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(output_function_epilogue): If the last insn in the current function is a (volatile) call... 

(output_function_epilogue): If the last insn in the
current function is a (volatile) call, then emit an extra
nop after the call so that RP will point to a valid instruction.

From-SVN: r4630
This commit is contained in:
Richard Stallman 1993-06-04 06:52:49 +00:00
parent 71cdef7e2e
commit 08a2b1188a
1 changed files with 24 additions and 2 deletions
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26
gcc/config/pa/pa.c
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@ -2155,14 +2155,36 @@ output_function_epilogue (file, size)
FILE *file;
int size;
{
rtx insn = get_last_insn ();
/* hppa_expand_epilogue does the dirty work now. We just need
to output the assembler directives which denote the end
of a function. */
of a function.
To make debuggers happy, emit a nop if the epilogue was completely
eliminated due to a volatile call as the last insn in the
current function. That way the return address (in %r2) will
always point to a valid instruction in the current function. */
/* Get the last real insn. */
if (GET_CODE (insn) == NOTE)
insn = prev_real_insn (insn);
/* If it is a sequence, then look inside. */
if (insn && GET_CODE (insn) == INSN && GET_CODE (PATTERN (insn)) == SEQUENCE)
insn = XVECEXP (PATTERN (insn), 0, 0);
/* If insn is a CALL_INSN, then it must be a call to a volatile
function (otherwise there would be epilogue insns). */
if (insn && GET_CODE (insn) == CALL_INSN)
fprintf (file, "\tnop\n");
fprintf (file, "\t.EXIT\n\t.PROCEND\n");
}
void
hppa_expand_epilogue()
hppa_expand_epilogue ()
{
rtx tmpreg;
int offset,i;