On Fri, Dec 05, 2014 at 01:32:35AM +0000, Jeff Haran wrote:
> $ cat atomic_read.c
>
> #include <asm/atomic.h>
> #include <asm/system.h>
>
> int samp_atomic_read(atomic_t *v)
> {
> int val;
>
> val = atomic_read(v);
> return val;
> }
I couldn't get it to build with the #inclue <asm/system.h>, but it built
when I removed it.
> I dump the resultant .ko, I get this:
>
> > objdump -S -M intel atomic_read.ko
>
> atomic_read.ko: file format elf64-x86-64
>
>
> Disassembly of section .text:
>
> 0000000000000000 <samp_atomic_read>:
> #include <asm/atomic.h>
> #include <asm/system.h>
>
> int samp_atomic_read(atomic_t *v)
> {
> 0: 55 push rbp
> 1: 48 89 e5 mov rbp,rsp
> 4: e8 00 00 00 00 call 9 <samp_atomic_read+0x9>
> *
> * Atomically reads the value of @v.
> */
> static inline int atomic_read(const atomic_t *v)
> {
> return v->counter;
> 9: 8b 07 mov eax,DWORD PTR [rdi]
> int val;
>
> val = atomic_read(v);
> return val;
> }
> b: c9 leave
> c: c3 ret
> d: 90 nop
> e: 90 nop
> f: 90 nop
>
My ouput differs:
john@vega:~/foo$ objdump -S -M intel atomic_read.ko
atomic_read.ko: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <samp_atomic_read>:
0: 55 push rbp
1: 8b 07 mov eax,DWORD PTR [rdi]
3: 48 89 e5 mov rbp,rsp
6: 5d pop rbp
7: c3 ret
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