Commit 1c758a22 authored by Steven Rostedt (VMware)'s avatar Steven Rostedt (VMware)
Browse files

tracing/x86: Update syscall trace events to handle new prefixed syscall func names

Arnaldo noticed that the latest kernel is missing the syscall event system
directory in x86. I bisected it down to d5a00528 ("syscalls/core,
syscalls/x86: Rename struct pt_regs-based sys_*() to __x64_sys_*()").

The system call trace events are special, as there is only one trace event
for all system calls (the raw_syscalls). But a macro that wraps the system
calls creates meta data for them that copies the name to find the system
call that maps to the system call table (the number). At boot up, it does a
kallsyms lookup of the system call table to find the function that maps to
the meta data of the system call. If it does not find a function, then that
system call is ignored.

Because the x86 system calls had "__x64_", or "__ia32_" prefixed to the
"sys" for the names, they do not match the default compare algorithm. As
this was a problem for power pc, the algorithm can be overwritten by the
architecture. The solution is to have x86 have its own algorithm to do the
compare and this brings back the system call trace events.

Link: http://lkml.kernel.org/r/20180417174128.0f3457f0@gandalf.local.home

Reported-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: default avatarDominik Brodowski <linux@dominikbrodowski.net>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Fixes: d5a00528

 ("syscalls/core, syscalls/x86: Rename struct pt_regs-based sys_*() to __x64_sys_*()")
Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
parent 1cdae042
......@@ -46,7 +46,21 @@ int ftrace_int3_handler(struct pt_regs *regs);
#endif /* CONFIG_FUNCTION_TRACER */
#if !defined(__ASSEMBLY__) && !defined(COMPILE_OFFSETS)
#ifndef __ASSEMBLY__
#define ARCH_HAS_SYSCALL_MATCH_SYM_NAME
static inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
{
/*
* Compare the symbol name with the system call name. Skip the
* "__x64_sys", "__ia32_sys" or simple "sys" prefix.
*/
return !strcmp(sym + 3, name + 3) ||
(!strncmp(sym, "__x64_", 6) && !strcmp(sym + 9, name + 3)) ||
(!strncmp(sym, "__ia32_", 7) && !strcmp(sym + 10, name + 3));
}
#ifndef COMPILE_OFFSETS
#if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_IA32_EMULATION)
#include <asm/compat.h>
......@@ -67,6 +81,7 @@ static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
return false;
}
#endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_IA32_EMULATION */
#endif /* !__ASSEMBLY__ && !COMPILE_OFFSETS */
#endif /* !COMPILE_OFFSETS */
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_X86_FTRACE_H */
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