Re: Can't find macro SAVE_ALL — Linux Kernel Newbies

2012/5/18 HWSW Development <hwsw.development@xxxxxxxxxxxxxx>

The macro is defined in arch/x86/include/asm/calling.h

Regards,
Rooney

2012/5/18 Bill Traynor <wmat@xxxxxxxxxxxxxx>

On Thu, May 17, 2012 at 10:37 PM, 王哲 <wangzhe5004@xxxxxxxxx> wrote:

2012/5/17 Javier Martinez Canillas <martinez.javier@xxxxxxxxx>

On Thu, May 17, 2012 at 3:59 PM, 王哲 <wangzhe5004@xxxxxxxxx> wrote:
> Hi all:
>     i am a kernelnewbies.during studying the linux system call,and
> analysis the following code (linux kernel 2.6.38)
>
> 529ENTRY(system_call)
> 530 RING0_INT_FRAME # can't unwind into user space anyway
> 531 pushl %eax # save orig_eax
> 532 CFI_ADJUST_CFA_OFFSET 4
> 533 SAVE_ALL
> 534 GET_THREAD_INFO(%ebp)
> 535 # system call tracing in operation / emulation
> 536 testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%ebp)
> 537 jnz syscall_trace_entry
> 538 cmpl $(nr_syscalls), %eax
> 539 jae syscall_badsys
> 540syscall_call:
> 541 call *sys_call_table(,%eax,4)
> 542 movl %eax,PT_EAX(%esp) # store the return value
>
> Question:
>            i want to see what the SAVE_ALL have done.and can't find the
> Macro SAVE_ALL
> if anyone knows please help

>
>          Thanks
>

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> Kernelnewbies mailing list
> Kernelnewbies@xxxxxxxxxxxxxxxxx
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>

http://lxr.free-electrons.com/ident?i=SAVE_ALL

   Thank you Javier Martinez Canillas for reply!
   but the rearch result :
   Defined as a preprocessor macro in:
arch/cris/include/arch-v32/arch/irq.h, line 32

arch/cris/include/arch-v10/arch/irq.h, line 85
arch/sparc/include/asm/asmmacro.h, line 27

    is not in x86 Architecture.

Couldn't you find it by doing something like this? In your kernel source tree:

$cd arch/x86

$grep -ircl ".macro SAVE_ALL" *

Best regards,

--
Javier Martínez Canillas
(+34) 682 39 81 69
Barcelona, Spain

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     Thanks for all.

   I have sloved the problem. this macro is written with assembly ，not c .
        No wonder that i don't search it out in the lxr.linux.no

arch/x86/kernel/entry_32.s

192 .macro SAVE_ALL
193         cld
194         PUSH_GS
195         pushl_cfi %fs
196         /*CFI_REL_OFFSET fs, 0;*/
197         pushl_cfi %es
198         /*CFI_REL_OFFSET es, 0;*/
199         pushl_cfi %ds
200         /*CFI_REL_OFFSET ds, 0;*/
201         pushl_cfi %eax
202         CFI_REL_OFFSET eax, 0
203         pushl_cfi %ebp
204         CFI_REL_OFFSET ebp, 0
205         pushl_cfi %edi
206         CFI_REL_OFFSET edi, 0
207         pushl_cfi %esi
208         CFI_REL_OFFSET esi, 0
209         pushl_cfi %edx
210         CFI_REL_OFFSET edx, 0
211         pushl_cfi %ecx
212         CFI_REL_OFFSET ecx, 0
213         pushl_cfi %ebx
214         CFI_REL_OFFSET ebx, 0
215         movl $(__USER_DS), %edx
216         movl %edx, %ds
217         movl %edx, %es
218         movl $(__KERNEL_PERCPU), %edx
219         movl %edx, %fs
220         SET_KERNEL_GS %edx
221 .endm