From 2dadbfc899df4179ca70c4ea04f74a5e190c2ae7 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Fri, 26 Sep 2025 13:17:41 -0400
Subject: fix usermode interrupts. add ability to define custom interrupt
 handlers

---
 arch/x86_64/syscall/syscall.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

(limited to 'arch/x86_64/syscall/syscall.c')

diff --git a/arch/x86_64/syscall/syscall.c b/arch/x86_64/syscall/syscall.c
index 7ddd179..1ed991d 100644
--- a/arch/x86_64/syscall/syscall.c
+++ b/arch/x86_64/syscall/syscall.c
@@ -35,18 +35,36 @@ __attribute__((naked))
 void _syscall_entry(void)
 {
     __asm__ volatile(" \
-            pushq %%r11; \
-            pushq %%rcx; \
             swapgs; \
             movq %%gs:%c[tcb], %%rax; \
             movq %%rsp, %c[sp](%%rax); \
             movq %c[ksp](%%rax), %%rsp; \
             pushq %c[sp](%%rax); \
+            pushq %%r11; \
+            pushq %%rcx; \
+            pushq %%rbx; \
+            pushq %%rbp; \
+            pushq %%r12; \
+            pushq %%r13; \
+            pushq %%r14; \
+            pushq %%r15; \
             callq _syscall_handler; \
             swapgs; \
-            popq %%rsp; \
+            popq %%r15; \
+            popq %%r14; \
+            popq %%r13; \
+            popq %%r12; \
+            popq %%rbp; \
+            popq %%rbx; \
+            xorq %%rdx, %%rdx; \
+            xorq %%rsi, %%rsi; \
+            xorq %%rdi, %%rdi; \
+            xorq %%r8, %%r8; \
+            xorq %%r9, %%r9; \
+            xorq %%r10, %%r10; \
             popq %%rcx; \
             popq %%r11; \
+            popq %%rsp; \
             sysretq;"
             ::
             [tcb] "i"(offsetof(processor_t, tcb)),
-- 
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