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a4011720d4
Unwind the $pl3_ssp register. We now have an updated value for the shadow stack pointer when moving up or down the frame level. Note that $pl3_ssp can become unavailable when moving to a frame before the shadow stack enablement. In the example below, shadow stack is enabled in the function 'call1'. Thus, when moving to a frame level above the function, $pl3_ssp will become unavaiable. Following the restriction of the linux kernel, implement the unwinding for amd64 linux only. Before this patch: ~~~ Breakpoint 1, call2 (j=3) at sample.c:44 44 return 42; (gdb) p $pl3_ssp $1 = (void *) 0x7ffff79ffff8 (gdb) up 55 call2 (3); (gdb) p $pl3_ssp $2 = (void *) 0x7ffff79ffff8 (gdb) up 68 call1 (43); (gdb) p $pl3_ssp $3 = (void *) 0x7ffff79ffff8 ~~~ After this patch: ~~~ Breakpoint 1, call2 (j=3) at sample.c:44 44 return 42; (gdb) p $pl3_ssp $1 = (void *) 0x7ffff79ffff8 (gdb) up 55 call2 (3); (gdb) p $pl3_ssp $2 = (void *) 0x7ffff7a00000 (gdb) up 68 call1 (43i); (gdb) p $pl3_ssp $3 = <unavailable> ~~~ As we now have an updated value for each selected frame, the return command is now enabled for shadow stack enabled programs, too. We therefore add a test for the return command and shadow stack support, and for an updated shadow stack pointer after a frame level change. Reviewed-By: Thiago Jung Bauermann <thiago.bauermann@linaro.org> Approved-By: Luis Machado <luis.machado@arm.com> Approved-By: Andrew Burgess <aburgess@redhat.com>
36 lines
913 B
C
36 lines
913 B
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2024-2025 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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static int
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call2 ()
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{
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return 42; /* break call2. */
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}
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static int
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call1 ()
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{
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return call2 (); /* break call1. */
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}
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int
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main ()
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{
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call1 (); /* break main. */
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return 0;
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}
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