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Questions tagged [semihosting]

11 questions
6
votes
1 answer

Where does STDOUT go with GDB, OopenOCD and semihosting?

I am trying to figure out semihostong on ARM (STM32042). I can see printf output if I run openocd directly from a command line and connect to it from gdb over TCP. But if I launch openocd from inside gdb, the output goes to some big /dev/null in the…
iter
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2 answers

What's the point of providing input and output operands if they are not specified in ASM template?

I found the following piece of code in u-boot/arch/arm/lib/semihosting.c that uses bkpt and other instructions and provides input and output operands even though they are not specified in the ASM template: static noinline long smh_trap(unsigned int…
user1042840
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2
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1 answer

OpenOCD exit on breakpoint

I'm developing an application on an STM32F042. I drive everything from a makefile, including my unit tests. I use OpenOCD and ST-LINK to flash the target. My unit tests run on the host and on the target. The host unit test driver returns 0 from…
iter
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1
vote
1 answer

QEMU semihosting doesn't produce output

I'm trying to set up a testing environment for my project using semihosting within QEMU. So far I had no issues with hello.c following this answer, however I'm having trouble getting it to work with CMake. Here's how I'm building the exact same…
psykana
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1
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1 answer

Capture QEMU Semihosted I/O

For unit testing purposes, I want to be able to run a bare-metal binary with qemu and capture it's output. Sample file: #include #include static void qemu_exit() { register uint32_t r0 __asm__("r0"); r0 = 0x18; register…
Edward Chamberlain
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0
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1 answer

Does semihosting work for qemu-system-aarch64?

I am using Rust to code in a [no_std] environment, targeting ARM's aarch64-unknown-none. When I enable -semihosting as stipulated in the qemu-system-aarch64 command options below, I never see any display on my host computer qemu or terminal. Is…
piosystems
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0
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1 answer

Can you programmatically remove breakpoints in ARM Cortex M3 application at runtime?

In my bare metal C application for a CM3, I have a startup script that runs a CRC on code and data sections in their target regions in memory. I noticed sometimes the check on code would fail, sometimes not, depending on if I had any breakpoints…
us3rnotfound
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0
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1 answer

QEMU Semihosting not working when building QEMU from Source

I'm emulating a Cortex-M33 using QEMU on a linux host. I've installed QEMU using sudo apt-get qemu-system-arm and semihosting is working fine (printf and file IO). I'm calling QEMU as follows: /usr/bin/qemu-system-arm -machine mps2-an505 -cpu…
cberk1
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0
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0 answers

How to let Python interact with the stdout/stdin of GDB console?

I am trying to make some automation testing with an embedded application running in an ARM Microcontroller. For the I/O exchange I have setup the Semihosting using arm-none-eabi-gdb as GDB client: arm-none-eabi-gdb my_binary.axf -ex "target…
luca zambuto
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0
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1 answer

Bare-metal ARM Cortex-A7 newlib crt0 not initializing .bss and .data regions

I'm learning to write bare-metal ARM Cortex-A7 firmware to run on QEMU with semihosting. I know that ARM GCC has a libc implementation called newlib, which supports semihosting for common libc functions. So I'm trying to get newlib to work as…
iNvEr7
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