bugProgramming from the Ground Up Book - Bugs: bug #48806, booksize 1.0, ch. 9, p. 149: Wrong...

 
 

bug #48806: booksize 1.0, ch. 9, p. 149: Wrong instruction order for pushl equivalence

Submitter:  None
Submitted:  Wed 17 Aug 2016 11:34:59 AM UTC
 
Category:  None Severity:  3 - Normal
Item Group:  None Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open
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Wed 17 Aug 2016 11:34:59 AM UTC, original submission:  

Currently, the book says:

pushl %eax
is equivalent to
movl %eax, (%esp)
subl $4, %esp

However, this would overwrite any given information currently sitting in (%esp). The correct order is
subl $4, %esp     # First make room for new data
movl %eax, (%esp) # Then store content of eax register in there

Thank you for this great book, it is easy to read, yet full of great information.

Anonymous

 

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