linuxppc-dev.lists.ozlabs.org archive mirror
 help / color / mirror / Atom feed
From: Sathvika Vasireddy <sathvika@linux.vnet.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: naveen.n.rao@linux.ibm.com,
	Sathvika Vasireddy <sathvika@linux.vnet.ibm.com>
Subject: [PATCH 1/2] powerpc/sstep: Add emulation support for ‘setb’ instruction
Date: Fri, 16 Apr 2021 02:02:48 -0500	[thread overview]
Message-ID: <767e53c4c27da024ca277e21ffcd0cff131f5c73.1618469454.git.sathvika@linux.vnet.ibm.com> (raw)
In-Reply-To: <cover.1618469454.git.sathvika@linux.vnet.ibm.com>
In-Reply-To: <cover.1618469454.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 | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index c6aebc149d14..263c613d7490 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1964,6 +1964,18 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 			op->val = ~(regs->gpr[rd] | regs->gpr[rb]);
 			goto logical_done;
 
+		case 128:	/* setb */
+			if (!cpu_has_feature(CPU_FTR_ARCH_300))
+				goto unknown_opcode;
+			ra = ra & ~0x3;
+			if ((regs->ccr) & (1 << (31 - ra)))
+				op->val = -1;
+			else if ((regs->ccr) & (1 << (30 - ra)))
+				op->val = 1;
+			else
+				op->val = 0;
+			goto compute_done;
+
 		case 154:	/* prtyw */
 			do_prty(regs, op, regs->gpr[rd], 32);
 			goto logical_done_nocc;
-- 
2.16.4


  reply	other threads:[~2021-04-16  6:48 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16  7:02 [PATCH 0/2] powerpc/sstep: Add emulation support and tests for 'setb' instruction Sathvika Vasireddy
2021-04-16  7:02 ` Sathvika Vasireddy [this message]
2021-04-16  7:44   ` [PATCH 1/2] powerpc/sstep: Add emulation support for ‘setb’ instruction Daniel Axtens
2021-04-20  6:26     ` Naveen N. Rao
2021-04-21  7:30       ` Michael Ellerman
2021-04-22 10:01         ` Naveen N. Rao
2021-04-23 13:29           ` Michael Ellerman
2021-04-27 16:44             ` Naveen N. Rao
2021-04-22 19:13     ` Segher Boessenkool
2021-04-22 22:16       ` Gabriel Paubert
2021-04-22 23:26         ` Segher Boessenkool
2021-04-23 10:26           ` Gabriel Paubert
2021-04-23 16:57             ` Segher Boessenkool
2021-04-24 16:13       ` Daniel Axtens
2021-04-16  7:02 ` [PATCH 2/2] powerpc/sstep: Add tests for setb instruction Sathvika Vasireddy
2021-04-20 17:37   ` Naveen N. Rao

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=767e53c4c27da024ca277e21ffcd0cff131f5c73.1618469454.git.sathvika@linux.vnet.ibm.com \
    --to=sathvika@linux.vnet.ibm.com \
    --cc=linuxppc-dev@lists.ozlabs.org \
    --cc=naveen.n.rao@linux.ibm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).