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Re: [PATCH 11/12] RISC-V: Linux ABI
- From: Florian Weimer <fweimer at redhat dot com>
- To: Palmer Dabbelt <palmer at dabbelt dot com>
- Cc: libc-alpha at sourceware dot org, Andrew Waterman <andrew at sifive dot com>, patches at groups dot riscv dot org, Darius Rad <darius at bluespec dot com>
- Date: Wed, 21 Jun 2017 10:56:12 +0200
- Subject: Re: [PATCH 11/12] RISC-V: Linux ABI
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On 06/20/2017 11:29 PM, Palmer Dabbelt wrote:
> On Wed, 14 Jun 2017 13:39:50 PDT (-0700), email@example.com wrote:
>> Palmer Dabbelt <firstname.lastname@example.org> writes:
>>> Linux-specific code that is required for maintaining ABI compatibility.
>>> This doesn't contain the actual system call interface, that is split out
>>> in order to avoid having a patch that's too big.
>> You likely need to override bits/sigstack.h in one of these patches
>> because the generic MINSIGSTKSZ and SIGSTKSZ values are likely too
>> small, especially if you want to add more or broader vector registers in
>> the future.
>> PTHREAD_STACK_MIN might warrant adjustment, too.
> We're going to pick the most common values, which I believe are
> MINSIGSTKSZ = 4KiB (alpha, powerpc, sparc, with aarch64 setting 5KiB)
You need to check what your architecture actually needs: the amount of
data pushed by the kernel, and it's also good to take into account the
save area used by the dynamic linker trampoline. Then maybe add a
couple of kilobytes so that there is room for some actually work
performed by the application signal handler.