From 4b9ace6d02eaf7eaef0451880686e095226292b9 Mon Sep 17 00:00:00 2001
From: Matheus <matheusuky@gmail.com>
Date: Wed, 17 Jun 2026 22:40:51 -0300
Subject: [PATCH] syscall: fix signal returns from syscall

---
 kernel-src/arch/x86-64/syscall.asm | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/kernel-src/arch/x86-64/syscall.asm b/kernel-src/arch/x86-64/syscall.asm
index 1813bcfc..30874526 100644
--- a/kernel-src/arch/x86-64/syscall.asm
+++ b/kernel-src/arch/x86-64/syscall.asm
@@ -306,6 +306,11 @@ arch_syscall_entry:
 	.return:
 	cli
 
+	; save the syscall return values into the saved context before
+	; signal delivery can rewrite it for a user handler
+	mov [rsp + 48], rax ; context->rax
+	mov [rsp + 72], rdx ; context->rdx
+
 	; call return logging function
 	mov rdi, rax
 	mov rsi, rdx
@@ -328,10 +333,10 @@ arch_syscall_entry:
 	mov es,rbx
 	pop rbx
 	mov ds,rbx
-	add rsp, 8 ; rax
+	pop rax
 	pop rbx
 	pop rcx
-	add rsp, 8 ; rdx
+	pop rdx
 	pop r8
 	pop r9
 	pop r10