x86/kprobes: Fix crash when probing CS CALL instructionsgrafted

When using eBPF to probe CS CALL instructions within a function,
a crash can be triggered.

The eBPF tool probes offset 257 of the __hrtimer_run_queues()
function:

<__hrtimer_run_queues+249>:  nopl   0x0(%rax,%rax,1)
<__hrtimer_run_queues+254>:  mov    %r14,%rdi
<__hrtimer_run_queues+257>:  cs call <__x86_indirect_thunk_r12>
<__hrtimer_run_queues+263>:  mov    %eax,%r12d
<__hrtimer_run_queues+266>:  xchg   %ax,%ax
<__hrtimer_run_queues+268>:  mov    %r13,%rdi

Which triggers this crash:

  BUG: unable to handle page fault for address: 00000000000f41c9
  #PF: supervisor write access in kernel mode
  #PF: error_code(0x0002) - not-present page
  PGD 0 P4D 0
  Oops: 0002 [#1] SMP NOPTI
  CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P
  RIP: 0010:__hrtimer_run_queues+0x106/0x230

Note that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is
at the 6th byte of the above CS CALL instruction. Since the CS CALL
instruction occupies 6 bytes, the exception occurred in the middle of that
call instruction.

The root cause is that when using eBPF tools to probe in the middle of a
function, a kprobe with INT3 is used as the underlying implementation.

During single-step emulation of the original CALL instruction,
int3_emulate_call() assumes that the probed CALL instruction is 5 bytes
long. However, the actual CS-prefixed CALL instruction occupies 6 bytes,
so it constructs an incorrect exception return address. When the CPU
returns from the kprobe handler, the next instruction to be executed is at
the address of the last byte of that CS CALL instruction. Coincidentally,
starting from that address, the CPU fetches and decodes a completely
different instruction, which ultimately triggers a kernel crash.

Fix the issue by using the actual instruction length obtained from
the instruction decoder when constructing the exception return
address, rather than relying on the hardcoded CALL_INSN_SIZE macro.

[ mingo: Refined the changelog ]

Fixes: 6256e668b7af ("x86/kprobes: Use int3 instead of debug trap for single-step")
Suggested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Jinke Han <jinkehan@didiglobal.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://patch.msgid.link/20260908073742.GA10517@didi-ThinkCentre-M920t-N000

1 files changed, 686 insertions, 0 deletions

diff --git a/arch/sparc/lib/U1memcpy.S b/arch/sparc/lib/U1memcpy.S
new file mode 100644
index 000000000..154fbd354
--- /dev/null
+++ b/arch/sparc/lib/U1memcpy.S
@@ -0,0 +1,686 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* U1memcpy.S: UltraSPARC-I/II/IIi/IIe optimized memcpy.
+ *
+ * Copyright (C) 1997, 2004 David S. Miller (davem@redhat.com)
+ * Copyright (C) 1996, 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz)
+ */
+
+#ifdef __KERNEL__
+#include <linux/export.h>
+#include <linux/linkage.h>
+#include <asm/visasm.h>
+#include <asm/asi.h>
+#define GLOBAL_SPARE	g7
+#else
+#define GLOBAL_SPARE	g5
+#define ASI_BLK_P 0xf0
+#define FPRS_FEF  0x04
+#ifdef MEMCPY_DEBUG
+#define VISEntry rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs; \
+		 clr %g1; clr %g2; clr %g3; subcc %g0, %g0, %g0;
+#define VISExit and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
+#else
+#define VISEntry rd %fprs, %o5; wr %g0, FPRS_FEF, %fprs
+#define VISExit and %o5, FPRS_FEF, %o5; wr %o5, 0x0, %fprs
+#endif
+#endif
+
+#ifndef EX_LD
+#define EX_LD(x,y)	x
+#endif
+#ifndef EX_LD_FP
+#define EX_LD_FP(x,y)	x
+#endif
+
+#ifndef EX_ST
+#define EX_ST(x,y)	x
+#endif
+#ifndef EX_ST_FP
+#define EX_ST_FP(x,y)	x
+#endif
+
+#ifndef LOAD
+#define LOAD(type,addr,dest)	type [addr], dest
+#endif
+
+#ifndef LOAD_BLK
+#define LOAD_BLK(addr,dest)	ldda [addr] ASI_BLK_P, dest
+#endif
+
+#ifndef STORE
+#define STORE(type,src,addr)	type src, [addr]
+#endif
+
+#ifndef STORE_BLK
+#define STORE_BLK(src,addr)	stda src, [addr] ASI_BLK_P
+#endif
+
+#ifndef FUNC_NAME
+#define FUNC_NAME	memcpy
+#endif
+
+#ifndef PREAMBLE
+#define PREAMBLE
+#endif
+
+#ifndef XCC
+#define XCC xcc
+#endif
+
+#define FREG_FROB(f1, f2, f3, f4, f5, f6, f7, f8, f9)		\
+	faligndata		%f1, %f2, %f48;			\
+	faligndata		%f2, %f3, %f50;			\
+	faligndata		%f3, %f4, %f52;			\
+	faligndata		%f4, %f5, %f54;			\
+	faligndata		%f5, %f6, %f56;			\
+	faligndata		%f6, %f7, %f58;			\
+	faligndata		%f7, %f8, %f60;			\
+	faligndata		%f8, %f9, %f62;
+
+#define MAIN_LOOP_CHUNK(src, dest, fdest, fsrc, jmptgt)			\
+	EX_LD_FP(LOAD_BLK(%src, %fdest), U1_gs_80_fp);			\
+	EX_ST_FP(STORE_BLK(%fsrc, %dest), U1_gs_80_fp);			\
+	add			%src, 0x40, %src;			\
+	subcc			%GLOBAL_SPARE, 0x40, %GLOBAL_SPARE;	\
+	be,pn			%xcc, jmptgt;				\
+	 add			%dest, 0x40, %dest;			\
+
+#define LOOP_CHUNK1(src, dest, branch_dest)		\
+	MAIN_LOOP_CHUNK(src, dest, f0,  f48, branch_dest)
+#define LOOP_CHUNK2(src, dest, branch_dest)		\
+	MAIN_LOOP_CHUNK(src, dest, f16, f48, branch_dest)
+#define LOOP_CHUNK3(src, dest, branch_dest)		\
+	MAIN_LOOP_CHUNK(src, dest, f32, f48, branch_dest)
+
+#define DO_SYNC			membar	#Sync;
+#define STORE_SYNC(dest, fsrc)				\
+	EX_ST_FP(STORE_BLK(%fsrc, %dest), U1_gs_80_fp);	\
+	add			%dest, 0x40, %dest;	\
+	DO_SYNC
+
+#define STORE_JUMP(dest, fsrc, target)			\
+	EX_ST_FP(STORE_BLK(%fsrc, %dest), U1_gs_40_fp);	\
+	add			%dest, 0x40, %dest;	\
+	ba,pt			%xcc, target;		\
+	 nop;
+
+#define FINISH_VISCHUNK(dest, f0, f1)			\
+	subcc			%g3, 8, %g3;		\
+	bl,pn			%xcc, 95f;		\
+	 faligndata		%f0, %f1, %f48;		\
+	EX_ST_FP(STORE(std, %f48, %dest), U1_g3_8_fp);	\
+	add			%dest, 8, %dest;
+
+#define UNEVEN_VISCHUNK_LAST(dest, f0, f1)	\
+	subcc			%g3, 8, %g3;	\
+	bl,pn			%xcc, 95f;	\
+	 fsrc2			%f0, %f1;
+
+#define UNEVEN_VISCHUNK(dest, f0, f1)		\
+	UNEVEN_VISCHUNK_LAST(dest, f0, f1)	\
+	ba,a,pt			%xcc, 93f;
+
+	.register	%g2,#scratch
+	.register	%g3,#scratch
+
+	.text
+#ifndef EX_RETVAL
+#define EX_RETVAL(x)	x
+ENTRY(U1_g1_1_fp)
+	VISExitHalf
+	add		%g1, 1, %g1
+	add		%g1, %g2, %g1
+	retl
+	 add		%g1, %o2, %o0
+ENDPROC(U1_g1_1_fp)
+ENTRY(U1_g2_0_fp)
+	VISExitHalf
+	retl
+	 add		%g2, %o2, %o0
+ENDPROC(U1_g2_0_fp)
+ENTRY(U1_g2_8_fp)
+	VISExitHalf
+	add		%g2, 8, %g2
+	retl
+	 add		%g2, %o2, %o0
+ENDPROC(U1_g2_8_fp)
+ENTRY(U1_gs_0_fp)
+	VISExitHalf
+	add		%GLOBAL_SPARE, %g3, %o0
+	retl
+	 add		%o0, %o2, %o0
+ENDPROC(U1_gs_0_fp)
+ENTRY(U1_gs_80_fp)
+	VISExitHalf
+	add		%GLOBAL_SPARE, 0x80, %GLOBAL_SPARE
+	add		%GLOBAL_SPARE, %g3, %o0
+	retl
+	 add		%o0, %o2, %o0
+ENDPROC(U1_gs_80_fp)
+ENTRY(U1_gs_40_fp)
+	VISExitHalf
+	add		%GLOBAL_SPARE, 0x40, %GLOBAL_SPARE
+	add		%GLOBAL_SPARE, %g3, %o0
+	retl
+	 add		%o0, %o2, %o0
+ENDPROC(U1_gs_40_fp)
+ENTRY(U1_g3_8_fp)
+	VISExitHalf
+	add		%g3, 8, %g3
+	retl
+	 add		%g3, %o2, %o0
+ENDPROC(U1_g3_8_fp)
+ENTRY(U1_g3_16_fp)
+	VISExitHalf
+	add		%g3, 16, %g3
+	retl
+	 add		%g3, %o2, %o0
+ENDPROC(U1_g3_16_fp)
+ENTRY(U1_o2_0_fp)
+	VISExitHalf
+	retl
+	 mov		%o2, %o0
+ENDPROC(U1_o2_0_fp)
+ENTRY(U1_o2_1_fp)
+	VISExitHalf
+	retl
+	 add		%o2, 1, %o0
+ENDPROC(U1_o2_1_fp)
+ENTRY(U1_gs_0)
+	VISExitHalf
+	retl
+	 add		%GLOBAL_SPARE, %o2, %o0
+ENDPROC(U1_gs_0)
+ENTRY(U1_gs_8)
+	VISExitHalf
+	add		%GLOBAL_SPARE, %o2, %GLOBAL_SPARE
+	retl
+	 add		%GLOBAL_SPARE, 0x8, %o0
+ENDPROC(U1_gs_8)
+ENTRY(U1_gs_10)
+	VISExitHalf
+	add		%GLOBAL_SPARE, %o2, %GLOBAL_SPARE
+	retl
+	 add		%GLOBAL_SPARE, 0x10, %o0
+ENDPROC(U1_gs_10)
+ENTRY(U1_o2_0)
+	retl
+	 mov		%o2, %o0
+ENDPROC(U1_o2_0)
+ENTRY(U1_o2_8)
+	retl
+	 add		%o2, 8, %o0
+ENDPROC(U1_o2_8)
+ENTRY(U1_o2_4)
+	retl
+	 add		%o2, 4, %o0
+ENDPROC(U1_o2_4)
+ENTRY(U1_o2_1)
+	retl
+	 add		%o2, 1, %o0
+ENDPROC(U1_o2_1)
+ENTRY(U1_g1_0)
+	retl
+	 add		%g1, %o2, %o0
+ENDPROC(U1_g1_0)
+ENTRY(U1_g1_1)
+	add		%g1, 1, %g1
+	retl
+	 add		%g1, %o2, %o0
+ENDPROC(U1_g1_1)
+ENTRY(U1_gs_0_o2_adj)
+	and		%o2, 7, %o2
+	retl
+	 add		%GLOBAL_SPARE, %o2, %o0
+ENDPROC(U1_gs_0_o2_adj)
+ENTRY(U1_gs_8_o2_adj)
+	and		%o2, 7, %o2
+	add		%GLOBAL_SPARE, 8, %GLOBAL_SPARE
+	retl
+	 add		%GLOBAL_SPARE, %o2, %o0
+ENDPROC(U1_gs_8_o2_adj)
+#endif
+
+	.align		64
+
+	.globl		FUNC_NAME
+	.type		FUNC_NAME,#function
+FUNC_NAME:		/* %o0=dst, %o1=src, %o2=len */
+	srlx		%o2, 31, %g2
+	cmp		%g2, 0
+	tne		%xcc, 5
+	PREAMBLE
+	mov		%o0, %o4
+	cmp		%o2, 0
+	be,pn		%XCC, 85f
+	 or		%o0, %o1, %o3
+	cmp		%o2, 16
+	blu,a,pn	%XCC, 80f
+	 or		%o3, %o2, %o3
+
+	cmp		%o2, (5 * 64)
+	blu,pt		%XCC, 70f
+	 andcc		%o3, 0x7, %g0
+
+	/* Clobbers o5/g1/g2/g3/g7/icc/xcc.  */
+	VISEntry
+
+	/* Is 'dst' already aligned on an 64-byte boundary? */
+	andcc		%o0, 0x3f, %g2
+	be,pt		%XCC, 2f
+
+	/* Compute abs((dst & 0x3f) - 0x40) into %g2.  This is the number
+	 * of bytes to copy to make 'dst' 64-byte aligned.  We pre-
+	 * subtract this from 'len'.
+	 */
+	 sub		%o0, %o1, %GLOBAL_SPARE
+	sub		%g2, 0x40, %g2
+	sub		%g0, %g2, %g2
+	sub		%o2, %g2, %o2
+	andcc		%g2, 0x7, %g1
+	be,pt		%icc, 2f
+	 and		%g2, 0x38, %g2
+
+1:	subcc		%g1, 0x1, %g1
+	EX_LD_FP(LOAD(ldub, %o1 + 0x00, %o3), U1_g1_1_fp)
+	EX_ST_FP(STORE(stb, %o3, %o1 + %GLOBAL_SPARE), U1_g1_1_fp)
+	bgu,pt		%XCC, 1b
+	 add		%o1, 0x1, %o1
+
+	add		%o1, %GLOBAL_SPARE, %o0
+
+2:	cmp		%g2, 0x0
+	and		%o1, 0x7, %g1
+	be,pt		%icc, 3f
+	 alignaddr	%o1, %g0, %o1
+
+	EX_LD_FP(LOAD(ldd, %o1, %f4), U1_g2_0_fp)
+1:	EX_LD_FP(LOAD(ldd, %o1 + 0x8, %f6), U1_g2_0_fp)
+	add		%o1, 0x8, %o1
+	subcc		%g2, 0x8, %g2
+	faligndata	%f4, %f6, %f0
+	EX_ST_FP(STORE(std, %f0, %o0), U1_g2_8_fp)
+	be,pn		%icc, 3f
+	 add		%o0, 0x8, %o0
+
+	EX_LD_FP(LOAD(ldd, %o1 + 0x8, %f4), U1_g2_0_fp)
+	add		%o1, 0x8, %o1
+	subcc		%g2, 0x8, %g2
+	faligndata	%f6, %f4, %f0
+	EX_ST_FP(STORE(std, %f0, %o0), U1_g2_8_fp)
+	bne,pt		%icc, 1b
+	 add		%o0, 0x8, %o0
+
+	/* Destination is 64-byte aligned.  */
+3:	
+	membar		  #LoadStore | #StoreStore | #StoreLoad
+
+	subcc		%o2, 0x40, %GLOBAL_SPARE
+	add		%o1, %g1, %g1
+	andncc		%GLOBAL_SPARE, (0x40 - 1), %GLOBAL_SPARE
+	srl		%g1, 3, %g2
+	sub		%o2, %GLOBAL_SPARE, %g3
+	andn		%o1, (0x40 - 1), %o1
+	and		%g2, 7, %g2
+	andncc		%g3, 0x7, %g3
+	fsrc2		%f0, %f2
+	sub		%g3, 0x8, %g3
+	sub		%o2, %GLOBAL_SPARE, %o2
+
+	add		%g1, %GLOBAL_SPARE, %g1
+	subcc		%o2, %g3, %o2
+
+	EX_LD_FP(LOAD_BLK(%o1, %f0), U1_gs_0_fp)
+	add		%o1, 0x40, %o1
+	add		%g1, %g3, %g1
+	EX_LD_FP(LOAD_BLK(%o1, %f16), U1_gs_0_fp)
+	add		%o1, 0x40, %o1
+	sub		%GLOBAL_SPARE, 0x80, %GLOBAL_SPARE
+	EX_LD_FP(LOAD_BLK(%o1, %f32), U1_gs_80_fp)
+	add		%o1, 0x40, %o1
+
+	/* There are 8 instances of the unrolled loop,
+	 * one for each possible alignment of the
+	 * source buffer.  Each loop instance is 452
+	 * bytes.
+	 */
+	sll		%g2, 3, %o3
+	sub		%o3, %g2, %o3
+	sllx		%o3, 4, %o3
+	add		%o3, %g2, %o3
+	sllx		%o3, 2, %g2
+1:	rd		%pc, %o3
+	add		%o3, %lo(1f - 1b), %o3
+	jmpl		%o3 + %g2, %g0
+	 nop
+
+	.align		64
+1:	FREG_FROB(f0, f2, f4, f6, f8, f10,f12,f14,f16)
+	LOOP_CHUNK1(o1, o0, 1f)
+	FREG_FROB(f16,f18,f20,f22,f24,f26,f28,f30,f32)
+	LOOP_CHUNK2(o1, o0, 2f)
+	FREG_FROB(f32,f34,f36,f38,f40,f42,f44,f46,f0)
+	LOOP_CHUNK3(o1, o0, 3f)
+	ba,pt		%xcc, 1b+4
+	 faligndata	%f0, %f2, %f48
+1:	FREG_FROB(f16,f18,f20,f22,f24,f26,f28,f30,f32)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f32,f34,f36,f38,f40,f42,f44,f46,f0)
+	STORE_JUMP(o0, f48, 40f)
+2:	FREG_FROB(f32,f34,f36,f38,f40,f42,f44,f46,f0)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f0, f2, f4, f6, f8, f10,f12,f14,f16)
+	STORE_JUMP(o0, f48, 48f)
+3:	FREG_FROB(f0, f2, f4, f6, f8, f10,f12,f14,f16)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f16,f18,f20,f22,f24,f26,f28,f30,f32)
+	STORE_JUMP(o0, f48, 56f)
+
+1:	FREG_FROB(f2, f4, f6, f8, f10,f12,f14,f16,f18)
+	LOOP_CHUNK1(o1, o0, 1f)
+	FREG_FROB(f18,f20,f22,f24,f26,f28,f30,f32,f34)
+	LOOP_CHUNK2(o1, o0, 2f)
+	FREG_FROB(f34,f36,f38,f40,f42,f44,f46,f0, f2)
+	LOOP_CHUNK3(o1, o0, 3f)
+	ba,pt		%xcc, 1b+4
+	 faligndata	%f2, %f4, %f48
+1:	FREG_FROB(f18,f20,f22,f24,f26,f28,f30,f32,f34)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f34,f36,f38,f40,f42,f44,f46,f0, f2)
+	STORE_JUMP(o0, f48, 41f)
+2:	FREG_FROB(f34,f36,f38,f40,f42,f44,f46,f0, f2)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f2, f4, f6, f8, f10,f12,f14,f16,f18)
+	STORE_JUMP(o0, f48, 49f)
+3:	FREG_FROB(f2, f4, f6, f8, f10,f12,f14,f16,f18)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f18,f20,f22,f24,f26,f28,f30,f32,f34)
+	STORE_JUMP(o0, f48, 57f)
+
+1:	FREG_FROB(f4, f6, f8, f10,f12,f14,f16,f18,f20)
+	LOOP_CHUNK1(o1, o0, 1f)
+	FREG_FROB(f20,f22,f24,f26,f28,f30,f32,f34,f36)
+	LOOP_CHUNK2(o1, o0, 2f)
+	FREG_FROB(f36,f38,f40,f42,f44,f46,f0, f2, f4)
+	LOOP_CHUNK3(o1, o0, 3f)
+	ba,pt		%xcc, 1b+4
+	 faligndata	%f4, %f6, %f48
+1:	FREG_FROB(f20,f22,f24,f26,f28,f30,f32,f34,f36)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f36,f38,f40,f42,f44,f46,f0, f2, f4)
+	STORE_JUMP(o0, f48, 42f)
+2:	FREG_FROB(f36,f38,f40,f42,f44,f46,f0, f2, f4)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f4, f6, f8, f10,f12,f14,f16,f18,f20)
+	STORE_JUMP(o0, f48, 50f)
+3:	FREG_FROB(f4, f6, f8, f10,f12,f14,f16,f18,f20)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f20,f22,f24,f26,f28,f30,f32,f34,f36)
+	STORE_JUMP(o0, f48, 58f)
+
+1:	FREG_FROB(f6, f8, f10,f12,f14,f16,f18,f20,f22)
+	LOOP_CHUNK1(o1, o0, 1f)
+	FREG_FROB(f22,f24,f26,f28,f30,f32,f34,f36,f38)
+	LOOP_CHUNK2(o1, o0, 2f)
+	FREG_FROB(f38,f40,f42,f44,f46,f0, f2, f4, f6) 
+	LOOP_CHUNK3(o1, o0, 3f)
+	ba,pt		%xcc, 1b+4
+	 faligndata	%f6, %f8, %f48
+1:	FREG_FROB(f22,f24,f26,f28,f30,f32,f34,f36,f38)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f38,f40,f42,f44,f46,f0, f2, f4, f6)
+	STORE_JUMP(o0, f48, 43f)
+2:	FREG_FROB(f38,f40,f42,f44,f46,f0, f2, f4, f6)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f6, f8, f10,f12,f14,f16,f18,f20,f22)
+	STORE_JUMP(o0, f48, 51f)
+3:	FREG_FROB(f6, f8, f10,f12,f14,f16,f18,f20,f22)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f22,f24,f26,f28,f30,f32,f34,f36,f38)
+	STORE_JUMP(o0, f48, 59f)
+
+1:	FREG_FROB(f8, f10,f12,f14,f16,f18,f20,f22,f24)
+	LOOP_CHUNK1(o1, o0, 1f)
+	FREG_FROB(f24,f26,f28,f30,f32,f34,f36,f38,f40)
+	LOOP_CHUNK2(o1, o0, 2f)
+	FREG_FROB(f40,f42,f44,f46,f0, f2, f4, f6, f8)
+	LOOP_CHUNK3(o1, o0, 3f)
+	ba,pt		%xcc, 1b+4
+	 faligndata	%f8, %f10, %f48
+1:	FREG_FROB(f24,f26,f28,f30,f32,f34,f36,f38,f40)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f40,f42,f44,f46,f0, f2, f4, f6, f8)
+	STORE_JUMP(o0, f48, 44f)
+2:	FREG_FROB(f40,f42,f44,f46,f0, f2, f4, f6, f8)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f8, f10,f12,f14,f16,f18,f20,f22,f24)
+	STORE_JUMP(o0, f48, 52f)
+3:	FREG_FROB(f8, f10,f12,f14,f16,f18,f20,f22,f24)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f24,f26,f28,f30,f32,f34,f36,f38,f40)
+	STORE_JUMP(o0, f48, 60f)
+
+1:	FREG_FROB(f10,f12,f14,f16,f18,f20,f22,f24,f26)
+	LOOP_CHUNK1(o1, o0, 1f)
+	FREG_FROB(f26,f28,f30,f32,f34,f36,f38,f40,f42)
+	LOOP_CHUNK2(o1, o0, 2f)
+	FREG_FROB(f42,f44,f46,f0, f2, f4, f6, f8, f10)
+	LOOP_CHUNK3(o1, o0, 3f)
+	ba,pt		%xcc, 1b+4
+	 faligndata	%f10, %f12, %f48
+1:	FREG_FROB(f26,f28,f30,f32,f34,f36,f38,f40,f42)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f42,f44,f46,f0, f2, f4, f6, f8, f10)
+	STORE_JUMP(o0, f48, 45f)
+2:	FREG_FROB(f42,f44,f46,f0, f2, f4, f6, f8, f10)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f10,f12,f14,f16,f18,f20,f22,f24,f26)
+	STORE_JUMP(o0, f48, 53f)
+3:	FREG_FROB(f10,f12,f14,f16,f18,f20,f22,f24,f26)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f26,f28,f30,f32,f34,f36,f38,f40,f42)
+	STORE_JUMP(o0, f48, 61f)
+
+1:	FREG_FROB(f12,f14,f16,f18,f20,f22,f24,f26,f28)
+	LOOP_CHUNK1(o1, o0, 1f)
+	FREG_FROB(f28,f30,f32,f34,f36,f38,f40,f42,f44)
+	LOOP_CHUNK2(o1, o0, 2f)
+	FREG_FROB(f44,f46,f0, f2, f4, f6, f8, f10,f12)
+	LOOP_CHUNK3(o1, o0, 3f)
+	ba,pt		%xcc, 1b+4
+	 faligndata	%f12, %f14, %f48
+1:	FREG_FROB(f28,f30,f32,f34,f36,f38,f40,f42,f44)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f44,f46,f0, f2, f4, f6, f8, f10,f12)
+	STORE_JUMP(o0, f48, 46f)
+2:	FREG_FROB(f44,f46,f0, f2, f4, f6, f8, f10,f12)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f12,f14,f16,f18,f20,f22,f24,f26,f28)
+	STORE_JUMP(o0, f48, 54f)
+3:	FREG_FROB(f12,f14,f16,f18,f20,f22,f24,f26,f28)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f28,f30,f32,f34,f36,f38,f40,f42,f44)
+	STORE_JUMP(o0, f48, 62f)
+
+1:	FREG_FROB(f14,f16,f18,f20,f22,f24,f26,f28,f30)
+	LOOP_CHUNK1(o1, o0, 1f)
+	FREG_FROB(f30,f32,f34,f36,f38,f40,f42,f44,f46)
+	LOOP_CHUNK2(o1, o0, 2f)
+	FREG_FROB(f46,f0, f2, f4, f6, f8, f10,f12,f14)
+	LOOP_CHUNK3(o1, o0, 3f)
+	ba,pt		%xcc, 1b+4
+	 faligndata	%f14, %f16, %f48
+1:	FREG_FROB(f30,f32,f34,f36,f38,f40,f42,f44,f46)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f46,f0, f2, f4, f6, f8, f10,f12,f14)
+	STORE_JUMP(o0, f48, 47f)
+2:	FREG_FROB(f46,f0, f2, f4, f6, f8, f10,f12,f14)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f14,f16,f18,f20,f22,f24,f26,f28,f30)
+	STORE_JUMP(o0, f48, 55f)
+3:	FREG_FROB(f14,f16,f18,f20,f22,f24,f26,f28,f30)
+	STORE_SYNC(o0, f48)
+	FREG_FROB(f30,f32,f34,f36,f38,f40,f42,f44,f46)
+	STORE_JUMP(o0, f48, 63f)
+
+40:	FINISH_VISCHUNK(o0, f0,  f2)
+41:	FINISH_VISCHUNK(o0, f2,  f4)
+42:	FINISH_VISCHUNK(o0, f4,  f6)
+43:	FINISH_VISCHUNK(o0, f6,  f8)
+44:	FINISH_VISCHUNK(o0, f8,  f10)
+45:	FINISH_VISCHUNK(o0, f10, f12)
+46:	FINISH_VISCHUNK(o0, f12, f14)
+47:	UNEVEN_VISCHUNK(o0, f14, f0)
+48:	FINISH_VISCHUNK(o0, f16, f18)
+49:	FINISH_VISCHUNK(o0, f18, f20)
+50:	FINISH_VISCHUNK(o0, f20, f22)
+51:	FINISH_VISCHUNK(o0, f22, f24)
+52:	FINISH_VISCHUNK(o0, f24, f26)
+53:	FINISH_VISCHUNK(o0, f26, f28)
+54:	FINISH_VISCHUNK(o0, f28, f30)
+55:	UNEVEN_VISCHUNK(o0, f30, f0)
+56:	FINISH_VISCHUNK(o0, f32, f34)
+57:	FINISH_VISCHUNK(o0, f34, f36)
+58:	FINISH_VISCHUNK(o0, f36, f38)
+59:	FINISH_VISCHUNK(o0, f38, f40)
+60:	FINISH_VISCHUNK(o0, f40, f42)
+61:	FINISH_VISCHUNK(o0, f42, f44)
+62:	FINISH_VISCHUNK(o0, f44, f46)
+63:	UNEVEN_VISCHUNK_LAST(o0, f46, f0)
+
+93:	EX_LD_FP(LOAD(ldd, %o1, %f2), U1_g3_8_fp)
+	add		%o1, 8, %o1
+	subcc		%g3, 8, %g3
+	faligndata	%f0, %f2, %f8
+	EX_ST_FP(STORE(std, %f8, %o0), U1_g3_16_fp)
+	bl,pn		%xcc, 95f
+	 add		%o0, 8, %o0
+	EX_LD_FP(LOAD(ldd, %o1, %f0), U1_g3_8_fp)
+	add		%o1, 8, %o1
+	subcc		%g3, 8, %g3
+	faligndata	%f2, %f0, %f8
+	EX_ST_FP(STORE(std, %f8, %o0), U1_g3_16_fp)
+	bge,pt		%xcc, 93b
+	 add		%o0, 8, %o0
+
+95:	brz,pt		%o2, 2f
+	 mov		%g1, %o1
+
+1:	EX_LD_FP(LOAD(ldub, %o1, %o3), U1_o2_0_fp)
+	add		%o1, 1, %o1
+	subcc		%o2, 1, %o2
+	EX_ST_FP(STORE(stb, %o3, %o0), U1_o2_1_fp)
+	bne,pt		%xcc, 1b
+	 add		%o0, 1, %o0
+
+2:	membar		#StoreLoad | #StoreStore
+	VISExit
+	retl
+	 mov		EX_RETVAL(%o4), %o0
+
+	.align		64
+70:	/* 16 < len <= (5 * 64) */
+	bne,pn		%XCC, 75f
+	 sub		%o0, %o1, %o3
+
+72:	andn		%o2, 0xf, %GLOBAL_SPARE
+	and		%o2, 0xf, %o2
+1:	EX_LD(LOAD(ldx, %o1 + 0x00, %o5), U1_gs_0)
+	EX_LD(LOAD(ldx, %o1 + 0x08, %g1), U1_gs_0)
+	subcc		%GLOBAL_SPARE, 0x10, %GLOBAL_SPARE
+	EX_ST(STORE(stx, %o5, %o1 + %o3), U1_gs_10)
+	add		%o1, 0x8, %o1
+	EX_ST(STORE(stx, %g1, %o1 + %o3), U1_gs_8)
+	bgu,pt		%XCC, 1b
+	 add		%o1, 0x8, %o1
+73:	andcc		%o2, 0x8, %g0
+	be,pt		%XCC, 1f
+	 nop
+	EX_LD(LOAD(ldx, %o1, %o5), U1_o2_0)
+	sub		%o2, 0x8, %o2
+	EX_ST(STORE(stx, %o5, %o1 + %o3), U1_o2_8)
+	add		%o1, 0x8, %o1
+1:	andcc		%o2, 0x4, %g0
+	be,pt		%XCC, 1f
+	 nop
+	EX_LD(LOAD(lduw, %o1, %o5), U1_o2_0)
+	sub		%o2, 0x4, %o2
+	EX_ST(STORE(stw, %o5, %o1 + %o3), U1_o2_4)
+	add		%o1, 0x4, %o1
+1:	cmp		%o2, 0
+	be,pt		%XCC, 85f
+	 nop
+	ba,pt		%xcc, 90f
+	 nop
+
+75:	andcc		%o0, 0x7, %g1
+	sub		%g1, 0x8, %g1
+	be,pn		%icc, 2f
+	 sub		%g0, %g1, %g1
+	sub		%o2, %g1, %o2
+
+1:	EX_LD(LOAD(ldub, %o1, %o5), U1_g1_0)
+	subcc		%g1, 1, %g1
+	EX_ST(STORE(stb, %o5, %o1 + %o3), U1_g1_1)
+	bgu,pt		%icc, 1b
+	 add		%o1, 1, %o1
+
+2:	add		%o1, %o3, %o0
+	andcc		%o1, 0x7, %g1
+	bne,pt		%icc, 8f
+	 sll		%g1, 3, %g1
+
+	cmp		%o2, 16
+	bgeu,pt		%icc, 72b
+	 nop
+	ba,a,pt		%xcc, 73b
+
+8:	mov		64, %o3
+	andn		%o1, 0x7, %o1
+	EX_LD(LOAD(ldx, %o1, %g2), U1_o2_0)
+	sub		%o3, %g1, %o3
+	andn		%o2, 0x7, %GLOBAL_SPARE
+	sllx		%g2, %g1, %g2
+1:	EX_LD(LOAD(ldx, %o1 + 0x8, %g3), U1_gs_0_o2_adj)
+	subcc		%GLOBAL_SPARE, 0x8, %GLOBAL_SPARE
+	add		%o1, 0x8, %o1
+	srlx		%g3, %o3, %o5
+	or		%o5, %g2, %o5
+	EX_ST(STORE(stx, %o5, %o0), U1_gs_8_o2_adj)
+	add		%o0, 0x8, %o0
+	bgu,pt		%icc, 1b
+	 sllx		%g3, %g1, %g2
+
+	srl		%g1, 3, %g1
+	andcc		%o2, 0x7, %o2
+	be,pn		%icc, 85f
+	 add		%o1, %g1, %o1
+	ba,pt		%xcc, 90f
+	 sub		%o0, %o1, %o3
+
+	.align		64
+80:	/* 0 < len <= 16 */
+	andcc		%o3, 0x3, %g0
+	bne,pn		%XCC, 90f
+	 sub		%o0, %o1, %o3
+
+1:	EX_LD(LOAD(lduw, %o1, %g1), U1_o2_0)
+	subcc		%o2, 4, %o2
+	EX_ST(STORE(stw, %g1, %o1 + %o3), U1_o2_4)
+	bgu,pt		%XCC, 1b
+	 add		%o1, 4, %o1
+
+85:	retl
+	 mov		EX_RETVAL(%o4), %o0
+
+	.align		32
+90:	EX_LD(LOAD(ldub, %o1, %g1), U1_o2_0)
+	subcc		%o2, 1, %o2
+	EX_ST(STORE(stb, %g1, %o1 + %o3), U1_o2_1)
+	bgu,pt		%XCC, 90b
+	 add		%o1, 1, %o1
+	retl
+	 mov		EX_RETVAL(%o4), %o0
+
+	.size		FUNC_NAME, .-FUNC_NAME
+EXPORT_SYMBOL(FUNC_NAME)