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Update start_process to pad process stack before pushing argv elements for performance

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Themis Demetriades
2024-11-04 00:19:36 +00:00
parent 62d2cb54e5
commit 6f9c911ebe
1 changed files with 4 additions and 0 deletions
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4
src/userprog/process.c
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@@ -118,6 +118,10 @@ start_process (void *file_name_)
/* TODO: Allocate an extra page for the rest of the process stack. */ /* TODO: Allocate an extra page for the rest of the process stack. */
} }
/* Align stack pointer to word size before pushing argv elements for
performance. */
if_.esp -= align_size * sizeof (uint8_t);
/* Push pointers to process arguments from argument linked list */ /* Push pointers to process arguments from argument linked list */
struct list_elem *e = list_begin (&arg_list); struct list_elem *e = list_begin (&arg_list);
struct list_elem *tail = list_tail (&arg_list); struct list_elem *tail = list_tail (&arg_list);