---

yaml --- r: 34093 b: refs/heads/master c: c3412dc h: refs/heads/master i: 34091: c767193 v: v3
git-mirror · Sep 13, 2006 · eae4a14 · eae4a14
1 parent 2f168ed
commit eae4a14
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Showing 2 changed files with 26 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f50d4cfc98d70f919afb2924b1b53c36b2f4e62f
+refs/heads/master: c3412dcb75ff4d64b44bedc72761d5707d19edf7
diff --git a/trunk/arch/powerpc/kernel/traps.c b/trunk/arch/powerpc/kernel/traps.c
@@ -598,6 +598,9 @@ static void parse_fpe(struct pt_regs *regs)
 #define INST_STSWI		0x7c0005aa
 #define INST_STSWX		0x7c00052a
 
+#define INST_POPCNTB		0x7c0000f4
+#define INST_POPCNTB_MASK	0xfc0007fe
+
 static int emulate_string_inst(struct pt_regs *regs, u32 instword)
 {
 	u8 rT = (instword >> 21) & 0x1f;
@@ -666,6 +669,23 @@ static int emulate_string_inst(struct pt_regs *regs, u32 instword)
 	return 0;
 }
 
+static int emulate_popcntb_inst(struct pt_regs *regs, u32 instword)
+{
+	u32 ra,rs;
+	unsigned long tmp;
+
+	ra = (instword >> 16) & 0x1f;
+	rs = (instword >> 21) & 0x1f;
+
+	tmp = regs->gpr[rs];
+	tmp = tmp - ((tmp >> 1) & 0x5555555555555555ULL);
+	tmp = (tmp & 0x3333333333333333ULL) + ((tmp >> 2) & 0x3333333333333333ULL);
+	tmp = (tmp + (tmp >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
+	regs->gpr[ra] = tmp;
+
+	return 0;
+}
+
 static int emulate_instruction(struct pt_regs *regs)
 {
 	u32 instword;
@@ -703,6 +723,11 @@ static int emulate_instruction(struct pt_regs *regs)
 	if ((instword & INST_STRING_GEN_MASK) == INST_STRING)
 		return emulate_string_inst(regs, instword);
 
+	/* Emulate the popcntb (Population Count Bytes) instruction. */
+	if ((instword & INST_POPCNTB_MASK) == INST_POPCNTB) {
+		return emulate_popcntb_inst(regs, instword);
+	}
+
 	return -EINVAL;
 }