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| author | Yvan Roux <yvan.roux@foss.st.com> | 2022-06-09 16:31:40 +0200 |
|---|---|---|
| committer | Yvan Roux <yvan.roux@foss.st.com> | 2022-06-09 16:31:40 +0200 |
| commit | 148ca9dd5cf96049c0db17c1230e4b96c0ac054a (patch) | |
| tree | c47d4a7070afc733af80299192a4abb6dc74ee5d | |
| parent | 575a212a78c6f7e213933cf96d9a63642edc5069 (diff) | |
| download | gdb-148ca9dd5cf96049c0db17c1230e4b96c0ac054a.zip gdb-148ca9dd5cf96049c0db17c1230e4b96c0ac054a.tar.gz gdb-148ca9dd5cf96049c0db17c1230e4b96c0ac054a.tar.bz2 | |
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>
| -rw-r--r-- | gdb/arm-tdep.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c index 591a2da..09670b6 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) { |