From: Michael Ellerman mpe@ellerman.id.au
[ Upstream commit a02cbc7ffe529ed58b6bbe54652104fc2c88bd77 ]
Some of our TM (Transactional Memory) tests, list "r1" (the stack pointer) as a clobbered register.
GCC >= 9 doesn't accept this, and the build breaks:
ptrace-tm-spd-tar.c: In function 'tm_spd_tar': ptrace-tm-spd-tar.c:31:2: error: listing the stack pointer register 'r1' in a clobber list is deprecated [-Werror=deprecated] 31 | asm __volatile__( | ^~~ ptrace-tm-spd-tar.c:31:2: note: the value of the stack pointer after an 'asm' statement must be the same as it was before the statement
We do have some fairly large inline asm blocks in these tests, and some of them do change the value of r1. However they should all return to C with the value in r1 restored, so I think it's legitimate to say r1 is not clobbered.
As Segher points out, the r1 clobbers may have been added because of the use of `or 1,1,1`, however that doesn't actually clobber r1.
Segher also points out that some of these tests do clobber LR, because they call functions, and that is not listed in the clobbers, so add that where appropriate.
Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/20191029095324.14669-1-mpe@ellerman.id.au Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c | 2 +- tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-vsx.c | 4 ++-- tools/testing/selftests/powerpc/ptrace/ptrace-tm-tar.c | 2 +- tools/testing/selftests/powerpc/ptrace/ptrace-tm-vsx.c | 4 ++-- 4 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c index 25e23e73c72e..2ecfa1158e2b 100644 --- a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-tar.c @@ -73,7 +73,7 @@ trans: [sprn_texasr]"i"(SPRN_TEXASR), [tar_1]"i"(TAR_1), [dscr_1]"i"(DSCR_1), [tar_2]"i"(TAR_2), [dscr_2]"i"(DSCR_2), [tar_3]"i"(TAR_3), [dscr_3]"i"(DSCR_3) - : "memory", "r0", "r1", "r3", "r4", "r5", "r6" + : "memory", "r0", "r3", "r4", "r5", "r6", "lr" );
/* TM failed, analyse */ diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-vsx.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-vsx.c index f603fe5a445b..6f7fb51f0809 100644 --- a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-vsx.c +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-spd-vsx.c @@ -74,8 +74,8 @@ trans: "3: ;" : [res] "=r" (result), [texasr] "=r" (texasr) : [sprn_texasr] "i" (SPRN_TEXASR) - : "memory", "r0", "r1", "r3", "r4", - "r7", "r8", "r9", "r10", "r11" + : "memory", "r0", "r3", "r4", + "r7", "r8", "r9", "r10", "r11", "lr" );
if (result) { diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-tar.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-tar.c index e0d37f07bdeb..46ef378a15ec 100644 --- a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-tar.c +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-tar.c @@ -62,7 +62,7 @@ trans: [sprn_ppr]"i"(SPRN_PPR), [sprn_texasr]"i"(SPRN_TEXASR), [tar_1]"i"(TAR_1), [dscr_1]"i"(DSCR_1), [tar_2]"i"(TAR_2), [dscr_2]"i"(DSCR_2), [cptr1] "b" (&cptr[1]) - : "memory", "r0", "r1", "r3", "r4", "r5", "r6" + : "memory", "r0", "r3", "r4", "r5", "r6" );
/* TM failed, analyse */ diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-vsx.c b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-vsx.c index 8027457b97b7..70ca01234f79 100644 --- a/tools/testing/selftests/powerpc/ptrace/ptrace-tm-vsx.c +++ b/tools/testing/selftests/powerpc/ptrace/ptrace-tm-vsx.c @@ -62,8 +62,8 @@ trans: "3: ;" : [res] "=r" (result), [texasr] "=r" (texasr) : [sprn_texasr] "i" (SPRN_TEXASR), [cptr1] "b" (&cptr[1]) - : "memory", "r0", "r1", "r3", "r4", - "r7", "r8", "r9", "r10", "r11" + : "memory", "r0", "r3", "r4", + "r7", "r8", "r9", "r10", "r11", "lr" );
if (result) {