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* sparc-tdep.c (sparc_is_unimp_insn): New function.

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(sparc32_frame_cache): For functions where there is no debugging
        information to help us determine whether it's a struct-return
        function or not, fallback on checking whether the instruction
        at the return address is an "unimp" instruction or not.
This commit is contained in:
Joel Brobecker 2004-11-23 18:59:14 +00:00
parent dae1b34eab
commit 5465445a4b
2 changed files with 34 additions and 0 deletions
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8
gdb/ChangeLog
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@ -1,3 +1,11 @@
2004-11-23 Joel Brobecker <brobecker@gnat.com>
* sparc-tdep.c (sparc_is_unimp_insn): New function.
(sparc32_frame_cache): For functions where there is no debugging
information to help us determine whether it's a struct-return
function or not, fallback on checking whether the instruction
at the return address is an "unimp" instruction or not.
2004-11-22 John David Anglin <dave.anglin@nrc-cnrc.gc.ca>
* MAINTAINERS: Add myself to write after approval section.

26
gdb/sparc-tdep.c
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@ -106,6 +106,17 @@ sparc_fetch_instruction (CORE_ADDR pc)
}
/* Return non-zero if the instruction corresponding to PC is an "unimp"
instruction. */
static int
sparc_is_unimp_insn (CORE_ADDR pc)
{
const unsigned long insn = sparc_fetch_instruction (pc);
return ((insn & 0xc1c00000) == 0);
}
/* OpenBSD/sparc includes StackGhost, which according to the author's
website http://stackghost.cerias.purdue.edu "... transparently and
automatically protects applications' stack frames; more
@ -665,6 +676,21 @@ sparc32_frame_cache (struct frame_info *next_frame, void **this_cache)
cache->struct_return_p = 1;
}
}
else
{
/* There is no debugging information for this function to
help us determine whether this function returns a struct
or not. So we rely on another heuristic which is to check
the instruction at the return address and see if this is
an "unimp" instruction. If it is, then it is a struct-return
function. */
CORE_ADDR pc;
int regnum = cache->frameless_p ? SPARC_O7_REGNUM : SPARC_I7_REGNUM;
pc = frame_unwind_register_unsigned (next_frame, regnum) + 8;
if (sparc_is_unimp_insn (pc))
cache->struct_return_p = 1;
}
return cache;
}