https://gcc.gnu.org/g:a3c0112f554c676f6155db75ccab9d8393ed763c
commit r16-4533-ga3c0112f554c676f6155db75ccab9d8393ed763c Author: Olivier Hainque <[email protected]> Date: Sat Apr 20 08:43:56 2024 -0300 Redefine ASM_PREFERRED_EH_DATA_FORMAT for ppc[64]-vxworks This patch redefines ASM_PREFERRED_EH_DATA_FORMAT from the otherwise inherited linux variant, preventing DW_EH_PE_indirect in 64bit DKMs, where they are not strictly needed and where the runtime load could resolve the DW.refs to symbols of the same name within a different DKM loaded previously. gcc/ * config/rs6000/vxworks.h (ASM_PREFERRED_EH_DATA_FORMAT): Redefine. Diff: --- gcc/config/rs6000/vxworks.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/gcc/config/rs6000/vxworks.h b/gcc/config/rs6000/vxworks.h index 9eb074be31a8..13c706b61142 100644 --- a/gcc/config/rs6000/vxworks.h +++ b/gcc/config/rs6000/vxworks.h @@ -290,5 +290,21 @@ along with GCC; see the file COPYING3. If not see trigger visible link errors (hence remain harmless) if the support isn't really there. */ +/* Select a format to encode pointers in exception handling data. CODE + is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is + true if the symbol may be affected by dynamic relocations. + + This is essentially the linux64.h version with an extra guard on + TARGET_VXWORKS_RTP to avoid DW_EH_PE_indirect in 64bit DKMs as they + could result in references from one DKM to resolve to symbols exposed + by a previsouly loaded DKM even if the symbol is also provided by the + DKM where the reference takes place. */ +#undef ASM_PREFERRED_EH_DATA_FORMAT +#define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \ + ((TARGET_64BIT && TARGET_VXWORKS_RTP) || flag_pic \ + ? (((GLOBAL) ? DW_EH_PE_indirect : 0) | DW_EH_PE_pcrel \ + | (TARGET_64BIT ? DW_EH_PE_udata8 : DW_EH_PE_sdata4)) \ + : DW_EH_PE_absptr) + #endif /* TARGET_VXWORKS7 */
