gdb/testsuite/gdb.arch/amd64-pseudo-unwind.exp

   1 # Copyright 2018-2024 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 # This test verifies that we can read and write the value of a pseudo register
  17 # in unwound frames.  For the test, we choose one raw register, rbx, and one
  18 # pseudo register that is backed by rbx, ebx.  We have two frames (the inner one,
  19 # #0 and the outer one, #1) that each set a value for rbx.  We verify that we
  20 # can read both rbx and ebx correctly for each frame, and that when we write to
  21 # ebx, rbx for that frame is correctly updated.
  22
  23 if { ![istarget x86_64-*-* ] || ![is_lp64_target] } {
  24     verbose "Skipping amd64 pseudo register unwind."
  25     return
  26 }
  27
  28 standard_testfile amd64-pseudo-unwind.c amd64-pseudo-unwind-asm.S
  29
  30 if { [prepare_for_testing "failed to prepare" ${testfile} \
  31         "${srcfile} ${srcfile2}" {debug}] } {
  32     return -1
  33 }
  34
  35 clean_restart ${binfile}
  36
  37 if ![runto_main] then {
  38     fail "could not run to main"
  39 }
  40
  41 gdb_breakpoint break_here_asm temporary
  42 gdb_continue_to_breakpoint "continue to callee"
  43
  44 # Verify the value of rbx/ebx in the inner frame (callee).
  45 with_test_prefix "callee, before change" {
  46     gdb_test "p/x \$rbx" " = 0x2021222324252627"
  47     gdb_test "p/x \$ebx" " = 0x24252627"
  48 }
  49
  50 # Verify that we can change the value of the pseudo register (ebx) in the inner
  51 # frame (callee).
  52 gdb_test_no_output "set \$ebx = 0x34353637"
  53
  54 # Verify the value of rbx/ebx in the inner frame (callee) after the change.
  55 with_test_prefix "callee, after change" {
  56     gdb_test "p/x \$rbx" " = 0x2021222334353637"
  57     gdb_test "p/x \$ebx" " = 0x34353637"
  58 }
  59
  60 # Go up one frame, and do the same.
  61 gdb_test "up"
  62
  63 # Verify the value of rbx/ebx in the outer frame (caller).
  64 with_test_prefix "caller, before change" {
  65     gdb_test "p/x \$rbx" " = 0x1011121314151617"
  66     gdb_test "p/x \$ebx" " = 0x14151617"
  67 }
  68
  69 # Verify that we can change the value of the pseudo register (ebx) in the outer
  70 # frame (caller).
  71 gdb_test_no_output "set \$ebx = 0x44454647"
  72
  73 # Verify the value of rbx/ebx in the outer frame (caller) after the change.
  74 with_test_prefix "caller, after change" {
  75     gdb_test "p/x \$rbx" " = 0x1011121344454647"
  76     gdb_test "p/x \$ebx" " = 0x44454647"
  77 }
  78
  79 # Go back to frame 0 (callee), check that the change to the outer frame didn't
  80 # mess up anything there.
  81 gdb_test "down"
  82 with_test_prefix "callee, after change in caller" {
  83     gdb_test "p/x \$rbx" " = 0x2021222334353637"
  84     gdb_test "p/x \$ebx" " = 0x34353637"
  85 }
  86
  87 # Verify that the value of the saved rbx we changed is correctly seen by the
  88 # inferior.
  89 gdb_breakpoint break_here_c temporary
  90 gdb_continue_to_breakpoint "continue to break_here_c"
  91 gdb_test "p/x value" " = 0x1011121344454647"