From: Niels Möller <nisse@lysator.liu.se>
Date: Sun, 20 Nov 2011 21:36:20 +0000 (+0100)
Subject: Added some notes on the w64 ABI.
X-Git-Tag: converted-master-branch-to-git~36
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7c0362fa8fd0b3dbf9c5df87f192572be5358665;p=thirdparty%2Fnettle.git

Added some notes on the w64 ABI.

Rev: nettle/x86_64/README:1.3
---

diff --git a/x86_64/README b/x86_64/README
index 11c2be15..8506b719 100644
--- a/x86_64/README
+++ b/x86_64/README
@@ -23,3 +23,31 @@ Registers	May be		Argument
 %r13		
 %r14		
 %r15		
+
+w64 ABI, according to
+http://msdn.microsoft.com/en-us/library/9z1stfyw.aspx:
+
+Registers	May be		Argument
+		clobbered	number
+
+%rax 		Y
+%rbx		
+%rcx		Y		1
+%rdx		Y		2
+%rbp		
+%rsi
+%rdi
+%rsp		(SP)
+%r8		Y		3
+%r9		Y		4
+%r10		Y
+%r11		Y
+%r12		
+%r13		
+%r14		
+%r15		
+
+Additional arguments are passed on the stack. "backing store" on the
+stack for the four register arguments is also required. %xmm6 and
+%xmm7 are callee-saved. The "long" type is just 32 bits. Nettle
+currently does *NOT* support this ABI.