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Joel Hutton f0efd92502 [Arm][CMSE]Add warn_unused_return attribute to cmse functions 
At present it is possible to call the CMSE functions for checking
addresses (such as cmse_check_address_range) and  forget to check/use
the return value. This patch makes the interfaces more robust against
programmer error by marking these functions with the warn_unused_result
attribute. With this set, any use of these functions that does not use
the result will produce a warning.

This produces a warning on default warn levels when the result of the
cmse functions is not used.

For the following function:
void foo()
{
     int *data;
     cmse_check_address_range((int*)data, 0, 0);
}
The following warning is emitted:
warning: ignoring return value of 'cmse_check_address_range' declared
with attribute 'warn_unused_result' [-Wunused-result]
     6 |  cmse_check_address_range((int*)data, 0, 0);
        |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

gcc/ChangeLog:

2019-07-31  Joel Hutton  <Joel.Hutton@arm.com>

         * config/arm/arm_cmse.h (cmse_nonsecure_caller): Add
warn_unused_result attribute.
         (cmse_check_address_range): Add warn_unused_result attribute.

libgcc/ChangeLog:

2019-07-31  Joel Hutton  <Joel.Hutton@arm.com>

         * config/arm/cmse.c (cmse_check_address_range): Add
warn_unused_result attribute.

2019-07-31  Joel Hutton  <Joel.Hutton@arm.com>

         * gcc.target/arm/cmse/cmse-17.c: New test.

From-SVN: r273924
 		2019-07-31 08:56:35 +00:00
..
config [Arm][CMSE]Add warn_unused_return attribute to cmse functions 2019-07-31 08:56:35 +00:00
soft-fp soft-fp: Update soft-fp from glibc 2019-05-17 07:37:39 -07:00
ChangeLog [Arm][CMSE]Add warn_unused_return attribute to cmse functions 2019-07-31 08:56:35 +00:00
Makefile.in Rename SINGE_VALUE to TOPN_VALUES counters. 2019-07-03 12:42:23 +00:00
config.host [Darwin] Revert one hunk from r273016 (TLC for older Darwin versions). 2019-07-04 18:28:59 +00:00
config.in re PR debug/83917 (with -mcall-ms2sysv-xlogues, stepping into x86 tail-call restore stub gives bad backtrace) 2018-02-28 09:59:15 +01:00
configure Add --disable-tm-clone-registry libgcc configure option. 2019-06-27 16:41:03 -07:00
configure.ac Add --disable-tm-clone-registry libgcc configure option. 2019-06-27 16:41:03 -07:00
crtstuff.c Update copyright years. 2019-01-01 13:31:55 +01:00
dfp-bit.c Update copyright years. 2019-01-01 13:31:55 +01:00
dfp-bit.h Update copyright years. 2019-01-01 13:31:55 +01:00
divmod.c Update copyright years. 2019-01-01 13:31:55 +01:00
empty.mk
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emutls.c Update copyright years. 2019-01-01 13:31:55 +01:00
enable-execute-stack-empty.c
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enable-execute-stack-mprotect.c Update copyright years. 2019-01-01 13:31:55 +01:00
find-symver.awk Update copyright years. 2019-01-01 13:31:55 +01:00
fixed-bit.c Update copyright years. 2019-01-01 13:31:55 +01:00
fixed-bit.h Update copyright years. 2019-01-01 13:31:55 +01:00
fixed-obj.mk
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floatunsidf.c
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floatunsisf.c
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floatunsitf.c
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floatunsixf.c
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fp-bit.c Update copyright years. 2019-01-01 13:31:55 +01:00
fp-bit.h Update copyright years. 2019-01-01 13:31:55 +01:00
gbl-ctors.h Update copyright years. 2019-01-01 13:31:55 +01:00
gcov.h Update copyright years. 2019-01-01 13:31:55 +01:00
gen-fixed.sh
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generic-morestack-thread.c PR other/16615 [1/5] 2019-01-09 16:37:45 -05:00
generic-morestack.c PR middle-end/71924 - missing -Wreturn-local-addr returning alloca result 2019-07-08 22:15:42 -06:00
generic-morestack.h Update copyright years. 2019-01-01 13:31:55 +01:00
gstdint.h
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gthr-posix.h PR c/88546 - Copy attribute unusable for weakrefs 2019-01-04 17:57:30 -07:00
gthr-single.h Update copyright years. 2019-01-01 13:31:55 +01:00
gthr.h Update copyright years. 2019-01-01 13:31:55 +01:00
libgcc-std.ver.in Update copyright years. 2019-01-01 13:31:55 +01:00
libgcc2.c extend.texi (__clear_cache): Correct signature. 2019-02-21 16:23:12 -07:00
libgcc2.h extend.texi (__clear_cache): Correct signature. 2019-02-21 16:23:12 -07:00
libgcov-driver-system.c Remove quite obvious dead assignments. 2019-06-27 10:25:21 +00:00
libgcov-driver.c Remove indirect call top N counter type. 2019-06-07 06:41:58 +00:00
libgcov-interface.c Update copyright years. 2019-01-01 13:31:55 +01:00
libgcov-merge.c Rename SINGE_VALUE to TOPN_VALUES counters. 2019-07-03 12:42:23 +00:00
libgcov-profiler.c Rename SINGE_VALUE to TOPN_VALUES counters. 2019-07-03 12:42:23 +00:00
libgcov-util.c Rename SINGE_VALUE to TOPN_VALUES counters. 2019-07-03 12:42:23 +00:00
libgcov.h Rename SINGE_VALUE to TOPN_VALUES counters. 2019-07-03 12:42:23 +00:00
memcmp.c
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memcpy.c
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memmove.c
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memset.c
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mkheader.sh Update copyright years. 2019-01-01 13:31:55 +01:00
mkmap-flat.awk Update copyright years. 2019-01-01 13:31:55 +01:00
mkmap-symver.awk PR other/16615 [1/5] 2019-01-09 16:37:45 -05:00
offloadstuff.c Update copyright years. 2019-01-01 13:31:55 +01:00
shared-object.mk Add the nvptx port. 2014-11-10 16:12:42 +00:00
siditi-object.mk
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static-object.mk Add the nvptx port. 2014-11-10 16:12:42 +00:00
sync.c Update copyright years. 2019-01-01 13:31:55 +01:00
udivhi3.c Update copyright years. 2019-01-01 13:31:55 +01:00
udivmod.c Update copyright years. 2019-01-01 13:31:55 +01:00
udivmodhi4.c Update copyright years. 2019-01-01 13:31:55 +01:00
udivmodsi4.c Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-arm-common.inc Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-c.c re PR target/89093 (C++ exception handling clobbers d8 VFP register) 2019-04-23 12:03:41 +02:00
unwind-compat.c Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-compat.h Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-dw2-fde-compat.c Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-dw2-fde-dip.c Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-dw2-fde.c [PATCH 3/3][GCC][AARCH64] Add support for pointer authentication B key 2019-05-29 09:22:17 +00:00
unwind-dw2-fde.h Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-dw2.c [PATCH 3/3][GCC][AARCH64] Add support for pointer authentication B key 2019-05-29 09:22:17 +00:00
unwind-dw2.h Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-generic.h Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-pe.h Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-seh.c Update copyright years. 2019-01-01 13:31:55 +01:00
unwind-sjlj.c Update copyright years. 2019-01-01 13:31:55 +01:00
unwind.inc Update copyright years. 2019-01-01 13:31:55 +01:00
vtv_end.c Update copyright years. 2019-01-01 13:31:55 +01:00
vtv_end_preinit.c Update copyright years. 2019-01-01 13:31:55 +01:00
vtv_start.c Update copyright years. 2019-01-01 13:31:55 +01:00
vtv_start_preinit.c Update copyright years. 2019-01-01 13:31:55 +01:00