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| author | Christian Krinitsin <mail@krinitsin.com> | 2025-07-03 07:27:52 +0000 |
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| committer | Christian Krinitsin <mail@krinitsin.com> | 2025-07-03 07:27:52 +0000 |
| commit | d0c85e36e4de67af628d54e9ab577cc3fad7796a (patch) | |
| tree | f8f784b0f04343b90516a338d6df81df3a85dfa2 /results/classifier/gemma3:12b/peripherals/2462 | |
| parent | 7f4364274750eb8cb39a3e7493132fca1c01232e (diff) | |
| download | qemu-analysis-d0c85e36e4de67af628d54e9ab577cc3fad7796a.tar.gz qemu-analysis-d0c85e36e4de67af628d54e9ab577cc3fad7796a.zip | |
add deepseek and gemma results
Diffstat (limited to 'results/classifier/gemma3:12b/peripherals/2462')
| -rw-r--r-- | results/classifier/gemma3:12b/peripherals/2462 | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/results/classifier/gemma3:12b/peripherals/2462 b/results/classifier/gemma3:12b/peripherals/2462 new file mode 100644 index 000000000..69d791d3b --- /dev/null +++ b/results/classifier/gemma3:12b/peripherals/2462 @@ -0,0 +1,40 @@ + +QEMU SIFIVE reading from stdin hangs +Description of problem: +I have a simple test program (C and ASM) that reads from stdin. When i was using the qemu provided by Ubuntu, QEMU emulator version 8.0.4 (Debian 1:8.0.4+dfsg-1ubuntu3.23.10.5), my test was working, and was able to read bytes from stdin. + +Using the latest Qemu from git, breaks my test. I can still print, but now reading hangs, like its always waiting for input but never getting it. + +My guess is that this commit breaks my code: +https://github.com/qemu/qemu/commit/6ee7ba1b8a10bd8eb1d3b918eaaf9f832a51adb4 + +Before the above commit, `qemu_chr_fe_set_handlers` was being called, and that is what allowed the default behavior of reading from stdin is on by default? + +from sifive_uart.c +``` + qemu_chr_fe_set_handlers(&s->chr, sifive_uart_can_rx, sifive_uart_rx, + sifive_uart_event, sifive_uart_be_change, s, + NULL, true); +``` +Steps to reproduce: +1. compile simple C program that calls `read` reading a single byte from stdin +2. do not initialize UART options +3. run in QEMU, send input, hangs. +Additional information: +Other examples online, like riscv-probe, use a uart init function like below: +``` +static void sifive_uart_init() +{ + uart = (int *)(void *)getauxval(SIFIVE_UART0_CTRL_ADDR); + uint32_t uart_freq = getauxval(UART0_CLOCK_FREQ); + uint32_t baud_rate = getauxval(UART0_BAUD_RATE); + uint32_t divisor = uart_freq / baud_rate - 1; + uart[UART_REG_DIV] = divisor; + uart[UART_REG_TXCTRL] = UART_TXEN; + uart[UART_REG_RXCTRL] = UART_RXEN; + uart[UART_REG_IE] = 0; +} +``` + +However, when I was using QEMU 8.0.4, i did not have to write a function like above to init UART, because stdin and stdout were working out of the box. +Below is my C and ASM: |