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From: Yvan Roux <yroux@sourceware.org> To: gdb-cvs@sourceware.org Subject: [binutils-gdb] gdb/arm: Terminate unwinding when LR is 0xffffffff Date: Thu, 9 Jun 2022 14:33:36 +0000 (GMT) [thread overview] Message-ID: <20220609143336.80AE63853547@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=148ca9dd5cf96049c0db17c1230e4b96c0ac054a commit 148ca9dd5cf96049c0db17c1230e4b96c0ac054a Author: Yvan Roux <yvan.roux@foss.st.com> Date: Thu Jun 9 16:31:40 2022 +0200 gdb/arm: Terminate unwinding when LR is 0xffffffff ARMv7-M Architecture Reference "A2.3.1 Arm core registers" states that LR is set to 0xffffffff on reset. ARMv8-M Architecture Reference "B3.3 Registers" states that LR is set to 0xffffffff on warm reset if Main Extension is implemented, otherwise the value is unknown. Signed-off-by: Torbjörn SVENSSON <torbjorn.svensson@st.com> Signed-off-by: Yvan Roux <yvan.roux@foss.st.com> Diff: --- gdb/arm-tdep.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c index 591a2da99f2..09670b69a1d 100644 --- a/gdb/arm-tdep.c +++ b/gdb/arm-tdep.c @@ -3330,6 +3330,17 @@ arm_m_exception_cache (struct frame_info *this_frame) lr = get_frame_register_unsigned (this_frame, ARM_LR_REGNUM); sp = get_frame_register_unsigned (this_frame, ARM_SP_REGNUM); + /* ARMv7-M Architecture Reference "A2.3.1 Arm core registers" + states that LR is set to 0xffffffff on reset. ARMv8-M Architecture + Reference "B3.3 Registers" states that LR is set to 0xffffffff on warm + reset if Main Extension is implemented, otherwise the value is unknown. */ + if (lr == 0xffffffff) + { + /* Terminate any further stack unwinding by referring to self. */ + arm_cache_set_active_sp_value (cache, tdep, sp); + return cache; + } + fnc_return = ((lr & 0xfffffffe) == 0xfefffffe); if (tdep->have_sec_ext && fnc_return) {
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