commit feaa89a1bcc643a9c3892bb56e020e00779bbb3a
author Serban Constantinescu <serban.constantinescu@arm.com> Mon Oct 07 16:49:09 2013 +0100
committer Elliott Hughes <enh@google.com> Mon Oct 28 16:16:34 2013 -0700
tree 6dcf3924797a62d3dbcf258ccf67ebc26aa0d268
parent 07d3c6cecc8016577c9dbd827e85154c077604da

AArch64: Add support for AArch64 to the syscall interface

This patch adds support for AArch64 to the syscall interface. The kernel
implementation exports a set of canonical syscalls, therefore some of
the userspace exported syscalls are implemented as stubs based on the
canonical set.

Change-Id: Ia965d71e97769b8be9d7655193fc40303964c4df
Signed-off-by: Serban Constantinescu <serban.constantinescu@arm.com>

libc/tools/gensyscalls.py

diff --git a/libc/tools/gensyscalls.py b/libc/tools/gensyscalls.py
index 5595cd7..bf44b70 100755
--- a/libc/tools/gensyscalls.py
+++ b/libc/tools/gensyscalls.py
@@ -56,6 +56,29 @@
 
 
 #
+# AArch64 assembler templates for each syscall stub
+#
+
+aarch64_call = syscall_stub_header + """\
+    stp     x29, x30, [sp, #-16]!
+    mov     x29,  sp
+    str     x8,       [sp, #-16]!
+
+    mov     x8, %(__NR_name)s
+    svc     #0
+
+    ldr     x8,       [sp], #16
+    ldp     x29, x30, [sp], #16
+
+    cmn     x0, #(MAX_ERRNO + 1)
+    cneg    x0, x0, hi
+    b.hi    __set_errno
+
+    ret
+END(%(func)s)
+"""
+
+#
 # ARM assembler templates for each syscall stub
 #
 
@@ -246,6 +269,10 @@
     return stub
 
 
+def aarch64_genstub(syscall):
+    return aarch64_call % syscall
+
+
 def arm_eabi_genstub(syscall):
     num_regs = count_arm_param_registers(syscall["params"])
     if num_regs > 4:
@@ -277,6 +304,7 @@
     result += x86_return % syscall
     return result
 
+
 def x86_genstub_socketcall(syscall):
     #   %ebx <--- Argument 1 - The call id of the needed vectored
     #                          syscall (socket, bind, recv, etc)
@@ -339,6 +367,9 @@
         for syscall in self.syscalls:
             syscall["__NR_name"] = make__NR_name(syscall["name"])
 
+            if syscall.has_key("aarch64"):
+                syscall["asm-aarch64"] = add_footer(64, aarch64_genstub(syscall), syscall)
+
             if syscall.has_key("arm"):
                 syscall["asm-arm"] = add_footer(32, arm_eabi_genstub(syscall), syscall)
 
@@ -357,7 +388,6 @@
             if syscall.has_key("x86_64"):
                 syscall["asm-x86_64"] = add_footer(64, x86_64_genstub(syscall), syscall)
 
-
     # Scan a Linux kernel asm/unistd.h file containing __NR_* constants
     # and write out equivalent SYS_* constants for glibc source compatibility.
     def scan_linux_unistd_h(self, fp, path):
@@ -380,7 +410,9 @@
         glibc_fp.write("#ifndef _BIONIC_GLIBC_SYSCALLS_H_\n")
         glibc_fp.write("#define _BIONIC_GLIBC_SYSCALLS_H_\n")
 
-        glibc_fp.write("#if defined(__arm__)\n")
+        glibc_fp.write("#if defined(__aarch64__)\n")
+        self.scan_linux_unistd_h(glibc_fp, bionic_libc_root + "/kernel/uapi/asm-generic/unistd.h")
+        glibc_fp.write("#elif defined(__arm__)\n")
         self.scan_linux_unistd_h(glibc_fp, bionic_libc_root + "/kernel/arch-arm/asm/unistd.h")
         glibc_fp.write("#elif defined(__mips__)\n")
         self.scan_linux_unistd_h(glibc_fp, bionic_libc_root + "/kernel/arch-mips/asm/unistd.h")