From 912d2e3c7eb1baa71dda2c0a28aa5809eaa96f27 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Sat, 16 Jul 2022 13:33:00 +0200
Subject: amd64: barely boot into kernel code

---
 src/user/lib/syscall.s | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

(limited to 'src/user')

diff --git a/src/user/lib/syscall.s b/src/user/lib/syscall.s
index 0af49f3..0f9e444 100644
--- a/src/user/lib/syscall.s
+++ b/src/user/lib/syscall.s
@@ -2,23 +2,24 @@
 .global _syscall
 .type _syscall, @function
 _syscall:
-	push %ebx // preserve registers
-	push %esi
-	push %edi
-	push %ebp
+	push %rbx // preserve registers
+	push %rsi
+	push %rdi
+	push %rbp
 
-	mov 20(%esp), %eax
-	mov 24(%esp), %ebx
-	mov %esp, %ecx
-	mov $_syscall_ret, %edx
-	mov 28(%esp), %esi
-	mov 32(%esp), %edi
-	mov 36(%esp), %ebp
+	// NOT the calling convention TODO you lazy fuck
+	mov 20(%rsp), %rax
+	mov 24(%rsp), %rbx
+	mov %rsp, %rcx
+	mov $_syscall_ret, %rdx
+	mov 28(%rsp), %rsi
+	mov 32(%rsp), %rdi
+	mov 36(%rsp), %rbp
 	sysenter
 
 _syscall_ret:
-	pop %ebp
-	pop %edi
-	pop %esi
-	pop %ebx
+	pop %rbp
+	pop %rdi
+	pop %rsi
+	pop %rbx
 	ret
-- 
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