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AArch64: Add support for AArch64 to the syscall interface

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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>
This commit is contained in:
Serban Constantinescu
2013-10-07 16:49:09 +01:00
committed by Elliott Hughes
parent 07d3c6cecc
commit feaa89a1bc
3 changed files with 87 additions and 55 deletions
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36
libc/tools/gensyscalls.py
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@@ -55,6 +55,29 @@ function_alias = """
"""
#
# 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 @@ def add_footer(pointer_length, stub, syscall):
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 @@ def x86_genstub(syscall):
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 @@ class State:
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 @@ class State:
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 @@ class State:
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")