glibc/sysdeps/riscv/riscv-ifunc.h

/* Common definition for ifunc resolvers.  Linux/RISC-V version.
   This file is part of the GNU C Library.
   Copyright (C) 2024 Free Software Foundation, Inc.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <sysdep.h>
#include <ifunc-init.h>
#include <sys/hwprobe.h>

#define INIT_ARCH()

#define riscv_libc_ifunc(name, expr)				\
  __ifunc_args (name, name, expr(hwcap, hwprobe), INIT_ARCH,	\
                uint64_t hwcap, __riscv_hwprobe_t hwprobe)
riscv: Enable multi-arg ifunc resolvers RISC-V is apparently the first architecture to pass more than one argument to ifunc resolvers. The helper macros in libc-symbols.h, __ifunc_resolver(), __ifunc(), and __ifunc_hidden(), are incompatible with this. These macros have an "arg" (non-final) parameter that represents the parameter signature of the ifunc resolver. The result is an inability to pass the required comma through in a single preprocessor argument. Rearrange the __ifunc_resolver() macro to be variadic, and pass the types as those variable parameters. Move the guts of __ifunc() and __ifunc_hidden() into new macros, __ifunc_args(), and __ifunc_args_hidden(), that pass the variable arguments down through to __ifunc_resolver(). Then redefine __ifunc() and __ifunc_hidden(), which are used in a bunch of places, to simply shuffle the arguments down into __ifunc_args[_hidden]. Finally, define a riscv-ifunc.h header, which provides convenience macros to those looking to write ifunc selectors that use both arguments. Signed-off-by: Evan Green <evan@rivosinc.com> Reviewed-by: Florian Weimer <fweimer@redhat.com> Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> 2024-02-27 22:56:41 +00:00			`/* Common definition for ifunc resolvers. Linux/RISC-V version.`
			`This file is part of the GNU C Library.`
			`Copyright (C) 2024 Free Software Foundation, Inc.`

			`The GNU C Library is free software; you can redistribute it and/or`
			`modify it under the terms of the GNU Lesser General Public`
			`License as published by the Free Software Foundation; either`
			`version 2.1 of the License, or (at your option) any later version.`

			`The GNU C Library is distributed in the hope that it will be useful,`
			`but WITHOUT ANY WARRANTY; without even the implied warranty of`
			`MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU`
			`Lesser General Public License for more details.`

			`You should have received a copy of the GNU Lesser General Public`
			`License along with the GNU C Library; if not, see`
			`<https://www.gnu.org/licenses/>. */`

			`#include <sysdep.h>`
			`#include <ifunc-init.h>`
			`#include <sys/hwprobe.h>`

			`#define INIT_ARCH()`

			`#define riscv_libc_ifunc(name, expr) \`
			`__ifunc_args (name, name, expr(hwcap, hwprobe), INIT_ARCH, \`
			`uint64_t hwcap, __riscv_hwprobe_t hwprobe)`