I don't consider myself expert on this topic. But while _exploring_
something, I found these (MxCsr and FpCsr) are missing from
JUMP_BUFFER. Is this right? wine also don't have these. Wondering why?
Thought attached.
From cb1ff23556cbbdeb286f1fc26872d7b887044477 Mon Sep 17 00:00:00 2001
From: Biswapriyo Nath <nathbap...@gmail.com>
Date: Tue, 15 Jun 2021 21:30:25 +0530
Subject: [PATCH] crt: Add missing members in setjmp for x86_64.
---
mingw-w64-crt/misc/setjmp.S | 2 ++
mingw-w64-headers/crt/setjmp.h | 4 +++-
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/mingw-w64-crt/misc/setjmp.S b/mingw-w64-crt/misc/setjmp.S
index b2058e9..0c06b86 100644
--- a/mingw-w64-crt/misc/setjmp.S
+++ b/mingw-w64-crt/misc/setjmp.S
@@ -50,6 +50,8 @@ __MINGW_USYMBOL(__intrinsic_setjmpex):
movq %r15,0x48(%rcx) /* jmp_buf->R15 */
movq (%rsp),%rax
movq %rax,0x50(%rcx) /* jmp_buf->Rip */
+ stmxcsr 0x58(%rcx) /* jmp_buf->MxCsr */
+ fnstcw 0x5c(%rcx) /* jmp_buf->FpCsr */
movdqa %xmm6,0x60(%rcx) /* jmp_buf->Xmm6 */
movdqa %xmm7,0x70(%rcx) /* jmp_buf->Xmm7 */
movdqa %xmm8,0x80(%rcx) /* jmp_buf->Xmm8 */
diff --git a/mingw-w64-headers/crt/setjmp.h b/mingw-w64-headers/crt/setjmp.h
index eb772a3..4b69efa 100644
--- a/mingw-w64-headers/crt/setjmp.h
+++ b/mingw-w64-headers/crt/setjmp.h
@@ -128,7 +128,9 @@ extern "C" {
__MINGW_EXTENSION unsigned __int64 R14;
__MINGW_EXTENSION unsigned __int64 R15;
__MINGW_EXTENSION unsigned __int64 Rip;
- __MINGW_EXTENSION unsigned __int64 Spare;
+ unsigned long MxCsr;
+ unsigned short FpCsr;
+ unsigned short Spare;
SETJMP_FLOAT128 Xmm6;
SETJMP_FLOAT128 Xmm7;
SETJMP_FLOAT128 Xmm8;
--
2.32.0
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