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| author | Tom Hughes <tomhughes@chromium.org> | 2022-11-01 11:40:30 -0700 |
|---|---|---|
| committer | Chromeos LUCI <chromeos-scoped@luci-project-accounts.iam.gserviceaccount.com> | 2022-11-04 15:44:26 +0000 |
| commit | d05099c826aed67f4b132c44d8e18a2fc1e6c489 (patch) | |
| tree | 2298e9c5d718b8d6d17f372036415fa93532f247 | |
| parent | 62b71b15e13f41e5403c6d9abe216bf8c88af444 (diff) | |
| download | chrome-ec-d05099c826aed67f4b132c44d8e18a2fc1e6c489.tar.gz | |
libc/syscalls: Implement _write
All output goes to the UART. _write is used by printf(), so this allows
printf() to work correctly.
BRANCH=none
BUG=b:234181908, b:254530679
TEST=./test/run_device_tests.py --board dartmonkey -t libc_printf
Signed-off-by: Tom Hughes <tomhughes@chromium.org>
Change-Id: I60a5f283975c21dabac395f00b4738a6db083d29
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3997615
Reviewed-by: Bobby Casey <bobbycasey@google.com>
Code-Coverage: Zoss <zoss-cl-coverage@prod.google.com>
Reviewed-by: Andrea Grandi <agrandi@google.com>
| -rw-r--r-- | libc/syscalls.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/libc/syscalls.c b/libc/syscalls.c index 9c683a2732..43955a0ddd 100644 --- a/libc/syscalls.c +++ b/libc/syscalls.c @@ -14,6 +14,7 @@ #include "panic.h" #include "software_panic.h" #include "task.h" +#include "uart.h" /** * Reboot the system. @@ -27,3 +28,18 @@ void _exit(int rc) panic_printf("%s called with rc: %d\n", __func__, rc); software_panic(PANIC_SW_EXIT, task_get_current()); } + +/** + * Write to the UART. + * + * This function is called from libc functions such as printf(). + * + * @param fd ignored + * @param buf buffer to write + * @param len number of bytes in @buf to write + * @return number of bytes successfully written + */ +int _write(int fd, char *buf, int len) +{ + return uart_put(buf, len); +} |