77 lines
3.6 KiB
C
77 lines
3.6 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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│ 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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#define ShouldUseMsabiAttribute() 1
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#include "libc/dce.h"
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#include "libc/nt/files.h"
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#include "libc/nt/runtime.h"
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#include "libc/runtime/runtime.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/sysv/consts/nr.h"
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#define WasImported(SLOT) \
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((void *)*SLOT && *SLOT != (void *)&missingno /* see libc/crt/crt.S */)
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static privileged void __print$nt(const void *data, size_t len) {
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int64_t hand;
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uint32_t wrote;
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char xmm[256] forcealign(16);
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savexmm(&xmm[128]);
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hand = __imp_GetStdHandle(kNtStdErrorHandle);
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__imp_WriteFile(hand, data, len, &wrote, NULL);
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__imp_FlushFileBuffers(hand);
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loadxmm(&xmm[128]);
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}
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/**
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* Prints string, by any means necessary.
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*
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* This function offers a subset of write(STDERR_FILENO) functionality.
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* It's designed to work even when the runtime hasn't initialized, e.g.
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* before _init() gets called.
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*
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* @param len can be computed w/ tinystrlen()
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* @clob nothing except flags
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*/
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privileged void __print(const void *data, size_t len) {
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int64_t ax, ordinal;
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if (WasImported(__imp_WriteFile)) {
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__print$nt(data, len);
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} else {
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ordinal = __NR_write > 0 ? __NR_write : IsXnu() ? 0x2000004 : 4;
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asm volatile("syscall"
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: "=a"(ax)
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: "0"(ordinal), "D"(STDERR_FILENO), "S"(data), "d"(len)
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: "rcx", "r11", "memory", "cc");
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if (ax == -1 && !__hostos && !__NR_write) {
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asm volatile("syscall"
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: "=a"(ax)
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: "0"(ordinal), "D"(STDERR_FILENO), "S"(data), "d"(len)
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: "rcx", "r11", "memory", "cc");
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}
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}
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}
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privileged void __print_string(const char *s) {
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size_t n = 0;
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while (s[n]) ++n;
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__print(s, n);
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}
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