First Hello world syscall

2026-01-03 02:04:09 +01:00
parent 1341dc00d9
commit e52268cd8e
26 changed files with 228 additions and 140 deletions
--- a/kernel/amd64/syscallentry.S
+++ b/kernel/amd64/syscallentry.S
@@ -0,0 +1,40 @@
+#include <amd64/regsasm.h>
+
+.extern amd64_syscall_dispatch
+
+dupa:
+jmp dupa
+
+.global amd64_syscall_entry
+amd64_syscall_entry:
+  cli
+  swapgs
+
+  movq %rsp, %gs:0
+  movq %gs:8, %rsp
+ 
+  pushq $0x23
+  pushq %gs:0
+  pushq %r11
+  pushq $0x1b
+  pushq %rcx
+  pushq $0
+  pushq $0
+  push_regs
+  cld
+  movq %rsp, %rdi
+  movq %rsp, %rbp
+  subq $8, %rsp
+  andq $~0xF, %rsp
+  callq amd64_syscall_dispatch
+  movq %rbp, %rsp
+  pop_regs
+  cli
+  addq $16, %rsp
+  popq %rcx
+  addq $8, %rsp
+  popq %r11
+  addq $16, %rsp
+  movq %gs:0, %rsp
+  swapgs
+  sysretq