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Set up a frame pointer on interrupt entry, to improve backtraces of
[pintos-anon]
/
src
/
userprog
/
process.c
diff --git
a/src/userprog/process.c
b/src/userprog/process.c
index 90ff18b14ddaae54563ee7d53d6c0cef538fe5aa..88c9d8dcae20995bb5e7dc3b4b2d5a42ca5b8e6e 100644
(file)
--- a/
src/userprog/process.c
+++ b/
src/userprog/process.c
@@
-54,6
+54,8
@@
execute_thread (void *filename_)
/* Initialize interrupt frame and load executable. */
memset (&if_, 0, sizeof if_);
/* Initialize interrupt frame and load executable. */
memset (&if_, 0, sizeof if_);
+ if_.gs = SEL_UDSEG;
+ if_.fs = SEL_UDSEG;
if_.es = SEL_UDSEG;
if_.ds = SEL_UDSEG;
if_.cs = SEL_UCSEG;
if_.es = SEL_UDSEG;
if_.ds = SEL_UDSEG;
if_.cs = SEL_UCSEG;
@@
-71,14
+73,11
@@
execute_thread (void *filename_)
/* Start the user process by simulating a return from an
interrupt, implemented by intr_exit (in
/* Start the user process by simulating a return from an
interrupt, implemented by intr_exit (in
- threads/intr-stubs.
pl
). Because intr_exit takes all of its
+ threads/intr-stubs.
S
). Because intr_exit takes all of its
arguments on the stack in the form of a `struct intr_frame',
we just point the stack pointer (%esp) to our stack frame
and jump to it. */
arguments on the stack in the form of a `struct intr_frame',
we just point the stack pointer (%esp) to our stack frame
and jump to it. */
- asm ("mov %0, %%esp\n"
- "jmp intr_exit\n"
- : /* no outputs */
- : "g" (&if_));
+ asm ("mov %%esp, %0; jmp intr_exit" :: "g" (&if_));
NOT_REACHED ();
}
NOT_REACHED ();
}