[PATCH 21/40] trace syscalls, PPC: Add ftrace compat syscall support for PPC64

[Ian Munsie]

From: Ian Munsie <imunsie@xxxxxxxxxxx>

This patch adds the necessary infrastructure to trace 32bit compat
syscalls on PowerPC64.

Signed-off-by: Ian Munsie <imunsie@xxxxxxxxxxx>
---
 arch/powerpc/Kconfig              |    1 +
 arch/powerpc/include/asm/unistd.h |    4 ++++
 arch/powerpc/kernel/ftrace.c      |    7 +++++++
 3 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 0d5c28d..a724c93 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -142,6 +142,7 @@ config PPC
 	select HAVE_PERF_EVENTS
 	select HAVE_REGS_AND_STACK_ACCESS_API
 	select HAVE_SYSCALL_TRACEPOINTS
+	select HAVE_COMPAT_FTRACE_SYSCALLS if PPC64
 
 config EARLY_PRINTK
 	bool
diff --git a/arch/powerpc/include/asm/unistd.h b/arch/powerpc/include/asm/unistd.h
index f0a1026..f584b71 100644
--- a/arch/powerpc/include/asm/unistd.h
+++ b/arch/powerpc/include/asm/unistd.h
@@ -353,6 +353,10 @@
 #define __NR__exit __NR_exit
 #define NR_syscalls	__NR_syscalls
 
+#ifdef CONFIG_PPC64
+#define NR_syscalls_compat NR_syscalls
+#endif
+
 #ifndef __ASSEMBLY__
 
 #include <linux/types.h>
diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index f5fadbb..dddbc33 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -619,3 +619,10 @@ inline bool arch_syscall_match_sym_name(const char *sym, const char *name)
 	return (!strcmp(sym + 4, name + 3));
 }
 #endif /* CONFIG_FTRACE_SYSCALLS && CONFIG_PPC64 */
+
+#ifdef CONFIG_COMPAT_FTRACE_SYSCALLS
+unsigned long __init arch_compat_syscall_addr(int nr)
+{
+	return sys_call_table[nr*2+1];
+}
+#endif
-- 
1.7.1

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