Fix handling of Quad-type arguments. Previously, syscalls

containing 64-bit arguments would have explicit padding.
On 64-bit platforms there was no padding, so the dummy
argument was not covering anything. On 32-bit platforms
with weak alignment (i.e. i386) the 64-bit argument did
not need to be aligned, so there too an aditional argument
was introduced. On 32-bit platforms with strong alignment
(i.e. PowerPC) the dummy argument in fact cover the padding.
By elimininating the dummy argument, 64-bit platforms now
have 1 argument less. This also applies to 32-bit platforms
with weak alignment. On PowerPC this doesn't matter, because
the padding is still there. We just don't "name" it.
Deal with those 3 cases.

Approved by: re (kensmith)

1 files changed, 1 insertions, 1 deletions

diff --git a/usr.bin/truss/amd64-fbsd32.c b/usr.bin/truss/amd64-fbsd32.c
index 6abd99f..4f0eabb 100644
--- a/usr.bin/truss/amd64-fbsd32.c
+++ b/usr.bin/truss/amd64-fbsd32.c
@@ -167,7 +167,7 @@ i386_syscall_entry(struct trussinfo *trussinfo, int nargs) {
   iorequest.piod_op = PIOD_READ_D;
   iorequest.piod_offs = (void *)parm_offset;
   iorequest.piod_addr = fsc.args;
-  iorequest.piod_len = nargs * sizeof(unsigned long);
+  iorequest.piod_len = (1+nargs) * sizeof(unsigned long);
   ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
   if (iorequest.piod_len == 0)
     return;