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> please someone give me an example .. like instruction counter under sparc
>
> i googled and found it can be done with trap #1,but i don't know how to
> do it.
>
> please me ,my brain is melting...
>

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> please someone give me an example .. like instruction counter under

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>
> i googled and found it can be done with trap #1,but i don't know how

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> do it.
>
> please me ,my brain is melting...
>

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> xtaci <xtaci@163.com> wrote:
> :>
> :> please me ,my brain is melting...
> :>
>
> : to make it clear:
> : in x86 environment ,i can use ptrace(PTRACE_SINGLESTEP, pid, 0, 0) to do
> : single stepping.
> : i need the same thing under solaris/SPARC.
> :
>
> What's wrong with same call on Sparc?
>
>

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> In Solaris you use the /proc file system in your "debugger" to control a
> process and its threads.
>
> --
> Norman Black
> Stony Brook Software
>
> "xtaci" <xtaci@163.com> wrote in message
> news:bo87l5$1lop$1@mail.cn99.com...
>
>
> sparc
>
>
> to
>
>
>

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> i dont quite cache up with you,maybe a short piece of C code would

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> Norman Black wrote:
control a[QUOTE][color=darkred]
>
> Can You Make it more clearer?
> i dont quite cache up with you,maybe a short piece of C code would

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>

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> man -s 4 proc
>
> I do not use C. I use Modula-2. My own compiler in fact.
>
> The proc file system has a host of functions for debugging a process.
> Read the man page. In short you would use the PCRUN code with the PRSTEP
> flag. This code is written to the appropriate "file" handle. Typically
> this is done on s specific LWP, but can be done to a process. In that
> case, whatever the current LWP was is acted upon.
>
> --
> Norman Black
> Stony Brook Software
>
> "xtaci" <xtaci@163.com> wrote in message
> news:bo9m6q$e5p$2@mail.cn99.com...

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> man -s 4 proc
>
> I do not use C. I use Modula-2. My own compiler in fact.
>
> The proc file system has a host of functions for debugging a process.
> Read the man page. In short you would use the PCRUN code with the PRSTEP
> flag. This code is written to the appropriate "file" handle. Typically
> this is done on s specific LWP, but can be done to a process. In that
> case, whatever the current LWP was is acted upon.
>
> --
> Norman Black
> Stony Brook Software

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> xtaci wrote: my code is
> i don't know what is wrong with my code?
> give me some hint please.
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <signal.h>
> #include <sys/types.h>
> #include <sys/procfs.h>
> #include <sys/wait.h>
> #include <fcntl.h>
> #include <unistd.h>
> #include <errno.h>
>
>
> int main(void)
> {
>
> long long counter = 0; /* machine instruction counter */
> int wait_val; /* child's return value */
> int pid; /* child's process id */
>
>
> long iov[2];
> int fd, temp = 0;
> char filename[512];
>
>
> puts("Please wait");
> switch (pid = fork()) {
> case -1:
> perror("fork");
> break;
> case 0: /* child process starts */
> sprintf(filename,"/proc/%d/ctl",getpid());
> iov[0] =1L; //PCSTOP
> iov[1] =0;
>
>
> if ((fd = open(filename, O_WRONLY)) == -1) {
> perror(filename);
> exit(1);
> }
> printf("%s",filename);
> write(fd,iov,2*sizeof(long));
>
> /*
> * let it stop first
> */
> execl("/bin/ls", "ls", NULL);
>
> break;
> /* child process ends */
>
>
>
>
>
>
> default:/* parent process starts */
> sprintf(filename,"/proc/%d/ctl",pid);
> iov[0] =5L;//PCRUN
> iov[1] =PRSTEP;
>
>
> if ((fd = open(filename, O_WRONLY)) == -1) {
> perror(filename);
> exit(1);
> }
> printf("%s",filename);
> write(fd,iov,2*sizeof(long));
> /* LET THE PROCESS RUN IN SINGLE STEP MODE */
>
> wait(&wait_val);
> /*
> * parent waits for child to stop at next
> * instruction (execl())
> */
> while(wait_val==SIGTRAP){
> counter++;
> /*
> * singlestep tracing and
> * release child
> * if unable call error.
> */
> write(fd,iov,2*sizeof(long));
> wait(&wait_val);
> /* wait for next instruction to complete */
> }
>
> /*
> * continue to stop, wait and release until
> */
> }
> printf("Number of machine instructions : %lld\n", counter);
> return 0;
> }
>

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> xtaci wrote:
>
> forget about last post.
>
> i forget to add poll in the while
> but it still very slow.
> it cost me 30seconds to finish a ls command.
>

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> but it still very slow.
> it cost me 30seconds to finish a ls command.

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> xtaci wrote:
>
> forget about last post.
>
> i forget to add poll in the while
> but it still very slow.
> it cost me 30seconds to finish a ls command.
>

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> Thank you very much.
>
> There is another problem with my program.
>
> lwpstatus_t pr_lwp; /* status of the representative lwp */
>
> when i access the pr_reg provided in the pr_lwp struct.(when the

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> stopped by the PRSTEP )
> the registers seems not to be changed ,it always remains the same.
> i'm sure i read the status file every time the program stopped.
>
> i donnot know what does 'the representative lwp' mean , is this the

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> reason the registers does not change? or i have to check some other
> lwp's status file?(the process being traced is never forked or

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>

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> xtaci wrote:
> I started to Use PCSENTRY to trace systemcall
> the program stopped at the right place
> but
>
> if (read(statfd, (void *) &s_stat, sizeof(pstatus_t)) !=

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> {
> perror("read_status(read)");
> return 1;
> }
>
>
> reported that i cannot read status file.
>
>
> #include <stdio.h>
> #include <stdlib.h>
> #include <signal.h>
> #include <sys/types.h>
> #define _STRUCTURED_PROC 1
> #include <sys/procfs.h>
> #include <sys/fault.h>
> #include <sys/syscall.h>
> #include <sys/wait.h>
> #include <fcntl.h>
> #include <unistd.h>
> #include <errno.h>
> #include <stropts.h>
> #include <poll.h>
>
>
> void handler_sigint();
> long counter=0;
> int main(void)
> {
>
> int pid;
>
>
> long iovp[2]; //parent process control
> int fd, temp = 0;
> char filename[512];
> char statfn[512];
> struct pollfd fds[1];
> pstatus_t s_stat;
> int statfd;
> int execcount=0;
> struct {
> long ctl;
> sysset_t evilsys;
> } pcsentry;
>
>
>
> puts("Please wait");
> switch (pid = fork()) {
> case -1:
> perror("fork");
> break;
> case 0: /* child process starts */
> /*
> * must be called in order to allow the
> * control over the child process
> */
> sleep(2);
> execl("./sparc-sh", "sparc-sh", NULL);
> /*
> * executes the program and causes
> * the child to stop and send a signal
> * to the parent, the parent can now
> * switch to PTRACE_SINGLESTEP
> */
> break;
> /* child process ends */
>
> default:/* parent process starts */
> sprintf(filename,"/proc/%d/ctl",pid);
> puts(filename);
>
> if ((fd = open(filename, O_WRONLY)) == -1) {
> perror(filename);
> exit(1);
> }
>
>
> iovp[0] = PCDSTOP;
> iovp[1] =0L;
> write(fd,iovp,2*sizeof(long));
>
>
>
> pcsentry.ctl=PCSENTRY;
> premptyset(&pcsentry.evilsys);
> praddset(&pcsentry.evilsys,SYS_fork);
> write(fd,&pcsentry,sizeof(pcsentry));
>
>
> fds[0].fd=fd;
>

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> poll(fds,1,0);
>
>
> sprintf(statfn,"/proc/%d/status",pid);
> if((statfd=open(statfn,O_RDONLY))==-1){
> perror(statfn);
> exit(1);
> }
>
>
> iovp[0]=PCRUN;
> iovp[1]=0L;
> write(fd,iovp,2*sizeof(long));
> while((fds[0].revents&POLLHUP)==0){
>
>
> if (read(statfd, (void *) &s_stat, sizeof(pstatus_t)) !=
> sizeof(pstatus_t))
> {
> perror("read_status(read)");
> return 1;
> }
>
> printf("%x\n",s_stat.pr_lwp.pr_why);
>
> if(s_stat.pr_lwp.pr_why==PR_SYSENTRY){
> puts("caught illegal syscall");
> exit(-1);
> }
>
> poll(fds,1,0);
>
> }
> close(fd);
> close(statfd);
> printf("no illegal instructions found : %ld\n", counter);
> return 0;
> }
> return 0;
> }
> void handler_sigint()
> {
> printf("%d\n",counter);
> exit(0);
> }
>

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> how to wake up the process after PCSENTRY or PCSEXIT caught

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> i PCRUN 0 it,but it doesn't work.
> i just want the process to continue to execute.
>

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