I wrote following C program:
#include <linux/module.h>
#include <linux/init.h>
static int param = 4096;
static unsigned long int addr = 0xffff88080984b000;
module_param(param, int, S_IRUGO);
module_param(addr, ulong, S_IRUGO);
static int test_init(void)
{
memset((void *)addr, 0, param);
return(-1);
}
static void test_exit(void)
{
}
module_init(test_init);
module_exit(test_exit);
MODULE_LICENSE("GPL");
Then, I compile it, and objdump -d test.o:
test.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <cleanup_module>:
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: e8 00 00 00 00 callq 9 <cleanup_module+0x9>
9: c9 leaveq
a: c3 retq
b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
0000000000000010 <init_module>:
10: 55 push %rbp
11: 48 89 e5 mov %rsp,%rbp
14: e8 00 00 00 00 callq 19 <init_module+0x9>
19: 48 63 15 00 00 00 00 movslq 0x0(%rip),%rdx # 20
<init_module+0x10>
20: 48 8b 3d 00 00 00 00 mov 0x0(%rip),%rdi # 27
<init_module+0x17>
27: 31 f6 xor %esi,%esi
29: e8 00 00 00 00 callq 2e <init_module+0x1e>
2e: b8 ff ff ff ff mov $0xffffffff,%eax
33: c9 leaveq
34: c3 retq
35: 90 nop
36: 90 nop
37: 90 nop
Can someone explain what the meaning of three "callq" instruction in objdump's
output, especially the arguments of "callq".
Thanks.
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