From: cinap_lenrek@felloff.net
To: quanstro@labs.coraid.com
Cc: 9fans@9fans.net
Subject: [9fans] MOVLQSX wrong operand order
Date: Fri, 17 Jan 2014 21:07:45 +0100 [thread overview]
Message-ID: <16c90927387c0a9664e3f4c14e0736b3@felloff.net> (raw)
just disassembled some code generated by 6c
and found something funny. the debugger seems
to print the operands of MOVLQSX in the wrong
order.
output of 6c -S:
MOVLQSX BP,CX
ADDQ CX,AX
RET ,
output of acid:
foo+0x1a 0x00200042 MOVLQSX CX,BP
foo+0x1d 0x00200045 ADDQ CX,AX
foo+0x20 0x00200048 RET
fix:
diff -r 4e094627d459 sys/src/libmach/8db.c
--- a/sys/src/libmach/8db.c Tue Jan 14 00:22:13 2014 +0100
+++ b/sys/src/libmach/8db.c Fri Jan 17 21:06:42 2014 +0100
@@ -1223,7 +1223,7 @@
[0xfd] 0,0, "STD",
[0xfe] RMOPB,0, optabFE,
[0xff] RMOP,0, optabFF,
-[0x100] RM,0, "MOVLQSX %r,%e",
+[0x100] RM,0, "MOVLQSX %e,%r",
};
--
cinap
next reply other threads:[~2014-01-17 20:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-17 20:07 cinap_lenrek [this message]
2014-01-17 20:40 ` erik quanstrom
2014-01-17 21:07 ` Steven Stallion
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