[src/trunk]: src/tests/kernel/arch/amd64 Extend dbregs_dr*_trap_variable test...

[kamil <kamil%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/cf4c4702cf9e
branches:  trunk
changeset: 821854:cf4c4702cf9e
user:      kamil <kamil%NetBSD.org@localhost>
date:      Sun Feb 19 23:58:30 2017 +0000

description:
Extend dbregs_dr*_trap_variable tests to 1-2-4 byte traps in arch/amd64

Replace the following tests:
 - dbregs_dr0_trap_variable
 - dbregs_dr1_trap_variable
 - dbregs_dr2_trap_variable
 - dbregs_dr3_trap_variable

With new ones:
 - dbregs_dr0_trap_variable_writeonly_byte
 - dbregs_dr1_trap_variable_writeonly_byte
 - dbregs_dr2_trap_variable_writeonly_byte
 - dbregs_dr3_trap_variable_writeonly_byte
 - dbregs_dr0_trap_variable_writeonly_2bytes
 - dbregs_dr1_trap_variable_writeonly_2bytes
 - dbregs_dr2_trap_variable_writeonly_2bytes
 - dbregs_dr3_trap_variable_writeonly_2bytes
 - dbregs_dr0_trap_variable_writeonly_4bytes
 - dbregs_dr1_trap_variable_writeonly_4bytes
 - dbregs_dr2_trap_variable_writeonly_4bytes
 - dbregs_dr3_trap_variable_writeonly_4bytes

All tests pass with my local implementation of debug registers. Once the
interface will be verified, I will prepare it for commit to HEAD.

Sponsored by <The NetBSD Foundation>

diffstat:

 tests/kernel/arch/amd64/t_ptrace_wait.c |  1098 ++++++++++++++++++++++++++++++-
 1 files changed, 1076 insertions(+), 22 deletions(-)

diffs (truncated from 1163 to 300 lines):

diff -r 1de643e2e3e9 -r cf4c4702cf9e tests/kernel/arch/amd64/t_ptrace_wait.c
--- a/tests/kernel/arch/amd64/t_ptrace_wait.c   Sun Feb 19 22:09:29 2017 +0000
+++ b/tests/kernel/arch/amd64/t_ptrace_wait.c   Sun Feb 19 23:58:30 2017 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_ptrace_wait.c,v 1.15 2017/02/19 22:09:29 kamil Exp $ */
+/*     $NetBSD: t_ptrace_wait.c,v 1.16 2017/02/19 23:58:30 kamil Exp $ */
 
 /*-
  * Copyright (c) 2016 The NetBSD Foundation, Inc.
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_ptrace_wait.c,v 1.15 2017/02/19 22:09:29 kamil Exp $");
+__RCSID("$NetBSD: t_ptrace_wait.c,v 1.16 2017/02/19 23:58:30 kamil Exp $");
 
 #include <sys/param.h>
 #include <sys/types.h>
@@ -1307,14 +1307,1055 @@
 #endif
 
 #if defined(HAVE_DBREGS)
-ATF_TC(dbregs_dr0_trap_variable);
-ATF_TC_HEAD(dbregs_dr0_trap_variable, tc)
+ATF_TC(dbregs_dr0_trap_variable_writeonly_byte);
+ATF_TC_HEAD(dbregs_dr0_trap_variable_writeonly_byte, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Verify that setting trap with DR0 triggers SIGTRAP "
+           "(break on data writes only and 1 byte mode)");
+}
+
+ATF_TC_BODY(dbregs_dr0_trap_variable_writeonly_byte, tc)
+{
+       const int exitval = 5;
+       const int sigval = SIGSTOP;
+       pid_t child, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+       int status;
+#endif
+       struct dbreg r1;
+       struct dbreg r2;
+       /* Number of available CPU Debug Registers on AMD64 */
+       const size_t len = 16;
+       size_t i;
+       volatile int watchme;
+       union u dr7;
+
+       struct ptrace_siginfo info;
+       memset(&info, 0, sizeof(info));
+
+       dr7.raw = 0;
+       dr7.bits.global_dr0_breakpoint = 1;
+       dr7.bits.condition_dr0 = 3;     /* 0b11 -- break on data write&read */
+       dr7.bits.len_dr0 = 0;           /* 0b00 -- 1 byte */
+
+       printf("Assert that known number of Debug Registers (%zu) is valid\n",
+           len);
+       ATF_REQUIRE_EQ(__arraycount(r1.dr), len);
+       ATF_REQUIRE_EQ(__arraycount(r2.dr), len);
+
+       printf("Before forking process PID=%d\n", getpid());
+       ATF_REQUIRE((child = fork()) != -1);
+       if (child == 0) {
+               printf("Before calling PT_TRACE_ME from child %d\n", getpid());
+               FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
+
+               printf("Before raising %s from child\n", strsignal(sigval));
+               FORKEE_ASSERT(raise(sigval) == 0);
+
+               watchme = 1;
+
+               printf("Before raising %s from child\n", strsignal(sigval));
+               FORKEE_ASSERT(raise(sigval) == 0);
+
+               printf("Before exiting of the child process\n");
+               _exit(exitval);
+       }
+       printf("Parent process PID=%d, child's PID=%d\n", getpid(), child);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, sigval);
+
+       printf("Call GETDBREGS for the child process (r1)\n");
+       ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);
+
+       printf("State of the debug registers (r1):\n");
+       for (i = 0; i < __arraycount(r1.dr); i++)
+               printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
+
+       r1.dr[0] = (long)(intptr_t)&watchme;
+       printf("Set DR0 (r1.dr[0]) to new value %#lx\n", r1.dr[0]);
+
+       r1.dr[7] = dr7.raw;
+       printf("Set DR7 (r1.dr[7]) to new value %#lx\n", r1.dr[7]);
+
+       printf("New state of the debug registers (r1):\n");
+       for (i = 0; i < __arraycount(r1.dr); i++)
+               printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
+
+       printf("Call SETDBREGS for the child process (r1)\n");
+       ATF_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);
+
+       printf("Call CONTINUE for the child process\n");
+       ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, SIGTRAP);
+
+       printf("Before calling ptrace(2) with PT_GET_SIGINFO for child\n");
+       ATF_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info, sizeof(info)) != -1);
+
+       printf("Signal traced to lwpid=%d\n", info.psi_lwpid);
+       printf("Signal properties: si_signo=%#x si_code=%#x si_errno=%#x\n",
+           info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
+           info.psi_siginfo.si_errno);
+
+       printf("Before checking siginfo_t\n");
+       ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, SIGTRAP);
+       ATF_REQUIRE_EQ(info.psi_siginfo.si_code, TRAP_DBREG);
+
+       printf("Call CONTINUE for the child process\n");
+       ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, sigval);
+
+       printf("Call GETDBREGS for the child process (r2)\n");
+       ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, 0) != -1);
+
+       printf("Assert that (r1) and (r2) are the same\n");
+       ATF_REQUIRE(memcmp(&r1, &r2, len) == 0);
+
+       printf("Before resuming the child process where it left off and "
+           "without signal to be sent\n");
+       ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_exited(status, exitval);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
+}
+#endif
+
+#if defined(HAVE_DBREGS)
+ATF_TC(dbregs_dr1_trap_variable_writeonly_byte);
+ATF_TC_HEAD(dbregs_dr1_trap_variable_writeonly_byte, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Verify that setting trap with DR1 triggers SIGTRAP "
+           "(break on data writes only and 1 byte mode)");
+}
+
+ATF_TC_BODY(dbregs_dr1_trap_variable_writeonly_byte, tc)
+{
+       const int exitval = 5;
+       const int sigval = SIGSTOP;
+       pid_t child, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+       int status;
+#endif
+       struct dbreg r1;
+       struct dbreg r2;
+       /* Number of available CPU Debug Registers on AMD64 */
+       const size_t len = 16;
+       size_t i;
+       volatile int watchme;
+       union u dr7;
+
+       struct ptrace_siginfo info;
+       memset(&info, 0, sizeof(info));
+
+       dr7.raw = 0;
+       dr7.bits.global_dr1_breakpoint = 1;
+       dr7.bits.condition_dr1 = 3;     /* 0b11 -- break on data write&read */
+       dr7.bits.len_dr1 = 0;           /* 0b00 -- 1 byte */
+
+       printf("Assert that known number of Debug Registers (%zu) is valid\n",
+           len);
+       ATF_REQUIRE_EQ(__arraycount(r1.dr), len);
+       ATF_REQUIRE_EQ(__arraycount(r2.dr), len);
+
+       printf("Before forking process PID=%d\n", getpid());
+       ATF_REQUIRE((child = fork()) != -1);
+       if (child == 0) {
+               printf("Before calling PT_TRACE_ME from child %d\n", getpid());
+               FORKEE_ASSERT(ptrace(PT_TRACE_ME, 0, NULL, 0) != -1);
+
+               printf("Before raising %s from child\n", strsignal(sigval));
+               FORKEE_ASSERT(raise(sigval) == 0);
+
+               watchme = 1;
+
+               printf("Before raising %s from child\n", strsignal(sigval));
+               FORKEE_ASSERT(raise(sigval) == 0);
+
+               printf("Before exiting of the child process\n");
+               _exit(exitval);
+       }
+       printf("Parent process PID=%d, child's PID=%d\n", getpid(), child);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, sigval);
+
+       printf("Call GETDBREGS for the child process (r1)\n");
+       ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r1, 0) != -1);
+
+       printf("State of the debug registers (r1):\n");
+       for (i = 0; i < __arraycount(r1.dr); i++)
+               printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
+
+       r1.dr[1] = (long)(intptr_t)&watchme;
+       printf("Set DR1 (r1.dr[1]) to new value %#lx\n", r1.dr[1]);
+
+       r1.dr[7] = dr7.raw;
+       printf("Set DR7 (r1.dr[7]) to new value %#lx\n", r1.dr[7]);
+
+       printf("New state of the debug registers (r1):\n");
+       for (i = 0; i < __arraycount(r1.dr); i++)
+               printf("r1[%zu]=%#lx\n", i, r1.dr[i]);
+
+       printf("Call SETDBREGS for the child process (r1)\n");
+       ATF_REQUIRE(ptrace(PT_SETDBREGS, child, &r1, 0) != -1);
+
+       printf("Call CONTINUE for the child process\n");
+       ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, SIGTRAP);
+
+       printf("Before calling ptrace(2) with PT_GET_SIGINFO for child\n");
+       ATF_REQUIRE(ptrace(PT_GET_SIGINFO, child, &info, sizeof(info)) != -1);
+
+       printf("Signal traced to lwpid=%d\n", info.psi_lwpid);
+       printf("Signal properties: si_signo=%#x si_code=%#x si_errno=%#x\n",
+           info.psi_siginfo.si_signo, info.psi_siginfo.si_code,
+           info.psi_siginfo.si_errno);
+
+       printf("Before checking siginfo_t\n");
+       ATF_REQUIRE_EQ(info.psi_siginfo.si_signo, SIGTRAP);
+       ATF_REQUIRE_EQ(info.psi_siginfo.si_code, TRAP_DBREG);
+
+       printf("Call CONTINUE for the child process\n");
+       ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_stopped(status, sigval);
+
+       printf("Call GETDBREGS for the child process (r2)\n");
+       ATF_REQUIRE(ptrace(PT_GETDBREGS, child, &r2, 0) != -1);
+
+       printf("Assert that (r1) and (r2) are the same\n");
+       ATF_REQUIRE(memcmp(&r1, &r2, len) == 0);
+
+       printf("Before resuming the child process where it left off and "
+           "without signal to be sent\n");
+       ATF_REQUIRE(ptrace(PT_CONTINUE, child, (void *)1, 0) != -1);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_SUCCESS(wpid = TWAIT_GENERIC(child, &status, 0), child);
+
+       validate_status_exited(status, exitval);
+
+       printf("Before calling %s() for the child\n", TWAIT_FNAME);
+       TWAIT_REQUIRE_FAILURE(ECHILD, wpid = TWAIT_GENERIC(child, &status, 0));
+}
+#endif
+
+#if defined(HAVE_DBREGS)
+ATF_TC(dbregs_dr2_trap_variable_writeonly_byte);
+ATF_TC_HEAD(dbregs_dr2_trap_variable_writeonly_byte, tc)
+{
+       atf_tc_set_md_var(tc, "descr",
+           "Verify that setting trap with DR2 triggers SIGTRAP "
+           "(break on data writes only and 1 byte mode)");
+}
+
+ATF_TC_BODY(dbregs_dr2_trap_variable_writeonly_byte, tc)
+{
+       const int exitval = 5;
+       const int sigval = SIGSTOP;
+       pid_t child, wpid;
+#if defined(TWAIT_HAVE_STATUS)
+       int status;
+#endif