From 48a5e34fcd07852b4a68825ce8e37feb6f6d04d7 Mon Sep 17 00:00:00 2001
From: Mole Shang <135e2@135e2.dev>
Date: Sun, 11 Feb 2024 14:41:35 +0800
Subject: lab traps: finish

---
 kernel/sysproc.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

(limited to 'kernel/sysproc.c')

diff --git a/kernel/sysproc.c b/kernel/sysproc.c
index bd9d0f0..fac1d83 100644
--- a/kernel/sysproc.c
+++ b/kernel/sysproc.c
@@ -65,6 +65,9 @@ sys_sleep(void)
     }
     sleep(&ticks, &tickslock);
   }
+
+  backtrace();
+
   release(&tickslock);
   return 0;
 }
@@ -124,3 +127,26 @@ sys_sysinfo(void)
   return sys_info(si);
 }
 
+uint64
+sys_sigalarm(void)
+{
+  struct proc *p = myproc();
+  uint64 handler;
+
+  argint(0, &p->alarm_interval);
+  argaddr(1, &handler);
+  p->alarm_handler = handler;
+
+  return 0;
+}
+
+uint64 sys_sigreturn(void)
+{
+  struct proc *p = myproc();
+  // retore saved trapframe to resume
+  memmove(p->trapframe, p->atpfm, sizeof(struct trapframe));
+  p->alarm_tickspassed = 0;
+  p->alarm_caninvoke = 1;
+  // make sure return the original a0 in trapframe to pass test3
+  return p->trapframe->a0;
+}
-- 
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