52 lines
2.7 KiB
C
52 lines
2.7 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/runtime/valist.h"
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static void *__va_arg_mem(struct __va *ap, unsigned long sz, unsigned align) {
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void *r = ap->overflow_arg_area;
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if (align > 8) r = (void *)(((unsigned long)r + 15) / 16 * 16);
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ap->overflow_arg_area = (void *)(((unsigned long)r + sz + 7) / 8 * 8);
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return r;
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}
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void *__va_arg(struct __va *ap, unsigned long sz, unsigned align, unsigned k) {
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void *r;
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switch (k) {
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case 0:
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if (ap->gp_offset < 48) {
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r = (char *)ap->reg_save_area + ap->gp_offset;
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ap->gp_offset += 8;
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return r;
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} else {
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return __va_arg_mem(ap, sz, align);
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}
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case 1:
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if (ap->fp_offset < 112) {
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r = (char *)ap->reg_save_area + ap->fp_offset;
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ap->fp_offset += 8;
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return r;
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} else {
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return __va_arg_mem(ap, sz, align);
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}
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default:
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return __va_arg_mem(ap, sz, align);
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}
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}
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