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vxworks: enable use of .init_array/.fini_array for cdtors

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The target OS actually runs all function pointers found in the _ctors
array when the module is loaded. So it is not that hard to make use of
the "modern" .init_array/.fini_array mechanism - it mostly just requires
a linker script adding the _ctors and _dtors symbols and terminating
LONG(0) entries.

Assume that if the user passed --enable-initfini-array when building
gcc, the rest of the toolchain (including the link spec and linker
script) is set up appropriately.

Note that configuring with --enable-initfini-array may prevent the -mrtp
mode from working, due to the (unconditional) use of .init_array.*
sections instead of .ctors.* - however, that is the case regardless of this
patch.

From-SVN: r263691
This commit is contained in:
Rasmus Villemoes 2018-08-21 10:50:27 +02:00 • committed by Rasmus Villemoes
parent 9a5b8df700
commit ace193dc47
3 changed files with 19 additions and 5 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2018-08-21 Rasmus Villemoes <rv@rasmusvillemoes.dk>
* config/vxworks.c: Set targetm.have_ctors_dtors
if HAVE_INITFINI_ARRAY_SUPPORT.
* config/vxworks.h: Set SUPPORTS_INIT_PRIORITY
if HAVE_INITFINI_ARRAY_SUPPORT.
2018-08-21 Rasmus Villemoes <rv@rasmusvillemoes.dk>
* config/vxworks.h: Add $(WIND_BASE)/target/h/wrn/coreip to

7
gcc/config/vxworks.c
View file

@ -143,8 +143,11 @@ vxworks_override_options (void)
targetm.emutls.debug_form_tls_address = true;
}
/* We can use .ctors/.dtors sections only in RTP mode. */
targetm.have_ctors_dtors = TARGET_VXWORKS_RTP;
/* We can use .ctors/.dtors sections only in RTP mode. But, if the
compiler was built with --enable-initfini-array, assume the
toolchain implements the proper glue to make .init_array and
.fini_array work. */
targetm.have_ctors_dtors = TARGET_VXWORKS_RTP || HAVE_INITFINI_ARRAY_SUPPORT;
/* PIC is only supported for RTPs. */
if (flag_pic && !TARGET_VXWORKS_RTP)

10
gcc/config/vxworks.h
View file

@ -142,9 +142,13 @@ along with GCC; see the file COPYING3. If not see
#define VXWORKS_OVERRIDE_OPTIONS vxworks_override_options ()
extern void vxworks_override_options (void);
/* Only RTPs support prioritized constructors and destructors:
the implementation relies on numbered .ctors* sections. */
#define SUPPORTS_INIT_PRIORITY TARGET_VXWORKS_RTP
/* RTPs support prioritized constructors and destructors: the
implementation relies on numbered .ctors* sections. If the compiler
was built with --enable-initfini-array, we assume the user uses a
linker script that sorts and merges the .init_array.* sections
appropriately. */
#define SUPPORTS_INIT_PRIORITY \
(TARGET_VXWORKS_RTP || HAVE_INITFINI_ARRAY_SUPPORT)
/* VxWorks requires special handling of constructors and destructors.
All VxWorks configurations must use these functions. */