From: Matt Brown <matthew.brown.dev@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: anton@samba.org
Subject: [PATCH 1/5] powerpc/lib/sstep: Add cmpb instruction emulation
Date: Thu, 13 Jul 2017 13:25:44 +1000 [thread overview]
Message-ID: <20170713032548.451-1-matthew.brown.dev@gmail.com> (raw)
This patch adds emulation of the cmpb instruction, enabling xmon to
emulate this instruction.
Signed-off-by: Matt Brown <matthew.brown.dev@gmail.com>
---
arch/powerpc/lib/sstep.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 33117f8..f3e9ba8 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -596,6 +596,23 @@ static nokprobe_inline void do_cmp_unsigned(struct pt_regs *regs, unsigned long
regs->ccr = (regs->ccr & ~(0xf << shift)) | (crval << shift);
}
+static nokprobe_inline void do_cmpb(struct pt_regs *regs, unsigned long v1,
+ unsigned long v2, int rd)
+{
+ unsigned long out_val, mask;
+ int i;
+
+ out_val = 0;
+ for (i = 0; i < 8; i++) {
+ mask = 0xff << (i * 8);
+
+ if ((v1 & mask) == (v2 & mask))
+ out_val |= mask;
+ }
+
+ regs->gpr[rd] = out_val;
+}
+
static nokprobe_inline int trap_compare(long v1, long v2)
{
int ret = 0;
@@ -1049,6 +1066,13 @@ int analyse_instr(struct instruction_op *op, struct pt_regs *regs,
do_cmp_unsigned(regs, val, val2, rd >> 2);
goto instr_done;
+ case 19173952: /* cmpb */
+ val = regs->gpr[rd];
+ val2 = regs->gpr[rb];
+
+ do_cmpb(regs, val, val2, ra);
+ goto instr_done;
+
/*
* Arithmetic instructions
*/
--
2.9.3
next reply other threads:[~2017-07-13 3:26 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-13 3:25 Matt Brown [this message]
2017-07-13 3:25 ` [PATCH 2/5] powerpc/lib/sstep: Add popcnt instruction emulation Matt Brown
2017-07-13 3:25 ` [PATCH 3/5] powerpc/lib/sstep: Add bpermd " Matt Brown
2017-07-13 7:16 ` Gabriel Paubert
2017-07-13 7:28 ` Segher Boessenkool
2017-07-14 4:19 ` Matt Brown
2017-07-14 16:17 ` Segher Boessenkool
2017-07-13 3:25 ` [PATCH 4/5] powerpc/lib/sstep: Add prty " Matt Brown
2017-07-13 7:37 ` Segher Boessenkool
2017-07-14 0:46 ` Matt Brown
2017-07-14 19:02 ` kbuild test robot
2017-07-13 3:25 ` [PATCH 5/5] powerpc/lib/sstep: Add isel " Matt Brown
2017-07-13 7:47 ` Segher Boessenkool
2017-07-14 0:49 ` Matt Brown
2017-07-13 3:51 ` [PATCH 1/5] powerpc/lib/sstep: Add cmpb " Andrew Donnellan
2017-07-13 6:43 ` Segher Boessenkool
2017-07-13 7:10 ` Segher Boessenkool
2017-07-13 6:46 ` Segher Boessenkool
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