Kernel: Save fpu state and flags in signal handler

This was causing some weird crashes :D
2025-06-27 21:51:13 +03:00
parent 9e895e5286
commit f73bb242f3
3 changed files with 15 additions and 4 deletions
--- a/kernel/arch/x86_64/Signal.S
+++ b/kernel/arch/x86_64/Signal.S
@@ -30,8 +30,14 @@ signal_trampoline:
 	movq %rsp, %rbp
 	andq $-16, %rsp

+	subq $512, %rsp
+	fxsave64 (%rsp)
+
 	call *%rax

+	fxrstor64 (%rsp)
+	addq $512, %rsp
+
 	// restore stack
 	movq %rbp, %rsp
 	popq %r15
@@ -51,6 +57,7 @@ signal_trampoline:
 	popq %rax

 	addq $16, %rsp
+	popfq

 	// return over red-zone
 	ret $128