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Date: Wed, 15 Apr 2020 11:55:12 -0700
From: Fangrui Song <>
Subject: Re: Hexagon DSP support

On 2020-04-15, wrote:
>Recently work has been done with clang/llvm/lld to extend support for
>Qualcomm's Hexagon DSP to a Linux target.  At this point the publicly
>available LLVM tools are able to build and run Hexagon programs via QEMU.
>I've attached a patch that add the Hexagon bits to musl.  The optimized
>routines have been purposely omitted to keep the size and complexity to a
>The changes are being mirrored here:
>The QEMU mirror is here:
>A description of the assembly language is here:
>The objective is to have enough freely available tools and libraries that
>any user could develop code for the DSP.  The C-library is an important part
>of that stack and this patch is intended to start a discussion of what would
>need to happen in order for Hexagon to be added to the musl sources.
>I've tested this using libc-test (git:// and 56 errors
>are reported.  The support for Hexagon in QEMU is on-going and while some of
>the errors (math) may be attributed to QEMU most also happen on hardware.  A
>good chunk fail due to floating point exception status or precision.
>Beyond the above testing a large number of packages have been built using
>buildroot with our internal llvm tools.  No issues outside of tweaks to
>avoid glibc assumptions were seen.


Any chance to move the psABI
as mentioned by to a more discoverable/official place :) ?

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