c)lets say for a program a.c i use gcc -S a.c ...do we have some other
command to generate
somewhat more clear assembly code, may be with some comments in english
Not sure if this is of any help, but the kernel build system (no idea
how to do this for user space programs) offers to generate a listing
that interleaves the c code into assembly making it better readable. So
if your function is e.g. in kernel/rtmutex.c you could do the following:
andi@PC63:~/working_git/linux-next$ make kernel/rtmutex.lst
SYSHDR arch/x86/syscalls/../include/generated/uapi/asm/unistd_32.h
SYSHDR arch/x86/syscalls/../include/generated/uapi/asm/unistd_64.h
<SNIP>
HOSTCC scripts/asn1_compiler
MKLST kernel/rtmutex.lst
No System.map
andi@PC63:~/working_git/linux-next$
here is one function from the resulting rtmutex.lst file:
static void fixup_rt_mutex_waiters(struct rt_mutex *lock)
{
70: e8 00 00 00 00 callq 75 <fixup_rt_mutex_waiters+0x5>
71: R_X86_64_PC32
__fentry__+0xfffffffffffffffc
75: 55 push %rbp
76: 48 ff 05 00 00 00 00 incq 0x0(%rip) # 7d
<fixup_rt_mutex_waiters+0xd>
79: R_X86_64_PC32 .bss+0x6fc
7d: 48 89 e5 mov %rsp,%rbp
80: 53 push %rbx
81: 48 89 fb mov %rdi,%rbx
if (!rt_mutex_has_waiters(lock))
84: e8 8e ff ff ff callq 17 <rt_mutex_has_waiters>
89: 48 ff 05 00 00 00 00 incq 0x0(%rip) # 90
<fixup_rt_mutex_waiters+0x20>
8c: R_X86_64_PC32 .bss+0x704
90: 85 c0 test %eax,%eax
92: 75 0c jne a0 <fixup_rt_mutex_waiters+0x30>
}
btw. you can for example generate the pre-processed code in the same way:
andi@PC63:~/working_git/linux-next$ make kernel/rtmutex.i
or the assembly code:
andi@PC63:~/working_git/linux-next$ make kernel/rtmutex.s
this is especially helpful, as it also contains a list of all the flags
used for compiling.
regards,
andi
Any kind of help in understanding this will be appreciated ..
Thanks
Nidhi
--
Thanks & Regards
Nidhi Mittal Hada
http://nidhi-searchingmyself.blogspot.com/
_______________________________________________
Kernelnewbies mailing list
Kernelnewbies@kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
_______________________________________________
Kernelnewbies mailing list
Kernelnewbies@kernelnewbies.org
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies