gdb/testsuite/gdb.arch/arm-single-step-kernel-helper.exp

   1 # Copyright (C) 2016-2017 Free Software Foundation, Inc.
   2 #
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16 if { ![is_aarch32_target] } {
  17     verbose "Skipping ${gdb_test_file_name}."
  18     return
  19 }
  20
  21 standard_testfile
  22
  23 if { [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} \
  24     [list debug]] } {
  25     return -1
  26 }
  27
  28 if { ![runto_main] } {
  29     return -1
  30 }
  31
  32 # Check kernel helpers are supported or not.
  33
  34 set kernel_helper_supported 0
  35 gdb_test_multiple "p *kernel_user_helper_version" \
  36     "check kernel helper version" {
  37         -re " = ($decimal)\r\n$gdb_prompt $" {
  38             if { $expect_out(1,string) >= 1 } {
  39                 set kernel_helper_supported 1
  40             }
  41         }
  42     }
  43
  44 if { !$kernel_helper_supported } {
  45     unsupported "kernel doesn't have helpers"
  46     return 0
  47 }
  48
  49 # Get the instruction branching to kernel helper, they can be
  50 # blx rN or bx rN.
  51 set branch_to_kernel_helper 0
  52 set branch_insn "bl?x\[ \t\]*r${decimal}"
  53 set test "disassemble main"
  54 gdb_test_multiple $test $test {
  55     -re ".*($hex) <\\+$decimal>:\[ \t\]+$branch_insn" {
  56         set branch_to_kernel_helper $expect_out(1,string)
  57         exp_continue
  58     }
  59     -re ".*$gdb_prompt $" {
  60     }
  61 }
  62
  63 if { ![gdb_assert $branch_to_kernel_helper \
  64            "find instruction branch to kernel helper"] } {
  65     return
  66 }
  67
  68 with_test_prefix "single-step" {
  69     gdb_breakpoint "*${branch_to_kernel_helper}"
  70     gdb_continue_to_breakpoint "branch to kernel helper"
  71     gdb_test "si"
  72
  73     set test "bt"
  74     gdb_test_multiple $test $test {
  75         -re "#0  \[^\\r\\n\]*main .*\r\n$gdb_prompt $" {
  76             # Test that the program still stops in main rather than
  77             # somewhere else.
  78             pass $test
  79         }
  80         -re "#0  0xffff0fe0 .*\r\n$gdb_prompt $" {
  81             # AArch64 linux kernel can do hardware single step, so
  82             # the program can stop at kernel helper.
  83             pass $test
  84         }
  85
  86     }
  87
  88     delete_breakpoints
  89 }
  90
  91 with_test_prefix "cond-breakpoint" {
  92     gdb_breakpoint "*${branch_to_kernel_helper} if i > 5"
  93     gdb_continue_to_breakpoint "branch to kernel helper"
  94     gdb_test "p i" " = 6"
  95
  96     delete_breakpoints
  97 }