disable ccache to avoid saving files that will never be reused.
// (ccache is useless to us, because our compiler commands always
// include the randomized tmpdir path.)
// It's not critical if this fails, so the return is ignored.
(void) setenv("CCACHE_DISABLE", "1", 0);
if (s.verbose > 2)
make_cmd.push_back("V=1");
else if (s.verbose > 1)
make_cmd.push_back("--no-print-directory");
else
{
make_cmd.push_back("-s");
make_cmd.push_back("--no-print-directory");
}
// Exploit SMP parallelism, if available.
long smp = thread::hardware_concurrency();
if (smp <= 0) smp = 1;
// PR16276: but only if we're not running severely nproc-rlimited
struct rlimit rlim;
int rlimit_rc = getrlimit(RLIMIT_NPROC, &rlim);
const unsigned int severely_limited = smp*30; // WAG at number of gcc+make etc. nested processes
bool nproc_limited = (rlimit_rc == 0 && (rlim.rlim_max <= severely_limited ||
rlim.rlim_cur <= severely_limited));
if (smp >= 1 && !nproc_limited)
make_cmd.push_back("-j" + lex_cast(smp+1));
if (strverscmp (s.kernel_base_release.c_str(), "2.6.29") < 0)
{
// Older kernels, before linux commit #fd54f502841c1, include
// gratuitous "echo"s in their Makefile. We need to suppress
// that with this bluntness.
null_out = true;
}
int rc = stap_system (s.verbose, "kbuild", make_cmd, null_out, null_err);
if (rc != 0)
s.set_try_server ();
return rc;
}
static vector<string>
make_any_make_cmd(systemtap_session& s, const string& dir, const string& target)
{
string newpath("PATH=/usr/bin:/bin");
const char *oldpath = getenv("PATH");
if (oldpath != NULL)
{
newpath += ':';
newpath += oldpath;
}
vector<string> make_cmd
{
// PR14168: sanitize environment variables for kbuild invocation
"env", "-uARCH", "-uKBUILD_EXTMOD", "-uCROSS_COMPILE", "-uKBUILD_IMAGE",
"-uKCONFIG_CONFIG", "-uINSTALL_PATH", "-uLD_LIBRARY_PATH", newpath,
"make", "-C", s.kernel_build_tree,
"M=" + dir, // need make-quoting?
target,
// PR13847: suppress debuginfo creation by default
"CONFIG_DEBUG_INFO=",
// RHBZ1321628: suppress stack validation; expected to be temporary
"CONFIG_STACK_VALIDATION=",
};
// Add architecture, except for old powerpc (RHBZ669082)
if (s.architecture != "powerpc" ||
(strverscmp (s.kernel_base_release.c_str(), "2.6.15") >= 0))
make_cmd.push_back("ARCH=" + s.architecture); // need make-quoting?
// Add any custom kbuild flags
make_cmd.insert(make_cmd.end(), s.kbuildflags.begin(), s.kbuildflags.end());
return make_cmd;
}
static vector<string>
make_make_cmd(systemtap_session& s, const string& dir)
{
vector<string> mc = make_any_make_cmd(s, dir, "modules");
if (s.keep_tmpdir)
{
string E_source = s.translated_source.substr(s.translated_source.find_last_of("/")+1);
E_source.at(E_source.length() - 1) = 'i'; // overwrite the last character
mc.push_back(E_source);
}
return mc;
}
static vector<string>
make_make_objs_cmd(systemtap_session& s, const string& dir)
{
// Kbuild uses these rules to build external modules:
//
// module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
// modules: $(module-dirs)
// @$(kecho) ' Building modules, stage 2.';
// $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
//
// So if we're only interested in the stage 1 objects, we can
// cheat and make only the $(module-dirs) part.
return make_any_make_cmd(s, dir, "_module_" + dir);
}
static void
output_autoconf(systemtap_session& s, ofstream& o, const char *autoconf_c,
const char *deftrue, const char *deffalse)
{
o << "\t";
if (s.verbose < 4)
o << "@";
o << "if $(CHECK_BUILD) $(SYSTEMTAP_RUNTIME)/linux/" << autoconf_c;
if (s.verbose < 5)
o << " > /dev/null 2>&1";
o << "; then ";
if (deftrue)
o << "echo \"#define " << deftrue << " 1\"";
if (deffalse)
o << "; else echo \"#define " << deffalse << " 1\"";
o << "; fi >> $@" << endl;
}
void output_exportconf(systemtap_session& s, ofstream& o, const char *symbol,
const char *deftrue)
{
o << "\t";
if (s.verbose < 4)
o << "@";
if (s.kernel_exports.find(symbol) != s.kernel_exports.end())
o << "echo \"#define " << deftrue << " 1\"";
o << ">> $@" << endl;
}
void output_dual_exportconf(systemtap_session& s, ofstream& o,
const char *symbol1, const char *symbol2,
const char *deftrue)
{
o << "\t";
if (s.verbose < 4)
o << "@";
if (s.kernel_exports.find(symbol1) != s.kernel_exports.end()
&& s.kernel_exports.find(symbol2) != s.kernel_exports.end())
o << "echo \"#define " << deftrue << " 1\"";
o << ">> $@" << endl;
}
void output_either_exportconf(systemtap_session& s, ofstream& o,
const char *symbol1, const char *symbol2,
const char *deftrue)
{
o << "\t";
if (s.verbose < 4)
o << "@";
if (s.kernel_exports.find(symbol1) != s.kernel_exports.end()
|| s.kernel_exports.find(symbol2) != s.kernel_exports.end())
o << "echo \"#define " << deftrue << " 1\"";
o << ">> $@" << endl;
}
static int
compile_dyninst (systemtap_session& s)
{
const string module = s.tmpdir + "/" + s.module_filename();
vector<string> cmd
{
"gcc", "--std=gnu99", s.translated_source, "-o", module,
"-fvisibility=hidden", "-O2", "-I" + s.runtime_path, "-D__DYNINST__",
"-Wall", WERROR, "-Wno-unused", "-Wno-strict-aliasing",
"-pthread", "-lrt", "-fPIC", "-shared",
};
// BZ855981/948279. Since dyninst/runtime.h includes __sync_* calls,
// the compiler may generate different code for it depending on -march.
// For example, if the default is i386, we may get references to auxiliary
// functions like __sync_add_and_fetch_4, which appear to be defined
// nowhere. We hack around this problem thusly:
if (s.architecture == "i386")
cmd.push_back("-march=i586");
for (size_t i = 0; i < s.c_macros.size(); ++i)
cmd.push_back("-D" + s.c_macros[i]);
if (s.verbose > 3)
cmd.insert(cmd.end(), { "-ftime-report", "-Q" });
// Add any custom kbuild flags
cmd.insert(cmd.end(), s.kbuildflags.begin(), s.kbuildflags.end());
int rc = stap_system (s.verbose, cmd);
if (rc)
s.set_try_server ();
return rc;
}
int
compile_pass (systemtap_session& s)
{
if (s.runtime_usermode_p())
return compile_dyninst (s);
int rc = uprobes_pass (s);
if (rc)
{
s.set_try_server ();
return rc;
}
// fill in a quick Makefile
string makefile_nm = s.tmpdir + "/Makefile";
ofstream o (makefile_nm.c_str());
// Create makefile
// Clever hacks copied from vmware modules
string superverbose;
if (s.verbose > 3)
superverbose = "set -x;";
string redirecterrors = "> /dev/null 2>&1";
if (s.verbose > 6)
redirecterrors = "";
// Support O= (or KBUILD_OUTPUT) option
o << "_KBUILD_CFLAGS := $(call flags,KBUILD_CFLAGS)" << endl;
o << "stap_check_gcc = $(shell " << superverbose
<< " if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; then "
<< "echo \"$(1)\"; else echo \"$(2)\"; fi)" << endl;
o << "CHECK_BUILD := $(CC) $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) $(CPPFLAGS) "
<< "$(LINUXINCLUDE) $(_KBUILD_CFLAGS) $(CFLAGS_KERNEL) $(EXTRA_CFLAGS) "
<< "$(CFLAGS) -DKBUILD_BASENAME=\\\"" << s.module_name << "\\\" "
<< WERROR << " -S -o /dev/null -xc " << endl;
o << "stap_check_build = $(shell " << superverbose << " if $(CHECK_BUILD) $(1) "
<< redirecterrors << " ; then echo \"$(2)\"; else echo \"$(3)\"; fi)" << endl;
o << "SYSTEMTAP_RUNTIME = \"" << s.runtime_path << "\"" << endl;
// "autoconf" options go here
// RHBZ 543529: early rhel6 kernels' module-signing kbuild logic breaks out-of-tree modules
o << "CONFIG_MODULE_SIG := n" << endl;
string module_cflags = "EXTRA_CFLAGS";
o << module_cflags << " :=" << endl;
// XXX: This gruesome hack is needed on some kernels built with separate O=directory,
// where files like 2.6.27 x86's asm/mach-*/mach_mpspec.h are not found on the cpp path.
// This could be a bug in arch/x86/Makefile that names
// mflags-y += -Iinclude/asm-x86/mach-default
// but that path does not exist in an O= build tree.
o << module_cflags << " += -Iinclude2/asm/mach-default" << endl;
o << module_cflags << " += -I" + s.kernel_build_tree << endl;
if (s.kernel_source_tree != "")
o << module_cflags << " += -I" + s.kernel_source_tree << endl;
for (unsigned i = 0; i < s.kernel_extra_cflags.size(); i++)
o << module_cflags << " += " + s.kernel_extra_cflags[i] << endl;
// NB: don't try
// o << module_cflags << " += -Iusr/include" << endl;
// since such headers are cleansed of _KERNEL_ pieces that we need
o << "STAPCONF_HEADER := " << s.tmpdir << "/" << s.stapconf_name << endl;
o << "$(STAPCONF_HEADER):" << endl;
o << "\t@> $@" << endl;
output_autoconf(s, o, "autoconf-hrtimer-rel.c", "STAPCONF_HRTIMER_REL", NULL);
output_exportconf(s, o, "hrtimer_get_res", "STAPCONF_HRTIMER_GET_RES");
output_autoconf(s, o, "autoconf-generated-compile.c", "STAPCONF_GENERATED_COMPILE", NULL);
output_autoconf(s, o, "autoconf-hrtimer-getset-expires.c", "STAPCONF_HRTIMER_GETSET_EXPIRES", NULL);
output_autoconf(s, o, "autoconf-inode-private.c", "STAPCONF_INODE_PRIVATE", NULL);
output_autoconf(s, o, "autoconf-inode-rwsem.c", "STAPCONF_INODE_RWSEM", NULL);
output_autoconf(s, o, "autoconf-constant-tsc.c", "STAPCONF_CONSTANT_TSC", NULL);
output_autoconf(s, o, "autoconf-ktime-get-real.c", "STAPCONF_KTIME_GET_REAL", NULL);
output_autoconf(s, o, "autoconf-x86-uniregs.c", "STAPCONF_X86_UNIREGS", NULL);
output_autoconf(s, o, "autoconf-nameidata.c", "STAPCONF_NAMEIDATA_CLEANUP", NULL);
output_dual_exportconf(s, o, "unregister_kprobes", "unregister_kretprobes", "STAPCONF_UNREGISTER_KPROBES");
output_autoconf(s, o, "autoconf-kprobe-symbol-name.c", "STAPCONF_KPROBE_SYMBOL_NAME", NULL);
output_autoconf(s, o, "autoconf-real-parent.c", "STAPCONF_REAL_PARENT", NULL);
output_autoconf(s, o, "autoconf-uaccess.c", "STAPCONF_LINUX_UACCESS_H", NULL);
output_autoconf(s, o, "autoconf-oneachcpu-retry.c", "STAPCONF_ONEACHCPU_RETRY", NULL);
output_autoconf(s, o, "autoconf-dpath-path.c", "STAPCONF_DPATH_PATH", NULL);
output_exportconf(s, o, "synchronize_kernel", "STAPCONF_SYNCHRONIZE_KERNEL");
output_exportconf(s, o, "synchronize_rcu", "STAPCONF_SYNCHRONIZE_RCU");
output_exportconf(s, o, "synchronize_sched", "STAPCONF_SYNCHRONIZE_SCHED");
output_autoconf(s, o, "autoconf-task-uid.c", "STAPCONF_TASK_UID", NULL);
output_autoconf(s, o, "autoconf-from_kuid_munged.c", "STAPCONF_FROM_KUID_MUNGED", NULL);
output_exportconf(s, o, "get_mm_exe_file", "STAPCONF_GET_MM_EXE_FILE");
output_dual_exportconf(s, o, "alloc_vm_area", "free_vm_area", "STAPCONF_VM_AREA");
output_autoconf(s, o, "autoconf-procfs-owner.c", "STAPCONF_PROCFS_OWNER", NULL);
output_autoconf(s, o, "autoconf-alloc-percpu-align.c", "STAPCONF_ALLOC_PERCPU_ALIGN", NULL);
output_autoconf(s, o, "autoconf-x86-fs.c", "STAPCONF_X86_FS", NULL);
output_autoconf(s, o, "autoconf-x86-xfs.c", "STAPCONF_X86_XFS", NULL);
output_autoconf(s, o, "autoconf-x86-gs.c", "STAPCONF_X86_GS", NULL);
output_autoconf(s, o, "autoconf-grsecurity.c", "STAPCONF_GRSECURITY", NULL);
output_autoconf(s, o, "autoconf-trace-printk.c", "STAPCONF_TRACE_PRINTK", NULL);
output_autoconf(s, o, "autoconf-regset.c", "STAPCONF_REGSET", NULL);
output_autoconf(s, o, "autoconf-utrace-regset.c", "STAPCONF_UTRACE_REGSET", NULL);
output_autoconf(s, o, "autoconf-uprobe-get-pc.c", "STAPCONF_UPROBE_GET_PC", NULL);
output_autoconf(s, o, "autoconf-hlist-4args.c", "STAPCONF_HLIST_4ARGS", NULL);
output_exportconf(s, o, "tsc_khz", "STAPCONF_TSC_KHZ");
output_exportconf(s, o, "cpu_khz", "STAPCONF_CPU_KHZ");
output_exportconf(s, o, "__module_text_address", "STAPCONF_MODULE_TEXT_ADDRESS");
output_exportconf(s, o, "add_timer_on", "STAPCONF_ADD_TIMER_ON");
output_dual_exportconf(s, o, "probe_kernel_read", "probe_kernel_write", "STAPCONF_PROBE_KERNEL");
output_autoconf(s, o, "autoconf-hw_breakpoint_context.c",
"STAPCONF_HW_BREAKPOINT_CONTEXT", NULL);
output_autoconf(s, o, "autoconf-save-stack-trace.c",
"STAPCONF_KERNEL_STACKTRACE", NULL);
output_autoconf(s, o, "autoconf-save-stack-trace-no-bp.c",
"STAPCONF_KERNEL_STACKTRACE_NO_BP", NULL);
output_autoconf(s, o, "autoconf-asm-syscall.c",
"STAPCONF_ASM_SYSCALL_H", NULL);
output_autoconf(s, o, "autoconf-ring_buffer-flags.c", "STAPCONF_RING_BUFFER_FLAGS", NULL);
output_autoconf(s, o, "autoconf-ring_buffer_lost_events.c", "STAPCONF_RING_BUFFER_LOST_EVENTS", NULL);
output_autoconf(s, o, "autoconf-ring_buffer_read_prepare.c", "STAPCONF_RING_BUFFER_READ_PREPARE", NULL);
output_autoconf(s, o, "autoconf-kallsyms-on-each-symbol.c", "STAPCONF_KALLSYMS_ON_EACH_SYMBOL", NULL);
output_autoconf(s, o, "autoconf-walk-stack.c", "STAPCONF_WALK_STACK", NULL);
output_autoconf(s, o, "autoconf-stacktrace_ops-warning.c",
"STAPCONF_STACKTRACE_OPS_WARNING", NULL);
output_autoconf(s, o, "autoconf-stacktrace_ops-int-address.c",
"STAPCONF_STACKTRACE_OPS_INT_ADDRESS", NULL);
output_autoconf(s, o, "autoconf-mm-context-vdso.c", "STAPCONF_MM_CONTEXT_VDSO", NULL);
output_autoconf(s, o, "autoconf-mm-context-vdso-base.c", "STAPCONF_MM_CONTEXT_VDSO_BASE", NULL);
output_autoconf(s, o, "autoconf-blk-types.c", "STAPCONF_BLK_TYPES", NULL);
output_autoconf(s, o, "autoconf-perf-structpid.c", "STAPCONF_PERF_STRUCTPID", NULL);
output_autoconf(s, o, "perf_event_counter_context.c",
"STAPCONF_PERF_COUNTER_CONTEXT", NULL);
output_autoconf(s, o, "perf_probe_handler_nmi.c",
"STAPCONF_PERF_HANDLER_NMI", NULL);
output_exportconf(s, o, "path_lookup", "STAPCONF_PATH_LOOKUP");
output_exportconf(s, o, "kern_path_parent", "STAPCONF_KERN_PATH_PARENT");
output_exportconf(s, o, "vfs_path_lookup", "STAPCONF_VFS_PATH_LOOKUP");
output_exportconf(s, o, "kern_path", "STAPCONF_KERN_PATH");
output_exportconf(s, o, "proc_create_data", "STAPCONF_PROC_CREATE_DATA");
output_exportconf(s, o, "PDE_DATA", "STAPCONF_PDE_DATA");
output_autoconf(s, o, "autoconf-module-sect-attrs.c", "STAPCONF_MODULE_SECT_ATTRS", NULL);
output_autoconf(s, o, "autoconf-utrace-via-tracepoints.c", "STAPCONF_UTRACE_VIA_TRACEPOINTS", NULL);
output_autoconf(s, o, "autoconf-task_work-struct.c", "STAPCONF_TASK_WORK_STRUCT", NULL);
output_autoconf(s, o, "autoconf-vm-area-pte.c", "STAPCONF_VM_AREA_PTE", NULL);
output_autoconf(s, o, "autoconf-relay-umode_t.c", "STAPCONF_RELAY_UMODE_T", NULL);
output_autoconf(s, o, "autoconf-relay_buf-per_cpu_ptr.c", "STAPCONF_RELAY_BUF_PER_CPU_PTR", NULL);
output_autoconf(s, o, "autoconf-fs_supers-hlist.c", "STAPCONF_FS_SUPERS_HLIST", NULL);
output_autoconf(s, o, "autoconf-compat_sigaction.c", "STAPCONF_COMPAT_SIGACTION", NULL);
output_autoconf(s, o, "autoconf-netfilter.c", "STAPCONF_NETFILTER_V313", NULL);
output_autoconf(s, o, "autoconf-netfilter-313b.c", "STAPCONF_NETFILTER_V313B", NULL);
output_autoconf(s, o, "autoconf-netfilter-4_1.c", "STAPCONF_NETFILTER_V41", NULL);
output_autoconf(s, o, "autoconf-netfilter-4_4.c", "STAPCONF_NETFILTER_V44", NULL);
output_autoconf(s, o, "autoconf-smpcall-5args.c", "STAPCONF_SMPCALL_5ARGS", NULL);
output_autoconf(s, o, "autoconf-smpcall-4args.c", "STAPCONF_SMPCALL_4ARGS", NULL);
output_autoconf(s, o, "autoconf-sched-mm.c", "STAPCONF_SCHED_MM_H", NULL);
output_autoconf(s, o, "autoconf-sched-task_stack.c", "STAPCONF_SCHED_TASK_STACK_H", NULL);
// used by tapset/timestamp_monotonic.stp
output_autoconf(s, o, "autoconf-cpu-clock.c", "STAPCONF_CPU_CLOCK", NULL);
output_autoconf(s, o, "autoconf-local-clock.c", "STAPCONF_LOCAL_CLOCK", NULL);
// used by runtime/uprobe-inode.c
output_either_exportconf(s, o, "uprobe_register", "register_uprobe",
"STAPCONF_UPROBE_REGISTER_EXPORTED");
output_either_exportconf(s, o, "uprobe_unregister", "unregister_uprobe",
"STAPCONF_UPROBE_UNREGISTER_EXPORTED");
output_autoconf(s, o, "autoconf-old-inode-uprobes.c", "STAPCONF_OLD_INODE_UPROBES", NULL);
output_autoconf(s, o, "autoconf-inode-uretprobes.c", "STAPCONF_INODE_URETPROBES", NULL);
// used by tapsets.cxx inode uprobe generated code
output_exportconf(s, o, "uprobe_get_swbp_addr", "STAPCONF_UPROBE_GET_SWBP_ADDR_EXPORTED");
// used by runtime/loc2c-runtime.h
output_exportconf(s, o, "task_user_regset_view", "STAPCONF_TASK_USER_REGSET_VIEW_EXPORTED");
// used by runtime/stp_utrace.c
output_exportconf(s, o, "task_work_add", "STAPCONF_TASK_WORK_ADD_EXPORTED");
output_exportconf(s, o, "wake_up_state", "STAPCONF_WAKE_UP_STATE_EXPORTED");
output_exportconf(s, o, "try_to_wake_up", "STAPCONF_TRY_TO_WAKE_UP_EXPORTED");
output_exportconf(s, o, "signal_wake_up_state", "STAPCONF_SIGNAL_WAKE_UP_STATE_EXPORTED");
output_exportconf(s, o, "signal_wake_up", "STAPCONF_SIGNAL_WAKE_UP_EXPORTED");
output_exportconf(s, o, "__lock_task_sighand", "STAPCONF___LOCK_TASK_SIGHAND_EXPORTED");
output_autoconf(s, o, "autoconf-pagefault_disable.c", "STAPCONF_PAGEFAULT_DISABLE", NULL);
output_exportconf(s, o, "kallsyms_lookup_name", "STAPCONF_KALLSYMS");
output_autoconf(s, o, "autoconf-uidgid.c", "STAPCONF_LINUX_UIDGID_H", NULL);
output_exportconf(s, o, "sigset_from_compat", "STAPCONF_SIGSET_FROM_COMPAT_EXPORTED");
output_exportconf(s, o, "vzalloc", "STAPCONF_VZALLOC");
output_exportconf(s, o, "vzalloc_node", "STAPCONF_VZALLOC_NODE");
output_exportconf(s, o, "vmalloc_node", "STAPCONF_VMALLOC_NODE");
// RHBZ1233912 - s390 temporary workaround for non-atomic udelay()
output_exportconf(s, o, "udelay_simple", "STAPCONF_UDELAY_SIMPLE");
output_autoconf(s, o, "autoconf-tracepoint-strings.c", "STAPCONF_TRACEPOINT_STRINGS", NULL);
output_autoconf(s, o, "autoconf-timerfd.c", "STAPCONF_TIMERFD_H", NULL);
output_autoconf(s, o, "autoconf-module_layout.c",
"STAPCONF_MODULE_LAYOUT", NULL);
output_autoconf(s, o, "autoconf-mod_kallsyms.c",
"STAPCONF_MOD_KALLSYMS", NULL);
output_exportconf(s, o, "get_user_pages_remote", "STAPCONF_GET_USER_PAGES_REMOTE");
output_autoconf(s, o, "autoconf-get_user_pages_remote-flags.c",
"STAPCONF_GET_USER_PAGES_REMOTE_FLAGS", NULL);
output_autoconf(s, o, "autoconf-get_user_pages_remote-flags_locked.c",
"STAPCONF_GET_USER_PAGES_REMOTE_FLAGS_LOCKED", NULL);
output_autoconf(s, o, "autoconf-uapi-linux-sched-types.c",
"STAPCONF_UAPI_LINUX_SCHED_TYPES", NULL);
// used by runtime/linux/netfilter.c
output_exportconf(s, o, "nf_register_hook", "STAPCONF_NF_REGISTER_HOOK");
o << module_cflags << " += -include $(STAPCONF_HEADER)" << endl;
for (unsigned i=0; i<s.c_macros.size(); i++)
o << "EXTRA_CFLAGS += -D " << lex_cast_qstring(s.c_macros[i]) << endl; // XXX right quoting?
if (s.verbose > 3)
o << "EXTRA_CFLAGS += -ftime-report -Q" << endl;
// XXX: unfortunately, -save-temps can't work since linux kbuild cwd
// is not writable.
//
// if (s.keep_tmpdir)
// o << "CFLAGS += -fverbose-asm -save-temps" << endl;
// Kernels can be compiled with CONFIG_CC_OPTIMIZE_FOR_SIZE to select
// -Os, otherwise -O2 is the default.
o << "EXTRA_CFLAGS += -freorder-blocks" << endl; // improve on -Os
// Generate eh_frame for self-backtracing
o << "EXTRA_CFLAGS += -fasynchronous-unwind-tables" << endl;
// We used to allow the user to override default optimization when so
// requested by adding a -O[0123s] so they could determine the
// time/space/speed tradeoffs themselves, but we cannot guantantee that
// the (un)optimized code actually compiles and/or generates functional
// code, so we had to remove it.
// o << "EXTRA_CFLAGS += " << s.gcc_flags << endl; // Add -O[0123s]
// o << "CFLAGS += -fno-unit-at-a-time" << endl;
// 256^W512 bytes should be enough for anybody
// XXX this doesn't validate varargs, per gcc bug #41633
o << "EXTRA_CFLAGS += $(call cc-option,-Wframe-larger-than=512)" << endl;
// gcc 5.0.0-0.13.fc23 ipa-icf seems to consume gigacpu on stap-generated code
o << "EXTRA_CFLAGS += $(call cc-option,-fno-ipa-icf)" << endl;
// Assumes linux 2.6 kbuild
o << "EXTRA_CFLAGS += -Wno-unused " << WERROR << endl;
#if CHECK_POINTER_ARITH_PR5947
o << "EXTRA_CFLAGS += -Wpointer-arith" << endl;
#endif
o << "EXTRA_CFLAGS += -I\"" << s.runtime_path << "\"" << endl;
// XXX: this may help ppc toc overflow
// o << "CFLAGS := $(subst -Os,-O2,$(CFLAGS)) -fminimal-toc" << endl;
o << "obj-m := " << s.module_name << ".o" << endl;
// print out all the auxiliary source (->object) file names
o << s.module_name << "-y := ";
for (unsigned i=0; i<s.auxiliary_outputs.size(); i++)
{
if (s.auxiliary_outputs[i]->trailer_p) continue;
string srcname = s.auxiliary_outputs[i]->filename;
assert (srcname != "" && srcname.rfind('/') != string::npos);
string objname = srcname.substr(srcname.rfind('/')+1); // basename
assert (objname != "" && objname[objname.size()-1] == 'c');
objname[objname.size()-1] = 'o'; // now objname
o << " " + objname;
}
// and once again, for the translated_source file. It can't simply
// be named MODULENAME.c, since kbuild doesn't allow a foo.ko file
// consisting of multiple .o's to have foo.o/foo.c as a source.
// (It uses ld -r -o foo.o EACH.o EACH.o).
{
string srcname = s.translated_source;
assert (srcname != "" && srcname.rfind('/') != string::npos);
string objname = srcname.substr(srcname.rfind('/')+1); // basename
assert (objname != "" && objname[objname.size()-1] == 'c');
objname[objname.size()-1] = 'o'; // now objname
o << " " + objname;
}
// and once again, for the trailer type auxiliary outputs.
for (unsigned i=0; i<s.auxiliary_outputs.size(); i++)
{
if (! s.auxiliary_outputs[i]->trailer_p) continue;
string srcname = s.auxiliary_outputs[i]->filename;
assert (srcname != "" && srcname.rfind('/') != string::npos);
string objname = srcname.substr(srcname.rfind('/')+1); // basename
assert (objname != "" && objname[objname.size()-1] == 'c');
objname[objname.size()-1] = 'o'; // now objname
o << " " + objname;
}
o << endl;
// add all stapconf dependencies
o << s.translated_source << ": $(STAPCONF_HEADER)" << endl;
for (unsigned i=0; i<s.auxiliary_outputs.size(); i++)
o << s.auxiliary_outputs[i]->filename << ": $(STAPCONF_HEADER)" << endl;
o.close ();
// Generate module directory pathname and make sure it exists.
string module_dir = s.kernel_build_tree;
string module_dir_makefile = module_dir + "/Makefile";
struct stat st;
rc = stat(module_dir_makefile.c_str(), &st);
if (rc != 0)
{
clog << _F("Checking \" %s \" failed with error: %s\nEnsure kernel development headers & makefiles are installed.",
module_dir_makefile.c_str(), strerror(errno)) << endl;
s.set_try_server ();
return rc;
}
// Run make
vector<string> make_cmd = make_make_cmd(s, s.tmpdir);
rc = run_make_cmd(s, make_cmd);
if (rc)
s.set_try_server ();
return rc;
}
/*
* If uprobes was built as part of the kernel build (either built-in
* or as a module), the uprobes exports should show up. This is to be
* as distinct from the stap-built uprobes.ko from the runtime.
*/
static bool
kernel_built_uprobes (systemtap_session& s)
{
if (s.runtime_usermode_p())
return true; // sort of, via dyninst
// see also tapsets.cxx:kernel_supports_inode_uprobes()
return ((s.kernel_config["CONFIG_ARCH_SUPPORTS_UPROBES"] == "y" && s.kernel_config["CONFIG_UPROBES"] == "y") ||
(s.kernel_exports.find("unregister_uprobe") != s.kernel_exports.end()));
}
static int
make_uprobes (systemtap_session& s)
{
if (s.verbose > 1)
clog << _("Pass 4, preamble: (re)building SystemTap's version of uprobes.")
<< endl;
// create a subdirectory for the uprobes module
string dir(s.tmpdir + "/uprobes");
if (create_dir(dir.c_str()) != 0)
{
s.print_warning("failed to create directory for build uprobes.");
s.set_try_server ();
return 1;
}
// create a simple Makefile
string makefile(dir + "/Makefile");
ofstream omf(makefile.c_str());
omf << "obj-m := uprobes.o" << endl;
// RHBZ 655231: later rhel6 kernels' module-signing kbuild logic breaks out-of-tree modules
omf << "CONFIG_MODULE_SIG := n" << endl;
omf.close();
// create a simple #include-chained source file
string runtimesourcefile(s.runtime_path + "/linux/uprobes/uprobes.c");
string sourcefile(dir + "/uprobes.c");
ofstream osrc(sourcefile.c_str());
osrc << "#include \"" << runtimesourcefile << "\"" << endl;
// pass --modinfo k=v to uprobes build too
for (unsigned i = 0; i < s.modinfos.size(); i++)
{
const string& mi = s.modinfos[i];
size_t loc = mi.find('=');
string tag = mi.substr (0, loc);
string value = mi.substr (loc+1);
osrc << "MODULE_INFO(" << tag << "," << lex_cast_qstring(value) << ");" << endl;
}
osrc.close();
// make the module
vector<string> make_cmd = make_make_cmd(s, dir);
int rc = run_make_cmd(s, make_cmd);
if (!rc && !copy_file(dir + "/Module.symvers",
s.tmpdir + "/Module.symvers"))
rc = -1;
if (s.verbose > 1)
clog << _("uprobes rebuild exit code: ") << rc << endl;
if (rc)
s.set_try_server ();
else
s.uprobes_path = dir + "/uprobes.ko";
return rc;
}
static bool
get_cached_uprobes(systemtap_session& s)
{
s.uprobes_hash = s.use_cache ? find_uprobes_hash(s) : "";
if (!s.uprobes_hash.empty())
{
// NB: We always put uprobes.ko in its own directory, especially so
// stap-serverd can more easily locate it.
string dir(s.tmpdir + "/uprobes");
if (create_dir(dir.c_str()) != 0)
return false;
string cacheko = s.uprobes_hash + ".ko";
string tmpko = dir + "/uprobes.ko";
// The symvers file still needs to go in the script module's directory.
string cachesyms = s.uprobes_hash + ".symvers";
string tmpsyms = s.tmpdir + "/Module.symvers";
if (get_file_size(cacheko) > 0 && copy_file(cacheko, tmpko) &&
get_file_size(cachesyms) > 0 && copy_file(cachesyms, tmpsyms))
{
s.uprobes_path = tmpko;
return true;
}
}
return false;
}
static void
set_cached_uprobes(systemtap_session& s)
{
if (s.use_cache && !s.uprobes_hash.empty())
{
string cacheko = s.uprobes_hash + ".ko";
string tmpko = s.tmpdir + "/uprobes/uprobes.ko";
copy_file(tmpko, cacheko);
string cachesyms = s.uprobes_hash + ".symvers";
string tmpsyms = s.tmpdir + "/uprobes/Module.symvers";
copy_file(tmpsyms, cachesyms);
}
}
int
uprobes_pass (systemtap_session& s)
{
if (!s.need_uprobes || kernel_built_uprobes(s))
return 0;
if (s.kernel_config["CONFIG_UTRACE"] != string("y"))
{
clog << _("user-space process-tracking facilities not available [man error::process-tracking]") << endl;
s.set_try_server ();
return 1;
}
/*
* We need to use the version of uprobes that comes with SystemTap. Try to
* get it from the cache first. If not found, build it and try to save it to
* the cache for future reuse.
*/
int rc = 0;
if (!get_cached_uprobes(s))
{
rc = make_uprobes(s);
if (!rc)
set_cached_uprobes(s);
}
if (rc)
s.set_try_server ();
return rc;
}
static vector<string>
make_dyninst_run_command (systemtap_session& s, const string& remotedir,
const string&)
{
vector<string> cmd { getenv("SYSTEMTAP_STAPDYN") ?: BINDIR "/stapdyn" };
// use slightly less verbosity
if (s.verbose > 0)
cmd.insert(cmd.end(), s.verbose - 1, "-v");
if (s.suppress_warnings)
cmd.push_back("-w");
if (!s.cmd.empty())
cmd.insert(cmd.end(), { "-c", s.cmd });
if (s.target_pid)
cmd.insert(cmd.end(), { "-x", lex_cast(s.target_pid) });
if (!s.output_file.empty())
cmd.insert(cmd.end(), { "-o", s.output_file });
if (s.color_mode != s.color_auto)
{
auto mode = s.color_mode == s.color_always ? "always" : "never";
cmd.insert(cmd.end(), { "-C", mode });
}
cmd.push_back((remotedir.empty() ? s.tmpdir : remotedir)
+ "/" + s.module_filename());
// add module arguments
cmd.insert(cmd.end(), s.globalopts.begin(), s.globalopts.end());
return cmd;
}
static vector<string>
make_kernel_run_command (systemtap_session& s, const string& remotedir,
const string& version)
{
// for now, just spawn staprun
vector<string> cmd { getenv("SYSTEMTAP_STAPRUN") ?: BINDIR "/staprun" };
// use slightly less verbosity
if (s.verbose > 0)
cmd.insert(cmd.end(), s.verbose - 1, "-v");
if (s.suppress_warnings)
cmd.push_back("-w");
if (!s.output_file.empty())
cmd.insert(cmd.end(), { "-o", s.output_file });
if (!s.cmd.empty())
cmd.insert(cmd.end(), { "-c", s.cmd });
if (s.target_pid)
cmd.insert(cmd.end(), { "-t", lex_cast(s.target_pid) });
if (s.target_namespaces_pid)
cmd.insert(cmd.end(), { "-N", lex_cast(s.target_namespaces_pid) });
if (s.buffer_size)
cmd.insert(cmd.end(), { "-b", lex_cast(s.buffer_size) });
if (s.read_stdin)
cmd.insert(cmd.end(), "-i");
if (s.need_uprobes && !kernel_built_uprobes(s))
{
string opt_u = "-u";
if (!s.uprobes_path.empty() &&
strverscmp("1.4", version.c_str()) <= 0)
{
if (remotedir.empty())
opt_u.append(s.uprobes_path);
else
opt_u.append(remotedir + "/" + basename(s.uprobes_path.c_str()));
}
cmd.push_back(opt_u);
}
if (s.load_only)
cmd.push_back(s.output_file.empty() ? "-L" : "-D");
// Note that if this system requires signed modules, we can't rename
// it after it has been signed.
if (!s.modname_given && (strverscmp("1.6", version.c_str()) <= 0)
&& s.mok_fingerprints.empty())
cmd.push_back("-R");
if (!s.size_option.empty())
cmd.insert(cmd.end(), { "-S", s.size_option });
if (s.color_mode != s.color_auto)
{
auto mode = s.color_mode == s.color_always ? "always" : "never";
cmd.insert(cmd.end(), { "-C", mode });
}
if (s.monitor)
cmd.insert(cmd.end(), { "-M", lex_cast(s.monitor_interval) });
cmd.push_back((remotedir.empty() ? s.tmpdir : remotedir)
+ "/" + s.module_filename());
// add module arguments
cmd.insert(cmd.end(), s.globalopts.begin(), s.globalopts.end());
return cmd;
}
static vector<string>
make_bpf_run_command (systemtap_session& s, const string& remotedir,
const string&)
{
vector<string> cmd;
cmd.push_back(getenv("SYSTEMTAP_STAPBPF") ?: BINDIR "/stapbpf");
for (unsigned i=1; i<s.verbose; i++)
cmd.push_back("-v");
if (s.suppress_warnings)
cmd.push_back("-w");
if (!s.output_file.empty())
{
cmd.push_back("-o");
cmd.push_back(s.output_file);
}
cmd.push_back((remotedir.empty() ? s.tmpdir : remotedir)
+ "/" + s.module_filename());
// FIXME add module arguments
// ??? Maybe insert these via BEGIN probe.
// cmd.insert(cmd.end(), s.globalopts.begin(), s.globalopts.end());
return cmd;
}
vector<string>
make_run_command (systemtap_session& s, const string& remotedir,
const string& version)
{
switch (s.runtime_mode)
{
case systemtap_session::kernel_runtime:
return make_kernel_run_command (s, remotedir, version);
case systemtap_session::dyninst_runtime:
return make_dyninst_run_command(s, remotedir, version);
case systemtap_session::bpf_runtime:
return make_bpf_run_command(s, remotedir, version);
default:
abort();
}
}
// Build tiny kernel modules to query tracepoints.
// Given a (header-file -> test-contents) map, compile them ASAP, and return
// a (header-file -> obj-filename) map.
map<string,string>
make_tracequeries(systemtap_session& s, const map<string,string>& contents)
{
static unsigned tick = 0;
string basename("tracequery_kmod_" + lex_cast(++tick));
map<string,string> objs;
// create a subdirectory for the module
string dir(s.tmpdir + "/" + basename);
if (create_dir(dir.c_str()) != 0)
{
s.print_warning("failed to create directory for querying tracepoints.");
s.set_try_server ();
return objs;
}
// create a simple Makefile
string makefile(dir + "/Makefile");
ofstream omf(makefile.c_str());
// force debuginfo generation, and relax implicit functions
omf << "EXTRA_CFLAGS := -g -Wno-implicit-function-declaration " << WERROR << endl;
// RHBZ 655231: later rhel6 kernels' module-signing kbuild logic breaks out-of-tree modules
omf << "CONFIG_MODULE_SIG := n" << endl;
// PR18389: disable GCC's Identical Code Folding, since the stubs may look identical
omf << "EXTRA_CFLAGS += $(call cc-option,-fno-ipa-icf)" << endl;
omf << "EXTRA_CFLAGS += -I" + s.kernel_build_tree << endl;
if (s.kernel_source_tree != "")
omf << "EXTRA_CFLAGS += -I" + s.kernel_source_tree << endl;
for (unsigned i = 0; i < s.kernel_extra_cflags.size(); i++)
omf << "EXTRA_CFLAGS += " + s.kernel_extra_cflags[i] << endl;
omf << "obj-m := " << endl;
// write out each header-specific source file into a separate file
for (map<string,string>::const_iterator it = contents.begin(); it != contents.end(); it++)
{
string sbasename = basename + "_" + lex_cast(++tick); // suffixed
// write out source code
string srcname = dir + "/" + sbasename + ".c";
string src = it->second;
ofstream osrc(srcname.c_str());
osrc << src;
osrc.close();
if (s.verbose > 2)
clog << _F("Processing tracepoint header %s with query %s",
it->first.c_str(), srcname.c_str())
<< endl;
// arrange to build it
omf << "obj-m += " + sbasename + ".o" << endl; // NB: without <dir> prefix
objs[it->first] = dir + "/" + sbasename + ".o";
}
omf.close();
// make the module
vector<string> make_cmd = make_make_objs_cmd(s, dir);
make_cmd.push_back ("-i"); // ignore errors, give rc 0 even in case of tracepoint header nits
bool quiet = (s.verbose < 4);
int rc = run_make_cmd(s, make_cmd, quiet, quiet);
if (rc)
s.set_try_server ();
// Sometimes we fail a tracequery due to PR9993 / PR11649 type
// kernel trace header problems. In this case, due to PR12729, we
// used to get a lovely "Warning: make exited with status: 2" but no
// other useful diagnostic. -vvvv would let a user see what's up,
// but the user can't fix the problem even with that.
return objs;
}
// Build a tiny kernel module to query type information
static int
make_typequery_kmod(systemtap_session& s, const vector<string>& headers, string& name)
{
static unsigned tick = 0;
string basename("typequery_kmod_" + lex_cast(++tick));
// create a subdirectory for the module
string dir(s.tmpdir + "/" + basename);
if (create_dir(dir.c_str()) != 0)
{
s.print_warning("failed to create directory for querying types.");
s.set_try_server ();
return 1;
}
name = dir + "/" + basename + ".ko";
// create a simple Makefile
string makefile(dir + "/Makefile");
ofstream omf(makefile.c_str());
omf << "EXTRA_CFLAGS := -g -fno-eliminate-unused-debug-types" << endl;
// RHBZ 655231: later rhel6 kernels' module-signing kbuild logic breaks out-of-tree modules
omf << "CONFIG_MODULE_SIG := n" << endl;
// NB: We use -include instead of #include because that gives us more power.
// Using #include searches relative to the source's path, which in this case
// is /tmp/..., so that's not helpful. Using -include will search relative
// to the cwd, which will be the kernel build root. This means if you have a
// full kernel build tree, it's possible to get at types that aren't in the
// normal include path, e.g.:
// @cast(foo, "bsd_acct_struct", "kernel<kernel/acct.c>")->...
omf << "CFLAGS_" << basename << ".o :=";