Re: Need "_fpx_sw_bytes", "FP_XSTATE_MAGIC2_SIZE" and "FP_XSTATE_MAGIC{1,2}" definition to compile CoreCLR

[Rich Felker <dalias@libc.org>]

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On Thu, Aug 04, 2016 at 09:15:40PM +0000, Dangling Pointer wrote:
> Please provide the user-facing definitions of "struct _fpx_sw_bytes" and macros "FP_XSTATE_MAGIC2_SIZE", "FP_XSTATE_MAGIC1" and "FP_XSTATE_MAGIC2" to compile CoreCLR.
> 
> 
> Related issue: https://github.com/dotnet/coreclr/issues/917#issuecomment-236907708
> 
> Usage:  https://github.com/dotnet/coreclr/blob/9585fc2/src/pal/src/include/pal/context.h#L142-L178

Would a patch like the attached me sufficient? Does 32-bit x86 need
something like this too?

Rich

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diff --git a/arch/x86_64/bits/signal.h b/arch/x86_64/bits/signal.h
index e3c3141..5393649 100644
--- a/arch/x86_64/bits/signal.h
+++ b/arch/x86_64/bits/signal.h
@@ -33,6 +33,14 @@
 #endif
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define FP_XSTATE_MAGIC1 0x46505853U
+#define FP_XSTATE_MAGIC2 0x46505845U
+#define FP_XSTATE_MAGIC2_SIZE 4UL
+struct _fpx_sw_bytes {
+	unsigned magic1, extended_size;
+	unsigned long xstate_bv;
+	unsigned xstate_size, padding[7];
+};
 typedef long long greg_t, gregset_t[23];
 typedef struct _fpstate {
 	unsigned short cwd, swd, ftw, fop;