mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 20:13:31 +00:00
3f0bcdc3ef
- Exhaustively document cancellation points - Rename SIGCANCEL to SIGTHR just like BSDs - Further improve POSIX thread cancellations - Ensure asynchronous cancellations work correctly - Elevate the quality of getrandom() and getentropy() - Make futexes cancel correctly on OpenBSD 6.x and 7.x - Add reboot.com and shutdown.com to examples directory - Remove underscore prefix from awesome timespec_*() APIs - Create assertions that help verify our cancellation points - Remove bad timespec APIs (cmp generalizes eq/ne/gt/gte/lt/lte)
535 lines
19 KiB
ArmAsm
535 lines
19 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
||
│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
|
||
╞══════════════════════════════════════════════════════════════════════════════╡
|
||
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
||
│ │
|
||
│ Permission to use, copy, modify, and/or distribute this software for │
|
||
│ any purpose with or without fee is hereby granted, provided that the │
|
||
│ above copyright notice and this permission notice appear in all copies. │
|
||
│ │
|
||
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
||
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
||
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
||
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
||
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
||
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
||
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
||
│ PERFORMANCE OF THIS SOFTWARE. │
|
||
╚─────────────────────────────────────────────────────────────────────────────*/
|
||
#include "libc/intrin/strace.internal.h"
|
||
#include "libc/dce.h"
|
||
#include "libc/macros.internal.h"
|
||
#include "libc/nexgen32e/macros.h"
|
||
#include "libc/sysv/consts/sig.h"
|
||
#include "libc/thread/posixthread.internal.h"
|
||
#include "libc/sysv/consts/nr.h"
|
||
|
||
#define SIG_IGN 1
|
||
|
||
/* ▄▄▄
|
||
▄▄▄ ▀▓▓▒▄
|
||
▄▓▒▒░ ▀▓▒▒▒▄
|
||
▄▓▓▓▒▀ ▄▄▄▄ ▒▓▒▒░▒▄
|
||
▄▓▓▓▒▓ ▄▄▓██▓▓▓▓▒▒▒▒▓▓▄▄▓▓▒▒▒░░▒
|
||
▓▓▓▓▒▒▒▄▄ ░▒█▓▓▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▓▒░░▒░
|
||
██▓▓▓▒▒░░▒▒▒▒▓▓▓▓▓▓▒▓▒░▒▒░▀▒▒▒▒░▀░▒▒▒░▒
|
||
▓▓▓▓▓▓▓▒▒▒▒▒▒▓▓▒▓▓▒▒▒░▒▒░░ ░▒▒░ ░▒▒▒▒
|
||
▀▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▒▒░░▒░░ ░▒▒ ░ ▀▒▒
|
||
▀▓▓█▓▓▓▓▓▓▓▓▓▓▒▒░░▒▒░░ ░░░▓░ ▓░░░▒
|
||
▀▀█▓███▓▓▓▓▓▒▒░░░▒░░ ░█▓░█▓░█▓▓▄▒░
|
||
░▓██▓▓▓▓▓▒▒░░░▒░░ ░████▓▒▓█▓▀░▀▄
|
||
░▓██▓▓▓▓▓▒▒▒░░░▒░░ ▒██▓▒▒▒▒▒▒░░░▒
|
||
████▓▓▓▓▓▒▒▒▒▒▒▒▒▒░░▒▓▓▒░░░░▒░░░▒░ ░░░░░
|
||
░▓███▓▓▓▓▓▒▒░░░░░░░▒▒▒▒▒▒▒▒▒▒▒░░░ ░░░░░ ░
|
||
▓███▓▓▓▓▓▒▓▒▒▒▒░░░░░░░░░▒▓▒▒░▀ ░░░ ░░░░░
|
||
▀▒██▓▓▓▓▒▒▒▓▓▓▓▒▒▒▒▒▒▒▓▀▀░ ░░░░░░░░░ ░
|
||
▓▓▓▓▓▓▓▒▓▒▒▒▒▓▓▓▒▀░ ░░░░░▄░░░ ░░░ ░░░░░░
|
||
▓▓▓▒▒▒▒▒▒▒▒▒▒▒▓ █▓▒░░▒░░░░ ░░░░░░░░
|
||
▄▓▓▓▒▒▒▒▒░░░░░░░▒▄▄▄░▒▓▓▒▒░▀░
|
||
░▓█▓▓▒▒▒▒▒▒▒▒▒▒▒▒▒▒▓▓▓▓▓▓▒░░░▒ besiyata
|
||
▓▓█▓▓▒▓▓▓▒▒▒░░░░░░▒▓▓▓▓▒▒▒▒▒░ dishmaya
|
||
▓▓█▓▓▓▓▓▓▒▒▒░░░░░░░▒▓▓▒▀▀▀
|
||
▓▓██▓▓▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▀
|
||
█▓▓█▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▀
|
||
▒▓▓▓▓▀░░▒▓▓▓▓▓▓▓▓▒▒░░▒
|
||
▄▓▓▀░░░▄▓▓▓▓▒▒▒▒▒░░░░▄░
|
||
▄███▄▄▓▓▓▓▓▓▓▒▒▒▒▒░░▒▒░
|
||
▄▓▓▓█▓█▓▓███▓▓▓▓▓▓▓▓▓▓▓░
|
||
▄░▓▓▓▓▓▓▀▒▓▓▓▒▒▓▒░░░▒▓▒░░░▓
|
||
▄▄▄░▒▓▓▓▓▓▓░▀▀ ▓▓▒░▓▒▒▒▒▒▒▒▒▒▒▄░░▀▀░░ ▄▄▄▄
|
||
▄▄▄▒▒▓▓█▓▓▓▓▓▀▀▀▀▀ ▓▓▓▓▓▒▒▒▒▒▒▒▒▒▒▒▒▒▀░░▀░░▒▒▒░░░ ░░░░░
|
||
▄▓▓▓▒▀▀ ▓▒▓▓▓▓▓▒▒▒▒▒▒▒▒▓░░░ ▒▒▒░░░░░░░░▒
|
||
█▓▓▒ ▄▄▄ ▀▓▒▓▒▒▒▓▓▓▓▓▓▒▒▒░░░░░░░░░▒▒░░░░░░░
|
||
▀▓▓▓▓▒▄▄▒▒▒▒▒▒▄▄ ▀▀▀▀░░▒▒▒▒░░░░░░
|
||
▀▀▀▓▓▓▓▒▒▒▒▒▓▓▄▄
|
||
╔────────────────────────────────────────────────────────────────────────────│─╗
|
||
│ cosmopolitan § bell system five » system call support ─╬─│┼
|
||
╚────────────────────────────────────────────────────────────────────────────│*/
|
||
|
||
.initbss 300,_init_systemfive
|
||
__hostos:
|
||
.quad 0
|
||
.endobj __hostos,globl,hidden
|
||
|
||
// Performs System Five System Call.
|
||
//
|
||
// Cosmopolitan is designed to delegate all function calls into the
|
||
// Linux, FreeBSD, OpenBSD, and XNU kernels via this function, with
|
||
// few exceptions. This function should generally only be called by
|
||
// generated thunks in the libc/sysv/syscalls/ directory.
|
||
//
|
||
// It's safe to call this function on Windows, where it will always
|
||
// return -1 with errno == ENOSYS. Further note that -1 is the only
|
||
// return value that means error, a common anti-pattern is to check
|
||
// for values less than 0 (which is more problematic on 32-bit).
|
||
//
|
||
// It is important to consider that system calls are one order of a
|
||
// magnitude more expensive than normal function calls. For example
|
||
// getpid() on Linux usually takes 500ns, and cached i/o calls will
|
||
// take 1µs or more. So we don't need to inline them like Chromium.
|
||
//
|
||
// Another thing to consider is that BSDs only loosely follow the
|
||
// System Five ABI for the SYSCALL instruction. For example Linux
|
||
// always follows the six argument limit but the FreeBSD sendfile
|
||
// system call accepts a seventh argument that is passed on stack
|
||
// and OpenBSD modifies functions like mmap so that the sixth arg
|
||
// is passed on the stack. There's also the carry flag convention
|
||
// that XNU, FreeBSD, and OpenBSD inherited from 386BSD aka Jolix
|
||
//
|
||
// @param %rax function ordinal supplied by jump slot
|
||
// @param %rdi,%rsi,%rdx,%rcx,%r8,%r9 and rest on stack
|
||
// @return %rax:%rdx is result, or -1 w/ errno on error
|
||
// @clob %rcx,%r10,%r11
|
||
// @see syscalls.sh
|
||
__systemfive:
|
||
.quad 0
|
||
.endobj __systemfive,globl,hidden
|
||
__pid: .quad 0
|
||
.endobj __pid,globl,hidden
|
||
.previous
|
||
|
||
systemfive_cp:
|
||
push %rbp
|
||
mov %rsp,%rbp # so backtraces work
|
||
systemfive_cancellable: # our pthread_cancel() miracle code
|
||
cmpb $0,__tls_enabled(%rip) # inspired by the musl libc design!
|
||
je 1f # we handle linux and bsd together!
|
||
mov %fs:0,%r10 # CosmoTib::tib_self
|
||
mov 0x28(%r10),%r10 # CosmoTib::tib_pthread
|
||
test %r10,%r10 # is it a posix thread?
|
||
jz 1f # it's spawn() probably
|
||
testb $PT_NOCANCEL,0x00(%r10) # PosixThread::flags
|
||
jnz 1f # canceler no cancelling
|
||
#if IsModeDbg()
|
||
testb $PT_INCANCEL,0x00(%r10)
|
||
jz 5f
|
||
#endif
|
||
cmp $0,0x04(%r10) # PosixThread::cancelled
|
||
jne systemfive_cancel # we will tail call below
|
||
1: mov %rcx,%r10 # move the fourth argument
|
||
clc # no cancellable system calls exist
|
||
syscall # that have 7+ args on the bsd OSes
|
||
systemfive_cancellable_end: # i/o calls park here for long time
|
||
pop %rbp
|
||
jnc 2f
|
||
neg %rax # turns bsd errno to system v errno
|
||
2: cmp $-4095,%rax # but we still check again on eintr
|
||
jae 3f # branch because system call failed
|
||
ret # done if the system call succeeded
|
||
3: neg %eax # now examine the nature of failure
|
||
cmp EINTR(%rip),%eax # did the SIGTHR cancel our IO call
|
||
jne systemfive_errno # werent interrupted by OnSigCancel
|
||
cmpb $0,__tls_enabled(%rip) # make sure it's safe to grab %fs:0
|
||
je systemfive_errno # tls is disabled we can't continue
|
||
mov %fs:0,%rcx # CosmoTib::tib_self
|
||
mov 0x28(%rcx),%rcx # CosmoTib::tib_pthread
|
||
test %rcx,%rcx # is it a posix thread?
|
||
jz systemfive_errno # it's spawn() probably
|
||
testb $PT_NOCANCEL,0x00(%rcx) # PosixThread::flags
|
||
jnz systemfive_errno # cancellation is disabled
|
||
cmp $0,0x04(%rcx) # PosixThread::cancelled
|
||
je systemfive_errno # we aren't actually cancelled
|
||
jmp 4f # now we are in fact cancelled
|
||
systemfive_cancel: # SIGTHR will jump here too
|
||
pop %rbp
|
||
4: jmp _pthread_cancel_sys # tail call
|
||
.weak _pthread_cancel_sys # must be linked if we're cancelled
|
||
#if IsModeDbg()
|
||
not_a_cancellation_point: # need BEGIN/END_CANCELLATION_POINT
|
||
nop
|
||
.weak report_cancellation_point
|
||
5: ezlea report_cancellation_point,cx
|
||
test %rcx,%rcx
|
||
jz 6f
|
||
call *%rcx
|
||
6: ud2
|
||
nop
|
||
#endif
|
||
.globl systemfive_cancellable_end
|
||
.globl systemfive_cancellable
|
||
.globl systemfive_cancel
|
||
.endfn systemfive_cp
|
||
|
||
.Lanchorpoint:
|
||
#if SupportsLinux() || SupportsMetal()
|
||
systemfive_linux:
|
||
and $0xfff,%eax # remove nonlinux bits from ordinal
|
||
cmp $0xfff,%eax # checks if unsupported by platform
|
||
je systemfive_enosys # never taken branches cost nothing
|
||
btr $11,%eax # 0x800 means a call is cancellable
|
||
jc systemfive_cp # it is handled by the holiest code
|
||
mov %rcx,%r10 # syscall instruction clobbers %rcx
|
||
push %rbp # linux never reads args from stack
|
||
mov %rsp,%rbp # having frame will help backtraces
|
||
syscall # this is known as a context switch
|
||
pop %rbp # next we check to see if it failed
|
||
cmp $-4095,%rax # system five nexgen32e abi § a.2.1
|
||
jae systemfive_error # encodes errno as neg return value
|
||
ret
|
||
.endfn systemfive_linux,globl,hidden
|
||
systemfive_error:
|
||
neg %eax
|
||
// 𝑠𝑙𝑖𝑑𝑒
|
||
.endfn systemfive_error,globl,hidden
|
||
#endif
|
||
systemfive_errno:
|
||
xchg %eax,%ecx
|
||
.errno
|
||
mov %ecx,(%rax) # normalize to c library convention
|
||
push $-1 # negative one is only error result
|
||
pop %rax # the push pop is to save code size
|
||
ret
|
||
.endfn systemfive_errno,globl,hidden
|
||
systemfive_enosys:
|
||
mov ENOSYS(%rip),%eax
|
||
jmp systemfive_errno
|
||
.endfn systemfive_enosys,globl,hidden
|
||
#if SupportsNetbsd()
|
||
systemfive_netbsd:
|
||
shr $4*13,%rax
|
||
jmp systemfive_bsdscrub
|
||
.endfn systemfive_netbsd,globl,hidden
|
||
#endif
|
||
#if SupportsOpenbsd()
|
||
systemfive_openbsd:
|
||
shr $4*10,%rax
|
||
jmp systemfive_bsdscrub
|
||
.endfn systemfive_openbsd,globl,hidden
|
||
#endif
|
||
#if SupportsFreebsd()
|
||
systemfive_freebsd:
|
||
shr $4*7,%rax
|
||
movzwl %ax,%eax
|
||
// 𝑠𝑙𝑖𝑑𝑒
|
||
.endfn systemfive_freebsd,globl,hidden
|
||
#endif
|
||
#if SupportsBsd()
|
||
systemfive_bsdscrub:
|
||
and $0xfff,%eax
|
||
// 𝑠𝑙𝑖𝑑𝑒
|
||
.endfn systemfive_bsdscrub,globl,hidden
|
||
systemfive_bsd:
|
||
cmp $0xfff,%ax
|
||
je systemfive_enosys
|
||
btr $11,%eax # checks/reset the 800 cancellable bit
|
||
jc systemfive_cp
|
||
mov %rcx,%r10
|
||
syscall # bsd will need arg on stack sometimes
|
||
jc systemfive_errno # bsd sets carry flag if %rax is errno
|
||
ret
|
||
.endfn systemfive_bsd
|
||
#endif
|
||
#if SupportsXnu()
|
||
systemfive_xnu:
|
||
// 0x?????????2153??? # how syscalls.sh encodes xnu ordinals
|
||
// │└┴┴┐
|
||
// │ ├┬┐
|
||
// 0x0000000002000153 # how xnu wants ordinals to be encoded
|
||
mov %eax,%r11d
|
||
and $0x0f000000,%r11d
|
||
shl $8,%eax
|
||
shr $20,%eax
|
||
or %r11d,%eax
|
||
jmp systemfive_bsd
|
||
.endfn systemfive_xnu,globl,hidden
|
||
#endif
|
||
.previous
|
||
|
||
// Initializes System Five system call support.
|
||
//
|
||
// (1) Extracts parameters passed by kernel
|
||
// (2) Detects OS without issuing system calls
|
||
// (3) Unpacks magnums from libc/sysv/consts.sh
|
||
// (4) Replaces stack with one we control
|
||
//
|
||
// @param %r15 is auxv
|
||
// @note OpenBSD devs: let us know if you start using auxv
|
||
.init.start 300,_init_systemfive
|
||
push %rbx
|
||
push %rsi
|
||
// Detect the operating system.
|
||
mov (%rdi),%eax # __hostos
|
||
#if SupportsWindows() || SupportsXnu() || SupportsFreebsd()
|
||
// set by libc/ape.S for XNU
|
||
// set by libc/crt/crt.S for XNU/FreeBSD
|
||
// set by libc/nt/winmain.greg.c for New Technology
|
||
test %eax,%eax
|
||
jnz _init_systemfive_detected # os is already known
|
||
#endif
|
||
#if SupportsOpenbsd()
|
||
cmpq $0,(%r15) # OpenBSD has no auxv
|
||
jnz 0f
|
||
mov $_HOSTOPENBSD,%al
|
||
jmp _init_systemfive_detected
|
||
0:
|
||
#endif
|
||
#if SupportsNetbsd()
|
||
xor %ecx,%ecx
|
||
0: cmpq $2014,(%r15,%rcx,8) # NetBSD's AT_EXECFN
|
||
jne 1f
|
||
mov $_HOSTNETBSD,%al
|
||
jmp _init_systemfive_detected
|
||
1: cmpq $0,(%r15,%rcx,8)
|
||
lea 2(%ecx),%ecx
|
||
jnz 0b
|
||
2:
|
||
#endif
|
||
mov $_HOSTLINUX,%al
|
||
_init_systemfive_detected:
|
||
stosq #→ __hostos
|
||
bsr %eax,%eax
|
||
mov $_init_systemfive_jmptab,%ebx
|
||
movzbl (%rbx,%rax),%eax
|
||
lea (%rbx,%rax),%eax
|
||
jmp *%rax
|
||
_init_systemfive_jmptab:
|
||
.byte _init_systemfive_linux-_init_systemfive_jmptab
|
||
.byte _init_systemfive_metal-_init_systemfive_jmptab
|
||
.byte _init_systemfive_windows-_init_systemfive_jmptab
|
||
.byte _init_systemfive_xnu-_init_systemfive_jmptab
|
||
.byte _init_systemfive_openbsd-_init_systemfive_jmptab
|
||
.byte _init_systemfive_freebsd-_init_systemfive_jmptab
|
||
.byte _init_systemfive_netbsd-_init_systemfive_jmptab
|
||
.endobj _init_systemfive_jmptab
|
||
_init_systemfive_linux:
|
||
#if SupportsLinux()
|
||
pushb systemfive_linux-.Lanchorpoint
|
||
mov $syscon_linux,%esi
|
||
jmp _init_systemfive_os
|
||
#endif
|
||
.endfn _init_systemfive_linux
|
||
_init_systemfive_metal:
|
||
#if SupportsMetal()
|
||
pushb systemfive_enosys-.Lanchorpoint
|
||
mov $syscon_linux,%esi
|
||
jmp _init_systemfive_os
|
||
#endif
|
||
.endfn _init_systemfive_metal
|
||
_init_systemfive_windows:
|
||
#if SupportsWindows()
|
||
pushb systemfive_enosys-.Lanchorpoint
|
||
mov $syscon_windows,%esi
|
||
jmp _init_systemfive_os
|
||
#endif
|
||
.endfn _init_systemfive_windows
|
||
_init_systemfive_xnu:
|
||
#if SupportsXnu()
|
||
pushb systemfive_xnu-.Lanchorpoint
|
||
mov $syscon_xnu,%esi
|
||
jmp _init_systemfive_os
|
||
#endif
|
||
.endfn _init_systemfive_xnu
|
||
_init_systemfive_openbsd:
|
||
#if SupportsOpenbsd()
|
||
pushb systemfive_openbsd-.Lanchorpoint
|
||
mov $syscon_openbsd,%esi
|
||
jmp _init_systemfive_os
|
||
#endif
|
||
.endfn _init_systemfive_openbsd
|
||
_init_systemfive_freebsd:
|
||
#if SupportsFreebsd()
|
||
pushb systemfive_freebsd-.Lanchorpoint
|
||
mov $syscon_freebsd,%esi
|
||
jmp _init_systemfive_os
|
||
#endif
|
||
.endfn _init_systemfive_freebsd
|
||
_init_systemfive_netbsd:
|
||
#if SupportsNetbsd()
|
||
pushb systemfive_netbsd-.Lanchorpoint
|
||
mov $syscon_netbsd,%esi
|
||
// 𝑠𝑙𝑖𝑑𝑒
|
||
#endif
|
||
.endfn _init_systemfive_netbsd
|
||
_init_systemfive_os:
|
||
pop %rax
|
||
add $.Lanchorpoint,%eax
|
||
stosq #→ __systemfive
|
||
// 𝑠𝑙𝑖𝑑𝑒
|
||
.endfn _init_systemfive_os
|
||
_init_systemfive_magnums:
|
||
push %rdi
|
||
mov $syscon_start,%edi
|
||
2: cmp $syscon_end,%edi
|
||
jnb 5f
|
||
xor %ebx,%ebx
|
||
xor %ecx,%ecx
|
||
xor %edx,%edx
|
||
3: lodsb # decodes uleb128
|
||
movzbl %al,%edx
|
||
and $127,%dl
|
||
shl %cl,%rdx
|
||
or %rdx,%rbx
|
||
add $7,%cl
|
||
test $128,%al
|
||
jnz 3b
|
||
xchg %rbx,%rax
|
||
stosq
|
||
#ifdef SYSDEBUG
|
||
inc %r8d
|
||
#endif
|
||
jmp 2b
|
||
5: nop
|
||
#ifdef SYSDEBUG
|
||
push %rdi
|
||
push %rsi
|
||
push %r8
|
||
call __describe_os
|
||
mov %rax,%rdx
|
||
pop %r8
|
||
.weak __stracef
|
||
ezlea __stracef,ax
|
||
test %rax,%rax
|
||
jz 5f
|
||
ezlea .Llog,di
|
||
mov %r8d,%esi
|
||
call *%rax
|
||
5: pop %rsi
|
||
pop %rdi
|
||
#endif /* DEBUGSYS */
|
||
pop %rdi
|
||
pop %rsi
|
||
pop %rbx
|
||
// 𝑠𝑙𝑖𝑑𝑒
|
||
.endfn _init_systemfive_magnums
|
||
#if SupportsSystemv()
|
||
_init_systemfive_pid:
|
||
ezlea __hostos,cx
|
||
mov (%rcx),%al
|
||
mov (%rdi),%eax
|
||
testb $_HOSTWINDOWS|_HOSTMETAL,(%rcx)
|
||
jnz 1f
|
||
mov __NR_getpid,%eax
|
||
syscall
|
||
1: stosq
|
||
.endfn _init_systemfive_pid
|
||
#endif
|
||
#if SupportsBsd() && !defined(TINY)
|
||
_init_systemfive_sigsys:
|
||
testb IsBsd() # BSDs will trap SIGSYS!
|
||
jz 1f # We want ENOSYS instead
|
||
push %rdi # XNU removed some calls
|
||
push %rsi # in past, so this makes
|
||
xor %eax,%eax # troubleshooting easier
|
||
push %rax # but it's non-essential
|
||
push %rax
|
||
push %rax
|
||
push %rax
|
||
push %rax
|
||
push $SIG_IGN # sigaction_meta size 48
|
||
mov __NR_sigaction,%eax # mag
|
||
mov SIGSYS,%edi # sig
|
||
mov %rsp,%rsi # new
|
||
xor %edx,%edx # old
|
||
mov $8,%r10d # for linux
|
||
xor %r8d,%r8d # for netbsd
|
||
syscall
|
||
add $6*8,%rsp
|
||
pop %rsi
|
||
pop %rdi
|
||
1: .endfn _init_systemfive_sigsys
|
||
#endif
|
||
_init_systemfive_done:
|
||
nop
|
||
.init.end 300,_init_systemfive,globl,hidden
|
||
|
||
// Sections for varint encoded magic numbers.
|
||
//
|
||
// These sections are all ordered by (group_name, constant_name).
|
||
// They're populated by modules simply referencing the symbols.
|
||
//
|
||
// @see libc/sysv/consts.sh
|
||
// @see libc/sysv/consts/syscon_h
|
||
.section .piro.bss.sort.syscon.1,"aw",@nobits
|
||
.align 8
|
||
syscon_start:/*
|
||
...decentralized quadwords...
|
||
*/.previous
|
||
.section .piro.bss.sort.syscon.3,"aw",@nobits
|
||
syscon_end:
|
||
.previous
|
||
.type syscon_start,@object
|
||
.type syscon_end,@object
|
||
.globl syscon_start
|
||
.globl syscon_end
|
||
#if SupportsLinux() || SupportsMetal()
|
||
.section .sort.rodata.syscon.linux.1,"a",@progbits
|
||
.align 1
|
||
syscon_linux:/*
|
||
...decentralized leb128...
|
||
*/.previous
|
||
.type syscon_linux,@object
|
||
.globl syscon_linux
|
||
#endif
|
||
#if SupportsXnu()
|
||
.section .sort.rodata.syscon.xnu.1,"a",@progbits
|
||
.align 1
|
||
syscon_xnu:/*
|
||
...decentralized leb128...
|
||
*/.previous
|
||
.type syscon_xnu,@object
|
||
.globl syscon_xnu
|
||
#endif
|
||
#if SupportsFreebsd()
|
||
.section .sort.rodata.syscon.freebsd.1,"a",@progbits
|
||
.align 1
|
||
syscon_freebsd:/*
|
||
...decentralized leb128...
|
||
*/.previous
|
||
.type syscon_freebsd,@object
|
||
.globl syscon_freebsd
|
||
#endif
|
||
#if SupportsOpenbsd()
|
||
.section .sort.rodata.syscon.openbsd.1,"a",@progbits
|
||
.align 1
|
||
syscon_openbsd:/*
|
||
...decentralized leb128...
|
||
*/.previous
|
||
.type syscon_openbsd,@object
|
||
.globl syscon_openbsd
|
||
#endif
|
||
#if SupportsNetbsd()
|
||
.section .sort.rodata.syscon.netbsd.1,"a",@progbits
|
||
.align 1
|
||
syscon_netbsd:/*
|
||
...decentralized leb128...
|
||
*/.previous
|
||
.type syscon_netbsd,@object
|
||
.globl syscon_netbsd
|
||
#endif
|
||
#if SupportsWindows()
|
||
.section .sort.rodata.syscon.windows.1,"a",@progbits
|
||
.align 1
|
||
syscon_windows:/*
|
||
...decentralized leb128...
|
||
*/.previous
|
||
.type syscon_windows,@object
|
||
.globl syscon_windows
|
||
#endif
|
||
|
||
#ifdef SYSDEBUG
|
||
.rodata.str1.1
|
||
.Llog: .ascii STRACE_PROLOGUE
|
||
.ascii "bell system five system call support"
|
||
.asciz " %'u magnums loaded on %s\n"
|
||
.previous
|
||
#endif /* DEBUGSYS */
|