From 936fda4d771fdc51d3640bdb0cc8ceec14165730 Mon Sep 17 00:00:00 2001 From: Fabiano Rosas Date: Mon, 22 Feb 2021 16:40:35 -0300 Subject: target/ppc: Fix bcdsub. emulation when result overflows The commit d03b174a83 (target/ppc: simplify bcdadd/sub functions) meant to simplify some of the code but it inadvertently altered the way the CR6 field is set after the operation has overflowed. The CR6 bits are set based on the *unbounded* result of the operation, so we need to look at the result before returning from bcd_add_mag, otherwise we will look at 0 when it overflows. Consider the following subtraction: v0 = 0x9999999999999999999999999999999c (maximum positive BCD value) v1 = 0x0000000000000000000000000000001d (negative one BCD value) bcdsub. v0,v0,v1,0 The Power ISA 2.07B says: If the unbounded result is greater than zero, do the following. If PS=0, the sign code of the result is set to 0b1100. If PS=1, the sign code of the result is set to 0b1111. If the operation overflows, CR field 6 is set to 0b0101. Otherwise, CR field 6 is set to 0b0100. POWER9 hardware: vr0 = 0x0000000000000000000000000000000c (positive zero BCD value) cr6 = 0b0101 (0x5) (positive, overflow) QEMU: vr0 = 0x0000000000000000000000000000000c (positive zero BCD value) cr6 = 0b0011 (0x3) (zero, overflow) <--- wrong This patch reverts the part of d03b174a83 that introduced the problem and adds a test-case to avoid further regressions: before: $ make run-tcg-tests-ppc64le-linux-user (...) TEST bcdsub on ppc64le bcdsub: qemu/tests/tcg/ppc64le/bcdsub.c:58: test_bcdsub_gt: Assertion `(cr >> 4) == ((1 << 2) | (1 << 0))' failed. Fixes: d03b174a83 (target/ppc: simplify bcdadd/sub functions) Reported-by: Paul Clarke Signed-off-by: Fabiano Rosas Message-Id: <20210222194035.2723056-1-farosas@linux.ibm.com> Signed-off-by: David Gibson --- tests/tcg/ppc64/Makefile.target | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 tests/tcg/ppc64/Makefile.target (limited to 'tests/tcg/ppc64') diff --git a/tests/tcg/ppc64/Makefile.target b/tests/tcg/ppc64/Makefile.target new file mode 100644 index 0000000..0c6a458 --- /dev/null +++ b/tests/tcg/ppc64/Makefile.target @@ -0,0 +1,13 @@ +# -*- Mode: makefile -*- +# +# ppc64 specific tweaks + +VPATH += $(SRC_PATH)/tests/tcg/ppc64 +VPATH += $(SRC_PATH)/tests/tcg/ppc64le + +ifneq ($(DOCKER_IMAGE)$(CROSS_CC_HAS_POWER8_VECTOR),) +PPC64_TESTS=bcdsub +endif +bcdsub: CFLAGS += -mpower8-vector + +TESTS += $(PPC64_TESTS) -- cgit v1.1