From: Sathvika Vasireddy <sathvika@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: sathvika@linux.vnet.ibm.com, naveen.n.rao@linux.ibm.com, dja@axtens.net
Subject: [PATCH v2 1/2] powerpc/sstep: Add emulation support for ‘setb’ instruction
Date: Tue, 11 May 2021 07:18:32 -0500 [thread overview]
Message-ID: <7b735b0c898da0db2af8628a64df2f5114596f22.1620727160.git.sathvika@linux.vnet.ibm.com> (raw)
In-Reply-To: <cover.1620727160.git.sathvika@linux.vnet.ibm.com>
In-Reply-To: <cover.1620727160.git.sathvika@linux.vnet.ibm.com>
This adds emulation support for the following instruction:
* Set Boolean (setb)
Signed-off-by: Sathvika Vasireddy <sathvika@linux.vnet.ibm.com>
---
arch/powerpc/lib/sstep.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 45bda2520755..aee42bcc775b 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1700,6 +1700,28 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
op->val = regs->ccr & imm;
goto compute_done;
+ case 128: /* setb */
+ if (!cpu_has_feature(CPU_FTR_ARCH_300))
+ goto unknown_opcode;
+ /*
+ * 'ra' encodes the CR field number (bfa) in the top 3 bits.
+ * Since each CR field is 4 bits,
+ * we can simply mask off the bottom two bits (bfa * 4)
+ * to yield the first bit in the CR field.
+ */
+ ra = ra & ~0x3;
+ /* 'val' stores bits of the CR field (bfa) */
+ val = regs->ccr >> (CR0_SHIFT - ra);
+ /* checks if the LT bit of CR field (bfa) is set */
+ if (val & 8)
+ op->val = -1;
+ /* checks if the GT bit of CR field (bfa) is set */
+ else if (val & 4)
+ op->val = 1;
+ else
+ op->val = 0;
+ goto compute_done;
+
case 144: /* mtcrf */
op->type = COMPUTE + SETCC;
imm = 0xf0000000UL;
--
2.16.4
next prev parent reply other threads:[~2021-05-11 12:03 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 12:18 [PATCH v2 0/2] powerpc/sstep: Add emulation support and tests for 'setb' instruction Sathvika Vasireddy
2021-05-11 12:18 ` Sathvika Vasireddy [this message]
2021-05-11 19:57 ` [PATCH v2 1/2] powerpc/sstep: Add emulation support for ‘setb’ instruction Segher Boessenkool
2021-05-17 13:34 ` Naveen N. Rao
2021-05-27 5:36 ` Sandipan Das
2021-05-11 12:18 ` [PATCH v2 2/2] powerpc/sstep: Add tests for setb instruction Sathvika Vasireddy
2021-05-17 13:34 ` Naveen N. Rao
2021-06-06 12:08 ` [PATCH v2 0/2] powerpc/sstep: Add emulation support and tests for 'setb' instruction Michael Ellerman
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