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Re: [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0

From: Alex Bennée
Subject: Re: [PATCH 0/8] Add RISC-V semihosting 0.2. Finish ARM semihosting 2.0
Date: Mon, 14 Dec 2020 14:58:12 +0000
User-agent: mu4e 1.5.7; emacs 28.0.50

Alex Bennée <alex.bennee@linaro.org> writes:

> Keith Packard <keithp@keithp.com> writes:
>> This series adds support for RISC-V Semihosting, version 0.2 as
>> specified here:
>>      https://github.com/riscv/riscv-semihosting-spec/releases/tag/0.2
>> This specification references the ARM semihosting release 2.0 as specified 
>> here:
>>      https://static.docs.arm.com/100863/0200/semihosting.pdf
>> That specification includes several semihosting calls which were not
>> previously implemented. This series includes implementations for the
>> remaining calls so that both RISC-V and ARM versions are now complete.
>> Tests for release 2.0 can be found in picolibc on the semihost-2.0-all
>> branch:
>>      https://github.com/picolibc/picolibc/tree/semihost-2.0-all
>> These tests uncovered a bug in the SYS_HEAPINFO implementation for
>> ARM, which has been fixed in this series as well.
>> The series is structured as follows:
>>  1. Move shared semihosting files
>>  2. Change public common semihosting APIs
>>  3. Change internal semihosting interfaces
>>  4. Fix SYS_HEAPINFO crash on ARM
>>  5. Add RISC-V semihosting implementation
>>  6-8. Add missing semihosting operations from release 2.0
>> Signed-off-by: Keith Packard <keithp@keithp.com>
> Queued to semihosting/next, thanks.

Hmm scratch that... it fails in a number of linux-user only builds with:

libqemu-aarch64_be-linux-user.fa.p/linux-user_aarch64_cpu_loop.c.o: in function 
  /builds/stsquad/qemu/build/../linux-user/aarch64/cpu_loop.c:133: undefined 
reference to `do_common_semihosting'
  collect2: error: ld returned 1 exit status
  [651/2871] Compiling C object 
  ninja: build stopped: subcommand failed.

As well as a chunk of the various cross builds, see:


On the next re-spin could you include Kito Cheng's patch for linux-user
support and also drop the version numbering from the commit titles so I
don't have to file them off again.


Alex Bennée

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