tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
MIPS: ftrace: Add support for syscall tracepoints.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
+43
-3
+1
arch/mips/Kconfig
+1
arch/mips/Kconfig
+19
arch/mips/include/asm/syscall.h
+19
arch/mips/include/asm/syscall.h
···
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}
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->regs[2];
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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if (error) {
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regs->regs[2] = -error;
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regs->regs[7] = -1;
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} else {
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regs->regs[2] = val;
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regs->regs[7] = 0;
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}
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
+6
-3
arch/mips/include/asm/thread_info.h
+6
-3
arch/mips/include/asm/thread_info.h
···
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#define TIF_32BIT_ADDR 23 /* 32-bit address space (o32/n32) */
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#define TIF_FPUBOUND 24 /* thread bound to FPU-full CPU set */
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#define TIF_LOAD_WATCH 25 /* If set, load watch registers */
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#define TIF_SYSCALL_TRACEPOINT 26 /* syscall tracepoint instrumentation */
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#define TIF_SYSCALL_TRACE 31 /* syscall trace active */
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#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
···
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#define _TIF_32BIT_ADDR (1<<TIF_32BIT_ADDR)
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#define _TIF_FPUBOUND (1<<TIF_FPUBOUND)
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#define _TIF_LOAD_WATCH (1<<TIF_LOAD_WATCH)
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#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
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#define _TIF_WORK_SYSCALL_ENTRY (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
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-
_TIF_SYSCALL_AUDIT)
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_TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
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/* work to do in syscall_trace_leave() */
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#define _TIF_WORK_SYSCALL_EXIT (_TIF_NOHZ | _TIF_SYSCALL_TRACE | \
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-
_TIF_SYSCALL_AUDIT)
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_TIF_SYSCALL_AUDIT | _TIF_SYSCALL_TRACEPOINT)
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/* work to do on interrupt/exception return */
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#define _TIF_WORK_MASK \
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(_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
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/* work to do on any return to u-space */
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#define _TIF_ALLWORK_MASK (_TIF_NOHZ | _TIF_WORK_MASK | \
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-
_TIF_WORK_SYSCALL_EXIT)
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_TIF_WORK_SYSCALL_EXIT | \
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_TIF_SYSCALL_TRACEPOINT)
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/*
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* We stash processor id into a COP0 register to retrieve it fast
+7
arch/mips/include/asm/unistd.h
+7
arch/mips/include/asm/unistd.h
···
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#include <uapi/asm/unistd.h>
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#ifdef CONFIG_MIPS32_N32
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#define NR_syscalls (__NR_N32_Linux + __NR_N32_Linux_syscalls)
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#elif defined(CONFIG_64BIT)
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#define NR_syscalls (__NR_64_Linux + __NR_64_Linux_syscalls)
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#else
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#define NR_syscalls (__NR_O32_Linux + __NR_O32_Linux_syscalls)
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#endif
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#ifndef __ASSEMBLY__
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+10
arch/mips/kernel/ptrace.c
+10
arch/mips/kernel/ptrace.c
···
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#include <linux/tracehook.h>
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#include <linux/audit.h>
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#include <linux/seccomp.h>
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#include <linux/ftrace.h>
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#include <asm/byteorder.h>
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#include <asm/cpu.h>
···
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#include <asm/uaccess.h>
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#include <asm/bootinfo.h>
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#include <asm/reg.h>
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#define CREATE_TRACE_POINTS
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#include <trace/events/syscalls.h>
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/*
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* Called by kernel/ptrace.c when detaching..
···
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tracehook_report_syscall_entry(regs))
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ret = -1;
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+
if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
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trace_sys_enter(regs, regs->regs[2]);
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+
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audit_syscall_entry(__syscall_get_arch(),
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regs->regs[2],
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regs->regs[4], regs->regs[5],
···
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user_exit();
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audit_syscall_exit(regs);
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if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
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trace_sys_exit(regs, regs->regs[2]);
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall_exit(regs, 0);