upload android base code part3

android/bionic/libc/arch-x86/syscalls/sigaltstack.S

@@ -0,0 +1,34 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(sigaltstack)
+    pushl   %ebx
+    .cfi_def_cfa_offset 8
+    .cfi_rel_offset ebx, 0
+    pushl   %ecx
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset ecx, 0
+
+    call    __kernel_syscall
+    pushl   %eax
+    .cfi_adjust_cfa_offset 4
+    .cfi_rel_offset eax, 0
+
+    mov     16(%esp), %ebx
+    mov     20(%esp), %ecx
+    movl    $__NR_sigaltstack, %eax
+    call    *(%esp)
+    addl    $4, %esp
+
+    cmpl    $-MAX_ERRNO, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno_internal
+    addl    $4, %esp
+1:
+    popl    %ecx
+    popl    %ebx
+    ret
+END(sigaltstack)