On Mon, Mar 21, 2011 at 08:32:04PM +0300, Chagin Dmitry wrote: > On Mon, Mar 21, 2011 at 05:36:13PM +0800, Xingxing Pan wrote: > > 2011/3/21 Chagin Dmitry <[email protected]>: > > >> powerfull script. > > >> > > >> Xingxing Pan > > > > > > hmm, which script? I think enough amd64, i386 and amd64/ia32. > > > > > > I suggest to write a example before continuing the conversation > > > about the GSoC. For example (bcopy || bzero) && cpu_switch. > > > Is it ok for you? > > > > > > -- > > > Have fun! > > > chd > > > > > > > Hi Chargin, > > > > Thank you for your reply. > > The followings shows how I try to add DWARF for bcopy. > > > > --- ../8.2.0/sys/i386/include/asm.h 2011-03-21 14:35:56.111973722 +0800 > > +++ asm.h 2011-03-21 15:25:31.564636162 +0800 > > @@ -71,7 +71,7 @@ > > > > #define _ENTRY(x) _START_ENTRY; \ > > .globl CNAME(x); .type CNAME(x),@function; CNAME(x): > > -#define END(x) .size x, . - x > > +#define END(x) .cfi_endproc; .size x, . - x > > > > #ifdef PROF > > #define ALTENTRY(x) _ENTRY(x); \ > > @@ -80,9 +80,10 @@ > > popl %ebp; \ > > jmp 9f > > #define ENTRY(x) _ENTRY(x); \ > > - pushl %ebp; movl %esp,%ebp; \ > > + .cfi_startproc; \ > > + pushl %ebp; .cfi_adjust_cfa_offset 4; movl > > %esp,%ebp; .cfi_def_cfa_register %ebp; \ > > call PIC_PLT(HIDENAME(mcount)); \ > > - popl %ebp; \ > > + popl %ebp; .cfi_def_cfa %esp, 4; \ > > > > --- bcopy.S 2011-03-21 15:51:26.804203809 +0800 > > +++ ../8.2.0/lib/libc/i386/string/bcopy.S 2011-03-21 > > 14:28:15.023069890 +0800 > > @@ -51,9 +51,7 @@ ENTRY(bcopy) > > #endif > > #endif > > pushl %esi > > - .cfi_adjust_cfa_offset 4; > > pushl %edi > > - .cfi_adjust_cfa_offset 4; > > #if defined(MEMCOPY) || defined(MEMMOVE) > > movl 12(%esp),%edi > > movl 16(%esp),%esi > > @@ -77,9 +75,7 @@ ENTRY(bcopy) > > rep > > movsb > > popl %edi > > - .cfi_adjust_cfa_offset -4; > > popl %esi > > - .cfi_adjust_cfa_offset -4; > > ret > > 1: > > addl %ecx,%edi /* copy backwards. */ > > @@ -98,9 +94,7 @@ ENTRY(bcopy) > > rep > > movsl > > popl %edi > > - .cfi_adjust_cfa_offset -4; > > popl %esi > > - .cfi_adjust_cfa_offset -4; > > cld > > ret > > #ifdef MEMCOPY > > > > But I don't know how to add DWARF for cpu_switch, because I have no > > idea about the circumstance when we need to backtrace through this > > function. Suppose there's a cpu switch like this, > > threadA->kernel->threadB. Then should the expected backtrace has the > > following result? > > > > threadB's stack > > kernel's stack > > threadA's stack > > > hmm, ok. good, avoid cpu_switch. > First of all, please, read style(9) man page. > In the second, evaluate the proposed plan (discussed with kib@): > > 1) Annotate libc, msun, rtld, libthr (you) 1a) Develop and implement a testing plan to verify the implementation. 1b) consider doing full register tracking for assembler code.
> 2) vdso (I'm) > 3) Annotate signal trampolines (you, after vdso) > > And i'm going to understand what I need to do to start GSoC for you. > Thanks! > > > -- > Have fun! > chd
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