Rewrite the vDSOs for CloudABI in assembly.

The reason why the old vDSOs were written in C using inline assembly was
purely because they were embedded in the C library directly as static
inline functions. This was practical during development, because it
meant you could invoke system calls without any library dependencies.
The vDSO was simply a copy of these functions.

Now that we require the use of the vDSO, there is no longer any need for
embedding them in C code directly. Rewriting them in assembly has the
advantage that they are closer to ideal (less useless branching, less
assumptions about registers remaining unclobbered by the kernel, etc).
They are also easier to build, as they no longer depend on the C type
information for CloudABI.

Obtained from:	https://github.com/NuxiNL/cloudabi

1 files changed, 511 insertions, 0 deletions

diff --git a/sys/contrib/cloudabi/cloudabi_vdso_x86_64.S b/sys/contrib/cloudabi/cloudabi_vdso_x86_64.S
new file mode 100644
index 000000000000..049cb0d8a0cf
--- /dev/null
+++ b/sys/contrib/cloudabi/cloudabi_vdso_x86_64.S
@@ -0,0 +1,511 @@
+// Copyright (c) 2016 Nuxi (https://nuxi.nl/) and contributors.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+// 1. Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+// SUCH DAMAGE.
+//
+// This file is automatically generated. Do not edit.
+//
+// Source: https://github.com/NuxiNL/cloudabi
+
+#define ENTRY(name)      \
+  .text;                 \
+  .p2align 4, 0x90;      \
+  .global name;          \
+  .type name, @function; \
+name:
+
+#define END(name) .size name, . - name
+
+ENTRY(cloudabi_sys_clock_res_get)
+  push %rsi
+  mov $0, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_clock_res_get)
+
+ENTRY(cloudabi_sys_clock_time_get)
+  push %rdx
+  mov $1, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_clock_time_get)
+
+ENTRY(cloudabi_sys_condvar_signal)
+  mov $2, %eax
+  syscall
+  ret
+END(cloudabi_sys_condvar_signal)
+
+ENTRY(cloudabi_sys_fd_close)
+  mov $3, %eax
+  syscall
+  ret
+END(cloudabi_sys_fd_close)
+
+ENTRY(cloudabi_sys_fd_create1)
+  push %rsi
+  mov $4, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %eax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_fd_create1)
+
+ENTRY(cloudabi_sys_fd_create2)
+  push %rsi
+  push %rdx
+  mov $5, %eax
+  syscall
+  pop %rsi
+  pop %rcx
+  jc 1f
+  mov %eax, (%rcx)
+  mov %edx, (%rsi)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_fd_create2)
+
+ENTRY(cloudabi_sys_fd_datasync)
+  mov $6, %eax
+  syscall
+  ret
+END(cloudabi_sys_fd_datasync)
+
+ENTRY(cloudabi_sys_fd_dup)
+  push %rsi
+  mov $7, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %eax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_fd_dup)
+
+ENTRY(cloudabi_sys_fd_pread)
+  mov %rcx, %r10
+  push %r8
+  mov $8, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_fd_pread)
+
+ENTRY(cloudabi_sys_fd_pwrite)
+  mov %rcx, %r10
+  push %r8
+  mov $9, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_fd_pwrite)
+
+ENTRY(cloudabi_sys_fd_read)
+  push %rcx
+  mov $10, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_fd_read)
+
+ENTRY(cloudabi_sys_fd_replace)
+  mov $11, %eax
+  syscall
+  ret
+END(cloudabi_sys_fd_replace)
+
+ENTRY(cloudabi_sys_fd_seek)
+  push %rcx
+  mov $12, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_fd_seek)
+
+ENTRY(cloudabi_sys_fd_stat_get)
+  mov $13, %eax
+  syscall
+  ret
+END(cloudabi_sys_fd_stat_get)
+
+ENTRY(cloudabi_sys_fd_stat_put)
+  mov $14, %eax
+  syscall
+  ret
+END(cloudabi_sys_fd_stat_put)
+
+ENTRY(cloudabi_sys_fd_sync)
+  mov $15, %eax
+  syscall
+  ret
+END(cloudabi_sys_fd_sync)
+
+ENTRY(cloudabi_sys_fd_write)
+  push %rcx
+  mov $16, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_fd_write)
+
+ENTRY(cloudabi_sys_file_advise)
+  mov %rcx, %r10
+  mov $17, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_advise)
+
+ENTRY(cloudabi_sys_file_allocate)
+  mov $18, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_allocate)
+
+ENTRY(cloudabi_sys_file_create)
+  mov %rcx, %r10
+  mov $19, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_create)
+
+ENTRY(cloudabi_sys_file_link)
+  mov %rcx, %r10
+  mov $20, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_link)
+
+ENTRY(cloudabi_sys_file_open)
+  mov %rcx, %r10
+  push %r9
+  mov $21, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %eax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_file_open)
+
+ENTRY(cloudabi_sys_file_readdir)
+  mov %rcx, %r10
+  push %r8
+  mov $22, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_file_readdir)
+
+ENTRY(cloudabi_sys_file_readlink)
+  mov %rcx, %r10
+  push %r9
+  mov $23, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_file_readlink)
+
+ENTRY(cloudabi_sys_file_rename)
+  mov %rcx, %r10
+  mov $24, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_rename)
+
+ENTRY(cloudabi_sys_file_stat_fget)
+  mov $25, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_stat_fget)
+
+ENTRY(cloudabi_sys_file_stat_fput)
+  mov $26, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_stat_fput)
+
+ENTRY(cloudabi_sys_file_stat_get)
+  mov %rcx, %r10
+  mov $27, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_stat_get)
+
+ENTRY(cloudabi_sys_file_stat_put)
+  mov %rcx, %r10
+  mov $28, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_stat_put)
+
+ENTRY(cloudabi_sys_file_symlink)
+  mov %rcx, %r10
+  mov $29, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_symlink)
+
+ENTRY(cloudabi_sys_file_unlink)
+  mov %rcx, %r10
+  mov $30, %eax
+  syscall
+  ret
+END(cloudabi_sys_file_unlink)
+
+ENTRY(cloudabi_sys_lock_unlock)
+  mov $31, %eax
+  syscall
+  ret
+END(cloudabi_sys_lock_unlock)
+
+ENTRY(cloudabi_sys_mem_advise)
+  mov $32, %eax
+  syscall
+  ret
+END(cloudabi_sys_mem_advise)
+
+ENTRY(cloudabi_sys_mem_lock)
+  mov $33, %eax
+  syscall
+  ret
+END(cloudabi_sys_mem_lock)
+
+ENTRY(cloudabi_sys_mem_map)
+  mov %rcx, %r10
+  mov $34, %eax
+  syscall
+  jc 1f
+  mov 8(%rsp), %rcx
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_mem_map)
+
+ENTRY(cloudabi_sys_mem_protect)
+  mov $35, %eax
+  syscall
+  ret
+END(cloudabi_sys_mem_protect)
+
+ENTRY(cloudabi_sys_mem_sync)
+  mov $36, %eax
+  syscall
+  ret
+END(cloudabi_sys_mem_sync)
+
+ENTRY(cloudabi_sys_mem_unlock)
+  mov $37, %eax
+  syscall
+  ret
+END(cloudabi_sys_mem_unlock)
+
+ENTRY(cloudabi_sys_mem_unmap)
+  mov $38, %eax
+  syscall
+  ret
+END(cloudabi_sys_mem_unmap)
+
+ENTRY(cloudabi_sys_poll)
+  push %rcx
+  mov $39, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_poll)
+
+ENTRY(cloudabi_sys_poll_fd)
+  mov %rcx, %r10
+  mov $40, %eax
+  syscall
+  jc 1f
+  mov 8(%rsp), %rcx
+  mov %rax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_poll_fd)
+
+ENTRY(cloudabi_sys_proc_exec)
+  mov %rcx, %r10
+  mov $41, %eax
+  syscall
+  ret
+END(cloudabi_sys_proc_exec)
+
+ENTRY(cloudabi_sys_proc_exit)
+  mov $42, %eax
+  syscall
+END(cloudabi_sys_proc_exit)
+
+ENTRY(cloudabi_sys_proc_fork)
+  push %rdi
+  push %rsi
+  mov $43, %eax
+  syscall
+  pop %rsi
+  pop %rcx
+  jc 1f
+  mov %eax, (%rcx)
+  mov %edx, (%rsi)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_proc_fork)
+
+ENTRY(cloudabi_sys_proc_raise)
+  mov $44, %eax
+  syscall
+  ret
+END(cloudabi_sys_proc_raise)
+
+ENTRY(cloudabi_sys_random_get)
+  mov $45, %eax
+  syscall
+  ret
+END(cloudabi_sys_random_get)
+
+ENTRY(cloudabi_sys_sock_accept)
+  push %rdx
+  mov $46, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %eax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_sock_accept)
+
+ENTRY(cloudabi_sys_sock_bind)
+  mov %rcx, %r10
+  mov $47, %eax
+  syscall
+  ret
+END(cloudabi_sys_sock_bind)
+
+ENTRY(cloudabi_sys_sock_connect)
+  mov %rcx, %r10
+  mov $48, %eax
+  syscall
+  ret
+END(cloudabi_sys_sock_connect)
+
+ENTRY(cloudabi_sys_sock_listen)
+  mov $49, %eax
+  syscall
+  ret
+END(cloudabi_sys_sock_listen)
+
+ENTRY(cloudabi_sys_sock_recv)
+  mov $50, %eax
+  syscall
+  ret
+END(cloudabi_sys_sock_recv)
+
+ENTRY(cloudabi_sys_sock_send)
+  mov $51, %eax
+  syscall
+  ret
+END(cloudabi_sys_sock_send)
+
+ENTRY(cloudabi_sys_sock_shutdown)
+  mov $52, %eax
+  syscall
+  ret
+END(cloudabi_sys_sock_shutdown)
+
+ENTRY(cloudabi_sys_sock_stat_get)
+  mov $53, %eax
+  syscall
+  ret
+END(cloudabi_sys_sock_stat_get)
+
+ENTRY(cloudabi_sys_thread_create)
+  push %rsi
+  mov $54, %eax
+  syscall
+  pop %rcx
+  jc 1f
+  mov %eax, (%rcx)
+  xor %eax, %eax
+1:
+  ret
+END(cloudabi_sys_thread_create)
+
+ENTRY(cloudabi_sys_thread_exit)
+  mov $55, %eax
+  syscall
+END(cloudabi_sys_thread_exit)
+
+ENTRY(cloudabi_sys_thread_yield)
+  mov $56, %eax
+  syscall
+  ret
+END(cloudabi_sys_thread_yield)