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Merge "apps: Extract crt0 from C apps"

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GitOrigin-RevId: af8b6e41c39a9d5d0b85cb5f7b66d986e1bc3cf9
This commit is contained in:
June Tate-Gans
2022-08-30 17:33:53 +00:00
committed by Sam Leffler
parent 13799ab779
commit 6ee08d8b47
17 changed files with 408 additions and 200 deletions
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53
apps/c/libkata/printf.c Normal file
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// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <kata.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#ifdef CONFIG_PRINTING
// only prints 32-bit "%x" hex values
void _debug_printf(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
for (; *fmt; fmt++) {
if (*fmt == '%') {
fmt++;
if (*fmt == 'd') {
uint32_t arg = va_arg(args, uint32_t);
// TODO(sleffler): total hack
int printing = 0;
for (int d = 1000000000; d > 1; d /= 10) {
int n = (arg / d) % 10;
if (printing || n > 0) {
seL4_DebugPutChar('0' + n);
printing = 1;
}
}
seL4_DebugPutChar('0' + (arg % 10));
} else if (*fmt == 'x') {
uint32_t arg = va_arg(args, uint32_t);
for (int i = 7; i >= 0; i--) {
int n = (arg >> (4 * i)) & 0xF;
seL4_DebugPutChar(n > 9 ? 'A' + n - 10 : '0' + n);
}
}
} else {
seL4_DebugPutChar(*fmt);
}
}
va_end(args);
}
#endif // CONFIG_PRINTING