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bab22d0640
When running gdb.cp/non-trivial-retval.exp, the following shows up for both aarch64-linux and armhf-linux: Breakpoint 3, f1 (i1=23, i2=100) at src/gdb/testsuite/gdb.cp/non-trivial-retval.cc:35 35 A a; (gdb) finish Run till exit from #0 f1 (i1=23, i2=100) at src/gdb/testsuite/gdb.cp/non-trivial-retval.cc:35 main () at /src/gdb/testsuite/gdb.cp/non-trivial-retval.cc:163 163 B b = f2 (i1, i2); Value returned is $6 = {a = -11952} (gdb) The return value should be {a = 123} instead. This happens because the backends don't extract the return value from the correct location. GDB should fetch a pointer to the memory location from X8 for aarch64 and r0 for armhf. With the patch, gdb.cp/non-trivial-retval.exp has full passes on aarch64-linux and armhf-linux on Ubuntu 20.04/18.04. The problem only shows up with the "finish" command. The "call" command works correctly and displays the correct return value. This is also related to PR gdb/28681 (https://sourceware.org/bugzilla/show_bug.cgi?id=28681) and fixes FAIL's in gdb.ada/mi_var_array.exp. A new testcase is provided, and it exercises GDB's ability to "finish" a function that returns a large struct (> 16 bytes) and display the contents of this struct correctly. This has always been incorrect for these backends, but no testcase exercised this particular scenario.
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2022 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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struct big_struct_t
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{
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int int_array[5];
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double double_array[5];
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char char_array[5];
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};
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struct big_struct_t big_struct =
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{
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{1, 2, 3, 4, 5},
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{3.25, 5.0, 6.25, 1.325, -1.95},
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"abcde"
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};
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struct big_struct_t return_large_struct (void)
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{
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return big_struct;
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}
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int
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main (int argc, char **argv)
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{
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struct big_struct_t test_struct;
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test_struct = return_large_struct ();
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return 0;
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}
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