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tests/qtest/boot-serial-test: Reduce for() loop in PL011 tests

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Since registers are not modified, we don't need
to refill their values. Directly jump to the previous
store instruction to keep filling the TXDAT register.

The equivalent C code remains:

  while (true) {
      *UART_DATA = 'T';
  }

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2025-01-13 12:35:33 +00:00 • committed by Peter Maydell
parent 16e8c947bd
commit afd757e461
1 changed files with 6 additions and 6 deletions
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12
tests/qtest/boot-serial-test.c
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@ -70,18 +70,18 @@ static const uint8_t kernel_plml605[] = {
};
static const uint8_t bios_raspi2[] = {
0x08, 0x30, 0x9f, 0xe5, /* loop: ldr r3, [pc, #8] Get &UART0 */
0x08, 0x30, 0x9f, 0xe5, /* ldr r3, [pc, #8] Get &UART0 */
0x54, 0x20, 0xa0, 0xe3, /* mov r2, #'T' */
0x00, 0x20, 0xc3, 0xe5, /* strb r2, [r3] *TXDAT = 'T' */
0xfb, 0xff, 0xff, 0xea, /* b -12 (loop) */
0x00, 0x20, 0xc3, 0xe5, /* loop: strb r2, [r3] *TXDAT = 'T' */
0xff, 0xff, 0xff, 0xea, /* b -4 (loop) */
0x00, 0x10, 0x20, 0x3f, /* UART0: 0x3f201000 */
};
static const uint8_t kernel_aarch64[] = {
0x81, 0x0a, 0x80, 0x52, /* loop: mov w1, #'T' */
0x81, 0x0a, 0x80, 0x52, /* mov w1, #'T' */
0x02, 0x20, 0xa1, 0xd2, /* mov x2, #0x9000000 Load UART0 */
0x41, 0x00, 0x00, 0x39, /* strb w1, [x2] *TXDAT = 'T' */
0xfd, 0xff, 0xff, 0x17, /* b -12 (loop) */
0x41, 0x00, 0x00, 0x39, /* loop: strb w1, [x2] *TXDAT = 'T' */
0xff, 0xff, 0xff, 0x17, /* b -4 (loop) */
};
static const uint8_t kernel_nrf51[] = {