ulib Fix volatile

kernel/intr/intr0.S

@@ -66,7 +66,9 @@
   _push_regs
   cld
   movq %rsp, %rdi
+  sub $0x8, %rsp
   call intr_handleintr
+  add $0x8, %rsp
   _pop_regs
   add $0x10, %rsp
   iretq

kernel/proc/switch.S

@@ -2,10 +2,7 @@
 
 .global proc_switch
 proc_switch:
-  testq %rsi, %rsi
-  je 1f
   movq %rsi, %cr3
-1:
   mov %rdi, %rsp
   _pop_regs
   add $0x10, %rsp

kernel/spinlock/spinlock.c

@@ -6,8 +6,8 @@
 
 #define SPINLOCK_HINT() asm volatile("pause")
 
-struct {
-  uint64_t irq_flags;
+static struct {
+  volatile uint64_t irq_flags;
   atomic_int irq_nest;
 } IRQ_CTX = {0};
 

ulib/_premain.c

@@ -9,8 +9,8 @@
 #include <umalloc/umalloc.h>
 
 extern void main(void);
-extern uint8_t _bss_start[];
-extern uint8_t _bss_end[];
+extern volatile uint8_t _bss_start[];
+extern volatile uint8_t _bss_end[];
 
 void clearbss(void) {
   uint8_t *p = _bss_start;
@@ -20,7 +20,7 @@ void clearbss(void) {
 }
 
 #define MAX_ARGS 25
-static char *_args[MAX_ARGS];
+static volatile char *_args[MAX_ARGS];
 
 size_t _argslen;
 
@@ -40,7 +40,7 @@ void _premain(void) {
     _args[i] = umalloc(PROC_ARG_MAX);
   }
 
-  proc_argv(-1, &_argslen, _args, MAX_ARGS);
+  proc_argv(-1, &_argslen, (char **)_args, MAX_ARGS);
 
   main();
   proc_kill(proc_getpid());

ulib/_start.S

@@ -4,4 +4,9 @@
 
 .global _start
 _start:
+  xor %rbp, %rbp
+  mov %rsp, %rbp
+  and $-0x10, %rsp
+  sub $0x8, %rsp
+
   call _premain