https://bugs.kde.org/show_bug.cgi?id=388084
Bug ID: 388084
Summary: armv7l Unrecognised instruction "bkpt" 0xE1200070
Product: valgrind
Version: 3.13.0
Platform: Fedora RPMs
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: vex
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
On armv7l (RaspberryPi-3B ARM in 32-bit mode) coregrind does not recognize the
instruction "bkpt" which is 0xE1200070. This is a "compiled-in breakpoint"
which should generate SIGTRAP, much like "int3" 0xcc on x86. [Except that x86
stops after the int3, while ARM stops at the bkpt.]
The instruction is documented in ARM Architecture Reference Manual, ARM DDI
0100E on p.A4-14 (.pdf p.114).
===== console log
$ ./gdbtest ## kernel-4.14.6-300.fc27.armv7hl
Trace/breakpoint trap (core dumped)
$ valgrind --tool=none ./gdbtest
==2518== Nulgrind, the minimal Valgrind tool
==2518== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote.
==2518== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info
==2518== Command: ./gdbtest
==2518==
disInstr(arm): unhandled instruction: 0xE1200070
cond=14(0xE) 27:20=18(0x12) 4:4=1 3:0=0(0x0)
<<snip>>
==2518== Process terminating with default action of signal 4 (SIGILL): dumping
core
==2518== Illegal opcode at address 0x103E4
==2518== at 0x103E4: main (gdbtest.c:4)
===== end console log
===== test case file gdbtest.c
int
main(int argc, char *argv[])
{
asm("bkpt");
return 0;
}
===== end test case file gdbtest.c
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