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* mips-tdep.c (mips_n32n64_return_value): Per N32/N64 ABI

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rules return composite types in registers as appropriate.
This commit is contained in:
Maciej W. Rozycki
2007-09-25 16:08:17 +00:00
parent 2d7b968704
commit b18bb924a2
2 changed files with 33 additions and 6 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2007-09-25 David Ung <davidu@mips.com>
Maciej W. Rozycki <macro@mips.com>
* mips-tdep.c (mips_n32n64_return_value): Per N32/N64 ABI
rules return composite types in registers as appropriate.
2007-09-24 Jim Blandy <jimb@codesourcery.com> 2007-09-24 Jim Blandy <jimb@codesourcery.com>
* symfile.h (struct symfile_segment_data): Doc fixes. * symfile.h (struct symfile_segment_data): Doc fixes.

33
gdb/mips-tdep.c
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@ -3076,9 +3076,30 @@ mips_n32n64_return_value (struct gdbarch *gdbarch,
gdb_byte *readbuf, const gdb_byte *writebuf) gdb_byte *readbuf, const gdb_byte *writebuf)
{ {
struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
if (TYPE_CODE (type) == TYPE_CODE_STRUCT
|| TYPE_CODE (type) == TYPE_CODE_UNION /* From MIPSpro N32 ABI Handbook, Document Number: 007-2816-004
|| TYPE_CODE (type) == TYPE_CODE_ARRAY
Function results are returned in $2 (and $3 if needed), or $f0 (and $f2
if needed), as appropriate for the type. Composite results (struct,
union, or array) are returned in $2/$f0 and $3/$f2 according to the
following rules:
* A struct with only one or two floating point fields is returned in $f0
(and $f2 if necessary). This is a generalization of the Fortran COMPLEX
case.
* Any other struct or union results of at most 128 bits are returned in
$2 (first 64 bits) and $3 (remainder, if necessary).
* Larger composite results are handled by converting the function to a
procedure with an implicit first parameter, which is a pointer to an area
reserved by the caller to receive the result. [The o32-bit ABI requires
that all composite results be handled by conversion to implicit first
parameters. The MIPS/SGI Fortran implementation has always made a
specific exception to return COMPLEX results in the floating point
registers.] */
if (TYPE_CODE (type) == TYPE_CODE_ARRAY
|| TYPE_LENGTH (type) > 2 * MIPS64_REGSIZE) || TYPE_LENGTH (type) > 2 * MIPS64_REGSIZE)
return RETURN_VALUE_STRUCT_CONVENTION; return RETURN_VALUE_STRUCT_CONVENTION;
else if (TYPE_CODE (type) == TYPE_CODE_FLT else if (TYPE_CODE (type) == TYPE_CODE_FLT
@ -3122,12 +3143,12 @@ mips_n32n64_return_value (struct gdbarch *gdbarch,
&& TYPE_NFIELDS (type) <= 2 && TYPE_NFIELDS (type) <= 2
&& TYPE_NFIELDS (type) >= 1 && TYPE_NFIELDS (type) >= 1
&& ((TYPE_NFIELDS (type) == 1 && ((TYPE_NFIELDS (type) == 1
&& (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) && (TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type, 0)))
== TYPE_CODE_FLT)) == TYPE_CODE_FLT))
|| (TYPE_NFIELDS (type) == 2 || (TYPE_NFIELDS (type) == 2
&& (TYPE_CODE (TYPE_FIELD_TYPE (type, 0)) && (TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type, 0)))
== TYPE_CODE_FLT) == TYPE_CODE_FLT)
&& (TYPE_CODE (TYPE_FIELD_TYPE (type, 1)) && (TYPE_CODE (check_typedef (TYPE_FIELD_TYPE (type, 1)))
== TYPE_CODE_FLT))) == TYPE_CODE_FLT)))
&& tdep->mips_fpu_type != MIPS_FPU_NONE) && tdep->mips_fpu_type != MIPS_FPU_NONE)
{ {