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2007-11-07 Joseph Myers <joseph@codesourcery.com>

Browse source 
Daniel Jacobowitz  <dan@codesourcery.com>

	* ppc-sysv-tdep.c (ppc64_sysv_abi_push_dummy_call): Right-align
	struct values smaller than one doubleword; left-align those
	larger.  Pass structs containing a single floating-point value in
	registers.
This commit is contained in:
Joseph Myers 2007-11-08 00:10:06 +00:00
parent b14d30e141
commit 36815e57a6
2 changed files with 68 additions and 19 deletions
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8
gdb/ChangeLog
View file

@ -1,3 +1,11 @@
2007-11-07 Joseph Myers <joseph@codesourcery.com>
Daniel Jacobowitz <dan@codesourcery.com>
* ppc-sysv-tdep.c (ppc64_sysv_abi_push_dummy_call): Right-align
struct values smaller than one doubleword; left-align those
larger. Pass structs containing a single floating-point value in
registers.
2007-11-07 Joseph Myers <joseph@codesourcery.com>
Daniel Jacobowitz <dan@codesourcery.com>

79
gdb/ppc-sysv-tdep.c
View file

@ -977,22 +977,17 @@ ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
if (len > tdep->wordsize)
len = tdep->wordsize;
memset (regval, 0, sizeof regval);
/* WARNING: cagney/2003-09-21: As best I can
tell, the ABI specifies that the value should
be left aligned. Unfortunately, GCC doesn't
do this - it instead right aligns even sized
values and puts odd sized values on the
stack. Work around that by putting both a
left and right aligned value into the
register (hopefully no one notices :-^).
Arrrgh! */
/* Left aligned (8 byte values such as pointers
fill the buffer). */
memcpy (regval, val + byte, len);
/* Right aligned (but only if even). */
if (len == 1 || len == 2 || len == 4)
/* The ABI (version 1.9) specifies that values
smaller than one doubleword are right-aligned
and those larger are left-aligned. GCC
versions before 3.4 implemented this
incorrectly; see
<http://gcc.gnu.org/gcc-3.4/powerpc-abi.html>. */
if (byte == 0)
memcpy (regval + tdep->wordsize - len,
val + byte, len);
else
memcpy (regval, val + byte, len);
regcache_cooked_write (regcache, greg, regval);
}
greg++;
@ -1006,11 +1001,57 @@ ppc64_sysv_abi_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
value to memory. Fortunately, doing this
simplifies the code. */
write_memory (gparam, val, TYPE_LENGTH (type));
if (write_pass)
/* WARNING: cagney/2004-06-20: It appears that GCC
likes to put structures containing a single
floating-point member in an FP register instead of
general general purpose. */
if (freg <= 13
&& TYPE_CODE (type) == TYPE_CODE_STRUCT
&& TYPE_NFIELDS (type) == 1
&& TYPE_LENGTH (type) <= 16)
{
/* The ABI (version 1.9) specifies that structs
containing a single floating-point value, at any
level of nesting of single-member structs, are
passed in floating-point registers. */
while (TYPE_CODE (type) == TYPE_CODE_STRUCT
&& TYPE_NFIELDS (type) == 1)
type = check_typedef (TYPE_FIELD_TYPE (type, 0));
if (TYPE_CODE (type) == TYPE_CODE_FLT)
{
if (TYPE_LENGTH (type) <= 8)
{
if (write_pass)
{
gdb_byte regval[MAX_REGISTER_SIZE];
struct type *regtype
= register_type (gdbarch,
tdep->ppc_fp0_regnum);
convert_typed_floating (val, type, regval,
regtype);
regcache_cooked_write (regcache,
(tdep->ppc_fp0_regnum
+ freg),
regval);
}
freg++;
}
else if (TYPE_LENGTH (type) == 16
&& (gdbarch_long_double_format (current_gdbarch)
== floatformats_ibm_long_double))
{
if (write_pass)
{
regcache_cooked_write (regcache,
(tdep->ppc_fp0_regnum
+ freg),
val);
if (freg <= 12)
regcache_cooked_write (regcache,
(tdep->ppc_fp0_regnum
+ freg + 1),
val + 8);
}
freg += 2;
}
}
}
/* Always consume parameter stack space. */
gparam = align_up (gparam + TYPE_LENGTH (type), tdep->wordsize);
}