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011ea0501d
Some of the system calls that read a fixed length of memory from the user space address are not arrays but strings. Take a bit away from the nb_args field in the syscall meta data to use as a flag to denote that the system call's user_arg_size is being used as a string. The nb_args should never be more than 6, so 7 bits is plenty to hold that number. When the user_arg_is_str flag that, when set, will display the data array from the user space address as a string and not an array. This will allow the output to look like this: sys_sethostname(name: 0x5584310eb2a0 "debian", len: 6) Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Takaya Saeki <takayas@google.com> Cc: Tom Zanussi <zanussi@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ian Rogers <irogers@google.com> Cc: Douglas Raillard <douglas.raillard@arm.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Ingo Molnar <mingo@redhat.com> Link: https://lore.kernel.org/20251028231147.930550359@kernel.org Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _TRACE_SYSCALL_H
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#define _TRACE_SYSCALL_H
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#include <linux/tracepoint.h>
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#include <linux/unistd.h>
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#include <linux/trace_events.h>
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#include <linux/thread_info.h>
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#include <asm/ptrace.h>
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/*
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* A syscall entry in the ftrace syscalls array.
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*
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* @name: name of the syscall
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* @syscall_nr: number of the syscall
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* @nb_args: number of parameters it takes
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* @user_arg_is_str: set if the arg for @user_arg_size is a string
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* @user_arg_size: holds @arg that has size of the user space to read
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* @user_mask: mask of @args that will read user space
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* @types: list of types as strings
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* @args: list of args as strings (args[i] matches types[i])
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* @enter_fields: list of fields for syscall_enter trace event
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* @enter_event: associated syscall_enter trace event
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* @exit_event: associated syscall_exit trace event
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*/
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struct syscall_metadata {
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const char *name;
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int syscall_nr;
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u8 nb_args:7;
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u8 user_arg_is_str:1;
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s8 user_arg_size;
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short user_mask;
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const char **types;
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const char **args;
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struct list_head enter_fields;
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struct trace_event_call *enter_event;
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struct trace_event_call *exit_event;
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};
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#if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_HAVE_SYSCALL_TRACEPOINTS)
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static inline void syscall_tracepoint_update(struct task_struct *p)
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{
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if (test_syscall_work(SYSCALL_TRACEPOINT))
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set_task_syscall_work(p, SYSCALL_TRACEPOINT);
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else
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clear_task_syscall_work(p, SYSCALL_TRACEPOINT);
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}
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#else
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static inline void syscall_tracepoint_update(struct task_struct *p)
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{
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}
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#endif
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#endif /* _TRACE_SYSCALL_H */
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