diff options
| author | Wade Farnsworth <wade_farnsworth@mentor.com> | 2012-09-07 18:18:25 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-09-19 21:50:48 +0100 |
| commit | 1f66e06fb6414732bef7bf4a071ef76a837badec (patch) | |
| tree | 329bd62fd3ce0c1f55242549f8486f5b168f4bce /arch/arm/kernel | |
| parent | 5698bd757d55b1bb87edd1a9744ab09c142abfc2 (diff) | |
ARM: 7524/1: support syscall tracing
As specified by ftrace-design.txt, TIF_SYSCALL_TRACEPOINT was
added, as well as NR_syscalls in asm/unistd.h. Additionally,
__sys_trace was modified to call trace_sys_enter and
trace_sys_exit when appropriate.
Tests #2 - #4 of "perf test" now complete successfully.
Signed-off-by: Steven Walter <stevenrwalter@gmail.com>
Signed-off-by: Wade Farnsworth <wade_farnsworth@mentor.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel')
| -rw-r--r-- | arch/arm/kernel/entry-common.S | 9 | ||||
| -rw-r--r-- | arch/arm/kernel/ptrace.c | 11 |
2 files changed, 18 insertions, 2 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S index 978eac57e04a..f45987037bf1 100644 --- a/arch/arm/kernel/entry-common.S +++ b/arch/arm/kernel/entry-common.S @@ -94,6 +94,15 @@ ENDPROC(ret_from_fork) .equ NR_syscalls,0 #define CALL(x) .equ NR_syscalls,NR_syscalls+1 #include "calls.S" + +/* + * Ensure that the system call table is equal to __NR_syscalls, + * which is the value the rest of the system sees + */ +.ifne NR_syscalls - __NR_syscalls +.error "__NR_syscalls is not equal to the size of the syscall table" +.endif + #undef CALL #define CALL(x) .long x diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c index 3e0fc5f7ed4b..c382d3c76ac6 100644 --- a/arch/arm/kernel/ptrace.c +++ b/arch/arm/kernel/ptrace.c @@ -30,6 +30,9 @@ #include <asm/pgtable.h> #include <asm/traps.h> +#define CREATE_TRACE_POINTS +#include <trace/events/syscalls.h> + #define REG_PC 15 #define REG_PSR 16 /* @@ -918,11 +921,11 @@ static int ptrace_syscall_trace(struct pt_regs *regs, int scno, { unsigned long ip; + current_thread_info()->syscall = scno; + if (!test_thread_flag(TIF_SYSCALL_TRACE)) return scno; - current_thread_info()->syscall = scno; - /* * IP is used to denote syscall entry/exit: * IP = 0 -> entry, =1 -> exit @@ -942,6 +945,8 @@ static int ptrace_syscall_trace(struct pt_regs *regs, int scno, asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno) { int ret = ptrace_syscall_trace(regs, scno, PTRACE_SYSCALL_ENTER); + if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) + trace_sys_enter(regs, ret); audit_syscall_entry(AUDIT_ARCH_ARM, scno, regs->ARM_r0, regs->ARM_r1, regs->ARM_r2, regs->ARM_r3); return ret; @@ -950,6 +955,8 @@ asmlinkage int syscall_trace_enter(struct pt_regs *regs, int scno) asmlinkage int syscall_trace_exit(struct pt_regs *regs, int scno) { int ret = ptrace_syscall_trace(regs, scno, PTRACE_SYSCALL_EXIT); + if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) + trace_sys_exit(regs, ret); audit_syscall_exit(regs); return ret; } |