diff options
| author | Ian Munsie <imunsie@au.ibm.com> | 2011-02-02 17:27:24 (GMT) |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-05-26 03:38:57 (GMT) |
| commit | 02424d8966d803e33cbe51469be56b5d177b4a37 (patch) | |
| tree | 9bf4f118b92c912dc45a2a93a751c18deff4a00c /arch/powerpc/kernel/ptrace.c | |
| parent | 3f5785ec31adcb7cafa9135087297a38d9698cf8 (diff) | |
| download | linux-02424d8966d803e33cbe51469be56b5d177b4a37.tar.xz | |
powerpc/ftrace: Implement raw syscall tracepoints on PowerPC
This patch implements the raw syscall tracepoints on PowerPC and exports
them for ftrace syscalls to use.
To minimise reworking existing code, I slightly re-ordered the thread
info flags such that the new TIF_SYSCALL_TRACEPOINT bit would still fit
within the 16 bits of the andi. instruction's UI field. The instructions
in question are in /arch/powerpc/kernel/entry_{32,64}.S to and the
_TIF_SYSCALL_T_OR_A with the thread flags to see if system call tracing
is enabled.
In the case of 64bit PowerPC, arch_syscall_addr and
arch_syscall_match_sym_name are overridden to allow ftrace syscalls to
work given the unusual system call table structure and symbol names that
start with a period.
Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/ptrace.c')
| -rw-r--r-- | arch/powerpc/kernel/ptrace.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c index a6ae1cf..cb22024 100644 --- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -29,6 +29,7 @@ #include <linux/signal.h> #include <linux/seccomp.h> #include <linux/audit.h> +#include <trace/syscall.h> #ifdef CONFIG_PPC32 #include <linux/module.h> #endif @@ -40,6 +41,9 @@ #include <asm/pgtable.h> #include <asm/system.h> +#define CREATE_TRACE_POINTS +#include <trace/events/syscalls.h> + /* * The parameter save area on the stack is used to store arguments being passed * to callee function and is located at fixed offset from stack pointer. @@ -1710,6 +1714,9 @@ long do_syscall_trace_enter(struct pt_regs *regs) */ ret = -1L; + if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) + trace_sys_enter(regs, regs->gpr[0]); + if (unlikely(current->audit_context)) { #ifdef CONFIG_PPC64 if (!is_32bit_task()) @@ -1738,6 +1745,9 @@ void do_syscall_trace_leave(struct pt_regs *regs) audit_syscall_exit((regs->ccr&0x10000000)?AUDITSC_FAILURE:AUDITSC_SUCCESS, regs->result); + if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) + trace_sys_exit(regs, regs->result); + step = test_thread_flag(TIF_SINGLESTEP); if (step || test_thread_flag(TIF_SYSCALL_TRACE)) tracehook_report_syscall_exit(regs, step); |