mirror of
https://github.com/tobast/libunwind-eh_elf.git
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Use SIGUSR1/SIGUSR2 to start/stop backtrace() verification for trace_mode == TRIGGER.
(Logical change 1.56)
This commit is contained in:
mostang.com!davidm
parent
d6a0aa7059
commit
64b4ac37da
1 changed files with 61 additions and 48 deletions
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@ -34,12 +34,8 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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#include <sys/ptrace.h>
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#include <sys/wait.h>
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#ifdef __ia64__
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# include <asm/ptrace_offsets.h>
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#endif
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int nerrors;
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int verbose = 1;
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int verbose;
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enum
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{
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@ -58,7 +54,7 @@ static struct UPT_info *ui;
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void
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do_backtrace (pid_t target_pid)
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{
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int ret;
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int n = 0, ret;
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unw_proc_info_t pi;
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unw_word_t ip, sp;
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unw_cursor_t c;
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@ -70,33 +66,48 @@ do_backtrace (pid_t target_pid)
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do
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{
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unw_get_reg (&c, UNW_REG_IP, &ip);
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unw_get_reg (&c, UNW_REG_SP, &sp);
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if ((ret = unw_get_reg (&c, UNW_REG_IP, &ip)) < 0
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|| (ret = unw_get_reg (&c, UNW_REG_SP, &sp)) < 0)
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panic ("unw_get_reg/unw_get_proc_name() failed: ret=%d\n", ret);
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unw_get_proc_name (&c, buf, sizeof (buf), NULL);
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printf ("%016lx %-32s (sp=%016lx)\n", (long) ip, buf, (long) sp);
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if (verbose)
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printf ("%016lx %-32s (sp=%016lx)\n", (long) ip, buf, (long) sp);
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unw_get_proc_info (&c, &pi);
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printf ("\tproc=%016lx-%016lx\n\thandler=%lx lsda=%lx",
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(long) pi.start_ip, (long) pi.end_ip,
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(long) pi.handler, (long) pi.lsda);
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if ((ret = unw_get_proc_info (&c, &pi)) < 0)
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panic ("unw_get_proc_info() failed: ret=%d\n", ret);
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else if (verbose)
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printf ("\tproc=%016lx-%016lx\n\thandler=%lx lsda=%lx",
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(long) pi.start_ip, (long) pi.end_ip,
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(long) pi.handler, (long) pi.lsda);
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#if UNW_TARGET_IA64
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{
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unw_word_t bsp;
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unw_get_reg (&c, UNW_IA64_BSP, &bsp);
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printf (" bsp=%lx", bsp);
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if ((ret = unw_get_reg (&c, UNW_IA64_BSP, &bsp)) < 0)
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panic ("unw_get_reg() failed: ret=%d\n", ret);
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else if (verbose)
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printf (" bsp=%lx", bsp);
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}
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#endif
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printf ("\n");
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if (verbose)
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printf ("\n");
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ret = unw_step (&c);
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if (ret < 0)
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{
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unw_get_reg (&c, UNW_REG_IP, &ip);
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printf ("FAILURE: unw_step() returned %d for ip=%lx\n",
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ret, (long) ip);
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panic ("FAILURE: unw_step() returned %d for ip=%lx\n",
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ret, (long) ip);
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}
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if (++n > 32)
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{
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/* guard against bad unwind info in old libraries... */
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panic ("too deeply nested---assuming bogus unwind\n");
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break;
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}
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}
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while (ret > 0);
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@ -104,13 +115,14 @@ do_backtrace (pid_t target_pid)
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if (ret < 0)
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panic ("unwind failed with ret=%d\n", ret);
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printf ("================\n\n");
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if (verbose)
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printf ("================\n\n");
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}
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int
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main (int argc, char **argv)
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{
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int syscall_number, status, pid, optind = 1, state = 1;
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int status, pid, pending_sig, optind = 1, state = 1;
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pid_t target_pid;
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as = unw_create_addr_space (&_UPT_accessors, 0);
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@ -122,7 +134,6 @@ main (int argc, char **argv)
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char *args[] = { "self", "/bin/ls", "/usr", NULL };
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/* automated test case */
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verbose = 0;
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argv = args;
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}
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else if (argc > 1)
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@ -163,6 +174,7 @@ main (int argc, char **argv)
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panic ("wait4() failed (errno=%d)\n", errno);
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}
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pending_sig = 0;
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if (WIFSIGNALED (status) || WIFEXITED (status)
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|| (WIFSTOPPED (status) && WSTOPSIG (status) != SIGTRAP))
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{
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@ -175,40 +187,41 @@ main (int argc, char **argv)
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else if (WIFSIGNALED (status))
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panic ("child terminated by signal %d\n", WTERMSIG (status));
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else
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panic ("child got signal %d\n", WSTOPSIG (status));
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}
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if (trace_mode == SYSCALL || trace_mode == TRIGGER)
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{
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if (!state)
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{
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if (trace_mode == SYSCALL)
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do_backtrace (target_pid);
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}
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else
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{
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errno = 0;
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syscall_number = ptrace (PTRACE_PEEKUSER, target_pid, PT_R15, 0);
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if (errno != 0)
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syscall_number = 0;
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printf ("syscall = %d\n", syscall_number);
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if (trace_mode == TRIGGER && syscall_number == -1)
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pending_sig = WSTOPSIG (status);
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if (trace_mode == TRIGGER)
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{
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trace_mode = INSTRUCTION;
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goto do_insn;
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if (WSTOPSIG (status) == SIGUSR1)
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state = 0;
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else if (WSTOPSIG (status) == SIGUSR2)
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state = 1;
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}
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}
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state ^= 1;
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ptrace (PTRACE_SYSCALL, target_pid, 0, 0); /* continue */
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}
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else
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switch (trace_mode)
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{
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case TRIGGER:
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if (state)
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ptrace (PTRACE_CONT, target_pid, 0, 0);
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else
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{
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do_backtrace (target_pid);
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ptrace (PTRACE_SINGLESTEP, target_pid, 0, pending_sig);
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}
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break;
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case SYSCALL:
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if (!state)
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do_backtrace (target_pid);
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state ^= 1;
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ptrace (PTRACE_SYSCALL, target_pid, 0, pending_sig);
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break;
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case INSTRUCTION:
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do_backtrace (target_pid);
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do_insn:
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ptrace (PTRACE_SINGLESTEP, target_pid, 0, 0); /* continue */
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ptrace (PTRACE_SINGLESTEP, target_pid, 0, pending_sig);
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break;
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}
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}
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