xnu-3789.70.16.tar.gz

[apple/xnu.git] / libsyscall / custom / custom.s

diff --git a/libsyscall/custom/custom.s b/libsyscall/custom/custom.s
index b9d46ba13ef13d60a6ea0726c08252e2694ec8e4..56a95cf5b9a2147ef7817b581037494087208728 100644 (file)
--- a/libsyscall/custom/custom.s
+++ b/libsyscall/custom/custom.s
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999-2007 Apple Inc. All rights reserved.
+ * Copyright (c) 1999-2015 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
@@ -32,19 +32,29 @@
 
 #if defined(__i386__)
 
-       .globl  _errno
-
-LABEL(cerror)
-       REG_TO_EXTERN(%eax, _errno)
-       mov             %esp,%edx
-       andl    $0xfffffff0,%esp
-       subl    $16,%esp
-       movl    %edx,4(%esp)
-       movl    %eax,(%esp)
-       CALL_EXTERN(_cthread_set_errno_self)
-       movl    4(%esp),%esp
-       movl    $-1,%eax
-       movl    $-1,%edx /* in case a 64-bit value is returned */
+/*
+ * i386 needs custom assembly to transform the return from syscalls
+ * into a proper stack for a function call out to cerror{,_nocancel}.
+ */
+
+LABEL(tramp_cerror)
+       mov             %esp, %edx
+       andl    $0xfffffff0, %esp
+       subl    $16, %esp
+       movl    %edx, 4(%esp)
+       movl    %eax, (%esp)
+       CALL_EXTERN(_cerror)
+       movl    4(%esp), %esp
+       ret
+
+LABEL(tramp_cerror_nocancel)
+       mov             %esp, %edx
+       andl    $0xfffffff0, %esp
+       subl    $16, %esp
+       movl    %edx, 4(%esp)
+       movl    %eax, (%esp)
+       CALL_EXTERN(_cerror_nocancel)
+       movl    4(%esp), %esp
        ret
 
 LABEL(__sysenter_trap)
@@ -52,39 +62,45 @@ LABEL(__sysenter_trap)
        movl %esp, %ecx
        sysenter
 
-#elif defined(__x86_64__)
+       .globl _i386_get_ldt
+       ALIGN
+_i386_get_ldt:
+       movl    $6,%eax
+       MACHDEP_SYSCALL_TRAP
+       jnb             2f
+       jmp             tramp_cerror
+2:     ret
 
-       .globl  _errno
-
-LABEL(cerror)
-       PICIFY(_errno) /* address -> %r11 */
-       movl    %eax,(%r11)
-       mov     %rsp,%rdx
-       andq    $-16,%rsp
-       subq    $16,%rsp
-       // Preserve the original stack
-       movq    %rdx,(%rsp)
-       movq    %rax,%rdi
-       CALL_EXTERN(_cthread_set_errno_self)
-       // Restore the original stack
-       movq    (%rsp),%rsp
-       movq    $-1,%rax
-       movq    $-1,%rdx /* in case a 128-bit value is returned */
-       ret
 
-#else
-#error Unsupported architecture
-#endif
+       .globl _i386_set_ldt
+       ALIGN
+_i386_set_ldt:
+       movl    $5,%eax
+       MACHDEP_SYSCALL_TRAP
+       jnb             2f
+       jmp             tramp_cerror
+2:     ret
+
+       ALIGN
+       .globl __thread_set_tsd_base
+__thread_set_tsd_base:
+       pushl   4(%esp)
+       pushl   $0
+       movl    $3,%eax
+       MACHDEP_SYSCALL_TRAP
+       addl    $8,%esp
+       ret
 
-#if defined(__i386__) || defined(__x86_64__)
+#elif defined(__x86_64__)
 
        .globl _i386_get_ldt
        ALIGN
 _i386_get_ldt:
        movl    $6,%eax
        MACHDEP_SYSCALL_TRAP
-       jnb     2f
-       jmp     cerror
+       jnb             2f
+       movq    %rax, %rdi
+       jmp             _cerror
 2:     ret
 
 
@@ -93,8 +109,21 @@ _i386_get_ldt:
 _i386_set_ldt:
        movl    $5,%eax
        MACHDEP_SYSCALL_TRAP
-       jnb     2f
-       jmp     cerror
+       jnb             2f
+       movq    %rax, %rdi
+       jmp             _cerror
 2:     ret
 
+       ALIGN
+       .globl __thread_set_tsd_base
+__thread_set_tsd_base:
+       movl    $0, %esi        // 0 as the second argument
+       movl    $ SYSCALL_CONSTRUCT_MDEP(3), %eax       // Machine-dependent syscall number 3
+       MACHDEP_SYSCALL_TRAP
+       ret
+
+#else
+#error unknown architecture
 #endif
+
+.subsections_via_symbols