diff options
| -rw-r--r-- | LICENSE | 29 | ||||
| -rw-r--r-- | Makefile | 6 | ||||
| -rw-r--r-- | src/c_bsdsetsid.S | 95 | ||||
| -rw-r--r-- | src/u_print.S | 55 | ||||
| -rw-r--r-- | src/u_strlen.S | 46 |
5 files changed, 204 insertions, 27 deletions
@@ -0,0 +1,29 @@ +BSD 3-Clause License + +Copyright (c) 2020, Joe +All rights reserved. + +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. + +3. Neither the name of the copyright holder nor the names of its + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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. @@ -28,9 +28,9 @@ SRCS += ${SRCS_DIR}u_strlen.S OBJS = ${SRCS:.S=.o} -AS = yasm -ASFLAGS = -felf64 -ASFLAGS += -pgas +AS = as +# ASFLAGS = -felf64 +# ASFLAGS += -pgas CC = cc diff --git a/src/c_bsdsetsid.S b/src/c_bsdsetsid.S index de55b7f..4c9189c 100644 --- a/src/c_bsdsetsid.S +++ b/src/c_bsdsetsid.S @@ -1,3 +1,50 @@ +/* + * ======================== + * ===== =============== + * ====== ================ + * ====== ================ + * ====== ==== ==== == + * ====== === == = = + * ====== === = == = + * = === === = == ==== + * = === === = == = = + * == ===== ==== == + * ======================== + * + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 2020 Joe + * All rights reserved. + * + * 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. + * 3. Neither the name of the organization nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JOE ''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 JOE 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. + * + * bsdsetsid: src/c_bsdsetsid.S + * 2020-11-18 12:37 + * Joe + * + * This is the entrypoint of the program. + */ + .text .extern u_strlen .extern u_pout @@ -7,41 +54,49 @@ main: cmpb $0x1, %dil jle c_noarg - push %rdi - push %rsi - push %rdx - xor %rcx, %rcx - mov (%rsi, %rcx, 8), %rdi - mov %rcx, %r8 - call u_pout - mov %r8, %rcx - pop %rdx - pop %rsi - pop %rdi - push %rdi + xor %rax, %rax + movb $0x2, %al /* SYS_fork */ + syscall + jc c_fork_fail + cmp $0x0, %rax + je c_child + +c_child: + xor %rax, %rax + movb $0x93, %al /* SYS_setsid */ + syscall + xor %rax, %rax push %rsi - push %rdx - inc %rcx + mov $0x1, %rcx mov (%rsi, %rcx, 8), %rdi - call u_pout - pop %rdx + lea 0(%rsi, %rcx, 8), %rsi + movb $0x3b, %al /* SYS_execve */ + syscall pop %rsi - pop %rdi jmp c_exit +c_fork_fail: + lea forkfail_str, %rdi + call u_perr + mov $0x2, %rdi + xor %rax, %rax + movb $0x1, %al /* SYS_exit */ + syscall + c_noarg: lea noarg_str, %rdi call u_perr mov $0x1, %rdi xor %rax, %rax - movb $0x1, %al # SYS_exit + movb $0x1, %al /* SYS_exit */ syscall c_exit: xor %rdi, %rdi xor %rax, %rax - movb $0x1, %al # SYS_exit + movb $0x1, %al /* SYS_exit */ syscall .data -noarg_str: .asciz "bsdsetsid: no command specified" +noarg_str: .asciz "bsdsetsid: no command specified" +forkfail_str: .asciz "bsdsetsid: fork failed" diff --git a/src/u_print.S b/src/u_print.S index 47a9483..969cf28 100644 --- a/src/u_print.S +++ b/src/u_print.S @@ -1,14 +1,61 @@ +/* + * ======================== + * ===== =============== + * ====== ================ + * ====== ================ + * ====== ==== ==== == + * ====== === == = = + * ====== === = == = + * = === === = == ==== + * = === === = == = = + * == ===== ==== == + * ======================== + * + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 2020 Joe + * All rights reserved. + * + * 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. + * 3. Neither the name of the organization nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JOE ''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 JOE 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. + * + * bsdsetsid: src/c_bsdsetsid.S + * 2020-11-19 13:27 + * Joe + * + * Util functions to print to standard out or standard error. + */ + .text .extern u_strlen .globl u_pout .globl u_perr u_pout: - mov $0x1, %r11 # stdout + mov $0x1, %r11 /* stdout */ jmp u_print u_perr: - mov $0x2, %r11 # stderr + mov $0x2, %r11 /* stderr */ jmp u_print u_print: @@ -16,11 +63,11 @@ u_print: mov %rax, %rdx mov %rdi, %rsi mov %r11, %rdi - mov $0x4, %rax # SYS_write + mov $0x4, %rax /* SYS_write */ syscall lea nl, %rsi mov $0x1, %rdx - mov $0x4, %rax # SYS_write + mov $0x4, %rax /* SYS_write */ syscall ret diff --git a/src/u_strlen.S b/src/u_strlen.S index b1e2447..2cfbb1b 100644 --- a/src/u_strlen.S +++ b/src/u_strlen.S @@ -1,3 +1,49 @@ +/* + * ======================== + * ===== =============== + * ====== ================ + * ====== ================ + * ====== ==== ==== == + * ====== === == = = + * ====== === = == = + * = === === = == ==== + * = === === = == = = + * == ===== ==== == + * ======================== + * + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 2020 Joe + * All rights reserved. + * + * 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. + * 3. Neither the name of the organization nor the + * names of its contributors may be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JOE ''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 JOE 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. + * + * bsdsetsid: src/c_bsdsetsid.S + * 2020-11-19 14:10 + * Joe + * + * Simple implementation of strlen. + */ .text .globl u_strlen |