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lib: Make stdarg work for GCC on RISC-V64.

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* include/stdarg.h: GCC on RISC-V always passes arguments in registers.
Implementing these macros without the use of built-ins would be very
involved. So use those for now to make printf etc work.
This commit is contained in:
W. J. van der Laan 2021-04-04 11:24:36 +00:00 committed by Janneke Nieuwenhuizen
parent 9d7360cca6
commit c8dfa47e10
1 changed files with 14 additions and 1 deletions
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15
include/stdarg.h
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@ -1,6 +1,7 @@
/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
* Copyright © 2021 W. J. van der Laan <laanwj@protonmail.com>
*
* This file is part of GNU Mes.
*
@ -26,7 +27,19 @@
#define va_arg8(ap, type) va_arg(ap, type)
#else // ! SYSTEM_LIBC
#elif __GNUC__ && __riscv
// GCC on RISC-V always passes arguments in registers. Implementing
// these macros without the use of built-ins would be very involved.
typedef __builtin_va_list va_list;
#define va_start(v, l) __builtin_va_start (v, l)
#define va_end(v) __builtin_va_end (v)
#define va_arg(v, l) __builtin_va_arg (v, l)
#define va_arg8(ap, type) va_arg (ap, type)
#define va_copy(d, s) __builtin_va_copy (d, s)
#else // ! SYSTEM_LIBC && ! __riscv
#include <sys/types.h>