[PATCH 2/4] powerpc: Fix longlong args handling

[Anton Vorontsov]

When probing 32-bits apps on ppc64 or running native ppc32, int64
parts are stored in the big endian order, e.g. foo(1LL, 2LL, 3LL)'s
args turn into:

arg1: r3 = 0; r4 = 1
arg2: r5 = 0; r6 = 2
arg3: r7 = 0; r8 = 3

For example, to restore arg1 the current longlong_arg() will perform
(r4 << 32) | r3, which is obviously incorrect. And to restore arg2 it
will do (r5 << 32) | r4, which doesn't look right as well.

This patch fixes the issue.

Signed-off-by: Anton Vorontsov <avorontsov at ru.mvista.com>
---
 tapset/powerpc/registers.stp |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/tapset/powerpc/registers.stp b/tapset/powerpc/registers.stp
index 7f66d36..2403272 100644
--- a/tapset/powerpc/registers.stp
+++ b/tapset/powerpc/registers.stp
@@ -179,8 +179,8 @@ function ulong_arg:long (argnum:long) {
 
 function longlong_arg:long (argnum:long) {
 	if (probing_32bit_app()) {
-		lowbits = _stp_arg(argnum, 0, 1)
-		highbits = _stp_arg(argnum+1, 0, 1)
+		lowbits = _stp_arg(argnum * 2, 0, 1)
+		highbits = _stp_arg(argnum * 2 - 1, 0, 1)
 		return ((highbits << 32) | lowbits)
 	} else
 		return _stp_arg(argnum, 0, 0)
-- 
1.6.3.3