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authorWade Farnsworth <wade_farnsworth@mentor.com>2012-09-07 18:18:25 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-09-19 21:50:48 +0100
commit1f66e06fb6414732bef7bf4a071ef76a837badec (patch)
tree329bd62fd3ce0c1f55242549f8486f5b168f4bce /arch/arm/kernel
parent5698bd757d55b1bb87edd1a9744ab09c142abfc2 (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.S9
-rw-r--r--arch/arm/kernel/ptrace.c11
2 files changed, 18 insertions, 2 deletions
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index 978eac57e04..f45987037bf 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 3e0fc5f7ed4..c382d3c76ac 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;
}