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e765b44c38
This patch refactors the ppc64 function call and return value handling code in ppc-sysv-tdep.c. The main problem to be addressed by this refactoring is the code duplication caused by certain aggregate types: According to the ABI, some types are to be decomposed into component types for parameter and return value handling. For example, complex types are to be passed as if the real and imaginary component were separate arguments. Similarly, certain OpenCL vector types are passed as if they were multiple separate arguments of the vector element type. With the new ELFv2 ABI, there is another case: "homogeneous aggregates" (e.g. a struct containing 4 floats) are passed in multiple floating point registers as well. Unfortunately, the current code is not structured to easily model these ABI properties. For example, code to pass complex values re-implements code to pass the underlying (floating-point) type. This has already led to some unfortunate code duplication, and with the addition of ELFv2 ABI support, I would have had to add yet more such duplication. To avoid that, I've decided to refactor the code in order to re-use subroutines that handle the "base" types when handling those aggregate types. This was not intended to cause any difference on current (ELFv1) ABI code, but in fact it fixes a bug: FAIL: gdb.base/varargs.exp: print find_max_float_real(4, fc1, fc2, fc3, fc4) This was caused by the old code in ppc64_sysv_abi_push_float incorrectly handling floating-point arguments to vararg routines, which just happens to work out correctly automatically in the refactored code ... gdb/ChangeLog: * ppc-sysv-tdep.c (get_decimal_float_return_value): Update comment. (struct ppc64_sysv_argpos): New data structure. (ppc64_sysv_abi_push_float): Remove. (ppc64_sysv_abi_push_val): New function. (ppc64_sysv_abi_push_integer): Likewise. (ppc64_sysv_abi_push_freg): Likewise. (ppc64_sysv_abi_push_vreg): Likewise. (ppc64_sysv_abi_push_param): Likewise. (ppc64_sysv_abi_push_dummy_call): Refactor to use those new routines. (ppc64_sysv_abi_return_value_base): New function. (ppc64_sysv_abi_return_value): Refactor to use it. |
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| config | ||
| cpu | ||
| elfcpp | ||
| etc | ||
| gas | ||
| gdb | ||
| gold | ||
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| include | ||
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| ld | ||
| libdecnumber | ||
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| opcodes | ||
| readline | ||
| sim | ||
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| .cvsignore | ||
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| ChangeLog | ||
| compile | ||
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| configure | ||
| configure.ac | ||
| COPYING | ||
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| depcomp | ||
| djunpack.bat | ||
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| libtool.m4 | ||
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| MAINTAINERS | ||
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| missing | ||
| mkdep | ||
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| README | ||
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README for GNU development tools This directory contains various GNU compilers, assemblers, linkers, debuggers, etc., plus their support routines, definitions, and documentation. If you are receiving this as part of a GDB release, see the file gdb/README. If with a binutils release, see binutils/README; if with a libg++ release, see libg++/README, etc. That'll give you info about this package -- supported targets, how to use it, how to report bugs, etc. It is now possible to automatically configure and build a variety of tools with one command. To build all of the tools contained herein, run the ``configure'' script here, e.g.: ./configure make To install them (by default in /usr/local/bin, /usr/local/lib, etc), then do: make install (If the configure script can't determine your type of computer, give it the name as an argument, for instance ``./configure sun4''. You can use the script ``config.sub'' to test whether a name is recognized; if it is, config.sub translates it to a triplet specifying CPU, vendor, and OS.) If you have more than one compiler on your system, it is often best to explicitly set CC in the environment before running configure, and to also set CC when running make. For example (assuming sh/bash/ksh): CC=gcc ./configure make A similar example using csh: setenv CC gcc ./configure make Much of the code and documentation enclosed is copyright by the Free Software Foundation, Inc. See the file COPYING or COPYING.LIB in the various directories, for a description of the GNU General Public License terms under which you can copy the files. REPORTING BUGS: Again, see gdb/README, binutils/README, etc., for info on where and how to report problems.