linux-kernel - [PATCH v4 09/12] powerpc/tracing: fix compat syscall handling

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Message-ID: <1476434115-25428-11-git-send-email-marcin.nowakowski@imgtec.com>
Date:   Fri, 14 Oct 2016 10:35:12 +0200
From:   Marcin Nowakowski <marcin.nowakowski@...tec.com>
To:     <linux-kernel@...r.kernel.org>
CC:     <linux-api@...r.kernel.org>, <luto@...capital.net>,
        <rostedt@...dmis.org>,
        Marcin Nowakowski <marcin.nowakowski@...tec.com>,
        Ingo Molnar <mingo@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        "Paul Mackerras" <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        <linuxppc-dev@...ts.ozlabs.org>
Subject: [PATCH v4 09/12] powerpc/tracing: fix compat syscall handling

Adapt the code to make use of new syscall handling interface

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@...tec.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Michael Ellerman <mpe@...erman.id.au>
Cc: linuxppc-dev@...ts.ozlabs.org
---
 arch/powerpc/include/asm/ftrace.h | 13 +++++++++++++
 arch/powerpc/kernel/ftrace.c      |  4 ++++
 2 files changed, 17 insertions(+)

diff --git a/arch/powerpc/include/asm/ftrace.h b/arch/powerpc/include/asm/ftrace.h
index f266051..c6c660d 100644
--- a/arch/powerpc/include/asm/ftrace.h
+++ b/arch/powerpc/include/asm/ftrace.h
@@ -72,4 +72,17 @@ struct dyn_arch_ftrace {
 #define ARCH_SYM_NAME_SKIP_CHARS 1
 #endif
 
+#if defined(CONFIG_FTRACE_SYSCALLS) && !defined(__ASSEMBLY__)
+#if defined(CONFIG_COMPAT)
+#include <linux/compat.h>
+#include <asm/compat.h>
+
+#define ARCH_COMPAT_SYSCALL_NUMBERS_OVERLAP 1
+static inline bool arch_trace_is_compat_syscall(struct pt_regs *regs)
+{
+	return in_compat_syscall();
+}
+#endif /* CONFIG_COMPAT */
+#endif /* CONFIG_FTRACE_SYSCALLS && !__ASSEMBLY__ */
+
 #endif /* _ASM_POWERPC_FTRACE */
diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index 5bfb35f..12c00f7 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -606,6 +606,10 @@ unsigned long prepare_ftrace_return(unsigned long parent, unsigned long ip)
 #if defined(CONFIG_FTRACE_SYSCALLS) && defined(CONFIG_PPC64)
 unsigned long __init arch_syscall_addr(int nr, bool compat)
 {
+#ifdef CONFIG_COMPAT
+	if (compat)
+		return sys_call_table[nr*2+1];
+#endif
 	return sys_call_table[nr*2];
 }
 #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 */
-- 
2.7.4