51 lines
2.6 KiB
C
51 lines
2.6 KiB
C
/*-*- 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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#include "libc/runtime/valist.h"
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static void *__va_arg_mem(struct __va_list *ap, size_t sz, size_t align) {
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void *r = (void *)ROUNDUP((intptr_t)ap->overflow_arg_area, align);
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ap->overflow_arg_area = (void *)ROUNDUP((intptr_t)r + sz, 8);
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return r;
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}
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void *__va_arg(struct __va_list *ap, size_t 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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