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Re: [Qemu-devel] [PATCH v3 2/2] semihosting: add --semihosting-config ar

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v3 2/2] semihosting: add --semihosting-config arg sub-argument
Date: Wed, 20 May 2015 16:11:10 +0100

On 20 May 2015 at 15:59, Liviu Ionescu <address@hidden> wrote:
>> On 20 May 2015, at 17:40, Peter Maydell <address@hidden> wrote:
>> ... The ARM semihosting API doesn't mandate any kind of quoting, and we
>> can't know what the guest application expects,
> ok (btw, my embedded semihosting code is happy with both quotes or 
> apostrophes)
>> so the user is going
>> to have to supply any necessary quotes.
> could you exemplify how the qemu syntax would look like for passing
> something functionally equivalent to the shell syntax
> [program --opt1 "path 1" --opt2 "path 2"]?

That depends entirely on how the guest program chooses to parse
its command line string. Semihosting doesn't have any mandated
quoting. So you just want to do something like


where commandline is the command line you want the app to
receive, with:
 * any escaping that the shell you ran QEMU via requires
 * the comma-escaping that QEMU's --arggroup,opt=value,opt=value
   syntax requires for values

In the example above, assuming a POSIX-shell style quoting
and that the guest splits its command line string honouring
 --semihosting-config,arg='program --opt1 "path 1" --opt2 "path 2"'

UHI's API apparently passes arguments individually to the
guest binary, so you would want to use multiple arg=.

-- PMM

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