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/
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