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From: Paul Mackerras <paulus@ozlabs.org>
To: linuxppc-dev@ozlabs.org
Subject: [PATCH v2 07/10] powerpc: Handle vector element load/stores in emulation code
Date: Fri, 25 Aug 2017 15:41:59 +1000	[thread overview]
Message-ID: <1503639722-19121-8-git-send-email-paulus@ozlabs.org> (raw)
In-Reply-To: <1503639722-19121-1-git-send-email-paulus@ozlabs.org>

This adds code to analyse_instr() and emulate_step() to handle the
vector element loads and stores:

lvebx, lvehx, lvewx, stvebx, stvehx, stvewx.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
---
 arch/powerpc/lib/sstep.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 48 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index 0b295fb..82b1e69 100644
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -475,7 +475,7 @@ static nokprobe_inline int do_vec_load(int rn, unsigned long ea,
 		return -EFAULT;
 	/* align to multiple of size */
 	ea &= ~(size - 1);
-	err = copy_mem_in(u.b, ea, size);
+	err = copy_mem_in(&u.b[ea & 0xf], ea, size);
 	if (err)
 		return err;
 
@@ -507,7 +507,7 @@ static nokprobe_inline int do_vec_store(int rn, unsigned long ea,
 	else
 		u.v = current->thread.vr_state.vr[rn];
 	preempt_enable();
-	return copy_mem_out(u.b, ea, size);
+	return copy_mem_out(&u.b[ea & 0xf], ea, size);
 }
 #endif /* CONFIG_ALTIVEC */
 
@@ -1808,6 +1808,31 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 			break;
 
 #ifdef CONFIG_ALTIVEC
+		/*
+		 * Note: for the load/store vector element instructions,
+		 * bits of the EA say which field of the VMX register to use.
+		 */
+		case 7:		/* lvebx */
+			if (!(regs->msr & MSR_VEC))
+				goto vecunavail;
+			op->type = MKOP(LOAD_VMX, 0, 1);
+			op->element_size = 1;
+			break;
+
+		case 39:	/* lvehx */
+			if (!(regs->msr & MSR_VEC))
+				goto vecunavail;
+			op->type = MKOP(LOAD_VMX, 0, 2);
+			op->element_size = 2;
+			break;
+
+		case 71:	/* lvewx */
+			if (!(regs->msr & MSR_VEC))
+				goto vecunavail;
+			op->type = MKOP(LOAD_VMX, 0, 4);
+			op->element_size = 4;
+			break;
+
 		case 103:	/* lvx */
 		case 359:	/* lvxl */
 			if (!(regs->msr & MSR_VEC))
@@ -1816,6 +1841,27 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
 			op->element_size = 16;
 			break;
 
+		case 135:	/* stvebx */
+			if (!(regs->msr & MSR_VEC))
+				goto vecunavail;
+			op->type = MKOP(STORE_VMX, 0, 1);
+			op->element_size = 1;
+			break;
+
+		case 167:	/* stvehx */
+			if (!(regs->msr & MSR_VEC))
+				goto vecunavail;
+			op->type = MKOP(STORE_VMX, 0, 2);
+			op->element_size = 2;
+			break;
+
+		case 199:	/* stvewx */
+			if (!(regs->msr & MSR_VEC))
+				goto vecunavail;
+			op->type = MKOP(STORE_VMX, 0, 4);
+			op->element_size = 4;
+			break;
+
 		case 231:	/* stvx */
 		case 487:	/* stvxl */
 			if (!(regs->msr & MSR_VEC))
-- 
2.7.4

  parent reply	other threads:[~2017-08-25  6:02 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-25  5:41 [PATCH v2 0/10] powerpc: Beef up single-stepping/instruction emulation infrastructure Paul Mackerras
2017-08-25  5:41 ` [PATCH v2 01/10] powerpc: Handle most loads and stores in instruction emulation code Paul Mackerras
2017-08-26 14:56   ` Segher Boessenkool
2017-08-28  5:48   ` Michael Ellerman
2017-08-25  5:41 ` [PATCH v2 02/10] powerpc: Change analyse_instr so it doesn't modify *regs Paul Mackerras
2017-08-25  5:41 ` [PATCH v2 03/10] powerpc: Fix emulation of the isel instruction Paul Mackerras
2017-08-25  5:41 ` [PATCH v2 04/10] powerpc: Add emulation for the addpcis instruction Paul Mackerras
2017-08-25  5:41 ` [PATCH v2 05/10] powerpc: Make load/store emulation use larger memory accesses Paul Mackerras
2017-08-25  5:41 ` [PATCH v2 06/10] powerpc: Emulate FP/vector/VSX loads/stores correctly when regs not live Paul Mackerras
2017-08-25  5:41 ` Paul Mackerras [this message]
2017-08-25  5:42 ` [PATCH v2 08/10] powerpc: Emulate load/store floating double pair instructions Paul Mackerras
2017-08-25  5:42 ` [PATCH v2 09/10] powerpc: Handle opposite-endian processes in emulation code Paul Mackerras
2017-08-25  5:42 ` [PATCH v2 10/10] powerpc/64: Fix update forms of loads and stores to write 64-bit EA Paul Mackerras

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