gdb/testsuite/

	* gdb.base/disp-step-fork.c: New.
	* gdb.base/disp-step-syscall.exp: New.
	* gdb.base/disp-step-vfork.c: New.

1 files changed, 138 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.base/disp-step-syscall.exp b/gdb/testsuite/gdb.base/disp-step-syscall.exp
new file mode 100644
index 0000000..a84ca29
--- /dev/null
+++ b/gdb/testsuite/gdb.base/disp-step-syscall.exp
@@ -0,0 +1,138 @@
+# This testcase is part of GDB, the GNU debugger.
+
+# Copyright 2011 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+if { ![support_displaced_stepping] } {
+    unsupported "displaced stepping"
+    return -1
+}
+
+set syscall_insn ""
+
+# Define the syscall instruction for each target.
+
+if { [istarget "i\[34567\]86-*-linux*"] || [istarget "x86_64-*-linux*"] } {
+    set syscall_insn "(int|syscall|sysenter)"
+} else {
+    return -1
+}
+
+proc disp_step_cross_syscall { syscall } {
+    global syscall_insn
+    global gdb_prompt
+    global pf_prefix
+
+    set testfile "disp-step-$syscall"
+
+    if [prepare_for_testing ${testfile}.exp ${testfile} ${testfile}.c {debug}] {
+	untested ${testfile}.exp
+	return -1
+    }
+
+    if { ![runto main] } then {
+	fail "run to main ($syscall)"
+	return
+    }
+
+    set old_pf_prefix $pf_prefix
+    lappend pf_prefix "$syscall:"
+
+    # Delete the breakpoint on main.
+    gdb_test_no_output "delete break 1"
+
+    gdb_test "break marker" "Breakpoint.*at.* file .*${testfile}.c, line.*"
+    gdb_test_no_output "set displaced-stepping off"
+
+    set syscall_bp 0
+    gdb_test_multiple "break $syscall"  "break $syscall" {
+	-re "Breakpoint (\[0-9\]*) at .*$gdb_prompt $" {
+	    set syscall_bp $expect_out(1,string)
+	    pass "break $syscall"
+	}
+    }
+
+    gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, .* in $syscall ().*" \
+	"continue to $syscall (1st time)"
+    # Hit the breakpoint on $syscall for the first time.  In this time, we will let PLT
+    # resolution done, and the number single steps we will do later will be
+    # reduced.
+
+    gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, .* in $syscall ().*" \
+	"continue to $syscall (2nd time)"
+    # Hit the breakpoint on $syscall for the second time.  In this time, the address
+    # of syscall insn and next insn of syscall are recorded.
+
+    gdb_test "display/i \$pc" ".*"
+
+
+    # Single step until we see sysall insn or we reach the upper bound of loop
+    # iterations.
+    set see_syscall_insn 0
+
+    for {set i 0} {$i < 1000 && $see_syscall_insn == 0} {incr i} {
+	send_gdb "stepi\n"
+	gdb_expect {
+	    -re ".*$syscall_insn.*$gdb_prompt $" {
+		set see_syscall_insn 1
+	    }
+	    -re ".*$gdb_prompt $" {}
+	}
+    }
+
+    if {$see_syscall_insn == 0} then {
+	fail "find syscall insn in $syscall"
+	set pf_prefix $old_pf_prefix
+	return -1
+    }
+
+    set syscall_insn_addr [get_hexadecimal_valueof "\$pc" "0"]
+    gdb_test "stepi" ".*" "stepi $syscall insn"
+    set syscall_insn_next_addr [get_hexadecimal_valueof "\$pc" "0"]
+
+    gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, .* in $syscall ().*" \
+	"continue to $syscall (3rd time)"
+
+    # Hit the breakpoint on $syscall for the third time.  In this time, we'll set
+    # breakpoint on the syscall insn we recorded previously, and single step over it.
+
+    set syscall_insn_bp 0
+    gdb_test_multiple "break \*$syscall_insn_addr"  "break on syscall insn" {
+	-re "Breakpoint (\[0-9\]*) at .*$gdb_prompt $" {
+	    set syscall_insn_bp $expect_out(1,string)
+	    pass "break on syscall insns"
+	}
+    }
+    gdb_test_no_output "delete $syscall_bp" "delete break $syscall"
+
+    gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, .*" \
+	"continue to syscall insn $syscall"
+
+    gdb_test_no_output "set displaced-stepping on"
+
+    # Check the address of next instruction of syscall.
+    gdb_test "stepi" ".*$syscall_insn_next_addr.*" "single step over $syscall"
+
+    # Delete breakpoint syscall insns to avoid interference to other syscalls.
+    gdb_test_no_output "delete $syscall_insn_bp" "delete break $syscall insn"
+
+    gdb_test "continue" "Continuing\\..*Breakpoint \[0-9\]+, marker \\(\\) at.*" \
+	"continue to marker ($syscall)"
+
+    set pf_prefix $old_pf_prefix
+}
+
+disp_step_cross_syscall "fork"
+disp_step_cross_syscall "vfork"