From: Thomas Huth <thuth@redhat.com>
Date: Mon, 4 Nov 2024 16:35:04 +0000 (+0100)
Subject: hw/char/sifive_uart: Fix broken UART on big endian hosts
X-Git-Tag: v9.2.0-rc0~8^2~11
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=b069018e2fe1fc613f5eeecc810050210e845528;p=thirdparty%2Fqemu.git

hw/char/sifive_uart: Fix broken UART on big endian hosts

Casting a "uint32_t *" to a "uint8_t *" to get to the lowest 8-bit
part of the value does not work on big endian hosts. We've got to
take the proper detour through an 8-bit variable.

Fixes: 53c1557b23 ("hw/char: sifive_uart: Print uart characters async")
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20241104163504.305955-1-thuth@redhat.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---

diff --git a/hw/char/sifive_uart.c b/hw/char/sifive_uart.c
index aeb45d36018..5ae2a29ed68 100644
--- a/hw/char/sifive_uart.c
+++ b/hw/char/sifive_uart.c
@@ -174,10 +174,11 @@ sifive_uart_write(void *opaque, hwaddr addr,
 {
     SiFiveUARTState *s = opaque;
     uint32_t value = val64;
+    uint8_t ch = value;
 
     switch (addr) {
     case SIFIVE_UART_TXFIFO:
-        sifive_uart_write_tx_fifo(s, (uint8_t *) &value, 1);
+        sifive_uart_write_tx_fifo(s, &ch, 1);
         return;
     case SIFIVE_UART_IE:
         s->ie = val64;