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* sparc-tdep.c (sparc_gdbarch_init): Add comment explaining why

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ON_STACK is needed.
This commit is contained in:
Andrew Cagney 2002-04-26 23:37:33 +00:00
parent 2ceb85d0bd
commit 7e57f5f4a2
2 changed files with 49 additions and 0 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2002-04-26 Andrew Cagney <ac131313@redhat.com>
* sparc-tdep.c (sparc_gdbarch_init): Add comment explaining why
ON_STACK is needed.
2002-04-26 Ben Elliston <bje@redhat.com>
* target.c (do_xfer_memory): Correct reference to the new option

44
gdb/sparc-tdep.c
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@ -3026,6 +3026,50 @@ sparc_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_call_dummy_address (gdbarch, sparc_call_dummy_address);
set_gdbarch_call_dummy_breakpoint_offset (gdbarch, 0x30);
set_gdbarch_call_dummy_length (gdbarch, 0x38);
/* NOTE: cagney/2002-04-26: Based from info posted by Peter
Schauer around Oct '99. Briefly, due to aspects of the SPARC
ABI, it isn't possible to use ON_STACK with a strictly
compliant compiler.
Peter Schauer writes ...
No, any call from GDB to a user function returning a
struct/union will fail miserably. Try this:
*NOINDENT*
struct x
{
int a[4];
};
struct x gx;
struct x
sret ()
{
return gx;
}
main ()
{
int i;
for (i = 0; i < 4; i++)
gx.a[i] = i + 1;
gx = sret ();
}
*INDENT*
Set a breakpoint at the gx = sret () statement, run to it and
issue a `print sret()'. It will not succed with your
approach, and I doubt that continuing the program will work
as well.
For details of the ABI see the Sparc Architecture Manual. I
have Version 8 (Prentice Hall ISBN 0-13-825001-4) and the
calling conventions for functions returning aggregate values
are explained in Appendix D.3. */
set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
set_gdbarch_call_dummy_words (gdbarch, call_dummy_32);
#else