cosmopolitan/libc/runtime/clone-linux.S

/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8     -*-│
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8                                     :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 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/macros.internal.h"
.privileged

//	Invokes clone() system call on GNU/Systemd.
//
//	@param	rdi is flags
//	@param	rsi is top of stack
//	@param	rdx is ptid
//	@param	rcx is ctid
//	@param	r8 is tls
//	@param	r9 is func(void*,int)→int
//	@param	8(rsp) is arg
//	@return	tid of child on success, or -1 w/ errno
sys_clone_linux:
	push	%rbp
	mov	%rsp,%rbp
	push	%rbx
	mov	%rcx,%r10
	mov	16(%rbp),%rbx
	mov	$56,%eax		# __NR_clone
	syscall
	test	%rax,%rax
	jz	2f
	cmp	$-4095,%rax
	jae	1f
0:	pop	%rbx
	pop	%rbp
	ret
1:	call	systemfive_error
	jmp	0b
2:	xor	%ebp,%ebp		# child thread
	mov	%rbx,%rdi		# arg
	mov	(%r10),%esi		# tid
	call	*%r9			# func(arg,tid)
	xchg	%eax,%edi		# func(arg,tid) → exitcode
	mov	$60,%eax		# __NR_exit(exitcode)
	syscall
	.endfn	sys_clone_linux,globl,hidden
Polish up repository and other revisions 2020-06-16 13:38:43 +00:00			`/-- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│`
Initial import 2020-06-15 14:18:57 +00:00			`│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│`
			`╞══════════════════════════════════════════════════════════════════════════════╡`
Fix some issues and do some code cleanup 2022-05-23 17:15:53 +00:00			`│ Copyright 2022 Justine Alexandra Roberts Tunney │`
Initial import 2020-06-15 14:18:57 +00:00			`│ │`
Change license 2020-12-28 01:18:44 +00:00			`│ 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. │`
Initial import 2020-06-15 14:18:57 +00:00			`│ │`
Change license 2020-12-28 01:18:44 +00:00			`│ 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. │`
Initial import 2020-06-15 14:18:57 +00:00			`╚─────────────────────────────────────────────────────────────────────────────*/`
Remove more nonstandard stuff from cosmopolitan.h Fixes #61 2021-03-01 07:42:35 +00:00			`#include "libc/macros.internal.h"`
Strengthen the pledge() polyfill 2022-06-27 20:01:58 +00:00			`.privileged`
Initial import 2020-06-15 14:18:57 +00:00
Fix some issues and do some code cleanup 2022-05-23 17:15:53 +00:00			`// Invokes clone() system call on GNU/Systemd.`
Add raw memory visualization tool to redbean This change introduces a `-W /dev/pts/1` flag to redbean. What it does is use the mincore() system call to create a dual-screen terminal display that lets you troubleshoot the virtual address space. This is useful since page faults are an important thing to consider when using a forking web server. Now we have a colorful visualization of which pages are going to fault and which ones are resident in memory. The memory monitor, if enabled, spawns as a thread that just outputs ANSI codes to the second terminal in a loop. In order to make this happen using the new clone() polyfill, stdio is now thread safe. This change also introduces some new demo pages to redbean. It also polishes the demos we already have, to look a bit nicer and more presentable for the upcoming release, with better explanations too. 2022-05-14 11:33:58 +00:00			`//`
Fix some issues and do some code cleanup 2022-05-23 17:15:53 +00:00			`// @param rdi is flags`
			`// @param rsi is top of stack`
			`// @param rdx is ptid`
			`// @param rcx is ctid`
			`// @param r8 is tls`
Make _Thread_local work across platforms We now rewrite the binary image at runtime on Windows and XNU to change mov %fs:0,%reg instructions to use %gs instead. There's also simpler threading API introduced by this change and it's called _spawn() and _join(), which has replaced most clone() usage. 2022-07-10 11:01:17 +00:00			`// @param r9 is func(void*,int)→int`
Fix some issues and do some code cleanup 2022-05-23 17:15:53 +00:00			`// @param 8(rsp) is arg`
			`// @return tid of child on success, or -1 w/ errno`
			`sys_clone_linux:`
			`push %rbp`
			`mov %rsp,%rbp`
			`push %rbx`
			`mov %rcx,%r10`
			`mov 16(%rbp),%rbx`
			`mov $56,%eax # __NR_clone`
			`syscall`
			`test %rax,%rax`
			`jz 2f`
			`cmp $-4095,%rax`
			`jae 1f`
			`0: pop %rbx`
			`pop %rbp`
			`ret`
			`1: call systemfive_error`
			`jmp 0b`
			`2: xor %ebp,%ebp # child thread`
			`mov %rbx,%rdi # arg`
Make _Thread_local work across platforms We now rewrite the binary image at runtime on Windows and XNU to change mov %fs:0,%reg instructions to use %gs instead. There's also simpler threading API introduced by this change and it's called _spawn() and _join(), which has replaced most clone() usage. 2022-07-10 11:01:17 +00:00			`mov (%r10),%esi # tid`
			`call *%r9 # func(arg,tid)`
			`xchg %eax,%edi # func(arg,tid) → exitcode`
Fix some issues and do some code cleanup 2022-05-23 17:15:53 +00:00			`mov $60,%eax # __NR_exit(exitcode)`
			`syscall`
			`.endfn sys_clone_linux,globl,hidden`