[PATCH] powerpc: fix invalid use of register expressions

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[PATCH] powerpc: fix invalid use of register expressions

Andreas Schwab-2
binutils >= 2.26 now warns about misuse of register expressions in
assembler operands that are actually literals, for example:

arch/powerpc/kernel/entry_64.S:535: Warning: invalid register expression

Signed-off-by: Andreas Schwab <[hidden email]>
---
 arch/powerpc/include/asm/ppc_asm.h |  2 +-
 arch/powerpc/kernel/swsusp_asm64.S |  2 +-
 arch/powerpc/kvm/book3s_64_slb.S   |  2 +-
 arch/powerpc/lib/copypage_power7.S | 14 ++++----
 arch/powerpc/lib/copyuser_power7.S | 66 +++++++++++++++++++-------------------
 arch/powerpc/lib/memcpy_power7.S   | 66 +++++++++++++++++++-------------------
 arch/powerpc/lib/string_64.S       |  2 +-
 7 files changed, 77 insertions(+), 77 deletions(-)

diff --git a/arch/powerpc/include/asm/ppc_asm.h b/arch/powerpc/include/asm/ppc_asm.h
index 6baeeb9acd..daeda2bbe1 100644
--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -439,7 +439,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
 .machine push ; \
 .machine "power4" ; \
        lis     scratch,0x60000000@h; \
-       dcbt    r0,scratch,0b01010; \
+       dcbt    0,scratch,0b01010; \
 .machine pop
 
 /*
diff --git a/arch/powerpc/kernel/swsusp_asm64.S b/arch/powerpc/kernel/swsusp_asm64.S
index 988f38dced..82d8aae81c 100644
--- a/arch/powerpc/kernel/swsusp_asm64.S
+++ b/arch/powerpc/kernel/swsusp_asm64.S
@@ -179,7 +179,7 @@ nothing_to_copy:
  sld r3, r3, r0
  li r0, 0
 1:
- dcbf r0,r3
+ dcbf 0,r3
  addi r3,r3,0x20
  bdnz 1b
 
diff --git a/arch/powerpc/kvm/book3s_64_slb.S b/arch/powerpc/kvm/book3s_64_slb.S
index 3589c4e3d4..688722acd6 100644
--- a/arch/powerpc/kvm/book3s_64_slb.S
+++ b/arch/powerpc/kvm/book3s_64_slb.S
@@ -113,7 +113,7 @@ slb_do_enter:
 
  /* Remove all SLB entries that are in use. */
 
- li r0, r0
+ li r0, 0
  slbmte r0, r0
  slbia
 
diff --git a/arch/powerpc/lib/copypage_power7.S b/arch/powerpc/lib/copypage_power7.S
index a84d333ecb..ca5fc8fa7e 100644
--- a/arch/powerpc/lib/copypage_power7.S
+++ b/arch/powerpc/lib/copypage_power7.S
@@ -45,13 +45,13 @@ _GLOBAL(copypage_power7)
 .machine push
 .machine "power4"
  /* setup read stream 0  */
- dcbt r0,r4,0b01000   /* addr from */
- dcbt r0,r7,0b01010   /* length and depth from */
+ dcbt 0,r4,0b01000   /* addr from */
+ dcbt 0,r7,0b01010   /* length and depth from */
  /* setup write stream 1 */
- dcbtst r0,r9,0b01000   /* addr to */
- dcbtst r0,r10,0b01010  /* length and depth to */
+ dcbtst 0,r9,0b01000   /* addr to */
+ dcbtst 0,r10,0b01010  /* length and depth to */
  eieio
- dcbt r0,r8,0b01010 /* all streams GO */
+ dcbt 0,r8,0b01010 /* all streams GO */
 .machine pop
 
 #ifdef CONFIG_ALTIVEC
@@ -83,7 +83,7 @@ _GLOBAL(copypage_power7)
  li r12,112
 
  .align 5
-1: lvx v7,r0,r4
+1: lvx v7,0,r4
  lvx v6,r4,r6
  lvx v5,r4,r7
  lvx v4,r4,r8
@@ -92,7 +92,7 @@ _GLOBAL(copypage_power7)
  lvx v1,r4,r11
  lvx v0,r4,r12
  addi r4,r4,128
- stvx v7,r0,r3
+ stvx v7,0,r3
  stvx v6,r3,r6
  stvx v5,r3,r7
  stvx v4,r3,r8
diff --git a/arch/powerpc/lib/copyuser_power7.S b/arch/powerpc/lib/copyuser_power7.S
index 706b7cc198..d416a4a665 100644
--- a/arch/powerpc/lib/copyuser_power7.S
+++ b/arch/powerpc/lib/copyuser_power7.S
@@ -315,13 +315,13 @@ err1; stb r0,0(r3)
 .machine push
 .machine "power4"
  /* setup read stream 0 */
- dcbt r0,r6,0b01000   /* addr from */
- dcbt r0,r7,0b01010   /* length and depth from */
+ dcbt 0,r6,0b01000   /* addr from */
+ dcbt 0,r7,0b01010   /* length and depth from */
  /* setup write stream 1 */
- dcbtst r0,r9,0b01000   /* addr to */
- dcbtst r0,r10,0b01010  /* length and depth to */
+ dcbtst 0,r9,0b01000   /* addr to */
+ dcbtst 0,r10,0b01010  /* length and depth to */
  eieio
- dcbt r0,r8,0b01010 /* all streams GO */
+ dcbt 0,r8,0b01010 /* all streams GO */
 .machine pop
 
  beq cr1,.Lunwind_stack_nonvmx_copy
@@ -376,26 +376,26 @@ err3; std r0,0(r3)
  li r11,48
 
  bf cr7*4+3,5f
-err3; lvx v1,r0,r4
+err3; lvx v1,0,r4
  addi r4,r4,16
-err3; stvx v1,r0,r3
+err3; stvx v1,0,r3
  addi r3,r3,16
 
 5: bf cr7*4+2,6f
-err3; lvx v1,r0,r4
+err3; lvx v1,0,r4
 err3; lvx v0,r4,r9
  addi r4,r4,32
-err3; stvx v1,r0,r3
+err3; stvx v1,0,r3
 err3; stvx v0,r3,r9
  addi r3,r3,32
 
 6: bf cr7*4+1,7f
-err3; lvx v3,r0,r4
+err3; lvx v3,0,r4
 err3; lvx v2,r4,r9
 err3; lvx v1,r4,r10
 err3; lvx v0,r4,r11
  addi r4,r4,64
-err3; stvx v3,r0,r3
+err3; stvx v3,0,r3
 err3; stvx v2,r3,r9
 err3; stvx v1,r3,r10
 err3; stvx v0,r3,r11
@@ -421,7 +421,7 @@ err3; stvx v0,r3,r11
  */
  .align 5
 8:
-err4; lvx v7,r0,r4
+err4; lvx v7,0,r4
 err4; lvx v6,r4,r9
 err4; lvx v5,r4,r10
 err4; lvx v4,r4,r11
@@ -430,7 +430,7 @@ err4; lvx v2,r4,r14
 err4; lvx v1,r4,r15
 err4; lvx v0,r4,r16
  addi r4,r4,128
-err4; stvx v7,r0,r3
+err4; stvx v7,0,r3
 err4; stvx v6,r3,r9
 err4; stvx v5,r3,r10
 err4; stvx v4,r3,r11
@@ -451,29 +451,29 @@ err4; stvx v0,r3,r16
  mtocrf 0x01,r6
 
  bf cr7*4+1,9f
-err3; lvx v3,r0,r4
+err3; lvx v3,0,r4
 err3; lvx v2,r4,r9
 err3; lvx v1,r4,r10
 err3; lvx v0,r4,r11
  addi r4,r4,64
-err3; stvx v3,r0,r3
+err3; stvx v3,0,r3
 err3; stvx v2,r3,r9
 err3; stvx v1,r3,r10
 err3; stvx v0,r3,r11
  addi r3,r3,64
 
 9: bf cr7*4+2,10f
-err3; lvx v1,r0,r4
+err3; lvx v1,0,r4
 err3; lvx v0,r4,r9
  addi r4,r4,32
-err3; stvx v1,r0,r3
+err3; stvx v1,0,r3
 err3; stvx v0,r3,r9
  addi r3,r3,32
 
 10: bf cr7*4+3,11f
-err3; lvx v1,r0,r4
+err3; lvx v1,0,r4
  addi r4,r4,16
-err3; stvx v1,r0,r3
+err3; stvx v1,0,r3
  addi r3,r3,16
 
  /* Up to 15B to go */
@@ -553,25 +553,25 @@ err3; lvx v0,0,r4
  addi r4,r4,16
 
  bf cr7*4+3,5f
-err3; lvx v1,r0,r4
+err3; lvx v1,0,r4
  VPERM(v8,v0,v1,v16)
  addi r4,r4,16
-err3; stvx v8,r0,r3
+err3; stvx v8,0,r3
  addi r3,r3,16
  vor v0,v1,v1
 
 5: bf cr7*4+2,6f
-err3; lvx v1,r0,r4
+err3; lvx v1,0,r4
  VPERM(v8,v0,v1,v16)
 err3; lvx v0,r4,r9
  VPERM(v9,v1,v0,v16)
  addi r4,r4,32
-err3; stvx v8,r0,r3
+err3; stvx v8,0,r3
 err3; stvx v9,r3,r9
  addi r3,r3,32
 
 6: bf cr7*4+1,7f
-err3; lvx v3,r0,r4
+err3; lvx v3,0,r4
  VPERM(v8,v0,v3,v16)
 err3; lvx v2,r4,r9
  VPERM(v9,v3,v2,v16)
@@ -580,7 +580,7 @@ err3; lvx v1,r4,r10
 err3; lvx v0,r4,r11
  VPERM(v11,v1,v0,v16)
  addi r4,r4,64
-err3; stvx v8,r0,r3
+err3; stvx v8,0,r3
 err3; stvx v9,r3,r9
 err3; stvx v10,r3,r10
 err3; stvx v11,r3,r11
@@ -606,7 +606,7 @@ err3; stvx v11,r3,r11
  */
  .align 5
 8:
-err4; lvx v7,r0,r4
+err4; lvx v7,0,r4
  VPERM(v8,v0,v7,v16)
 err4; lvx v6,r4,r9
  VPERM(v9,v7,v6,v16)
@@ -623,7 +623,7 @@ err4; lvx v1,r4,r15
 err4; lvx v0,r4,r16
  VPERM(v15,v1,v0,v16)
  addi r4,r4,128
-err4; stvx v8,r0,r3
+err4; stvx v8,0,r3
 err4; stvx v9,r3,r9
 err4; stvx v10,r3,r10
 err4; stvx v11,r3,r11
@@ -644,7 +644,7 @@ err4; stvx v15,r3,r16
  mtocrf 0x01,r6
 
  bf cr7*4+1,9f
-err3; lvx v3,r0,r4
+err3; lvx v3,0,r4
  VPERM(v8,v0,v3,v16)
 err3; lvx v2,r4,r9
  VPERM(v9,v3,v2,v16)
@@ -653,27 +653,27 @@ err3; lvx v1,r4,r10
 err3; lvx v0,r4,r11
  VPERM(v11,v1,v0,v16)
  addi r4,r4,64
-err3; stvx v8,r0,r3
+err3; stvx v8,0,r3
 err3; stvx v9,r3,r9
 err3; stvx v10,r3,r10
 err3; stvx v11,r3,r11
  addi r3,r3,64
 
 9: bf cr7*4+2,10f
-err3; lvx v1,r0,r4
+err3; lvx v1,0,r4
  VPERM(v8,v0,v1,v16)
 err3; lvx v0,r4,r9
  VPERM(v9,v1,v0,v16)
  addi r4,r4,32
-err3; stvx v8,r0,r3
+err3; stvx v8,0,r3
 err3; stvx v9,r3,r9
  addi r3,r3,32
 
 10: bf cr7*4+3,11f
-err3; lvx v1,r0,r4
+err3; lvx v1,0,r4
  VPERM(v8,v0,v1,v16)
  addi r4,r4,16
-err3; stvx v8,r0,r3
+err3; stvx v8,0,r3
  addi r3,r3,16
 
  /* Up to 15B to go */
diff --git a/arch/powerpc/lib/memcpy_power7.S b/arch/powerpc/lib/memcpy_power7.S
index 786234fd4e..193909abd1 100644
--- a/arch/powerpc/lib/memcpy_power7.S
+++ b/arch/powerpc/lib/memcpy_power7.S
@@ -261,12 +261,12 @@ _GLOBAL(memcpy_power7)
 
 .machine push
 .machine "power4"
- dcbt r0,r6,0b01000
- dcbt r0,r7,0b01010
- dcbtst r0,r9,0b01000
- dcbtst r0,r10,0b01010
+ dcbt 0,r6,0b01000
+ dcbt 0,r7,0b01010
+ dcbtst 0,r9,0b01000
+ dcbtst 0,r10,0b01010
  eieio
- dcbt r0,r8,0b01010 /* GO */
+ dcbt 0,r8,0b01010 /* GO */
 .machine pop
 
  beq cr1,.Lunwind_stack_nonvmx_copy
@@ -321,26 +321,26 @@ _GLOBAL(memcpy_power7)
  li r11,48
 
  bf cr7*4+3,5f
- lvx v1,r0,r4
+ lvx v1,0,r4
  addi r4,r4,16
- stvx v1,r0,r3
+ stvx v1,0,r3
  addi r3,r3,16
 
 5: bf cr7*4+2,6f
- lvx v1,r0,r4
+ lvx v1,0,r4
  lvx v0,r4,r9
  addi r4,r4,32
- stvx v1,r0,r3
+ stvx v1,0,r3
  stvx v0,r3,r9
  addi r3,r3,32
 
 6: bf cr7*4+1,7f
- lvx v3,r0,r4
+ lvx v3,0,r4
  lvx v2,r4,r9
  lvx v1,r4,r10
  lvx v0,r4,r11
  addi r4,r4,64
- stvx v3,r0,r3
+ stvx v3,0,r3
  stvx v2,r3,r9
  stvx v1,r3,r10
  stvx v0,r3,r11
@@ -366,7 +366,7 @@ _GLOBAL(memcpy_power7)
  */
  .align 5
 8:
- lvx v7,r0,r4
+ lvx v7,0,r4
  lvx v6,r4,r9
  lvx v5,r4,r10
  lvx v4,r4,r11
@@ -375,7 +375,7 @@ _GLOBAL(memcpy_power7)
  lvx v1,r4,r15
  lvx v0,r4,r16
  addi r4,r4,128
- stvx v7,r0,r3
+ stvx v7,0,r3
  stvx v6,r3,r9
  stvx v5,r3,r10
  stvx v4,r3,r11
@@ -396,29 +396,29 @@ _GLOBAL(memcpy_power7)
  mtocrf 0x01,r6
 
  bf cr7*4+1,9f
- lvx v3,r0,r4
+ lvx v3,0,r4
  lvx v2,r4,r9
  lvx v1,r4,r10
  lvx v0,r4,r11
  addi r4,r4,64
- stvx v3,r0,r3
+ stvx v3,0,r3
  stvx v2,r3,r9
  stvx v1,r3,r10
  stvx v0,r3,r11
  addi r3,r3,64
 
 9: bf cr7*4+2,10f
- lvx v1,r0,r4
+ lvx v1,0,r4
  lvx v0,r4,r9
  addi r4,r4,32
- stvx v1,r0,r3
+ stvx v1,0,r3
  stvx v0,r3,r9
  addi r3,r3,32
 
 10: bf cr7*4+3,11f
- lvx v1,r0,r4
+ lvx v1,0,r4
  addi r4,r4,16
- stvx v1,r0,r3
+ stvx v1,0,r3
  addi r3,r3,16
 
  /* Up to 15B to go */
@@ -499,25 +499,25 @@ _GLOBAL(memcpy_power7)
  addi r4,r4,16
 
  bf cr7*4+3,5f
- lvx v1,r0,r4
+ lvx v1,0,r4
  VPERM(v8,v0,v1,v16)
  addi r4,r4,16
- stvx v8,r0,r3
+ stvx v8,0,r3
  addi r3,r3,16
  vor v0,v1,v1
 
 5: bf cr7*4+2,6f
- lvx v1,r0,r4
+ lvx v1,0,r4
  VPERM(v8,v0,v1,v16)
  lvx v0,r4,r9
  VPERM(v9,v1,v0,v16)
  addi r4,r4,32
- stvx v8,r0,r3
+ stvx v8,0,r3
  stvx v9,r3,r9
  addi r3,r3,32
 
 6: bf cr7*4+1,7f
- lvx v3,r0,r4
+ lvx v3,0,r4
  VPERM(v8,v0,v3,v16)
  lvx v2,r4,r9
  VPERM(v9,v3,v2,v16)
@@ -526,7 +526,7 @@ _GLOBAL(memcpy_power7)
  lvx v0,r4,r11
  VPERM(v11,v1,v0,v16)
  addi r4,r4,64
- stvx v8,r0,r3
+ stvx v8,0,r3
  stvx v9,r3,r9
  stvx v10,r3,r10
  stvx v11,r3,r11
@@ -552,7 +552,7 @@ _GLOBAL(memcpy_power7)
  */
  .align 5
 8:
- lvx v7,r0,r4
+ lvx v7,0,r4
  VPERM(v8,v0,v7,v16)
  lvx v6,r4,r9
  VPERM(v9,v7,v6,v16)
@@ -569,7 +569,7 @@ _GLOBAL(memcpy_power7)
  lvx v0,r4,r16
  VPERM(v15,v1,v0,v16)
  addi r4,r4,128
- stvx v8,r0,r3
+ stvx v8,0,r3
  stvx v9,r3,r9
  stvx v10,r3,r10
  stvx v11,r3,r11
@@ -590,7 +590,7 @@ _GLOBAL(memcpy_power7)
  mtocrf 0x01,r6
 
  bf cr7*4+1,9f
- lvx v3,r0,r4
+ lvx v3,0,r4
  VPERM(v8,v0,v3,v16)
  lvx v2,r4,r9
  VPERM(v9,v3,v2,v16)
@@ -599,27 +599,27 @@ _GLOBAL(memcpy_power7)
  lvx v0,r4,r11
  VPERM(v11,v1,v0,v16)
  addi r4,r4,64
- stvx v8,r0,r3
+ stvx v8,0,r3
  stvx v9,r3,r9
  stvx v10,r3,r10
  stvx v11,r3,r11
  addi r3,r3,64
 
 9: bf cr7*4+2,10f
- lvx v1,r0,r4
+ lvx v1,0,r4
  VPERM(v8,v0,v1,v16)
  lvx v0,r4,r9
  VPERM(v9,v1,v0,v16)
  addi r4,r4,32
- stvx v8,r0,r3
+ stvx v8,0,r3
  stvx v9,r3,r9
  addi r3,r3,32
 
 10: bf cr7*4+3,11f
- lvx v1,r0,r4
+ lvx v1,0,r4
  VPERM(v8,v0,v1,v16)
  addi r4,r4,16
- stvx v8,r0,r3
+ stvx v8,0,r3
  addi r3,r3,16
 
  /* Up to 15B to go */
diff --git a/arch/powerpc/lib/string_64.S b/arch/powerpc/lib/string_64.S
index d5b4d9498c..56aac4c220 100644
--- a/arch/powerpc/lib/string_64.S
+++ b/arch/powerpc/lib/string_64.S
@@ -184,7 +184,7 @@ err1; std r0,8(r3)
  mtctr r6
  mr r8,r3
 14:
-err1; dcbz r0,r3
+err1; dcbz 0,r3
  add r3,r3,r9
  bdnz 14b
 
--
2.14.0


--
Andreas Schwab, [hidden email]
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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Re: [PATCH] powerpc: fix invalid use of register expressions

Michael Ellerman-2
Andreas Schwab <[hidden email]> writes:

> binutils >= 2.26 now warns about misuse of register expressions in
> assembler operands that are actually literals, for example:
>
> arch/powerpc/kernel/entry_64.S:535: Warning: invalid register expression
>
> Signed-off-by: Andreas Schwab <[hidden email]>
> ---
>  arch/powerpc/include/asm/ppc_asm.h |  2 +-
>  arch/powerpc/kernel/swsusp_asm64.S |  2 +-
>  arch/powerpc/kvm/book3s_64_slb.S   |  2 +-
>  arch/powerpc/lib/copypage_power7.S | 14 ++++----
>  arch/powerpc/lib/copyuser_power7.S | 66 +++++++++++++++++++-------------------
>  arch/powerpc/lib/memcpy_power7.S   | 66 +++++++++++++++++++-------------------
>  arch/powerpc/lib/string_64.S       |  2 +-
>  7 files changed, 77 insertions(+), 77 deletions(-)

Thanks. I updated the change log to mention that it's almost always
s/r0/0/.

And I folded in:

diff --git a/arch/powerpc/purgatory/trampoline.S b/arch/powerpc/purgatory/trampoline.S
index 3696ea6c4826..30277446892c 100644
--- a/arch/powerpc/purgatory/trampoline.S
+++ b/arch/powerpc/purgatory/trampoline.S
@@ -67,7 +67,7 @@ master:
  mr %r16,%r3 /* save dt address in reg16 */
  li %r4,20
  LWZX_BE %r6,%r3,%r4 /* fetch __be32 version number at byte 20 */
- cmpwi %r0,%r6,2 /* v2 or later? */
+ cmpwi %cr0,%r6,2 /* v2 or later? */
  blt 1f
  li %r4,28
  STWX_BE %r17,%r3,%r4 /* Store my cpu as __be32 at byte 28 */

cheers
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Re: powerpc: fix invalid use of register expressions

Michael Ellerman-3
In reply to this post by Andreas Schwab-2
On Sat, 2017-08-05 at 17:55:11 UTC, Andreas Schwab wrote:
> binutils >= 2.26 now warns about misuse of register expressions in
> assembler operands that are actually literals, for example:
>
> arch/powerpc/kernel/entry_64.S:535: Warning: invalid register expression
>
> Signed-off-by: Andreas Schwab <[hidden email]>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/8a583c0a8d316d8ea52ea78491174a

cheers
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Re: [PATCH] powerpc: fix invalid use of register expressions

Andreas Schwab-2
In reply to this post by Michael Ellerman-2
This fixes another invalid use of register expressions.

Signed-off-by: Andreas Schwab <[hidden email]>
---
 arch/powerpc/kernel/l2cr_6xx.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/l2cr_6xx.S b/arch/powerpc/kernel/l2cr_6xx.S
index 97ec8557f9..6408f09dbb 100644
--- a/arch/powerpc/kernel/l2cr_6xx.S
+++ b/arch/powerpc/kernel/l2cr_6xx.S
@@ -181,7 +181,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_SPEC7450)
  mtctr r4
  li r4,0
 1:
- lwzx r0,r0,r4
+ lwzx r0,0,r4
  addi r4,r4,32 /* Go to start of next cache line */
  bdnz 1b
  isync
@@ -328,7 +328,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_L3CR)
  mtctr r4
  li r4,0
 1:
- lwzx r0,r0,r4
+ lwzx r0,0,r4
  dcbf 0,r4
  addi r4,r4,32 /* Go to start of next cache line */
  bdnz 1b
--
2.14.1

--
Andreas Schwab, [hidden email]
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Re: powerpc: fix invalid use of register expressions

Michael Ellerman-3
On Mon, 2017-08-14 at 18:42:43 UTC, Andreas Schwab wrote:
> This fixes another invalid use of register expressions.
>
> Signed-off-by: Andreas Schwab <[hidden email]>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/6c80d3164ece26e55dc2dbfceba948

cheers
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