| Message ID | 20190909154526.11630-14-christophe.lyon@st.com |
|---|---|
| State | New |
| Headers | show
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FDPIC ABI for ARM
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diff --git a/libgcc/config/arm/unwind-arm.c b/libgcc/config/arm/unwind-arm.c index 9ba73e7..8313ee0 100644 --- a/libgcc/config/arm/unwind-arm.c +++ b/libgcc/config/arm/unwind-arm.c @@ -199,6 +199,11 @@ _Unwind_VRS_Result _Unwind_VRS_Set (_Unwind_Context *context, return _UVRSR_FAILED; vrs->core.r[regno] = *(_uw *) valuep; +#if defined(__thumb__) + /* Force LSB bit since we always run thumb code. */ + if (regno == R_PC) + vrs->core.r[regno] |= 1; +#endif return _UVRSR_OK; case _UVRSC_VFP:
From: Christophe Lyon <christophe.lyon@linaro.org> Without this, when we are unwinding across a signal frame we can jump to an even address which leads to an exception. This is needed in __gnu_persnality_sigframe_fdpic() when restoring the PC from the signal frame since the PC saved by the kernel has the LSB bit set to zero. 2019-XX-XX Christophe Lyon <christophe.lyon@st.com> Mickaël Guêné <mickael.guene@st.com> libgcc/ * config/arm/unwind-arm.c (_Unwind_VRS_Set): Handle thumb-only architecture. Change-Id: Ie84de548226bcf1751e19a09e8f091fb3013ccea -- 2.6.3