Fix gcc inline assembler operand constraints for syscall -- as pushl modifies %esp...

[pintos-anon] / src / lib / user / syscall.c

diff --git a/src/lib/user/syscall.c b/src/lib/user/syscall.c
index a9c5bc8500c517f58169a52c1dee5f1b78a3edff..c8385bc3364b1eabc57e68bae885fe458537b42a 100644 (file)
--- a/src/lib/user/syscall.c
+++ b/src/lib/user/syscall.c
@@ -38,8 +38,8 @@
              "pushl %[number]; int $0x30; addl $12, %%esp"      \
                : "=a" (retval)                                  \
                : [number] "i" (NUMBER),                         \
-                 [arg0] "g" (ARG0),                             \
-                 [arg1] "g" (ARG1)                              \
+                 [arg0] "r" (ARG0),                             \
+                 [arg1] "r" (ARG1)                              \
                : "memory");                                     \
           retval;                                               \
         })
@@ -54,9 +54,9 @@
              "pushl %[number]; int $0x30; addl $16, %%esp"      \
                : "=a" (retval)                                  \
                : [number] "i" (NUMBER),                         \
-                 [arg0] "g" (ARG0),                             \
-                 [arg1] "g" (ARG1),                             \
-                 [arg2] "g" (ARG2)                              \
+                 [arg0] "r" (ARG0),                             \
+                 [arg1] "r" (ARG1),                             \
+                 [arg2] "r" (ARG2)                              \
                : "memory");                                     \
           retval;                                               \
         })