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Handle use of r18 as a TCB pointer on aarch64-vxworks

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Pick an alternate static chain regnum and document that
the port needs to be configured to issue -ffixed-r18 by
default.  The current definition of TARGET_OS_USES_R18 is
not honored by the common part of the back-end.

2020-11-04  Olivier Hainque  <hainque@adacore.com>

gcc/
	* config/aarch64/aarch64-vxworks.h (TARGET_OS_USES_R18):
	Remove definition.
	(STATIC_CHAIN_REGNUM): Redefine to 9.
This commit is contained in:
Olivier Hainque 2020-11-04 08:05:06 +00:00
parent 2f93a2a03a
commit 7fa1b2c8da
1 changed files with 7 additions and 5 deletions
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12
gcc/config/aarch64/aarch64-vxworks.h
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@ -60,12 +60,14 @@ along with GCC; see the file COPYING3. If not see
#undef STACK_CHECK_PROTECT
#define STACK_CHECK_PROTECT 16384
/* The VxWorks environment on aarch64 is llvm-based only, uses R18 as
a TCB pointer. */
/* The VxWorks environment on aarch64 is llvm-based. */
#undef VXWORKS_PERSONALITY
#define VXWORKS_PERSONALITY "llvm"
#undef TARGET_OS_USES_R18
#define TARGET_OS_USES_R18 1
/* VxWorks uses R18 as a TCB pointer. We must pick something else as
the static chain and R18 needs to be claimed "fixed". Until we
arrange to override the common parts of the port family to
acknowledge the latter, configure --with-specs="-ffixed-r18". */
#undef STATIC_CHAIN_REGNUM
#define STATIC_CHAIN_REGNUM 9