From 5d727a4b20257275df59182b00f3bf240772cd0d Mon Sep 17 00:00:00 2001 From: Christophe Lyon Date: Tue, 10 Sep 2019 09:47:49 +0200 Subject: [ARM/FDPIC v6 06/24] [ARM] FDPIC: Add support for c++ exceptions MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The main difference with existing support is that function addresses are function descriptor addresses instead. This means that all code dealing with function pointers now has to cope with function descriptors instead. For the same reason, Linux kernel helpers can no longer be called by dereferencing their address, so we implement wrappers that directly call the kernel helpers. When restoring a function address, we also have to restore the FDPIC register value (r9). 2019-09-10 Christophe Lyon Mickaël Guêné gcc/ * ginclude/unwind-arm-common.h (unwinder_cache): Add reserved5 field. libgcc/ * config/arm/linux-atomic.c (__kernel_cmpxchg): Add FDPIC support. (__kernel_dmb): Likewise. (__fdpic_cmpxchg): New function. (__fdpic_dmb): New function. * config/arm/unwind-arm.h (FDPIC_REGNUM): New define. (gnu_Unwind_Find_got): New function. (_Unwind_decode_typeinfo_ptr): Add FDPIC support. * unwind-arm-common.inc (UCB_PR_GOT): New. (funcdesc_t): New struct. (get_eit_entry): Add FDPIC support. (unwind_phase2): Likewise. (unwind_phase2_forced): Likewise. (__gnu_Unwind_RaiseException): Likewise. (__gnu_Unwind_Resume): Likewise. (__gnu_Unwind_Backtrace): Likewise. * unwind-pe.h (read_encoded_value_with_base): Likewise. libstdc++/ * libsupc++/eh_personality.cc (get_ttype_entry): Add FDPIC support. Co-Authored-By: Mickaël Guêné From-SVN: r275568 --- gcc/ginclude/unwind-arm-common.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'gcc/ginclude') diff --git a/gcc/ginclude/unwind-arm-common.h b/gcc/ginclude/unwind-arm-common.h index 6df783e..d4eb03e 100644 --- a/gcc/ginclude/unwind-arm-common.h +++ b/gcc/ginclude/unwind-arm-common.h @@ -91,7 +91,7 @@ extern "C" { _uw reserved2; /* Personality routine address */ _uw reserved3; /* Saved callsite address */ _uw reserved4; /* Forced unwind stop arg */ - _uw reserved5; + _uw reserved5; /* Personality routine GOT value in FDPIC mode. */ } unwinder_cache; /* Propagation barrier cache (valid after phase 1): */ -- cgit v1.1