From a07b234659e7c9ca13db8270f1048600bbe039bb Mon Sep 17 00:00:00 2001
From: Paulo Matos <pmatos@igalia.com>
Date: Wed, 30 Jul 2025 09:52:20 +0200
Subject: [PATCH] asm_tests: Tests for fninit

NFC.
These tests existed for 32bits but were missing for 64bits and reduced precision.
Adjust 32bit test to match new tests.
---
 unittests/32Bit_ASM/X87/DB_E3.asm | 12 ++++++++----
 unittests/ASM/X87/DB_E3.asm       | 21 +++++++++++++++++++++
 unittests/ASM/X87_F64/DB_E3.asm   | 22 ++++++++++++++++++++++
 3 files changed, 51 insertions(+), 4 deletions(-)
 create mode 100644 unittests/ASM/X87/DB_E3.asm
 create mode 100644 unittests/ASM/X87_F64/DB_E3.asm

diff --git a/unittests/32Bit_ASM/X87/DB_E3.asm b/unittests/32Bit_ASM/X87/DB_E3.asm
index e2f7c74e7..d38ab1ce9 100644
--- a/unittests/32Bit_ASM/X87/DB_E3.asm
+++ b/unittests/32Bit_ASM/X87/DB_E3.asm
@@ -7,12 +7,16 @@
 }
 %endif
 
-mov eax, 0
-mov esp, 0xe0000008
+section .bss
+control: resb 2 ; Reserve space for the FPU control word
+
+section .text
+global _start
+_start:
 fninit
 
 ; Ensures that fnstcw after fninit sets the correct value
-fnstcw [esp]
-mov ax, word [esp]
+fnstcw [rel control]
+mov ax, word [rel control]
 
 hlt
diff --git a/unittests/ASM/X87/DB_E3.asm b/unittests/ASM/X87/DB_E3.asm
new file mode 100644
index 000000000..17db1e88b
--- /dev/null
+++ b/unittests/ASM/X87/DB_E3.asm
@@ -0,0 +1,21 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RAX": "0x037F"
+  }
+}
+%endif
+
+section .bss
+control: resb 2 ; Reserve space for the FPU control word
+
+section .text
+global _start
+_start:
+fninit
+
+; Ensures that fnstcw after fninit sets the correct value
+fnstcw [rel control]
+mov ax, word [rel control]
+
+hlt
diff --git a/unittests/ASM/X87_F64/DB_E3.asm b/unittests/ASM/X87_F64/DB_E3.asm
new file mode 100644
index 000000000..39613ab6e
--- /dev/null
+++ b/unittests/ASM/X87_F64/DB_E3.asm
@@ -0,0 +1,22 @@
+%ifdef CONFIG
+{
+  "RegData": {
+    "RAX": "0x037F"
+  },
+  "Env": { "FEX_X87REDUCEDPRECISION" : "1" }
+}
+%endif
+
+section .bss
+control: resb 2 ; Reserve space for the FPU control word
+
+section .text
+global _start
+_start:
+fninit
+
+; Ensures that fnstcw after fninit sets the correct value
+fnstcw [rel control]
+mov ax, word [rel control]
+
+hlt