Nick,
This combines with Logan's work, and implements the libunwind bits that Logan's
patch relied on libgcc_s for, in order to get rid of that dependency.
Jon
On 6/3/14, 3:47 PM, Nick Kledzik wrote:
Dana,
Is this a separate implementation of ARM EHABI than what Logan proposed
4/13/2014? Or is this this same, but broken into steps?
+ }
+ #define _LIBUNWIND_BUILD_ZERO_COST_APIS (__i386__ || __x86_64__ ||
__arm64__ || __arm__)
+ #define _LIBUNWIND_BUILD_SJLJ_APIS 0
+ #define _LIBUNWIND_SUPPORT_FRAME_APIS (__i386__ || __x86_64__)
+ #define _LIBUNWIND_EXPORT
__attribute__((visibility("default")))
+ #define _LIBUNWIND_HIDDEN __attribute__((visibility("hidden")))
+ #define _LIBUNWIND_LOG(msg, ...) fprintf(stderr, "libuwind: " msg,
__VA_ARGS__)
+ #define _LIBUNWIND_ABORT(msg) assert_rtn(__func__, __FILE__, __LINE__, msg)
+
+ #define _LIBUNWIND_SUPPORT_COMPACT_UNWIND 0
+ #define _LIBUNWIND_SUPPORT_DWARF_UNWIND 0
+ #define _LIBUNWIND_SUPPORT_DWARF_INDEX 0
+ #define _LIBUNWIND_SUPPORT_ARM_EHABI_UNWIND 1
#endif
There will be three unwinding models: zero-cost, sj-lj, and EHABI. So there
should be three mutually exclusive build settings:
_LIBUNWIND_BUILD_ZERO_COST_APIS
_LIBUNWIND_BUILD_SJLJ_APIS
_LIBUNWIND_BUILD_ARM_EHABI_APIS
The SUPPORT_{COMPACT_UNWIND,DWARF_UNWIND,DWARF_INDEX} were intended as ways that
zero-cost unwind information could be encoded.
The patch above turns on both _LIBUNWIND_BUILD_ZERO_COST_APIS for all
architectures, which is wrong. It also leaves _LIBUNWIND_BUILD_ZERO_COST_APIS
true for __arm__ which is probably wrong too.
-Nick
On Jun 2, 2014, at 5:48 AM, Dana Jansens <[email protected]
<mailto:[email protected]>> wrote:
Hi Nick,
Can you please take a look at this patch? With this, we define an
UnwindInfoSections for ARM EHABI and are able to populate it.
We'll start making use of this in future patches, as Albert laid out here:
http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20140526/106670.html
This patch builds and passes tests on Mac.
Thanks,
Dana
<ehabi_address_space.diff>
--
Jon Roelofs
[email protected]
CodeSourcery / Mentor Embedded
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