C指针的理解

c语言中变量对应汇编立即数寻址，指针对应寄存器寻址，指针的指针对应寄存器间接寻址。用下面这段代码作为例子：
test.c：

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char **argv)
{
    int a = 5;
    int *p1 = &a;
    int **p2 = &p1;

    return 0;
}

arm-cortexa9-linux-gnueabihf-gcc -S test.c -emain -fomit-frame-pointer -O0
test.s

   .arch armv7-a
    .eabi_attribute 27, 3
    .eabi_attribute 28, 1
    .fpu vfpv3
    .eabi_attribute 20, 1
    .eabi_attribute 21, 1
    .eabi_attribute 23, 3
    .eabi_attribute 24, 1
    .eabi_attribute 25, 1
    .eabi_attribute 26, 2
    .eabi_attribute 30, 6
    .eabi_attribute 34, 1
    .eabi_attribute 18, 4
    .file    "test.c"
    .text
    .align    2
    .global    main
    .type    main, %function
main:
    @ args = 0, pretend = 0, frame = 24
    @ frame_needed = 0, uses_anonymous_args = 0
    @ link register save eliminated.
    sub    sp, sp, #24
    str    r0, [sp, #4]
    str    r1, [sp]
    mov    r3, #5
    str    r3, [sp, #16]
    add    r3, sp, #16
    str    r3, [sp, #12]
    add    r3, sp, #12
    str    r3, [sp, #20]
    mov    r3, #0
    mov    r0, r3
    add    sp, sp, #24
    @ sp needed
    bx    lr
    .size    main, .-main
    .ident    "GCC: (ctng-1.21.0-229g-FA) 4.9.3"
    .section    .note.GNU-stack,"",%progbits

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原文链接：https://blog.csdn.net/Hsu_smile/article/details/85050629