openMSP430

Based on the TI documentation when a 'push' instruction is executed 1st thing that happens is R1(stack pointer) decremented by 2. The current (svn 100) openmsp430 is fetching the data from RAM //prior// R1 update.

e.g. the code: push 4(r1) push 4(r1)

should replicate last 2 elements from the stack.

gcc is generating such a code ... programs will fail to execute correctly.

iiahim

Hi Mihai,

Thanks a lot for the report. That was a tricky one :-P

I had a closer look and the bug occurs only when the push instruction is executed with the stack pointer (SR/R1) as an operand with an addressing mode which is either:

• indexed mode: PUSH x(R1)
• indirect register mode: PUSH @R1
• indirect autoincrement: PUSH @R1+

This bug will be fixed shortly.

Thanks again, Olivier

Fixed in SVN revision 102

It is to be noted that the POP instruction is not concerned by this bug.