3.3. do_syscall_64 3.4. 系统调用表 3.5. 系统跳转表(sys_call_table) 4. 后记 5. 参考 前言 Linux 操作系统,为了避免用户程序非法操作设备资源,需要限制进程的操作权限,这样内核为用户程序提供了一组交互的接口,用户程序通过这组接口进行 系统调用。 本文将会通过调试方式,从用户程序到内核,理解一下系统调用...
The syscall table is an assembly code implementation of an array in C with 4-byte entries. Each entry is initialized to the address of a function. By convention, we must prepend the name of our function with "sys_." Because the position in the table determines the syscall number, we mus...
实模式下只有shift-and-add方式的segmentation,没有paging,80286保护模式下只有table-based方式的segmentation,也没有paging。80386及其之后的处理器同时有table-based方式的segmentation和paging,其中paging是可选的。 在64-Bit Mode下,segmentation机制虽然还存在,但已经被极度弱化,可以被忽略。Compatibility Mode对segmentation...
”孔子曰：“丘已习其曲矣，未得其数也。”有间，曰：“已习其数，可以益矣。”孔子曰：“丘未得...
GNU汇编程序之所以（GAS）将AT&T语法用于x86汇编是为了与AT&T的x86汇编程序兼容。AT&T选择在他们早期的68000...
介绍x86汇编的书很多,UNIX平台的书都采用AT&T语法,例如[GroudUp],其它书一般采用intel语法,例如[x86Assembly]。 习题 1、把本节例子中的int $0x80指令去掉,汇编、链接也能通过,但是执行的时候出现段错误,你能解释其原因吗? 2. x86的寄存器 x86的通用寄存器有eax、ebx、ecx、edx、edi、esi。这些寄存器在大多数指...
如果一个进程在换页上用的时间多于执行时间，那么这个进程就在颠簸。 频繁的发生缺页中断（抖动），其...
INT x is analogous to PUSHF; CALL dword ptr [x*4]in 16-bit environment. It was widely used in MS-DOS, functioning as a syscall vector. The registers AX/BX/CX/DX/SI/DI were filled with the arguments and then the flow jumped to the address in the Interrupt Vector Table (located at...
This course teaches the x86 architecture (both 32-bit and 64-bit) through a mix of lectures and hands-on programming labs. All topics are explained in lecture format first and then the students are given programming labs in Assembly Language to reinforce the concepts and to get hands-on expe...
Hands-On x86 Assembly Language Basics 4 days All of MindShare's classroom and virtual classroom courses can be customized to fit the needs of your group. Hands-On Intel 32/64-bit x86 Architecture Course Info You Will Learn: x86 architecture basics like an overview of the instruction set, ...