From 8de23ca36173cfdb3c609074496115ebd9045887 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Sat, 26 Sep 2026 22:07:16 -0400
Subject: x86_64: make syscall_entry compliant to SYSTEM-V ABI

---
 arch/x86_64/hal/smp.c     |  2 +-
 arch/x86_64/sys/syscall.c | 15 ++++-----------
 arch/x86_64/sys/syscall.h |  2 +-
 3 files changed, 6 insertions(+), 13 deletions(-)

(limited to 'arch/x86_64')

diff --git a/arch/x86_64/hal/smp.c b/arch/x86_64/hal/smp.c
index 473786d..f67ce0b 100644
--- a/arch/x86_64/hal/smp.c
+++ b/arch/x86_64/hal/smp.c
@@ -54,7 +54,7 @@ smp_init_bsp(void)
         obj_release(processor_objdir_obj);
     }
 
-    idt_init();
+    //idt_init();
     paging_pml4_init();
 }
 
diff --git a/arch/x86_64/sys/syscall.c b/arch/x86_64/sys/syscall.c
index a694674..7c5727f 100644
--- a/arch/x86_64/sys/syscall.c
+++ b/arch/x86_64/sys/syscall.c
@@ -26,35 +26,28 @@ _syscall_handle_arch(syscall_context_t *ctx)
 __attribute__((naked))
 void _syscall_entry(void)
 {
-    __asm__ volatile(" \
+    asm volatile(" \
                      swapgs; \
                      movq %%gs:%c[pcb], %%rax; \
                      movq %%rsp, %%rdx; \
                      movq %c[ksp](%%rax), %%rsp; \
-                     pushq %%rcx; \
                      pushq %%rdx; \
                      pushq %%r11; \
+                     pushq %%rcx; \
                      pushq %%rbp; \
                      callq syscall_handler; \
                      swapgs; \
-                     xorq %%r15, %%r15; \
-                     xorq %%r14, %%r14; \
-                     xorq %%r13, %%r13; \
-                     xorq %%r12, %%r12; \
                      xorq %%r10, %%r10; \
                      xorq %%r9, %%r9; \
                      xorq %%r8, %%r8; \
                      xorq %%rsi, %%rsi; \
                      xorq %%rdi, %%rdi; \
-                     xorq %%rbp, %%rbp; \
                      xorq %%rdx, %%rdx; \
-                     xorq %%rcx, %%rcx; \
-                     xorq %%rbx, %%rbx; \
                      popq %%rbp; \
+                     popq %%rcx; \
                      popq %%r11; \
                      popq %%rsp; \
-                     popq %%rcx; \
-                     sysretq;"
+                     sysretq"
                      ::
                      [pcb] "i"(offsetof(processor_t, pcb)),
                      [ksp] "i"(offsetof(pcb_t, ksp)));
diff --git a/arch/x86_64/sys/syscall.h b/arch/x86_64/sys/syscall.h
index 34f6a2a..32bf787 100644
--- a/arch/x86_64/sys/syscall.h
+++ b/arch/x86_64/sys/syscall.h
@@ -5,6 +5,6 @@
 
 int _syscall_handle_serial(syscall_context_t *ctx);
 
-#define SYSCALL_SERIAL_COM_WRITE 0
+#define SYSCALL_SERIAL_COM_WRITE 1
 
 #endif
-- 
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