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| author | Andreas Arnez <arnez@linux.vnet.ibm.com> | 2018-01-19 14:14:07 +0100 |
|---|---|---|
| committer | Andreas Arnez <arnez@linux.vnet.ibm.com> | 2018-01-19 14:14:07 +0100 |
| commit | d6ad07fdef94777bb512f072361706bcc743d51c (patch) | |
| tree | 2b46c42dc0f92450250d265e92fd8d2002b990a4 /gdb/testsuite/gdb.arch | |
| parent | ee3fbc1ebb0cdd0785f4c328c5daaa4a4cdf3f91 (diff) | |
| download | gdb-d6ad07fdef94777bb512f072361706bcc743d51c.zip gdb-d6ad07fdef94777bb512f072361706bcc743d51c.tar.gz gdb-d6ad07fdef94777bb512f072361706bcc743d51c.tar.bz2 | |
S390: Improve comments for s390-tdbregs test case
This adds more explanation as to why the test case must be compiled with
the -msoft-float option. It also documents the my_tbegin and my_tend
functions.
gdb/testsuite/ChangeLog:
* gdb.arch/s390-tdbregs.c (my_tbegin): Add comment documenting the
function.
(my_tend): Likewise.
* gdb.arch/s390-tdbregs.exp: Enhance comment; explain the
rationale of avoiding FP- and vector instructions.
Diffstat (limited to 'gdb/testsuite/gdb.arch')
| -rw-r--r-- | gdb/testsuite/gdb.arch/s390-tdbregs.c | 9 | ||||
| -rw-r--r-- | gdb/testsuite/gdb.arch/s390-tdbregs.exp | 6 |
2 files changed, 13 insertions, 2 deletions
diff --git a/gdb/testsuite/gdb.arch/s390-tdbregs.c b/gdb/testsuite/gdb.arch/s390-tdbregs.c index 2c768bb..57365ae 100644 --- a/gdb/testsuite/gdb.arch/s390-tdbregs.c +++ b/gdb/testsuite/gdb.arch/s390-tdbregs.c @@ -17,6 +17,13 @@ #include <stdio.h> +/* Start a transaction. To avoid the need for FPR save/restore, assume + that no FP- or vector registers are modified within the transaction. + Thus invoke TBEGIN with the "allow floating-point operation" flag set + to zero, which forces a transaction abort when hitting an FP- or vector + instruction. Also assume that TBEGIN will eventually succeed, so just + retry indefinitely. */ + static void my_tbegin () { @@ -28,6 +35,8 @@ my_tbegin () : "cc", "memory" ); } +/* End a transaction. */ + static void my_tend () { diff --git a/gdb/testsuite/gdb.arch/s390-tdbregs.exp b/gdb/testsuite/gdb.arch/s390-tdbregs.exp index 47d9d38..e454feb 100644 --- a/gdb/testsuite/gdb.arch/s390-tdbregs.exp +++ b/gdb/testsuite/gdb.arch/s390-tdbregs.exp @@ -26,8 +26,10 @@ if { ![istarget s390-*-*] && ![istarget s390x-*-* ] } { standard_testfile .c -# Use soft float, so the compiler doesn't use floating-point or vector -# instructions. +# The test case assumes that no FP- or vector instructions occur within +# the transaction. Thus tell the compiler to use soft float, so it +# doesn't emit them. Some GCC versions may otherwise do so, and an +# endless loop would result. if { [prepare_for_testing "failed to prepare" $testfile $srcfile \ [list "debug" "additional_flags=-msoft-float"]] } { return -1 |