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/* Testing s390x PTRACE_SINGLEBLOCK ptrace request.
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Copyright (C) 2017-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <elf.h>
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#include <support/xunistd.h>
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#include <support/check.h>
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#include <string.h>
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#include <errno.h>
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/* Ensure that we use the PTRACE_SINGLEBLOCK definition from glibc ptrace.h
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in tracer_func. We need the kernel ptrace.h for structs ptrace_area
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and gregset_t. */
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#include <sys/ptrace.h>
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static const enum __ptrace_request req_singleblock = PTRACE_SINGLEBLOCK;
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#include <asm/ptrace.h>
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static void
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tracee_func (int pid)
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{
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/* Dump the mapping information for manual inspection of the printed
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tracee addresses. */
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char str[80];
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sprintf (str, "cat /proc/%d/maps", pid);
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puts (str);
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system (str);
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fflush (stdout);
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TEST_VERIFY_EXIT (ptrace (PTRACE_TRACEME) == 0);
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/* Stop tracee. Afterwards the tracer_func can operate. */
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kill (pid, SIGSTOP);
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puts ("The PTRACE_SINGLEBLOCK of the tracer will stop after: "
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"brasl %r14,<puts@plt>!");
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}
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static void
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tracer_func (int pid)
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{
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unsigned long last_break;
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ptrace_area parea;
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gregset_t regs;
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struct iovec parea2;
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gregset_t regs2;
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int status;
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int ret;
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#define MAX_CHARS_IN_BUF 4096
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char buf[MAX_CHARS_IN_BUF + 1];
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size_t buf_count;
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while (1)
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{
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/* Wait for the tracee to be stopped or exited. */
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wait (&status);
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if (WIFEXITED (status))
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break;
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/* Get information about tracee: gprs, last breaking address. */
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parea.len = sizeof (regs);
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parea.process_addr = (unsigned long) ®s;
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parea.kernel_addr = 0;
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TEST_VERIFY_EXIT (ptrace (PTRACE_PEEKUSR_AREA, pid, &parea) == 0);
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TEST_VERIFY_EXIT (ptrace (PTRACE_GET_LAST_BREAK, pid, NULL, &last_break)
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== 0);
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parea2.iov_len = sizeof (regs2);
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parea2.iov_base = ®s;;
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TEST_VERIFY_EXIT (ptrace (PTRACE_GETREGSET, pid, NT_PRSTATUS, &parea2)
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== 0);
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TEST_VERIFY_EXIT (parea2.iov_len == sizeof (regs2));
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/* Test if gprs obtained by PTRACE_PEEKUSR_AREA and PTRACE_GETREGESET
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have the same values. */
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TEST_VERIFY_EXIT (memcmp (®s, ®s2, sizeof (regs)) == 0);
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printf ("child IA: %p last_break: %p\n",
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(void *) regs[1], (void *) last_break);
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/* Execute tracee until next taken branch.
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Note:
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Before the commit which introduced this testcase,
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<glibc>/sysdeps/unix/sysv/linux/s390/sys/ptrace.h
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uses ptrace-request 12 for PTRACE_GETREGS,
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but <kernel>/include/uapi/linux/ptrace.h
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uses 12 for PTRACE_SINGLEBLOCK.
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The s390 kernel has no support for PTRACE_GETREGS!
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Thus glibc ptrace.h is adjusted to match kernel ptrace.h.
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The glibc sys/ptrace.h header contains the identifier
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PTRACE_SINGLEBLOCK in enum __ptrace_request. In contrast, the kernel
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asm/ptrace.h header defines PTRACE_SINGLEBLOCK.
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This test ensures, that PTRACE_SINGLEBLOCK defined in glibc
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works as expected. If the kernel would interpret it as
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PTRACE_GETREGS, then the tracee will not make any progress
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and this testcase will time out or the ptrace call will fail with
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different errors. */
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/* Ptrace request 12 is first done with data argument pointing to
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a buffer:
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-If request 12 is interpreted as PTRACE_GETREGS, it will store the regs
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to buffer without an error.
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-If request 12 is interpreted as PTRACE_SINGLEBLOCK, it will fail
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as data argument is used as signal-number and the address of
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buf is no valid signal.
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-If request 12 is not implemented, it will also fail.
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Here the test expects that the buffer is untouched and an error is
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returned. */
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memset (buf, 'a', MAX_CHARS_IN_BUF);
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ret = ptrace (req_singleblock, pid, NULL, buf);
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buf [MAX_CHARS_IN_BUF] = '\0';
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buf_count = strspn (buf, "a");
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TEST_VERIFY_EXIT (buf_count == MAX_CHARS_IN_BUF);
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TEST_VERIFY_EXIT (ret == -1);
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/* If request 12 is interpreted as PTRACE_GETREGS, the first ptrace
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call will touch the buffer which is detected by this test. */
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errno = 0;
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ret = ptrace (req_singleblock, pid, NULL, NULL);
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if (ret == 0)
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{
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/* The kernel has support for PTRACE_SINGLEBLOCK ptrace request. */
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TEST_VERIFY_EXIT (errno == 0);
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}
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else
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{
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/* The kernel (< 3.15) has no support for PTRACE_SINGLEBLOCK ptrace
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request. */
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TEST_VERIFY_EXIT (errno == EIO);
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TEST_VERIFY_EXIT (ret == -1);
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/* Just continue tracee until it exits normally. */
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TEST_VERIFY_EXIT (ptrace (PTRACE_CONT, pid, NULL, NULL) == 0);
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}
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}
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}
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static int
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do_test (void)
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{
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int pid;
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pid = xfork ();
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if (pid)
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tracer_func (pid);
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else
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tracee_func (getpid ());
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return EXIT_SUCCESS;
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}
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#include <support/test-driver.c>
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